Updated on 2024/09/25

Information

 

写真a

 
MIKI HAJIME
 
Organization
Faculty of Engineering Department of Earth Resources Engineering Associate Professor
School of Engineering (Concurrent)
Graduate School of Engineering Department of Earth Resources Engineering(Concurrent)
Title
Associate Professor
Contact information
メールアドレス
Tel
0928023349
Profile
mineral processing, hydrometallurgy and electrochemistry of various minerals, especially on copper minerals are investigated for impurity removal and upgrading grade. after ore grinding and classification, flotation experiments are carried out. also concentrate and mineral hydrometallurgy is carried out. these separation and leaching behaviour is investigated with various electrochemical method. for surface analysis such as XPS, XRF, SEM-EDX, MLA, and AFM are also performed. In particular, we have obtained better results on arsenic removal by flotation from arsenic-containing copper concentrates, improvement of chalcopyrite leaching, powder electrochemical methods, etc., which have been considered difficult in the past, and we are studying with the aim of further improvement.
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Degree

  • Ph.D of Engineering

Research History

  • オーストラリア Murdoch大学 博士研究員 チリ Catolica del Norte大学 海外研究員

Research Interests・Research Keywords

  • Research theme:development of technology of hydrometallurgy, flotation, recycling with chemical physics and electrochemistry

    Keyword:Hydrometallurgy, Flotation, Electrochemistry

    Research period: 1996.4 - 2026.3

Awards

  • 論文賞

    2018.3   資源・素材学会  

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    Silicate Covering Layer on Pyrite Surface in the Presence of Silicon-Catechol Complex for Acid Mine Drainage Prevention

Papers

  • Recent innovation for copper processing, hydrometallurgy and its application for Uzbekistan International journal

    HAJIME MIKI

    2023.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Resource engineering education and collaboration in Japan - to develop global leadership International journal

    Hajime Miki

    Kyushu University Forum Kyudai Now, Fostering Academic and Research Collaborations   2023.8

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Technical Development of Arsenic Reduction from Copper Resources by Kyushu University and Sumitomo Metal Mining Co. Ltd. Reviewed International journal

    MIKI Hajime, OKIBE Naoko, SUYANTARA Gde Pandhe Wisnu, OYAMA Keishi, SASAKI Keiko, HIRAJIMA Tsuyoshi, NAKAMURA Takeshi, AOKI Yuji, TANAKA Yoshiyuki, SUWA Takahiro

    Resources Processing   68 ( 3 )   124 - 131   2022.11   ISSN:13486012 eISSN:13499262

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Resources Processing Society of Japan  

    <p>Arsenic removal from copper ores/concentrates is one of the most important issue in mining industries. Under the national project led by JOGMEC, Kyushu University and Sumitomo Metal Mining Co. Ltd. has carried out systematic research on the arsenic removal from copper concentrates, including the heat treatment-magnetic separation, flotation and bioleaching. The flotation studies were carried out mainly on chalcopyrite as a main copper sulfide and enargite as an arsenic containing copper sulfide. Enargite was separated from chalcopyrite by flotation by combining potassium amyl xanthate (PAX) and hydrogen peroxide. The resultant arsenic-rich “dirty” concentrates and/or arsenic-containing copper concentrates were subjected to the magnetic separation as well as bioleaching processes. After the heat treatment, chalcopyrite exhibited magnetic property whereas enargite did not. This difference enabled the magnetic separation of the two minerals. Bioleaching was carried out with the addition of activated carbon to improve the copper dissolution as well as As immobilization.</p>

    DOI: 10.4144/rpsj.68.124

    CiNii Research

  • Investigation of sodium sulfite as a selective depressant in the flotation of chalcopyrite and enargite Reviewed International journal

    G.P.W. SUYANTARA, T. HIRAJIMA, H. MIKI, K. SASAKI, Y.TANAKA, Y. AOKI

    Proc. of 11th Copper2022 International Conference   2022.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Arsenic removal from arsenic containing copper concentrate with heat treatment and magnetic separation Reviewed International journal

    H. MIKI, G.P.W. SUYANTARA, K. SASAKI, T. HIRAJIMA, Y. AOKI, H. FUKUDA

    Proc. of 11th Copper2022 International Conference   2022.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • The estimation of microgram powder electrode system on sulfide mineral oxidation for mineral processing Reviewed International journal

    H. MIKI, H. FUKUDA, G.P.W. SUYANTARA, B. DANIYAROV, T. HIRAJIMA, K. SASAKI

    Proc. of 11th Copper2022 International Conference   2022.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Estimation of Cu and Mo recoveries of five type ores composite in seawater flotation Reviewed International journal

    Y. TANAKA, T. HIRAJIMA, H. MIKI, G.P.W. SUYANTARA

    Proc. of 11th Copper2022 International Conference   2022.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Separation of enargite and chalcocite with H2O2 oxidation treatment using flotation method Reviewed International journal

    B. DANIYAROV, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI, D. OCHI, Y. AOKI

    Proceedings of the 16th International Symposium on East Asian Resources Recycling Technology (EARTH2022)   2022.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • ENHANCED LEACHING OF ARSENIC CONTAINING COPPER SULFIDE WITH SILVER ADDITION IN ACID SOLUTION Reviewed International journal

    Hajime Miki, Akinobu Iguchi, Tsuyoshi Hirajima, Sasaki Keiko

    Proceedings of Copper2016 International Conference   1499 - 1510   2016.11

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    Language:English  

  • Review of three leading program joint fieldwork on 2014 at Beppu geothermal area Reviewed International journal

    Hajime Miki

    87 - 89   2015.11

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    Language:English  

  • Review of three leading program + Texas State University, joint fieldwork on 2015 at Okinoshima island Reviewed International journal

    Hajime Miki

    90 - 92   2015.11

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    Language:English  

  • Study of Silicate Coating on Pyrite Oxidation Suppression: Fundamental Mechanism and Kinetic Analysis Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki

    Proceedings of International Symposium on Earth Science and Technology 2013   189 - 192   2013.12

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    Language:English  

  • Suppression of Pyrite Oxidation by Silicate Coating with Catechol Complex Oxidation Kinetics Estimation with Electrochemistry Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki

    The 12th International Symposium on East Asian Resources Recycling Technology   601 - 604   2013.11

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    Language:English  

  • The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions Reviewed International journal

    Hajime Miki, Michael James Nicol

    Hydrometallurgy 2008, Proceedings of 6th International Symposium   971 - 979   2008.10

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    Language:English  

  • Synergism in the oxidation of covellite and pyrite by iron(III) and copper(II) ions in chloride solutions Reviewed International journal

    Hajime Miki, Michael James Nicol

    Hydrometallurgy 2008, Proceedings of 6th International Symposium   646 - 652   2008.10

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    Language:English  

  • Mechanisms of Catalytic Leaching of Chalcopyrite Reviewed International journal

    Hajime Miki, Naoki Hiroyoshi, Shigeto Kuroiwa, Masami Tsunekawa, Tsuyoshi Hirajima

    Proceedings of 5th Copper2003-Cobre2003 International Conference   6   383 - 394   2003.10

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    Language:English  

  • Batch Leaching Behavior of Chalcopyrite in Acidic Ferric Sulfate Solutions - Relationship between Solution Redox Potential and Copper Extraction - Reviewed

    Hajime Miki, Naoki Hiroyoshi, Tsuyoshi Hirajima, Masami Tsunekawa

    Journal of MMIJ   117   215 - 220   2001.3

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    Language:Japanese  

  • Effect of oxidation treatment on the selective separation of molybdenite from chalcocite using flotation Reviewed International journal

    Berdakh Daniyarov, Miki Hajime, Suyantara Gde Pandhe Wisnu, Hirajima Tsuyoshi, Sasaki Keiko, Nakao Ryota, Ochi Daishi, Aoki Yuji

    Powder Technology   431   119078   2024.1   ISSN:0032-5910 eISSN:1873-328X

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.powtec.2023.119078

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  • Selective Flotation of Copper Concentrates Containing Arsenic Minerals Using Potassium Amyl Xanthate and Oxidation Treatment Reviewed International journal

    Suyantara Gde Pandhe Wisnu, Miki Hajime, Hirajima Tsuyoshi, Sasaki Keiko, Ochi Daishi, Aoki Yuji

    Materials Transactions   65 ( 1 )   27 - 36   2024.1   ISSN:13459678 eISSN:13475320

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    <p>This study investigated the effects of potassium amyl xanthate (KAX) and oxidation treatment using hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) on the selective flotation of copper concentrates containing arsenic-bearing copper minerals. The mineralogical analysis revealed that enargite and chalcopyrite were the main arsenic-bearing copper and copper sulfide minerals, respectively, in the copper concentrate. KAX treatment at pH 9 improved the recoveries of copper sulfide and arsenic-bearing copper minerals. However, arsenic-bearing copper minerals floated more rapidly than copper sulfide minerals, indicating better separation selectivity. The separation selectivity of the KAX treatment was significantly improved at pH 10. H<sub>2</sub>O<sub>2</sub> treatment was found to selectively improve the recovery of arsenic-bearing copper minerals. A combination treatment using 0.1 M H<sub>2</sub>O<sub>2</sub> and 60 g/t of KAX at pH 9 enhanced the separation selectivity in the selective flotation of copper sulfide and arsenic-bearing copper minerals by producing a copper concentrate with the lowest arsenic grade and highest copper grade in tailings compared to those obtained from separated KAX and H<sub>2</sub>O<sub>2</sub> treatments.</p>

    DOI: 10.2320/matertrans.M-M2023811

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    CiNii Research

  • Selective flotation of molybdenite and chalcocite using hydrogen peroxide International journal

    Daniyarov Berdakh, Hajime Miki, Gde Pandhe Wisnu Suyantara, Kadirova Zukhra, Akhmadjonov Oybek, Ziyatov Daminbek, Daminova Shakhlo

    2023.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Sodium metabisulfite as a copper depressant in the selective flotation of copper-molybdenum concentrate using seawater Reviewed International journal

    Berdakh Daniyarov, Miki Hajime, Suyantara Gde Pandhe Wisnu, Hirajima Tsuyoshi, Sasaki Keiko, Nakao Ryota, Ochi Daishi, Aoki Yuji, Akbarshokh Ulmaszoda, Kumika Ura

    Advanced Powder Technology   34 ( 12 )   104258   2023.12   ISSN:0921-8831 eISSN:1568-5527

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.apt.2023.104258

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  • Evaluation of micro powder electrode on sulfide mineral leaching for hydrometallurgical process Reviewed International journal

    HAJIME MIKI, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Study on the Effect of Iron Oxide-Hydroxide Nanoparticles on Mixed Flotation of Bornite and Molybdenite Reviewed International journal

    Kazuto Satomura, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • The Effect Of Various Reagents On Selective Flotation Of Molybdenite And Chalcocite Reviewed International journal

    Ryota Nakao, Hajime Miki, Eska Putra Dwitama, Keiko Sasaki, Daishi Ochi, Yuji Aoki, Gde Pandhe Wisnu Suyantara

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Investigation of Chalcopyrite Floatability in the Presence of Goethite Nanoparticles Reviewed International journal

    Akbarshokh Ulmaszoda, Gde Pandhe Wisnu Suyantara, Intan Nurul Rizki, Keiko Sasaki, Hajime Miki

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Utilizing Oxidation Treatment for Arsenic Mineral Removal in Producing a Cleaner Copper Concentrate using Flotation Reviewed International journal

    Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Yuji Aoki, Daishi Ochi, Tsuyoshi Hirajima

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Arsenic removal with heat treatment - magnetic separation from dirty copper conc Reviewed International journal

    HAJIME MIKI, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Preliminary Evaluation of the Impact of Nanoparticles on Enargite Flotation Reviewed International journal

    Eska Putra Dwitama, Akbarshokh Ulmaszoda, Gde Pandhe Wisnu Suyantara, Keiko Sasaki, Hajime Miki

    The 18th International Conference on Quality in Research   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Effect of goethite (α-FeOOH) nanoparticles on the surface properties and flotation behavior of chalcopyrite Reviewed International journal

    Suyantara, GPW; Rizki, IN; Ulmaszoda, A; Miki, H; Sasaki, K

    JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING   11 ( 3 )   110006   2023.6   ISSN:2213-2929 eISSN:2213-3437

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Environmental Chemical Engineering  

    Chalcopyrite flotation is selectively depressed by oxidation treatment. The presence of ferric oxyhydroxide on the surface of chalcopyrite after oxidation treatment is a key factor in depressing chalcopyrite flotation. However, there is no concrete evidence that ferric oxyhydroxide has a depressing effect. In addition, the effectiveness of this depressing effect could be enhanced by directly applying ferric oxyhydroxide nanoparticles. This study investigated the effect of goethite (α-FeOOH) nanoparticles on the surface properties and flotation behavior of chalcopyrite. α-FeOOH nanoparticles were produced through chemical precipitation followed by hydrothermal treatment. The crystalline structure of irregular rice grain-shaped α-FeOOH nanoparticles was confirmed by the X-ray diffraction pattern and scanning electron microscope image. Micro-flotation experiments showed that chalcopyrite recovery decreased significantly from 93 % to 13 % when 30 mg/L α-FeOOH nanoparticles was used. This flotation result demonstrated the potential of α-FeOOH nanoparticles as a nanodepressant for the flotation of chalcopyrite. These nanoparticles physically adsorbed on the chalcopyrite surface and rendered its surface hydrophilic, thereby reducing the chalcopyrite flotation recovery. The attractive electrostatic force between the positively charged α-FeOOH nanoparticles and the negatively charged chalcopyrite surface is likely responsible for the adsorption of α-FeOOH nanoparticles on chalcopyrite.

    DOI: 10.1016/j.jece.2023.110006

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  • Significance of Fe contents on the surface of the gold ores in gold leaching by thiourea and ethylene thiourea Reviewed International journal

    K. SASAKI, I. SUYAMA, Y. AOKI, K.T.KONADU, CINDY, C. CHUAICHAM, H. MIKI, T. HIRAJIMA

    Minerals Engineering   191   107957   2023.6

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Effect of pH and Precipitations on Copper-Molybdenum Rougher Flotation in Seawater Reviewed International journal

    Tanaka Yoshiyuki, Miki Hajime, Suyantara Gde Pandhe Wisnu, Aoki Yuji, Okamoto Hideyuki, Ura Kumika, Hirajima Tsuyoshi

    Materials Transactions   64 ( 6 )   1125 - 1231   2023.6   ISSN:13459678 eISSN:13475320

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    <p>Effect of pH and precipitations on copper–molybdenum ore rougher flotation has been investigated in seawater with flotation experiments followed by precipitation estimation with thermodynamic calculations, turbidity measurements and XRD analysis. Results of flotation experiments in seawater indicated that the effect of pH on copper and molybdenum flotation maximum recovery seems limited. On the other hand, pH drastically influences copper and molybdenum flotation kinetic constant, it decreased a lot with increasing pH, and results of pH 8.5 and 9.0 is quite similar. From thermodynamic calculation, precipitation effect on seawater less than pH 9 seems limited since CaCO<sub>3</sub> and Mg(OH)<sub>2</sub> does not exist on this pH region. To estimate precipitation on pH in seawater, turbidity measurements were carried out with controlled pH and results indicated even pH is less than 9, noticeable turbidity can be seen. To confirm precipitation in seawater, precipitation was collected from controlled pH seawater solution. XRD analysis of precipitation indicated that obtained precipitation at pH 8.7 is CaCO<sub>3</sub>, CaSO<sub>4</sub> and Mg(OH)<sub>2</sub>. This result is not same as the result of thermodynamic calculation and it might be due to the activity coefficient and ionic strength effect. Although flotation kinetic is influenced with turbidity, turbidity influence on maximum recovery is limited. Effect of kinetic might be due to that precipitation exist as suspension and it prevent bubble and mineral attachments. Small effect of precipitation on maximum recovery might be due to exist of few precipitation on the surface of copper and molybdenum mineral since most of mineral in rougher flotation is gangue minerals and also most of precipitations might be on gangue minerals. These results indicated that seawater flotation have to take into account of precipitation effect more for flotation kinetic than maximum flotation recovery.</p>

    DOI: 10.2320/matertrans.M-M2023805

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  • Effect of hydrogen peroxide on selective flotation of chalcocite and enargite Reviewed International journal

    G.P.W.SUYANTARA, B.DANIYAROV, H.MIKI, H.TSUYOSHI, K.SASAKI, D.OCHI, Y.AOKI

    International Journal of Mining Science and Technology   33 ( 6 )   703   2023.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ijmst.2023.01.002

  • Effect of hydrogen peroxide on selective flotation of chalcocite and enargite Reviewed International journal

    International Journal of Mining Science and Technology   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ijmst.2023.01.002

  • The Effect of Microwave Pre-treatment on the Magnetic Properties of Enargite and Tennantite and Their Separation from Chalcopyrite Reviewed International journal

    Minerals   13 ( 3 )   2023.3   eISSN:2075-163X

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/min13030334

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  • Significance of Fe contents on the surface of the gold ores in gold leaching by thiourea and ethylene thiourea

    Sasaki, K; Suyama, I; Aoki, Y; Konadu, KT; Chuaicham, C; Miki, H; Hirajima, T; Hirajima, T

    MINERALS ENGINEERING   191   2023.1   ISSN:0892-6875

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    Publisher:Minerals Engineering  

    Environmentally friendly ligands, alternatives to cyanide, are desired to extract gold for the sustainable hydrometallurgy of gold. Leaching characteristics of gold were examined using thiourea (TU) and ethylene thiourea (ETU) as ligands from three types of gold ores with different Fe contents from 2.70 to 14.09 wt% under the acidic condition. The Au recovery by TU leaching reached the extractable maximum with the lowest Fe-bearing gold ore. This type of gold ore is suitable for TU/ETU leaching. The highest Fe-bearing gold ore was the most difficult to extract Au in ETU/TU leaching. There are at least two detrimental factors in TU leaching of Fe-rich gold ores, that is (i) the oxidative decomposition of TU, and (ii) complexation of TU with Fe3+, which both cause to deduce the complexation of TU with Au+. However, adding Na2SO3 improved the Au extraction from such an ore to reduce Fe3+ to Fe2+. ETU facilitated the formation of more stable complexes with Au than TU against the coexisting Fe3+. This finding is useful when considering the cyanide-free leaching of different types of gold ores.

    DOI: 10.1016/j.mineng.2022.107957

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  • Study on the effect of sodium metabisulfite on selective flotation of chalcopyrite and molybdenite with seawater Reviewed International journal

    R. OGI, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI Y. AOKI, D. OCHI

    Proc. of International Symposium on Earth Science and Technology 2022   2022.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Separation of enargite and chalcocite with H2O2 oxidation treatment using flotation method Reviewed International journal

    B. DANIYAROV, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI D. OCHI, Y. AOKI

    Proc. of International Symposium on Earth Science and Technology 2022   2022.12

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  • Effect of sodium metabisulfite and slaked lime on the floatability and surface properties of chalcopyrite Reviewed International journal

    Suyantara Gde Pandhe Wisnu, Semoto Yuki, Miki Hajime, Hirajima Tsuyoshi, Sasaki Keiko, Ochi Daishi, Aoki Yuji, Berdakh Daniyarov, Ura Kumika

    Powder Technology   408   117750   2022.8   ISSN:0032-5910 eISSN:1873-328X

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.powtec.2022.117750

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  • Effect of Sodium Metabisulfite on Selective Flotation of Chalcopyrite and Molybdenite Reviewed International journal

    Minerals   1377 - 1390   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/min11121377

  • Effect of Na2SO3 on the floatability of chalcopyrite and enargite Reviewed International journal

    Minerals Engineering   173   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.mineng.2021.107222

  • The study of selective flotation separation of copper-molybdenite with seawater Reviewed International journal

    Proceedings of International Symposium on Earth Science and Technology 2020   2020.12

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Selective flotation for removal of impurities on copper concentrates with various redox reactions Reviewed International journal

    Proceedings of IMPC 2020:XXX International Mineral Processing Congress   2020.11

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • The study of selective flotation separation of copper-molybdenite with seawater Reviewed International journal

    Proceedings of International Symposium on Earth Science and Technology 2020   2020.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Effect of a sulfite reagent on floatability of chalcopyrite and enargite Reviewed International journal

    Proceedings of IMPC 2020:XXX International Mineral Processing Congress   2020.11

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Effect of seawater and process water on copper-molybdenum rougher flotation in batch and pilot test Reviewed International journal

    Proceedings of IMPC 2020:XXX International Mineral Processing Congress   2020.11

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Bubble interactions with chalcopyrite and molybdenite surfaces in seawater Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Minerals Engineering   157   106536 - 106536   2020.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.mineng.2020.106536

  • Catalytic mechanism of activated carbon-assisted bioleaching of enargite concentrate Reviewed

    Keishi Oyama, Kazuhiko Shimada, Junichiro Ishibashi, Keiko Sasaki, Hajime Miki, Naoko Okibe

    Hydrometallurgy   196   2020.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.hydromet.2020.105417

    Repository Public URL: http://hdl.handle.net/2324/4737402

  • Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore Reviewed

    Kojo T. Konadu, Ryotaro Sakai, Diego M. Mendoza, Chitiphon Chuaicham, Hajime Miki, Keiko Sasaki

    Hydrometallurgy   195   105363 - 105363   2020.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.hydromet.2020.105363

  • Effect of H2O2 and potassium amyl xanthate on separation of enargite and tennantite from chalcopyrite and bornite using flotation Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki

    Minerals Engineering   152   106371 - 106371   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.mineng.2020.106371

  • Study of selective flotation of copper sulfide and As containing copper minerals Reviewed International journal

    Yuta Orii, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Tsuyoshi Hirajima, Shigeto Kuroiwa, Yuji Aoki

    Proceedings of International Symposium on Earth Science and Technology 2019   2019.12

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Effect of hydrogen peroxide on the separation of copper sulfide minerals and arsenic-bearing copper minerals using flotation Reviewed International journal

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki

    Proceedings of Flotation'19 International Conference   2019.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Effect of seawater on bubble interactions with chalcopyrite and molybdenite surfaces Reviewed International journal

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki

    Proceedings of Flotation'19 International Conference   2019.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Separation of molybdenite and chalcopyrite using various oxidation treatments Reviewed International journal

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Mitsuru Sawada

    Proceedings of 10th Copper International Conference   2019.8

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Selective Flotation on Chalcopyrite and Molybdenite with Various Redox Reactions Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    Proceedings of The 15th Internatonal Symposium on East Asian Resources Recycling Technology   2019.8

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Effect of Heating Treatment on Magnetic Properties Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    Proceedings of 10th Copper International Conference   2019.8

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  • Investigation of reagents for selective flotation on chalcopyrite and molybdenite

    H. Miki, Tsuyoshi Hirajima, Y. Muta, G. P.W. Suyantara, K. Sasaki

    29th International Mineral Processing Congress, IMPC 2018 IMPC 2018 - 29th International Mineral Processing Congress   1854 - 1861   2019.1

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  • The use of Fenton's reagent on selective flotation of chalcopyrite and molybdenite

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    29th International Mineral Processing Congress, IMPC 2018 IMPC 2018 - 29th International Mineral Processing Congress   1862 - 1871   2019.1

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  • Evaluation of Catalytic Effect of Activated Carbon on Enargite Bioleaching Reviewed International journal

    Proceedings of International Symposium on Earth Science and Technology 2018   2018.11

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  • Carbon-assisted bioleaching of chalcopyrite concentrate Reviewed International journal

    Proceedings of International Symposium on Earth Science and Technology 2018   2018.11

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  • Effect of Fenton-like oxidation reagent on hydrophobicity and floatability of chalcopyrite and molybdenite Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   554   34 - 48   2018.10

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    DOI: 10.1016/j.colsurfa.2018.06.029

  • Investigation of reagents for selective flotation on chalcopyrite and molybdenite Reviewed International journal

    Proceedings of XXIV International Mineral Processing Congress (IMPC 2018)   2018.7

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  • The use of Fenton’s reagent on selective flotation of chalcopyrite and molybdenite Reviewed International journal

    Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Miki Hajime、Sasaki Keiko

    2018.7

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  • Selective flotation of chalcopyrite and molybdenite using H2O2 oxidation method with the addition of ferrous sulfate Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi

    Minerals Engineering   122   312 - 326   2018.6

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    DOI: 10.1016/j.mineng.2018.02.005

  • Silver-catalyzed bioleaching of enargite concentrate using moderately thermophilic microorganisms Reviewed

    Keishi Oyama, Kazuhiko Shimada, Junichiro Ishibashi, Hajime Miki, Naoko Okibe

    Hydrometallurgy   177   197 - 204   2018.5

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    DOI: 10.1016/j.hydromet.2018.03.014

    Repository Public URL: http://hdl.handle.net/2324/4737398

  • Microbiological Redox Potential Control to Improve the Efficiency of Chalcopyrite Bioleaching Reviewed

    Yusei Masaki, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Naoko Okibe

    Geomicrobiology Journal   35 ( 8 )   1 - 9   2018.4

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    DOI: 10.1080/01490451.2018.1443170

    Repository Public URL: http://hdl.handle.net/2324/4737396

  • Effect of sodium sulfite on floatability of chalcopyrite and molybdenite Reviewed

    Hajime Miki, Tsuyoshi Hirajima, Yukihiro Muta, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    Minerals   8 ( 4 )   2018.4

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    DOI: 10.3390/min8040172

  • Floatability of molybdenite and chalcopyrite in artificial seawater Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Minerals Engineering   115   117 - 130   2018.1

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    DOI: 10.1016/j.mineng.2017.10.004

  • Mechanism of Silver-Catalyzed Bioleaching of Enargite Concentrate Invited Reviewed International journal

    Keishi Oyama, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Naoko Okibe

    Solid State Phenomena   262   273 - 276   2017.10

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    Mechanism of Silver-Catalyzed Bioleaching of Enargite Concentrate

    DOI: 10.4028/www.scientific.net/SSP.262.273

    Other Link: 10.4028/www.scientific.net/SSP.262.273

  • Development of alternative additive of NaHS for selective flotation of chalcopyrite and molybdenite Reviewed International journal

    Tsuyoshi Hirajima, Hajime Miki, Yukihiro Muta, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    Proceedings of Flotation'17   2017.10

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    Development of alternative additive of NaHS for selective flotation of chalcopyrite and molybdenite

  • Study on the effect of a mixture of hydrogen peroxide and ferrous sulfate on the floatability of chalcopyrite and molybdenite Reviewed International journal

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Proceedings of Flotation'17   2017.10

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    Study on the effect of a mixture of hydrogen peroxide and ferrous sulfate on the floatability of chalcopyrite and molybdenite

  • The anodic behaviour of chalcopyrite in chloride solutions Voltammetry Reviewed

    Michael Nicol, Hajime Miki, Suchun Zhang

    Hydrometallurgy   171   198 - 205   2017.8

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    DOI: 10.1016/j.hydromet.2017.05.016

  • Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation Reviewed

    Hajime Miki, Hidekazu Matsuoka, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    Materials Transactions   58 ( 5 )   761 - 767   2017.3

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    DOI: 10.2320/matertrans.M-M2017807

  • Selective flotation of chalcopyrite and molybdenite with H2O2 oxidation Reviewed

    Tsuyoshi Hirajima, Hajime Miki, Gde Pandhe Wisnu Suyantara, Hidekazu Matsuoka, Ahmed Mohamed Elmahdy, Keiko Sasaki, Yuji Imaizumi, Shigeto Kuroiwa

    Minerals Engineering   100   83 - 92   2017.1

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    DOI: 10.1016/j.mineng.2016.10.007

  • The development of fine microgram powder electrode system and its application in the analysis of chalcopyrite leaching behavior Reviewed

    Hajime Miki, Tsuyoshi Hirajima, Kazunori Oka, Keiko Sasaki

    Minerals   6 ( 4 )   2016.12

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    DOI: 10.3390/min6040103

  • Three leading program joint field work Reviewed

    Hajime Miki

    Evergreen   3 ( 2 )   68 - 69   2016.12

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  • The Effect of Microbiological Redox Potential Control on Cu Extraction in the Chalcopyrite Bioleaching System International journal

    Yusei Masaki, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proc. of International Symposium on Earth Science and Technology 2016   2016.11

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  • CHALCOPYRITE BIOLEACHING WITH REDOX POTENTIAL CONTROL Reviewed International journal

    Yusei Masaki, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proceedings of Copper2016 International Conference   1724 - 1728   2016.11

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  • SELECTIVE BIOLEACHING OF ENARGITE (Cu3AsS4) OVER PYRITE (FeS2) FOR COPPER RECOVERY Reviewed International journal

    Keishi Oyama, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proceedings of Copper2016 International Conference   1719 - 1723   2016.11

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  • APPLICATION OF OXIDATIVE TREATMENT ON SELECTIVE FLOTATION OF MOLYBDENITE AND CHALCOPYRITE Reviewed International journal

    Tsuyoshi Hirajima, Hidekazu Matsuoka, Hajime Miki, Sasaki Keiko, Yuji Imaizumi

    Proceedings of Copper2016 International Conference   182 - 193   2016.11

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  • FLOATABILITY OF CHALCOPYRITE AND MOLYBDENITE IN MgCl2 SOLUTION Reviewed International journal

    Tsuyoshi Hirajima, Osamu Ichikawa, Hajime Miki, Sasaki Keiko, Gde Pandhe Wisnu Swantara, Ahmed Mohammed Elmardy

    Proceedings of Copper2016 International Conference   173 - 181   2016.11

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  • BUBBLE COLLISION AND ATTACHMENT ON CHALCOPYRITE AND MOLYBDENITE SURFACES Reviewed International journal

    Gde Pandhe Wisnu Swantara, Tsuyoshi Hirajima, Osamu Ichikawa, Hajime Miki, Sasaki Keiko, Ahmed Mohammed Elmardy

    Proceedings of Copper2016 International Conference   162 - 172   2016.11

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  • Microwave and Furnace Treatment of Sulfide Minerals International journal

    Taigen Masuyama, Tsuyoshi Hirajima, Hajime Miki, Gde Pandhe Wisnu Swantara, Ahmed Mohammed Elmardy, Sasaki Keiko

    Proc. of International Symposium on Earth Science and Technology 2016   2016.11

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  • Investigating Catalytic Effect of Silver on Bioleaching of Enargite Concentrate International journal

    Keishi Oyama, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proc. of International Symposium on Earth Science and Technology 2016   2016.11

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  • Effect of Mg2+ and Ca2+ as divalent seawater cations on the floatability of molybdenite and chalcopyrite Invited Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima

    MINERALS ENGINEERING   96-97   83 - 93   2016.10

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    DOI: 10.1016/j.mineng.2016.06.023

  • Effect of Kerosene on Bubble Interaction with Molybdenite and Chalcopyrite in MgCl2 Solution Reviewed International journal

    Gde Pandhe Wisnu Swantara, Tsuyoshi Hirajima, Ahmed Mohammed Elmardy, Hajime Miki, Sasaki Keiko

    Proceedings of IMPC 2016: XXVIII International Mineral Processing Congress   2016.9

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  • Comparison of Selective Flotation of Chalcopyrite and Molybdenite with Various Oxidation Techniques Reviewed International journal

    Tsuyoshi Hirajima, Hidekazu Matsuoka, Hajime Miki, Gde Pandhe Wisnu Swantara, Ahmed Mohammed Elmardy, Sasaki Keiko

    Proceedings of IMPC 2016: XXVIII International Mineral Processing Congress   2016.9

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  • Effect of kerosene emulsion in MgCl2 solution on the kinetics of bubble interactions with molybdenite and chalcopyrite Reviewed

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Ahmed Mohamed Elmahdy, Hajime Miki, Keiko Sasaki

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   501   98 - 113   2016.7

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    DOI: 10.1016/j.colsurfa.2016.04.039

  • Catalytic effect of silver on arsenic-containing copper sulfide dissolution in acidic solution Reviewed

    Hajime Miki, Akinobu Iguchi, Tsuyoshi Hirajima, Keiko Sasaki

    Hydrometallurgy   162   1 - 8   2016.6

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    DOI: 10.1016/j.hydromet.2016.02.007

  • Removal mechanism of high concentration borate by co-precipitation with hydroxyapatite Reviewed

    Keiko Sasaki, Kenta Toshiyuki, Keiko Ideta, Hajime Miki, Tsuyoshi Hirajima, Jin Miyawaki, Mitsuhiro Murayama, Ismaila Dabo

    Journal of Environmental Chemical Engineering   4 ( 1 )   1092 - 1101   2016.3

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    DOI: 10.1016/j.jece.2016.01.012

  • Removal mechanism of high concentration borate by co-precipitation with hydroxyapatite Invited Reviewed International journal

    Hajime Miki, Sasaki Keiko, Tsuyoshi Hirajima

    Journal of Environmental Chemical Engineering   4 ( 1 )   1092 - 1101   2016.1

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    DOI: 10.1016/j.jece.2016.01.012

  • Effect of kerosene on bubble interaction with molybdenite and chalcopyrite in MgCl2 solution

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, A. M. Elmahdy, Hajime Miki, Keiko Sasaki

    28th International Mineral Processing Congress, IMPC 2016 IMPC 2016 - 28th International Mineral Processing Congress   2016.1

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  • Comparison of selective flotation of chalcopyrite and molybdenite with various oxidation techniques

    Tsuyoshi Hirajima, Hidekazu Matsuoka, Hajime Miki, Gde Pandhe Wisnu Suyantara, Ahmed Mohamed Elmahdy, Keiko Sasaki

    28th International Mineral Processing Congress, IMPC 2016 IMPC 2016 - 28th International Mineral Processing Congress   2016.1

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  • Effect of Mg2+ and Ca2+ as divalent seawater cations on the floatability of molybdenite and chalcopyrite Reviewed

    Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Osamu Ichikawa, Ahmed Mohamed Elmahdy, Hajime Miki, Keiko Sasaki

    Minerals Engineering   96-97   83 - 93   2016.1

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    DOI: 10.1016/j.mineng.2016.06.023

  • Suppression of pyrite oxidation in acid mine drainage by carrier microencapsulation using liquid product of hydrothermal treatment of low-rank coal, and electrochemical behavior of resultant encapsulating coatings Reviewed

    Mutia Dewi Yuniati, Keitaro Kitagawa, Tsuyoshi Hirajima, Hajime Miki, Naoko Okibe, Keiko Sasaki

    Hydrometallurgy   158   83 - 93   2015.12

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    DOI: 10.1016/j.hydromet.2015.09.028

  • Study of selective flotation of chalcopyrite and molybdenite with various oxidation techniques Reviewed International journal

    Tsuyoshi Hirajima, Hidekazu Matsuoka, Hajime Miki, Ahmed Mohammed Elmardy, Sasaki Keiko

    Proceedings of Flotation'15   2015.11

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  • Selective bioleaching of enargite (Cu3AsS4) over pyrite (FeS2) for Cu recovery International journal

    Keishi Oyama, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proc. of International Symposium on Earth Science and Technology 2015   191 - 192   2015.11

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  • Bioleaching of Highly Refractory Chalcopyrite in The Presence of Silver Catalyst International journal

    Yusei Masaki, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    Proc. of International Symposium on Earth Science and Technology 2015   189 - 190   2015.11

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  • Various surface treatment of molybdenite and chalcopyrite International journal

    Hajime Miki, Sasaki Keiko, Tsuyoshi Hirajima, Hidekazu Matsuoka

    Proc. of International Symposium on Earth Science and Technology 2015   92 - 94   2015.11

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  • Effect of silver addition in potential controlled solution on dissolution rate of enargite International journal

    Akinobu Iguchi, Hajime Miki, Tsuyoshi Hirajima, Sasaki Keiko

    Proc. of International Symposium on Earth Science and Technology 2015   85 - 97   2015.11

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  • Seawater divalent cations (MgCl2 and CaCl2) effect on the flotation of molybdenite and chalcopyrite Reviewed International journal

    Tsuyoshi Hirajima, Osamu Ichikawa, Gde Pandhe Wisnu Suyantara, Hajime Miki, Sasaki Keiko

    Proceedings of Flotation'15   2015.11

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  • Silicate covering layer on pyrite surface in the presence of siliconcatechol complex for acid mine drainage prevention Reviewed

    Mutia Dewi Yuniati, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Materials Transactions   56 ( 10 )   1733 - 1741   2015.10

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    DOI: 10.2320/matertrans.M-M2015821

  • Silica Covering Layer on the Chalcopyrite Surface: Electrochemical Behaviors and Depression Effect on Copper-Molybdenum Flotation Reviewed International journal

    Mutia Dewi Yuniati, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Proceedings of International Symposium on Earth Science and Technology 2014   108 - 111   2014.12

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  • The Effect of Solution Potential and Silver Ion Addition on Dissolution Rate of Enargite Reviewed International journal

    Akinobu Iguchi, Hajime Miki, Tsuyoshi Hirajima, Keiko Sasaki, Mitsuru Sawada

    Proceedings of International Symposium on Earth Science and Technology 2014   322 - 323   2014.12

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  • Electrochemical Treatment of Molybdenite and Chalcopyrite Reviewed International journal

    Hidekazu Matsuoka, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of International Symposium on Earth Science and Technology 2014   320 - 321   2014.12

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  • Selective Flotation of Chalcopyrite and Molybdenite by surface oxidation Reviewed International journal

    Tsuyoshi Hirajima, Masanori Mori, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of International Mineral Processing Congress (IMPC2014)   202 - 212   2014.11

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  • Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment Reviewed International journal

    Hajime Miki, Sasaki Keiko, Tsuyoshi Hirajima, Osamu Ichikawa, Masanori Mori

    MINERALS ENGINEERING   66-68   102 - 111   2014.11

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    DOI: 10.1016/j.mineng.2014.07.011

  • Suppression of pyrite and arsenopyrite oxidation by silica coating: Electrochemical aspects and the mechanism Reviewed International journal

    Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki

    Proceedings of International Mineral Processing Congress (IMPC2014)   101 - 110   2014.11

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  • Recovery of Furfural Produced by Hydrothermal Treatment with Biomass Charcoal Reviewed International journal

    Hisaya Tsuji, Pilasinee Limsuwan, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Satoshi Kumagai

    International Journal of Environment   4 ( 1 )   11 - 17   2014.6

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  • Silica and sodium chloride assisted leaching of chalcopyrite Reviewed International journal

    Hajime Miki, Gamni Senanayake, Sophie Wheatley

    Proceeding of Hydrometallurgy 2014   1   211 - 224   2014.6

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  • XPS and AFM Analysis of Plasma Oxidized Chalcopyrite and Molybdenite for New Selective Flotation Technique International journal

    Osamu Ichikawa, Tsuyoshi Hirajima, Masanori Mori, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of International Conference on Biological, Civil and Environmental Engineering (BCEE-2014)   2014.3

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  • Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment Reviewed

    Tsuyoshi Hirajima, Masanori Mori, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mohsen Farahat, Mitsuru Sawada

    Minerals Engineering   66   102 - 111   2014.1

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    DOI: 10.1016/j.mineng.2014.07.011

  • Electrochemical Study of Silicate Coating on Sulphide Minerals Oxidation Suppression Reviewed International journal

    Mutia Dewi Yuniati, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    Proceedings of International Symposium on Earth Science and Technology 2013   193 - 196   2013.12

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  • Surfaces Characterization of Plasma Treated Chalcopyrite and Molybdenite Reviewed International journal

    Osamu Ichikawa, Tsuyoshi Hirajima, Masanori Mori, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of International Symposium on Earth Science and Technology 2013   376 - 379   2013.12

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  • Floatability Modification of Chalcopyrite and Molybdenite with Plasma Treatment Reviewed International journal

    Masanori Mori, Tsuyoshi Hirajima, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of International Symposium on Earth Science and Technology 2013   372 - 375   2013.12

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  • Selective Flotation of Chalcopyrite and Molybdenite with Plasma Pre-treatment Reviewed International journal

    Tsuyoshi Hirajima, Masanori Mori, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Proceedings of Flotation '13   2013.11

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  • Hydrothermal Treatment of Coconut Shell and Recovery of Furfural Reviewed International journal

    Hisaya Tsuji, Satoshi Kumagai, Pilasnee Limsuwan, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki

    Proceedings of International Conference on Green Energy and Technology   172 - 175   2013.8

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  • The effects of sulphate ions and temperature on the leaching of pyrite. 2. Dissolution rates Reviewed

    Michael Nicol, Hajime Miki, Petrus Basson

    Hydrometallurgy   133   182 - 187   2013.2

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    DOI: 10.1016/j.hydromet.2013.01.009

  • The effects of sulphate ions and temperature on the leaching of pyrite. 1. Electrochemistry Reviewed

    Michael J. Nicol, Hajime Miki, Suchun Zhang, Petrus Basson

    Hydrometallurgy   133   188 - 196   2013.1

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    DOI: 10.1016/j.hydromet.2013.01.010

  • The Development of Heap Leaching Based on Chloride for Primary and Secondary Copper Minerals Reviewed International journal

    Michael James Nicol, Hajime Miki, Derick Rautenbach, Lilian Velasquez, C Buuren

    Proceedings of Percolation Leaching: The status globally and in Southern Africa 2011   5   2011.6

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  • The dissolution of chalcopyrite in chloride solutions. IV. the kinetics of the auto-oxidation of copper(I) Reviewed

    Hajime Miki, Michael Nicol

    Hydrometallurgy   105 ( 3-4 )   246 - 250   2011.1

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    DOI: 10.1016/j.hydromet.2010.10.009

  • The kinetics of dissolution of synthetic covellite, chalcocite and digenite in dilute chloride solutions at ambient temperatures Reviewed

    Hydrometallurgy   105 ( 3-4 )   321 - 327   2011.1

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    DOI: 10.1016/j.hydromet.2010.11.004

  • Enhanced Leaching of Chalcopyrite at Low Potentials in Chloride Solutions. 2. Mechanism Reviewed International journal

    Petrus Basson, Hajime Miki, Michael James Nicol, Lilian Velasquez

    Proceedings of 7th Copper2010 International Conference   5   1753 - 1770   2010.6

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  • The dissolution of chalcopyrite in chloride solutions Part 3. Mechanisms Reviewed

    Hydrometallurgy   103 ( 1-4 )   86 - 95   2010.6

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    DOI: 10.1016/j.hydromet.2010.03.003

  • The dissolution of chalcopyrite in chloride solutions Part 2: Effect of various parameters on the rate Reviewed

    Hydrometallurgy   103 ( 1-4 )   80 - 85   2010.6

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    DOI: 10.1016/j.hydromet.2010.03.004

  • The dissolution of chalcopyrite in chloride solutions Part 1. the effect of solution potential Reviewed

    Hydrometallurgy   103 ( 1-4 )   108 - 113   2010.6

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    DOI: 10.1016/j.hydromet.2010.03.001

  • Enhanced Leaching of Chalcopyrite at Low Potentials in Chloride Solutions. 1. Concentrates Reviewed International journal

    Petrus Basson, Hajime Miki, Michael James Nicol, Lilian Velasquez

    Proceedings of 7th Copper2010 International Conference   5   1737 - 1752   2010.6

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  • The kinetics of the oxidation of iron(II) by chlorate in the leaching of uranium ores Reviewed

    Hajime Miki, Michael Nicol

    Hydrometallurgy   100 ( 1-2 )   47 - 49   2009.1

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    DOI: 10.1016/j.hydromet.2009.10.001

  • Effects of coexisting metal ions on the redox potential dependence of chalcopyrite leaching in sulfuric acid solutions Reviewed

    N. Hiroyoshi, S. Kuroiwa, Hajime Miki, M. Tsunekawa, Tsuyoshi Hirajima

    Hydrometallurgy   87 ( 1-2 )   1 - 10   2007.6

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    DOI: 10.1016/j.hydromet.2006.07.006

  • Applications of the Electrochemistry of Fine Mineral Sulfides Reviewed International journal

    Michael James Nicol, Hajime Miki

    Innovations in Natural Resource Processing, Proceedings of the Jan D. Miller Symposium   1   179 - 192   2005.2

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  • Synergistic effect of cupric and ferrous ions on active-passive behavior in anodic dissolution of chalcopyrite in sulfuric acid solutions Reviewed

    Naoki Hiroyoshi, Shigeto Kuroiwa, Hajime Miki, Masami Tsunekawa, Tsuyoshi Hirajima

    Hydrometallurgy   74 ( 1-2 )   103 - 116   2004.8

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    DOI: 10.1016/j.hydromet.2004.01.003

  • A new reaction model for the catalytic effect of silver ions on chalcopyrite leaching in sulfuric acid solutions Reviewed

    Naoki Hiroyoshi, Masatoshi Arai, Hajime Miki, Masami Tsunekawa, Tsuyoshi Hirajima

    Hydrometallurgy   63 ( 3 )   257 - 267   2002.3

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    DOI: 10.1016/S0304-386X(01)00228-6

  • Enhancement of chalcopyrite leaching by ferrous ions in acidic ferric sulfate solutions Reviewed

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Hydrometallurgy   60 ( 3 )   185 - 197   2001.5

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    DOI: 10.1016/S0304-386X(00)00155-9

  • Model for ferrous-promoted chalcopyrite leaching Reviewed

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Hydrometallurgy   57 ( 1 )   31 - 38   2000.1

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    Language:English  

    DOI: 10.1016/S0304-386X(00)00089-X

  • Ferrous Promoted Chalcopyrite Leaching Reviewed International journal

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Proceedings of 4th Copper1999-Cobre1999 International Conference   4   231 - 243   1999.10

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    Language:English  

  • Effect of Several Inhibitors to Thiobacillus ferrooxidans on Ferrous Promoted Chalcopyrite Leaching Reviewed

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Journal of MMIJ   115   172 - 176   1999.3

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    Language:English  

  • Ferrous Promoted Chalcopyrite Leaching -Ferric Formation and its Effects on the Leaching- Reviewed

    Naoki Hiroyoshi, Hideto Maeda, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Journal of MMIJ   114 ( 11 )   795 - 800   1998.10

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    Language:Japanese  

    Ferrous Promoted Chalcopyrite Leaching -Ferric formation and its effects on the leaching-
    This paper shows that ferrous ions are more useful for leaching chalcopyrite than oxidant ferric ions in sulfuric acid solutions in air at ambient temperatures. Leaching experiments and dissolved oxygen consumption measurements were carried out with a very pure chalcopyrite and 0.001 ∼ 1 mol dm-3 sulfuric acid containing 0 ∼ 0.1 mol dm-3 ferrous or ferric ions at 303 K. Chalcopyrite oxidation with dissolved oxygen was promoted by ferrous ions and was suppressed by ferric ions. As a result, the amount of extracted copper was higher with ferrous ions than with ferric ions in air. During the ferrous promoted chalcopyrite leaching, extracted copper ions catalyzed oxidation of ferrous ions to ferric ions which suppressed copper extraction. This result indicates that higher leaching rates can be achieved by reducing the ferric ions formed during the leaching.

    DOI: 10.2473/shigentosozai.114.795

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Books

Presentations

  • Estimation of Cu and Mo recoveries of five type ores composite in seawater flotation International conference

    Y. TANAKA, T. HIRAJIMA, H. MIKI, G.P.W. SUYANTARA

    Copper2022 International Conference  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • The estimation of microgram powder electrode system on sulfide mineral oxidation for mineral processing International conference

    H. MIKI, H. FUKUDA, G.P.W. SUYANTARA, B. DANIYAROV, T. HIRAJIMA, K. SASAKI

    Copper2022 International Conference  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • Arsenic removal from arsenic containing copper concentrate with heat treatment and magnetic separation International conference

    H. MIKI, G.P.W. SUYANTARA, K. SASAKI, T. HIRAJIMA, Y. AOKI, H. FUKUDA

    Copper2022 International Conference  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • Investigation of sodium sulfite as a selective depressant in the flotation of chalcopyrite and enargite International conference

    G.P.W. SUYANTARA, T. HIRAJIMA, H. MIKI, K. SASAKI, Y. TANAKA, Y. AOKI

    Copper2022 International Conference  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • Separation of enargite and chalcocite with H2O2 oxidation treatment using flotation method International conference

    B. DANIYAROV, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI, D. OCHI, Y. AOKI

    The 16th International Symposium on East Asian Resources Recycling Technology, (EARTH2021)  2021.11 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Taiwan, Province of China  

  • Suppression of Pyrite and Arsenopyrite Oxidation by Silica Coating: Electrochemical aspects and the mechanism International conference

    Hajime MIKI, Tsuyoshi HIRAJIMA, Mutia Dewi YUNIATI, Keiko SASAKI

    XXVII International Mineral Processing Congress (IMPC 2014)  2014.10 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • 含砒素硫化銅鉱物の硫酸浸出に対する銀および溶液電位調整の影響

    井口明信, 三木一, 平島剛, 笹木圭子, 澤田満

    資源・素材学会 春季大会  2015.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • 硫酸酸性溶液中における含砒素銅鉱物浸出の電位依存性

    三木 一, 井口 明信, 平島 剛, 笹木 圭子, 澤田 満

    資源・素材学会 春季大会  2014.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 生産技術研究所   Country:Japan  

  • Study of Silicate Coating on Pyrite Oxidation Suppression: Fundamental Mechanism and Kinetic Analysis International conference

    Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki

    International Symposium on Earth Science and Technology 2013  2013.12 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Suppression of Pyrite Oxidation by Silicate Coating with Catechol Complex Oxidation – Kinetics Estimation with Electrochemistry International conference

    2013.11 

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    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sunshine Hotel & Resort Zhangjiajie   Country:China  

    Other Link: http://www.earth2013.org/

  • オーストラリアにおける鉱物資源開発の現状

    三木 一

    資源・素材学会 九州支部 春季例会  2013.5 

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    Event date: 2013.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 沈降シリカによる黄銅鉱浸出の触媒作用の研究

    三木 一, Gamini Senanayake

    資源・素材学会 春季大会  2013.3 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • Applications of the electrochemistry of fine mineral sulfides International conference

    Michael James Nicol, Hajime Miki

    Innovations in Natural Resource Processing  2005.2 

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    Event date: 2005.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Mechanisms of Catalytic Leaching of Chalcopyrite International conference

    Hajime Miki, Naoki Hiroyoshi, Shigeto Kuroiwa, Masami Tsunekawa, Tsuyoshi Hirajima

    Copper2003 International Conference  2003.9 

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    Event date: 2003.8 - 2003.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • 硫酸溶液中での黄銅鉱のサイクリックボルタモグラムに及ぼす各種金属イオンの影響 -黄銅鉱浸出の電位依存性に関する研究(第2報)-

    三木 一, 広吉直樹, 平島剛, 恒川昌美

    資源素材学会 2001年春季大会  2001.3 

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    Event date: 2001.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:芝浦工業大学芝浦校舎   Country:Japan  

  • Fe(Ⅱ)による黄銅鉱浸出促進に関する研究(第4報) -Cu(Ⅱ)添加と電位調節の効果-

    三木 一, 広吉直樹, 平島剛, 恒川昌美

    資源素材学会2000年春季大会  2000.3 

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    Event date: 2000.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学津田沼校舎   Country:Japan  

  • Fe(Ⅱ)による黄銅鉱浸出促進に関する研究(第1報)-Fe(Ⅲ)による黄銅鉱酸化に及ぼすFe(Ⅱ)の影響と銅の重要性

    広吉直樹, 三木 一, 平島剛, 恒川昌美

    資源素材学会1999年春季大会  1999.3 

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    Event date: 1999.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学理工学部   Country:Japan  

  • Fe(Ⅱ)イオンによる黄銅鉱酸化浸出の促進

    三木 一, 広吉直樹, 恒川昌美, 平島剛

    資源素材学会 北海道支部春季講演会  1997.6 

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    Event date: 1997.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学学術交流会館   Country:Japan  

  • 九州大学における銅原料中からのヒ素低減技術開発の取り組み

    三木 一、Suyantara Gde Pandhe Wisnu、平島 剛、沖部 奈緒子、笹木 圭子、青木 悠二、忰山 卓矢

    資源・素材2021年度 春季大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 海水でのCu-Mo選択浮遊選別法の開発

    瀬元 祐希、スヤンタラ グディパンディウィスヌ、三木 一、笹木 圭子、平島 剛、青木 悠二、田中 善之

    資源・素材2021年度 春季大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • The study of selective flotation separation of copper-molybdenite with seawater International conference

    International Symposium on Earth Science and Technology 2020  2020.11 

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    Event date: 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Effect of a sulfite reagent on floatability of chalcopyrite and enargite International conference

    IMPC 2020:XXX International Mineral Processing Congress  2020.10 

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Selective flotation for removal of impurities on copper concentrates with various redox reactions International conference

    IMPC 2020:XXX International Mineral Processing Congress  2020.10 

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Effect of seawater and process water on copper-molybdenum rougher flotation in batch and pilot test International conference

    IMPC 2020:XXX International Mineral Processing Congress  2020.10 

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • 海水下での黄銅鉱・輝水鉛鉱選択的浮遊選別に関する研究

    瀬元祐希、Gde Pandhe Wisnu Suyantara、三木 一、笹木 圭子、平島剛、青木 悠二

    一般社団法人資源・素材学会 2020年度 九州支部会  2020.5 

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    Event date: 2020.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka, Japan   Country:Japan  

  • 海水を用いたCu-Mo選択浮遊選別に関する研究

    瀬元 祐希、Gde Pandhe Wisnu Suyantara、三木 一、平島 剛、青木 悠二、 黒岩 樹人、田中 善之

    資源・素材学会春季大会  2020.3 

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    Event date: 2020.3 - 2022.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 含ヒ素硫化銅鉱物と非含ヒ素硫化銅鉱物の浮選分離に及ぼす捕収剤の影響

    折居優太、Gde Pandhe Wisnu Suyantara、三木一、笹木圭子、 平島剛、黒岩樹人、青木悠二、山根正嗣

    資源・素材学会春季大会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • Study of selective flotation of copper sulfide and As containing copper minerals International conference

    Yuta Orii, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Tsuyoshi Hirajima, Shigeto Kuroiwa, Yuji Aoki

    International Symposium on Earth Science and Technology 2019  2019.11 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Effect of hydrogen peroxide on the separation of copper sulfide minerals and arsenic-bearing copper minerals using flotation International conference

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki

    Flotation'19 International Conference  2019.10 

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Effect of seawater on bubble interactions with chalcopyrite and molybdenite surfaces International conference

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki

    Flotation'19 International Conference  2019.10 

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Selective Flotation on Chalcopyrite and Molybdenite with Various Redox Reactions International conference

    Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    The 15th Internatonal Symposium on East Asian Resources Recycling Technology  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  • 亜硫酸ナトリウム添加による硫化銅鉱物と含ヒ素銅鉱物の浮選分離に関する研究

    折居優太、Gde Pandhe Wisnu Suyantara、三木一、笹木圭子、平島剛、黒岩樹人、青木悠二

    資源・素材学会秋季大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都   Country:Japan  

  • Separation of molybdenite and chalcopyrite using various oxidation treatments International conference

    Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Mitsuru Sawada

    10th Copper International Conference  2019.8 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • Effect of Heating Treatment on Magnetic Properties International conference

    Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki

    10th Copper International Conference  2019.8 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • 亜硫酸ナトリウム添加による斑銅鉱とヒ四面銅鉱の浮選分離に関する研究

    折居優太、Gde Pandhe Wisnu Suyantara、三木一、笹木圭子、平島剛

    資源・素材学会九州支部会  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡   Country:Japan  

  • Evaluation of Catalytic Effect of Activated Carbon on Enargite Bioleaching International conference

    International Symposium on Earth Science and Technology 2018, Fukuoka, Japan  2018.11 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Carbon-assisted bioleaching of chalcopyrite concentrate International conference

    International Symposium on Earth Science and Technology 2018, Fukuoka, Japan  2018.11 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 硫砒銅鉱バイオリーチングにおける活性炭触媒の影響

    小山 恵史、 三木 一、 笹木 圭子、 沖部 奈緒子

    資源・素材学会秋季大会  2018.9 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Investigation of reagents for selective flotation on chalcopyrite and molybdenite International conference

    XXIV International Mineral Processing Congress (IMPC 2018), Moscow, Russia  2018.8 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Russian Federation  

    Investigation of reagents for selective flotation on chalcopyrite and molybdenite

  • The use of Fenton’s reagent on selective flotation of chalcopyrite and molybdenite International conference

    Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Miki Hajime、Sasaki Keiko

    2018.8 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Moscow, Russia   Country:Russian Federation  

  • Effect of Seawater on Selective Flotation of Chalcopyrite and Molybdenite International conference

    Gde Pandhe Wisnu SUYANTARA, Tsuyoshi HIRAJIMA, Hajime MIKI, Keiko SASAKI

    International Symposium on Earth Science and Technology 2017 (CINEST)  2017.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 電気化学的表面処理を行った黄銅鉱と輝水鉛鉱の浮選分離

    松岡秀和, 平島剛, 笹木圭子, 三木一, 市川修, 澤田満

    資源・素材学会 九州支部会  2014.5 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 初期溶液電位調整による含砒素硫化銅鉱物の硫酸浸出挙動

    井口明信 三木一 平島剛 笹木圭子 澤田満

    資源・素材学会 九州支部会  2014.5 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 新型微量粉末電極を用いた黄銅鉱浸出挙動の解析

    三木一, 平島剛, 岡和儀, 笹木圭子

    資源・素材学会 秋季大会  2014.9 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • シリカコーティングによる黄鉄鉱の酸化抑制の検証に関する電気化学インピーダンス法の有用性

    Yuniati Mutia Dewi, 平島剛, 三木一, 笹木圭子

    資源・素材学会 秋季大会  2014.9 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • Selective Flotation of Chalcopyrite and Molybdenite by Surface Oxidation International conference

    Tsuyoshi HIRAJIMA, Masanori MORI, Osamu ICHIKAWA, Keiko SASAKI, Hajime MIKI, Mitsuru SAWADA

    XXVII International Mineral Processing Congress (IMPC 2014)  2014.10 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • The Effect of Solution Potential and Silver Ion Addition on Dissolution Rate of Enargite International conference

    Akinobu IGUCHI, Hajime MIKI, Tsuyoshi HIRAJIMA, Keiko SASAKI, Mitsuru SAWADA

    International Symposium on Earth Science and Technology 2014 (CINEST)  2014.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Silica Covering Layer on the Chalcopyrite Surface: Electrochemical Behaviors and Depression Effect on Copper-Molybdenum Flotation International conference

    Mutia Dewi YUNIATI, Tsuyoshi HIRAJIMA, Hajime MIKI, Keiko SASAKI

    International Symposium on Earth Science and Technology 2014 (CINEST)  2014.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Electrochemical Treatment of Molybdenite and Chalcopyrite International conference

    Hidekazu MATSUOKA, Tsuyoshi HIRAJIMA, Keiko SASAKI, Hajime MIKI, Mitsuru SAWADA

    International Symposium on Earth Science and Technology 2014 (CINEST)  2014.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Seawater Divalent Cations (MgCl2 and CaCl2) Effect on the Flotation of Molybdenite and Chalcopyrite International conference

    Tsuyoshi Hirajima, Osamu ICHIKAWA, G.P.W. SUYANTARA, Hajime Miki, Sasaki Keiko, Ahmed Mohamed Elmahdy Ahmed MOHAMED

    2015.11 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Study of Selective Flotation of Chalcopyrite and Molybdenite with Various Oxidation International conference

    Tsuyoshi Hirajima, Hidekazu MATSUOKA, Hajime Miki, Ahmed Mohamed Elmahdy Ahmed MOHAMED, Sasaki Keiko

    2015.11 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Bioleaching of Highly Refractory Chalcopyrite in The Presence of Silver Catalyst International conference

    Yusei MASAKI, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    International Symposium on Earth Science and Technology 2015 (CINEST)  2015.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Selective Bioleaching of Enargite (Cu3AsS4) over Pyrite (FeS2) for Cu Recovery International conference

    Keishi OYAMA, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki, Naoko Okibe

    International Symposium on Earth Science and Technology 2015 (CINEST)  2015.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Effect of Silver Addition in Potential Controlled Solution on Dissolution Rate of Enargite International conference

    Akinobu IGUCHI, Hajime Miki, Tsuyoshi Hirajima, Sasaki Keiko

    International Symposium on Earth Science and Technology 2015 (CINEST)  2015.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Various Surface Treatment Techniques of Molybdenite and Chalcopyrite International conference

    Hidekazu MATSUOKA, Tsuyoshi Hirajima, Sasaki Keiko, Hajime Miki

    International Symposium on Earth Science and Technology 2015 (CINEST)  2015.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Effect of Kerosene on Bubble Interaction with Molybdenite and Chalcopyrite in MgCl2 Solution International conference

    Gde Pandhe Wisnu SUYANTARA, Tsuyoshi HIRAJIMA, A. M. ELMAHDY, Hajime MIKI, Keiko SASAKI

    XXVIII International Mineral Processing Congress (IMPC 2016)  2016.10 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • Comparison of Selective Flotation of Chalcopyrite and Molybdenite with Various Oxidation Techniques International conference

    Tsuyoshi HIRAJIMA, Hidekazu MATSUOKA, Hajime MIKI, Gde Pandhe Wisnu SUYANTARA, Ahmed Mohamed ELMAHDY, Keiko SASAKI

    XXVIII International Mineral Processing Congress (IMPC 2016)  2016.10 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • Oxidation of Chalcopyrite and Molybdenite with Hydrogen Peroxide and its Application to Their Separation International conference

    Tsuyoshi HIRAJIMA, Hajime MIKI, G.P.W. SUYANTARA, Hidekazu MATSUOKA, Keiko SASAKI

    Fifth International conference on Multifunctional, Hybrid and Nanomaterials  2017.3 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Portugal  

  • Mechanism of Silver-Catalyzed Bioleaching of Enargite Concentrate International conference

    2017.9 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:フライベルグ   Country:Germany  

  • Development of Alternative Additive of NaHS for Selective Flotation of Chalcopyrite and Molybdenite International conference

    Tsuyoshi HIRAJIMA, Hajime MIKI, Y. MUTA, G.P.W. SUYANTARA, Keiko SASAKI

    2017.11 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Study on the Effect of a Mixture of Hydrogen Peroxide and Ferrous Sulfate on the Floatability of Chalcopyrite and Molybdenite International conference

    G.P.W. SUYANTARA, Tsuyoshi HIRAJIMA, Hajime MIKI, Keiko SASAKI

    2017.11 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Catalytic Effect of Activated Carbon on Bioleaching of Enargite Concentrate International conference

    Keishi Oyama, Haruki NOGUCHI, Tsuyoshi HIRAJIMA, Keiko SASAKI, Hajime MIKI, Naoko OKIBE

    International Symposium on Earth Science and Technology 2017 (CINEST)  2017.12 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Mechanism of silver-catalyzed bioleaching of enargite concentrate

    Keishi Oyama, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Naoko Okibe

    22nd International Biohydrometallurgy Symposium, 2017  2017.1 

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    Event date: 2017.9

    Language:English  

    Country:Germany  

  • Selective flotation of chalcopyrite and molybdenite by surface oxidation

    Tsuyoshi Hirajima, Masanori Mori, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    27th International Mineral Processing Congress, IMPC 2014 

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    Event date: 2014.10

    Language:English  

    Country:Chile  

  • 硫砒銅鉱のバイオリーチングにおける銀触媒の影響

    小山恵史, 平島 剛, 笹木 圭子, 三木 一, 沖部 奈緒子

    資源・素材学会 春季大会  2016.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • シリカコーティングによる硫化鉱の酸化挙動

    Mutia Dewi Yuniati, 平島 剛, 三木 一, 笹木 圭子

    資源・素材学会 春季大会  2014.3 

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    Event date: 2014.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京大学 生産技術研究所   Country:Japan  

  • 黄銅鉱と輝水鉛鉱の浮選分離に関する研究

    市川 修, 平島 剛, 森 優典, 笹木 圭子, 三木 一, 澤田 満

    資源・素材学会 春季大会  2014.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 生産技術研究所   Country:Japan  

  • 黄銅鉱と輝水鉛鉱の電気化学的表面処理に関する研究

    松岡秀和, 平島剛, 笹木圭子, 三木一, 澤田満

    資源・素材学会 春季大会  2015.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • 表面酸化による難処理硫化鉱の分離に関する研究

    平島 剛, 三木 一, 松岡秀和, Suyantara G.P.W., Elmahdy A. M., 笹木 圭子

    資源・素材学会 春季大会  2016.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • XPS and AFM Analysis of Plasma Oxidized Chalcopyrite and Molybdenite for New Selective Flotation Technique International conference

    Osamu Ichikawa, Tsuyoshi Hirajima, Masanori Mori, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    International Conference on Biological, Civil and Environmental Engineering (BCEE-2014)  2014.3 

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    Event date: 2014.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Arab Emirates  

  • Floatability Modification of Chalcopyrite and Molybdenite with Plasma Treatment International conference

    Masanori Mori, Tsuyoshi Hirajima, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    International Symposium on Earth Science and Technology 2013  2013.12 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Electrochemical Study of Silicate Coating on Sulphide Minerals Oxidation International conference

    Mutia Dewi Yuniati, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki

    International Symposium on Earth Science and Technology 2013  2013.12 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Surfaces Characterization of Plasma Treated Chalcopyrite and Molybdenite International conference

    Osamu Ichikawa, Tsuyoshi Hirajima, Masanori Mori, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    International Symposium on Earth Science and Technology 2013  2013.12 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment International conference

    Tsuyoshi Hirajima, Masanori Mori, Osamu Ichikawa, Keiko Sasaki, Hajime Miki, Mitsuru Sawada

    Flotation '13  2013.11 

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    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

    Other Link: http://www.min-eng.com/flotation13/

  • 酸化処理による黄銅鉱と輝水鉛鉱の浮選分離に関する研究

    森優典, 市川修, 平島 剛, 笹木 圭子, 三木 一, 澤田満

    資源・素材学会 秋季大会  2013.9 

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    Event date: 2013.9 - 2013.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • プラズマ酸化処理による黄銅鉱と輝水鉛鉱の表面性状変化

    市川修, 森優典, 平島 剛, 笹木 圭子, 三木 一, 澤田満

    資源・素材学会 秋季大会  2013.9 

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    Event date: 2013.9 - 2013.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • Hydrothermal Treatment of Coconut Shell and Recovery of Furfural International conference

    International Conference on Green Energy and Technologies (ICGET)  2013.8 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 浮遊選別による黄銅鉱と輝水鉛鉱の分離に関する研究

    市川修, 森優典, 平島 剛, 笹木 圭子, 三木 一, 澤田満

    資源・素材学会 九州支部 春季例会  2013.5 

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    Event date: 2013.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 硫化鉱物浮選に関する研究

    森優典, 市川修, 平島 剛, 笹木 圭子, 三木 一, 澤田満

    資源・素材学会 春季大会  2013.3 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学   Country:Japan  

  • The Development of Heap Leaching Based on Chloride for Primary and Secondary Copper Minerals International conference

    Michael James Nicol, Hajime Miki, Derick Rautenbach, Craig van Buuren, Norma Hoyos, Lilian Velasquez

    Hydroprocess2012  2012.7 

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    Event date: 2012.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Chile  

  • The Development of Heap Leaching Based on Chloride for Primary and Secondary Copper Minerals International conference

    Hajime Miki, Michael James Nicol, Rautenbach Derick, Lilian Velasquez, Craig van Buuren

    Percolation Leaching: The status globally and in Southern Africa 2011  2011.11 

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    Event date: 2011.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:South Africa  

  • Enhanced Leaching of Chalcopyrite at Low Potentials in Chloride Solutions. 1. Concentrates International conference

    Petrus Basson, Hajime Miki, Michael James Nicol, Lilian Velasquez

    Copper2010 International Conference  2010.6 

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    Event date: 2010.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  • Enhanced Leaching of Chalcopyrite at Low Potentials in Chloride Solutions. 1. Mechanisms International conference

    Petrus Basson, Hajime Miki, Michael James Nicol, Lilian Velasquez

    Copper2010 International Conference  2010.6 

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    Event date: 2010.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  • Synergism in the oxidation of covellite and pyrite by iron(III) and copper(II) ions in chloride solutions

    Hajime Miki, Michael Nicol

    Hydrometallurgy 2008: 6th International Symposium 

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    Event date: 2008.8

    Language:English  

    Country:United States  

  • The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions

    Hajime Miki, Michael Nicol

    Hydrometallurgy 2008: 6th International Symposium 

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    Event date: 2008.8

    Language:English  

    Country:United States  

  • The Kinetics of the Copper-catalysed Oxidation of Iron(II) in Chloride Solutions International conference

    Hajime Miki, Michael James Nicol

    Hydrometallurgy 2008  2008.8 

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    Event date: 2008.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Synergism in the oxidation of covellite and pyrite in chloride solutions containing iron(III) and copper(II) International conference

    Hajime Miki, Michael James Nicol

    Hydrometallurgy 2008  2008.8 

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    Event date: 2008.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Applications of the electrochemistry of fine mineral sulfides

    Michael J. Nicol, Hajime Miki

    Proceedings of the Jan D. Miller Symposium - Innovations in Natural Resource Processing 

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    Event date: 2005.2 - 2005.3

    Language:English  

    Country:United States  

  • 黄銅鉱浸出の臨界電位に及ぼす各種金属イオンの影響 -黄銅鉱浸出の電位依存性に関する研究(第1報)-

    広吉直樹, 黒岩樹人, 三木 一, 平島剛, 恒川昌美

    資源素材学会 2001年春季大会  2001.3 

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    Event date: 2001.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:芝浦工業大学芝浦校舎   Country:Japan  

  • 硫酸溶液中における黄銅鉱浸出の溶液電位依存性とAg(Ⅰ)の触媒作用

    広吉直樹, 荒井政俊, 三木 一, 平島剛, 恒川昌美

    資源素材学会 2000年春季大会  2000.3 

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    Event date: 2000.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学津田沼校舎   Country:Japan  

  • Ferrous promoted chalcopyrite leaching

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Fourth International Conference COPPER 99 - COBRE 99 

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    Event date: 1999.10

    Language:English  

    Country:United States  

  • Ferrous Promoted Chalcopyrite Leaching International conference

    Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

    Copper1999 International Conference  1999.9 

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    Event date: 1999.8 - 1999.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • 鉄(Ⅱ)イオンを促進剤とする黄銅鉱酸素酸化浸出の過程における鉄(Ⅲ)イオンの生成

    広吉直樹, 三木 一, 前田英人, 恒川昌美, 平島剛

    資源素材学会1998年春季大会  1999.3 

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    Event date: 1999.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学理工学部   Country:Japan  

  • Fe(Ⅱ)による黄銅鉱浸出促進に関する研究(第3報) -浸出促進を説明する反応モデルとその熱力学的成立条件-

    広吉直樹, 三木 一, 平島剛, 恒川昌美

    資源素材学会1999年春季大会  1999.3 

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    Event date: 1999.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学理工学部   Country:Japan  

  • Fe(Ⅱ)による黄銅鉱浸出促進に関する研究(第2報)-Fe(Ⅱ)-Cu(Ⅱ)混合溶液で前処理した黄銅鉱電極のアノード分極特性-

    広吉直樹, 荒井政俊, 三木 一, 平島剛, 恒川昌美

    資源素材学会1999年春季大会  1999.3 

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    Event date: 1999.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学理工学部   Country:Japan  

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Industrial property rights

Patent   Number of applications: 11   Number of registrations: 0
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:39

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:10

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:11

  • Screening of academic papers

    Role(s): Peer review

    2018

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:29

  • Screening of academic papers

    Role(s): Peer review

    2017

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:10

  • Screening of academic papers

    Role(s): Peer review

    2016

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:3

  • その他

    資源素材学会 春季大会  ( 東京 東京大学 生産技術研究所 Japan ) 2014.3

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2014

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Other International contribution

    International Symposium on Earth Science and Technology 2013  ( Kyushu University, Fukuoka Japan Japan ) 2013.12

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    Type:Competition, symposium, etc. 

  • Other International contribution

    The 12th International Symposium on East Asian Resources Recycling Technology  ( Zhangjiajie, China Japan Japan ) 2013.11

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  • その他

    資源素材学会 秋季大会  ( 札幌 北海道大学 Japan ) 2013.9

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Research Projects

  • 海底熱水鉱床からの有価物回収技術開発

    2023.8 - 2025.3

    受託研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 難処理複雑銅鉱石からの黄鉄鉱抑制浮遊選別による銅高品位化の研究

    2022.8 - 2023.3

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • Cu-Mo,Cu-As分離浮選に関する研究

    2022.4 - 2023.3

    住友金属鉱山株式会社 

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    Authorship:Principal investigator 

    含ヒ素銅精鉱、含モリブデン銅精鉱から銅とヒ素、モリブデンを浮遊選別により分離する

  • Development of innovative Cu-As-Mo complex ore separation with seawater flotation

    Grant number:22H00310  2022 - 2025

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

    CiNii Research

  • development of novel hydrometallurgical process with micro powder electrode system

    Grant number:21K18923  2021 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Exploratory)

    Miki Hajime

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    Authorship:Principal investigator  Grant type:Scientific research funding

    In the method of making ultra-small powder electrodes, a quantitative reproducible method was established and improved. Using these methods, we were able to evaluate the flotation method using redox agent for the separation of copper-arsenic minerals, which has been considered difficult so far. In addition, for the separation of copper-arsenic minerals, we also studied a method using magnetic sorting after heating, and evaluated the mineral changes before and after heating. In addition, we examined the promotion of the advancement of copper and arsenic sulfide minerals, which are known as difficult-to-process minerals in hydrometallurgy, and clarified that the leaching rate is greatly accelerated by the formation of pyroxenite, which is more easily leached in the presence of copper ions, in several minerals. These findings have not been reported.

    CiNii Research

  • CuMo分離浮選、CuAs分離浮選に関する研究

    2020.4 - 2023.3

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • Cu-Mo分離浮選に関する研究

    2020.4 - 2021.3

    住友金属鉱山株式会社 

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    Authorship:Principal investigator 

    銅モリブデン精鉱より銅とモリブデンを浮遊選別により分離する

  • グラファイト質金鉱石のバイオハイドロメタラジーの学理

    Grant number:19KK0135  2019 - 2023

    日本学術振興会  科学研究費助成事業  国際共同研究強化(B)

    笹木 圭子, 三木 一, 金田 隆, GUO BINGLIN, KONADU KOJO・TWUM, Suyantara Gde・Pandhe・Wisnu

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

    いまだに焙焼法が適用されているグラファイト質金鉱石を対象とし、マイルドなシークエンシャルバイオ処理による金回収率の向上をめざす。金回収ロスにつながる炭素の分布、金の所在とその分布、金のホスト鉱物の単体分離度、炭素のグラファイト化度などに焦点を合わせた特性化に基づき、鉄酸化菌による硫化物の分解、アルカリ洗浄、湿式粉砕、リグニンペルオキシダーゼを含む粗酵素液による芳香族炭素の分解などの工程の組み合わせを検討する。処理中間体及び最終固体残差のQEMSCAN観察を通して、Au(0)回収ロスを極限まで最小化する。QEMSCAN分析に熟練した豪州側と協働しておこなうことにより本国際共同研究を一層強化する。

    CiNii Research

  • 海水を利用した浮遊選別法によるヒ素含有難処理硫化銅鉱からの銅・モリブデン分離回収

    Grant number:19H02659  2019 - 2021

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    三木 一, 笹木 圭子

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    Authorship:Principal investigator  Grant type:Scientific research funding

    世界の銅鉱山は、有価なモリブデンと有害なヒ素やアンチモン等を随伴するなど難処理化が進行する傾向にある。申請者は、鉱物処理工程(浮遊選別)において海水を用い、安価な酸化還元剤と組み合わせることにより、銅およびモリブデンを分離して回収する良好な予備試験結果を得てきた。本効果を、各種精密な電気化学的手法により解析し、鉱物表面に起こる酸化還元反応と生成物を同定することにより、分離機構と、より効率的な手法について探索する。また、実際の難処理銅鉱に適用し、黄鉄鉱など不純物の影響や、脈石成分、粘土鉱物に対する酸化還元剤や海水成分の影響等、海水を用いた浮遊選別法の確立にあたり必要な条件と有用性を検討する。

    CiNii Research

  • アドバンストハイドロメタラジーのための超微量粉末電気化学の確立

    Grant number:19K22156  2019 - 2020

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • AEを用いた乾鉱挙動の計測技術の確立

    2018.4 - 2019.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 銅原料中の不純物低減技術開発事業

    2017.11 - 2022.3

    受託研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 銅原料中の不純物低減技術開発

    2017.10 - 2021.3

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    Authorship:Coinvestigator(s) 

    銅の鉱物、精鉱より、ヒ素成分を低減する。

  • 難処理鉱の乾式処理による銅と砒素ならびにモリブデンの最適分離プロセス開発

    2016.4 - 2017.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 難処理鉱の浮選によるモリブデンと銅の最適分離技術開発

    2016.4 - 2017.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 放射性核種埋設に向けたジオミメティクスに由来する新規吸着材の開発

    Grant number:16H02435  2016 - 2018

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 超微量粉末電極を利用した新規電気化学システムのミネラルプロセッシングへの応用

    Grant number:16K06929  2016 - 2018

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 高ヒ素含有銅鉱石ミネラルプロセシングのイノベーション

    Grant number:15H02333  2015 - 2017

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 難処理鉱の選鉱技術に関する研究

    2014.4 - 2016.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 銅・砒素分離技術に関する研究

    2014.4 - 2015.3

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 銅精鉱の品質向上に関する研究

    2013.4 - 2018.3

    住友金属鉱山(株) 

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    Authorship:Coinvestigator(s) 

    黄銅鉱と輝水鉛鉱の分離回収に関する研究

  • アンモニア溶液を利用した低品位銅鉱のヒープリーチングに関する研究

    2011.9 - 2012.6

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • 塩化物溶液による黄銅鉱浸出における酸化還元電位調節の影響

    2002.9 - 2011.6

    共同研究

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • ジオミメティクスを活用した放射性核種の長期安定化への技術革新

    Grant number:19H00883 

    笹木 圭子, 出光 一哉, 三木 一, 赤松 寛文

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    Grant type:Scientific research funding

    陰イオン放射性核種は地殻の主要構成鉱物であるケイ酸塩と静電気的に反発し拡散しやすく、半減期が長いため、より大きな環境リスクをもつ。低レベル放射性廃棄物のセメント固化過程において、これらのマトリクスとして生成するハイドロカルマイト(Afm)はエトリンガイト(Aft)へ相変化する傾向がある。しかし、Aftは1分子に結晶水を24~26個もつため環境の温度や湿度に影響を受けやすくより脆弱である。本研究では、系内に共存するジオミメティクスの活用によりこの相平衡を傾ける方法の提案、これらのジオポリマー固化法の最適化、ジオポリマー固化体中核種の結合状態の推定、放射性核種の長期安定化のための技術開発を行う。

    CiNii Research

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Educational Activities

  • Earth System Engineering Course lecture: resource processing
    Earth Resource System Engineering Department graduate school lecture: resource processing and environmental remediation engineering
    Cooperative Program Department graduate school lecture: resource separation engineering
    Cooperative Program Department graduate school lecture: international human resource exchange seminar
    Cooperative Program: curricurrum comittee

Class subject

  • 資源分離精製工学

    2023.12 - 2024.2   Winter quarter

  • 国際人材交流セミナー

    2023.4 - 2024.3   Full year

  • 国際フィールド調査

    2023.4 - 2024.3   Full year

  • 資源分離精製工学

    2022.12 - 2023.2   Winter quarter

  • 国際フィールド調査

    2022.4 - 2023.3   Full year

  • 国際人材交流セミナー

    2022.4 - 2023.3   Full year

  • 資源分離精製工学

    2021.12 - 2022.2   Winter quarter

  • 国際フィールド調査

    2021.4 - 2022.3   Full year

  • 国際人材交流セミナー

    2021.4 - 2022.3   Full year

  • 資源分離精製工学

    2020.12 - 2021.2   Winter quarter

  • 基幹物理学ⅠB演習

    2020.10 - 2021.3   Second semester

  • 資源処理工学

    2020.10 - 2020.12   Fall quarter

  • 国際フィールド調査

    2020.4 - 2021.3   Full year

  • 国際人材交流セミナー

    2020.4 - 2021.3   Full year

  • 資源分離精製工学

    2019.12 - 2020.2   Winter quarter

  • 基幹物理学ⅠB演習

    2019.10 - 2020.3   Second semester

  • 資源分離精製工学

    2018.12 - 2019.2   Winter quarter

  • 基幹物理学ⅠB演習

    2018.10 - 2019.3   Second semester

  • 資源処理工学

    2018.10 - 2018.12   Fall quarter

  • 地球システム工学インターンシップ

    2018.4 - 2018.9   First semester

  • 資源分離精製工学

    2017.12 - 2018.2   Winter quarter

  • 資源分離精製工学

    2017.12 - 2018.2   Winter quarter

  • 基幹物理学IB演習

    2017.10 - 2018.3   Second semester

  • 資源処理工学

    2017.10 - 2018.3   Second semester

  • 粉体工学

    2017.10 - 2018.3   Second semester

  • 基幹物理学ⅠB演習

    2017.10 - 2018.3   Second semester

  • 国際人材交流セミナー

    2017.10 - 2017.12   Fall quarter

  • 地球環境修復工学

    2017.10 - 2017.12   Fall quarter

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FD Participation

  • 2022.12   Role:Participation   Title:2022年度 九州大学 情報セキュリティ教育及び自己点検

    Organizer:[Undergraduate school/graduate school/graduate faculty]

Activities contributing to policy formation, academic promotion, etc.

  • 2023.10   九州大学-北海道大学 共同資源工学専攻および資源系コンソーシアム

    九州大学-北海道大学 共同資源工学専攻および資源系コンソーシアム合同でのシンポジウムを行った。講演および研修を行い、これらの企画、調整、引率、司会などを行った。

  • 2022.11   オーストラリア Curtin大学(資源分野世界ランキング2位)

    オーストラリア Curtin大学の学生、教員が、New Colombo planにおいて来日した。地球資源において三木のみで対応し、北九州石灰石鉱山、阿蘇日本リモナイト鉱山見学、阿蘇火山博物館、高千穂、白河水源などによる地質研修などを行い、高い評価を得た。

Travel Abroad

  • 2011.6 - 2012.8

    Staying countory name 1:Chile   Staying institution name 1:Universidad Catolica del Norte

  • 2002.9 - 2011.6

    Staying countory name 1:Australia   Staying institution name 1:Murdoch University