Updated on 2024/09/30

Information

 

写真a

 
SUYANTARA GDE PANDHE WISNU
 
Organization
Faculty of Engineering Department of Earth Resources Engineering Associate Professor
Title
Associate Professor
Contact information
メールアドレス

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Chemical reaction and process system engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Chemical reaction and process system engineering

Degree

  • Doctor of Engineering

Research Interests・Research Keywords

  • Research theme:Mineral processing

    Keyword:Mineral processing

    Research period: 2024

  • Research theme:Mineral extraction

    Keyword:Mineral extraction

    Research period: 2024

  • Research theme:Flotation

    Keyword:Flotation

    Research period: 2024

  • Research theme:Copper-molybdenum separation

    Keyword:Copper-molybdenum separation

    Research period: 2024

  • Research theme:Copper-arsenic separation

    Keyword:Copper-arsenic separation

    Research period: 2024

  • Research theme:Bubble-surface interaction

    Keyword:Bubble-surface interaction

    Research period: 2024

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

    Keyword:Flotation / Arsenic-containing copper minerals / Molybdenum-containing copper concentrate / Copper arsenic separation / Copper molybdenum separation / Seawater utilization / Electrochemistry

    Research period: 2022.4 - 2026.3

  • Research theme:Development of separation method for secondary copper and arsenic minerals using flotation

    Keyword:selective flotation, mineral separation, secondary copper sulfide, arsenic bearing minerals, oxidation treatment, selective flotation, surface properties

    Research period: 2022.4 - 2024.3

Awards

  • 48回奨励賞

    2023.3   一般社団法人資源・素材学会  

  • 48th Encouragement Award

    2023.3   The Mining and Materials Processing Institute of Japan  

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  • Excellence Award

    2019.10   Kyushu University Institute for Asian and Oceanian Studies  

  • Young Authors Award

    2016.9   International Mineral Processing Congress  

Papers

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

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

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

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

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    Molybdenite is associated with primary and secondary copper sulfide minerals. Few studies have focused on the selective flotation of molybdenite to separate it from secondary copper sulfide minerals, such as chalcocite. This study evaluated the use of oxidation treatment to separate molybdenite from chalcocite. The effects of oxidation treatment with hydrogen peroxide (H2O2) on the flotation behaviors of molybdenite and chalcocite in the presence of collectors (i.e., potassium amyl xanthate and diesel oil) were evaluated, and the impacts of H2O2 concentration, oxidation treatment duration, and pH level were assessed. Chalcocite flotation tests showed that the H2O2 treatment significantly reduced the recovery of chalcocite due to the formation of copper hydroxide and sulfate species on the chalcocite surface, which altered its surface hydrophobicity. On the other hand, the low surface oxidation of molybdenite led to high flotation recovery after the oxidation treatment. Oxidation treatment with a 10 mM H2O2 solution at a pH of 9 for 20 min resulted in a separation efficiency of 87%, with 98% molybdenite recovery and 11% chalcocite recovery. The results show that H2O2 oxidation treatment enables the selective flotation of molybdenite to separate it from chalcocite.

    DOI: 10.1016/j.powtec.2023.119078

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

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

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

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    The main challenge for the selective flotation of copper and molybdenum (Cu-Mo) sulfide minerals in seawater is the formation of colloidal precipitates in strongly alkaline conditions. These precipitates hinder the selective separation of copper from molybdenum minerals in seawater by lowering the floatability of Cu-Mo sulfide minerals. The present study aimed to examine the direct utilization of seawater in the selective flotation of Cu-Mo sulfides. Additionally, the effectiveness of sodium metabisulfite (Na2S2O5) as a copper depressant for selective flotation of Cu-Mo sulfides in seawater was studied under weakly acidic, neutral, and moderately alkaline conditions. A complex Cu-Mo concentrate that largely consisted of chalcopyrite and molybdenite, as well as a tiny amount of pyrite and quartz, was used in the flotation tests. The flotation results revealed that treatment with 3.6 kg/t Na2S2O5 in seawater at pH 5.5 significantly lowered the copper recovery from 97% to 11% and caused a modest reduction in the molybdenum recovery from 98% to 94% with a Cu-Mo separation efficiency of 83%. These flotation results demonstrate that Na2S2O5 treatment in seawater selectively depresses the floatability of copper minerals. Consequently, molybdenum can be separated from copper minerals under a weakly acidic condition in seawater. In addition, this study discusses the effects of various pH conditions and dosages of Na2S2O5. The surface properties of Cu-Mo minerals were studied using X-ray photoelectron and infrared spectroscopies, and a mechanism to explain the selective flotation of Cu-Mo using Na2S2O5 treatment in seawater is proposed.

    DOI: 10.1016/j.apt.2023.104258

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  • Effect of hydrogen peroxide on selective flotation of chalcocite and enargite

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

    International Journal of Mining Science and Technology   33 ( 6 )   703 - 716   2023.6   ISSN:2095-2686 eISSN:2212-6066

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    Enargite is typically associated with chalcocite. Owing to the similarity in the flotation behaviors of these minerals, both minerals are reported to concentrate in the conventional flotation circuit. However, inorganic arsenic in enargite can decrease the copper concentrate quality and increase the operating cost of processing this concentrate. Separating these minerals is important for cleaner copper production to avoid these effects. In this context, this study investigated the effect of hydrogen peroxide (H2O2) treatment on the flotation behavior of chalcocite and enargite. Flotation tests of pure and mixed minerals indicated that H2O2 treatment reduced the floatability of chalcocite and enargite by forming sulfate and copper hydroxide on their surfaces. Despite the detrimental effect of the H2O2 treatment, there was a narrow window of H2O2 concentration for separating both minerals, in which enargite floated and chalcocite was depressed. This selective flotation behavior was caused by the rapid adsorption of potassium amyl xanthate (KAX) and lower surface oxidation of enargite compared with that of chalcocite.

    DOI: 10.1016/j.ijmst.2023.01.002

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

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

    Journal of Environmental Chemical Engineering   11 ( 3 )   2023.6   ISSN:2213-2929 eISSN:2213-3437

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

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

    Materials Transactions   64 ( 6 )   1225 - 1231   2023.5   ISSN:13459678 eISSN:13475320

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    Language:Others   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 sodium metabisulfite and slaked lime on the floatability and surface properties of chalcopyrite

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

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

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    In the flotation of complex copper ores containing chalcopyrite in seawater, sodium metabisulfite (SMBS) has been widely used as a pyrite depressant. Here, calcium ions in seawater or in process water because of pH control using lime (CaO) or slaked lime (Ca(OH)2) can affect the floatability of chalcopyrite. However, the effect of SMBS on the floatability of chalcopyrite in the presence of calcium ions is unknown. Therefore, the current study investigated the flotation behavior and surface properties of chalcopyrite after treatment with SMBS in the absence and presence of Ca(OH)2. The flotation experiments demonstrated that both SMBS treatment and the addition of Ca(OH)2 exhibited a depressing effect on the natural floatability of chalcopyrite. This depressing effect of SMBS and Ca(OH)2 on the floatability of chalcopyrite was significantly decreased in the presence of potassium amyl xanthate (PAX). However, the combination of SMBS treatment and Ca(OH)2 formed calcium sulfite (CaSO3) on the surface of chalcopyrite, which significantly reduced the recovery of chalcopyrite from 97% to 66% when in the presence of PAX and at a pH of 9.

    DOI: 10.1016/j.powtec.2022.117750

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

    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   ISSN:13486012 eISSN:13499262

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    Language:Japanese   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

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  • Effect of Sodium Metabisulfite on Selective Flotation of Chalcopyrite and Molybdenite

    Yuki Semoto, Gde Pandhe Wisnu Suyantara, Hajime, Keiko Sasaki, Tsuyoshi Hirajima, Yoshiyuki Tanaka, Yuji Aoki, Kumika Ura

    Minerals   11 ( 12 )   2021.12

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    DOI: 10.3390/min11121377

  • Effect of Na<inf>2</inf>SO<inf>3</inf> on the floatability of chalcopyrite and enargite

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

    Minerals Engineering   173   2021.11

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    DOI: 10.1016/j.mineng.2021.107222

  • Mineralogical Prediction on the Flotation Behavior of Copper and Molybdenum Minerals from Blended Cu–Mo Ores in Seawater

    11 ( 8 )   2021.8

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    The copper ore in Chilean copper porphyry deposits is often associated with molybdenum minerals. This copper–molybdenum (Cu–Mo) sulfide ore is generally mined from various locations in the mining site; thus, the mineral composition, oxidation degree, mineral particle size, and grade vary. Therefore, in the mining operation, it is common to blend the ores mined from various spots and then process them using flotation. In this study, the floatability of five types of Cu–Mo ores and the blending of these ores in seawater was investigated. The oxidation degree of these Cu–Mo ores was evaluated, and the correlation between flotation recovery and oxidation degree is presented. Furthermore, the flotation kinetics of each Cu–Mo ore were calculated based on a mineralogical analysis using mineral liberation analysis (MLA). A mineralogical prediction model was proposed to estimate the flotation behavior of blended Cu–Mo ore as a function of the flotation behavior of each Cu–Mo ore. The flotation results show that the recovery of copper and molybdenum decreased with the increasing copper oxidization degree. In addition, the recovery of blended ore can be pre-dicted via the flotation rate equation, using the maximum recovery (Rmax) and flotation rate coeffi-cient (k) determined from the flotation rate analysis of each ore before blending. It was found that Rmax and k of the respective minerals slightly decreased with increasing the degree of copper oxida-tion. Moreover, Rmax varied greatly depending on the mineral species. The total copper and molybdenum recovery were strongly affected by the degree of copper oxidation as the mineral fraction in the ore varied greatly depending upon the degree of oxidation.

    DOI: 10.3390/min11080869

  • Bubble interactions with chalcopyrite and molybdenite surfaces in seawater

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

    Minerals Engineering   157   2020.10

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    DOI: 10.1016/j.mineng.2020.106536

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

    Gde Pandhe Wisnu Suyantara

    Minerals Engineering   152   2020.6

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    DOI: 10.1016/j.mineng.2020.106371

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

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

    IMPC 2018 - 29th International Mineral Processing Congress   1862 - 1871   2019.9

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  • Investigation of reagents for selective flotation on chalcopyrite and molybdenite

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

    IMPC 2018 - 29th International Mineral Processing Congress   1854 - 1861   2019.9

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

    Gde Pandhe Wisnu Suyantara

    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

  • Selective flotation of chalcopyrite and molybdenite using H<inf>2</inf>O<inf>2</inf>oxidation method with the addition of ferrous sulfate

    Suyantara, G.P.W., Hirajima, T., Miki, H., Sasaki, K., Yamane, M., Takida, E., Kuroiwa, S., Imaizumi, Y.

    Minerals Engineering   122   312 - 326   2018.6

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    DOI: 10.1016/j.mineng.2018.02.005

  • Effect of Sodium Sulfite on Floatability of Chalcopyrite and Molybdenite

    Gde Pandhe Wisnu Suyantara

    Minerals   8 ( 4 )   2018.4

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    DOI: 10.3390/min8040172

  • Floatability of molybdenite and chalcopyrite in artificial seawater

    Suyantara, G.P.W., Hirajima, T., Miki, H., Sasaki, K.

    Minerals Engineering   115   117 - 130   2018.1

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    DOI: 10.1016/j.mineng.2017.10.004

  • Effect of hydrogen peroxide on separation of chalcopyrite and molybdenite using flotation

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

    14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017   2017.9

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  • Electrolysis oxidation of chalcopyrite and molybdenite for selective flotation

    Miki, H., Matsuoka, H., Hirajima, T., Suyantara, G.P.W., Sasaki, K.

    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 H<inf>2</inf>O<inf>2</inf>oxidation

    Hirajima, T., Miki, H., Suyantara, G.P.W., Matsuoka, H., Elmahdy, A.M., Sasaki, K., Imaizumi, Y., Kuroiwa, S.

    Minerals Engineering   100   83 - 92   2017.1

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    DOI: 10.1016/j.mineng.2016.10.007

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

    Hirajima, T., Suyantara, G.P.W., Ichikawa, O., Elmahdy, A.M., Miki, H., Sasaki, K.

    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 MgCl<inf>2</inf> solution

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

    IMPC 2016 - 28th International Mineral Processing Congress   2016.9

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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

    IMPC 2016 - 28th International Mineral Processing Congress   2016.9

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  • Effect of kerosene emulsion in MgCl<inf>2</inf>solution on the kinetics of bubble interactions with molybdenite and chalcopyrite

    Suyantara, G.P.W., Hirajima, T., Elmahdy, A.M., Miki, H., Sasaki, K.

    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

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Professional Memberships

  • The Mining and Materials Processing Institute of Japan

    2022 - Present

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  • The Mining and Materials Processing Institute of Japan

Academic Activities

  • Review, evaluation

    External Reviewer  ( Japan ) 2023.10 - 2023.11

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  • External Reviewer

    Role(s): Review, evaluation

    Research Projects of the National Research and Development Agency (ANID) of the Ministry of Science, Technology, Knowledge and Innovation of Chile  2023.10 - 2023.11

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  • Peer review

    Reviewer for Minerals Engineering  ( Japan )

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    Reviewer for Applied Surface Science  ( Japan )

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    Reviewer for Colloids and surfaces  ( Japan )

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  • Peer review

    Reviewer for Journal of sustainable metallurgy  ( Japan )

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    Reviewer for Journal of molecular liquids  ( Japan )

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  • Reviewer for Minerals Engineering

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  • Reviewer for Journal of sustainable metallurgy

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  • Reviewer for Journal of molecular liquids

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  • Reviewer for Colloids and surfaces

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  • Reviewer for Applied Surface Science

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Research Projects

  • 海洋性硫黄代謝微生物を用いた海水利用鉱物処理プロセスの構築

    Grant number:23H03815  2023 - 2025

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    小山 恵史, Suyantara Gde・Pandhe・Wisnu

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    Grant type:Scientific research funding

    海水中での鉱物-微生物反応試験を通して、海洋性硫黄代謝微生物の産業利用を目的とした工学的な基礎実験を実施する。その際、これまで鉱業分野ではマイナーな手法である局所硫黄同位体分析や遺伝子発現動態分析、シンクロトロン分析を融合させることで、今まで明らかとされなかった鉱業試験系における微生物-鉱物間の反応機構の解明に取り組む。最終的には微生物学的情報と工学的情報を統合し,海洋性硫黄代謝微生物の産業利用性判断のための指標づくりを目指す。

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  • 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 (C)

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  • Development of separation method for secondary copper and arsenic minerals using flotation

    Grant number:22K14636  2022 - 2023

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Early-Career Scientists

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • Development of separation method for secondary copper and arsenic minerals using flotation

    Grant number:22K14636  2022 - 2023

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

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    Grant type:Scientific research funding

  • 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  2019.10 - 2024.3

    科学研究費助成事業  国際共同研究加速基金(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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    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。

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