Kyushu University Academic Staff Educational and Research Activities Database
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Hajime Miki Last modified date:2023.06.28

Associate Professor / Frontier Education Center for Global Cooperation in Earth Resources Engineering
Department of Earth Resources Engineering
Faculty of Engineering


Graduate School


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/hajime-miki
 Reseacher Profiling Tool Kyushu University Pure
http://www.tj.kyushu-u.ac.jp/leading/en/index.html
Advanced Graduate Program in Global Strategy for Green Asia .
Phone
092-802-3349
Academic Degree
Ph.D of Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Mining Engineering
ORCID(Open Researcher and Contributor ID)
https://orcid.org/0000-0001-6616-0304
Total Priod of education and research career in the foreign country
10years00months
Outline Activities
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.
Research
Research Interests
  • development of technology of hydrometallurgy, flotation, recycling with chemical physics and electrochemistry
    keyword : Hydrometallurgy, Flotation, Electrochemistry
    1996.04~2026.03.
Academic Activities
Papers
1. B. DANIYAROV, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI, D. OCHI, Y. AOKI , Separation of enargite and chalcocite with H2O2 oxidation treatment using flotation method, Proceedings of the 16th International Symposium on East Asian Resources Recycling Technology (EARTH2022), 1, 2022.10.
2. Y. TANAKA, T. HIRAJIMA, H. MIKI, G.P.W. SUYANTARA, Estimation of Cu and Mo recoveries of five type ores composite in seawater flotation, Proc. of 11th Copper2022 International Conference, 1, 2022.11.
3. G.P.W. SUYANTARA, T. HIRAJIMA, H. MIKI, K. SASAKI, Y.TANAKA, Y. AOKI , Investigation of sodium sulfite as a selective depressant in the flotation of chalcopyrite and
enargite, Proc. of 11th Copper2022 International Conference, 1, 2022.11.
4. H. MIKI, G.P.W. SUYANTARA, K. SASAKI, T. HIRAJIMA, Y. AOKI, H. FUKUDA, Arsenic removal from arsenic containing copper concentrate with heat treatment and magnetic
separation, Proc. of 11th Copper2022 International Conference, 1, 2022.11.
5. H. MIKI, H. FUKUDA, G.P.W. SUYANTARA, B. DANIYAROV, T. HIRAJIMA, K. SASAKI, The estimation of microgram powder electrode system on sulfide mineral oxidation for mineral
processing, Proc. of 11th Copper2022 International Conference, 1, 2022.11.
6. MIKI Hajime、OKIBE Naoko、SUYANTARA Gde Pandhe Wisnu、OYAMA Keishi、SASAKI Keiko、HIRAJIMA Tsuyoshi、NAKAMURA Takeshi、AOKI Yuji、TANAKA Yoshiyuki、SUWA Takahiro, Technical Development of Arsenic Reduction from Copper Resources by Kyushu University and
Sumitomo Metal Mining Co. Ltd.
, Resources Processing , 10.4144/rpsj.68.124, 68, 124-131, 2022.11.
7. Hajime Miki, Akinobu Iguchi, Tsuyoshi Hirajima, Sasaki Keiko, ENHANCED LEACHING OF ARSENIC CONTAINING COPPER SULFIDE WITH SILVER ADDITION IN ACID SOLUTION, Proceedings of Copper2016 International Conference, 1499-1510, 2016.11.
8. Hajime Miki, Review of three leading program joint fieldwork on 2014 at Beppu geothermal area, Proc. of International Forum for Green Asia 2015, Special Issue of Evergreen – Joint Journal of Novel Carbon Resource Sciences & Green Asia Strategy, 87-89, 2015.11.
9. Hajime Miki, Review of three leading program + Texas State University, joint fieldwork on 2015 at Okinoshima island, Proc. of International Forum for Green Asia 2015, Special Issue of Evergreen – Joint Journal of Novel Carbon Resource Sciences & Green Asia Strategy, 90-92, 2015.11.
10. Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki, Study of Silicate Coating on Pyrite Oxidation Suppression: Fundamental Mechanism and Kinetic Analysis, Proceedings of International Symposium on Earth Science and Technology 2013, 189-192, 2013.12.
11. Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki, Suppression of Pyrite Oxidation by Silicate Coating with Catechol Complex Oxidation Kinetics Estimation with Electrochemistry, The 12th International Symposium on East Asian Resources Recycling Technology, 601-604, 2013.11.
12. Hajime Miki, Michael James Nicol, The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions, Hydrometallurgy 2008, Proceedings of 6th International Symposium, 971-979, 2008.10.
13. Hajime Miki, Michael James Nicol, Synergism in the oxidation of covellite and pyrite by iron(III) and copper(II) ions in chloride solutions, Hydrometallurgy 2008, Proceedings of 6th International Symposium, 646-652, 2008.10.
14. Hajime Miki, Naoki Hiroyoshi, Shigeto Kuroiwa, Masami Tsunekawa, Tsuyoshi Hirajima, Mechanisms of Catalytic Leaching of Chalcopyrite, Proceedings of 5th Copper2003-Cobre2003 International Conference, 6, 383-394, 2003.10.
Presentations
1. B. DANIYAROV, G.P.W. SUYANTARA, H. MIKI, T. HIRAJIMA, K. SASAKI, D. OCHI, Y. AOKI , Separation of enargite and chalcocite with H2O2 oxidation treatment using flotation method, The 16th International Symposium on East Asian Resources Recycling Technology, (EARTH2021), 2021.11.
2. Y. TANAKA, T. HIRAJIMA, H. MIKI, G.P.W. SUYANTARA, Estimation of Cu and Mo recoveries of five type ores composite in seawater flotation, Copper2022 International Conference, 2022.11.
3. G.P.W. SUYANTARA, T. HIRAJIMA, H. MIKI, K. SASAKI, Y. TANAKA, Y. AOKI, Investigation of sodium sulfite as a selective depressant in the flotation of chalcopyrite and enargite, Copper2022 International Conference, 2022.11.
4. H. MIKI, G.P.W. SUYANTARA, K. SASAKI, T. HIRAJIMA, Y. AOKI, H. FUKUDA, Arsenic removal from arsenic containing copper concentrate with heat treatment and magnetic separation, Copper2022 International Conference, 2022.11.
5. H. MIKI, H. FUKUDA, G.P.W. SUYANTARA, B. DANIYAROV, T. HIRAJIMA, K. SASAKI , The estimation of microgram powder electrode system on sulfide mineral oxidation for mineral processing, Copper2022 International Conference, 2022.11, Electrochemistry with powder sample is essential for hydrometallurgy since in many case sample can obtain only with powder form such as ground mineral or precipitations. However, powder electrode system is not well developed since it is difficult to obtain reproducibility and sensitivity with current carbon paste electrode. Authors has developed its well sensitivity and reproducibility with relative simple method for powder sample electrode. This system yields highly reproducible results and is sensitive compared with conventional electrode systems for various sulfide minerals. Authors estimate this method to apply oxidation behavior on various sulfide minerals. These results can be utilized with sulfide oxidation leaching or mineral processing method. From this method, results of various primary copper sulfide and secondary sulfide minerals will be indicated and reaction model will be discussed on this research..
6. Hajime MIKI, Tsuyoshi HIRAJIMA, Mutia Dewi YUNIATI, Keiko SASAKI, Suppression of Pyrite and Arsenopyrite Oxidation by Silica Coating: Electrochemical aspects and the mechanism, XXVII International Mineral Processing Congress (IMPC 2014), 2014.10.
7. Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki, Study of Silicate Coating on Pyrite Oxidation Suppression: Fundamental Mechanism and Kinetic Analysis, International Symposium on Earth Science and Technology 2013, 2013.12.
8. Hajime Miki, Tsuyoshi Hirajima, Mutia Dewi Yuniati, Keiko Sasaki, Suppression of Pyrite Oxidation by Silicate Coating with Catechol Complex Oxidation – Kinetics Estimation with Electrochemistry, The 12th Internatonal Symposium on East Asian Resources Recycling Technology, 2013.11, [URL].
9. Michael James Nicol, Hajime Miki, Applications of the electrochemistry of fine mineral sulfides, Innovations in Natural Resource Processing, 2005.02.
10. Hajime Miki, Naoki Hiroyoshi, Shigeto Kuroiwa, Masami Tsunekawa, Tsuyoshi Hirajima, Mechanisms of Catalytic Leaching of Chalcopyrite, Copper2003 International Conference, 2003.09.
Membership in Academic Society
  • Journal of MMIJ
Educational
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