development of micro fine powder electrode electrochemistry for advanced hydrometallurgy

• Project/Area Number: 19K22156
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Kyushu University
• Principal Investigator: MIKI HAJIME 九州大学, 工学研究院, 准教授 (10706386)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
• Keywords: 超微量粉末電極 / 湿式精錬 / 浮遊選別 / ガルバニック電流測定 / インピーダンス分析 / 電気化学 / 粉末電極 / キャラクタリゼーション / 反応機構 / 電位制御槽 / 鉱物処理

Outline of Research at the Start

電気化学的手法は酸化還元反応を精密測定できるため広く用いられているが、粉末試料の適用は難しく、微量の粉末を定量する手法は確立されていなかった。申請者は、超微量粉末試料の電極を開発し、従来よりはるかに良好な感度を得た。本研究では、超微量粉末電極を多種多様の粉末鉱物に適用し、独自のプログラムを用いた電位を精密に制御する電解槽の開発により、解析が難しかった粉末状の鉱物の浸出・反応機構を解明する。これらの反応機構を鉱物処理・湿式精錬プロセスおよび微生物の高速培養などの場面において応用することを念頭において最適条件を検討する。これらの組み合わせにより、効率よく反応を進めることが出来ると考えられる。

Outline of Final Research Achievements

as new electrochemical technique, super micro powder electrode method has been developed and its characteristics were investigated. this new powder electrode indicates much higher sensitivity and reproducibility compared with conventional massive and mix powder electrodes methods. various minerals such as chalcopyrite, chalcocite, bornite, enargite, tennantite electrodes has been investigated and quantitative analysis and characteristics can be carried out. also application to flotation and hydrometallurgy has been done with quantitative estimation of oxidation and reduction reaction, galvanic current measurements and impedance analysis. these results were presented with various international conference, scientific journal and thesis.

Academic Significance and Societal Importance of the Research Achievements

本研究で確立された超微量粉末電極は、簡便かつ再現性と感度が高く、反応が定量的に評価できるため、鉱物ごとに新しい挙動が得られるなど、貴重な成果が得られている。これらの鉱物が混合した精鉱試料において本法を利用したところ、単独鉱物のボルタモグラムの合計とおおよそ一致し、混合鉱物の定量分析にも応用できた。これまではMLA分析など、時間とコストのかかる方法を使用していたが、この方法は代替法として価値がある。本法の浮遊選別および湿式精錬法への応用として、鉱物表面の酸化還元反応の定量を、ガルバニック電流の測定、インピーダンス分析などを用いて行った。これらは電気化学的手法の新しい可能性を示すものである。

Research Products

• [Journal Article] Bubble interactions with chalcopyrite and molybdenite surfaces in seawater (2020)
  • Author(s): Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Miki Hajime、Sasaki Keiko
  • Journal Title: Minerals Engineering Volume: 157 Pages: 106536-106536
  • DOI: 10.1016/j.mineng.2020.106536
  • Peer Reviewed / Open Access
• [Journal Article] Catalytic mechanism of activated carbon-assisted bioleaching of enargite concentrate (2020)
  • Author(s): Oyama Keishi、Shimada Kazuhiko、Ishibashi Jun-ichiro、Sasaki Keiko、Miki Hajime、Okibe Naoko
  • Journal Title: Hydrometallurgy Volume: 196 Pages: 105417-105417
  • DOI: 10.1016/j.hydromet.2020.105417
  • Peer Reviewed / Open Access
• [Journal Article] Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore (2020)
  • Author(s): Konadu Kojo T.、Sakai Ryotaro、Mendoza Diego M.、Chuaicham Chitiphon、Miki Hajime、Sasaki Keiko
  • Journal Title: Hydrometallurgy Volume: 195 Pages: 105363-105363
  • DOI: 10.1016/j.hydromet.2020.105363
  • Peer Reviewed / Open Access
• [Journal Article] Effect of H2O2 and potassium amyl xanthate on separation of enargite and tennantite from chalcopyrite and bornite using flotation (2020)
  • Author(s): Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Miki Hajime、Sasaki Keiko、Kuroiwa Shigeto、Aoki Yuji
  • Journal Title: Minerals Engineering Volume: 152 Pages: 106371-106371
  • DOI: 10.1016/j.mineng.2020.106371
  • Peer Reviewed / Open Access
• [Journal Article] Selective flotation for removal of impurities on copper concentrates with various redox reactions (2020)
  • Author(s): Miki Hajime、Hirajima Tsuyoshi、Suyantara Gde Pandhe Wisnu、Orii Yuta、Sasaki Keiko、Kuroiwa Shigeto、Aoki Yuji
  • Journal Title: Proceedings of IMPC 2020:XXX International Mineral Processing Congress Volume: 1 Pages: 1434-1442
  • Peer Reviewed
• [Journal Article] The study of selective flotation separation of copper-molybdenite with seawater (2020)
  • Author(s): Semoto Yuki、Suyantara Gde Pandhe Wisnu、Miki Hajime、Sasaki Keiko、Hirajima Tsuyoshi、Aoki Yuji
  • Journal Title: Proceedings of International Symposium on Earth Science and Technology 2020 Volume: 1 Pages: 192-193
  • Peer Reviewed
• [Journal Article] Effect of a sulfite reagent on floatability of chalcopyrite and enargite (2020)
  • Author(s): Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Orii Yuta、Miki Hajime、Sasaki Keiko、Kuroiwa Shigeto、Aoki Yuji
  • Journal Title: Proceedings of IMPC 2020:XXX International Mineral Processing Congress Volume: 1 Pages: 1864-1873
  • Peer Reviewed
• [Journal Article] Comparison on the catalytic mechanism of activated carbon in bioleaching of chalcopyrite and enargite (2019)
  • Author(s): Keishi Oyama, Kyohei Takamatsu, Hajime Miki, Naoko Okibe
  • Journal Title: International Symposium on Earth Science and Technology 2019 Volume: -
  • Peer Reviewed
• [Journal Article] Carbon-assisted bioleaching of primary copper sulfides (2019)
  • Author(s): Keishi Oyama, Kyohei Takamatsu, Hajime Miki, Keiko Sasaki, Naoko Okibe
  • Journal Title: International Biohydrometallurgy Symposium 2019 Volume: -
  • Peer Reviewed
• [Journal Article] Separation of molybdenite and chalcopyrite using various oxidation treatments (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Mitsuru Sawada
  • Journal Title: Proceedings of 10th Copper International Conference Volume: -
  • Peer Reviewed
• [Journal Article] Selective Flotation on Chalcopyrite and Molybdenite with Various Redox Reactions (2019)
  • Author(s): Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki
  • Journal Title: Proceedings of The 15th Internatonal Symposium on East Asian Resources Recycling Technology Volume: -
  • Peer Reviewed
• [Journal Article] Effect of hydrogen peroxide on the separation of copper sulfide minerals and arsenic-bearing copper minerals using flotation (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
  • Journal Title: Proceedings of Flotation'19 International Conference Volume: -
  • Peer Reviewed
• [Journal Article] Effect of seawater on bubble interactions with chalcopyrite and molybdenite surfaces (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
  • Journal Title: Proceedings of Flotation'19 International Conference Volume: -
  • Peer Reviewed
• [Journal Article] Study of selective flotation of copper sulfide and As containing copper minerals (2019)
  • Author(s): Yuta Orii, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Tsuyoshi Hirajima, Shigeto Kuroiwa, Yuji Aoki
  • Journal Title: Proceedings of International Symposium on Earth Science and Technology 2019 Volume: -
  • Peer Reviewed
• [Presentation] 海水でのCu-Mo選択浮遊選別法の開発 (2021)
  • Author(s): 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
  • Organizer: 資源・素材2021年度 春季大会
• [Presentation] 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 (2021)
  • Author(s): 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
  • Organizer: 資源・素材2021年度 春季大会
• [Presentation] Selective flotation for removal of impurities on copper concentrates with various redox reactions (2020)
  • Author(s): Miki Hajime、Hirajima Tsuyoshi、Suyantara Gde Pandhe Wisnu、Orii Yuta、Sasaki Keiko、Kuroiwa Shigeto、Aoki Yuji
  • Organizer: IMPC 2020:XXX International Mineral Processing Congress
  • Int'l Joint Research
• [Presentation] Effect of a sulfite reagent on floatability of chalcopyrite and enargite (2020)
  • Author(s): Suyantara Gde Pandhe Wisnu、Hirajima Tsuyoshi、Orii Yuta、Miki Hajime、Sasaki Keiko、Kuroiwa Shigeto、Aoki Yuji
  • Organizer: IMPC 2020:XXX International Mineral Processing Congress
  • Int'l Joint Research
• [Presentation] The study of selective flotation separation of copper-molybdenite with seawater (2020)
  • Author(s): Semoto Yuki、Suyantara Gde Pandhe Wisnu、Miki Hajime、Sasaki Keiko、Hirajima Tsuyoshi、Aoki Yuji
  • Organizer: International Symposium on Earth Science and Technology 2020
  • Int'l Joint Research
• [Presentation] 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 (2020)
  • Author(s): 瀬元祐希、Gde Pandhe Wisnu Suyantara、三木 一、笹木 圭子、平島剛、青木 悠二
  • Organizer: 一般社団法人資源・素材学会 2020年度 九州支部会
  • Int'l Joint Research
• [Presentation] 難処理性一次硫化銅鉱のバイオリーチングにおける炭素触媒効果とその機構 (2020)
  • Author(s): 小山恵史、高松恭平、青木悠二、黒岩樹人、平島剛、笹木圭子、三木一、沖部奈緒子
  • Organizer: 資源・素材学会春季大会
• [Presentation] 難処理性一次硫化銅鉱のバイオリーチングにおける活性炭添加の影響 (2020)
  • Author(s): 林海人、小山恵史、青木 悠二、黒岩樹人、平島剛、笹木圭子、三木一、沖部奈緒子
  • Organizer: 資源・素材学会春季大会
• [Presentation] 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 (2020)
  • Author(s): 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
  • Organizer: 資源・素材学会春季大会
• [Presentation] 海水を用いたCu-Mo選択浮遊選別に関する研究 (2020)
  • Author(s): 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
  • Organizer: 資源・素材学会春季大会
• [Presentation] Comparison on the catalytic mechanism of activated carbon in bioleaching of chalcopyrite and enargite (2019)
  • Author(s): Keishi Oyama, Kyohei Takamatsu, Hajime Miki, Naoko Okibe
  • Organizer: International Symposium on Earth Science and Technology 2019
  • Int'l Joint Research
• [Presentation] Carbon-assisted bioleaching of primary copper sulfides (2019)
  • Author(s): Keishi Oyama, Kyohei Takamatsu, Hajime Miki, Keiko Sasaki, Naoko Okibe
  • Organizer: International Biohydrometallurgy Symposium 2019
  • Int'l Joint Research
• [Presentation] Separation of molybdenite and chalcopyrite using various oxidation treatments (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Mitsuru Sawada
  • Organizer: Proceedings of 10th Copper International Conference
  • Int'l Joint Research
• [Presentation] Selective Flotation on Chalcopyrite and Molybdenite with Various Redox Reactions (2019)
  • Author(s): Hajime Miki, Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Keiko Sasaki
  • Organizer: Proceedings of The 15th Internatonal Symposium on East Asian Resources Recycling Technology
  • Int'l Joint Research
• [Presentation] Effect of hydrogen peroxide on the separation of copper sulfide minerals and arsenic-bearing copper minerals using flotation (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
  • Organizer: Proceedings of Flotation'19 International Conference
  • Int'l Joint Research
• [Presentation] Effect of seawater on bubble interactions with chalcopyrite and molybdenite surfaces (2019)
  • Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
  • Organizer: Proceedings of Flotation'19 International Conference
  • Int'l Joint Research
• [Presentation] Study of selective flotation of copper sulfide and As containing copper minerals (2019)
  • Author(s): Yuta Orii, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Tsuyoshi Hirajima, Shigeto Kuroiwa, Yuji Aoki
  • Organizer: Proceedings of International Symposium on Earth Science and Technology 2019
  • Int'l Joint Research
• [Presentation] 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 (2019)
  • Author(s): 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
  • Organizer: 資源・素材学会秋季大会
• [Presentation] 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 (2019)
  • Author(s): 折居優太、Gde Pandhe Wisnu Suyantara、三木一、笹木圭子、平島剛
  • Organizer: 資源・素材学会九州支部会
• [Patent(Industrial Property Rights)] 選鉱方法 (2019)
  • Inventor(s): 平島剛,三木一,Gde Suyantara,折居優太,笹木圭子
  • Industrial Property Rights Holder: 平島剛,三木一,Gde Suyantara,折居優太,笹木圭子
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2019-212060
  • Filing Date: 2019