• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Redox Controlled Chalcopyrite Leaching as a New Method for Copper Production

Research Project

Project/Area Number 13450412
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

TSUNEKAWA Masami  Hokkaido Univ., Grad. School. of Eng., Pro., 大学院・工学研究科, 教授 (40002026)

Co-Investigator(Kenkyū-buntansha) HIROYOSHI Naoki  Hokkaido Univ., Grad. School. of Eng., Inst., 大学院・工学研究科, 助手 (50250486)
HIRAJIMA Tsuyoshi  Hokkaido Univ., Grad. School. of Eng., Asso. Pro., 大学院・工学研究科, 助教授 (00175556)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 2001: ¥6,600,000 (Direct Cost: ¥6,600,000)
KeywordsChalcopyrite / Leaching / Oxidation / Reduction / Redox Potential / Catalyst / Copper / Bacteria / 酸化溶解 / 活性態 / 不働態 / 電解 / 電位 / 金属イオン / 活性炭 / 鉄酸化細菌 / 酸化還元 / 活性化 / インピーダンス / アノード溶解
Research Abstract

Heap leaching of low-grade copper ore, combined with solvent-extraction/electro-winning, has become important in copper production, because of its low capital and operation costs, operational simplicity However, the process has not been fully successful, due to the extremely slow leaching kinetics of a common copper source, chalcopyrite (CuFeS_2). Chalcopyrite leaching is a redox process and the control of the redox potential determined by the concentration ration of oxidant ferric ion to reductant ferrous ion has been proposed to improve the leaching rate. In this study, the redox potential dependence of chalcopyrite leaching in sulfuric acid solutions and the factors affecting the potential dependence of the leaching were investigated to establish the redox controlled chalcopyrite leaching. Leaching and anodic-polarization experiments showed that coexistence of cupric and ferrous ions activate anodic dissolution of chalcopyrite, causing faster copper extraction at the potentials below a certain value (critical potential). The analysis of the AC impedance spectra for chalcopyrite electrode indicated that a high-resistance passive layer grows on the chalcopyrite surface without cupric and/or ferrous ions, and that coexistence of these ions causes a formation of another product layer and inhibits the passive layer growth at low potentials. These results are explained by a reaction model assuming the formation of intermediate Cu_2S due to chalcopyrite reduction and the subsequent oxidation of the Cu_2S. The critical potential corresponds to the redox potential of the Cu_2S formation and the predicted values matched with the experimental results, and the optimum redox potential for chalcopyrite dissolution is a function of cupric and ferrous ion concentrations. Effects of catalysts like silver ions and activated carbon on chalcopyrite leaching were also explained based on the above model.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] N.Hiroyoshi, H.Miki, T.Hirajima, M.Tsunekawa: "Enhancement of Chalcopyrite Leaching by Ferrous Ions in Acidic Ferric Sulfate Solutions"Hydrometallurgy. 60(3). 185-197 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, M.Arai, H.Miki, M.Tsunekawa, T.Hirajima: "A New Reaction Model for the Catalytic Effect of Silver Ions on Chalcopyrite Leaching in Sulfuric Acid Solutions"Hydrometallurgy. 63(3). 257-267 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, M.Tsunekawa, T.Hirajima: "Redox Potential Dependence of Chalcopyrite Leaching"Proceedings of 22th International Mineral Processing Congress. 1203-1213 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Miki, N.Hiroyoshi, S.Kuroiwa, M.Tsunekawa, T.Hirajima: "Mechanisms of Catalytic Leaching of Chalcopyrite"Proc.Copper03-Cobre03 Inter.Conf. Vol.VI. 383-394 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, S.Kuroiwa, H.Miki, M.Tsunekawa, T.Hirajima: "Synergistic Effect of Cupric and Ferrous Ions on Active-Passive behavior in Anodic Dissolution of Chalcopyrite in Sulfuric Acid Solutions"Hydrometallurgy. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, H.Miki, T.Hirajima, M.Tsunekawa: "Enhancement of Chalcopyrite Leaching by Ferrous Ions in Acidic Ferric Sulfate Solutions"Hydrometallurgy. 60,3. 185-197 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, M.Arai, H.Mild, M.Tsunekawa, T.Hirajima: "A New Reaction Model for the Catalytic Effect of Silver Ions on Chalcopyrite Leaching in Sulfuric Acid Solutions"Hydrometallurgy. 63. 257-267 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, M.Tsunekawa, T.Hirajima: "Redox Potential Dependence of Chalcopyrite Leaching"Proceedings of 22th International Mineral Processing Congress. 1203-1213 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Miki, N.Hiroyoshi, S.Kuroiwa, M.Tsunekawa, T.Hirajima: "Mechanisms of Catalytic Leaching of Chalcopyrite"Proc.Copper03-Cobre03 Inter.Conf.. Vol.VI. 383-394 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Hiroyoshi, S.Kuroiwa, H.Miki, M.Tsunekawa, T.Hirajima: "Synergistic Effect of Cupric and Ferrous Ions on Active-Passive behavior in Anodic Dissolution of Chalcopyrite in Sulfuric Acid Solutions"Hydrometallurgy. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Hiroyoshi, M.Tsunekawa, T.Hirajima: "Redox Potential Dependence of Chalcopyrite Leaching"Proceedings of 22th International Mineral Processing Congress. 1203-1213 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Miki, N.Hiroyoshi, S.Kuroiwa, M.Tsunekawa, T.Hirajima: "Mechanisms of Catalytic Leaching of Chalcopyrite"Proc.,Copper03-Cobre03 Inter.Conf.. Vol.VI. 383-394 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] N.Hiroyoshi, S.Kuroiwa, H.Miki, M.Tsunekawa, T.Hirajima: "Synergistic Effect of Cupric and Ferrous Ions on Active-Passive behavior in Anodic Dissolution of Chalcopyrite in Sulfuric Acid Solutions"Hydrometallurgy. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 三木 一: "Fe(III)を含む硫酸溶液中における黄銅鉱の回分浸出挙動-溶液酸化還元電位と銅溶出の関係-"資源と素材. 117・3. 215-220 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Naoki Hiroyoshi: "Enhancement of chalcopyrite leaching by ferrous ions in acidic ferric sulfate"Hydrometallurgy. 60・3. 185-197 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Naoki Hiroyoshi: "A new reaction model for the catalytic effect of silver ions on chalcopyrite leaching in sulfuric acid solutions"Hydrometallurgy. 63・3. 257-267 (2002)

    • Related Report
      2001 Annual Research Report

URL: 

Published: 2001-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi