Model for ferrous-promoted chalcopyrite leaching

Naoki Hiroyoshi, Hajime Miki, Tsuyoshi Hirajima, Masami Tsunekawa

研究成果: ジャーナルへの寄稿記事

114 引用 (Scopus)

抄録

Oxidative leaching of chalcopyrite with dissolved oxygen and/or with ferric ions is promoted by high concentrations of ferrous ions in sulfuric acid solutions containing cupric ions. This paper proposes a reaction model to interpret this phenomenon and the thermodynamics of the leaching is discussed. The model considers the leaching to take place in two steps: (1) reduction of chalcopyrite to Cu2S by ferrous ions in the presence of cupric ions and (2) oxidation of the Cu2S to cupric ions and elemental sulfur by dissolved oxygen and/or by ferric ions. The intermediate Cu2S is more amenable to oxidation than chalcopyrite, causing enhanced copper extraction. The model predicts that the formation of intermediate Cu2S and ferrous-promoted chalcopyrite leaching occur when the redox potential of the solution is below a critical potential that is a function of the ferrous and cupric ion concentrations. To confirm this, flask-shaking leaching experiments were carried out with 0.1 mol dm-3 sulfuric acid solutions containing known concentrations of ferrous, ferric, and cupric ions at 303 K in air. The results agreed well with the predictions, i.e. copper extraction was enhanced at solution potentials below the critical potential predicted with the model.

元の言語英語
ページ(範囲)31-38
ページ数8
ジャーナルHydrometallurgy
57
発行部数1
DOI
出版物ステータス出版済み - 8 2000

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Leaching
Ions
Dissolved oxygen
Sulfuric acid
Copper
chalcopyrite
Oxidation
Sulfur
Thermodynamics
Air

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

Model for ferrous-promoted chalcopyrite leaching. / Hiroyoshi, Naoki; Miki, Hajime; Hirajima, Tsuyoshi; Tsunekawa, Masami.

:: Hydrometallurgy, 巻 57, 番号 1, 08.2000, p. 31-38.

研究成果: ジャーナルへの寄稿記事

Hiroyoshi, N, Miki, H, Hirajima, T & Tsunekawa, M 2000, 'Model for ferrous-promoted chalcopyrite leaching', Hydrometallurgy, 巻. 57, 番号 1, pp. 31-38. https://doi.org/10.1016/S0304-386X(00)00089-X
Hiroyoshi, Naoki ; Miki, Hajime ; Hirajima, Tsuyoshi ; Tsunekawa, Masami. / Model for ferrous-promoted chalcopyrite leaching. :: Hydrometallurgy. 2000 ; 巻 57, 番号 1. pp. 31-38.
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AB - Oxidative leaching of chalcopyrite with dissolved oxygen and/or with ferric ions is promoted by high concentrations of ferrous ions in sulfuric acid solutions containing cupric ions. This paper proposes a reaction model to interpret this phenomenon and the thermodynamics of the leaching is discussed. The model considers the leaching to take place in two steps: (1) reduction of chalcopyrite to Cu2S by ferrous ions in the presence of cupric ions and (2) oxidation of the Cu2S to cupric ions and elemental sulfur by dissolved oxygen and/or by ferric ions. The intermediate Cu2S is more amenable to oxidation than chalcopyrite, causing enhanced copper extraction. The model predicts that the formation of intermediate Cu2S and ferrous-promoted chalcopyrite leaching occur when the redox potential of the solution is below a critical potential that is a function of the ferrous and cupric ion concentrations. To confirm this, flask-shaking leaching experiments were carried out with 0.1 mol dm-3 sulfuric acid solutions containing known concentrations of ferrous, ferric, and cupric ions at 303 K in air. The results agreed well with the predictions, i.e. copper extraction was enhanced at solution potentials below the critical potential predicted with the model.

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