The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions

Hajime Miki, Michael Nicol

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

17 引用 (Scopus)

抜粋

An alternative approach to the heap leaching of copper sulfide minerals involves the use of chloride ions as the lixiviant. The facile oxidation of copper(I) ions in a chloride system by atmospheric oxygen offers an alternative to bio-oxidation of iron(II) in the sulfate system. In the chloride system, it is well-known that both copper(II) and iron(III) ions can act as the oxidants for these minerals. However, regeneration of these species by oxidation with dissolved oxygen is required and this is possible in a sulfate system by the use of bacterially catalysed oxidation of iron(II). However, in the chloride system, re-oxidation of copper(I) and iron(II) ions can only economically be achieved by chemical reaction with dissolved oxygen. The kinetics of the reduction of dissolved oxygen by iron(II) and copper(I) in acidic chloride solutions have been previously studied with the former being considerably slower than the latter. This paper will focus on the kinetics of the copper-catalysed reaction of iron(II) with dissolved oxygen. It will be shown that this reaction can be described in terms of the rapid equilibrium Fe(II) + Cu(II) ⇆ Fe(III) + Cu(I) followed by relatively rapid auto-oxidation of copper(I). The inhibiting effect of iron(III) ions in terms of the above equilibrium is demonstrated and the effects of acidity and chloride ion concentration on the rate described. An overall kinetic model has been developed which is consistent with the published data on the individual reactions involved in this mechanism. The application of this model to the prediction of maximum possible leach rates for copper sulfide minerals in aerated systems under ambient conditions is discussed.

元の言語英語
ホスト出版物のタイトルHydrometallurgy 2008: Proceedings of the 6th International Symposium
ページ971-979
ページ数9
出版物ステータス出版済み - 2008
外部発表Yes
イベントHydrometallurgy 2008: 6th International Symposium - Phoenix, AZ, 米国
継続期間: 8 17 20088 21 2008

その他

その他Hydrometallurgy 2008: 6th International Symposium
米国
Phoenix, AZ
期間8/17/088/21/08

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Metals and Alloys

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  • これを引用

    Miki, H., & Nicol, M. (2008). The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions. : Hydrometallurgy 2008: Proceedings of the 6th International Symposium (pp. 971-979)