Leaching of chalcopyrite with ferric ion.: Part IV:: The role of redox potential in the presence of mesophilic and thermophilic bacteria

被引：83

作者：

Cordoba, E. M. ^{[2
]}

Munoz, J. A. ^{[1
]}

Blazquez, M. L. ^{[1
]}

Gonzalez, F. ^{[1
]}

Ballester, A. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Ciencias Quim, Dept Ciencia Mat & Ingn Met, E-28040 Madrid, Spain

[2] Univ Ind Santander, Fac Ingn, Escuela Ingn Met & Ciencia Mat, Bucaramanga, Colombia

来源：

HYDROMETALLURGY | 2008年 / 93卷 / 3-4期

关键词：

D O I：

10.1016/j.hydromet.2007.11.005

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This paper reports a study on the effect of redox potential in chalcopyrite bioleaching in the presence of iron- and sulphur-oxidizing bacteria. Bioleaching tests were carried out in stirred Erlenmeyer flasks at 180 rpm, with 0.5 g of chalcopyrite mineral, 99 ml of a sulphate solution of Fe3+/Fe2+ (with the redox potential ranging between 300 and 600 mVAg/AgCl) at pH 1.8 and 1 ml of a mesophilic (35 degrees C) or thermophilic (68 degrees C) culture. The overoxidation of the leaching solution, due to the activity of iron-oxidizing microorganisms (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans and Sulfolobus BC), favoured the precipitation of jarosite on chalcopyrite surfaces followed by passivation. Iron- and sulphur-oxidizing microorganisms, such as A. ferrooxidans and Sulfolobus BC adapted for 4 months to elemental sulphur as the sole energy source, recovered their iron-oxidizing ability after being contact with Fe2+. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：106 / 115

页数：10

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