Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C

被引：19

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 Fisicoquim, Escuela Ingn Met & Ciencia Mat, Bucaramanga, Colombia

来源：

INTERNATIONAL JOURNAL OF MINERAL PROCESSING | 2009年 / 92卷 / 3-4期

关键词：

Silver catalysis; Chalcopyrite; Ferric leaching; Temperature; Oxygen; OXIDATION; DISSOLUTION; MINERALS; ION;

D O I：

10.1016/j.minpro.2009.03.007

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The influence of silver and iron concentration and the presence or absence of oxygen was investigated in the silver-catalyzed chalcopyrite leaching. The leaching tests were performed at two different temperatures (35 and 68 degrees C) in stirred flasks (180 rpm) containing 0.5 g of mineral and 100 mL of Fe3+/Fe2+ sulphate solutions at pH 1.8 and at an initial redox potential of 500 mV vs. Ag/AgCl. The addition of a great excess of silver favoured the transformation of chalcopyrite into copper-rich sulphides, such as: covellite, CuS, and geerite, Cu8S5. These sulphides prevented the formation of CuFeS2/Ag2S galvanic couple and, thus, the regeneration of silver. In addition, oxygen in solution plays a key role in the regeneration of silver ions acting as the main oxidizing agent for Ag2S. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：137 / 143

页数：7

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