Ammoniacal thiosulphate leaching of gold in the presence of pyrite

被引：54

作者：

Feng, D. ^{[1
]}

van Deventer, J. S. J. ^{[1
]}

机构：

[1] Univ Melbourne, Dept Chem Engn, Melbourne, Vic 3010, Australia

来源：

HYDROMETALLURGY | 2006年 / 82卷 / 3-4期

基金：

澳大利亚研究理事会;

关键词：

gold leaching; thiosulphate; pyrite; passivation;

D O I：

10.1016/j.hydromet.2006.03.006

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of pyrite on gold dissolution was investigated in the ammoniacal thiosulphate leaching system using pure gold foils. Special emphasis was placed on gold leaching in association with pyrite dissolution, thiosulphate decomposition and gold leaching passivation. The presence of pyrite retarded gold dissolution and this detrimental effect became more pronounced at higher pyrite contents. Pyrite catalysed the decomposition of thiosulphate to trithionate. The addition of sulphate enhanced gold leaching by retarding the dissolution of pyrite in ammoniacal thiosulphate solutions. XPS analysis indicated the presence of iron hydroxide species at the gold surfaces in the presence of pyrite, which was likely responsible for the reduced gold dissolution. SEM analysis indicated a lesser extent of gold dissolution occurring in the presence of pyrite. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：126 / 132

页数：7

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