The role of oxidants in the intensive cyanidation of gold. II. Sulfide mineral oxidation

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2024-07-14 DOI:10.1016/j.hydromet.2024.106364

M. Nicol , W.P. Staunton , T. McGrath

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Abstract

In the intensive cyanidation of gravity gold concentrates, sodium m-nitrobenzene sulfonate (NBS) is often used to supplement dissolved oxygen as the oxidant in the process. A previous paper presented the results of a largely electrochemical study of the behaviour of NBS during cyanidation of gold. The results confirmed that NBS acts as an oxidant in the cyanidation of gold and that the mixed potential model can be applied to describe the mechanism of its action. This paper explores the corresponding oxidation of sulfide minerals, that inevitably are contained in gold concentrates, by either dissolved oxygen or NBS. Using electrochemical techniques it was found that dissolved oxygen is effective in the oxidation of several sulfide minerals at pH values between 9 and 11. The effect of cyanide on both the anodic and cathodic processes has been studied. NBS has been found to be ineffective as an oxidant for all minerals tested except galena, even in the presence of cyanide.

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氧化剂在黄金强化氰化中的作用。II.硫化物矿物氧化

在重力金精矿的强化氰化过程中，间硝基苯磺酸钠（NBS）通常被用来补充作为氧化剂的溶解氧。之前的一篇论文介绍了对 NBS 在黄金氰化过程中的行为进行电化学研究的结果。研究结果证实，NBS 在金的氰化过程中起氧化剂的作用，而且混合电位模型可用于描述其作用机理。本文探讨了金精矿中不可避免含有的硫化物矿物在溶解氧或 NBS 作用下的相应氧化过程。利用电化学技术发现，在 pH 值介于 9 和 11 之间的条件下，溶解氧可有效氧化多种硫化矿物。还研究了氰化物对阳极和阴极过程的影响。发现 NBS 作为氧化剂对除方铅矿以外的所有测试矿物都无效，即使在氰化物存在的情况下也是如此。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.