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.

中文翻译：

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金的强烈氰化反应中氧化剂的作用。二.硫化物矿物氧化


在重选金精矿的强化氰化过程中，常采用间硝基苯磺酸钠（NBS）作为过程中的氧化剂补充溶解氧。之前的一篇论文介绍了金氰化过程中 NBS 行为的电化学研究结果。结果证实NBS在金的氰化反应中起到氧化剂的作用，并且混合电位模型可以用来描述其作用机制。本文探讨了金精矿中不可避免地含有的硫化物矿物通过溶解氧或 NBS 的相应氧化。使用电化学技术发现，在 pH 值 9 至 11 之间时，溶解氧可有效氧化多种硫化物矿物。氰化物对阳极和阴极过程的影响已被研究。已发现，即使在氰化物存在的情况下，NBS 作为除方铅矿之外的所有测试矿物的氧化剂都是无效的。