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作者研究了用生物浸溶使难溶黄铁矿精矿预先氧化的方法来提高氰化阶段金和银的回收率后,提出了三个不同精矿的实验室试验结果。在所有的实验中,精矿经预处理后,贵金属的回收率都有很大提高。就其中一个精矿来说,87%的黄铁矿被氧化后,金的回收率达到81%;而该精矿直接氰化(未经预先氧化)的回收率仅24%。其余两个精矿金和银的回收率分别从60—78%增加到90%以上和从80～86%到98%以上。本文还讨论生物氧化的操作参数和评价维持高氧化速度的方法。此外,也描述在工业生产中使用该工艺的途径。
The authors studied the experimental results of three different concentrates after improving the recovery of gold and silver in the cyanidation stage by pre-oxidation of the insoluble pyrite concentrate with biological leaching. In all experiments, the recovery of precious metals has been greatly increased after the concentrate has been pretreated. For one of the concentrates, 87% of the pyrite was oxidized and the recovery of gold reached 81%. The recovery of direct cyanidation of the concentrate (without pre-oxidation) was only 24%. The recoveries of the remaining two concentrate gold and silver increased from 60-78% to over 90% and from 80-86% to 98% respectively. This article also discusses the operational parameters of biooxidation and the method of evaluating the rate of maintenance of high oxidation. In addition, ways to use the process in industrial production are also described.