富贵锑控电位氯化浸出选择性分离贱金属

Selectively separating base metals from noble antimony by chlorination leaching with controlling potential

为实现从富贵锑中富集提取金的目的,提出采用控电位氯化浸出方法选择性分离富贵锑中贱金属。详细考察了各因素对贱金属浸出率的影响,查明了最优条件下贵金属的溶解行为,采用富贵锑粉置换回收浸出液中的贵金属。结果表明:提高盐酸浓度、增加液固比、提高反应温度和减小双氧水的加入速度均可以提高贱金属的浸出率;但增大双氧水过量系数会导致金属氧化沉淀。在最优条件下,铜、镍、锑和铅的浸出率均大于99.0%,金和银的浸出率分别为0.16%和84.40%,浸出渣中金含量达到96.0%。浸出液冷却结晶过程会析出氯化铅,金和银的置换率均达到99.0%以上。该方法实现了富贵锑中贱金属有效分离和金高效富集的双重目的。

In order to enrich gold from noble antimony, chlorination leaching with controlling potential was proposed to selectively separate base metals from noble antimony. The effects of various factors on the leaching rate of base metals were investigated. The precious metals in leachate were replaced by noble antimony. And the optimal conditions were gotten. The results show that increasing the concentration of HCl, the liquid-solid ratio and reaction temperature, and decreasing the adding rate of H2O2 are helpful for the base metal leaching. However, increasing the excess coefficient of H2O2 can lead to the metal oxidizing sedimentation. Under the optimal conditions, the leaching rates of Cu, Ni, Sb and Pb reach more than 99%, respectively, the leaching rates of gold and silver are 0.16% and 84.40%, respectively, and the content of gold in residue is 96.0%. PbCl2 precipitated after leaching solution cools and the replacement rate of gold and silver reaches more than 99.0%. The method achieves the dual purpose that effectively separating of base metals and enriching gold from noble antimony.