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目前,黄金矿山生产的氰化金泥,含铜量差异很悬殊.有的含铜2～5%左右和少量的铅,采用单一硫酸浸出,基本上能达到除铜和其他杂质的要求.含铜10～15%的金泥,采用单一硫酸浸出时,除铜不彻底.我矿成功的应用了硝酸铵和硫酸混合浸出,除铜效果好,已经应用于生产.金泥酸浸的目的是降低成本,保证产品质量,提高冶炼回收率.金泥不进行酸浸时,冶炼成本每公斤金高达50～60元,直接回收率达92～93%左右.应用混合酸浸成本为每公斤黄金降低25元,冶炼回收率提高到99.6%.
At present, the gold mines produced by gold mines have very different copper contents, some of which contain about 2 to 5% of copper and a small amount of lead, which can basically achieve the requirements of removing copper and other impurities by using single sulfuric acid leaching. 10 ~ 15% of gold mud, the use of a single sulfuric acid leaching, the removal of copper is not complete.I mine the successful application of a mixture of ammonium nitrate and sulfuric acid leaching, copper removal effect is good, has been used in the production of gold mud acid leaching is to reduce costs, Ensure the quality of the products and improve the smelting recovery rate.When the gold mud is not acid leaching, the cost of smelting is as high as 50-60 yuan per kilogram of gold and the direct recovery rate is about 92-93% .The cost of mixed acid leaching is reduced by 25 yuan per kilogram of gold, Smelting recovery rate increased to 99.6%.