低酸浸铜、高酸除杂两段酸浸提高金银回收率工艺研究  

Improvement of gold and silver recovery by two stage acid leaching–weak acid leaching to remove copper and strong acid leaching to remove impurity

作　　者：邱建森 QIU Jian-sen(Zijin Copper Co.,Ltd.,Key Laboratory of Copper Green Production and comprehensive utilization of associated resources in Fujian Province,Shanghang 364204,Fujian,China)

机构地区：[1]紫金铜业有限公司,福建省铜绿色生产及伴生资源综合利用重点实验室,福建上杭364204

出　　处：《世界有色金属》2021年第22期132-135,共4页World Nonferrous Metals

摘　　要：针对某黄金冶炼厂存在的金精矿强化硫酸化焙烧造成金浸出率下降的工艺难题,通过对酸浸工艺的优化,将一段酸浸工序变更设计为一段低酸浸铜、二段高酸除杂两段酸浸工艺,着重探索了高酸除杂过程中硫酸浓度、酸浸温度、酸浸时间、矿浆浓度、过滤洗涤效果等条件因子的影响,研究表明:焙砂经一段低酸浸铜(常规酸浸)工序处理后,控制矿浆浓度约45%,硫酸初始浓度约10%,酸浸温度90℃,搅拌2h进行高酸除杂,可提高金氰化浸出率1.5%~5%,提高银氰化浸出率2%~6%,且可有效避免高酸度对铜萃取效果的不利影响,取得良好效果。Aiming at the technical difficulty facing a gold smelter which has led to low gold recovery from concentrate by sulfuric acid leaching,this paper explores ways for technology improvement.Initial weak acid leaching for copper,followed by strong acid leaching to remove impurities are proposed,with special focus on sulfuric acid concentration,leaching temperature,leaching time,pulp density and filtration efficiency during strong acid leaching.After a period of weak acid leaching(conventional acid leaching),control of pulp density to about 45%,initial sulphuric acid concentration about 10%,acid leaching temperature 90℃for 2 hours to remove impurity,gold cyanidation increased by 1.5%~5%,silver leaching increased by 2%~6%.The negative impact of the high acidity on copper extraction was effectively avoided.

关 键 词：金 银 硫酸化焙烧 两段酸浸 氰化 

分 类 号：TD952[矿业工程—选矿]