银电解液净化渣中银和铜的分离回收  

Study on separation of copper and silver from purification residue of silver electrolyte

作　　者：赵祝鹏 张善辉 崔家友 张腾 贺东晓 ZHAO Zhupeng;ZHANG Shanhui;CUI Jiayou;ZHANG Teng;HE Dongxiao(Shandong Humon Smelting Co.,Ltd.,Yantai 264109,China)

机构地区：[1]山东恒邦冶炼股份有限公司,山东烟台264109

出　　处：《中国有色冶金》2023年第1期41-45,共5页China Nonferrous Metallurgy

基　　金：国家重点研发计划项目“铜冶炼危废源头减量及全过程控制技术与示范”(2018YFC1900300)。

摘　　要：银电解液净化过程中产生的净化渣中铜含量较高,采用火法工艺处理,存在除铜周期长、金银直收率低的问题,而且产生的含金银烟灰需要二次处理,增加了处理成本。本文探索使用硫酸法处理银电解液净化过程中产生的净化渣。结果表明,采用硫酸法湿法工艺处理净化渣,控制硫酸浓度6%、反应温度75℃、反应时间2 h、液固比5∶1、食盐加入量为27.5 kg/t的条件,净化渣中铜的浸出率可达到99%以上,反应后液中银含量降到0.5 mg/L。生产实践中,浸出渣中银含量可稳定在70%以上,铜含量为0.4%以下,实现了银铜的分离。相较于传统处理工艺,本工艺具有操作简单,且具有良好的经济与环保效益。The purification slag produced in the purification process of silver electrolyte has a high copper content.There are the features of long copper removal period,low gold and silver direct yield in the traditional pyrotechnic process and the generated soot containing gold and silver needs secondary treatment,which increases the treatment cost for the treatment of purification slag.In this paper,sulfuric acid method was used to treat the purification residue produced in the purification process of silver electrolyte.The results showed that the leaching rate of copper could reach more than 99%and the silver content in the solution could be reduced to 0.5 mg/L by sulfuric acid wet process with sulfuric acid concentration of 6%,reaction temperature of 75℃,reaction time of 2 h,liquid-solid ratio of 5∶1,and salt dosage of 11 g.The separation of silver and copper was realized and the silver content in the leaching residue could be stabilized at more than 70%and the copper content was less than 0.4%by the production process application.Compared with the traditional treatment process,this process has the advantages of simple operation and good economic and environmental benefits.

关 键 词：银电解液 净化渣 铜 硫酸 银 湿法工艺 

分 类 号：X758[环境科学与工程—环境工程] TF832[冶金工程—有色金属冶金] TF811