利用铜片置换法回收含银废液中银的工艺实践  

Study on the Process of Purifying Silver Waste Liquid by Copper Sheet Replacement Method

作　　者：郑学军 王涵睿 史智锋 董蔚 孟志军 贺慧 蔡兴顺 ZHENG Xuejun;WANG Hanrui;SHI Zhifeng;DONG Wei;MENG Zhijun;HE Hui;CAI Xingshun(Western Metal Materials Co.,Ltd.,Xi'an 710201,China;Xi'an Noble Rare Metal Materials Co.,Ltd.,Xi'an 710201,China)

机构地区：[1]西部金属材料股份有限公司,陕西西安710201 [2]西安诺博尔稀贵金属材料股份有限公司,陕西西安710201

出　　处：《中国材料进展》2020年第10期787-789,共3页Materials China

摘　　要：近来,低成本、高效率的绿色回收技术应用于含银废液的净化,已经成为二次资源回收领域的热点研究方向之一。针对银电解精炼过程产生的含银废液,拟采用铜片置换技术,利用金属铜作为阳极基底,与废液中贵金属银离子组成氧化还原体系,在不添加其他化学试剂的情况下,使置换出的银粉从铜片剥落,实现银与其他杂质的分离,可应用于含银废液的净化。结果表明,溶液pH值的降低有利于置换反应的进行,延长反应时间可使得置换反应进行完全,升高温度可以加快置换反应速率,采用该工艺,银的回收率可达99.7%,所置换出的银粉,纯度≥98.5%,可以实现废液中银的回收。Recently,low-cost and high efficiency recovery technology has been applied to the purification of silver-containing waste liquid,which has become one of the hotpots in the field of secondary resource recovery.This research is aimed at Ag replacement from the silver-containing waste liquid produced in the electrolytic refining of silver by copper replacement method,using metal copper as the anode substrate,and the noble metal silver ions in the waste liquid to form a redox system.No chemical reagents is added to the replacement reaction.The results show that the decrease of the solution pH value is conducive to the replacement reaction,extending the reaction time can make the replacement reaction complete,increasing the temperature can accelerate the replacement reaction rate.On the basis of optimum condition,recovery rate of silver can reach 99.7% and silver purity reaches ≥98.5%.This method can be successfully applied to the recovery of silver from the waste liquid.

关 键 词：铜置换 含银废液 回收 硝酸介质 

分 类 号：TF832[冶金工程—有色金属冶金]