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

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

Issue:
2020年第10期
Page:
787-789
Research Field:
Publishing date:

Info

Title:
Study on the Process of Purifying Silver Waste Liquid by Copper Sheet Replacement Method
Author(s):
ZHENG Xuejun12WANG Hanrui2SHI Zhifeng 2DONG Wei2 MENG Zhijun2HE Hui2CAI Xingshun2
(1. Western Metal Materials Co., Ltd., Xi’an 710201, China) (2. Xi’an Noble Rare Metal Materials Co., Ltd., Xi’an 710201, China)
Keywords:
Cu replacement method silver waste liquid recovery nitric acid medium
CLC:

PACS:
TF832
DOI:
10.7502/j.issn.1674-3962.202007004
DocumentCode:

Abstract:
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.

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Last Update: 2020-10-11