文章信息/Info

Title:

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

文章編號:

1674-3962(2020)10-0787-03

作者:

鄭學軍1; 2; 王涵睿2; 史智鋒2; 董蔚2; 孟志軍2; 賀慧2; 蔡興順2

（1. 西部金屬材料股份有限公司，陜西 西安 710201）（2. 西安諾博爾稀貴金屬材料股份有限公司，陜西 西安 710201）

Author(s):

ZHENG Xuejun1; 2; WANG Hanrui2; SHI Zhifeng 2; DONG Wei2;  MENG Zhijun2; HE Hui2; CAI Xingshun2

(1. Western Metal Materials Co., Ltd., Xi’an 710201, China) （2. Xi’an Noble Rare Metal Materials Co., Ltd., Xi’an 710201, China)

關鍵詞:

銅置換; 含銀廢液; 回收; 硝酸介質

Keywords:

Cu replacement method;  silver waste liquid;  recovery;  nitric acid medium

分類號:

TF832

DOI:

10.7502/j.issn.1674-3962.202007004

文獻標志碼:

A

摘要:

近來，低成本、高效率的綠色回收技術應用于含銀廢液的凈化，已經成為二次資源回收領域的熱點研究方向之一。針對銀電解精煉過程產生的含銀廢液，擬采用銅片置換技術，利用金屬銅作為陽極基底，與廢液中貴金屬銀離子組成氧化還原體系，在不添加其他化學試劑的情況下，使置換出的銀粉從銅片剝落，實現銀與其他雜質的分離，可應用于含銀廢液的凈化。結果表明，溶液pH值的降低有利于置換反應的進行，延長反應時間可使得置換反應進行完全，升高溫度可以加快置換反應速率，采用該工藝，銀的回收率可達99.7%，所置換出的銀粉，純度≥98.5%，可以實現廢液中銀的回收。

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.