A green and economical process for resource recovery from precious metals enriched residue of copper anode slime

浸出(土壤学) 资源回收 化学 柠檬酸 残留物(化学) 渗滤液 试剂 核化学 废水 环境化学 环境科学 环境工程 有机化学 土壤科学 土壤水分
作者
Jinchan Xian,Ning Zhu,Wuyang Zhu,Jing Wang,Pingxiao Wu
出处
期刊:Journal of Cleaner Production [Elsevier]
卷期号:369: 133341-133341 被引量:4
标识
DOI:10.1016/j.jclepro.2022.133341
摘要

The precious metals enriched residue of copper anode slime (PM-CAS) obtained from our previous study, creates favorable conditions for recycling resource. In this study, a green and economical process for resource recovery from PM-CAS is proposed. Results showed that 99.70% Ag and 98.65% Pd were successfully leached in 10 min by HNO3-citric acid under optimized conditions with 99.81% Au retained in the residue. The reason could be the boosting effects came from the phase transition of PM-CAS and the enhanced leaching driving force by coupling HNO3 and citric acid. It was found that NaCl precipitation with glucose reduction could recover 99.99% Ag with a purity of 99.99% from the leachate under preferred conditions. Meanwhile, 99.90% Pd could be easily recovered from the Ag-separated solution by the previously recycled Cu powder (RCu). In addition, 98.16% Au was recovered from the Au-retained residue by 1.0 mol/L HCl and 8.0 g/L KClO3 leaching and RCu reduction. Comparably, the process could achieve the total recovery efficiencies of 99.69% Ag, 98.55% Pd, and 97.97% Au with cheaper and lower concentration reagents and RCu, which was promising to obtain a net profit of about $250,857/ton of PM-CAS. Therefore, the proposed process could be a potential choice for green and economical resource recovery from PM-CAS.
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