钯
铑
贵金属
洗脱
铂金
浸出(土壤学)
水溶液
化学
无机化学
联氨(抗抑郁剂)
降水
金属
材料科学
冶金
催化作用
色谱法
环境科学
气象学
生物化学
物理
物理化学
土壤科学
土壤水分
作者
Karolina Goc,Joanna Kluczka,Grzegorz Benke,Joanna Malarz,Karolina Pianowska,Katarzyna Leszczyńska-Sejda
出处
期刊:Minerals
[Multidisciplinary Digital Publishing Institute]
日期:2024-06-19
卷期号:14 (6): 625-625
摘要
Precious metals have long been considered as critical raw materials in many countries. There is a growing emphasis on recovering these metals from secondary sources such as automotive catalysts or WEEE (waste of electrical and electronic equipment). During the leaching process of these materials, solutions with low concentrations of precious metals are obtained, which necessitates the use of ion-exchange methods. Following sorption and elution, a post-elution solution called eluate is produced, containing precious metals and no impurities. This eluate must undergo further processing to obtain pure metals or its compounds. The objective of this study was to explore the feasibility of recovering precious metals from post-elution solutions through cementation, reduction, precipitation, or refining techniques. The analysis of the research results indicated that metallic zinc powder is the most effective cementing agent for platinum, palladium, rhodium, and gold. Metallic aluminum and copper powders can selectively cement gold and palladium, separating them from platinum and rhodium. Aqueous hydrazine hydrate solution is the best-reducing agent for precious metals, while an aqueous hydrogen peroxide solution can selectively reduce platinum and palladium, separating them from gold and rhodium.
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