电渗析
化学
铜
硝酸
流出物
无机化学
限制电流
膜
电化学
电极
环境工程
环境科学
生物化学
有机化学
物理化学
作者
Pauline Zimmermann,Karen L. Wahl,Önder Tekinalp,Simon Birger Byremo Solberg,Liyuan Deng,Øivind Wilhelmsen,Odne Stokke Burheim
出处
期刊:Desalination
[Elsevier]
日期:2024-03-01
卷期号:572: 117108-117108
标识
DOI:10.1016/j.desal.2023.117108
摘要
With the growing demand for silver, the recycling of this precious metal from secondary sources has become imperative. However, the presence of copper impurities poses a significant challenge. This study aims to explore electrodialysis for selectively recovering silver ions from copper-contaminated effluents, elucidating the effect of low pH on the process performance. Electrodialysis of 10 mM equimolar solutions of silver nitrate and copper nitrate was performed at various pH levels, using nitric acid for pH adjustment. Adjusting the operational current to the limiting current resulted in similar silver fluxes and copper leakages at pH 1, 2, and 4.5. The energy requirement was governed by proton abundance, competing with silver ions for charge transport in the electrodialysis cell. The specific energy consumption for silver removal decreased from 751 kJ/mol at pH 1 to 36 kJ/mol at pH 4.5, with the energy efficiency rising from 2 % at pH 1 to 37 % at pH 4.5. Copper leakage was approximately 20 % in all cases, yielding silver‑copper separation efficiencies of 55 % at pH 1 and 80 % at pH 2 and 4.5. This study highlights electrodialysis as a promising technique for purifying hydrometallurgical effluents, emphasizing the need for case-specific assessment depending on feed water properties. Notably, the limitations associated with low pH suggest potential advantages of adjusting the pH of the solution.
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