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J Hazard Mater. 2010 May 15;177(1-3):377-83. doi: 10.1016/j.jhazmat.2009.12.042. Epub 2009 Dec 14.

Recovery of high-purity silver directly from dilute effluents by an emulsion liquid membrane-crystallization process.

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  • 1Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. renytang@163.com

Abstract

An emulsion liquid membrane (ELM)-crystallization process, using hypophosphorous acid as a reducing agent in the internal aqueous phase, has been developed for the purpose of recovering high-purity silver directly from dilute industrial effluents (waste rinse water). After pretreatment with HNO(3), silver in waste rinse water can be reliably recovered with high efficiency through the established process. The main parameters in the process of ELM-crystallization include the concentration of carrier in the membrane phase, the concentration of reducing agent in the internal aqueous phase, and the treatment ratio, which influence the recovery efficiency to various extents and must be controlled carefully. The results indicated that more than 99.5% (wt.) of the silver ions in the external aqueous phase were extracted by the ELM-crystallization process, with an average efficiency of recovery of 99.24% (wt.) and a purity of 99.92% (wt.). The membrane phase can be used repeatedly without loss of the efficiency of recovery.

Copyright (c) 2009 Elsevier B.V. All rights reserved.

PMID:
20045246
[PubMed - indexed for MEDLINE]
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