Silver recovery from synthetic photographic X-ray process effluents using activated and medical carbon

被引：31

作者：

Adani, KG ^{[1
]}

Barley, RW ^{[1
]}

Pascoe, RD ^{[1
]}

机构：

[1] Univ Exeter, Sch Geog, Camborne Sch Mines, Sch Geog Archaeol & Earth Sci, Penryn TR10 9EZ, Cornwall, England

来源：

MINERALS ENGINEERING | 2005年 / 18卷 / 13-14期

关键词：

hydrometallurgy; waste processing; activated carbon; silver;

D O I：

10.1016/j.mineng.2005.05.021

中图分类号：

TQ [化学工业];

学科分类号：

0817 [化学工程与技术];

摘要：

Adsorption of silver from synthetic photographic and spent fix solutions on granulated activated carbon in a batch process has been investigated. The synthetic solutions prepared had similar properties to medical X-ray and photographic process effluents. Sodium and ammonium thiosulfates are the major lixiviants used in the dissolution of silver halides present in photographic and medical X-ray films. The resultant solutions contain substantial amounts of recoverable silver complexes in the form of thiosulfates. The as received carbons were alkaline in nature when contacted with deionised water. These carbons showed very low silver recoveries. However, when these carbons were pre-treated with 0.5 mol/dm(3) sulphuric and nitric acids at 25 degrees C, it had resulted in significant silver recoveries of 98.5% and 95% from sodium and ammonium thiosulfate solutions, respectively. These results were achieved in a narrow range of pH between 3 and 4. Batch atmospheric stripping of adsorbed silver by 2.0 mol/dm(3) HNO3 at 85 degrees C was also investigated. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1269 / 1276

页数：8

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