Abstract
A laboratory study was carried out on the treatment of silver bearing materials in a sulphuric acid system to recover the silver as a high purity product. The study resulted in the development of a hydrometallurgical process comprising the following steps: (1) dissolution of silver in concentrated sulphuric acid, (2) precipitation of silver sulphate salt by dilution with water, (3) dissolution of silver sulphate and (4) reduction of silver by hydrogen. Impurities present in the feed materials were effectively rejected during the proposed processing steps, so that the silver product was free of contaminants. Application of this hydrometallurgical process to the treatment of coinage webbing, jewelry scrap and silver metal containing most common impurities, resulted in 99% recovery of 99.9 grade silver as a fine powder.
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