METHOD OF PROCESSING SILVER-CONTAINING CONCENTRATES Russian patent published in 2014 - IPC C22B11/06 C22B3/04 C22B3/44 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of processing silver-containing concentrates. Oxidation-chlorination roasting is carried out with the application of chlorides of alkali metals with obtaining a chloride cinder, further leaching of the chloride cinder and separation of a cake from the solution. The cake of autoclave leaching of silver-containing concentrates, with the application as such of copper sulphide silver-containing concentrates, is subjected to oxidation-chlorination roasting. Leaching of the chloride cinder is performed in water with obtaining a chloride solution and a cake of water leaching. The obtained chloride solution is processed with sodium sulphide and calcium chloride with the separation of residues of copper sulphide and calcium sulphate dehydrate. A water solution of alkali metal chloride is evaporated to saturation and directed to oxidation-chlorination roasting. The cake of water leaching is leached in a sodium thiosuphfate solution. The obtained productive solution is processed with sodium sulphide, the silver-containing sediment of sulphides is separated from the regenerated sodium thiosulphate solution, and the regenerated solution is directed to a stage of leaching the cake of water leaching, with the sediment of sulphides being processed with obtaining silver.

EFFECT: reduction of expenditures and increase of silver extraction.

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