METHOD OF SILVER RECEIVING Russian patent published in 2010 - IPC C22B11/00 C22B7/00 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: method includes its dissolution in nitric acid, preparation from received solution by evaporation of product, containing silver and copper nitrate, its mixing to water solution of ammonia. After blending it is implemented filtering of mixture with receiving of ammonia - nitrate filtrate, settling of silver from ammonia - nitrate filtrate by means of restorative treatment and washing of reduced silver. Additionally mixing to water solution of ammonia is implemented up to achievement of value pH of mixture, equal to 3-6. Before restorative treatment it is finished weight ratio of ammonia and silver in ammonia - nitrate filtrate up to 0.315-0.41. Restorative treatment of ammonia - nitrate filtrate is implemented at heating with usage in the capacity of reducing agents of formic acid and (or) sulphite sodium. Reduced silver is washed by solution of hydrochloric acid.

EFFECT: reduction of receiving cycle duration of silver and cost cutting.

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