METHOD OF SEPARATION OF METALS AT PROCESSING HYDROCHLORIC SOLUTIONS CONTAINING NOBLE METALS, ANTIMONY AND OTHER BASE METALS Russian patent published in 2009 - IPC C22B11/00 C22B30/02 C22B3/44 

FIELD: metallurgy.

SUBSTANCE: method consists in processing solution with sodium nitrite at heating, in pulp cooling and in separating sediment of base metals. Before sodium nitrite treatment solution is neutralised with alkali to contents of HCI 50-70 g/l; produced sediment containing antimony is filtered. Further redox potential of solution is reduced with iron powder to 500-550 mV for extracting gold into cementite. Sediment containing antimony is dissolved in hydrochloric acid. Produced solution is filtered and treated with oxidiser to redox potential 800-1000 mV for purification from suspension. Further solution is diluted with water to contents of HCI 80-100 g/l, and produced antimony sediment is separated and washed with water.

EFFECT: antimony and gold are extracted into separate products with low contents of platinum metals in main part of processing hydrochloric acid solutions containing noble and non-ferrous metals; consumption of sodium nitrite is reduced at solution nitration.

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