SULPHIDE AURIFEROUS FLOTATION CONCENTRATES PROCESSING METHOD Russian patent published in 2012 - IPC C22B11/00 C22B3/18 B01D21/26 

FIELD: metallurgy.

SUBSTANCE: method involves concentrate bio-oxidation with bio-pulp obtaining, its dehydration with cake obtaining and its processing with the extraction of gold. Bio-pulp dehydration is done by two-stage centrifuging. At the first stage 90-95% of bio-pulp is dehydrated with centrate of first stage obtaining that contains solid not more than 10-14 g/l and cake with moisture not less than 40%. Not less than 1 g/m³ of antifoaming agent is added to centrate obtained after first stage, the agent is selected from silicone organic antifoaming agents, for example, Penta® 474, and directed to the second stage of centrifuging at maintaining fluid level height in centrifugal drum not less than 10 mm with obtaining centrate that contains solid not more than 0.8 g/l. The cakes obtained after the first and second stage of centrifuging are combined and directed for further processing of gold extraction.

EFFECT: process intensifying and obtaining of more dry cake with low moisture content.

10 dwg, 2 ex