TREATMENT METHOD OF SULPHIDE CONCENTRATES CONTAINING PRECIOUS METALS Russian patent published in 2012 - IPC C22B11/00 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: method involves leaching with further separation of non-soluble residue from the solution, its drying and further melting when it is mixed with sodium carbonate, silicon-containing flux, borax so that alloy of precious metals and slag is obtained. At that, original concentrate is subject to leaching by means of nitric acid solution. Melting is performed using the addition of sodium chloride to mixture. Concentrate is leached using nitric acid solution with mass concentration of 350-550 g/l. Sodium chloride is added to mixture for melting purpose in quantity which is more by 10-20% than stoichiometric quantity as per lead chloride obtaining reaction.

EFFECT: improving the extraction of precious metals; obtaining purer alloy and reducing the sulphide concentrate treatment costs.

3 cl, 4 tbl, 1 ex