METHOD OF EXTRACTION OF NOBLE METALS FROM SULFIDE MATERIALS Russian patent published in 2003 - IPC

FIELD: metallurgy of noble metals; gold extracting plants reworking sulfide raw materials. SUBSTANCE: proposed method includes grinding of materials, preparation of aqueous pulp, bubbling air through pulp in presence of Tiobacillus Ferroosidance microorganisms, use of waste aqueous phase in circulation, sorption cyanide leaching of gold and silver from solid phase followed by separation of ion-exchange resin containing noble metals, desorption of noble metals and electrolytic production of gold and silver. Prior to sorption cyanide leaching, enriched concentrate of noble metals is separated from solid phase by gravitational concentration; tailings of gravitational concentration are subjected to sorption cyanide leaching. EFFECT: enhanced efficiency.