Patent ID: 8052774
Filing Date: 2011-11-08
Classification: C22B,Y02P

Abstract:
1. A method for concentrating gold contained in a copper sulfide mineral, comprising: a leaching step of subjecting a gold-bearing copper sulfide mineral to pressure leaching with sulfuric acid at a temperature higher than 102° C. and 112° C. or lower to obtain a leach residue; a flotation step of subjecting the leach residue to flotation to separate it into a float fraction and a sink fraction; a desulfurization step of subjecting the float fraction to desulfurization to obtain a desulfurized product; an oxidative roasting step of subjecting the desulfurized product to oxidative roasting to obtain an oxidatively-roasted product; and a separation step of dissolving the oxidatively-roasted product in a sulfuric acid solution to obtain a copper solution and a gold-bearing residue and separating the gold-bearing residue from the copper solution.