Method for concentration of gold in copper sulfide minerals

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

Reexamination Certificate

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C075S423000, C075S744000, C423S034000, C423S036000, C210S162000, C210S175000, C210S176000, C205S568000, C205S571000

Reexamination Certificate

active

08052774

ABSTRACT:
Disclosed herein is a method for concentrating gold contained in a leach residue obtained in a copper hydrometallurgical process for recovering copper from a copper sulfide mineral to efficiently separate and recover gold from the leach residue: a gold-bearing copper sulfide mineral is subjected to pressure leaching with sulfuric acid at a temperature higher than 102° C. and 112° C. or lower to obtain a leach residue, and the leach residue is subjected to flotation to separate it into a float fraction and a sink fraction; the float fraction obtained by flotation is desulfurized to obtain a desulfurized product; the desulfurized product is subjected to oxidative roasting to obtain an oxidatively-roasted product; the oxidatively-roasted product is dissolved in a sulfuric acid solution to obtain a copper solution, and a gold-bearing residue is separated and recovered from the copper solution.

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