Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2010-03-23
2011-11-08
Wyszomierski, George (Department: 1733)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
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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Asano Satoshi
Heguri Shinichi
Idegami Atsushi
Nagase Noriyuki
Takano Masatoshi
Armstrong, IV James E.
Edwards Angell Palmer & & Dodge LLP
Harada Junko
McGurthry Banks Tima M
Sumitomo Metal & Mining Co., Ltd.
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