C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/229
C22B 3/00 (2006.01) C22B 11/00 (2006.01) C22B 11/08 (2006.01) C22C 11/08 (2006.01)
Patent
CA 2032357
PRESSURE OXIDATION METHODS FOR GOLD EXTRACTION AND TOXIC WASTE TREATMENT Abstract of the Disclosure The present invention provides methods for extracting gold from refractory auriferous material, such as a gold-containing ore, a concentrate thereof, a reclaimed sulphide concentrate or some combination thereof, including the steps of mixing the refractory auriferous material with at least one toxic residue exhibiting a low sulphur content to form a low sulphur content mixture; pressure oxidizing the mixture; and cyaniding the oxidized mixture. Methods for extracting gold while simultaneously decreasing the toxicity of previously generated toxic wastes are also discussed. The gold extraction/toxic waste treatment methods preferably involve mixing refractory auriferous material with first and second toxic residues of low sulphur content; pressure oxidizing the mixture; and cyaniding the oxidized mixture. In these methods, contaminants in the toxic residues (e.g., iron and arsenic) combine with each other or with other feed components to form inert molecules having a decreased environmental impact.
Miramar Con Mine Ltd.
Nerco Minerals Company
Smart & Biggar
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