Back to results
US 4,902,345 AGranted
Treatment of refractory carbonaceous and sulfidic ores or concentrates for precious metal recovery
AssigneeNewmont Gold Company
InventorsBrian Ball, Rong-Yu Wan
Life of this patent
Estimating the term…
Abstract
The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation leaching.
Claims11
A method for the recovery of a precious metal from carbonaceous and sulfidic ores or concentrates which comprises:
- (a) forming an aqueous slurry of said ores or concentrates;
- (b) pretreating said aqueous slurry in an autoclave with an oxygen-containing gas;
- (c) leaching said precious metal with thiourea in the presence of added carbon;
- and
- (d) recovering said precious metal.
2 more elements
The method as defined in wherein a reducing agent is added to control the oxidation potential when the precious metal is leached with thiourea in the presence of carbon.
Dependencies are inferred from the claim text.