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US 12,553,106 B2Granted
Sulphide oxidation in leaching of minerals
AssigneeGlencore Technology Pty Limited
InventorPaul Voigt
Life of this patent
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Abstract
A process for treating minerals containing metal sulphide and a precious metal, the process comprising fine grinding the minerals and subjecting the minerals to a first leaching step conducted under oxidising conditions at a pH of from 5 to 7, and subjecting a pulp or suspension or solid residue from the first leaching step to a second leaching step conducted under oxidising conditions at a pH of at least 9.0.
Claims16
A process for treating minerals containing metal sulphide and a precious metal, the process comprising:
- fine grinding the minerals such that they have a P80 of 25 μm or less and subjecting the minerals to a first leaching step conducted under oxidising conditions at a pH of from 5 to 7;
- subjecting a pulp or suspension or solid residue from the first leaching step to a second leaching step conducted under oxidising conditions at a pH of at least 9.0 to provide an oxidised residue;
- and
- leaching the oxidised residue with cyanide or thiosulphate to recover the precious metal.
1 more element
Dependencies are inferred from the claim text.