Low acidity, low solids pressure oxidative leaching of sulphidic feeds

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United States of America Patent

PATENT NO 11118244
APP PUB NO 20180298466A1
SERIAL NO

15951615

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Process for recovering one or both of copper and silver from a sulphidic feed containing iron, arsenic, copper and silver by pressure oxidizing an aqueous feed slurry of the sulphidic feed in a pressure vessel to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. The process includes operating the pressure vessel at a sufficiently low solids content to maintain a free acid level below 30 g/L in the liquid phase, and providing sufficient heat to maintain a temperature in the pressure vessel above 200° C. Copper metal is recovered from the liquid phase and/or silver may be recovered from the solids by cyanide leaching without the need for a jarosite destruction step.

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Patent Owner(s)

Patent OwnerAddress
SHERRITT INTERNATIONAL CORPORATION10101 114 STREET BOX 338 FORT SASKATCHEWAN ALBERTA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Holloway, Preston Carl Edmonton, CA 5 6
Smit, Jan Tjeerd St Albert, CA 6 12

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