Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag
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United States of America Patent
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Aug 27, 2002
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N/A
app pub date -
Nov 21, 2000
filing date -
Nov 21, 2000
priority date (Note) -
Expired
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Abstract
A method of recovering precious metals from metal alloys produced aluminothermically from base metal smelter slag, includes treating the metal alloy with aqueous sulphuric acid solution having a pH of not greater than about 2 to cause dissolution of nickel and/or cobalt and iron and to cause formation of hydrogen sulfide which reacts with copper in the metal alloy to form a copper sulfide precipitate containing at least one precious metal, and separating the copper sulphide precipitate containing at least one precious metal from the remaining solution containing cobalt sulphate and/or nickel sulphate and ferrous sulphate.
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