High temperature pressure oxidation of ores and ore concentrates containing silver using controlled precipitation of sulfate species
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United States of America Patent
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Nov 4, 2003
Grant Date -
Jul 24, 2003
app pub date -
Dec 21, 2001
filing date -
Dec 21, 2001
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Abstract
A method for the treatment of sulfide ores containing silver by pressure oxidation. The method includes the addition of a sulfate-binding material to reduce the formation of jarosite species during pressure oxidation. Silver can then be recovered from the solids portion of the discharge slurry. A jarosite reduction step, such as by a lime boil, that is typically required to recover silver after pressure oxidation can advantageously be eliminated.
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