Recovery of precious metals
AssigneeOntario Research Foundation
InventorsVaikuntam I. Lakshmanan, Jurgen K. Biskupski
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Abstract
The extent of recovery of precious metals, preferably gold and silver, from precious metal ores, concentrates, tailings and wastes which are also sulphide- and arsenic- and/or antimony-bearing, is enhanced by treatment with Caro's acid (H.sub.2 SO.sub.5).
Claims13
In a method of recovery of a precious metal from a sulphide-containing arsenic- and/or antimony-containing precious metal-containing material, the improvement which comprises treating said material with H.sub.2 SO.sub.5 to oxidize at least part of the arsenic and/or antimony content of the material to a water-soluble form prior to processing to effect said precious metal recovery.
A method of pretreatment of a sulphide-containing arsenic- and/or antimony-containing precious metal ore or concentrate thereof to render the same more susceptible to recovery of said precious metal therefrom, which comprises contacting said ore or concentrate thereof with H.sub.2 SO.sub.5 in an amount at least sufficient to effect at least partial oxidation of said arsenic and/or antimony to a water-soluble form.
Dependencies are inferred from the claim text.