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US 4,540,435 AGranted
Solvent extraction of gold and silver anions under alkaline conditions
AssigneeUniversity of Utah
InventorsJan D. Miller, Michael B. Mooiman
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Abstract
A technique for extracting gold values from an aqueous system containing gold cyanide anions by contact with a strong solvating extractant under basic conditions is disclosed. Useful extractants include organic phosphorus oxides and sulfur oxides.
Claims9
A method for extracting gold or silver values from an aqueous system containing gold or silver cyanide anions comprising contacting said system with a strong solvating extractant having minimal water solubility at pH ranges of above about 7, wherein said extractant is an alkyl phosphorus oxide or an organic sulfur oxide.
Dependencies are inferred from the claim text.