Extraction of metals
OwnerRichard A. Grant, Barry A. Murrerinventors
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Abstract
A solvent extraction process for the separation of one or more precious metal species from other precious metal species and possibly also base metal species contained in an aqueous acidic solution of the type produced during the recovery of precious metals from ore or scrap in which the solvent contains an extractant which is a mono-N-substituted amide. Also a mono-N-substituted amide extractant. The extractant permits better separation factors generally and also enables platinum to be extracted before palladium and permits improved extraction of iridium from rhodium.
Claims9
An organic solvent extraction process for the separation of a precious metal component in an aqueous acidic phase which contains said precious metal component and at least one other metal component selected from precious metal and base metal components, said precious metal component being selected from the group consisting of gold, silver, platinum, ruthenium, rhodium, palladium, osmium and iridium, and said base metal component being selected from the group consisting of iron, copper, nickel, selenium, tellurium and antimony, said process comprising contacting the aqueous acidic phase with an organic solvent phase containing dissolved therein an extractant which is a mono-N-substituted amide.
Dependencies are inferred from the claim text.