Method for removing impurities from solvent extraction solutions
AssigneeInco Limited
InventorJean-Jacques Robert Perraud
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Abstract
A method for regenerating an amine extractant used for recovery of metals involves contacting a liquid organic phase containing an amine complexed with one or more metals with an aqueous solution substantially free of chloride ions to strip the one or more metals from the organic phase. The stripped organic phase is then contacted with a solution of hydrochloric acid to regenerate the amine extractant which can then be recycled in a production process.
Claims16
A process for regenerating metal loading capacity of an amine comprising:
- providing a liquid organic phase containing an amine complexed with a metal that loads on the amine as a chloride complex, wherein said metal is selected from the group consisting of Zn and Fe;
- contacting said liquid organic phase with an aqueous solution substantially free of chloride ions to strip said metal without formation of a metal precipitate;
- and
- contacting the stripped organic phase with a solution containing chloride ions to hydrochlorinate the amine.
A process for regenerating the metal loading capacity of an amine according to claim 9 wherein the alkanol is isodecanol.
Dependencies are inferred from the claim text.