Separation and selective recovery of metal ions

Details Separation and selective recovery of metal ions Separation and selective recovery of metal ions

C - Chemistry, Metallurgy

22

B

53/168

C22B 11/04 (1980.01)

Patent

CA 1109273

Abstract of the Disclosure A process for the separation and selective recovery of platinum and palladium values from an acidic aqueous medium which comprises contacting the medium with a mixed organic extraction reagent comprising a water immiscible organic solvent having dissolved therein an organically substituted secondary amine compound capable of forming complexes of platinum and palladium that are preferentially soluble in the organic solvent and whereby the contacting results in creation of an organic extract phase and an aqueous raffinate phase. After phase separation, palladium is selectively recovered-by contacting the organic phase with an aqueous solution of an acidified reducing agent. Platinum is separately recovered by contacting the organic phase with an aqueous alkaline solution. The process may be employed as a method for concen- trating solutions of platinum or palladium.

280005

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