Separation and selective recovery of platinum and palladium by s

Details Separation and selective recovery of platinum and palladium by s Separation and selective recovery of platinum and palladium by s

1975-12-18

1977-08-09

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Platinum group metal

75101BE, 4236585, 423DIG14, C01G 5500

Patent

active

040411265

ABSTRACT:
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 concentrating solutions of platinum or palladium.

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Dalgikh et al., "Chemical Absts.," vol. 65, 1966, No. 11423(e).
Neikova et al., "Chemical Absts.," vol. 80, 1974, No. 11087e.
Shulman et al., "Chemical Absts.," vol. 77, 1972, No. 80034s.

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