Reactive resins useful for precious metal recovery

Details Reactive resins useful for precious metal recovery Reactive resins useful for precious metal recovery

C - Chemistry, Metallurgy

22

B

53/233, 53/376

C22B 3/42 (2006.01) B01J 41/04 (2006.01) C01G 7/00 (2006.01)

Patent

CA 1336748

An improved method for the recovery of precious metals is disclosed. By this process precious metals in the form of anionic complexes are contacted with a weak-base anion exchange resin, capable of complexing with the anionic complex, containing weak-base functionalities derived from linear or cyclic polyaminoalkylene amines which have more than 1 amine moiety and at least 3 carbon atoms in a 1,X-alkylene moiety or moieties separating at least 1 amine moiety from a second amine moiety (i.e., X is an integer greater than 2). The method of the invention allows treating precious metal-containing materials at a higher pH and with improved selectivity than conventional weak-base ion exchange resins. Additionally, the method provides resins that may be regenerated by elution with caustic, for example.

551906

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