REACTIVE RESINS USEFUL FOR PRECIOUS METAL RECOVERY

摘要

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.