METHOD OF RECOVERING PRECIOUS METAL FROM AQUEOUS ALKALI CYANIDE SOLUTIONS Russian patent published in 1998 - IPC

FIELD: nonferrous metallurgy. SUBSTANCE: method can be applied to recover such precious metals as gold and silver using new ion-exchange resins containing arylguanidyl group of those arylguanidine compounds having pKa (25 C) below 13 (preferably below 12). Because of using alkali eluent solutions such as those containing sodium hydroxide or sodium benzoate, resins are prepared with improved eluent capability as compared to guanidine reagents. Before conducting elution of precious metals from resins containing guanidyl function, selective elution of basic metals may be performed. EFFECT: facilitated elution of precious metal out of sorbent resin. 50 cl, 6 tbl