Patent ID: 6455018
Filing Date: 2002-09-24
Classification: B01J,C22B,Y02P

Abstract:
A process for the recovery of precious metal values and, optionally, other elements, from a waste or spent vehicular postcombustion catalyst, comprising (i) optionally comminuting said catalyst into a finely divided state, (ii) intimately admixing said catalyst with sulfuric acid to form an admixture, (iii) calcining said admixture at a temperature ranging from 150Â° C. to 450Â° C. to form a calcined admixture, and (iv) leaching the calcined admixture in an aqueous leach medium with H+ ions and chloride ions, and obtaining (1) a solid residue substantially depleted of said precious metal values and, optionally, of said other elements, and (2) at least one liquid solution comprising said precious metal values and, optionally, said other elements.