Patent ID: 7544231

Claim:
A process of recovering platinum group metals (PGMs) from a pregnant solution or leachate containing PGM values and base metals, the process including the steps of: a) non-selective precipitation of the PGM values and base metals to form an insoluble precipitate comprising the PGM values and base metals; b) selective leaching of the precipitate to form (i) a leach solution containing the base metals and a residue containing the PGM values, or (ii) a leach solution containing the base metals and PGM values and a depleted residue; and c) recovery of the base metals from the leach solution of b)(i) or b)(ii) and recovery of the PGM values from the residue of b)(i) or the leach solution of b)(ii), depending on the selective leaching in step b), wherein the pregnant solution or leachate containin the PGM values and base metals is a cyanide solution or leachate.