Patent ID: 8882881

Claim:
A method of concentrating and recovering precious metals from waste mobile phone PCBs (Printed Circuit Boards) and spent automotive catalysts using waste nonferrous slag, the method comprising the steps of: (a) crushing waste nonferrous slag; (b) crushing spent automotive catalysts; (c) uniformly mixing caustic lime (CaO), which is a flux for controlling slag composition, with the waste nonferrous slag resulting from step (a) thereby forming a mixture, wherein the caustic lime is present in an amount of 5 to 40 parts by weight based on 100 parts by weight of the waste nonferrous slag, the mixture being charged into an electric furnace, followed by melting at a temperature of from 1300 to 1450° C. for 10 to 20 minutes; (d) introducing waste mobile phone PCBs and the spent automotive catalysts of step (b) into the melt of step (c), followed by melting; and (e) maintaining the melt of step (d) for a predetermined time to separate the melt into an alloy phase containing precious metals and a slag phase containing no precious metal.