Separation and/or purification of precious metals

Details Separation and/or purification of precious metals Separation and/or purification of precious metals

C - Chemistry, Metallurgy

22

B

53/168

C22B 11/00 (2006.01) C01G 5/00 (2006.01) C22B 3/26 (2006.01)

Patent

CA 1049794

A B S T R A C T A process for the treatment of a concentrate of by-metals comprises heating the concentrate at between 1000°C and 1500°C, preferably at about 1300°C, in a gaseous stream which comprises oxygen. The heating step is effected for a period of time sufficient to ensure quantitative removal of one or more of lead, arsenic, silver, bismuth and/or tellurium and the oxidation of ruthenium, rhodium and iridium to their oxides.

235551

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