C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168
C22B 3/32 (2006.01) C01G 55/00 (2006.01) C22B 3/26 (2006.01) C22B 3/28 (2006.01)
Patent
CA 1036362
ABSTRACT OF THE DISCLOSURE This invention relates to the separation and purification of platinum group metals and, in particular to the separation of mixtures of rhodium, platinum and iridium. According to one specific form of the invention, the platinum, rhodium and iridium are present as salts in aqueous solution and the separation and purification is accomplished by (a) adjusting the pH, as necessary, to provide an acidic solution; (b) contacting the acidic solution with an oxidising agent sufficient to effect the oxidation of all iridium to Ir(IV); (c) contacting the oxidised solution with a nitrogen-containing organic compound selected from the group consisting of secondary amines, tertiary amines and quaternary ammonium compounds; and (d) removing from contact with the oxidised solution an organic phase containing sub- statially all of the platinum and iridium present in association with the nitrogen- containing organic compound used in step (c). - 1 -
215705
Matthey Rustenburg Refiners (proprietary) Limited
Na
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