Electrolytic process for extracting platinum of high purity...

Details Electrolytic process for extracting platinum of high purity... Electrolytic process for extracting platinum of high purity...

C - Chemistry, Metallurgy

25

C

C25C 1/20 (2006.01)

Patent

CA 2111792

Disclosed is electrolytic process for obtaining platinum of a high purity from concentrated hydrochloric acid solutions containing a platinum alloy, the process comprising the steps of a) providing an electrolysis cell having an anode and a cathode and a cation exchanger membrane subdividing the electrolysis cell, b) placing in the electrolysis cell a concentrated hydrochloric acid solution containing metal impurities and a platinum alloy selected from the group consisting of Platinum-Rhodium alloys, Platinum-Iridium alloys and Platinum-Palladium alloys, c) applying a potential across the anode and the cathode of 8 V to 16 V to perform an electrolysis under voltage-controlled conditions at a current density of 12.5 to 37.5 A/dm2 so as to form a purified platinum-containing solution and at least one platinum alloy metal deposit, d) recovering the at least one platinum alloy metal deposit, and e) obtaining the platinum of high purity from the purified platinum- containing solution.

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