Electrolytic process for extracting high purity platinum from pl

Details Electrolytic process for extracting high purity platinum from pl Electrolytic process for extracting high purity platinum from pl

1993-12-20

1995-02-28

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204111, 204126, 204140, C25C 120

Patent

active

053933885

ABSTRACT:
The electrolytic process for obtaining platinum of high purity from concentrated hydrochloric acid solutions of a platinum alloy containing Rh, Ir and/or Pd proceeds with simultaneous depletion of noble and base metal impurities from the solution. This electrolysis process takes place in an electrolysis cell having an anode and cathode and subdivided by a teflon cation exchanger membrane under potentiostatic or, voltage-controlled conditions with a potential applied across the anode and cathode of 8 V to 16 V, preferably 11.5 to 12 V, at a current density of 12.5 to 37.5 A/dm.sup.2, preferably 22.5 to 35 A/dm.sup.2, to form a purified platinum-containing solution from which the high purity platinum can be obtained and also platinum alloy metal component deposits on the anode and cathode. The concentrated hydrochloric acid solution of the platinum alloy can have a platinum alloy content of 50 to 700 g/l and total metal impurities of not greater than 5000 ppm.

REFERENCES:
patent: 4775452 (1988-10-01), Kuninaga et al.

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