Electrolytic process for obtaining high purity platinum from con

Details Electrolytic process for obtaining high purity platinum from con Electrolytic process for obtaining high purity platinum from con

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

053933893

ABSTRACT:
The electrolytic process for obtaining platinum of high purity from a concentrated hydrochloric acid solution of contaminated platinum containing base and noble metal impurities includes electrolyzing the hydrochloric acid solution containing the contaminated platinum in an electrolysis cell subdivided by a cation exchanger membrane under potentiostatic or voltage-controlled conditions with a voltage of 2.5 V to 8 V applied across the anode and cathode under a current density of 0.3 to 12.5 A/dm.sup.2 so as to form a refined platinum-containing solution and a platinum alloy metal deposit. The concentrated hydrochloric acid solutions used in the process can have a contaminated platinum content of 50 to 700 g/l and total metal impurities of .ltoreq.5000 ppm. In contrast to the known prior art processes, the process according to the invention operates with minimal requirements in terms of safety technology and equipment, causes a minimal environmental burden and is far less time-consuming and more economical.

REFERENCES:
patent: 3891741 (1975-06-01), Carlin et al.
patent: 4382845 (1983-05-01), Hubred
patent: 4775452 (1988-10-01), Kuninaga
Gmelin Au, Syst. No. 62, 1949, pp. 338-341.

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