Electrolytic process for dissolving platinum, platinum metal imp

Details Electrolytic process for dissolving platinum, platinum metal imp Electrolytic process for dissolving platinum, platinum metal imp

1993-12-20

1995-06-13

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204109, C25C 120

Patent

active

054239575

ABSTRACT:
The electrolytic process for dissolving platinum, platinum metal impurities and/or platinum metal alloys, in particular with contents of Rh, Pd, Ir, Au and Ag, in 6 to 8N aqueous hydrochloric acid is characterized by a dissolution process that takes place in an electrolysis cell subdivided by a cation exchanger membrane into an anode and cathode compartment containing anode and cathode respectively, and, if appropriate, in the presence of platinum metal salts or platinum metal acids, at temperatures between 50.degree. and 110.degree. C., under potentiostatic or voltage-controlled conditions in the range of 2.5 V to 8 V and under a current density of 0.3 to 7.0 A/dm.sup.2. The potential across the anode and the cathode is controlled so that chlorine gas is generated and the anode is contacted with the aqueous hydrochloric acid solution and the chlorine gas in impulse-form.

REFERENCES:
patent: 1467202 (1923-09-01), Slatineau
patent: 4382845 (1983-05-01), Hubred
patent: 4775452 (1988-10-01), Kuninaga
Derwent Abstract of SU-496239 as Belo Phys Org. Ch, Mar. 4, 1976.
Ullmann Chemical Encyclopedia, 1992, Month not Available pp. 91 & 92 (corres. to vol. 18, 1979, p. 708).
DATABASE WPI, Section Ch, Week 7709, Derwent Publications Ltd., & SU-A-496239, Mar. 5, 1976.

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