Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-11-29
1993-09-21
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204252, 204263, 204290F, 204DIG13, 204296, C25B 900, C25B 1308, C25C 700
Patent
active
052465594
ABSTRACT:
A method, and apparatus therefor, for the electrolytic treatment of an acidic solution which comprises: (a) providing an electrolytic cell, the cell comprising: (i) an anode chamber and an anode therein; (ii) a cathode chamber and a cathode therein; (iii) a diaphragm of a non-isotropic fibrous mat comprising 5-70 weight percent organic halocarbon polymer fiber in adherent combination with about 30-95 weight percent of finely divided inorganic particulate impacted into said fiber during fiber formation, the diaphragm having a weight per unit of surface area of about 3-12 kilograms per square meter; (b) introducing the acidic solution into the cell; (c) applying a DC voltage between the anode and the cathode causing the migration of ions through the diaphragm; and (d) recovering a product of the electrolytic treatment from the anode chamber, or the cathode chamber, or from both chambers. The method, and apparatus therefor, are particularly applicable to the recovery of hexavalent chromium from a dilute chromium electroplating rinse solution.
REFERENCES:
patent: 3928146 (1975-12-01), Russell
patent: 4302304 (1981-11-01), Ueda et al.
patent: 4853101 (1989-08-01), Hruska et al.
patent: 5006216 (1991-04-01), Dietrich et al.
patent: 5092977 (1992-03-01), Bachot et al.
Bishara Jeries I.
Brannan James R.
Eltech Systems Corporation
Freer John J.
Valentine Donald R.
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