Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1974-01-29
1976-04-06
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204 89, 204 96, 204112, 204130, 204180P, C25B 100, C25C 106
Patent
active
039487385
ABSTRACT:
Regeneration of an exhausted chromium-plating solution can be effectively effected by two-stage diaphragm electrolysis. For the first electrolysis, the anode compartment is charged with a diluted aqueous chromic acid solution and the cathode compartment is charged with an exhausted chromium-plating solution. After the first electrolysis, the solution obtained in the cathode compartment is transferred into the anode compartment which has been emptied by withdrawing the electrolytic solution obtained by the first electrolysis, and the cathode compartment is charged with an exhausted chromium-plating solution. Then, the second electrolysis is conducted. When each electrolysis is finished, regenerated solution useful as a chromium-plating solution is obtained. Some modifications are effective not only for regeneration of an exhausted chromium-plating solution but also for prevention of environmental pollution.
REFERENCES:
patent: 3595765 (1971-07-01), Joo
patent: 3761369 (1973-09-01), Tirrell
Kabushiki Kaisha Fuji Kuromu Sha
Prescott A. C.
Williams Howard S.
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