Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-11-27
1997-03-11
Gorgos, Kathryn
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204270, 204289, C25D 702
Patent
active
056097387
ABSTRACT:
In a tank confined electrolysis process, such as electrowinning or electrorefining, having circulated electroplating solution containing sulfuric acid, a multi-element cover system is applied below the electrode conductor connections and above the surface of the electrolyte bath. This cover is evacuated in the interstices below the cover and above the bath at a rate exceeding the stoichiometric ratio causing any leakage to occur into the volume overlying the bath thereby preventing acid aerosol from escape. The rate of evacuation is restricted so that humidity is maintain under the cover and over the surface of the bath to prevent the formation of crystals formed from aerosol droplets which become supersaturated. In a preferred embodiment, a circular weir in combination with gas discharge over the weir to a downcomer is disclosed. Entrainment of air over the weir and into the downcomer is disclosed to provide sufficient pumping for evacuation.
REFERENCES:
patent: 4668353 (1987-03-01), Smith
patent: 5149411 (1992-09-01), Castle
Invention Disclosure, "Oxide Tankhouse Anodes", Magma Copper Company, Apr. 26, 1985.
Magma Copper Company Interoffice Correspondence, "Oxide Tankhouse Anodes", M. F. Vancas, Apr. 26, 1985 (unpublished).
Bates Robert K.
Cox Terrance J.
Imrie William P.
Murray James A.
Nees Michael R.
Bechtel Group Inc.
Gorgos Kathryn
Mee Brendan
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