Anode film formation and control

Details Anode film formation and control Anode film formation and control

1987-11-03

1990-05-01

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

C25C 306

Patent

active

049215841

ABSTRACT:
A protective film is created about the anode within a cryolite-based electrolyte during electrolytic production of aluminum from alumina. The film function to minimize corrosion of the anode by the cryolitic electrolyte and thereby extend the life of the anode. Various operating parameters of the electrolytic process are controlled to maintain the protective film about the anode in a protective state throughout the electrolytic reduction of alumina. Such parameters include electrolyte temperature, electrolyte ratio, current density, and Al.sub.2 O.sub.3 concentration. An apparatus is also disclosed to enable identification of the onset of anode corrosion due to disruption of the film to provide real time information regarding the state of the film.

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