Electrolytic reduction of alumina

Details Electrolytic reduction of alumina Electrolytic reduction of alumina

1990-02-13

1991-04-09

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204243R, 204279, 204291, C25C 306, C25C 318, C25C 308

Patent

active

050062093

ABSTRACT:
Finely divided particles of alumina are electrolytically reduced to aluminum in an electrolytic reduction vessel having a plurality of vertically disposed, non-consumable anodes and a plurality of vertically disposed, dimensionally stable cathodes in closely spaced, alternating arrangement with the anodes. A horizontally disposed, gas bubble generator is located at the vessel bottom, underlying the cathodes and the spaces between each pair of adjacent electrodes. The vessel contains a molten electrolyte bath composed of (1) NaF+Alf.sub.3 eutectic, (2) KF+AlF.sub.3 eutectic and (3) LiF. The alumina particles are maintained in suspension in the molten electrolyte bath by rising gas bubbles generated at the anodes and at the gas bubble generator during the reduction process.

REFERENCES:
patent: 4592812 (1986-06-01), Beck et al.
patent: 4865701 (1989-09-01), Beck et al.
Wilkening et al., "Material problems in electrowinning of aluminum by the Hall-Heroult process", Journal of Applied Electrochemistry 19 (1989), pp. 596-604.
Grjotheim et al., Aluminum Electrolysis Fundamentals of the Hall-Heroult Process, Aluminum-Verlag, Dusseldorf, 1982 pp. 405-411.

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