Electrolytic reduction of alumina

Details Electrolytic reduction of alumina Electrolytic reduction of alumina

C - Chemistry, Metallurgy

25

C

204/147, 204/49

C25C 3/06 (2006.01) C25C 3/08 (2006.01)

Patent

CA 1338052

Alumina is reduced to molten aluminum in an elec- trolytic cell containing a molten electrolyte bath com- posed of halide salts and having a density less than alumina and aluminum and a melting point less than alu- minum. The cell comprises a plurality of vertically disposed, spaced-apart, non-consumable, dimensionally stable anodes and cathodes. Alumina particles are dis- persed in the bath to form a slurry. Current is passed between the electrodes, and oxygen bubbles form at the anodes, and molten aluminum droplets form at the cath- odes. The oxygen bubbles agitate the bath and enhance dissolution of the alumina adjacent the anodes and in- hibit the alumina particles from settling at the bottom of the bath. The molten aluminum droplets flow down- wardly along the cathodes and accumulate at the bottom of the bath.

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