Carbothermic production of aluminium

Details Carbothermic production of aluminium Carbothermic production of aluminium

1980-04-08

1981-04-14

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10R, 75 25, C22B 2102

Patent

active

042617367

ABSTRACT:
In a process for the treatment of fume-laden carbon monoxide evolved in carbothermic reduction of alumina the fume-laden gas is contacted with particulate carbon in a fluidized bed maintained at a temperature, preferably in the range 2010.degree.-2050.degree. C. and above that at which sticky aluminium oxycarbide forms. The temperature of the bed is most conveniently controlled by the rate at which fresh carbon feed material is added to the bed. The hot gas emerging from the bed is rapidly chilled to a temperature below the solidification point of aluminium oxycarbide. This is most conveniently achieved by contact with a large excess of cool alumina/carbon mix in a stream which is continuously circulated through a heat exchange stage.

REFERENCES:
patent: 4099959 (1978-07-01), Dewing et al.
patent: 4177060 (1979-12-01), Tylko

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