Carbothermic production of aluminium

Details Carbothermic production of aluminium Carbothermic production of aluminium

C - Chemistry, Metallurgy

22

B

53/243

C22B 21/02 (2006.01) C22B 5/06 (2006.01) C22B 5/14 (2006.01)

Patent

CA 1148363

A B S T R A C T 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 fluidised bed maintained at a temperature, preferably in the range 2010 - 2050°C and above that at which sticky aluminum 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 aluminum 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 state.

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