Production of aluminium

Details Production of aluminium Production of aluminium

C - Chemistry, Metallurgy

25

C

204/49

C25C 3/06 (2006.01) B01J 2/22 (2006.01) C22B 1/24 (2006.01) C22B 7/02 (2006.01)

Patent

CA 1082125

ABSTRACT In the production of alumina for supply to electrolytic reduction cells in the production of aluminium metal, alumina trihydrate is calcined in a calcination furnace to convert it to alumina, typically having a water content of less than 2%. In the course of this operation fine particles in a size range below 44 microns are separated from the exhaust gases from the calciner. In conventional procedures these particles which are only partially dehydrated, are either recycled to the calciner. or directly added to the calciner product alumina. With the dual objective of reducing environ- mental pollution and saving valuable alumina the present invention converts these collected fines into compacted granules in a size range of 150-5000 microns for supply to an electrolytic reduction cell either directly or after readmixture with the calciner product alumina. -1-

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