Alumina production

Details Alumina production Alumina production

C - Chemistry, Metallurgy

01

F

23/247

C01F 7/04 (2006.01) C01F 7/44 (2006.01) F26B 3/084 (2006.01)

Patent

CA 1127375

ABSTRACT OF THE DISCLOSURE In a process for the production of alumina which comprises the steps of digesting bauxite to produce a precipitate of alumina trihydrate containing uncombined moisture, drying the alumina trihydrate to reduce the uncombined moisture content thereof, and feeding the dried alumina trihydrate to a calciner to convert the alumina trihydrate to alumina, improved economy is achieved by drying the alumina trihydrate in a fluidized bed in which the fluidized mass is heated indirectly by means of steam which is available from the digestion and recovery system. Drying of the alumina trihydrate in this manner prior to feeding it to the calciner also reduces the fuel require- ment in the calciner and enables the throughput of the calciner to be increased.

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