Alumina production

Details Alumina production Alumina production

1979-02-06

1980-09-23

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423DIG16, 423625, 423121, 423127, 34 10, C01F 744

Patent

active

042242886

ABSTRACT:
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 requirement in the calciner and enables the throughput of the calciner to be increased.

REFERENCES:
patent: 3227521 (1966-01-01), Carithers et al.
patent: 3265465 (1966-08-01), Turpin
patent: 3336109 (1967-08-01), Du Bellay et al.
patent: 3408159 (1968-10-01), Teichner et al.
patent: 3408745 (1968-11-01), Filippi et al,
patent: 3529356 (1970-09-01), Diettrich
patent: 3565408 (1971-02-01), Reh et al.
patent: 3864461 (1975-02-01), Miller et al.

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