Apparatus and method for the continuous calcination of aluminum

Details Apparatus and method for the continuous calcination of aluminum Apparatus and method for the continuous calcination of aluminum

1985-02-15

1987-06-09

Andrews, Melvyn J.

Metallurgical apparatus

Means for treating ores or for extracting metals

By means applying heat to work, e.g., furnace

432 58, F27B 1509

Patent

active

046714979

ABSTRACT:
A method and apparatus for calcining an aluminum hydroxide source to an aluminum oxide in which the amount of the .alpha.-modification can be controlled from very low to very high values. In accordance with the present invention, the calcination of the source material takes place in two stages, in the first of which the material is preheated with air and then passed to a fluidized bed calciner after which it is delivered to a holding cyclone. In the second stage, the previously calcined material which may contain up to about 80% of the .alpha.-modification is calcined further in a rotary tubular kiln which is followed downsteam by a cooler.

REFERENCES:
patent: 4203689 (1980-05-01), Kraxner et al.
patent: 4286944 (1981-09-01), Labriot et al.

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