Utilization of partially calcined alumina as precipitation aid i

Details Utilization of partially calcined alumina as precipitation aid i Utilization of partially calcined alumina as precipitation aid i

1984-11-06

1986-02-04

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423629, 23301, 23305A, C01F 714

Patent

active

045685274

ABSTRACT:
Finely divided alumina, recovered from the dust recovery systems of alumina hydrate calcination facilities, is employed as seed for the precipitation of alumina hydrate from pregnant Bayer process liquors. The finely divided alumina dust can either be used as seed in as-is condition, or, if desired, agglomerated to coarse and strong particles prior to use as seed. Agglomeration is accomplished by combining the dust in a predetermined weight ratio with alumina trihydrate seed under controlled conditions. The process allows the utilization of an otherwise undesirable and unacceptable by-product of alumina hydrate calcination.

REFERENCES:
patent: 3486850 (1969-12-01), Day
patent: 4051222 (1977-09-01), Gnyra
patent: 4234559 (1980-11-01), Tschamper
patent: 4311486 (1982-01-01), Yamarla et al.
patent: 4364419 (1982-12-01), Yamada et al.
patent: 4511542 (1985-04-01), Anjier et al.
patent: 4512959 (1985-04-01), Pohland et al.

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