Process for obtaining pure alumina by the hydrochloric attack of

Details Process for obtaining pure alumina by the hydrochloric attack of Process for obtaining pure alumina by the hydrochloric attack of

1979-05-08

1980-12-02

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423128, 423132, C01F 722, C01F 726

Patent

active

042371023

ABSTRACT:
A cyclic process for obtaining very pure alumina by the hydrochloric acid attack of a silico-aluminous material, the said process comprising, in a first stage, the precipitation of at most 75% of the alumina present in the liquor originating from the attack in the form of hexahydrated aluminum chloride which is subsequently decomposed by heating, then, in a second stage, the treatment of the liquor leaving the first stage with HCl gas in order to precipitate dissolved Al.sub.2 O.sub.3 in the form of hexahydrated aluminum chloride which is recycled into the liquor leaving the attack, while the hydrochloric liquor leaving the second stage and impoverished in Al.sub.2 O.sub.3 but rich in impurities, is treated with a recycled sulphuric liquor in order to precipitate impurities as their corresponding sulphates.

REFERENCES:
patent: 3484196 (1969-12-01), Cohen et al.
patent: 3620671 (1971-11-01), Maurel et al.
patent: 3862293 (1975-01-01), Maurel et al.
patent: 4124680 (1978-11-01), Cohen et al.

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