Method of producing pure alumina from alunite

Details Method of producing pure alumina from alunite Method of producing pure alumina from alunite

1979-10-24

1982-05-25

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423132, 423111, 423 82, 423 84, C01F 722

Patent

active

043316360

ABSTRACT:
Pure alumina (Al.sub.2 O.sub.3) is recovered from alunite (Al.sub.2 (SO.sub.4).sub.3.K.sub.2 SO.sub.4.4 Al (OH).sub.3) which is found mixed with various impurities by first calcinating the alunite in the presence of a chloride to produce impure Al.sub.2 O.sub.3 and other biproducts, and the impure Al.sub.2 O.sub.3 is then contacted with concentrated HCl to produce, after concentration and crystallization, crystals of AlCl.sub.3.6H.sub.2 O. These crystals are then calcinated to yield highly concentrated HCl and pure alumina.

REFERENCES:
patent: 1214991 (1917-02-01), Blough et al.
patent: 1301394 (1919-04-01), Cross
patent: 1701510 (1929-02-01), Sisurin
patent: 2413709 (1947-01-01), Hoffman
patent: 3959438 (1976-05-01), Messner

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