Process for obtaining an aluminum sulfate hydrate from an impure

Details Process for obtaining an aluminum sulfate hydrate from an impure Process for obtaining an aluminum sulfate hydrate from an impure

1978-12-28

1979-10-16

Carter, Herbert T.

Chemistry: physical processes

Physical processes

Crystallization

23301, 23305A, 423128, 423556, B01D 902

Patent

active

041712056

ABSTRACT:
Process for recovering aluminum in the form of a specific acid sulfate from an initial solution containing aluminum in the form of dissolved aluminum sulfate hydrate in which the specific acid sulfate is of the formula Al.sub.2 (SO.sub.4).sub.3.0.5H.sub.2 SO.sub.4.11 to 12 H.sub.2 O and in which the initial solution is sequentially treated in a series of crystallizers, wherein successive crystallizers are maintained at a predetermined decreased generally fixed temperature such that in each crystallizer a state of supersaturation of aluminum acid sulfate exists and the parameters attendant operation of each crystallizer insure that a state of static equilibrium of precipitation of product is generally reached before the process solution/slurry is passed to a successive crystallizer, or filtered for recovery of product.

REFERENCES:
patent: 2476979 (1949-07-01), Hoeman
patent: 3141743 (1964-07-01), Marsh
patent: 3143392 (1964-08-01), Seaman
patent: 3193345 (1965-07-01), Marsh
patent: 3330622 (1967-07-01), Seaman
patent: 3397951 (1968-08-01), Jamey et al.
patent: 3484196 (1969-12-01), Cohen et al.
patent: 4039615 (1977-08-01), Mikami et al.
Hemy et al., "Journal of American Chem. Soc.", vol. 72, 1950, pp. 1282-1286.

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