Process for producing coarse grains of aluminum hydroxide

Details Process for producing coarse grains of aluminum hydroxide Process for producing coarse grains of aluminum hydroxide

1980-08-05

1982-01-19

Garris, Bradley

Chemistry: physical processes

Physical processes

Crystallization

23305A, 423121, 423127, 423629, B01D 902

Patent

active

043114865

ABSTRACT:
Coarse grains of aluminum hydroxide are economically produced in a high yield from sodium aluminate solution by dividing supersaturated sodium aluminate solution being prepared by the Bayer process and having a molar ratio of Na.sub.2 O as caustic soda to Al.sub.2 O.sub.3 in solution of less than 1.8 into two streams, adding a portion of recycle seed aluminum hydroxide and fine grains of aluminum hydroxide as seed to one of the streams of sodium aluminate solution, partially decomposing the sodium aluminate solution until the molar ratio of the sodium solution reaches 1.8-2.6, adding to the resulting partially decomposed sodium aluminate slurry the other stream of sodium aluminate solution, which has been cooled to a temperature low enough to lower the temperature of the partially decomposed sodium aluminate slurry by at least 3.degree. C., and the remaining portion of recycle seed aluminum hydroxide, and then further decomposing the cooled and mixed sodium aluminate slurry until the molar ratio of the sodium aluminate slurry reaches 2.6-4.0. The resulting coarse grains of aluminum hydroxide have a high resistance to disintegration to fine powder when calcined.

REFERENCES:
patent: 2657978 (1953-11-01), Johnson
patent: 2707669 (1955-05-01), Houston et al.
patent: 3486850 (1969-12-01), Day
patent: 3649184 (1972-03-01), Featherston
patent: 3838980 (1974-10-01), Gnyra
patent: 3906084 (1975-09-01), Gnyra
patent: 4234559 (1980-11-01), Tschamper

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