Dense phase precipitation

Details Dense phase precipitation Dense phase precipitation

1979-01-18

1985-07-23

Bernstein, Hiram H.

Chemistry: physical processes

Physical processes

Crystallization

23305A, C30B 902

Patent

active

045306990

ABSTRACT:
A system for the precipitation of Al(OH).sub.3 from green liquor is provided which comprises process and apparatus for feeding the green liquor into the bottom of a chamber containing a supersaturated solution of alumina and Al(OH).sub.3 seed particles. The flow of green liquor into the bottom of the chamber is maintained at a rate sufficient to suspend the seed particles in the chamber with minimum turbulence so that the liquor is in approximately plug flow. As Al(OH).sub.3 precipitates on the seed particles, the particles grow larger and gradually move to the bottom of the chamber where they are removed. The solution, somewhat depleted with respect to Al.sub.2 O.sub.3, overflows the chamber to return to the process.

REFERENCES:
patent: 1943786 (1934-01-01), Cowles
patent: 2219776 (1940-10-01), Henderson
patent: 2653858 (1953-09-01), Brown
patent: 4049773 (1977-09-01), Mejdell et al.
Chemical Abstracts, vol. 52, p. 17635(c).

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