System for removing solids from a used lime or limestone slurry

Details System for removing solids from a used lime or limestone slurry System for removing solids from a used lime or limestone slurry

1980-11-10

1981-10-13

Bernstein, Hiram

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

23301, 23304, B01D 902

Patent

active

042948070

ABSTRACT:
The flue gas desulfurization process using a lime or limestone slurry scrubbing solution producing used liquor containing calcium sulfite or sulfate (typically gypsum). Precipitated particles are removed by feeding the used scrubbing liquor to an agitated crystallization zone to grow crystals and directing part of the used scrubbing liquor from that zone to a quiescent crystallization zone, in which particles are settled back into the agitated zone. An underflow stream from the agitated zone containing large crystals is combined with an overflow stream from the quiescent zone, which combined stream is clarified with the fines being returned to the scrubber and the large crystals being removed as a waste product. Apparatus for performing the above process in which the agitated and quiescent crystallization zones form part of a single crystallization vessel, and the two zones are separated by a baffle.

REFERENCES:
patent: 3873532 (1975-03-01), Dahlstrom et al.
patent: 3876750 (1975-04-01), Hauser
patent: 4150096 (1979-04-01), Nelms et al.
patent: 4213946 (1980-07-01), Furuta et al.

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