Method of producing calcium sulfate semihydrate in conjunction w

Details Method of producing calcium sulfate semihydrate in conjunction w Method of producing calcium sulfate semihydrate in conjunction w

1983-10-28

1985-03-05

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423166, 423555, C01B 1700, C01F 100, C01F 1146

Patent

active

045030200

ABSTRACT:
Calcium sulfate dihydrate in large crystal form is produced by maintaining the circulation of the lime containing scrubbing solution in the desulfurization scrubbing of flue gases from a power plant boiler so that it has a residence time of 5 to 25 hours, preferably 15 hours. The crystals are moved by passing a portion of the recirculation through a thinner in which a sludge containing crystals with a mean particle size of which 90% is in excess of 100 microns is removed. This product can be dewatered and treated with sulfuric acid and steam to convert it to the alpha semihydrate and is free from sulfite.

REFERENCES:
patent: 2080779 (1937-05-01), Lessing
patent: 2090142 (1937-08-01), Nonhebel et al.
patent: 3808321 (1974-04-01), Fukui et al.
patent: 4374812 (1983-02-01), Atsukawa et al.

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