Method of producing calcium sulfate dihydrate in conjunction...

Details Method of producing calcium sulfate dihydrate in conjunction... Method of producing calcium sulfate dihydrate in conjunction...

C - Chemistry, Metallurgy

01

F

23/104

C01F 11/46 (2006.01) B01D 53/50 (2006.01)

Patent

CA 1195090

ABSTRACT OF THE DISCLOSURE 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.

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