Manufacture of gypsum board from FGD gypsum

Details Manufacture of gypsum board from FGD gypsum Manufacture of gypsum board from FGD gypsum

1983-10-19

1985-03-05

Dawson, Robert

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

106109, 423171, 428703, B32B 3106

Patent

active

045029016

ABSTRACT:
By-product gypsum, which is formed during a flue gas desulfurization process, (FGD gypsum) is carefully formed as an aqueous slurry of crystals having a mean particle diameter of between about 35 microns and 80 microns and filtered, which filter cake is substantially completely dried before calcination, without any substantial grinding action, the crystals are then flash calcined to a hemihydrate, then ground, to reduce consistency, and then formed into an aqueous slurry from which a paper-covered gypsum board is formed of superior core quality.

REFERENCES:
patent: 3445323 (1969-05-01), Schnabel
patent: 3836630 (1974-09-01), Noguchi et al.
patent: 3873492 (1975-03-01), Takehisa et al.
patent: 3956456 (1976-05-01), Keller et al.

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