Conversion of fluoroanhydrite to plaster

Details Conversion of fluoroanhydrite to plaster Conversion of fluoroanhydrite to plaster

C - Chemistry, Metallurgy

04

B

261/79

C04B 11/024 (2006.01)

Patent

CA 1206980

CONVERSION OF FLUOROANHYDRITE TO PLASTER Abstract of the Disclosure Gypsum plaster and gypsum wallboard products can be made from fluoroanhydrite by contacting the fluoroanhydrite with a reactive silica selected from the group consisting essen- tially of Portland cement; perlite; calcium, sodium or potas- sium silicates; pyrogenic colloidal silica and diatomaceous earth; and after gradual conversion of the fluoroanhydrite to substantially pure fluorogypsum, the purified gypsum is pro- cessed in customary fashion in the industrial manufacture of plaster products. The reactive silica may be added to the fluoroanhydrite during the gradual aging conversion in water to fluorogypsum; or it may be added during water calcination of the fluorogypsum to stucco; or to the gauging water during gypsum plaster or wallboard product formation from the fluorostucco.

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