Process for preparing calcined gypsum and gypsum board

Details Process for preparing calcined gypsum and gypsum board Process for preparing calcined gypsum and gypsum board

C - Chemistry, Metallurgy

01

F

23/103, 25/104

C01F 11/46 (2006.01) C03C 3/102 (2006.01) C04B 11/00 (2006.01)

Patent

CA 1103890

Abstract of the Disclosure A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of water (about 1-10% by weight) to the calcined gypsum, allowing it to heal, and grinding the healed stucco to recapture the rate of strength development and the ultimate strength which are adversely affected by the water addition. The principal advantage provided by the addition of small portions of water is a reduction in water demand which is retained despite the grinding and optional drying of the healed stucco. If the treated calcined gypsum is not used shortly after the healing procedure, it should be dried to provide storage stability. The reduced water demand is particularly useful in gypsum board manufacture.

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