Process for preparing calcined gypsum and gypsum board using lig

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

1979-11-05

1981-02-24

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

156 39, C04B 1114

Patent

active

042525683

ABSTRACT:
A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of an aqueous solution of ligno sulfonate; allowing the treated stucco to heal; and optionally drying the healed stucco and further optionally grinding the healed stucco. If the treated calcined gypsum is not to be used shortly after the healing procedure, it should be dried to provide storage stability. If further strength is desired the treated stucco should be ground to expose fresh crystal faces. The process is particularly useful in gypsum board manufacture and production of bagged building and industrial plasters.

REFERENCES:
patent: 3770468 (1973-11-01), Knauf et al.
patent: 4059456 (1977-11-01), De Rooy et al.
patent: 4117070 (1978-09-01), O'Neill
patent: 4153373 (1979-05-01), O'Neill
patent: 4169747 (1979-10-01), De Rooy et al.

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