Process for producing gypsum building materials

Details Process for producing gypsum building materials Process for producing gypsum building materials

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) C04B 38/10 (2006.01)

Patent

CA 2057263

The invention relates to a process for producing light-weight, panel- or block-shaped gypsum building materials provided with a pore structure, in particular wall panels, calcium sulphate alpha-hemihydrate, water in a slightly more than stoichiometric quantity and, if appropriate, setting retarders and/or accelerators for gypsum and additives being mixed to form a pourable suspension and being subjected to suitable forming, wherein ground calcium sulphate alpha-hemihydrate having a Blaine specific surface area greater than 2000 cm2/g, if appropriate together with calcium sulphate beta-hemi- hydrate in a quantity of up to about 30% by weight, relative to the calcium sulphate alpha-hemihydrate, and a previously prepared surfactant foam of a defined apparent density in the range from 40 to 80 kg/m3 and a uniform defined pore size, which foam is mixed into the suspension before forming in a quantity for adjusting the apparent density of the gypsum building material to a defined value in the range from 300 to 1200 kg/m3, are used.

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