Calcium sulphate-based compositions and methods of making same

Details Calcium sulphate-based compositions and methods of making same Calcium sulphate-based compositions and methods of making same

C - Chemistry, Metallurgy

01

F

C01F 11/46 (2006.01) C04B 2/10 (2006.01) C04B 9/04 (2006.01) C04B 11/00 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2519961

Disclosed is an improved alpha calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4.bullet.1/2H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrate (CaSO4.2H2O) into a briquette under high pressure, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha- type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.

L'invention concerne un sulfate de calcium alpha semi-hydraté amélioré ; des procédés de production d'un composé amélioré de sulfate de calcium semi-hydraté pulvérulent (CaSO¿4? ?H¿2?O) [de type alpha]. Au moins un procédé comporte les étapes consistant à : façonner en briquette sous haute pression du sulfate de calcium dihydraté (CaSO¿4? 2H¿2?O) ; calciner la briquette pour transformer le sulfate de calcium dihydraté en sulfate de calcium semi-hydraté [de type alpha] ; sécher la briquette de sulfate de calcium semi-hydraté [de type alpha] ; et éventuellement broyer la briquette. L'invention concerne aussi des procédés de production d'un enduit de plâtre amélioré qui consistent à produire le sulfate de calcium semi-hydraté [de type alpha] pulvérulent décrit, et à mélanger celui-ci avec de l'eau.

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