Calcined gypsum hydration enhancing additives

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/14 (2006.01) C04B 22/14 (2006.01) C04B 24/10 (2006.01) C04B 24/38 (2006.01)

Patent

CA 2359894

An additive for accelerating the setting reaction of gypsum products is disclosed. It comprises a gypsum accelerator combined with a bisulfate salt. The gypsum accelerator is calcium sulfate dihydrate. The accelerator may optionally be ground with a sugar, a starch and/or boric acid. A process utilizing this additive combination is also disclosed. The bisulfate salt is most advantageously prewet with a portion of the calcium sulfate hemihydrate feed before being combined with the gypsum accelerator, water and the remaining portion of the calcium sulfate hemihydrate feed in the main mixer.

L'invention concerne un additif permettant d'accélérer la réaction de durcissement de produits à base de gypse. Cet additif comprend un accélérateur de gypse combiné avec un sel de bisulfate. L'accélérateur de gypse est du sulfate de calcium bihydraté. Cet accélérateur peut éventuellement être broyé avec un sucre, un amidon et/ou un acide borique. L'invention concerne également un procédé utilisant cette combinaison d'additifs. Un mode de réalisation avantageux consiste à préhumidifier le sel de bisulfate à l'aide d'une portion d'alimentation de sulfate de calcium hémihydraté avant combinaison avec l'accélérateur de gypse, l'eau et la portion d'alimentation de sulfate de calcium hémihydraté restante dans le mélangeur principal.

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