Method for manufacturing a calcined gypsum and a gypsum board

Details Method for manufacturing a calcined gypsum and a gypsum board Method for manufacturing a calcined gypsum and a gypsum board

C - Chemistry, Metallurgy

04

B

C04B 11/024 (2006.01) C01F 11/46 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2656544

A process for calcined-gypsum production which attains a reduction in the amount of water to be mixed and does not prolong setting time. A raw-material gypsum is calcined after a carboxylic acid is incorporated thereinto, whereby calcined gypsum can be obtained which necessitates a smaller amount of water to be mixed therewith and needs no prolonged setting time. Even when recycled gypsum, which leads to an increase in the amount of water to be mixed, is used in a large amount as a raw material for gypsum, the calcined gypsum produced by the process is reduced in the amount of water to be mixed therewith and needs no prolonged setting time. Consequently, ordinary gypsum boards can be produced without lowering the productivity thereof.

L'invention concerne un procédé pour la production de gypse calciné qui permet une réduction de la quantité d'eau à mélanger et ne prolonge pas le temps de prise. Une matière première de gypse est calcinée après y avoir incorporé de l'acide carboxylique, ce qui permet d'obtenir du gypse calciné qui nécessite une quantité moindre d'eau pour le mélange et ne nécessite pas un temps de prise prolongé. Même lorsque on utilise en grande quantité du gypse recyclé qui entraîne une augmentation de la quantité d'eau à mélanger, en tant que matière première pour le gypse, le gypse calciné produit par le procédé nécessite une quantité d'eau à mélanger moindre et ne nécessite pas de temps de prise prolongé. De ce fait, il est possible de produire des plaques de plâtre ordinaires sans en diminuer la productivité.

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