Processing equipment and method for pulverulant calcium...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 11/05 (2006.01) C04B 11/028 (2006.01) F27B 9/24 (2006.01)

Patent

CA 2219582

A method for processing a pulverulent calcium sulphate material in order to obtain a hydraulic binder is described, including combining the following two successive processing steps: (a) heating the pulverulent material in a curing tunnel (1) at a temperature of 220-360 ·C, under conditions suitable for primarily forming an .alpha.-type calcium sulphate, and (b) subjecting the heated material to a thermal quenching step in a cooling apparatus (2), with a cold, dry gas to stabilise the .alpha. anhydrite and to prevent its conversion into other crystallographic types. The method provides a novel hydraulic binder with an .alpha. anhydrite content of more than 35 wt.%, and with improved strength and behaviour in fire resistance properties.

L'invention concerne un procédé de traitement d'une matière pulvérulente à base de sulfate de calcium en vue de préparer un liant hydraulique. Ce procédé consiste à combiner deux étapes de traitement successifs: (a) chauffer la matière pulvérulente dans un tunnel de cuisson (1) à une température comprise entre 220 ·C et 360 ·C dans des conditions appropriées pour former majoritairement du sulfate de calcium de variété .alpha., (b) faire subir à la matière ainsi chauffée une trempe thermique dans un dispositif de refroidissement (2), au moyen d'un gaz froid et sec en vue de stabiliser l'anhydrite .alpha. et de bloquer son évolution vers d'autres variétés cristallographiques. Le procédé permet d'obtenir un nouveau liant hydraulique comprenant une proportion pondérale d'anhydrite .alpha. supérieure à 35 %, ayant des caractéristiques améliorées de tenue au feu et de résistance.

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