Process for preparing virtually phase-pure calcium sulphate...

Details Process for preparing virtually phase-pure calcium sulphate... Process for preparing virtually phase-pure calcium sulphate...

C - Chemistry, Metallurgy

01

F

C01F 11/46 (2006.01) C04B 11/02 (2006.01)

Patent

CA 2209589

The invention relates to a process for preparing virtually phase-pure calcium sulphate .beta.-hemihydrate in which finely particulate calcium sulphate dihydrate in the dry state is continuously partially dewatered by appropriate action of heat in a calcination apparatus. In this process, the finely particulate calcium sulphate dihydrate is heated in a first stage to a temperature of from about 110 to 140°C and then, in a second stage, held at a temperature of from 110 to 140°C under a water vapour atmosphere until virtually phase-pure calcium sulphate .beta.-hemihydrate is obtained.

Méthode pour préparer un sulfate de calcium semi-hydraté bêta sous forme de phase quasi pure, dans laquelle des particules fines de sulfate de calcium dihydraté à l'état sec sont déshydratées partiellement et en continu par application de chaleur dans un appareil de calcination. Les particules fines de sulfate de calcium dihydraté sont d'abord chauffées à une température de 110-140 degrés C, puis maintenues dans cette plage de température, sous une atmosphère de pression de vapeur, jusqu'à obtention du sulfate de calcium semi-hydraté bêta sous forme de phase quasi pure.

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