Calcining calcium sulphate dihydrate

C - Chemistry – Metallurgy – 04 – B

Patent

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23/103, 39/34

C04B 11/02 (2006.01) C04B 11/028 (2006.01) F27D 7/02 (2006.01)

Patent

CA 1167641

A B S T R A C T Method and apparatus for the continuous calcination of calcium sulphate dihydrate (gypsum) to hemihydrate plaster by heating A bed of gypsum in a kettle to the required calcination temperature at least in part by means of hot gas continuously introduced into the bed, moisture (e.g. in the form of water droplets or steam) being sprayed into the gaseous phase (e.g. into the hot gas before contact with the bed and/or into exhaust gas above the bed) to reduce the degree of production of insoluble anhydrite.

389818

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