Process for producing calcium sulfate

Details Process for producing calcium sulfate Process for producing calcium sulfate

C - Chemistry, Metallurgy

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F

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C01F 11/46 (2006.01) C04B 11/02 (2006.01) C04B 11/024 (2006.01) C09C 1/02 (2006.01)

Patent

CA 1115025

ABSTRACT OF THE DISCLOSURE A process for producing .alpha.-type calcium sulfate hemi- hydrate or calcium sulfate anhydrite or calcium sulfate dihydrate by a hydrothermal reaction of a starting material of calcium sul- fate in an aqueous medium. The calcium sulfate produced is in either fibrous and/or spherical form. The .alpha.-type calcium sulfate is produced efficiently by adding a powdery inorganic substance to a slurry of the starting material. The addition of the powdery inorganic substance advantageously eliminates difficulties in- volved in the control of the hydrothermal reaction experienced with conventional processes. The addition of the powdery inorganic substances also enables production of spherical calcium sulfate under conditions unsuitable therefore under conventional processes.

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