Lump process alpha gypsum

Details Lump process alpha gypsum Lump process alpha gypsum

C - Chemistry, Metallurgy

01

F

23/103

C01F 11/46 (2006.01) C04B 11/032 (2006.01)

Patent

CA 1139919

APPLICATION FOR LETTERS PATENT FOR IMPROVED LUMP PROCESS ALPHA GYPSUM ABSTRACT OF THE DISCLOSURE An improved "lump" process for producing alpha gypsum, calcium sulfate hemihydrate, from natural gypsum rock of the type wherein lumps of gypsum rock particles (a minimum of about 1/2 inch or 1.3 cm. in size) are calcined to low water demand alpha hemihydrate by autoclaving in a saturated steam atmosphere, quickly dried and pulverized is disclosed. The improvement allows the thorough processing of natural gypsum as large sized particles or containing considerable selenite and includes the steps of initiating calcination without crystal habit modifier and, after hemihydrate formation has commenced! adding crystal habit modifier and completing calcination under increased steam pressure.

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