Lump process alpha gypsum

Details Lump process alpha gypsum Lump process alpha gypsum

1980-12-03

1982-01-05

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

106110, 423555, C04B 1102, C01F 1146

Patent

active

043093914

ABSTRACT:
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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patent: 2418590 (1947-04-01), Linzell et al.
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patent: 3081152 (1963-03-01), Johnson
patent: 3437330 (1969-04-01), Worner
patent: 4234345 (1980-11-01), Fassle

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