Process for producing tabular acicular gypsum crystals

Details Process for producing tabular acicular gypsum crystals Process for producing tabular acicular gypsum crystals

1988-09-14

1992-04-21

Lewis, Michael

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

23304, 423170, 423266, 423555, C01F 1146

Patent

active

051066009

ABSTRACT:
A process for economically producing tabular acicular gypsum crystals in a continuously stirred reactor is disclosed. The process involves establishing a steady state atmospheric pressure reaction zone of about 20% to about 25% by weight solids of gypsum crystals in water at a temperature of about 50.degree. C. to about 60.degree. C. with continuous mild agitation. Calcium sulfate hemihydrate is fed to the reaction zone at a rate to maintain a low level of supersaturation, and a suspension of gypsum crystals in water containing crystals of a mean particle length at least greater than 45 microns is withdrawn.

REFERENCES:
patent: 1962887 (1931-02-01), Ashley et al.
patent: 2177254 (1937-05-01), Heckert
patent: 3594123 (1971-07-01), Encke et al.
patent: 4029512 (1977-06-01), Juanarajs
patent: 4270954 (1981-06-01), Aignesberger et al.
patent: 4801355 (1989-01-01), Johnstone et al.

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