Method for the production of alpha type calcium sulfate hemihydr

Details Method for the production of alpha type calcium sulfate hemihydr Method for the production of alpha type calcium sulfate hemihydr

1976-10-14

1978-05-23

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

23300, 423171, C01F 1146, B01J 1700

Patent

active

040910806

ABSTRACT:
Alpha type calcium sulfate hemihydrate gypsum is obtained by suspending gypsum in an aqueous solution containing a specific monocarboxylate in a specific concentration and heating the resultant suspension in a specific temperature range under atmospheric pressure. The production of this alpha type calcium sulfate hemihydrate is accomplished at an increased rate by adding a specific monocarboxylic acid to the aqueous solution, suspending gypsum in the resultant solution and heating the resultant suspension in a specific temperature range under atmospheric pressure.

REFERENCES:
patent: 2006342 (1935-07-01), Booge et al.
patent: 2316343 (1943-04-01), Kubeka et al.
patent: 3337298 (1967-08-01), Ruter et al.
Mellor, A Comprehensive Theatise on Inorganic & Theoritical Chemistry, 1922, vol. 3, pp. 768-769, Longmans Green & Co., N.Y., N.Y.

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