Process for producing .alpha.-type calcium sulfate hemihydrate

Details Process for producing .alpha.-type calcium sulfate hemihydrate Process for producing .alpha.-type calcium sulfate hemihydrate

1975-09-24

1978-01-17

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

106110, 423166, 423171, C01F 1146, C04B 1102

Patent

active

040693007

ABSTRACT:
A process for producing .alpha.-type hemihydrate calcium sulfate by oxidizing calcium sulfite with an oxidizing agent in a suspension containing at least one anionic, nonionic or amphoteric surface active agent.

REFERENCES:
patent: RE21631 (1940-11-01), Johnstone
patent: 2044942 (1936-06-01), Heckert
patent: 2086379 (1937-07-01), Clark
patent: 3410655 (1968-11-01), Ruter
patent: 3808321 (1974-04-01), Fukui et al.
patent: 3904742 (1975-09-01), Akimoto

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