Process for reducing formation of gypsum scale durng the washing

Details Process for reducing formation of gypsum scale durng the washing Process for reducing formation of gypsum scale durng the washing

1974-11-08

1977-09-20

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423319, 423320, 423555, C01B 2522

Patent

active

040497747

ABSTRACT:
A process for reducing formation of calcium sulphate scale during the washing of calcium sulphate hemihydrate crystals by washing the crystals with a liquor containing certain surface-active agents in sufficient amount to give a concentration of from 0.0002 to 1% by weight of surface-active agent in the wash liquors.

REFERENCES:
patent: 3192014 (1965-06-01), Leyshan et al.
patent: 3238142 (1966-03-01), Perry
patent: 3594123 (1971-07-01), Encke et al.
patent: 3598755 (1971-08-01), McBroom et al.
patent: 3645677 (1972-02-01), Akazawa et al.
patent: 3796790 (1974-03-01), Sirianni et al.
patent: 3801699 (1974-04-01), Arnold
patent: 3972981 (1976-08-01), Harper et al.

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