Process for preparing pure synthetic calcium sulfate semihydrate

Details Process for preparing pure synthetic calcium sulfate semihydrate Process for preparing pure synthetic calcium sulfate semihydrate

1976-11-10

1978-09-12

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423166, 423167, 423555, C01F 1146

Patent

active

041138350

ABSTRACT:
A process for the purification of phosphate containing impure gypsum to obtain therefrom calcium sulfate semihydrate in a purified form by digesting the phosphate containing gypsum with nitric acid at a temperature between 22.degree. and 100.degree. C, the temperature and nitric acid concentration being regulated such as to dissolve most of the phosphate impurities and to allow the recovery of calcium sulfate semihydrate.

REFERENCES:
patent: 1756637 (1930-04-01), Edwards
patent: 1866571 (1932-07-01), Larsson
patent: 3773533 (1973-11-01), Omoto et al.

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