Ozone whitening of synthetic gypsum

Details Ozone whitening of synthetic gypsum Ozone whitening of synthetic gypsum

1981-01-15

1982-08-17

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

8111, 106109, 156 39, 423166, 423264, 423555, C04B 1100, C04B 1102, C01F 1146

Patent

active

043449255

ABSTRACT:
A process for the whitening of phosphogypsum comprising treating a phosphogypsum in aqueous suspension with an amount of ozone equal to at least 150 parts by weight per million parts by weight of phosphogypsum calculated as Ca SO.sub.4.2H.sub.2 O, the pH of the aqueous suspension being lower than or equal to 3, to yield a whiteness grade of phosphogypsum higher than 75, according to French Standard NF Q 03-038.

REFERENCES:
patent: 1548358 (1925-08-01), Edwards
patent: 2197003 (1940-04-01), Mowlds
patent: 3616900 (1971-11-01), Cecil
patent: 3951675 (1976-04-01), Krempff
patent: 4113835 (1978-09-01), Kurandt et al.

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