Pocess for the purification of phosphogypsum

Details Pocess for the purification of phosphogypsum Pocess for the purification of phosphogypsum

C - Chemistry, Metallurgy

01

F

23/103

C01F 11/46 (2006.01)

Patent

CA 1139079

ABSTRACT OF THE DISCLOSURE A process for purifying phosphogypsum by treating it in an aqueous medium with ozone, the ozone being used being equal to at least 150 parts per million by weight of the phospho- gypsum, calculated as CaSO4.2H2O. Attempts to whiten phospho- gypsum using a bleaching agent have been generally unsuccessful under industrial conditions, with handling and pollution problems being most difficult to solve. By the present process white phosphogypsum is obtained, with the foregoing problems being alleviated.

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