Process for reducing radioactive contamination in phosphogypsum

Details Process for reducing radioactive contamination in phosphogypsum Process for reducing radioactive contamination in phosphogypsum

C - Chemistry, Metallurgy

01

F

23/104

C01F 11/46 (2006.01)

Patent

CA 1168418

ABSTRACT A process of two crystallization stages for reducing radioactive contamination of phosphogypsum is disclosed. In the process anhydrite crystals are obtained through dehydra- tion of the radiation containing phosphogypsum in strong sul- furic acid; a portion of the anhydrite crystals containing the radioactive contamination is converted to substantially radiation free gypsum by crystallizing out on a large solids concentration of radiation free gypsum seed crystals; and coarse radiation free gypsum crystals are separated from small anhydrite crystal relics containing substantially all of the radioactive contamination.

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