Process for reducing radioactive contamination in phosphogypsum

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

1981-12-14

1983-06-14

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423 2, 423 11, 423167, 423170, 423321R, 106109, 252626, C01F 1146, C01F 1300, C01B 2516, G21F 928

Patent

active

043882927

ABSTRACT:
A process of two crystallization stages for reducing radioactive contamination of phosphogypsum is disclosed. In the process anhydrite crystals are obtained through dehydration of the radiation containing phosphogypsum in strong sulfuric 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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Takatsu et al., Some Factors Related to the Hydration of Anhydrite, Sekko to Sekkai, #75, pp. 314-317, 1965.
Leininger et al., Rapid Conversion of Anhydrite to Gypsum 1 & EC, vol. 49, #5, May 1957, pp. 818-821.
Conley, Robert F., The Hydration Reaction of Anhydrite, PhD Thesis, Indiana University, Sep. 1958.

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