Process for reducing the radioactivity of calcium sulfate prepar

Details Process for reducing the radioactivity of calcium sulfate prepar Process for reducing the radioactivity of calcium sulfate prepar

1981-06-11

1983-08-16

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423170, 423 15, 423 18, 423 20, 423319, 423321R, 423555, 106109, C01F 1146, C01F 512, C01B 2516, C01G 4300

Patent

active

043991106

ABSTRACT:
The level of radioactivity in gypsum produced from phosphate rock can be reduced by adding to the slurry of acid and phosphate rock in the conventional process for producing phosphoric acid a combination of concentrated nitric acid or hydrochloric acid and an ammonium salt, especially ammonium nitrate or ammonium phosphate, before the precipitation of the calcium sulfate.

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patent: 1856187 (1932-05-01), Johnson
patent: 1936316 (1933-11-01), Wadsted
patent: 3382035 (1968-05-01), Slater
patent: 3880980 (1975-04-01), Wamser
patent: 3919395 (1975-11-01), Hauge
patent: 4012491 (1977-03-01), Hauge
patent: 4073635 (1978-02-01), Suppanen
patent: 4180545 (1979-12-01), McCullough et al.
patent: 4301122 (1981-11-01), Johnson
patent: 4311677 (1982-01-01), Geruwda et al.
patent: 4328193 (1982-05-01), Larson
patent: 4353877 (1982-10-01), Rendall

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