Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal
Patent
1973-10-18
1976-06-01
Sebastian, Leland A.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Radioactive metal
423 7, 423 11, 423 15, 2523011W, C01G 4302, C02B 146
Patent
active
039610276
ABSTRACT:
Waste water containing large amounts of fluorides and ammonia and trace amounts of uranium, as is produced during the hydrolysis and ammonium hydroxide treatment of uranium hexafluoride (UF.sub.6) to produce ammonium diuranate (ADU) therefrom, is rendered suitable for cyclic reuse by initially treating the waste water with sufficient lime to precipitate substantially all of the fluorides present in the waste water to a relatively insoluble CaF.sub.2 precipitate, the treated solution is subjected to distillation to drive off ammonia for reuse in the ADU precipitation, the CaF.sub.2 precipitate is separated from the aqueous distilland leaving water with dissolved calcium, the distilland is treated by a cationic ion-exchange material to remove substantially all of the calcium and other cationic metal impurities and the resulting water containing small amounts of uranium, fluoride and ammonia is recycled to react with UF.sub.6 or to be combined with the ammonium hydroxide distillate and then treated with additional concentrated ammonium hydroxide to form a solution of the desired NH.sub.3 content for use in precipitating ADU. This recycling is most important for ecological reasons, and for cost improvement, as well as health and safety purposes.
REFERENCES:
patent: 3188169 (1965-06-01), Kraus et al.
patent: 3394997 (1968-07-01), Hollander
patent: 3758280 (1973-09-01), Pirk et al.
patent: 3842155 (1974-10-01), Muller et al.
Miller Edward A.
Randig R. T.
Sebastian Leland A.
Westinghouse Electric Corporation
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