Method for treating a particulate nuclear fuel material

Details Method for treating a particulate nuclear fuel material Method for treating a particulate nuclear fuel material

1976-11-08

1980-11-18

Padgett, Benjamin R.

Chemistry of inorganic compounds

Radioactive

Uranium compound

423 15, 423 19, C01G 4302

Patent

active

042345502

ABSTRACT:
A process for treating a particulate uranium oxide composition containing ammonium diuranate precursors such as uranyl fluoride and uranyl nitrate, along with possible impurities, is disclosed. The process comprises the steps of (a) contacting the composition with a sufficient amount of an ammonium hydroxide solution to convert the ammonium diuranate precursors to ammonium diuranate, and (b) heating the composition under a controlled atmosphere at a temperature sufficient to dry the composition, sublime any ammonium fluoride present, and convert the ammonium diuranate to uranium dioxide. In a first modification of the invention, there is practiced the additional step of moving the composition, preferably by mechanically agitating the composition, prior to the heating step, or during the heating step, or both prior to and during the heating step, for a sufficient time to produce rounded agglomerates in the form of a readily flowable powder. In another modification of the invention, there are practiced the additional steps of mechanically agitating the composition and screening the composition prior to heating. These additional steps produce rounded agglomerates of the composition in a desired size distribution.

REFERENCES:
patent: 2953430 (1960-09-01), Leaders et al.
patent: 3393055 (1968-07-01), Stevenson
patent: 3579311 (1971-05-01), McCoy
patent: 3786120 (1974-01-01), DeHollander et al.
patent: 3872022 (1975-05-01), DeHollander et al.

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