C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/227, 31/89
C01G 43/01 (2006.01) G21C 3/62 (2006.01)
Patent
CA 1109663
ABSTRACT OF THE DISCLOSURE A process of 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 ~ sufficient amount of an ammonium hydroxide solution to convert the ammonium diuranate precursors to ammonium diuranate, and then (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 r 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.
293779
Company General Electric
Eckersley Raymond A.
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