G - Physics – 21 – C
Patent
G - Physics
21
C
31/89
G21C 3/62 (2006.01) C04B 35/51 (2006.01) C04B 35/64 (2006.01)
Patent
CA 1063339
ABSTRACT OF THE DISCLOSURE Compacted pallets of uranium oxide of uranium oxide with one or more additives are heated in a kiln in a process having a preheating step, a sintering step, a reduction step, and a cooling step in a controlled at- mosphere. The process is practiced to give a range of temperature and atmosphere conditions for obtaining optimum fluoride removal from the compacted pellets along with optimum sintering in a single process. The preheating step of this process is conducted in a tem- perature range of about 600 to about 900°C and the pellets are held for at least twenty minutes, and preferably about 60 minutes, in an atmosphere having a composition in the range of about 10 to about 75 percent hydrogen by volume with the balance being carbon dioxide. The sintering step is conducted at the temperature in the range of about 900°C to 1500°C in the presence if an atmosphere having a composition in the range of about 0.5 to about 90 present hydrogen by volume with the balance being carbon dioxide. The reduction step reduces the hydrogen to metal ratio of the pellets to a range of about 1.98 to 2.10:1 and this is accomplished by gradually cooling the pellets for about 30 to about 120 minutes from the temperature of the sintering step to about 1100°C in an atmosphere of about 10 percent to about 90 percent hydrogen by volume with the balance being carbon dioxide. Thereafter the pellets are cooled to about 100°C under a protective atmosphere and in one preferred practice the same atmosphere used in the reduction step is used in the cooling step. The preheating, sintering and reduction steps may also be conducted with their respective atmosphere having an initial additional component of water vapor and the water vapor can comprise up to about 20 percent by volume.
248385
Jensen Neil J.
Nivas Yogesh
Packard Douglas R.
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