| 摘要 |
<p>Uranium hexafluoride is treated with water vapour at >100 degrees C., pref. 150-600 degrees C. The water vapour may be introduced into the furnace with the UF6, or may run counter-current to it, opt. diluted with an inert gas e.g. N2. The resulting fine UO2F2 is heated in water-oxygen-nitrogen mixtures to produce U3O8, or in water-hydrogen mixtures to produce UO2. The specific surface and sinterability of the oxides produced depend on the decompsn. temp. of the UF6, and of the UO2F2, and the relative concentrations of the gases used. Thus high nitrogen concentrations in the original decomposn., and high hydrogen concentrations in the UO2F2 decomposn. give fine powders. Sintered UO2 may be used as a nuclear fuel.</p> |
