| 摘要 |
<p>A process for treating the aqueous effluents that are produced in converting gaseous UF6 (uranium hexafluoride) into solid UO2 (uranium dioxide) by way of an intermediate (NH4)4 UO2 (CO3) 3 ("AUC" Compound) is disclosed. These effluents, which contain large amounts of NH 4<+> (ammonium), CO3<--> (carbonate), F<-> (fluoride), and a small amount of U (uranium), are mixed with H2SO4 (sulfuric acid) in order to expel CO2 (carbon dioxide) and thereby reduce the carbonate concentration. The uranium is precipitated through treatment with H2O2 (hydrogen peroxide) and the fluoride is easily recovered in the form of CaF2 (calcium fluoride) by contacting the process liquid with CaO (calcium oxide). The presence of SO4<--> (sulfate) in the process liquid during CaO contacting seems to prevent the development of a difficult-to-filter colloid. The process also provides for NH3 (ammonia) recovery and recycling. Liquids discharged from the process, moreover, are essentially free of environmental pollutants. The waste treatment products, i.e. CO2, NH3, and U are economically recovered and recycled back into the UF6->UO2 conversion process. The process, moreover, recovers the uranium as a precipitate in the second stage. This precipitate is a new inorganic chemical compound UO4.2NH3.2HF [uranyl peroxide-2-ammonia-2- (hydrogen fluoride)].</p> |
