UO₂ 在碳酸盐熔盐中的反应行为研究

To obtain basic reaction data for UO₂ in an alkali metal molten carbonate system, we investigated the equilibrium concentration and reaction behavior of UO₂ in molten carbonate using inductively coupled plasma mass spectrometry, X-ray diffraction, infrared spectroscopy and some other characterization methods. The results show that the equilibrium concentrations of uranium under the above conditions exhibited a “V” shaped distribution in the temperature range of 500~700 ℃, which were in the range of 20~220 μg/ g. The minimum uranium concentration was below 30 and 60 μg/ g (at 600 ℃) in the binary and ternary molten salt systems, respectively. The UO₂ reaction products in molten carbonate were mainly diuranates (<700 ℃). The reaction behavior of UO₂ in the molten carbonate system was systematically analyzed to verify the feasibility of oxidizing UO₂ using molten carbonate oxidation technology, which provides basic data to support the development of this technology.