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高温氟化挥发技术是分离回收乏燃料中易裂变材料铀的干法分离技术。本研究建立了基于红外光谱技术的高温氟化挥发工艺中气相产物在线检测的技术。利用此技术发现在UF4氟化挥发反应过程中,除了UF6之外,还有Mo F6、UO2F2和HF的生成。根据这些产物相对浓度随反应进程的变化,讨论了它们可能的来源。实验工作表明红外光谱技术不仅能够用于高温氟化挥发工艺中氟化反应过程的在线监测和研究,而且可以通过装置结构材料腐蚀产物Mo F6、UF6水解产物UO2F2和HF的在线检测进一步优化工艺流程。
The high-temperature fluorination and volatilization technology is a dry separation technology for separating and recovering uranium which is a fissile material in spent fuel. In this study, we established the on-line gas detection technology based on infrared spectroscopy in high temperature fluorination and volatilization process. Using this technique, it was found that in addition to UF6, the formation of Mo F6, UO2F2 and HF during the UF4 fluorination volatilization reaction. According to the relative concentration of these products with the reaction process changes, discuss their possible sources. Experimental work shows that infrared spectroscopy can not only be used for on-line monitoring and research of fluorination reaction in high temperature fluorination and volatilization process, but also can be further optimized through on-line detection of structural material corrosion products Mo F6 and UF6 hydrolyzate UO2F2 and HF .