CAJ | 학술논문

研究了ADU转化为U3 O8粉末过程中的脱氟及动力学。结果表明：脱氟温度和脱氟气氛对U3 O8粉末中氟质量分数影响很大，温度越高、水蒸气流量越大，对脱氟越有利；ADU 中的氟主要以挥发性气体 N H4 F和铀氟化合物UO2 F2形式存在，易除去，而残留的少量氟与铀氧化物结合成固溶体，很难去除；脱氟动力学行为验证了Lindman提出的氟在铀氧化物中以固溶体形式存在的观点；在850℃、70％ H2 O‐30％ N2气氛中脱氟150 min以上，U3 O8粉末中氟、氯质量分数均低于2μg／gU ；工艺稳定可靠，满足生产医用同位素溶液堆的要求。
연구료ADU전화위U3 O8분말과정중적탈불급동역학。결과표명：탈불온도화탈불기분대U3 O8분말중불질량분수영향흔대，온도월고、수증기류량월대，대탈불월유리；ADU 중적불주요이휘발성기체 N H4 F화유불화합물UO2 F2형식존재，역제거，이잔류적소량불여유양화물결합성고용체，흔난거제；탈불동역학행위험증료Lindman제출적불재유양화물중이고용체형식존재적관점；재850℃、70％ H2 O‐30％ N2기분중탈불150 min이상，U3 O8분말중불、록질량분수균저우2μg／gU ；공예은정가고，만족생산의용동위소용액퇴적요구。
T he paper describes the defluorination and mechanism during preparing U3 O8 using ADU . The results show that the defluorination temperature and atmosphere affect great fluorine content in U3O8 powder .The higher the temperature and the greater the water vapor flow ,the better defluoriation .The fluoride in ADU mainly exists as volatile gas NH4 F and UO2 F2 and is removed easily .But ,a small amount of residual fluorine combined with uranium oxides into solid‐solution is removed difficultly .The defluorination kinetics holds up Lindman’s view piont that residual fluorine exists in the form of solid‐solution .At 850 ℃ ,in 70% H2 O‐30% N2 atmosphere ,more than 150 min , fluorine and chlorine content in U3 O8 is less than 2 μg/gU .This process is steady and meets the requiements of the fluorine and chlorine content of medical isotopes solution reactor .