Defluorination behavior and mechanism of uranium dioxide
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The residual fluorine in ammonium uranyl tricarbonate (AUC) cannot be removed, while a large part of residual fluorine in ammonium diuranate (ADU) can be removed, when AUC and ADU are decomposed and reduced under dry hydrogen atmosphere. UO2 was prepared by decomposing and reducing AUC and ADU in dry hydrogen atmosphere. The defluorination kinetics of UO2 at 500–700°C in atmosphere of 50% H2-50% H2O was investigated. The results show that the defluorination kinetics supports the Lindman's assertion that the residual fluorine forms a solid-solution in UO2.
KeywordsHydrogen Atmosphere Ammonium Physical Chemistry Dioxide
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- 1.1980 Annual Book of ASTM Standards, Part 45, Philadelphia, p. 406.Google Scholar
- 2.Cai Shisi, Shu Baohua, The Peparation of Ceramic-grade UO2 (China), Atomic Energy Press, Beijing, 1987, p. 160.Google Scholar
- 3.Wu Guanhe, Li Lifang, Chen Yunji, Nucl. Ener. Eng., 9 (1988) 85.Google Scholar
- 4.A. Deptul, J. Rebandel, W. Drozda, Nukleonika, 20 (1975) 1009.Google Scholar
- 5.Chang I. S., Do J. B., Choi Y. D., Par N. H., Korea Atomic Research Institute, Rep. KAERI/RR/295/81, 1981.Google Scholar
- 7.Wu Yongqi, Master Thesis of Tianjin University (China), 1987, p. 44.Google Scholar
- 8.Peng Lusheng, The Meeting Document on Uranium Metallurgy and Analysis (China), Atomic Energy Press, Beijing, 1976, p. 52.Google Scholar
- 9.Ge Qingren, Xie Zhenfeng, Kang Shifang, J. Chem. Ind. Eng. (China), 41 (1990) 138.Google Scholar
- 10.O. Levenspiel, Chemical Reaction Engineering, 2nd ed. John Wiley, New York, 1972, p. 46.Google Scholar