由 AUC 及 ADU 制取 UO_2 的脱氟行为及机理

• 作 者: 宋正孝 黄锡文 谢振风 谌竟清 葛庆仁
• 出 处: 天津大学学报
• 发表日期: 1997年05期
• 关键词: 脱氟 ADU AUC UO_2 二氧化铀 重铀酸铵 纯氢 拟均相模型 动力学数据 铀酰

ＡＵＣ（三碳酸铀酰胺）及ＡＤＵ（重铀酸铵）在纯氢中进行分解及还原时，ＡＵＣ中的氟完全不能被脱去，而ＡＤＵ中的氟能被大部分脱去，但仍残留相当数量的氟不能被脱去．本文研究了ＡＵＣ及ＡＤＵ通过纯氢分解还原后制得的二氧化铀于５００℃～７００℃在５０％Ｈ２－５０％Ｈ２Ｏ气氛中的脱氟动力学．结果表明，脱氟动力学行为支持了Ｌｉｎｄｍａｎ提出的残留氟在二氧化铀中以固溶体形式存在的观点．动力学数据用拟均相模型处理可获得良好符合．

When AUC (uranyl tricarbonate) and ADU (uranyl ammonium urate) are decomposed and reduced in pure hydrogen, the fluorine in AUC can not be removed at all and the fluorine in ADU can be largely removed but remains A considerable amount of fluorine can not be taken off. In this paper, the kinetics of de-fluorination of uranium dioxide prepared from pure hydrogen decomposition and reduction of AUC and ADU at 500 ℃ ~ 700 ℃ in a 50% H2-50% H2O atmosphere was studied. The results show that the kinetic behavior of defluorination supports the viewpoint of Lindman that residual fluorine exists as solid solution in uranium dioxide. Kinetic data can be well matched with quasi-homogeneous model.