CCl_(4)和HCl气体氯化铀氧化物  

Investigation on Chlorination of Uranium Oxides With CCl_(4) and HCl Gas

作　　者：孟照凯[1] 林如山[1] 陈辉[1] 宋文臣 张金宇 姚本林 何辉[1] 叶国安[1] MENG Zhao-kai;LIN Ru-shan;CHEN Hui;SONG Wen-chen;ZHANG Jin-yu;YAO Ben-lin;HE Hui;YE Guo-an(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2022年第2期170-177,共8页Journal of Nuclear and Radiochemistry

基　　金：中国原子能科学研究院稳定性支持经费科研项目(BJ19001203)。

摘　　要：分别以CCl_(4)和HCl气体作为氯化试剂,进行了铀氧化物(主要为U_(3)O_(8))的氯化机理和各影响因素研究。以CCl_(4)为氯化试剂对U_(3)O_(8)粉末进行氯化,通过热重分析研究了氯化反应过程的机理及动力学行为,氯化产物主要为UCl_(4)。同时研究了CCl_(4)对不同种类和形态铀氧化物的氯化,UO_(2)芯块由于结构致密很难进行氯化,UO_(2)粉末和UO_(3)粉末很容易被CCl_(4)氯化,产物分别为UCl_(4)和UCl_(6)。以HCl气体为氯化试剂对LiCl-KCl熔盐中的U_(3)O_(8)粉末进行氯化,研究了反应温度、氯化时间、HCl气体流速、U_(3)O_(8)粉末投料量以及铀氧化物种类和形态的影响。结果表明,提高反应温度、延长反应时间、提高HCl气体流速,有利于氯化率的提高。推荐HCl气体氯化U_(3)O_(8)粉末的工艺参数为:氯化反应温度为500℃、HCl气体流速为0.6 L/min。In this study,the chlorination mechanism and influencing factors of uranium oxides(mainly U_(3)O_(8))were studied by using CCl_(4)and HCl gas as chlorination reagents respectively.The chlorination of U_(3)O_(8)powder was studied with CCl_(4)as chlorination reagent.The mechanism and kinetic behavior of the chlorination reaction were studied by thermogravimetric analysis.The main chlorination product is UCl_(4).The chlorination of different types and morphologies of uranium oxide by CCl_(4)was also studied.The UO_(2) pellets are difficult to chlorinate due to their very dense structure.UO_(2) powder and UO_(3) powder are easily chlorinated by CCl_(4),and the chlorination products are UCl_(4)and UCl_(6)respectively.The chlorination of U_(3)O_(8)powders in LiCl-KCl molten salt system was carried out using HCl gas as the chlorination reagent.The effects of reaction temperature,chlorination time,HCl gas flow rate,feeding amount of U_(3)O_(8)powder,and uranium oxide types and morphologies were studied.The results show that increasing the reaction temperature,prolonging the reaction time,and increasing the HCl gas flow rate are beneficial to the improvement of the chlorination rate.The process parameters of HCl gas chlorinated U_(3)O_(8)powder are recommended as follows:the chlorination reaction temperature is 500℃,and the flow rate of HCl gas is 0.6 L/min.

关 键 词：铀氧化物 氯化试剂 CCl_(4) HCL气体 

分 类 号：TL241.2[核科学技术—核燃料循环与材料]