研究了采用氯化铵焙烧氯化氧化钐的热力学、反应过程、适宜条件和动力学.结果表明:氯化铵焙烧氯化氧化钐(单斜)在热力学上是可行的,反应自发进行的最低温度为521.8 K,当温度高于576.89 K时Sm_2O_3(s)完全转化为SmCl_3(s);氯化反应的适宜条件为n_(NH_4Cl)∶n_(Sm_2O_3)=12∶1、T=350±10℃和t=40 min,氯化率为100%,使用2倍理论量的氯化铵是提高氯化率的关键;氯化反应动力学符合Bagdasarrym模型,反应进度遵从Erofeev方程,反应的表观活化能Ea为58.275 k J·mol~(-1),频率因子A_0为1.48×10~4,反应过程是界面化学反应控制.
【英文摘要】
Chlorination of Sm_2O_3 with NH_4Cl roasting method is researched. The research content in this workincludes thermodynamic feasibility,reaction process,suitable conditions and chlorination reaction kinetics. Theexperimental results indicate that the reaction is feasible in the thermodynamics. Initial temperature of chlorinationreaction is 521.8 K and chlorination reaction is basically completed in the theory about 576.89 K. Suitable conditionsof chlorination reaction are as follows:the best ratio of n_(NH_4...