SiCl_4作用下氟碳铈精矿的碳热氯化动力学  

Kinetic Study on Carbochlorination of Bastnaesite Concentrate in the Presence of SiCl_4

作　　者：张丽清[1] 王之昌[2] 姜琳琳[1] 王小欢[1] 张风春[1] 

机构地区：[1]沈阳化工学院应用化学学院,辽宁沈阳110142 [2]东北大学理学院,辽宁沈阳110006

出　　处：《过程工程学报》2007年第2期298-301,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金(编号:5987400850574023);辽宁省教育厅科学研究计划基金(编号:20040294)

摘　　要：以活性炭为还原剂、Cl_2为氯化剂、SiCl_4为脱氟剂,研究氟碳铈矿的碳热氯化反应动力学．在500℃以下,氟碳铈矿的氯化率较低;随反应温度和脱氟剂用量的增加,稀土氯化率增加．但随着氯化反应的进行,温度的影响逐渐减弱．在450～650℃之间,在脱氟剂SiCl_4作用下,稀土的氯化率由36％增至98％,氟碳铈矿的碳热氯化反应可在低温下进行．碳热氯化反应符合未反应核模型,反应模型的数学表达式为kt=1-(1-x)^(1/3),反应的表观活化能为42．5 kJ/mol．A carbochlorination process of bastnaesite concentrate was investigated by using activated carbon powder as reductant, Cl2 as chlorination agent and SiCl4 as defluorination agent. The chlorination rate of bastnaesite concentrate was relatively low at the temperature below 500 ℃. When the temperatttre was raised and the amount of defluorrination agent increased, the rare earth chloride yield increased. But with the carbochlorination going on, the influence of temperature became weak. In the temperatures range from 450 to 650℃, and in the presence of SiCI4, the rare earth chloride yield increased from 36% to 98%. The carbochlorination of bastnaesite concentrate could be carried on at a low temperature in the presence of SiCl4. The carbochlorination followed the shrinking sphere model, and the model was expressed as a mathematical formula of kt=1-（1-X）^1/3 and the apparent activation energy of the carbochlorination was 42.5 kJ/mol.

关 键 词：氟碳铈矿 碳热氯化 脱氟剂 动力学 

分 类 号：TF845[冶金工程—有色金属冶金]