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›› 2007, Vol. 7 ›› Issue (2): 298-301.

• 反应与分离 • 上一篇    下一篇

SiCl4作用下氟碳铈精矿的碳热氯化动力学

张丽清,王之昌,姜琳琳,王小欢,张风春   

  1. 沈阳化工学院应用化学学院
  • 出版日期:2007-04-20 发布日期:2007-04-20

Kinetic Study on Carbochlorination of Bastnaesite Concentrate in the Presence of SiCl4

ZHANG Li-qing,WANG Zhi-chang,JIANG Lin-lin,WANG Xiao-huan,ZHAGN Feng-chun   

  1. Applied Chemistry College Shenyang Institute of Chemical Technology
  • Online:2007-04-20 Published:2007-04-20

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被引次数

9

摘要： 以活性炭为还原剂、Cl2为氯化剂、SiCl4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SiCl4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.

关键词: 氟碳铈矿, 碳热氯化, 脱氟剂, 动力学

Abstract: A carbochlorination process of bastnaesite concentrate was investigated by using activated carbon powder as reductant, Cl2 as chlorination agent and SiC14 as defluorination agent. The chlorination rate of bastnaesite concentrate was relatively low at the temperature below 500℃. When the temperature 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 SiCl4, 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.

Key words: bastnaesite concentrate, carbochlorination, defluorination agent, kinetics