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›› 2010, Vol. 10 ›› Issue (1): 133-137.

• 过程与工艺 • 上一篇    下一篇

真空碳热还原氧化锌矿动力学

熊利芝 陈启元 尹周澜 张平民   

  1. 吉首大学化学化工学院 中南大学化学化工学院冶金及应用物理化学研究所 中南大学化学化工学院 中南大学化学化工学院
  • 收稿日期:2009-08-17 修回日期:2009-10-12 出版日期:2010-02-20 发布日期:2010-02-20
  • 通讯作者: 熊利芝

Vacuum Carbothermal Reduction Kinetics of Zinc Oxide Ore

XIONG Li-zhi CHEN Qi-yuan YIN Zhou-lan ZHANG Ping-min   

  1. .College of Chemistry and Chemical Engineering , Jishou University College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University Central South University
  • Received:2009-08-17 Revised:2009-10-12 Online:2010-02-20 Published:2010-02-20
  • Contact: XIONG Li-zhi

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摘要： 在真空条件下，对煤还原氧化锌矿的动力学进行了研究. 实验结果显示，增大C/Zn总摩尔比或提高反应温度，锌还原率增大；增大氧化锌矿的粒度或升高系统压强，锌还原率降低；在1073~1223 K范围内，碳气化和界面反应对氧化锌还原影响较小，Zn蒸汽和CO气体的扩散对氧化锌还原影响大，其活化能为177.72~191.31 kJ/mol，为整个还原过程的控制步骤.

关键词: 碳热还原, 氧化锌矿, 动力学, 锌

Abstract: The kinetics of vacuum carbothermal reduction of zinc oxide ore was investigated. Experimental results indicated that the reduction ratio of zinc was increased by increasing the molar ratio of C/Zntotal or the reaction temperature. Furthermore, it decreased with increase in either the size of zinc oxide ore or pressure of system. The results revealed that carbon gasification or interface reaction had a lesser effect, but the gas diffusion of Zn vapor and CO had a very important effect on the reduction reaction at 1073~1223 K. The gas diffusion was the rate-determining step of overall reduction process, in which activation energy was estimated to be 177.72~191.31 kJ/mol.

Key words: carbothermal reduction, zinc oxide ore, kinetics, zinc

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