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›› 2013, Vol. 13 ›› Issue (6): 980-985.

• 过程与工艺 • 上一篇    下一篇

流化床中铁矿粉预还原条件对终还原影响的实验研究

陈红生 郑忠 张宇涛 邹胜伟   

  1. 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院
  • 收稿日期:2013-10-15 修回日期:2013-11-21 出版日期:2013-12-20 发布日期:2013-12-20
  • 通讯作者: 郑忠

Experimental Study on the Effects of Iron Ore Powder Pre-reduction Conditions on Final Reduction in a Fluidized Bed

CHEN Hong-sheng ZHENG Zhong ZHANG Yu-tao ZOU Sheng-wei   

  1. College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University
  • Received:2013-10-15 Revised:2013-11-21 Online:2013-12-20 Published:2013-12-20
  • Contact: ZHENG Zhong

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摘要： 在石英流化床中研究了铁矿粉的预还原和终还原行为，考察了预还原温度和时间对终还原过程的影响，通过对预还原和终还原产物表面形貌的观察，分析了预还原条件对铁矿粉终还原的影响规律. 结果表明，温度对还原速率和产物层结构有重要影响，预还原度随还原温度提高而增加，但终还原度有波动，较理想的预还原温度为973 K，终还原度可达80.4%. 在一定条件下缩短预还原时间不利于铁矿粉预还原，但有利于终还原.

关键词: 铁矿粉, 流化床, 预还原, 终还原

Abstract: Behavior of pre-reduction and final reduction of iron ore powder was investigated in a quartz fluidized bed reactor, and the effects of temperature and residence time of pre-reduction on the final reduction process were analyzed. Surface morphological properties of pre-reduction and final reduction products were observed and the effects of pre-reduction conditions on the final reduction were analyzed. The results indicate that temperature significantly influences the reduction rate and product structure. Pre-reduction degree increases with pre-reduction temperature, while there is some fluctuation in final reduction degree. Under the optimal pre-reduction temperature of 973 K, the final reduction degree is up to 80.4%. In addition, decrease of pre-reduction time is partly in favor of increase of the final reduction degree, but not for pre-reduction under certain conditions.

Key words: iron ore powder, fluidized bed, pre-reduction, final reduction

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