流化床中铁矿粉预还原条件对终还原影响的实验研究  

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

作　　者：陈红生[1] 郑忠[1] 张宇涛[1] 邹胜伟[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《过程工程学报》2013年第6期980-985,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金项目(编号:51274264;51074201)

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.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.

关 键 词：铁矿粉 流化床 预还原 终还原 

分 类 号：TF552[冶金工程—钢铁冶金]