铁矿微粉低温输送预还原及附碳行为  

Pre-reduction of Fine Iron Ore with Moving Bed at Low Temperatures and Behavior of Carbon Deposition

作　　者：任东霞[1] 李秋菊[1] 王道净[1] 洪新[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《过程工程学报》2009年第5期922-926,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50474081;50634040)

摘　　要：研究了铁矿微粉低温输送预还原中气固比、还原时间、炉温、矿粉粒径、还原剂种类等参数对矿粉还原率的影响,并运用正交设计和模式识别方法对工艺参数进行了优化,对预还原过程中样品的附碳行为进行了探讨.结果表明,在矿粉粒径14～20μm、炉温660～700℃、反应时间180～220s、还原气成分CO0～20%()的优化条件下,预还原率较高,最高达70.16%.XRD分析表明,还原样品发生碳吸附现象,少量氢气可提高碳吸附率.Pre-reduction of fine iron ore at low temperatures was studied with single factor and orthogonal experiments. The effects of ratio of gas to solid, reaction time, temperature of furnace, particle size and kind of reducing agent on the reduction degree of fine iron ore were examined respectively. The process parameters were optimized and the behavior of carbon deposition was also discussed. The experimental result showed that the particle size of 14-20 μm, temperature of furnace in the range 660-700 ℃, reaction time between 180-220 s, and kind of reducing agent CO 0-20%（φ） were the optimal conditions, and the maximal reduction degree of 70.16% was achieved. In addition, the XRD and chemical analysis of reduction product indicated that the carbon deposition occurred during the reduction process. The presence of hydrogen could accelerate the carbon deposition rate.

关 键 词：铁矿微粉 低温还原 H2-CO混合气体 附碳 

分 类 号：TF552[冶金工程—钢铁冶金]