白云鄂博铁精矿内配碳球团还原动力学研究  

Research on the reduction kinetics of Baiyunebo iron concentrate of carbon-containing pellets

作　　者：赵文广[1] 高强[1] 赵卫东[2] 王永斌[1] 彭军[1] 安胜利[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]包钢薄板坯连铸连轧厂,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2015年第2期112-117,共6页Journal of Inner Mongolia University of Science and Technology

基　　金：钢铁冶金新技术国家重点实验室开放基金(KF12-04);内蒙古自然科学基金(2013MS0718)

摘　　要：为降低CO2排放量,发展以H2为还原剂的炼铁生产方式势在必行.针对富氢气固还原工艺中存在着气体利用率低和还原供热不足等问题,利用热重法研究了温度、碳氧比、煤粉粒度对白云鄂博铁精矿含碳球团还原速度的影响.结果表明,在碳氧摩尔比为1.1时,还原温度越高,煤粉越小,含碳球团还原速度越大.基于碳气化反应、气相扩散和界面反应的含碳球团还原速度方程能较好地处理本研究的数据.在850℃下,由未反应核模型得出气体内扩散活化能和界面反应活化能分别为87.3 k J/mol和306 k J/mol,还原温度越高,扩散阻力越大,化学反应阻力越小.在950℃下,还原反应过程速度由气体内扩散控制.Hydrogen-enriched reduction in blast furnace is an innovative technology responding to the requests for further reduction of CO2 emission and sustainable development on a global scale. Based on the fact that the hydrogen-enriched gas-solid reduction process is low at the utilization rate of gas with insufficient supply of heat , the effect of temperature, carbon-oxygen ratio and coal fines size on the reduction rate of Baiyun obo iron concentrate of carbon-containing pellets was studied by using thermogravimetric analysis （TG） method. The result indicated that while carbon-oxygen ratio was 1.1, the reduction rate increased with increasing the temperature and decreasing the size of the coal fines. Four well-known kinetic equations can well represent most of the experimental data, thus allowing an accurate evaluation of the rate constants. The gas internal diffusion activity energy and interfacial reaction activity energy calculated with unreacted core model is 87.3 kJ/tool and 306 kJ/mol respectively. The greater is the reduction temperature, the higher is the internal diffusion resistance and the smaller is the chemical resistance. It was hence concluded that gas internal diffusion should be the rate controlling step for the reduction of carbon-containing pellets at 950℃.

关 键 词：白云鄂博铁精矿 含碳球团 还原动力学 活化能 

分 类 号：TF554[冶金工程—钢铁冶金]