还原气氛对流态化还原铁矿粉黏结失流的影响  

Influence of reducing atmosphere on the sticking during reduction of iron ore fines in a fluidized bed

作　　者：邵剑华[1] 郭占成[1] 唐惠庆[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《北京科技大学学报》2013年第3期273-281,共9页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金委员会与上海宝钢集团公司联合基金重点资助项目(50834007)

摘　　要：采用热态可视流化床装置研究了973～1173 K不同气氛条件对流态化还原铁矿粉黏结失流的影响.研究发现,一定表观气速条件下温度和还原气氛组成对失流时铁矿粉的金属化率影响不大,而失流时颗粒微观形态受还原气种类和温度的影响较显著,但还原气体积分数对形态的影响较小.此外,流化时间随着还原气体积分数的增大而逐渐缩矩,并通过线性拟合得到了不同温度时二者间的数学关系式.The sticking during reduction of iron ore fines under different atmosphere conditions was studied by using a thermal state visible fluidized bed from 973 to 1173 K.It is found that when defluidization occurs the influences of temperature and reducing atmosphere on the metallization rate of iron ore fines are limited if the superficial gas velocity is constant.At the same time,the surface microstructure of particles when defluidization happens is strongly dependent on reducing gas types and reduction temperature,but it is less dependent on the volume fraction of reducing gas.In addition,with the volume fraction of reducing gas increasing,the fluidization time of iron ore fines gradually decreases,and the mathematical relationship between them was obtained by linear fitting at different temperatures.

关 键 词：流化床 铁矿石还原 流态化 气氛 

分 类 号：TF552[冶金工程—钢铁冶金]