【作者】 戴云朵； 郭兴敏； 张家芸；

【Author】 Dai Yunduo, Guo Xingmin, Zhang Jiayun (University of Science and Technology Beijing Metallurgical and Ecological Engineering School, Beijing 100083, China)

【机构】 北京科技大学冶金与生态工程学院；

【摘要】 纯Fe2O3试样和MgO掺入量为2．5,3．0,3．5和5．0％wt的Fe2O3试样在1173K,CO-CO2混合气体中等温还原,X射线衍射分析表明相应于不同MgO含量,浮氏体的衍射峰发生偏移,FeO的晶面间距随MgO含量的增加减小。对固溶了MgO的浮氏体进行了不同温度的等温热重还原实验,结果表明MgO固溶量的增加降低了浮氏体的还原速度。MgO在浮氏体中的固溶量增加使得浮氏体的晶面间距缩小,而晶面间距的减小使得阳离子的移动变得困难,从而降低了还原反应的速度。更多还原

【Abstract】 Fired compacts of hematite doped with different proportion of MgO (mass fractions were 2.5%, 3.0%, 3.5%, 4.0%, 5.0 %) were isothermally reduced to wtlstite in CO-CO2 gas mixture at 1173K. It is found that the lattice parameters of wtlstite decreases with MgO content dissolved in wtlstite crystal from the results of X-ray diffraction. The pure wtlstite and wtlstite doped with MgO were reduced at different temperatures. The results show that the reductions are restricted with the increasing MgO content. The more the content of MgO dissolved in wtlstite crystal was, the smaller the lattice parameter and the interplanar distances of wtlstite became. This shrinkage was not helpful to the migration of Fe ions and restricted the reduction.更多还原