氢含量对氧化亚铁粉体还原动力学的影响

材料与冶金学报, 2016, 15(2): 107-111. doi: 10.14186/j.cnki.1671-6620.2016.02.006

氢含量对氧化亚铁粉体还原动力学的影响

杨晓波 ^1, , 胡晓军 ^2, , 陈志远 ^3, , 周国治 ^4,

1.北京科技大学钢铁冶金新技术国家重点实验室,北京,100083

2.北京科技大学钢铁冶金新技术国家重点实验室,北京,100083

3.北京科技大学钢铁冶金新技术国家重点实验室,北京,100083

4.北京科技大学钢铁冶金新技术国家重点实验室,北京,100083

基金项目: 国家自然科学基金资助项目(50834007,51090384) 北京市优秀人才培养资助项目(2010D009006000001)

关键词：氢还原 , 动力学 , 氧化亚铁 , 结构演变 , 氢含量

Effect of hydrogen content on reduction kinetics of FeO powder

Keywords： hydrogen reduction , kinetics , FeO , structure evolution , hydrogen content

采用热重法获得了873～1173 K氧化亚铁在不同氢含量H2-Ar还原气中的等温还原动力学曲线,发现在973 ～1023 K温度范围,随着氢气含量(体积分数)的增加,反应达到的还原程度降低.结合产物的显微结构分析,在该温度范围,随着氢气含量(体积分数)增加,氧化亚铁还原的化学反应速率加快,新生成的铁相黏结加剧,阻碍反应气体的扩散,最终影响整个反应进程.同时发现,反应速率与氢含量不符合线性规律.

参考文献

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氢含量对氧化亚铁粉体还原动力学的影响

Effect of hydrogen content on reduction kinetics of FeO powder

参考文献