机械活化条件下超细铁矿粉氢基还原特性及机制  

Hydrogen reduction characteristics and mechanism of ultrafine iron ore powder under mechanical activation

作　　者：魏汝飞 孟东祥 龙红明 郭培民[3] 李凯[4,5] 刘文斌 WEI Rufeil;MENG Dongxiang;LONG Hongmingl;GUO Peimin;LI Kai;LIU Wenbin(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China;Key Laboratory of Metallurgical Emission Reduction and Resource Utilization,Ministry of Education,Anhui University of Technology,Ma'anshan 243002,Anhui,China;The State Key Laboratory for Advanced Iron and Steel Processes and Materials,Iron and Steel Research Institute,Beijing 100o81,China;Hebei Yuanda Zhongzheng Bio-Tech Co.,Ltd.,Shijiazhuang 050700,Hebei,China;Hebei Botai Environmental Protection Technology Co.,Ltd.,Tangshan 06361l,Hebei,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]冶金减排与资源利用教育部重点实验室(安徽工业大学),安徽马鞍山243002 [3]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081 [4]河北远大中正生物科技有限公司,河北石家庄050700 [5]河北博泰环保科技有限公司,河北唐山063611

出　　处：《钢铁研究学报》2022年第9期907-915,共9页Journal of Iron and Steel Research

摘　　要：通过热重法研究了不同机械活化程度的铁矿粉氢基还原特性,并分析和探讨了其还原反应机制。实验结果表明,机械活化对氢气还原铁矿粉有促进作用,机械活化时间越长,还原特征温度越低,还原反应所需的活化能也越低,但反应机制未发生变化,反应的限制性环节是其界面反应。机械活化明显影响到超细铁矿粉的逐级反应,对于未经活化的铁矿粉而言,逐级反应层次极不明显,而对于活化后铁矿粉的逐级反应层次随着活化时间的增加越发分明。The hydrogen-based reduction characteristics of iron ore powder with different degrees of mechanical activation were studied by thermogravimetry,and the reduction reaction mechanism was analyzed and discussed.The experimental results show that mechanical activation has a facilitating effect on the reduction of iron ore powder by hydrogen,and the longer the mechanical activation time,the lower the reduction characteristic temperature and the lower the activation energy required for the reduction reaction,but the reaction mechanism remains unchanged,and the restrictive step of the reaction is its interfacial reaction.Mechanical activation obviously affects the step-by-step reaction of ultrafine iron ore powder,for the unactivated iron ore powder,the step-by-step reaction level is extremely insignificant,while for the activated iron ore powder the step-by-step reaction level becomes more and more distinct with the increase of activation time.

关 键 词：机械活化 超细铁矿粉 氢还原 反应机制 限制性环节 

分 类 号：TF521[冶金工程—钢铁冶金]