Fe-Ni-O体系中Fe/Ni的还原行为  

Reduction behavior of Fe/Ni in the Fe-Ni-O system

作　　者：魏文洁[1] 张延玲[1] 魏芬绒[1] 杨小刚[1] 胡晓军[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288-296,共9页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51074025);中央高校基本科研业务费资助项目(FRF-SD-12-009A)

摘　　要：取电阻炉实验和热重分析等手段,探讨了Fe-Ni-O体系中不同条件下的产物组成及Fe/Ni的还原行为.结果表明:五种样品的还原难度由低到高依次为NiO<Fe_2O_3+Ni<Fe_2O_3+NiO<NiFe_2O_4<Fe_2O_3;Ni元素能够促进铁氧化物还原,其促进作用由Ni元素的初始状态决定,单质Ni>氧化物NiO>NiFe_2O_4中的Ni;NiFe_2O_4的还原过程中各产物由低温到高温依次出现的次序为Fe_3O_4、Ni、(Fe,Ni)、Fe和Fe_(0.64)Ni_(0.36).根据实验结果,对五种氧化物体系的还原过程进行了探讨,并获得了活化能、控速环节等重要参数及相关反应机理.The product composition under different conditions and the reduction behavior of Fe and Ni in the Fe-Ni-0 system were studied by electric resistance furnace experiments and thermogravimetric analysis.The order of difficult degree for reducing Fe/Ni oxides in five systems is NiOFe2O3＋NiFe2O3＋NiONiFe2O4Fe2O3.The existence of Ni can promote the reduction of iron oxides,while the contribution degree depends on its initial state,and the order tends to be metallic NiNiONi released from NiFe_2O_4.As the temperature increases,the reduction products of NiFe_2O_4 are in order of Fe_3O_4,Ni,（Fe,Ni）,Fe,and Fe0.64Ni0.36.Based on these experimental results,the reduction processes and the kinetics such as activation energy and rate-controlling step for reducing the five oxides were analyzed and discussed.

关 键 词：不锈钢 粉尘 还原 动力学 活化能 

分 类 号：TF533[冶金工程—钢铁冶金]