温度对氢气还原氧化铁影响及电化学性能研究  

Effect of temperature on the reduction of iron oxide by hydrogen and electrochemical performance of reduction product

作　　者：辛秦[1] 王新东[1,2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学高效钢铁冶金国家重点实验室,北京100083

出　　处：《有色金属科学与工程》2015年第1期41-47,共7页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金项目(91010002;50874008);国家重点基础研究发展计划(973计划)项目(2013CB934002)

摘　　要：采用纯的氧化铁进行直接还原的实验研究,利用H2作为还原气体在高温管式炉中进行焙烧还原.结果表明,随着反应时间的增加,氧化铁块还原率相应的增大.反应温度的不同,氧化铁块还原速率及电导率也相应的不同.600~900℃下经过一定时间的氢还原,还原产物的还原速率随温度的增加而增加,均可达到95%以上.通过交流阻抗法对还原产物的电导率的测试,得到了还原产物的电导率随时间和还原度的变化曲线.随着温度及时间的不同,电导率也相应变化,电导率的不同,可间接反映还原过程中产生了导电性不同的物质.Direct reduction experiments of pure iron oxide has been investigated using hydrogen as reducing gas in high temperature tube furnace. The results show that with adding reaction time, iron oxide reductive ratio increases accordingly. The reduction ratio of iron oxide and conductivity of reductive product are different accordingly with different reduction temperatures. After hydrogen reduction at the temperature from 600 ℃ to 900 ℃, reduction ratio of reduction product, reaching above 95%, increases with the increasing of temperature. The curve of reduction product conductivity changing with time and reduction degree is obtained by testing reduction product＇s conductivity adopting ac impedance method. The conductivity of product varies accordingly to the different reduction temperature and time. The variation of conductivity indirectly reflects that products with different conductivity have been produced.

关 键 词：氧化铁还原 显微结构 还原速率 还原动力学 电导率 

分 类 号：TF533.1[冶金工程—钢铁冶金]