FeTiO_3-Fe_2O_3固溶体合成及其非等温碳热还原研究  

Synthesis and Non-isothermal Carbothermic Reduction of FeTiO_3-Fe_2O_3 Solid Solution Systems

作　　者：邢相栋[1,2] 刘依然 巨建涛[1,2] 刘漫博[1,2] 陈云飞 Xing Xiangdong;Liu Yiran;Ju Jiantao;Liu Manbo;Chen Yunfei(Xi＇an University of Architecture ＆ Technology,Xi＇an 710055,China;Research Center of Metallurgical Engineering and Technology of Shaanxi,Xi＇an 710055,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]陕西省冶金工程技术研究中心,陕西西安710055 [3]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2018年第9期2775-2781,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51604209)

摘　　要：为明确Fe_2O_3固溶对FeTiO3还原过程的影响机理,本实验基于粉末煅烧法合成x FeTiO_3(1-x)Fe_2O_3固溶体(0≤x≤1),研究了非等温碳热还原条件下固溶体的还原行为,并采用X射线衍射仪(XRD)和扫描电镜-能谱仪(SEM-EDS)对合成固溶体及还原产物进行表征。结果表明,实验合成固溶体质地均匀,纯度较高,且x越大,FeTiO_3晶格畸变程度越大。固溶体开始还原温度和还原速率(还原度α的增大速率)均随着x值的增加而增加。固溶Fe_2O_3能够促进FeTiO_3还原,且在还原过程中存在过渡相Fe_2TiO_4和Fe_3Ti_3O_(10)。固溶体-石墨交界面首先形成浮士体(FeO)、钛铁尖晶石(Fe_2TiO_4)和TiO_2,进一步还原生成金属Fe和Ti_2O_3。由非等温碳热还原过程动力学计算分析,得出表观活化能为295.54 kJ/mol。To explore the carbothermic reduction behaviors of the x FeTiO3·（1-x）Fe2O3 solid solutions with various x values,the solid solutions were artificially synthesized and then subjected to non-isothermal carbothermic reduction.The results show that the solid solutions are of uniform texture and high purity.Meanwhile,lattice distortion degree of FeTiO3 are increased with increasing the value of x,and the initial reduction temperature and reduction rate which is the increasing rate of reduction degree α are also improved.The reduction of FeTiO3 could be improved by Fe2O3 dissolving,and the Fe2TiO4 as well as Fe3Ti3O10 exist as the transition phase in the reduction process.FeO,Fe2TiO4 and TiO2 are firstly generated in the interface of solid-graphite,and then reduced to Fe and Ti2O3.It is concluded that the apparent activation energy is 295.54 kJ/mol from the calculation and analysis of the non-isothermal kinetics for the carbon thermal reduction process.

关 键 词：钛铁氧化物固溶体 物相转变 非等温还原 

分 类 号：TB332[一般工业技术—材料科学与工程]