【摘要】 为明确Fe₂O₃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 FeTiO₃（1-x）Fe₂O₃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,FeTiO₃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Fe₂O₃能够促进FeTiO₃还原,且在还原过程中存在过渡相Fe₂TiO₄和Fe₃Ti₃O₁₀。固溶体-石墨交界面首先形成浮士体（FeO）、钛铁尖晶石（Fe₂TiO₄）和TiO₂,进一步还原生成金属Fe和Ti₂O₃。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。更多还原

【Abstract】 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.更多还原