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FeTiO3-Fe2O3固溶体合成及其碳热还原研究
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西安建筑科技大学冶金工程学院,西安建筑科技大学冶金工程学院,西安建筑科技大学冶金工程学院,西安建筑科技大学冶金工程学院,西安建筑科技大学冶金工程学院

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国家自然科学基金资助(项目号51604209)


Synthesis and non-isothermal carbothermic reduction of FeTiO3-Fe2O3 solid solution systems
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College of Metallurgical Engineering,Xi’an University of Architecture Technology,Xi’an Shaanxi,College of Metallurgical Engineering,Xi’an University of Architecture Technology,Xi’an Shaanxi,College of Metallurgical Engineering,Xi’an University of Architecture Technology,Xi’an Shaanxi,College of Metallurgical Engineering,Xi’an University of Architecture Technology,Xi’an Shaanxi,College of Metallurgical Engineering,Xi’an University of Architecture Technology,Xi’an Shaanxi

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The National Science Fund for Distinguished Young Scholars

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    摘要:

    为明确Fe2O3固溶对FeTiO3还原过程的影响机理,本文基于粉末煅烧法合成(1-x)FeTiO3?xFe2O3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。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。

    Abstract:

    To exam the carbothermic reduction behaviors of the (1-x)FeTiO3?xFe2O3 solid solutions with various x value, the solid solutions were artificially synthesized successfully and then subjected to non-isothermal carbothermic reduction. The results show that the solid solutions synthesized in laboratory were uniform texture and high purity. Meanwhile, lattice distortion degree of FeTiO3 was greater with increasing the value of x, and the initial reduction temperature and reduction rate which is the increasing rate of reduction degree α were also improved. The reduction could be improved for FeTiO3 as Fe2O3 dissolving, and the Fe2TiO4 as well as Fe3Ti3O10 were existed as the transition phase in the reduction process. FeO, Fe2TiO4 and TiO2 were firstly generated in the interface of solid - graphite, and then reduced to Fe and Ti2O3. It is concluded that the apparent activation energy of 295.54 kJ/mol from the calculation and analysis of the non-isothermal kinetics for the carbon thermal reduction process.

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邢相栋,刘依然,巨建涛,刘漫博,陈云飞. FeTiO3-Fe2O3固溶体合成及其碳热还原研究[J].稀有金属材料与工程,2018,47(9):2775~2781.[Xiang-dong Xing, Yi-ran Liu, Jian-tao Ju, Man-bo Liu, Yun-fei Chen. Synthesis and non-isothermal carbothermic reduction of FeTiO3-Fe2O3 solid solution systems[J]. Rare Metal Materials and Engineering,2018,47(9):2775~2781.]
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  • 收稿日期:2016-10-18
  • 最后修改日期:2017-04-13
  • 录用日期:2017-05-15
  • 在线发布日期: 2018-11-01
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