2O3固溶對FeTiO3還原過程的影響機(jī)理,本文基于粉末煅燒法合成(1-x)FeTiO3?xFe2O3固溶體(0≤x≤1),研究了非等溫碳熱還原條件下固溶體的還原行為,并采用X射線衍射儀(XRD)和掃描電鏡-能譜儀(SEM-EDS)對合成固溶體及還原產(chǎn)物進(jìn)行表征。結(jié)果表明,實驗合成固溶體質(zhì)地均勻,純度較高,且x越大,FeTiO3晶格畸變程度越大。固溶體開始還原溫度和還原速率(還原度α的增大速率)均隨著x值的增加而增加。固溶Fe2O3能夠促進(jìn)FeTiO3還原,且在還原過程中存在過渡相Fe2TiO4和Fe3Ti3O10。固溶體-石墨交界面首先形成浮士體(FeO)、鈦鐵尖晶石(Fe2TiO4)和TiO2,進(jìn)一步還原生成金屬Fe和Ti2O3。非等溫碳熱還原過程動力學(xué)計算分析,得出表觀活化能為295.54 kJ/mol。"/>

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FeTiO3-Fe2O3固溶體合成及其碳熱還原研究
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西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院

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國家自然科學(xué)基金資助(項目號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:

    為明確Fe2O3固溶對FeTiO3還原過程的影響機(jī)理,本文基于粉末煅燒法合成(1-x)FeTiO3?xFe2O3固溶體(0≤x≤1),研究了非等溫碳熱還原條件下固溶體的還原行為,并采用X射線衍射儀(XRD)和掃描電鏡-能譜儀(SEM-EDS)對合成固溶體及還原產(chǎn)物進(jìn)行表征。結(jié)果表明,實驗合成固溶體質(zhì)地均勻,純度較高,且x越大,FeTiO3晶格畸變程度越大。固溶體開始還原溫度和還原速率(還原度α的增大速率)均隨著x值的增加而增加。固溶Fe2O3能夠促進(jìn)FeTiO3還原,且在還原過程中存在過渡相Fe2TiO4和Fe3Ti3O10。固溶體-石墨交界面首先形成浮士體(FeO)、鈦鐵尖晶石(Fe2TiO4)和TiO2,進(jìn)一步還原生成金屬Fe和Ti2O3。非等溫碳熱還原過程動力學(xué)計算分析,得出表觀活化能為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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邢相棟,劉依然,巨建濤,劉漫博,陳云飛. FeTiO3-Fe2O3固溶體合成及其碳熱還原研究[J].稀有金屬材料與工程,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
  • 錄用日期:2017-05-15
  • 在線發(fā)布日期: 2018-11-01
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