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›› 2010, Vol. 10 ›› Issue (6): 1119-1125.

• 过程与工艺 • 上一篇    下一篇

金属热还原法制备低氧高钛铁的基础研究

豆志河 张廷安 张含博 张志琦 牛丽萍 赫冀成   

  1. 东北大学 材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料电磁过程研究教育部重点实验室
  • 收稿日期:2011-01-11 修回日期:1900-01-01 出版日期:2010-12-20 发布日期:2010-12-20
  • 通讯作者: 豆志河

Basic Research on Preparation of High Titanium Ferroalloy with Low Oxygen Content by Thermit Reduction

DOU Zhi-he ZHANG Ting-an ZHANG Han-bo ZHANG Zhi-qi NIU Li-ping HE Ji-cheng   

  1. Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education), Northeastern University School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University
  • Received:2011-01-11 Revised:1900-01-01 Online:2010-12-20 Published:2010-12-20
  • Contact: DOU Zhi-he

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被引次数

23

摘要： 以金红石、钛精矿、Al(或铝镁合金)为原料采用热还原法制备出高钛铁合金. 计算了不同反应体系的绝热温度以及与TiO2-Al，TiO2-Mg体系相关反应的吉布斯自由能变，采用DTA研究了不同体系的反应动力学，采用XRD等对高钛铁合金进行了表征. 结果表明，所有反应体系的绝热温度均大于1800 K，反应能自发进行；采用Al-Mg合金复合还原剂能保证TiO2的有效还原，降低合金中的氧含量以及夹杂物含量；Al还原TiO2反应的表观活化能为164.497 kJ/mol，反应级数为0.414，Mg还原TiO2的表观活化能为383.235 kJ/mol，反应级数为0.591；高钛铁由Al2O3、TiO2、Ti2O、Fe2TiO4 、Ti9Fe3(Ti0.7Fe0.3)O3等复杂相组成，合金中氧含量高达12.20%.

关键词: 高钛铁, 热还原, 绝热温度, 电子探针

Abstract: Rutile, ilmenite and Al powder (or Al-Mg alloy) were used to prepare high titanium ferroalloy. The adiabatic temperatures of different reaction systems and the Gibbs free energy changes of relative reactions on TiO2-Al system and TiO2-Mg systems were calculated. The reaction kinetics of the systems was studied by DTA. The high titanium ferroalloy was characterized by XRD, SEM and electron microprobe. The results indicate that the adiabatic temperatures of all reaction systems are higher than 1800 K so all the reactions can be kept spontaneously. The content of oxygen and inclusions in the alloy can be controlled to lower level when Al-Mg alloy is used to reduce TiO2. The apparent activation energy is 164.497 kJ/mol and reaction order 0.414 when Al reduces TiO2. The apparent activation energy is 383.235 kJ/mol and reaction order 0.591 when Mg reduces TiO2. The high titanium ferroalloy consists of Al2O3, TiO2, Ti2O, Fe2TiO4, and Ti9Fe3 (Ti0.7Fe0.3)O3 complex phases. The oxygen content in the ferroalloy is up to 12.20%.

Key words: high titanium ferroalloy, thermit reduction, adiabatic temperature, electron microprobe