东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (4): 517-521.DOI: 10.12068/j.issn.1005-3026.2017.04.013

• 材料与冶金 • 上一篇    下一篇

红格钒钛磁铁矿氧化物相转变及非等温氧化动力学

李尉, 付贵勤, 储满生, 朱苗勇   

  1. (东北大学 冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2016-02-02 修回日期:2016-02-02 出版日期:2017-04-15 发布日期:2017-04-11
  • 通讯作者: 李尉
  • 作者简介:李尉(1990-),男,江苏徐州人,东北大学博士研究生; 储满生(1973-),男,安徽岳西人,东北大学教授,博士生导师; 朱苗勇(1965-),男,浙江诸暨人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51574067).

Phase Transformation and Non-isothermal Oxidation Kinetics of Hongge Vanadium-Bearing Titanomagnetite

LI Wei, FU Gui-qin, CHU Man-sheng, ZHU Miao-yong   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2016-02-02 Revised:2016-02-02 Online:2017-04-15 Published:2017-04-11
  • Contact: ZHU Miao-yong
  • About author:-
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摘要: 在对红格钒钛磁铁矿基础特性研究基础上,探讨了其球团氧化过程物相的存在形式和转变过程,并通过热分析法研究了红格矿非等温氧化动力学.结果表明:红格钒钛磁铁矿属于高铬型钒钛磁铁矿,Cr2O3的质量分数为1.48%,连晶强度为625 N;主要物相组成为磁铁矿、钛磁铁矿、钒磁铁矿、铬铁矿;温度低于300℃时其氧化速率缓慢;球团氧化过程有价组元物相迁移变化历程为:Fe3O4→Fe2O3;Fe2VO4→(Cr0.15V0.85)2O3;Fe2.75Ti0.25O4→FeTiO3→Fe9TiO15;FeCr2O4→(Fe0.6Cr0.4)2O4,Fe0.7Cr1.3O3,(Cr0.15V0.85)2O3.红格矿非等温氧化动力学研究表明:当升温速率为10 ℃/min时,温度在220~380℃,380~500℃和500~800℃时,反应活化能分别为47.02,14.95和30.36kJ·mol-1.

关键词: 红格钒钛磁铁矿, 基础特性, 氧化, 物相转变, 非等温动力学

Abstract: The existence form and phase transformation of Hongge vanadium-bearing titanomagnetite (HVTM) pellets during oxidation process were investigated based on the study of fundamental characteristics of the ore. The non-isothermal oxidation kinetics of HVTM was also studied by the thermogravimetry. The results indicated that the HVTM is high chromium vanadium-bearing titanomagnetite with 1.48wt% Cr2O3 and its crystal stock strength is 625 N, the ore mainly consists of magnetite, titanomagnetite, coulsonite and chromite. The HVTM oxidizes slowly below 300℃. Phase transformation behavior of valuable elements is as follows: Fe3O4→Fe2O3, Fe2VO4→(Cr0.15V0.85)2O3, Fe2.75Ti0.25O4→FeTiO3→Fe9TiO15, FeCr2O4→(Fe0.6Cr0.4)2O4, Fe0.7Cr1.3O3 and (Cr0.15V0.85)2O3.The results of non-isothermal oxidation kinetics of HVTM showed that when the HVTM oxidized at 220~380℃, 380~500℃ and 500~800℃ with a heating rate of 10℃·min-1, the activation energy are 47.02, 14.95 and 30.36kJ·mol-1, respectively.

Key words: Hongge vanadium-bearing titanomagnetite, fundamental characteristics, oxidation, phase transformation, non-isothermal kinetics

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