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Phase Transitions and Atomic-Scale Migration During the Preoxidation of a Titania/Ferrous Oxide Solution

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Abstract

The non-isothermal preoxidation of the titania/ferrous oxide solution (TFOS) was investigated between 300°C and 1200°C. To explore the TFOS preoxidation mechanism, the phase transitions, crystal structure behavior, subreactions, and atomic-scale migration and enrichment of the TFOS during preoxidation were studied. Two different titanium and iron solutions were distinguished by scanning electron microscopy analysis. The phase transitions from titanomagnetite (TTM) to titanohematite to pseudobrookite (PSB) were indicated by the separation and enrichment of Ti and Fe, which migrated into PSB and hematite, respectively. This occurred alongside the generation and destruction of FeTiO3. Multiple local maxima and shoulders were observed in the double-derivative thermogravimetric curves during the preoxidation process, indicating the existence and initial reaction temperatures of five stages of subreactions. Compared with the theoretical mass gain (3.28 wt.%), only 80.8 at.% of the Fe2+ was oxidized to Fe3+, leaving unoxidized TTM in the solid solution during non-isothermal oxidation at 1200°C. The concentration of Ti gradually increased in the lamellar structures. However, Fe, Al, and O were mostly restricted to the homogeneous regions. The segregation of Mg only became obvious when TFOS was oxidized at high temperatures. The enrichment reduced the impact of Ti when O migrated during the reduction process, thus, enhancing the reducibility of the TFOS after preoxidation.

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Acknowledgement

This work was financially supported by the National Key Basic Research and Development Program of China (Grant No. 2011BAC01B02).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Zhen-Yang Wang, Jian-Liang Zhang, Zheng-Jian Liu, Ya-Peng Zhang, Xing-Le Liu & Yi-Ran Liu

  2. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, People’s Republic of China

    Xiang-Dong Xing

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  1. Zhen-Yang Wang
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Correspondence to Zhen-Yang Wang or Jian-Liang Zhang.

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Wang, ZY., Zhang, JL., Xing, XD. et al. Phase Transitions and Atomic-Scale Migration During the Preoxidation of a Titania/Ferrous Oxide Solution. JOM 68, 656–667 (2016). https://doi.org/10.1007/s11837-015-1678-z

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  • DOI: https://doi.org/10.1007/s11837-015-1678-z

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