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High-performance chromite by structure stabilization treatment

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Abstract

Chromite is an important raw material applied in refractories. Efforts have been made to obtain high-performance chromite by adding MgO and Al2O3 from the viewpoint of structure optimization. In order to explore the effect of Al2O3 and MgO on the structure, two formulas, i.e., Mg-rich and Al-rich ones, were selected. The phase and microstructure development of samples heated in the temperature range of 1200–1600 °C were studied by X-ray diffraction and scanning electron microscopy with energy-dispersive spectrometry. MgO and Al2O3 added have diffused into chromite successfully by heat treatment. MgO diffuses into chromite, occupying the tetrahedral vacancies caused by the diffusion and oxidation of Fe2+ ions to stabilize the structure. Al2O3 diffuses into the surface layer of chromite, forming spinel-sesquioxide structure. Al-rich sample which has spinel-sesquioxide structure shows better corrosion resistance toward fayalite slag than Mg-rich sample which has single spinel structure by blocking the interdiffusion between Fe2+ ions in fayalite slag and Mg2+ ions in chromite.

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Acknowledgements

The authors express their appreciations to the National Natural Science Foundation for Excellent Young Scholars of China (No. 51522402), the National Natural Science Foundation of China (Nos. 51904021 and 51974021) and Fundamental Research Funds for the Central Universities (No. FRF-TP-19-008A1) for financial support.

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Author notes

  1. En-hui Wang and Chang Luo have contributed equally to this work.

Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    En-hui Wang, Chang Luo & Xin-mei Hou

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jun-hong Chen

Authors
  1. En-hui Wang
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  2. Chang Luo
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  3. Jun-hong Chen
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  4. Xin-mei Hou
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Correspondence to Xin-mei Hou.

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Wang, Eh., Luo, C., Chen, Jh. et al. High-performance chromite by structure stabilization treatment. J. Iron Steel Res. Int. 27, 169–179 (2020). https://doi.org/10.1007/s42243-019-00354-3

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  • DOI: https://doi.org/10.1007/s42243-019-00354-3

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