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| High-performance chromite by structure stabilization treatment |
| En-hui Wang1, Chang Luo1, Jun-hong Chen2, Xin-mei Hou1 |
| 1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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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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En-hui Wang,Chang Luo,Jun-hong Chen, et al. High-performance chromite by structure stabilization treatment[J]. Journal of Iron and Steel Research International, 2020, 27(2): 169-179.
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2020, Vol. 27 
