Effect of Fe2O3 on the size and components of spinel crystals in the CaO-SiO2-MgO-Al2O3-Cr2O3 system

Qi-qiang Mou; Jian-li Li; Qiang Zeng; Hang-yu Zhu

doi:10.1007/s12613-019-1822-9

Volume 26 Issue 9

Sep. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(9): 1113-1119

Qi-qiang Mou, Jian-li Li, Qiang Zeng, and Hang-yu Zhu, Effect of Fe₂O₃ on the size and components of spinel crystals in the CaO-SiO₂-MgO-Al₂O₃-Cr₂O₃ system, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1113-1119. https://doi.org/10.1007/s12613-019-1822-9

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Qi-qiang Mou, Jian-li Li, Qiang Zeng, and Hang-yu Zhu, Effect of Fe2O3 on the size and components of spinel crystals in the CaO-SiO2-MgO-Al2O3-Cr2O3 system, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1113-1119. https://doi.org/10.1007/s12613-019-1822-9

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Research Article

Effect of Fe₂O₃ on the size and components of spinel crystals in the CaO-SiO₂-MgO-Al₂O₃-Cr₂O₃ system

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Corresponding author:
Jian-li Li E-mail: jli@wust.edu.cn
Received: 5 November 2018; Revised: 15 March 2019; Accepted: 29 March 2019

Abstract

Abstract

size of spinel crystals in the CaO-SiO₂-MgO-Al₂O₃-Cr₂O₃ system was investigated using lab experiments carried out in a carbon tube furnace. Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD) were used to analyze the microstructure, components, and the mineral phases of synthetic slags. FactSage 7.1 was used to calculate the crystallization process of the molten slag. The results showed that the addition of Fe₂O₃ promoted the precipitation of spinel crystals and inhibited the formation of dicalcium silicate. The size of spinel crystals increased from 2.74 to 8.10 μm and the contents of chromium and iron in the spinel varied as the Fe₂O₃ addition was increased from 0 to 20wt%. Fe₂O₃ thermodynamically provided the spinel-forming components to enhance the formation of FeCr₂O₄, MgFe₂O₄, and Fe₃O₄. The addition of Fe₂O₃ increased the fraction of liquid phase in a certain temperature range and promoted diffusion by decreasing the slag's viscosity. Therefore, Fe₂O₃ is beneficial to the growth of spinel crystals in stainless steel slag.
- ferric oxide;
- stainless steel slag;
- spinel;
- crystal size;
- chromic oxide

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