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Effect of Al2O3 and MgO on crystallization and structure of CaO–SiO2–B2O3-based fluorine-free mold flux

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Abstract

The crystallization behavior and melt structure of the CaO–SiO2–B2O3-based fluorine-free mold flux were investigated. The results show that the crystallization of the mold flux was first inhibited and then promoted with the increase in Al2O3 content from 4 to 12 wt.%. However, it was enhanced by MgO in the range of 2–10 wt.%. The results of Fourier transform infrared spectroscopy and Raman spectroscopy showed that Al2O3 worked as a network former in the mold flux melt when its content was in the range of 4–8 wt.%, whereas it worked as the network breaker to provide O2− when its content was in the range of 8–12 wt.%. In addition, the combined effects from the charge compensation by Mg2+ and the network broken by O2− led to the increase in some typical T–O–T (Al–O–Al, B–O–B, etc.) and simpler structural units (Q0(Si), B–O− in the [BO2O−], etc.) when the MgO content was in the range of 2–6 wt.%. The continuous increase in O2− provided by the addition of MgO from 6 to 10 wt.% further depolymerized the network of the melt and finally caused fast crystallization.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51874363, U1760202), Natural Science Foundation of Hunan Province (2019JJ40345) and Hunan Scientific Technology Projects (2018RS3022, 2018WK2051).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan, China

    Jun-yu Chen, Wan-lin Wang, Le-jun Zhou & Zi-hang Pan

  2. National Center for International Cooperation of Clean Metallurgy, Changsha, 410083, Hunan, China

    Jun-yu Chen, Wan-lin Wang, Le-jun Zhou & Zi-hang Pan

Authors
  1. Jun-yu Chen
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  2. Wan-lin Wang
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  4. Zi-hang Pan
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Correspondence to Le-jun Zhou.

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Chen, Jy., Wang, Wl., Zhou, Lj. et al. Effect of Al2O3 and MgO on crystallization and structure of CaO–SiO2–B2O3-based fluorine-free mold flux. J. Iron Steel Res. Int. 28, 552–562 (2021). https://doi.org/10.1007/s42243-020-00439-4

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  • DOI: https://doi.org/10.1007/s42243-020-00439-4

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