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Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al2O3 ratios

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Abstract

To provide theoretical guidance for performance stability control of low-reactive mold fluxes, the effects of BaO and MgO on the structure and properties of aluminate slag with various CaO/Al2O3 (C/A) ratios were investigated using the Fourier transform infrared spectrometer, Raman spectroscope, hemispherical melting point instrument, rotational viscometer and X-ray diffractometer. The results indicated that with BaO and MgO addition, the structure polymerization was first weakened and then enhanced at C/A of 1.1, and the transition contents corresponded to 8 wt.% BaO and 2 wt.% MgO, respectively, while the structure polymerization decreased continuously at C/A of 1.3. Since the viscosity change was well consistent with the structure evolution, the polymerization degree played a more prominent role in the slag viscosity than superheat degree when the melting temperature difference was within 40 °C. The break temperature decreased initially and then increased with augment of BaO and MgO at C/A of 1.1, while it manifested a decrease trend with BaO addition, and it decreased obviously but then turned to increase with MgO increment at C/A of 1.3. The crystallization phase and crystallization ratio kept stable with BaO increment, while the crystallization ratio rose greatly with MgO promoting LiAlO2 precipitation at C/A of 1.1. The crystal types of all experimental slags were mainly Ca12Al14O33 and CaF2 at C/A of 1.3, and the precipitation of crystalline phase BaAl2O4 demonstrated a rising trend, while that of Ca12Al14O33 gradually declined with BaO augment.

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Acknowledgements

The authors would like to deeply appreciate the fund support from the Natural Science Foundation of Anhui Provincial Education Department (KJ2021A0358) and the National Natural Science Foundation of China (51804004).

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Authors and Affiliations

  1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243032, Anhui, China

    Yu-qi Kong, Ting Wu, Wen-zhi Xia, Wen Yang & Hai-chuan Wang

  2. Key Laboratory of Metallurgical Emission Reduction and Resource Recycling (Ministry of Education), Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Ting Wu & Hai-chuan Wang

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  1. Yu-qi Kong
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Correspondence to Ting Wu.

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Kong, Yq., Wu, T., Xia, Wz. et al. Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al2O3 ratios. J. Iron Steel Res. Int. 31, 204–214 (2024). https://doi.org/10.1007/s42243-023-01051-y

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