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Effect of MgO on the fluoride vaporization and crystallization of CaF2–CaO–Al2O3–(MgO) slag for vacuum electroslag remelting

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Abstract

The vaporization and crystallization of CaF2–CaO–Al2O3 slags with different MgO contents for electroslag remelting were investigated by various analytical methods. The results show that the main volatiles from investigated slag with 8.8 mass% MgO content at 1723 K are CaF2 and AlF3 and contain trace MgF2. The mass loss of CaF2–CaO–Al2O3–(MgO) slag decreases with the increase of MgO content. The addition of MgO within 8.8 mass% has little effect on the viscosity of investigated slag, implying that the viscosity change is not the reason to inhibit the fluoride vaporization. At 1723 K, the vapor pressures of CaF2 and AlF3 decrease with the increase of MgO content; thus, fluoride vaporization becomes weak. The fluoride vaporization of slag with MgO addition under vacuum at 1823 K is also inhibited. The MgO addition can decrease the crystallization temperature of 11CaO·7Al2O3·CaF2, but excessive MgO addition can lead to the precipitation of MgO.

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Acknowledgements

The authors gratefully acknowledge the support from the Project Funded by National Natural Science Foundation of China (Grant No. 52004189) and China Postdoctoral Science Foundation (Grant No. 2019M660188).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Tengfei Li, Guangqiang Li & Yu Liu

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Guangqiang Li

  3. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel Making, Wuhan University of Science and Technology, Wuhan, 430081, China

    Xijie Wang & Yufeng Tian

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Contributions

GL and YL conceived and designed the experiments; TL and XW performed the experiments; TL and YT analyzed the data; TL wrote the first draft of the manuscript; YL revised and approved the final version of the manuscript. YL and TL performed investigation; YL performed project administration and writing—review and editing; TL performed writing—original draft.

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Correspondence to Yu Liu.

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Li, T., Li, G., Liu, Y. et al. Effect of MgO on the fluoride vaporization and crystallization of CaF2–CaO–Al2O3–(MgO) slag for vacuum electroslag remelting. J Therm Anal Calorim 147, 11445–11455 (2022). https://doi.org/10.1007/s10973-022-11347-y

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