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Investigation on the structure, fluoride vaporization and crystallization behavior of CaF2–CaO–Al2O3–(SiO2) slag for electroslag remelting

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Abstract

The structure, vaporization behavior and crystallization of CaF2–CaO–Al2O3 slags with different SiO2 contents for electroslag remelting were investigated by employing the TG and DSC measurements in conjunction with the Raman spectroscopy measurement for linking the macroscopic physicochemical property and microstructure information. The results show that SiO2 addition makes the depolymerized aluminate units polymerized into fully polymerized Q4Al unit and Al–O–Al complex structural groups. With the SiO2 content increasing to 6.1 mass%, the vaporization rate of fluoride increases because the SiF4 possessing higher vapor pressure is formed and the SiO2 addition can promote the formation of AlF3. As SiO2 content is further increased to 8.6 mass%, the vaporization rate of fluoride decreases because the mass transfer becomes slower. The more complex slag structure resulted from SiO2 addition dramatically decreases the crystallization temperature of the primary crystalline phase and the size of crystalline particles in the solidified slag.

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Acknowledgements

The authors gratefully acknowledge the support from the Key Program of Joint Funds of the National Natural Science Foundation of China and the Government of Liaoning Province (Grant No. U1508214) and the National Natural Science Foundation of China (Grant No. 51210007).

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Authors and Affiliations

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

    Yu Liu & Guangqiang Li

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

    Yu Liu, Yong Wang, Guangqiang Li, Cheng Yuan & Ru Lu

  3. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Guangqiang Li

  4. School of Metallurgy, Northeastern University, Shenyang, 110004, China

    Baokuan Li

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  1. Yu Liu
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Correspondence to Guangqiang Li.

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Liu, Y., Wang, Y., Li, G. et al. Investigation on the structure, fluoride vaporization and crystallization behavior of CaF2–CaO–Al2O3–(SiO2) slag for electroslag remelting. J Therm Anal Calorim 139, 923–931 (2020). https://doi.org/10.1007/s10973-019-08518-9

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  • DOI: https://doi.org/10.1007/s10973-019-08518-9

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