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Qualitative, Quantitative and Mechanism Research of Volatiles in the Most Commonly Used CaO–SiO2–CaF2–Na2Ο Slag During Casting Process

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Abstract

The volatilization problem of mold fluxes extremely affects their physicochemical properties and then the quality of steel shells and casting process. Therefore, in this paper, the qualitative and quantitative analysis of volatiles in the most commonly used CaO–SiO2–CaF2–Na2O slag was conducted with thermogravimetric analyzer–mass spectroscopy (TG–MS), X-ray diffraction (XRD), scanning electron microscope with energy-dispersive spectroscopy (SEM–EDS) and FactSage, followed by giving the mechanism of fluorine volatiles in mold fluxes during the actual casting process. The results showed that the fluorine volatiles were formed when the temperature was higher than 1000 °C. The species of fluorine volatiles were SiF4 and NaF. Moreover, the total volatiles content of fluorine for sample B with Na2O was 9.41%, being much larger than that of 1.53% for sample C without Na2O. For sample B, the content of NaF was much larger than that of SiF4. It was because of the reaction between Na2O and CaF2. SiF4 with a low boiling point of − 65 °C could pass through the slag layer and enter air directly. However, when NaF passed through the sinter layer or powder slag layer, NaF would convert into liquid or solid state, reenter molten slag and continuously repeat this process due to their high melting point of 993 °C.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51574050).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Shaopeng Gu, Liang Yu, Guanghua Wen, Ping Tang & Zhe Wang

  2. Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing, 400044, China

    Liang Yu

  3. Chongqing Iron and Steel Co. Ltd, Chongqing, 400001, China

    Zhubing Gao

  4. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing, 400044, China

    Shaopeng Gu & Guanghua Wen

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  1. Shaopeng Gu
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  2. Liang Yu
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  3. Guanghua Wen
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  4. Ping Tang
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  5. Zhe Wang
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  6. Zhubing Gao
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Correspondence to Liang Yu.

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Gu, S., Yu, L., Wen, G. et al. Qualitative, Quantitative and Mechanism Research of Volatiles in the Most Commonly Used CaO–SiO2–CaF2–Na2Ο Slag During Casting Process. Trans Indian Inst Met 74, 775–782 (2021). https://doi.org/10.1007/s12666-021-02184-y

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  • DOI: https://doi.org/10.1007/s12666-021-02184-y

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