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Softening–Melting Behaviors of a MgO-SiO2-FeO Slag System on a Coke Bed

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Abstract

MgO is crucial for improving the softening–melting properties of pellets. By considering primary slags of magnesium pellets with high FeO and SiO2 and moderate MgO contents, the effect of MgO/SiO2 and FeO contents on the softening–melting behaviors of a MgO-SiO2-FeO slag system were studied. Relevant mechanisms were clarified using FactSage 7.0, XRD, and EPMA. By increasing the MgO/SiO2 ratio from 0.3 to 0.9, the softening and melting temperatures of the slag increased by approximately 30°C. As the FeO content increased from 5% to 20%, the softening and melting temperatures of the slag decreased from 1368°C to 1271°C and 1395°C to 1342°C, respectively. The MgO/SiO2 and FeO contents had little effect on the permeation temperature. Increasing the MgO/SiO2 ratio improved the softening and melting temperatures of slag; however, increasing the FeO content decreased these temperatures owing to the substitution effect of Mg2+ on Fe2+.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Number U1960205).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, People’s Republic of China

    Kaikai Bai, Haibin Zuo, Yajie Wang, Yanbiao Chen, Jingsong Wang & Qingguo Xue

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  1. Kaikai Bai
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  2. Haibin Zuo
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Correspondence to Haibin Zuo.

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Bai, K., Zuo, H., Wang, Y. et al. Softening–Melting Behaviors of a MgO-SiO2-FeO Slag System on a Coke Bed. JOM 74, 2019–2028 (2022). https://doi.org/10.1007/s11837-022-05167-6

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  • DOI: https://doi.org/10.1007/s11837-022-05167-6

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