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Dissolution of SiO2 Inclusions in CaO-SiO2-Based Slags In Situ Observed Using High-Temperature Confocal Scanning Laser Microscopy

  • Topical Collection: 2021 Metallurgical Processes Workshop for Young Scholars
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Abstract

In the current study, the dissolution mechanism of SiO2 inclusion particles in CaO-SiO2-based refining slags at 1793 K-1853 K was investigated using high-temperature confocal scanning laser microscopy. The rate-limiting step of the SiO2 inclusion dissolution in CaO-SiO2-based refining slags was the diffusion of SiO2 in CaO-SiO2-based slags when the boundary layer was formed. The main influence factor of the dissolution rate of SiO2 inclusions changed from the concentration gradient and the interface area to the interface area during the particle dissolution process. With the increase of the CaO/SiO2 ratio of slag from 0.5 to 1.25, the dissolution time of the inclusion obviously decreased, indicating that a higher CaO/SiO2 ratio of slag was beneficial to the removal of inclusions by the slag absorption. The dissolution rate of inclusions increased first and then decreased with higher Al2O3 content. The optimal Al2O3 content of CaO-SiO2-Al2O3-3 pct MgO slag was 5 pct to promote the inclusion removal. The higher experimental temperature promoted the dissolution of SiO2 inclusions in slags. A linear relationship between the dissolution rate of SiO2 particles (v) and a ratio of concentration difference and slag viscosity (ΔC/η) was fitted as v = 800.29 × ΔC/η. The dissolution rate of SiO2 inclusions in CaO-SiO2-Al2O3-3 pct MgO slags commonly used for the Si-Mn-killed steels was predicted.

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Acknowledgments

The authors are grateful for support from the National Nature Science Foundation of China (Grant Nos. U1860206, 51725402), the S&T Program of Hebei (Grant Nos. 20311004D, 20311005D, 20311006D, 20591001D), the High Steel Center (HSC) at Yanshan University, Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM) and the High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing (USTB), China, and Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) Fund.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), Beijing, 100083, P.R. China

    Ying Ren, Pei Zhu, Changyu Ren & Nan Liu

  2. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang, 110819, P.R. China

    Ying Ren

  3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao City, Hebei Province, 066004, P.R. China

    Lifeng Zhang

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  1. Ying Ren
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Manuscript submitted August 19, 2021; accepted November 19, 2021.

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Ren, Y., Zhu, P., Ren, C. et al. Dissolution of SiO2 Inclusions in CaO-SiO2-Based Slags In Situ Observed Using High-Temperature Confocal Scanning Laser Microscopy. Metall Mater Trans B 53, 682–692 (2022). https://doi.org/10.1007/s11663-021-02401-5

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  • DOI: https://doi.org/10.1007/s11663-021-02401-5

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