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Effect of CaCl2 Addition on the Melting Behaviors of CaO-SiO2-FeOx Steelmaking Slag System

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Abstract

The melting behavior of BOF slag (CaO-SiO2-FeOx) is one of the key factors for dephosphorization during the converter process. Laboratory experiments using mixed chemical reagents and pre-melted slags were carried out to study the effect of the slag compositions on its hemispheric melting point, and the phases in the slag system were observed at high temperatures. The results reveal that only a small amount of CaCl2 can decrease the hemispheric melting points of low basicity slags (w(CaO)/w(SiO2) ≤ 1.0); while an excessive amount of CaCl2 will increase the hemispheric melting point of the slag system. In the case of higher basicity slag (w(CaO)/w(SiO2) ≥ 1.5), the addition of CaCl2 will increase the ratio of solid phase in slag, which results in the rise of hemispheric melting point. Even though, the positive effect of CaCl2 on the dissolution of CaO is still obvious, higher slag basicity generally leads to a higher hemispheric melting point of the CaCl2-added slags except for a few cases, and the content of FeOx has an evident impact on the hemispheric melting point of this slag system. A certain amount of FeOx in BOF slag is very necessary.

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Adapted from Ref. [30] (Color figure online)

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Acknowledgments

The Natural Science Foundation of China (51804068, 52074073) and the Fundamental Research Funds for the Central Universities (N182504016) as well as Liaoning Revitalization Talents Program (XLYC1802032) are acknowledged for the financial support of the present study.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Ziwen Yan, Zhiyin Deng & Miaoyong Zhu

  2. School of Metallurgy, Northeastern University, Shenyang, China

    Ziwen Yan, Zhiyin Deng & Miaoyong Zhu

  3. Steelmaking Plant, Delong Iron & Steel Co., Ltd., Xingtai, Hebei, 054009, China

    Liqiao Huo

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  1. Ziwen Yan
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  2. Zhiyin Deng
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Correspondence to Zhiyin Deng.

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Manuscript submitted August 26, 2020; accepted January 14, 2021.

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Yan, Z., Deng, Z., Zhu, M. et al. Effect of CaCl2 Addition on the Melting Behaviors of CaO-SiO2-FeOx Steelmaking Slag System. Metall Mater Trans B 52, 1142–1153 (2021). https://doi.org/10.1007/s11663-021-02088-8

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