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Degradation Behavior of MgO Refractory by BOF Slags Containing Calcium Chloride

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Abstract

In order to clarify the degradation behavior of MgO refractory by BOF slags containing CaCl2, some laboratory experiments were carried out at steelmaking temperature to simulate the interaction between the refractory and slags. Three slag systems (viz. CaCl2-free, CaCl2-added and CaF2-added slags) were considered in this study. It is found that a solid solution magnesiowustite (MW) layer can be observed at the boundary between the refractory and the slags, and its thickness increases with time. In the MW layer, MgO diffuses to the slag, while FeO diffuses oppositely to the refractory. The dissolution of MgO refractory into the CaCl2-added slags reduces the solubility of CaCl2 in the slags, and causes a CaCl2 layer precipitated near the MW layer. The CaCl2 layer acts as a barrier to hinder the diffusion of MgO and FeO, thus leading to a thinner MW layer and a lower MgO content in the slags in contrast to the CaCl2-free slag. In the case of the CaF2-added slag, the thickest MW layer and the highest MgO content are obtained. So, the addition of CaCl2 into BOF slag would weaken the degradation of MgO refractory, while the addition of CaF2 plays an opposite role.

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Acknowledgments

The authors are thankful for the financial support of The National Natural Science Foundation of China (Grant Nos. 52074073 and U20A20272) to this study.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

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

    Ziwen Yan, Zhiyin Deng & Miaoyong Zhu

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

    Ziwen Yan, Zhiyin Deng & Miaoyong Zhu

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  1. Ziwen Yan
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  2. Zhiyin Deng
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  3. Miaoyong Zhu
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Correspondence to Zhiyin Deng or Miaoyong Zhu.

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Yan, Z., Deng, Z. & Zhu, M. Degradation Behavior of MgO Refractory by BOF Slags Containing Calcium Chloride. Metall Mater Trans B 53, 3115–3123 (2022). https://doi.org/10.1007/s11663-022-02590-7

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  • DOI: https://doi.org/10.1007/s11663-022-02590-7

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