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Reaction Mechanism Between CO2 Bottom-Blowing Gas and Fe–Si/Mn/Al–C Melt

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Abstract

Molten steel used in the refining processes contains large amounts of alloy elements, such as Si, Mn, and Al. Similar to that in the Fe–C melt, the effect of CO2 in increasing the carbon and oxygen contents in melt-containing alloys determines its suitability as a bottom-blowing gas for refining processes. In this study, the reaction mechanism between CO2 and Fe–Si/Mn/Al–C melt at 1600 °C was analyzed. During the early stages of smelting, CO2 released carbon and oxygen into the melt. After reaching the critical composition of the melt, CO2 stopped releasing carbon into the melt, while continuing to decompose and release oxygen atoms, resulting in the oxidation of the alloy and carbon elements in the melt. Furthermore, this study investigated the reaction between CO as the bottom-blowing gas and the Fe–Si/Mn/Al–C melt, which established the partial dissolution of CO generated by the decomposition of CO2 released carbon from the melt. Consequently, the reaction of CO2 with an Fe-based melt was further confirmed to include the decomposition of CO2 into CO and oxygen, and equilibrium reaction of CO with carbon and oxygen.

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Author Contributions

All the authors contributed to the conception and design of the study. The material preparation, data collection, and analysis were performed by WW and BT. The writing—review and editing, and project administration were performed by GW. The first draft of the manuscript was written by WW, and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.

Funding

The authors would like to express their gratitude for the support of the China Post Postdoctoral Science Foundation (No.2022M712024) and the National Nature Science Foundation of China (No.52204318).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, P.R. China

    Wenhe Wu

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Guangsheng Wei & Bohan Tian

Authors
  1. Wenhe Wu
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  2. Guangsheng Wei
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  3. Bohan Tian
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Correspondence to Guangsheng Wei.

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Wu, W., Wei, G. & Tian, B. Reaction Mechanism Between CO2 Bottom-Blowing Gas and Fe–Si/Mn/Al–C Melt. Metall Mater Trans B 54, 2258–2273 (2023). https://doi.org/10.1007/s11663-023-02833-1

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  • DOI: https://doi.org/10.1007/s11663-023-02833-1

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