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Comparison study on hot state modification of converter slag by adding Al2O3 or SiO2

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Abstract

The value-added utilization of converter steel slag is crucial, with China’s annual production having reached 100 million tons. The utilization of converter slag in the construction materials sector is limited as it undergoes volume expansion during the aging process, mainly caused by the hydration reaction of free calcium oxide present in the slag. The influence of alumina addition on the mineral transformation of typical industrial converter slag was investigated. Different quantities of alumina were introduced into the slag, and the original and modified slags were remelted under argon atmosphere, followed by quenching. The experimental results were compared with thermodynamic simulation calculations for further analysis. As the alumina content increases, it reacts with the free calcium oxide in slag, leading to the formation of low-melting-point calcium aluminoferrite. Additionally, alumina addition effectively reduces slag viscosity. Finally, an assessment of the energy consumption for alumina-modified and silica-modified converter slags was presented.

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Acknowledgements

The authors gratefully acknowledge the support from National Natural Science Foundation of China (No. 52004189), Project of Hubei Provincial Department of Science and Technology (Nos. 2022BAA021 and 2022CFB051), China Postdoctoral Science Foundation (Nos. 2023T160210 and 2022M721109), Young Elite Scientists Sponsorship Program by CAST (No. 2022QNRC001), and Wuhan University of Science and Technology Graduate Innovation and Entrepreneurship Fund (No. JCX2022009).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Yu-feng Tian, Guang-qiang Li & Yu Liu

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Guang-qiang Li & Yu Liu

  3. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China

    Guang-qiang Li

  4. China Baowu Steel Group Corporation Limited, Shanghai, 201900, China

    Yong-qian Li

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  1. Yu-feng Tian
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Correspondence to Yu Liu.

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Tian, Yf., Li, Gq., Li, Yq. et al. Comparison study on hot state modification of converter slag by adding Al2O3 or SiO2. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-023-01172-4

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  • DOI: https://doi.org/10.1007/s42243-023-01172-4

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