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Numerical investigation of basic oxygen furnace slag modification with gas bottom-blowing and SiO2 modifier

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Abstract

To avoid the volume expansion of basic oxygen furnace (BOF) slag for use in building materials, a hot slag modification process was proposed to reduce free CaO (f-CaO) in the molten slag. A transient 3D numerical model of BOF molten slag modification by SiO2 particles was established. The flow and heat transfer of molten slag, movement and dissolution of the modifier, and concentration distribution of f-CaO in slag during the modification of BOF were studied. The distribution of f-CaO concentration is inhomogeneous all over the molten slag. The mixing effect at the slag surface is weaker than that at the half-height plane of the slag. To consume the f-CaO below 2.0 wt.% in the slag, the optimum quantity of the SiO2 modifier is 10.0% of the mass of the slag. The fine SiO2 particles help attain a lower final mass fraction of f-CaO and a higher SiO2 utilization ratio.

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Acknowledgements

The authors’ gratitude goes to the National Natural Science Foundation of China (Grant Nos. U1860205 and 52204352), Young Elite Scientist Sponsorship Program by China Association for Science and Technology (Grant No. YESS20200210), and Youth Project of Hubei Natural Science Foundation (Grant No. 2022CFB593). Thanks are also given to Baoshan Iron & Steel Co., Ltd. for supporting plant data.

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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

    Chang Liu, Yu-feng Tian, Yang Li, Guang-qiang Li & Qiang Wang

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

    Chang Liu, Yu-feng Tian, Yang Li, Guang-qiang Li & Qiang Wang

  3. Ruipu Technology Group Co., Ltd., Lishui, 323900, Zhejiang, China

    Chang Liu

  4. Central Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai, 201900, China

    Yong-li Xiao & Yong-qian Li

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  1. Chang Liu
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Correspondence to Qiang Wang.

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Liu, C., Tian, Yf., Xiao, Yl. et al. Numerical investigation of basic oxygen furnace slag modification with gas bottom-blowing and SiO2 modifier. J. Iron Steel Res. Int. 30, 1451–1460 (2023). https://doi.org/10.1007/s42243-023-01009-0

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  • DOI: https://doi.org/10.1007/s42243-023-01009-0

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