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Physical Simulation and Industrial Testing of Bottom-Blown O2-CaO Converter for Steelmaking Process

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Abstract

Bottom-blowing O2-CaO steelmaking technology has numerous advantages such as low iron and steel consumptions, low dust emissions, and molten steel cleanliness. Responsive to a weak stirring and high iron oxide slag in a 120-ton conventional “combined blowing” converter in a factory, a cold model of bottom-blowing O2-CaO was designed. Bottom-blowing and top-blowing parameters on the mixing effect of bottom-blowing O2-CaO converter were studied. Two symmetrical points on 0.4R trunnion connection of the bottom-blowing converter were sought as the optimum hole location. The total flow rate of bottom–blowing and top-blowing was 8.2 and 75 Nm3/h, respectively. The optimum top-blowing position was 400 mm and the optimum solid–gas ratio was found to be 9.0. The optimum scheme under laboratory conditions was converted and applied to a 120-ton bottom-blown O2-CaO converter; subsequently, hundred industrial tests were performed. The stirring strength of the molten bath was enhanced remarkably and the metallurgical effect was improved remarkably. Carbon and oxygen product of the end-point molten steel was reduced by 5.87 × 10−4 while the iron oxide content in the final slag was reduced by 1.99 pct. This laid a foundation for industrial applications of the bottom-blown O2-CaO converter steelmaking technology.

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Acknowledgments

This work was financially supported by the National Natural Science 240 Foundation of China (Grant Nos. 51574021 and 51474024).

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Authors and Affiliations

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

    Weifeng Li, Rong Zhu, Kai Dong, Jie Zhang, Chao Feng, Baochen Han & Xuetao Wu

  2. Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Weifeng Li, Rong Zhu, Kai Dong, Jie Zhang, Chao Feng, Baochen Han & Xuetao Wu

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  1. Weifeng Li
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  2. Rong Zhu
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  3. Kai Dong
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  5. Chao Feng
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Correspondence to Rong Zhu.

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Manuscript submitted October 23, 2019.

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Li, W., Zhu, R., Dong, K. et al. Physical Simulation and Industrial Testing of Bottom-Blown O2-CaO Converter for Steelmaking Process. Metall Mater Trans B 51, 1060–1069 (2020). https://doi.org/10.1007/s11663-020-01823-x

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  • DOI: https://doi.org/10.1007/s11663-020-01823-x

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