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Structure and Viscosity of Molten CaO-SiO2-FexO Slag During the Early Period of Basic Oxygen Steelmaking

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Abstract

According to the composition variation during the initial period of basic oxygen steelmaking, ice-quenched samples of the CaO-SiO2-FexO system were prepared, and the viscosity and structure of molten slag were further analyzed by a rotary viscometer and Raman spectroscopy, respectively. The results showed that Si4+ existed as Q0, Q1, Q2 and Q3 units. The O2− ions led to the depolymerization of [SiO4] tetrahedrons from Q3 to Q0 units with increasing Ca/Fe ratio. For Fe3+ cations, two types of [FeO4] tetrahedron and [FeO6] octahedron coexisted in the molten slag, and coordination of Fe3+ transformed from tetrahedron to octahedron with the Ca/Fe ratio increasing to 3.18. Viscosity of molten slag showed a continuous decrease because of the simpler network. Moreover, to clarify the viscosity-structure relationship, the viscosity estimation equation applied to the CaO-SiO2-FexO-based system was established in terms of the deconvolution result of the melt structure.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51674069, 51974075), the National Key R & D Program of China (Grant No. 2017YFC0805100), the Open Funds of State Key Laboratory of Metal Material for Marine Equipment and Application (SKLMEA-K201911) and the Fundamental Research Funds for the Central Universities of China (Grant Nos. N182506001, N180725008).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang, 110819, Liaoning, P.R. China

    Rui Zhang, Yu Wang, Xuan Zhao, Chengjun Liu & Yi Min

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, P.R. China

    Rui Zhang, Yu Wang, Xuan Zhao, Chengjun Liu & Yi Min

  3. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114021, Liaoning, P.R. China

    Jixiang Jia & Yi Min

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  1. Rui Zhang
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Manuscript submitted July 31, 2019.

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Zhang, R., Wang, Y., Zhao, X. et al. Structure and Viscosity of Molten CaO-SiO2-FexO Slag During the Early Period of Basic Oxygen Steelmaking. Metall Mater Trans B 51, 2021–2029 (2020). https://doi.org/10.1007/s11663-020-01888-8

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  • DOI: https://doi.org/10.1007/s11663-020-01888-8

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