Abstract
The effect of oxygen supply systems and slag composition on dephosphorization rate in the early stage of smelting was studied. Metal samples, slag samples, and molten steel temperatures of a 300t converter at different smelting stages were analyzed. The alkalinity of slag was found to be the lowest at 1.33 during the early stage of the experiment, superheat was 7 °C, the mass fraction of C3MS2 phase was 35 wt%, and average dephosphorization rate was 32.2%. By optimizing the oxygen supply system and charging system of the converter, the alkalinity of slag was controlled in the range of 1.6–2.1 and the average content of T.Fe was 15 wt%. The results demonstrated a 10.2% increasment in dephosphorization rate during the early stage of smelting, 5.9% increasment in the scrap steel ratio, 31 °C increasment in the tapping temperature, and 0.65% increasment in the final dephosphorization rate.
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Acknowledgements
The authors would like to express their thanks for the support by the National Nature Science Foundation of China (No. 51574021).
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Feng, C., Zhu, R., Han, B., Dong, K., Li, W., Wei, G. (2020). Optimization Dephosphorization Process of the Early Stage in 300t Steelmaking Converter with Top and Bottom Combined Blowing. In: Peng, Z., et al. 11th International Symposium on High-Temperature Metallurgical Processing. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36540-0_11
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DOI: https://doi.org/10.1007/978-3-030-36540-0_11
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