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Behavior of phosphorus enrichment in dephosphorization slag at low temperature and low basicity

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Abstract

At low basicity and low temperature, the dephosphorization behavior and phosphorus distribution ratio (LP) between slag and molten steel in the double slag and remaining slag process were studied with a 180 t basic oxygen furnace industrial experiment. The dephosphorization slags with different basicities were quantitatively analyzed. At the lower basicity range of 0.9–2.59, both LP and dephosphorization ratio were increased as the basicity of dephosphorization slag increased. Dephosphorization slag consisted of dark gray P-rich, light gray liquid slag, and white Fe-rich phases. With increasing basicity, not only did the morphologies of different phases in the dephosphorization slag change greatly, but the area fractions and P2O5 content of the P-rich phase also increased. The transfer route of P during dephosphorization can be deduced as hot metal → liquid slag phase + Fe-rich phase → P-rich phase.

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Acknowledgement

This work was financially supported by the National Natural Science Foundation of China (No. U1960202).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Ge-fan Ye, Jian Yang, Run-hao Zhang, Wen-kui Yang & Han Sun

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  1. Ge-fan Ye
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Correspondence to Jian Yang.

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Ye, Gf., Yang, J., Zhang, Rh. et al. Behavior of phosphorus enrichment in dephosphorization slag at low temperature and low basicity. Int J Miner Metall Mater 28, 66–75 (2021). https://doi.org/10.1007/s12613-020-2036-x

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  • DOI: https://doi.org/10.1007/s12613-020-2036-x

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