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

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

doi:10.1007/s12613-020-2036-x

Volume 28 Issue 1

Jan. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(1): 66-75

Ge-fan Ye, Jian Yang, Run-hao Zhang, Wen-kui Yang, and Han Sun, Behavior of phosphorus enrichment in dephosphorization slag at low temperature and low basicity, Int. J. Miner. Metall. Mater., 28(2021), No. 1, pp. 66-75. https://doi.org/10.1007/s12613-020-2036-x

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Ge-fan Ye, Jian Yang, Run-hao Zhang, Wen-kui Yang, and Han Sun, Behavior of phosphorus enrichment in dephosphorization slag at low temperature and low basicity, Int. J. Miner. Metall. Mater., 28(2021), No. 1, pp. 66-75. https://doi.org/10.1007/s12613-020-2036-x

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Research Article

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

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Corresponding author:
Jian Yang E-mail: yang_jian@t.shu.edu.cn
Received: 7 January 2020; Revised: 4 March 2020; Accepted: 6 March 2020; Available online: 9 March 2020

Abstract

Abstract

At low basicity and low temperature, the dephosphorization behavior and phosphorus distribution ratio (L_P) 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 L_P 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.
- dephosphorization;
- basicity;
- phosphorus-rich phase;
- slag;
- converter steelmaking

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