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Effect of CaF2 on Phosphorus Refining from Molten Steel by Electric Arc Furnace Slag using Direct Reduced Iron (DRI) as a Raw Material

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Abstract

The effect of CaF2 addition on dephosphorization reaction between molten steel and electric arc furnace (EAF) slag using direct reduced iron (DRI) at 1823 K (1550 °C) was investigated. Basicity, the thermodynamic parameter affecting the removal capacity of phosphorus (i.e., phosphate capacity), decreased using DRI due to an increased SiO2 concentration in the slag. To minimize slag volume and maximize dephosphorization efficiency, the CaF2 was added to the slag. As CaF2 content increased (0 to 10 mass pct), dephosphorization efficiency also increased. Thermodynamic analysis in conjunction with slag structural studies using Raman spectroscopy were conducted to explain the complicated phenomena. The results exhibited that even 5 to 6 mass pct CaF2 can improve the dephosphorization efficiency when DRI is used as raw material in an EAF process.

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Acknowledgments

This work was supported by the Competency Development Program for Industry Specialists from the Korea Institute for Advancement of Technology (KIAT, Grant Number P0002019) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP, Grant Number 20172010106310), funded by the Ministry of Trade, Industry & Energy (MOTIE), Korea.

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  1. Department of Materials Engineering, Hanyang University, Ansan, 15588, Korea

    Min Kyo Oh, Tae Sung Kim & Joo Hyun Park

  2. Department of Materials Science and Engineering, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden

    Joo Hyun Park

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  1. Min Kyo Oh
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Manuscript submitted May 22, 2020.

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Oh, M.K., Kim, T.S. & Park, J.H. Effect of CaF2 on Phosphorus Refining from Molten Steel by Electric Arc Furnace Slag using Direct Reduced Iron (DRI) as a Raw Material. Metall Mater Trans B 51, 3028–3038 (2020). https://doi.org/10.1007/s11663-020-01957-y

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