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Dissolution Behavior of Sn in CaO–CaF2 Molten Flux and Its Distribution Ratio Between CaO–CaF2 Molten Flux and Liquid Iron

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Abstract

The dissolution behavior of Sn in CaO–\(\hbox {CaF}_2\) flux was investigated. A chemical equilibration technique was employed which allows pure liquid Sn dissolves into the molten flux under various oxygen partial pressure and the flux composition. At an equilibrium, (% Sn) in the flux increased by increasing (% CaO) and \(p_{\text{O}_2}\). It was found that Sn dissolves into the molten flux as (\(\hbox {SnO}_3\))\(^{4-}\) in the condition of the present study. Distribution of Sn between CaO saturated flux and C saturated liquid Fe was measured under a pure CO atmosphere. Sn distribution ratio (\(L_{\text{Sn}} = (\%\,\text{Sn})_{\text{flux}}/[\%\,\text{Sn}]_{\text{iron}}\)) was as low as \(\sim 10^{-4}\), which was consistent with a thermodynamic prediction. Sn distribution was favored at a lower temperature. Thermodynamic modeling was carried out for the Sn dissolution in the flux. A noticeable negative deviation between CaO and SnO was identified.

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Notes

  1. \(p_{\text{O}_2} = P_{\text{O}_2}(\text{Pa}) / P_{\text{O}_2}^\circ \text{(= 101, 32 5 Pa)}\)

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Acknowledgements

This research was financially supported by POSCO. Some of the present authors thank Mr. W.-B. Park, POSTECH, for his help during a part of experimental work.

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Authors and Affiliations

  1. Graduate Institute of Ferrous and Energy Materials Technology, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea

    Dong-Hyun Kim, Yong-Min Cho & Youn-Bae Kang

  2. Technical Research Laboratories, POSCO, Pohang, Kyungbuk, 57807, Republic of Korea

    Sang-Chae Park & Seong-Yeon Kim

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  1. Dong-Hyun Kim
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  2. Yong-Min Cho
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  4. Seong-Yeon Kim
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Correspondence to Youn-Bae Kang.

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Kim, DH., Cho, YM., Park, SC. et al. Dissolution Behavior of Sn in CaO–CaF2 Molten Flux and Its Distribution Ratio Between CaO–CaF2 Molten Flux and Liquid Iron. JOM 73, 1080–1089 (2021). https://doi.org/10.1007/s11837-020-04553-2

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