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Metal Emulsion Behavior of Droplets with Various Sizes in the Na2B4O7/Sn Alloy System by Bottom Bubbling Gas and its Comparison with the Chloride/Sn System

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Abstract

Mass transfer is the rate-controlling step of chemical reactions in steelmaking process. The passage of gas bubbles through the interface between the liquid iron and slag phases generates a metal emulsion. This increases the interface area between the two phases and improves the chemical reaction efficiency, e.g., of decarburization and desulfurization. In this study, a Sn alloy and sodium tetraborate were used to simulate molten steel and slag owing to their similar physical properties with actual molten steel/slag system. Molten slag from different depths was sampled during bubbling at various gas flow rates. Metal droplets were separated from the slag phase by dissolution in a solvent mixture of water and glycerin. The number and diameter of metal droplets with diameters in the range of 0.1 to 1 mm were measured. 5 to 50 metal droplets were observed in 1 g of the slag phase during bubbling. The total number and mass of the droplets increased with increasing gas flow rate. The droplet formation rate was estimated. Compared with the results of our previous study on droplets with diameter in the range of 2 to 100 μm, it was the large droplets that contributed the most to the total mass of the metal emulsion despite their number being smaller. The effect of the viscosity of the upper phase was studied and compared with results obtained with the Sn/chloride system. The metal droplet formation rate decreased with increasing viscosity of the upper phase.

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Acknowledgment

The authors profoundly thank Professor Hiroshi Nogami of Tohoku University for his discussions.

Author information

Author notes

  1. Jiang Liu

    Present address: Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo, 152-8550, Japan

  2. Sun-joong Kim

    Present address: Department of Materials Science and Engineering, College of Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju, 61452, Korea

Authors and Affiliations

  1. Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Jiang Liu

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan

    Sun-joong Kim

  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8055, Japan

    Xu Gao, Shigeru Ueda & Shin-ya Kitamura

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  1. Jiang Liu
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  2. Sun-joong Kim
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  3. Xu Gao
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  4. Shigeru Ueda
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  5. Shin-ya Kitamura
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Corresponding author

Correspondence to Jiang Liu.

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Manuscript submitted February 27, 2017.

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Liu, J., Kim, Sj., Gao, X. et al. Metal Emulsion Behavior of Droplets with Various Sizes in the Na2B4O7/Sn Alloy System by Bottom Bubbling Gas and its Comparison with the Chloride/Sn System. Metall Mater Trans B 48, 2583–2594 (2017). https://doi.org/10.1007/s11663-017-1054-1

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  • DOI: https://doi.org/10.1007/s11663-017-1054-1

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