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In Situ Microscale Observation of FeOx–SiO2 Interfacial Reaction

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Abstract

Promoting the interfacial reaction between iron oxide (FeOx) particles generated from concentrate and silica-flux in the reaction shaft is essential to make the slag with good flowability and ensure matte separation in the settler of the flash furnace. The interfacial reaction of micro-meter-order-sized FeOx particles in contact with silica-flux was observed using high-temperature microscopy, and the slag formation behavior was successfully observed directly with this system. The main product of FeS oxidation is Fe3O4 in the flash furnace operation condition, and the reaction temperature between Fe3O4 and SiO2 is considerably higher than the typical melt temperature in the settler. On the other hand, when FeS coexisted with Fe3O4, the reaction temperature with SiO2 was significantly lowered. It was shown that the coexistence of FeS with Fe3O4 and SiO2 is the key to the removal of Fe3O4 and the formation of FeOx–SiO2 slag in the reaction shaft. The effect of the particle size, the composition of silica-flux, and the partial pressure of O2 on the reaction were also investigated in this study. It was shown that the observation method reported here has the potential for obtaining the reaction kinetics of interfacial slag formation reactions.

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Acknowledgments

The authors are grateful to Akihisa Ito and Miho Hayasaka of the Institute of Multidisciplinary Research for Advanced Materials (IMRAM), who helped determine the experimental methodology.

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Authors and Affiliations

  1. Sumitomo Metal Mining Co., LTD, 11-3 Shinbashi 5-chome, Minato-ku, Tokyo, 105-8716, Japan

    Yuko Goto & Jun-ichi Takahashi

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

    Yuko Goto

  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi, 980-8577, Japan

    Shungo Natsui & Hiroshi Nogami

  4. Energy Science and Technology Department, Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan

    Sakiko Kawanishi

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Goto, Y., Kawanishi, S., Natsui, S. et al. In Situ Microscale Observation of FeOx–SiO2 Interfacial Reaction. Metall Mater Trans B 55, 1735–1753 (2024). https://doi.org/10.1007/s11663-024-03063-9

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