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Additive Effect of Al2O3, CaO, and MgO on the Viscosity of FeOx–SiO2 Slag Melt (x = 1.0–1.5)

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Abstract

The viscosity measurement of FeO–SiO2–Al2O3–CaO–MgO synthesized slag via inner cylinder-rotation method revealed the effects of Al2O3, CaO, and MgO on the viscosity of FeOx–SiO2 (x = 1.0–1.5) slag melt under the oxygen partial pressure of 4.0 × 10−8 atm at 1200 °C–1300 °C. The spindle and crucible material were Pt–30%Rh, which has high corrosion resistance and maintains sufficient strength in high-temperature melts. The thermodynamic calculation using FactSage predicted the slag components, solid-phase crystallization conditions, and abundance ratio of FeO and Fe2O3 in the slag samples under the melt conditions. The predictions were based on the measured oxygen partial pressure in the slag melt using a self-made zirconia oxygen sensor and analyzed components of the quenched slag samples after viscosity measurement. The viscosity of the slag increased with increasing Al2O3 content (4.0–12.0 mass%) and decreased with increasing CaO and MgO contents (0.0–8.0 and 0.0–6.0 mass%, respectively). A multiregression analysis based on the slag composition and their experimental viscosity was used in deriving the viscosity prediction equation for FeO–SiO2–Al2O3–CaO–MgO slag.

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Acknowledgements

This study was funded by the Mining and Materials Processing Institute of Japan under a Grant-in-Aid.

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  1. Taichi Eguchi

    Present address: Technology Development Center Saganoseki Branchi, 3-3382 Saganoseki, Oita, Oita, 879-2201, Japan

Authors and Affiliations

  1. Department of Materials Science and Biotechnology, Graduate School of Science and Technology, Ehime University, 3, Bunkyo‑cho, Matsuyama, Ehime, 790‑8577, Japan

    Taichi Eguchi, Nobuyasu Nishioka & Hiromichi Takebe

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  1. Taichi Eguchi
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Correspondence to Nobuyasu Nishioka.

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Eguchi, T., Nishioka, N. & Takebe, H. Additive Effect of Al2O3, CaO, and MgO on the Viscosity of FeOx–SiO2 Slag Melt (x = 1.0–1.5). J. Sustain. Metall. 9, 1487–1498 (2023). https://doi.org/10.1007/s40831-023-00741-x

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