Dissolution behavior of Al2O3 inclusions into CaO–MgO–SiO2–Al2O3–TiO2 system ladle slags

Zhiyin Deng; Xiaomeng Zhang; Guangyu Hao; Chunxin Wei; Miaoyong Zhu

doi:10.1007/s12613-023-2817-0

Volume 31 Issue 5

May 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(5): 977-987

Zhiyin Deng, Xiaomeng Zhang, Guangyu Hao, Chunxin Wei, and Miaoyong Zhu, Dissolution behavior of Al₂O₃ inclusions into CaO–MgO–SiO₂–Al₂O₃–TiO₂ system ladle slags, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 977-987. https://doi.org/10.1007/s12613-023-2817-0

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Zhiyin Deng, Xiaomeng Zhang, Guangyu Hao, Chunxin Wei, and Miaoyong Zhu, Dissolution behavior of Al2O3 inclusions into CaO–MgO–SiO2–Al2O3–TiO2 system ladle slags, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 977-987. https://doi.org/10.1007/s12613-023-2817-0

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Research Article

Dissolution behavior of Al₂O₃ inclusions into CaO–MgO–SiO₂–Al₂O₃–TiO₂ system ladle slags

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Corresponding authors:
Zhiyin Deng E-mail: dengzy@smm.neu.edu.cn

Miaoyong Zhu E-mail: myzhu@mail.neu.edu.cn
Received: 9 September 2023; Revised: 23 November 2023; Accepted: 26 December 2023; Available online: 27 December 2023

Abstract

Abstract

To investigate the dissolution behaviors of Al₂O₃ inclusions in CaO–5wt%MgO–SiO₂–30wt%Al₂O₃–TiO₂ system ladle slags, confocal scanning laser microscopy was conducted on the slags with different TiO₂ contents (0–10wt%), and scanning electron microscopy was performed to study the interfacial reaction between Al₂O₃ and this slag system. The results disclose that the dissolution of Al₂O₃ inclusions does not result in the formation of new phases at the boundary between the slag and the inclusions. In TiO₂-bearing and TiO₂-free ladle slags, there is no difference in the dissolution mechanism of Al₂O₃ inclusions at steelmaking temperatures. Boundary layer diffusion is found as the controlling step of the dissolution of Al₂O₃, and the diffusion coefficient is in the range of 4.18 × 10⁻¹⁰ to 2.18 × 10⁻⁹ m²/s at 1450–1500°C. Compared with the solubility of Al₂O₃ in the slags, slag viscosity and temperature play a more profound role in the dissolution of Al₂O₃ inclusions. A lower viscosity and a lower melting point of the slags are beneficial for the dissolution. Suitable addition of TiO₂ (e.g., 5wt%) in ladle slags can enhance the dissolution of Al₂O₃ inclusions because of the low viscosity and melting point of the slags, while excessive addition of TiO₂ (e.g., 10wt%) shows the opposite trend.
- inclusions;
- dissolution;
- ladle refining slag;
- titanium dioxide;
- confocal scanning laser microscopy

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