Abstract
The dissolution of Al2O3 particles in CaO-Al2O3-SiO2 slags was investigated by confocal scanning laser microscope at the temperature range from 1723 K to 1853 K. It was found that the rate-limiting step was the diffusion in the liquid slag. The dissolution of Al2O3 particles in CaO-Al2O3-SiO2 slags with various temperatures, CaO/Al2O3, and CaO/SiO2 in slag was in situ observed. Increasing the C/A and C/S of slag promoted the absorption of Al2O3 inclusions by the CaO-Al2O3-SiO2 slag, but only if the slag was pure liquid at the refining temperature. A model related to dissolution driving force and slag viscosity was shown to be v = 18.716 × ΔC/η to predict the dissolution rate of Al2O3. Effective binary diffusion coefficients for various CaO-Al2O3-rich slags were obtained using the developed model. The dissolution rate of Al2O3 in CaO-Al2O3-SiO2 slags with low SiO2 content at the steelmaking temperature was predicted.
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26 July 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11663-021-02281-9
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Acknowledgments
The authors are grateful for support from the National Nature Science Foundation of China (Grant No. U1860206, No. 51725402), Fundamental Research Funds for the Central Universities (Grant Nos. FRF-TP-17-001C2 and FRF-TP-19-037A2Z), the S&T Program of Hebei (Grant Nos. 20311004D, 20311005D, 20311006D, 20591001D), the High Steel Center (HSC) at Yanshan University, and Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM) and the High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing (USTB), China.
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Manuscript submitted 11 January 2021; accepted 7 June 2021.
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Ren, C., Zhang, L., Zhang, J. et al. In Situ Observation of the Dissolution of Al2O3 Particles in CaO-Al2O3-SiO2 Slags. Metall Mater Trans B 52, 3288–3301 (2021). https://doi.org/10.1007/s11663-021-02256-w
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DOI: https://doi.org/10.1007/s11663-021-02256-w