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Dissolution Behavior of Aluminum Titanate Inclusions in Steelmaking Slags

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Abstract

The current work investigates the dissolution path and mechanism of aluminum titanate inclusions in steelmaking slags using a high-temperature confocal scanning laser microscope (CSLM). To study this phenomenon, a single particle of aluminum titanate is dissolved in slag at 1773 K. During the dissolution process, gas bubble evolution is observed. Further, the particle–slag system is rapidly quenched using helium at different stages of dissolution. The quenched samples are examined for distribution of the constituent elements: Al, Ti, Ca, and Si using the scanning electron microscope (SEM). Phases such as alumina, titanium-rich slag, and calcium titanate are detected at the particle–slag interface. The dissolution path of aluminum titanate is proposed in the following steps. First, aluminum titanate dissociates into alumina, titanium oxide, and oxygen while slag penetrates through the particle. In the next step, the alumina and titanium oxide dissolve in slag, and the oxygen leaves the system. The existence of gas bubbles enhances the overall rate of Al2TiO5 dissolution. The dissolution of Al2TiO5 appears to be controlled by mass transfer in the slag. Evidence in support of this finding is the particle–slag interface characterization by line scan analysis and calculated diffusivity values being inversely proportional to the viscosity of slag.

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Acknowledgments

The authors would like to acknowledge the support of the Natural Sciences and Engineering Research Council of Canada (NSERC, Project No. 20000514) for funding this research. This research used a high-temperature confocal laser scanning microscope—SVF17SP funded by Canada Foundation for Innovation John Evans Leaders Fund (CFI JELF, Project Number: 32826) and a scanning electron microscope—JEOL 6610 located at the Canadian Centre for Electron Microscopy at McMaster University.

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  1. Department of Materials Science and Engineering, Faculty of Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L7, Canada

    Mukesh Sharma & Neslihan Dogan

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  1. Mukesh Sharma
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  2. Neslihan Dogan
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Correspondence to Mukesh Sharma.

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Sharma, M., Dogan, N. Dissolution Behavior of Aluminum Titanate Inclusions in Steelmaking Slags. Metall Mater Trans B 51, 570–580 (2020). https://doi.org/10.1007/s11663-019-01762-2

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