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In Situ Observation of Dissolution of Oxide Inclusions in Steelmaking Slags

  • Advanced Real Time Optical Imaging
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Abstract

Better understanding of removal of non-metallic inclusions is of importance in the steelmaking process to control the cleanliness of steel. In this study, the dissolution rate of Al2O3 and Al2TiO5 inclusions in a liquid CaO-SiO2-Al2O3 slag was measured using high-temperature confocal scanning laser microscopy (HT-CSLM) at 1550°C. The dissolution rate of inclusions is expressed as a function of the rate of decrease of the radius of solid particles with time. It is found that Al2O3 inclusions have a slower dissolution rate than that of Al2TiO5 inclusions at 1550°C. The rate-limiting steps are investigated in terms of a shrinking core model. It is shown that the rate-limiting step for dissolution of both inclusion types is mass transfer in the slag at 1550°C.

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Acknowledgements

The authors would like to thank the Natural Sciences and Engineering Research Council (Project No. 20000514) and Canada Foundation for Innovation John Evans Leaders Fund (CFI JELF, Project No. 32826).

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Authors and Affiliations

  1. Steel Research Centre, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L7, Canada

    Mukesh Sharma & Neslihan Dogan

  2. KTH Royal Institute of Technology, Brinellvägen 23, 10044, Stockholm, Sweden

    Wangzhong Mu

Authors
  1. Mukesh Sharma
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  2. Wangzhong Mu
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  3. Neslihan Dogan
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Correspondence to Mukesh Sharma.

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Sharma, M., Mu, W. & Dogan, N. In Situ Observation of Dissolution of Oxide Inclusions in Steelmaking Slags. JOM 70, 1220–1224 (2018). https://doi.org/10.1007/s11837-018-2908-y

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  • DOI: https://doi.org/10.1007/s11837-018-2908-y

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