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In Situ Observation of Calcium Aluminate Inclusions Dissolution into Steelmaking Slag

  • Topical Collection: Advances in Materials Manufacturing and Processing
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Abstract

The dissolution rate of calcium aluminate inclusions in CaO-SiO2-Al2O3 slags has been studied using confocal scanning laser microscopy (CSLM) at elevated temperatures: 1773 K, 1823 K, and 1873 K (1500 °C, 1550 °C, and 1600 °C). The inclusion particles used in this experimental work were produced in our laboratory and their production technique is explained in detail. Even though the particles had irregular shapes, there was no rotation observed. Further, the total dissolution time decreased with increasing temperature and decreasing SiO2 content in the slag. The rate limiting steps are discussed in terms of shrinking core models and diffusion into a stagnant fluid model. It is shown that the rate limiting step for dissolution is mass transfer in the slag at 1823 K and 1873 K (1550 °C and 1600 °C). Further investigations are required to determine the dissolution mechanism at 1773 K (1500 °C). The calculated diffusion coefficients were inversely proportional to the slag viscosity and the obtained values for the systems studied ranged between 5.64 × 10−12 and 5.8 × 10−10 m2/s.

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Acknowledgments

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) and Canada Foundation for Innovation John Evans Leaders Fund (CFI JELF, Project Number: 32826) for funding this research.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Steel Research Centre, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada

    Keyan Miao, Alyssa Haas, Mukesh Sharma & Neslihan Dogan

  2. Department of Materials Science and Engineering, Royal Institute of Technology in Stockholm, Brinellvägen 8, 100 44, Stockholm, Sweden

    Wangzhong Mu

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  1. Keyan Miao
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  2. Alyssa Haas
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  3. Mukesh Sharma
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Correspondence to Keyan Miao.

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Manuscript submitted August 10, 2017.

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Miao, K., Haas, A., Sharma, M. et al. In Situ Observation of Calcium Aluminate Inclusions Dissolution into Steelmaking Slag. Metall Mater Trans B 49, 1612–1623 (2018). https://doi.org/10.1007/s11663-018-1303-y

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