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Dissolution of Sapphire and Alumina–Magnesia Particles in CaO–SiO 2 –Al 2 O 3 Liquid Slags

Chapter


Abstract


  • Understanding the dissolution kinetics of non-metallic inclusions in liquid slag is key in optimization of slag composition for inclusion removal. In this study, the rate of dissolution of high-precision spheres of sapphire and alumina–magnesia particles in CaO–SiO 2 –Al 2 O 3 liquid slags was measured in situ using a laser scanning confocal microscope at 1500 °C. It was found that the rate of dissolution of both sapphire and alumina–magnesia particles increased when the slag basicity is increased. A layer was observed around the dissolving sapphire. This layer may be a product layer and/or indicative of a mass transfer rate-controlling system. In the case of alumina–magnesia particle, the kinetics appeared more complex and depended on slag composition. No product layer or mass transfer layer was observed around the particle dissolving in slag with low basicity, whereas for the high basicity slag, a product or stagnant layer was observed, similar to that of the sapphire particle. Assuming a mass transfer-controlled system, measured diffusion coefficients for sapphire particles in slags tested in this study ranged from 10 −11 to 10 −10 m 2 s −1 at 1500 °C.

UOW Authors


  •   Abdeyazdan, Hamed (external author)
  •   Dogan, Neslihan (external author)
  •   Longbottom, Raymond
  •   Rhamdhani, Muhammad A. (external author)
  •   Chapman, Michael W. (external author)
  •   Monaghan, Brian

Publication Date


  • 2019

Citation


  • Abdeyazdan, H., Dogan, N., Longbottom, R. J., Rhamdhani, M. Akbar., Chapman, M. W. & Monaghan, B. J. (2019). Dissolution of Sapphire and Alumina–Magnesia Particles in CaO–SiO 2 –Al 2 O 3 Liquid Slags. In J. Nakano, P. Chris. Pistorius, C. Tamerler, H. Yasuda, Z. Zhang, N. Dogan, W. Wang, N. Saito & B. Webler (Eds.), Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies (pp. 61-73). Switzerland: Springer International Publishing AG.

International Standard Book Number (isbn) 13


  • 9783030061425

Scopus Eid


  • 2-s2.0-85064063376

Book Title


  • Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies

Start Page


  • 61

End Page


  • 73

Place Of Publication


  • Switzerland

Abstract


  • Understanding the dissolution kinetics of non-metallic inclusions in liquid slag is key in optimization of slag composition for inclusion removal. In this study, the rate of dissolution of high-precision spheres of sapphire and alumina–magnesia particles in CaO–SiO 2 –Al 2 O 3 liquid slags was measured in situ using a laser scanning confocal microscope at 1500 °C. It was found that the rate of dissolution of both sapphire and alumina–magnesia particles increased when the slag basicity is increased. A layer was observed around the dissolving sapphire. This layer may be a product layer and/or indicative of a mass transfer rate-controlling system. In the case of alumina–magnesia particle, the kinetics appeared more complex and depended on slag composition. No product layer or mass transfer layer was observed around the particle dissolving in slag with low basicity, whereas for the high basicity slag, a product or stagnant layer was observed, similar to that of the sapphire particle. Assuming a mass transfer-controlled system, measured diffusion coefficients for sapphire particles in slags tested in this study ranged from 10 −11 to 10 −10 m 2 s −1 at 1500 °C.

UOW Authors


  •   Abdeyazdan, Hamed (external author)
  •   Dogan, Neslihan (external author)
  •   Longbottom, Raymond
  •   Rhamdhani, Muhammad A. (external author)
  •   Chapman, Michael W. (external author)
  •   Monaghan, Brian

Publication Date


  • 2019

Citation


  • Abdeyazdan, H., Dogan, N., Longbottom, R. J., Rhamdhani, M. Akbar., Chapman, M. W. & Monaghan, B. J. (2019). Dissolution of Sapphire and Alumina–Magnesia Particles in CaO–SiO 2 –Al 2 O 3 Liquid Slags. In J. Nakano, P. Chris. Pistorius, C. Tamerler, H. Yasuda, Z. Zhang, N. Dogan, W. Wang, N. Saito & B. Webler (Eds.), Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies (pp. 61-73). Switzerland: Springer International Publishing AG.

International Standard Book Number (isbn) 13


  • 9783030061425

Scopus Eid


  • 2-s2.0-85064063376

Book Title


  • Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies

Start Page


  • 61

End Page


  • 73

Place Of Publication


  • Switzerland