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Effect of the Slag Composition on the Sustainable Silicothermic Synthesis Process of Titanium Silicides

Author

Listed:
  • Ziyou Yu

    (cMACS, M2S, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium)

  • Jie Dang

    (National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)

  • Zhiyuan Chen

    (Electrochemistry Excellence Centre (ELEC), Materials & Chemistry Unit, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium)

Abstract

TiSi 2 and Ti 5 Si 3 were synthesized through a simple and cost-effective process, providing a sustainable way to recycle titanium oxide and silicon wastes from industry. The reaction process was investigated at 1500 °C under various slag/silicon ratios and slag compositions. TiSi 2 was synthesized successfully under all experimental conditions, with nearly complete extraction of titanium oxide from the slag within 5 h under optimized conditions. TiSi 2 initially formed at the slag/silicon interface, followed by the formation of Ti 5 Si 3 as TiSi 2 droplets fell through the slag. The production rate of TiSi 2 was higher than that of Ti 5 Si 3 . Kinetic analysis showed that the reaction rate constant ranged from 1.2 × 10 −5 to 4.3 × 10 −4 s −1 . Viscosity and basicity were not the limiting factors of the kinetics in this work. The amount of TiO 2 in the slag significantly influenced the reaction process, with slag containing less than 30 mol% TiO 2 identified as optimal for efficient titanium extraction and a high synthesis rate.

Suggested Citation

  • Ziyou Yu & Jie Dang & Zhiyuan Chen, 2025. "Effect of the Slag Composition on the Sustainable Silicothermic Synthesis Process of Titanium Silicides," Sustainability, MDPI, vol. 17(9), pages 1-14, April.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:9:p:3994-:d:1645319
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