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Oxidation pathway and kinetics of titania slag powders during cooling process in air

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  • Available online: 20 February 2020
  • The oxidation pathway and kinetics of titania slag powders in air were analyzed through differential scanning calorimetry (DSC) and thermogravimetry (TG). The oxidation pathway of titania slag powders in air is divided into three stages according to three exothermic peaks and three corresponding mass gain stages displayed in the non-isothermal DSC and TG curves respectively. The isothermal oxidation kinetics of high titania slag powders with different sizes were analyzed through ln-ln analysis method. The entire isothermal oxidation process includes the following two stages. The kinetic mechanism of first stage is described as f(α)=1.77(1-α)[-ln(1-α)]((1.77-1)/1.77),f(α)=1.97(1-a)[-ln(1-a)]((1.97-1)/1.97), and f(α)=1.18(1-α)[-ln(1-α)]((1.18-1)/1.18); whereas the kinetic mechanism of second stage for all samples can be described as[1-(1-α)(1/3)]2=kt. The activation energies of titania slag powders with different sizes (d1 < 0.075 mm, 0.125 < d2 < 0.150 mm, and 0.425 < d3 < 0.600 mm) at different reaction degrees are calculated. Under the current experimental conditions, the rate-controlling step at the first oxidation stage of all samples is a chemical reaction. The rate-controlling steps at the second oxidation stage are the chemical reaction and internal diffusion (d1<0.075 mm) and the internal diffusion (0.125 < d2 < 0.150 mm and 0.425 < d3 < 0.600 mm).
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    • This work was supported by the National Key Research and Development Program of China (2018YFC1900500) and Graduate Research and Innovation Foundation of Chongqing (Grant number CYB17002).

     

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Oxidation pathway and kinetics of titania slag powders during cooling process in air

  • Corresponding author:

    Xue-wei Lv    E-mail: lvxuewei@cqu.edu.cn

  • 1) State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
  • 2) Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China
  • 3) College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
  • 4) College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China
  • 5) WMG, University of Warwick, Coventry, CV4 7AL, UK
    Available online: 20 February 2020

Abstract: The oxidation pathway and kinetics of titania slag powders in air were analyzed through differential scanning calorimetry (DSC) and thermogravimetry (TG). The oxidation pathway of titania slag powders in air is divided into three stages according to three exothermic peaks and three corresponding mass gain stages displayed in the non-isothermal DSC and TG curves respectively. The isothermal oxidation kinetics of high titania slag powders with different sizes were analyzed through ln-ln analysis method. The entire isothermal oxidation process includes the following two stages. The kinetic mechanism of first stage is described as f(α)=1.77(1-α)[-ln(1-α)]((1.77-1)/1.77),f(α)=1.97(1-a)[-ln(1-a)]((1.97-1)/1.97), and f(α)=1.18(1-α)[-ln(1-α)]((1.18-1)/1.18); whereas the kinetic mechanism of second stage for all samples can be described as[1-(1-α)(1/3)]2=kt. The activation energies of titania slag powders with different sizes (d1 < 0.075 mm, 0.125 < d2 < 0.150 mm, and 0.425 < d3 < 0.600 mm) at different reaction degrees are calculated. Under the current experimental conditions, the rate-controlling step at the first oxidation stage of all samples is a chemical reaction. The rate-controlling steps at the second oxidation stage are the chemical reaction and internal diffusion (d1<0.075 mm) and the internal diffusion (0.125 < d2 < 0.150 mm and 0.425 < d3 < 0.600 mm).

Acknowledgements  This work was supported by the National Key Research and Development Program of China (2018YFC1900500) and Graduate Research and Innovation Foundation of Chongqing (Grant number CYB17002).

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