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

Wen-chao He; Cheng-yi Ding; Xue-wei Lv; Zhi-ming Yan

doi:10.1007/s12613-020-2019-y

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Wen-chao He, Cheng-yi Ding, Xue-wei Lv, and Zhi-ming Yan, Oxidation pathway and kinetics of titania slag powders during cooling process in air, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-020-2019-y

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Wen-chao He, Cheng-yi Ding, Xue-wei Lv, and Zhi-ming Yan, Oxidation pathway and kinetics of titania slag powders during cooling process in air, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-020-2019-y

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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

Abstract

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).
- high titania slag powder,
- oxidation pathway,
- isothermal oxidation kinetics,
- ln-ln analysis,
- activation energy,
- rate-controlling step

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