The oxidation pathway and kinetics of titania slag powders in air were analyzed using differential scanning calorimetry (DSC) and thermogravimetry (TG). The oxidation pathway of titania slag powder in air was divided into three stages according to their three exothermic peaks and three corresponding mass gain stages indicated by the respective non-isothermal DSC and TG curves. The isothermal oxidation kinetics of high titania slag powders of different sizes were analyzed using the ln-ln analysis method. The results revealed that the entire isothermal oxidation process comprises two stages. The kinetic mechanism of the first stage can be described as f (α) = 1.77(1 − α)[−ln(1 − α)]^{(1.77 − 1)/1.77}, f (α) = 1.97(1 − α)[−ln(1 − α)]^{(1.97−1)/1.97}, and f (α) = 1.18(1 − α)[−ln(1 − α)]^{(1.18−1)/1.18}. The kinetic mechanism of the second stage for all samples can be described as f (α) = 1.5(1 − α)^2/3[1 − (1 − α)^1/3]⁻¹. The activation energies of titania slag powders with different sizes (d₁ < 0.075 mm, 0.125 mm < d₂ < 0.150 mm, and 0.425 mm < d₃ < 0.600 mm) for different reaction degrees were calculated. For the given experimental conditions, the rate-controlling step in the first oxidation stage of all the samples is a chemical reaction. The rate-controlling steps of the second oxidation stage are a chemical reaction and internal diffusion (for powders d₁ < 0.075 mm) and internal diffusion (for powders 0.125 mm < d₂ < 0.150 mm and 0.425 mm < d₃ < 0.600 mm).

使用差示扫描量热法 (DSC) 和热重法 (TG) 分析了二氧化钛渣粉在空气中的氧化途径和动力学。二氧化钛渣粉在空气中的氧化路径根据其三个放热峰和相应的三个非等温 DSC 和 TG 曲线表明的质量增加阶段分为三个阶段。采用ln-ln分析法分析了不同粒径高钛渣粉的等温氧化动力学。结果表明，整个等温氧化过程包括两个阶段。第一阶段的动力学机制可以描述为f ( α ) = 1.77(1 − α )[−ln(1 − α )] ^{(1.77 − 1)/1.77}，f ( α ) = 1.97(1 − α )[−ln(1 − α )] ^{(1.97−1)/1.97}，并且f ( α ) = 1.18(1 − α )[−ln(1 − α )] ^{( 1.18-1)/1.18}。所有样品的第二阶段的动力学机制可以描述为f ( α ) = 1.5(1 − α ) ^2/3 [1 − (1 − α ) ^1/3 ] ^-1。不同尺寸( d ₁ < 0.075 mm, 0.125 mm < d _2)的二氧化钛渣粉的活化能< 0.150 mm 和 0.425 mm < d ₃ < 0.600 mm) 计算不同反应程度。对于给定的实验条件，所有样品的第一氧化阶段的速率控制步骤是化学反应。第二氧化阶段的速率控制步骤是化学反应和内部扩散（对于粉末d ₁ < 0.075 mm）和内部扩散（对于粉末 0.125 mm < d ₂ < 0.150 mm 和 0.425 mm < d ₃ < 0.600 mm） .