Abstract The isothermal kinetics of zinc ferrite in a COCO2-Ar atmosphere were investigated by using thermogravimetric analysis (TGA). X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were applied in studying the mechanism of reduction roasting. Linear-fitting of the measured data indicates that the growth of nuclei model is the kinetic model, and the overall Ea was 72.75 kJ/mol; the kinetic equation was derived as follows: [ − ln ( 1 − α ) ] 3 2 = 3.1054 × 10 6 ⋅ P CO 0.766 ⋅ V CO 1.135 ⋅ e − 72.75 × 10 3 R T ⋅ t . The CO intensity impacts the reaction rate more significantly than the CO concentration. The XRD and XPS results of the roasted products reveal that due to the migration of zinc ions together with oxygen ions during reductive roasting, the generation of magnetite is much faster than zinc oxide, indicating that the nucleation of zinc oxide is the rate-determining step.

中文翻译：

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使用 CO-CO2-Ar 气体混合物还原锌铁氧体的等温动力学

摘要 利用热重分析(TGA) 研究了COCO2-Ar 气氛中铁酸锌的等温动力学。X射线衍射（XRD）和X射线光电子能谱（XPS）被应用于研究还原焙烧的机理。实测数据的线性拟合表明，核模型的增长为动力学模型，整体Ea为72.75 kJ/mol；动力学方程推导如下： [ − ln ( 1 − α ) ] 3 2 = 3.1054 × 10 6 ⋅ P CO 0.766 ⋅ V CO 1.135 ⋅ e − 72.75 × 10 3 RT ⋅ t 。CO 强度比 CO 浓度对反应速率的影响更显着。焙烧产物的XRD和XPS结果表明，由于还原焙烧过程中锌离子与氧离子一起迁移，磁铁矿的生成速度远快于氧化锌，