Abstract
The reduction kinetics of zinc ferrite in CO was investigated under isothermal conditions at different CO concentration and roasting temperature with the help of the thermogravimetric analysis (TGA). The reduction of zinc ferrite was a step-wise mechanism. As the model fitting results suggest, the first stage was controlled by the rate of first-order (when CO = 4%) or the second-order (when CO = 6%, 8%) reaction, with the Ea in 4%, 6%, and 8% of CO being 91.45 kJ mol−1, 73.08 kJ mol−1, and 73.49 kJ mol−1, correspondingly. Also, the diffusion of reactant proves to constitute the rate-determining step in the second stage, and the reaction model is R2 (contracting cylinder), wherein the Ea in 4%, 6%, and 8% of CO is 80.81 kJ mol−1, 59.11 kJ mol−1, and 59.19 kJ mol−1, correspondingly. The generation of magnetite and zinc oxide is the chemical reaction control, and the generation of ferrous oxide, metal iron was the diffusion control. The increase in the CO concentration from 4% to 6% or 8% could decrease the Ea and increase the reaction order, consequently, the reductive roasting was accelerated.
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The authors would like to thank National Key R&D Program of China (2018YFC1900300), National Science Fund for Distinguished Young Scholars (51825403), and National Natural Science Foundation of China (51574295) for financial support for this study.
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Wang, G., Min, X., Peng, N. et al. The isothermal kinetics of zinc ferrite reduction with carbon monoxide. J Therm Anal Calorim 146, 2253–2260 (2021). https://doi.org/10.1007/s10973-020-10542-z
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DOI: https://doi.org/10.1007/s10973-020-10542-z