Abstract
The silicothermic reduction process under vacuum is currently the main method for the production of metallic magnesium from calcined dolomite ore. In this paper, the experimental data from ThanhHoa dolomite ore reduction investigations are used to analyze the kinetics of the reduction process of calcined dolomite. Several kinetic models have been investigated to evaluate the rate control step of the reduction reaction. The results show that solid-state diffusion is the controlling stage of the reduction reaction. The activation energy of the reduction reaction under vacuum is 203.2 kJ/mol. Experimental factors affecting the reaction rate are studied, including temperature, ferrosilicon ratio, briquetting pressure. From the analysis results, it can be determined that silicon diffusion is the main factor controlling the diffusion phase.
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Quyen, V.V., Trang, V.T.T., Nam, N.D. (2023). Reaction Kinetics of the Extraction of Magnesium from Dolomite via the Silicothermic Reduction Process. In: Long, B.T., et al. Proceedings of the 3rd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2022). MMMS 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-31824-5_33
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DOI: https://doi.org/10.1007/978-3-031-31824-5_33
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