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<p>An electrochemical engineering model demonstrates the production of CF<sub>4</sub> in an aluminum reduction cell without invoking any special anode effect behavior or intermediate COF<sub>2</sub>. This is accomplished through a standard application of the thermodynamics for the reaction depolarized by alumina and taking account of the concentrations of the reactants and products at the anode surface. The kinetic parameters of the CF<sub>4</sub> reaction are only poorly known and are estimated by fitting the model results to in-plant measurements. The other components of the model are used in typical descriptions of Hall–Heroult cell voltage components. The model results show trends in the sensitivity of the CF<sub>4</sub> rate to alumina, current density, AlF<sub>3</sub> concentration, anode height, and ACD that are consistent with available measurements. Finally, the model is simple enough in operation to be implemented in a dynamic cell-scale model, serving as a useful tool to examine control and alumina feeding strategies to minimize CF<sub>4</sub> production.</p>

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Model of Low-Voltage Formation of CF4 During Primary Reduction of Aluminum

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Donald P. Ziegler

摘要

An electrochemical engineering model demonstrates the production of CF4 in an aluminum reduction cell without invoking any special anode effect behavior or intermediate COF2. This is accomplished through a standard application of the thermodynamics for the reaction depolarized by alumina and taking account of the concentrations of the reactants and products at the anode surface. The kinetic parameters of the CF4 reaction are only poorly known and are estimated by fitting the model results to in-plant measurements. The other components of the model are used in typical descriptions of Hall–Heroult cell voltage components. The model results show trends in the sensitivity of the CF4 rate to alumina, current density, AlF3 concentration, anode height, and ACD that are consistent with available measurements. Finally, the model is simple enough in operation to be implemented in a dynamic cell-scale model, serving as a useful tool to examine control and alumina feeding strategies to minimize CF4 production.