| Summary: | The reduction of Fe<sub>2</sub>O<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> is one of the important reactions in the resource utilization of iron-containing oxide waste. Fe<sub>2</sub>O<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> was electro-deoxidized in the NaCl-KCl system by molten salt electrolysis to prepare FeO/Al<sub>2</sub>O<sub>3</sub>. The effect of the Fe<sub>2</sub>O<sub>3</sub> content on the electro-deoxidation reaction process was studied. The results show that under the conditions of 850 °C, 2.3 V, and electro-deoxidation for 4 h, FeO/Al<sub>2</sub>O<sub>3</sub> could be obtained by controlling the content of Fe<sub>2</sub>O<sub>3</sub>. The deoxidation process was divided into three stages: electric double layer charging, Fe<sub>2</sub>O<sub>3</sub> electro-deoxidation to Fe<sub>3</sub>O<sub>4</sub>, and Fe<sub>3</sub>O<sub>4</sub> electro-deoxidation to FeO. With the increase in the Fe<sub>2</sub>O<sub>3</sub> content, the deoxidation reaction rate increased, and the low-valence iron oxide particles obtained by electro-deoxidation became larger. The mechanism of the influence of Fe<sub>2</sub>O<sub>3</sub> on the electro-deoxygenation process was determined by analyzing the experimental results. The increase in the Fe<sub>2</sub>O<sub>3</sub> content increased the concentration of activated molecules in the system, while it reduced the resistance of electro-deoxidation. The migration of active particles in the cathode was smoother, which increased the percentage of deoxygenation of activated molecules, thereby shortening the process of the deoxidation reaction.
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