Abstract
The reduction of Fe2O3-Al2O3 is one of the important reactions in the resource utilization of iron-containing oxide waste. Fe2O3-Al2O3 was electro-deoxidized in the NaCl-KCl system by molten salt electrolysis to prepare FeO/Al2O3. The effect of the Fe2O3 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/Al2O3 could be obtained by controlling the content of Fe2O3. The deoxidation process was divided into three stages: electric double layer charging, Fe2O3 electro-deoxidation to Fe3O4, and Fe3O4 electro-deoxidation to FeO. With the increase in the Fe2O3 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 Fe2O3 on the electro-deoxygenation process was determined by analyzing the experimental results. The increase in the Fe2O3 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.
Highlights
Fe2 O3 and Al2 O3 are the main components of solid waste such as red mud, blast furnace slag, and zinc kiln slag [1,2,3]
The reduction reaction of the Fe2 O3 -Al2 O3 system is an important reaction to realize the resource treatment of solid waste, and research on the system reaction is of great significance
The peaks of Fe3 O4 gradually weakened from S1 to S4, the peaks of FeO became stronger, and the peaks of Al2 O3 became weaker in turn. These experimental results show that with the increase in the Fe2 O3 content, it was easier for FeO to be formed, and Al2 O3 appeared to be reduced to a certain extent
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Crystals 2021, 11, 1026 reduction of Fe2O3-Al2O3 to metal Fe, FeAl, or its intermetallic compounds It is one of the key links to obtaining the reduction mechanism of Fe2O3-Al2O3. Metal Fe, FeAl, or its intermetallic compounds It is one of the key links to obtaining the reduction of Fe2O3-Al2O3 to FeO-Al2O3 was studied by using molten salt reduction mechanism of Fe2 O3 -Al2 O3. The microstructure and phase composition of reduction of Fe2 O3 -Al2 O3 to FeO-Al2 O3 was studied by using molten salt the deoxygenated products were examined by using SEM and XRD. By examining the the influence law of the Fe2O3 content on the electrolysis process and the electrosynthesis changes in the composition and structure of the cathode during the electrolysis process, pathway of FeO-Al2O3 in molten salt were studied. The influence law of the Fe2 O3 content on the electrolysis process and the electrosynthesis pathway of FeO-Al2 O3 in molten salt were studied
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