| As the most used metal,steel is widely used in the field of structural materials.The industrially obtained metallic iron is mainly the method of reducing iron carbon at high temperature.FFC method is applied to deoxidize metal simple substance,which has the advantages of short process and ultra-low emissions.The FFC method is used to prepare metallic iron,and the electrochemical behavior is analyzed.The results are as follows:The theory of molten salt electrochemistry was used to research the thermodynamic and dynamics(Na Cl:Ca Cl2at a molar ratio of 0.48:0.52).The metallic cavity electrode(MCE)loaded with Fe2O3/Fe3O4 and Fe2O3/Fe3O4 coated electrode(FCE)were respectively used as working electrodes.Analysis results show that the reduction process of Fe2O3/Fe3O4 is performed step by step.The reduction sequence is:Fe2O3?Fe3O4?Fe O?Fe.The sintering results of Fe2O3 show that the crystal form transformation of?Fe2O3 to?Fe2O3 occurs at 800?1100?,and the open porosity decreases with increasing temperature;Constant voltage electrolysis of Fe2O3 were performed at different cell voltages in Na Cl-Ca Cl2 melt at 800?.It was found that the reduction process of iron oxides is performed step by step with the cell voltage increasing at sufficient reaction time.The corresponding process is:Fe2O3?Fe3O4?FexO?Fe O?Fe.The relationship between the reduction products and the electrolysis time was studied,and it was found that calcium ferrite is formed at 0.5 V and 30 min.As the voltage increases,the calcium ferrite formed has an effect on the morphology of the product.According to the analysis of I-t curves of deoxidation processes at different cell voltage,the increase of the cell voltage affects the energy consumption.Metal iron can be obtained by electrolysis for 5 h at a constant cell voltage of 1.3 V when adding 20%porogen of NH4HCO3.The electrolytic efficiency reaches 95.8%and the electrolytic energy consumption is 2.88 k W·h·kg-1.Figure 63;Table 13;Reference 84... |
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