Abstract:The molten salt electrolysis method for extracting iron has some advantages such as high production efficiency and green environmental protection. It is a potential method for extracting iron in future. This paper selects CaCl2-NaCl-Fe2O3 as the electrolyte system, and cyclic voltammetry (CV) and other testing techniques were used to study the electrochemical behavior of Fe (III) on an inert tungsten electrode. The number of transferred electrons, diffusion coefficient, and nucleation mode of Fe (III) were discussed. The results show that the electrochemical reduction process of Fe (III) ions is a two-step reduction at a temperature of 993 K. The reaction equations were Fe (III)+e-=Fe (II) and Fe (II)+2e-=Fe (0), respectively. The electrochemical reduction process of iron ions on tungsten electrodes is diffusion controlled, and the diffusion coefficient is 1.443×10-6 cm2·s-1. The electro crystallization mode of Fe (III) on tungsten electrode is instantaneous nucleation.