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In order to study the process of Fe 3 O 4  reduction by melt electro-deoxidation. Electrochemical method was used to analyze the reduction mechanism of Fe 3 O 4  in NaCl-CaCl 2  melts. The effects of cell voltage and time on the product were discussed through constant cell voltage electrolysis. The results showed: (1) The reduction of solid Fe 3 O 4  to metallic Fe is a two-step process for obtaining electrons. (2) The transformation process (600 min, 0–1.0 V) of the electrolysis products with the increase of the cell voltage is as follows: Fe 3 O 4  → FeO → FeO + Fe → Fe. (3) The intermediate product Ca 2 Fe 2 O 5  was formed (2.0 V, 10–300 min), which inhibited the deoxygenation process in the early stage of the reaction. When the electrolysis time exceeds 60 min, the main reaction is the reduction of Ca 2 Fe 2 O 5  to Fe.

The electrochemical reduction mechanism of Fe 3 O 4 in NaCl-CaCl 2 melts