Method for preparing Dy-Fe alloy through oxide molten salt electrolysis

The invention discloses a method for preparing a Dy-Fe alloy by electrolyzing an oxide molten salt. The method comprises the following steps of: adding a mixture of Dy2O3 and Fe2O3 into a fluoride molten salt electrolyte system; and electrolyzing to prepare the Dy-Fe alloy. In the invention, a tungsten rod is utilized as a cathode, and element Fe is obtained from electrolyzing ferric oxide, thus the distribution of Dy and Fe in the produced Dy-Fe alloy is strong in controllability, and the error is less than 1%. As a high-density cathode current is utilized, during the electrolysis production process, the slagging amount is greatly reduced, the yield is improved, and the production cost is reduced; no self-consumption ferric cathode is utilized, thereby reducing the labor intensity of frequently replacing the ferric cathode; and a 10000A-30000A large-scale electrolysis stove can be used for production, thereby greatly improving alloy consistency.