Method for removing nickel-based superalloy return scrap impurity elements through electron beam melting

The invention relates to a method for removing impurity elements in nickel-based superalloy return scraps through electron beam melting, and belongs to the technical field of alloy melting. The method is characterized in that a crucible-free smelting mode is adopted, high-energy electron beams are used for bombarding the high-temperature alloy return scraps, parameters such as the actual ingot pulling speed and the feeding speed are set according to the change of the smelting power by controlling the vacuum degree of a furnace chamber and regulating and controlling the electron beam smelting power, and the return scrap alloy ingots are subjected to drop melting; molten liquid drops into an upper molten pool of a refined mother alloy base with the same components, the mother alloy base is pulled down and rotates, the lower portion of the mother alloy base serves as a condensation crystallizer, a crucible-free molten pool is formed in the upper portion of the base, forced convection is generated in rotating liq