Method for reducing inclusions in tundish molten steel and improving casting blank quality

The invention belongs to the technical field of metallurgy continuous casting, and relates to a method for reducing tundish molten steel inclusions and improving casting blank quality, in the casting process, a negative electric field is applied to a tundish covering agent, a positive electric field is applied to a submersed nozzle, and the inclusions in molten steel are eliminated to the maximum extent according to the principle that the inclusions move directionally under the action of the electric fields; the number of inclusions in the casting blank is reduced, and finally the purpose of improving the quality of the casting blank is achieved; a gradient material is placed in a tundish covering agent to serve as an electrode, and an electric field is applied to the tundish covering agent; the gradient material is connected with a conducting rod controlled by a mechanical arm and can fluctuate up and down along with the slag page; and the submersed nozzle is connected with the positive electrode of the powe