Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof

The invention discloses electro-slag remelting refining slag efficiently utilizing return slag, a preparing method and an application method thereof and belongs to the technical field of the electro-slag remelting refining slag. The electro-slag remelting refining slag is composed of, by mass percent, 50-80% of electro-slag remelting return slag, 16-35% of fluorite, 4-10% of alumina powder, and 0-5% of lime. According to the preparing method, the electro-slag remelting return slag, the fluorite, the alumina powder and the lime form new slag, the new slag is melted in a slugging furnace in advance after being mixed evenly, and then the liquid slag is crushed by adopting a wind quenching method. According to the application method, the electro-slag remelting refining slag prepared by utilizing the return slag is baked, then coke is adopted as an arc generating agent, metallic aluminum particles are mixed into the electro-slag remelting refining slag, and the slugging time is controlled to be 30 minutes. The remelting technological process of the electro-slag remelting refining slag is stable, the surface quality of steel ingots is good, chemical components are evenly distributed, the slag system cost is 460-942.5 yuan per ton, the cost is lowered by 55-78%, and the return slag is efficiently utilized.