Method for improving nitrogen capacity of top slag of oriented silicon steel and used slag

The invention discloses a method for improving nitrogen capacity of oriented silicon steel top slag and used slag charge, and belongs to the technical field of metallurgy, according to the slag charge for improving the nitrogen capacity of the oriented silicon steel top slag, after the last batch of alloy material is added after oriented silicon steel converter tapping, the slag charge is added to the surface of the top slag, and the slag charge mainly comprises bauxite. The slag charge is added on the surface of the molten steel, so that part of the molten steel can be isolated from air, and permeation of nitrogen and oxygen in the steel in the transfer process of the steel ladle is slowed down. According to the method, the content of acid-soluble aluminum (Als) and [N] of the oriented silicon steel can be effectively and stably controlled, it is guaranteed that an enough amount of AlN inhibitor is stably formed in the steel in the heat treatment process, a primary recrystallization structure is controlled t