SLAG COATING METHOD FOR PROTECTING LINING REFRACTORIES OF FURNACE WALL IN TORPEDO LADLE CAR

摘要

PURPOSE: A slag coating method for protecting lining refractories of furnace wall in torpedo ladle car is provided to lengthen the life span of the furnace wall lining refractories of the torpedo ladle car by coating a molten mixture of residual slag and magnesia material on the operating surface of the furnace wall lining refractories of the torpedo ladle car. CONSTITUTION: In a method for protecting furnace wall lining refractories(12) made of alumina-silicon carbide-carbon material of torpedo ladle car(10) for pretreating and transporting molten iron, the slag coating method for protecting lining refractories of furnace wall in torpedo ladle car comprises the processes of discharging the pretreated molten iron from the torpedo ladle car; injecting 2 to 5 wt.% of magnesia material for the residual slag weight into slag remained in the torpedo ladle car, and maintaining the magnesia material together with the residual slag in the torpedo ladle car for 10 to 20 minutes so that the magnesia material is melted into the residual slag in the torpedo ladle car; and tilting the torpedo ladle car using a torpedo ladle car tilting apparatus(13) so that slag coating layer(3) is formed by coating slag on the operating surface of the furnace wall lining refractories, wherein the magnesia material is a material selected from the group consisting of sintered seawater magnesia clinker, natural sintered magnesia clinker, crushed materials of firebricks made of magnesia-carbon of waste refractories generated from steelmaking, and waste of spray material made of magnesia.