DEVICE FOR BLOWING REFINING AGENT TO VESSEL FOR MOLTEN METAL

摘要

PURPOSE:To permit easy removal of a sleeve body having a blow hole by providing an inside tuyere and the sleeve body inserted therein to the bottom of a vessel for molten metal and packing non-sinterable refractories into the space part between the inside tuyere and the sleeve body. CONSTITUTION:An inside tuyere 3 is provided to the bottom of a ladle and a sleeve body 4 having a blow hole 5 is inserted therein. Non-sinterable refractories 6 are packed into the space part between the tuyere 3 and the body 4. A hardly sinterable refractory packing 13 is inserted to the top end face of the hole 5 to avoid inflow of a molten steel and the molten steel is tapped into the ladle. A sliding plate 8 is slided to match a blow introducing hole 11a and the hole 5 through which an inert gas is blown to blow off the packing 13 and thereafter a refining agent is blown. When the introduction of the blowing gas is stopped upon completion of the blowing of the refining agent, the molten steel enters the hole 5 and closes the hole by solidifying but the refractories 6 are packed between the body 4 and the tuyere 3 and therefore the body 4 is easily removable for exchange and is restorable.