FIELD: metallurgy. SUBSTANCE: apparatus has block of nozzles provided for being mounted in wall of capacity. In the case block of nozzles has at least one canal closed in its beginning and pipe for blowing in moved in canal and pushed forward to open canal for blowing in beginning. Adjacent to corresponding discharging ends of pipe and canal mean to block molten bath is located to block molten bath to limit reverse flow of molten bath in space between pipe of tuyere and canal, as pipe is moving into position of blowing in. In the case blocking mean forms clearance, that allows pipe moving forward and the clearance is so small, that prevents significant smelt metal flow through it. In case molten bath is not stopped by the blocking mean, there is impermeable for the molten bath tightening sealing mean located adjacent to outer end of pipe. EFFECT: improved production process. 4 cl, 3 dwg
