MONITORING METHOD FOR SLAG FORMATION IN REFINING FURNACE

PURPOSE:To monitor the slag forming conditions in a converter by detection of the level and density of molten slag in steel making and refining with the converter by blowing an inert gas through gas blowing ports provided in the positions upper than the level of molten steel and measuring the flow rate and back pressure of the gas. CONSTITUTION:Gas blowing ports 5, 6 consisting of porous bricks are installed above the level of the molten steel 2 in a converter 1. An inert gas such as Ar having no influence upon a refining effect is blown through the ports 5, 6 with air feed pipes 10, 20 provided with flowmeters 11, 21, flow regulating valves 12, 22 and pressure gags 14, 24. The back pressure values measured with the gauges 14, 24 when the flow rate of the gaseous Ar is kept constant are inputted to an arithmetic circuit 7, which detects the level and density of the molten slag 3 in the coverter. It is possible to control the slag formation precisely in the converter operation in accordance with the detected values.