OPERATING METHOD FOR CONTROLLING STUCK SOLID METAL IN REFINING FURNACE

PROBLEM TO BE SOLVED: To provide a method for operating a refining furnace with which the productivity in a converter is ensured and the sticking state of solid metal is satisfactorily controlled without damaging the inner side wall refractory at the furnace hole part and in the furnace. SOLUTION: According to the distributing state of the solid metal stuck in the furnace, a blowing exclusive-using lance 5 or an attached lance 5' for solid metal-melting nozzle 7 are selected and either lance is alternately used by succeeding one or more heats. The distribution of the stuck solid metal is observed with the observation of eyes or a monitor-camera, and based on this observation, the present lance is changed into a prescribed lance. In the case of the heat using the attached lance with the solid metal-melting nozzle, oxygen is blown in the range of 3-10% oxygen for blow-refining, from the nozzle 7 for melting the solid metal till calmness to disturbance of gas flow in the furnace at the initial stage comes and in the middle stage except after measuring with a sub-lance at the end stage. At the initial stage and the end stage, the positive melting of the solid metal is not performed, and from the nozzle 7 for melting the solid metal, mainly purge gas is made to flow to prevent the clogging. The injecting direction of the oxygen for melting the solid metal is directed to 40-90° downward to the lance. COPYRIGHT: (C)2008,JPO&INPIT