| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for restraining erosion of a refractory in a converter and also, efficiently removing the stuck metal in the converter, in preliminary dephosphorization for hot metal in which powdery refining agent consisting essentially of CaO such as lime, is blown into the hot metal together with oxygen by using the converter. SOLUTION: The method for removing the stuck metal in the converter is characterized in that in the hot metal preliminary dephosphorization blowing, where after charging the hot metal into the converter-type refining furnace, a top-blowing lance having a nozzle for melting the metal installed on the sidewall is inserted into the refining furnace and the dephosphorization is performed by blowing the powdery refining agent together with the oxygen for blow-refining, from a nozzle for blow-refining installed at the tip-end of the top-blowing lance, the oxygen for melting the stuck metal is injected in the horizontal direction from the nozzle for melting the stuck metal installed on the sidewall during blowing period of the powdery refining agent, and from end of blowing of the powdery refining agent till end of blowing of the oxygen for blow-refining, purge-gas is continuously caused to flow from the nozzle for melting the stuck metal so that the nozzle for melting the stuck metal installed on the sidewall is not closed. COPYRIGHT: (C)2011,JPO&INPIT |
