| 摘要 |
A molten iron pre-treatment method for performing desiliconization and dephosphorization of molten iron using a single converter-type refining furnace by supplying an oxygen source to the molten iron in the converter-type refining furnace to desiliconize same, then discharging some of the slag present in the furnace while retaining the molten iron inside the furnace, and subsequently supplying a CaO solvent and an oxygen source into the converter-type refining furnace and tapping the dephosphorized molten iron from the converter-type refining furnace. By analyzing the concentration of at least one carbon atom-containing gaseous species in suctioned gas drawn using an exhaust gas treatment device of the converter-type refining furnace during the desiliconization and determining the desiliconization completion time point on the basis of said analysis value, the subsequent dephosphorization process can be performed at low cost while limiting decreases in molten iron temperature. |
