| 摘要 |
PURPOSE:To execute heat conduction to molten iron at high efficiency and to execute smelting reduction of iron raw material in the molten iron by blowing gas for stirring from nozzles at bottom wall into the molten iron in a horizontal type refining furnace and also oxygen from lances at top part and the oxygen into slag layer from nozzle holes at lower part side wall of the lance. CONSTITUTION:Nitrogen gas is blown into the molten iron 7 from plural pieces of the nozzles 9 at the bottom wall in the horizontal refining furnace 5 to execute stirring, and the oxygen for decarbonizing is blown into the molten iron from the lower ends of plural pieces of the lances 6 at top part. By this method, decarbonizing reaction is executed in the molten iron 7 with coal supplied from a supplying tube 10 to generate CO. At the same time, the oxygen for secondary combustion is blown into the slag layer 8 from plural nozzle holes at each lower part side wall of the lance 6 to execute secondary combustion of the CO gas, which is generated in the molten iron 7, in the slag layer 8. The heat generated with the secondary combustion is conducted from the slag layer 8 into the molten iron 7, to raise the molten iron 7 temp. By this method, the smelting reduction is executed to the iron ore continuously supplied from the supplying tube 10 at good efficiency in the molten iron 7. |
