| 摘要 |
PURPOSE:To utilize heat energy in exhausted gas and reduce iron ore with good productivity, by preheating powdery iron ore with high temp. exhausted gas in converter at charging iron ore, cokes to metallurgical furnace such as converter, supplying oxygen by oxygen top blown lance to reduce and melt iron ore and manufacture pig iron. CONSTITUTION:Molten pig iron is charged into a top blown converter 1 providing bottom blowing tuyere, oxygen is blown from bottom blowing tuyere and a top blowing lance 7, then lump cokes are thrown into furnace from a converter hole 2 to raise temp. of molten pig iron to about 1,520 deg.C by the combustion. Next, iron ore fines of <=200 mesh are passed from an iron ore dispenser 6 through a piping 5 for pneumatically carrying powdery granule of an exhausted gas duct 4, heated with high temp. exhausted gas, the blown from the lance 7 and reduced to molten pig iron by cokes. Since ore fines are heated to high temp., supplying velocity to converter can be enlarged, and molten pig iron can be manufactured from iron ore with superior productivity while utilizing heat energy in exhausted gas.
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