| 摘要 |
PURPOSE:To improve carburization, siliconization and de-sulfurization and to economically produce molten iron having good quality by blasting suitably adjusted blast temp. and oxygen concentration into a cylindrical type furnace and burning CO and H2 in the furnace gas by blowing combustible gas. CONSTITUTION:Ferrous raw material 8, coke 9, slag making agent 10, etc., are charged from furnace top raw material charging hole 1 in the cylindrical furnace. Next, the above coke 9 is burnt by blasting air 11 from tuyeres 4, to generate high temp. gas and the ferrous raw material 8 is melted by this sensible heat. The molten iron 12 and molten slag 13 thus produced are discharged from iron and slag tapping holes 5, 6 at the lower part of the furnace and the generated gas is recovered from a gas recovery hole 2 at the upper part of the furnace. In this above iron-making process, assuming that CO2/(CO2+ CO) and H2O/(H2O+H2) is gas generated by combustion of the coke 9 both become zero, the blast temp. and the oxygen concentration are adjusted to blast, so that the blast temp. rises to >=2,000 deg.C. Further, the combustible gas 14 is blown from a blowing holes 7 in the furnace side wall part 3 at the upper part of tuyeres 4, to burn CO and H2 in the furnace gas, and the charging materials are heated by the sensible heat.
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