In the blast furnace production, iron ore, coke, and slag-forming flux (limestone) are charged from the top of the furnace, and preheated air is blown from the tuyere located at the lower portion of the furnace along the circumference of the furnace. At high temperature, carbon in the coke (some blast furnaces also spray auxiliary fuel such as pulverized coal, heavy oil, natural gas, etc.) and carbon monoxide generated by the combustion of oxygen in the air, remove oxygen in the iron ore during the furnace rise. Thereby reducing the iron. The molten iron is discharged from the iron mouth. The impurities which are not reduced in the iron ore are combined with a flux such as limestone to form slag, which is discharged from the slag port. The generated gas is led out from the top of the furnace, and after being dusted, it is used as a fuel for a hot air furnace, a heating furnace, a coke oven, a boiler, and the like.
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Brief Analysis of Specific Conditions of Blast Furnace Ironmaking