Open hearth furnaces are first charged with scrap and a small amount of limestone. Limestone is used as a reduction agent. Then the fuel—typically oil, natural gas, coal, tar and pitch, or a combination of these—is ignited to melt the charge (Fig. 6).As the charge melts, proportioned amounts of molten pig iron are added to the furnace and high-purity oxygen is blown in.
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Learn More01/08/2006 · Coke and raw material (iron ore, pellet, sinter, quartz, dolomite, lime and coking coal) are weighed and charged into the furnaces from the top. The pressurized hot air within the furnace forces the mixture to be suspended in the air and the coke, with the energy that is released due to combustion, reaches an approximate temperature of 2700 °C, the melting point of the iron ore.
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