Selected coals are used to manufacture coke; the high pure carbon content, porous structure, and high resistance to crushing of coke have made it a necessary material in the production of molten iron (or hot metal, in iron/steel industry parlance). Coke also serves as a fuel in blast furnaces, as well as serving several nonfuel functions. In a typical blast furnace, iron ore, coke, and other materials, including sinter and fluxes, are loaded in layers. Air, preheated to 9001C, is blasted through the bottom of the furnace through nozzles called tuyeres. Oxygen in the air reacts with coke to form carbon monoxide and generate heat. (more…)
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