A blast furnace is a large industrial structure used for smelting metal ores, particularly iron ore, to produce molten iron, which is then used to create steel and other iron products. The process involves the reduction of iron ore using carbon, typically in the form of coke, and involves several key components and processes: 1. **Structure**: A blast furnace is typically a tall, cylindrical structure lined with heat-resistant bricks. It is designed to withstand high temperatures and contain the molten materials.
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A blast furnace is a shaft furnace in which a descending solid charge encounters rising hot gases. In iron extraction, the charge includes iron ore, coke and a flux such as limestone. The products include molten pig iron and slag, which separates from the metallic liquid.[ref]
Steel Production by the American Iron and Steel Institute. How Steel Is Made: blast-furnace feed and pig-iron output
The gases supply both heat and a reducing environment. A simplified iron oxide reduction isHere carbon monoxide removes oxygen from the iron oxide and becomes carbon dioxide. The opposing flows allow rising gases to heat and react with incoming material before leaving the furnace: countercurrent flow helps recover energy within the process. The pig iron contains substantial carbon and requires further refining for most steelmaking.