Blast Furnace
Blast
furnace A furnace used for the primary reduction of iron ore to iron. Ore,
coke, and limestone (which acts as a flux to remove silica) are loaded into the
top of a tall furnace lined with mineral heat-resisting substances (such as
fire-clay), in which the combustion of the coke is intensified by a pre-heated
blast of air. At a certain temperature the iron ore is reduced to iron, which
runs to the bottom of the furnace, where it is either tapped off and solidified
as pig-iron, or conveyed while still molten to other plant for steel-making.
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