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blast furnace
a towerlike smelting furnace for separating metal, esp. iron, from the impurities in the ore: a blast of air is forced into the furnace from below to produce the intense heat needed
See blast furnace in American Heritage Dictionary 4
noun
A furnace in which combustion is intensified by a blast of air, especially a furnace for smelting iron by blowing air through a hot mixture of ore, coke, and flux.
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blast furnace
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