blast furnace

noun
a large vertical furnace for smelting iron from ore, using coke as fuel: designed so as to direct a continuous blast of air through the fuel in order to obtain a high rate of combustion.

Origin:
1700–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blast furnace
 
n
a vertical cylindrical furnace for smelting iron, copper, lead, and tin ores. The ore, scrap, solid fuel, and slag-forming materials are fed through the top and a blast of preheated air is forced through the charge from the bottom. Metal and slag are run off from the base

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Along with exhibits on forge history in the old blast furnace, an interpretive path guides you around the site.
Coke and iron, the raw materials, were combined in a blast furnace to make liquid pig iron.
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