Jisho

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こうろ 高炉
Common word Wanikani level 43 Play audio Links
Noun
1. blast furnace​
Wikipedia definition
2. Blast furnace​A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally iron. In a blast furnace, fuel, ore, and flux (limestone) are continuously supplied through the top of the furnace, while air (sometimes with oxygen enrichment) is blown into the bottom of the chamber, so that the chemical reactions take place throughout the furnace as the material moves downward.
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