How is Temperature Controlled in Blast Furnace Steel Production?

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[SOLVED] Blast furnace and oxygen converter

FACT: Scrap metal is added to the basic oxygen converter to control temperature in the production of steel from pig iron.

QUESTION: How can one control the temperature in the production of pig iron in the blast furnace? Scrap metal or something?
 
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In the simplest method, why do they call it a blast furnace?