"Blast furnaces do not need fuel to create iron" Blast furnaces need fuel to raise the temperature of the blast furnace input to speed up stripping what become

"Blast furnaces do not need fuel to create iron" Blast furnaces need fuel to raise the temperature of the blast furnace input to speed up stripping what becomes slag and the oxygen from the iron oxide in the iron ore. Carbon monoxide is what is able to penetrate the iron ore at the high temperatures. My previous comment is criticizing the author for suggesting that yet another fuel produces the heat for the blast furnace.