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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: HPilot who wrote (463796)	3/14/2009 2:28:34 PM
From: combjelly	Respond to of 1588522

"And for a blast furnace you must burn coal or some other form of carbon, the carbon is needed to turn iron into steel." Not really. Coal, in the form of coke, is used as a reducing agent to smelt iron ore. And this is only a factor in primary steel production. Secondary steel production uses an arc furnace in a mini-mill. Which produce a significant fraction of US steel production. A blast furnace uses no coal or coke. The whole idea is to eliminate the carbon, not add more. Which is why oxygen is forced through the molten steel.