[TheForge] Blast furnace (Was: microwave heavy metal session)

Sat Feb 14 07:39:01 2004

In a message dated 2/13/2004 1:39:35 AM Eastern Standard Time, 
[email protected] writes:

> I don't know how widespread this trick is.  Or was, considering the
> shift to electric arc mini-mills.  But I saw a rig that used it in
> Sydney, NS in the 70s.
> 

To All,
O2 lances have been around for a long time.  They were used even in the open 
hearth process to drive the carbon down so it could be readjusted in the 
ladle.  In BOF's the O2 is injected at such a high rate that the lance never 
touches the melt.  It is also half  water cooled and half cooled by the flow of the 
O2.  EF's have taken over the US market because BOF's are the steel making 
furnaces of fully integrated mills where molten pig iron is available.  Mini 
mills use 100% cold scrap and EF's are the only way to go.  The tonnage from the 
mini mills is now higher.

Hochewa
Born and raised in Bethlehem, PA 

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