Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-01-05
1994-11-22
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
266225, C22B 1500
Patent
active
053665376
ABSTRACT:
A furnace 10 for smelting iron ore and/or refining molten iron 20 is equipped with an overhead pneumatic lance 40, through which a center stream of particulate coal 53 is ejected at high velocity into a slag layer 30. An annular stream of nitrogen or argon 51 enshrouds the coal stream. Oxygen 52 is simultaneously ejected in an annular stream encircling the inert gas stream 51. The interposition of the inert gas stream between the coal and oxygen streams prevents the volatile matter in the coal from combusting before it reaches the slag layer. Heat of combustion is thus more efficiently delivered to the slag, where it is needed to sustain the desired reactions occurring there. A second stream of lower velocity oxygen can be delivered through an outermost annulus 84 to react with carbon monoxide gas rising from slag layer 30, thereby adding still more heat to the furnace.
REFERENCES:
patent: 2991173 (1961-07-01), Trentini
patent: 4434005 (1984-02-01), Metz
patent: 4533124 (1985-08-01), Mercatoris
patent: 4639269 (1987-01-01), Hilbrans
Rosenberg Peter D.
Steel Technology Corporation
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