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Method for reducing iron losses in an iron smelting process

United States Patent

5,885,322
March 23, 1999
View the Complete Patent at the US Patent & Trademark Office
A process of smelting iron that comprises the steps of: a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; b) maintaining conditions in said reactor to cause (i) at least some of the iron oxide to be chemically reduced, (ii) a bath of molten iron to be created and stirred in the bottom of the reactor, surmounted by a layer of slag, and (iii) carbon monoxide gas to rise through the slag; c) causing at least some of said carbon monoxide to react in the reactor with the incoming oxygen, thereby generating heat for reactions taking place in the reactor; and d) releasing from the reactor an offgas effluent, is run in a way that keeps iron losses in the offgas relatively low. After start-up of the process is complete, steps (a) and (b) are controlled so as to: e) keep the temperature of the molten iron at or below about 1550.degree. C. and f) keep the slag weight at or above about 0.8 tonne per square meter.
Sarma; Balu (Airmont, NY), Downing; Kenneth B. (Greenville, SC)
Steel Technology Corporation (Washington, DC)
08/ 823,012
March 21, 1997
The Government of the United States of America has rights in this invention pursuant to Cooperative Agreement No. DE-FC07-94ID13284 awarded by the U.S. Department of Energy.