Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1990-04-02
1991-12-03
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75500, 75501, 266144, 266162, 266186, 266160, C21B 1108
Patent
active
050697153
ABSTRACT:
The present invention relates to an overall direct smelting process which provides for separating the carburization function from the heating function to permit separate control of the individual functions. One embodiment of the smelting reactor is divided into a carburization/smelting section and a heating section with a substantial recirculation of the molten product from the heating section back to the carburization/smelting section. The heating section also serves as a slag/metal separation section. Carburization is achieved by injection of solids (fine coal mixed with slagging agents), where desired. Gas generating solids or inert gases are injected into a lift pipe to provide a motive force for circulation of the molten metal. The circulation rate through the system is a function of the injected solid composition, the mass flow rate of the solids injected into the lift pipe and the lift pipe geometry. The liquid is discharged from the carburization/smelting chamber into a heating chamber where the pressure is preferably lower than in the carburization/smelting chamber, and where submerged combustion occurs in the slag. Weirs are provided for slag removal and discharge of the finished metal and a recirculation passageway or tube is provided to feed a substantial portion of the heated metal back into the carburization/smelting chamber. A compact high efficiency direct smelting process is thus achieved.
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N. A. Warner, Coal Based Ironmaking Via Melt Circulations, in Metallurgical Processes for the Year 2000 and Beyond, The Minerals, Metals & Materials Society, 1988, pp. 669-719.
Innes, J. A. et al., (Direct Smelting of Iron Ore in a Liquid Iron Bath--The HISmelt Process), 1988 Process Technology Conference Proceedings, pp. 225-231.
Andrews Melvyn J.
Regents of the University of Minnesota
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