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System and method for making metallic iron with reduced CO.sub.2 emissions

United States Patent

October 14, 2014
View the Complete Patent at the US Patent & Trademark Office
A method and system for making metallic iron nodules with reduced CO.sub.2 emissions is disclosed. The method includes: assembling a linear hearth furnace having entry and exit portions, at least a conversion zone and a fusion zone, and a moving hearth adapted to move reducible iron bearing material through the furnace on contiguous hearth sections; assembling a shrouded return substantially free of air ingress extending adjacent at least the conversion and fusion zones of the furnace through which hearth sections can move from adjacent the exit portion to adjacent the entry portion of the furnace; transferring the hearth sections from the furnace to the shrouded return adjacent the exit portion; reducing reducible material in the linear hearth furnace to metallic iron nodules; and transporting gases from at least the fusion zone to the shrouded return to heat the hearth sections while in the shrouded return.
Kiesel; Richard F. (Hibbing, MN), Englund; David J. (Bovey, MN), Schlichting; Mark (Crawfordsville, IN), Meehan; John (Conway, AR), Crouch; Jeremiah (Conway, AR), Wilson; Logan (Hot Springs, AR)
Nu-Iron Technology, LLC (Charlotte, NC)
13/ 499,021
September 28, 2010
GOVERNMENT INTERESTS The present invention was made with support by the Department of Energy, Sponsor Award DE-FG36-05GO15185. The United States government has certain rights in the invention.