The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2011
Filed:
Sep. 29, 2009
Rodney L. Bleifuss, Grand Rapids, MN (US);
David J. Englund, Bovey, MN (US);
Iwao Iwasaki, Grand Rapids, MN (US);
Andrew J. Lindgren, Grand Rapids, MN (US);
Richard F. Kiesel, Hibbing, MN (US);
Rodney L. Bleifuss, Grand Rapids, MN (US);
David J. Englund, Bovey, MN (US);
Iwao Iwasaki, Grand Rapids, MN (US);
Andrew J. Lindgren, Grand Rapids, MN (US);
Richard F. Kiesel, Hibbing, MN (US);
Nu-Iron Technology, LLC, Charlotte, NC (US);
Abstract
A method for producing metallic iron nodules by assembling a shielding entry system to introduce coarse carbonaceous material greater than 6 mesh in to the furnace atmosphere at location(s) where the temperature of the furnace atmosphere adjacent at least partially reduced reducible iron bearing material is between about 2200 and 2650° F. (1200 and 1450° C.), the shielding entry system adapted to inhibit emission of infrared radiation from the furnace atmosphere and seal the furnace atmosphere from exterior atmosphere while introducing coarse carbonaceous material greater than 6 mesh into the furnace to be distributed over the at least partially reduced reducible iron bearing material, and heating the covered at least partially reduced reducible iron bearing material in a fusion atmosphere to assist in fusion and inhibit reoxidation of the reduced material during fusion to assist in fusion and inhibit reoxidation of the reduced material in forming metallic iron nodules.