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:
May. 19, 2015
Filed:
Sep. 11, 2008
Applicants:
Tetsuharu Ibaraki, Tokyo, JP;
Hiroshi Oda, Tokyo, JP;
Inventors:
Tetsuharu Ibaraki, Tokyo, JP;
Hiroshi Oda, Tokyo, JP;
Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21B 5/00 (2006.01); C21B 11/06 (2006.01); C22B 5/10 (2006.01); C21B 13/00 (2006.01); C21B 13/10 (2006.01); C22B 1/245 (2006.01);
U.S. Cl.
CPC ...
C22B 5/10 (2013.01); C21B 13/0046 (2013.01); C21B 13/105 (2013.01); C22B 1/245 (2013.01);
Abstract
In a method for producing a reduced iron pellet, when a powder formed article including iron oxide and carbon is heated and reduced in a rotary hearth furnace, a formed article produced using a raw material, in which an average diameter of the iron oxide is 50 microns or less and a ratio of carbon monoxide to carbon dioxide in a reduction zone is from 0.3 to 1, is reduced at a temperature of 1400° C. or less, thereby producing a reduced iron pellet in which a metallization ratio of iron is 50 to 85% and a ratio of residual carbon is 2% or less.