Invention Grant
- Patent Title: Process for producing reduced iron pellets, and process for producing pig iron
- Patent Title (中): 生产还原铁丸的方法和生铁生产方法
-
Application No.: US12673141Application Date: 2008-09-11
-
Publication No.: US09034074B2Publication Date: 2015-05-19
- Inventor: Tetsuharu Ibaraki , Hiroshi Oda
- Applicant: Tetsuharu Ibaraki , Hiroshi Oda
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPP2007-239058 20070914; JPP2008-227163 20080904
- International Application: PCT/JP2008/066458 WO 20080911
- International Announcement: WO2009/035053 WO 20090319
- Main IPC: C21B5/00
- IPC: C21B5/00 ; C21B11/06 ; C22B5/10 ; C21B13/00 ; C21B13/10 ; C22B1/245

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.
Public/Granted literature
- US20110023657A1 PROCESS FOR PRODUCING REDUCED IRON PELLETS, AND PROCESS FOR PRODUCING PIG IRON Public/Granted day:2011-02-03
Information query