Title:
METHOD FOR PRODUCING REDUCED IRON
Document Type and Number:
WIPO Patent Application WO/2021/241272
Kind Code:
A1
Abstract:
This method for producing reduced iron by reducing iron oxide charged into a shaft furnace comprises: blowing a heated mixed gas that includes nitrogen gas and a reducing gas containing 90 vol% or more of hydrogen gas into a shaft furnace from a tuyere provided in the lower part of a reduction zone of the shaft furnace, while blowing at least some of the reducing gas at normal temperature into a reduced-iron cooling zone provided in the lower part of the shaft furnace; and using the reducing gas ascending through the cooling zone to reduce iron oxide.
Inventors:
INADA TAKANOBU (JP)
MIZUTANI MORITOSHI (JP)
UJISAWA YUTAKA (JP)
YASUDA NAOTO (JP)
FUNAGANE HITOSHI (JP)
MIZUTANI MORITOSHI (JP)
UJISAWA YUTAKA (JP)
YASUDA NAOTO (JP)
FUNAGANE HITOSHI (JP)
Application Number:
PCT/JP2021/018391
Publication Date:
December 02, 2021
Filing Date:
May 14, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21B13/02; F27D17/00
Domestic Patent References:
WO2019238720A1 | 2019-12-19 |
Foreign References:
JPS4947208A | 1974-05-07 | |||
US4363654A | 1982-12-14 | |||
CN101787406A | 2010-07-28 | |||
KR20120075201A | 2012-07-06 | |||
JP2020093139A | 2020-06-18 | |||
JP2010046055A | 2010-03-04 | |||
CN105219907A | 2016-01-06 | |||
JP2013216929A | 2013-10-24 |
Other References:
S. HOSOKAIY. KASHIWAYAK. MATSUIN. OKINAKAT. AKIYAMA, ENVIRON. SCI. TECHNOL., vol. 45, 2011, pages 821 - 826
HARA, TETSU-TO-HAGANE, vol. 62, 1976, pages 315
YAMAOKA ET AL., TETSU-TO-HAGANE, vol. 74, 1988, pages 2254
See also references of EP 4159879A4
HARA, TETSU-TO-HAGANE, vol. 62, 1976, pages 315
YAMAOKA ET AL., TETSU-TO-HAGANE, vol. 74, 1988, pages 2254
See also references of EP 4159879A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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