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EP1457574A4 - PROCESS FOR PRE-TREATMENT OF MELT-LIQUID IRON AND FINE-PROCESSING - Google Patents

PROCESS FOR PRE-TREATMENT OF MELT-LIQUID IRON AND FINE-PROCESSING

Info

Publication number
EP1457574A4
EP1457574A4 EP02772944A EP02772944A EP1457574A4 EP 1457574 A4 EP1457574 A4 EP 1457574A4 EP 02772944 A EP02772944 A EP 02772944A EP 02772944 A EP02772944 A EP 02772944A EP 1457574 A4 EP1457574 A4 EP 1457574A4
Authority
EP
European Patent Office
Prior art keywords
molten iron
carbon source
injection
flux
refining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02772944A
Other languages
German (de)
French (fr)
Other versions
EP1457574B1 (en
EP1457574A1 (en
Inventor
Hiroshi Hirata
Hiromi Ishii
Hiroaki Hayashi
Yuji Ogawa
Naoto Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP1457574A1 publication Critical patent/EP1457574A1/en
Publication of EP1457574A4 publication Critical patent/EP1457574A4/en
Application granted granted Critical
Publication of EP1457574B1 publication Critical patent/EP1457574B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention provides a pretreatment method and a refining method of molten iron, the methods allowing the refining to not use fluorite in both the processes of molten iron pretreatment and decarburization, minimizing the formation of slag for dephosphorization in the decarburization process, and increasing heat margin by adding a carbon source to the molten iron with great efficiency. <??>The present invention is, in a molten iron pretreatment method wherein molten iron is desiliconized and dephosphorized by using a refining vessel capable of top and bottom blowing and injecting a flux mainly composed of a component consisting of one or more of burnt lime, limestone and iron oxide, the component containing at least iron oxide, into the molten iron, characterized by: injecting a carbon source into the molten iron during desiliconizing reaction and starting the carbon source injection prior to the commencement of said flux injection; preferably starting said flux injection after an ÄSiÜ concentration is lowered to 0.15 mass %; and still more preferably starting said flux injection after the completion of the carbon source injection. <IMAGE>
EP02772944.1A 2001-09-27 2002-09-27 Method for pretreatment of molten iron and method for refining Expired - Lifetime EP1457574B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001295874A JP3854482B2 (en) 2001-09-27 2001-09-27 Hot metal pretreatment method and refining method
JP2001295874 2001-09-27
PCT/JP2002/010108 WO2003029498A1 (en) 2001-09-27 2002-09-27 Method for pretreatment of molten iron and method for refining

Publications (3)

Publication Number Publication Date
EP1457574A1 EP1457574A1 (en) 2004-09-15
EP1457574A4 true EP1457574A4 (en) 2006-02-15
EP1457574B1 EP1457574B1 (en) 2018-05-30

Family

ID=19117229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02772944.1A Expired - Lifetime EP1457574B1 (en) 2001-09-27 2002-09-27 Method for pretreatment of molten iron and method for refining

Country Status (4)

Country Link
EP (1) EP1457574B1 (en)
JP (1) JP3854482B2 (en)
KR (1) KR100658807B1 (en)
WO (1) WO2003029498A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100909691B1 (en) * 2002-12-18 2009-07-29 주식회사 포스코 Molten steel delineation method using high purity iron oxide in vacuum degassing facility
JP4735169B2 (en) * 2005-09-30 2011-07-27 Ｊｆｅスチール株式会社 Hot metal dephosphorization method
JP5689024B2 (en) * 2010-06-07 2015-03-25 株式会社神戸製鋼所 Dephosphorization method of hot metal using dust
US9493854B2 (en) 2011-12-20 2016-11-15 Jfe Steel Corporation Converter steelmaking method
JP5979017B2 (en) * 2012-01-19 2016-08-24 Ｊｆｅスチール株式会社 Hot metal refining method
CN115574554A (en) * 2022-09-27 2023-01-06 首钢集团有限公司 Lime powder drying device, converter and lime powder injection method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170409A (en) * 1986-01-21 1987-07-27 Kobe Steel Ltd Preliminary treatment of molten iron
EP0714989A1 (en) * 1993-06-30 1996-06-05 Nippon Steel Corporation Steel manufacturing method using converter
JPH0920914A (en) * 1995-06-30 1997-01-21 Nippon Steel Corp Hot metal pretreatment method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221511A (en) * 1984-04-17 1985-11-06 Nippon Steel Corp Method for carburizing and melt-refining molten iron
JPH02228412A (en) * 1989-02-28 1990-09-11 Kobe Steel Ltd Pretreatment of molten iron
JPH07278636A (en) * 1994-04-13 1995-10-24 Nippon Steel Corp Hot metal desiliconization method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170409A (en) * 1986-01-21 1987-07-27 Kobe Steel Ltd Preliminary treatment of molten iron
EP0714989A1 (en) * 1993-06-30 1996-06-05 Nippon Steel Corporation Steel manufacturing method using converter
JPH0920914A (en) * 1995-06-30 1997-01-21 Nippon Steel Corp Hot metal pretreatment method

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
KISHIDA T ET AL: "CONSTRUCTION AND OPERATION OF HOT METAL DEPHOSPHORIZATION PLANT AT THE WAKAYAMA STEEL WORKS", SUMITOMO SEARCH, SUMITOMO METAL INDUSTRIES, TOKYO, JP, vol. 33, November 1986 (1986-11-01), pages 9 - 15, XP009010700, ISSN: 0585-9131 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 015 (C - 469) 16 January 1988 (1988-01-16) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 05 30 May 1997 (1997-05-30) *
See also references of WO03029498A1 *

Also Published As

Publication number Publication date
KR100658807B1 (en) 2006-12-19
EP1457574B1 (en) 2018-05-30
JP3854482B2 (en) 2006-12-06
JP2003105418A (en) 2003-04-09
WO2003029498A1 (en) 2003-04-10
EP1457574A1 (en) 2004-09-15
KR20040033326A (en) 2004-04-21

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