CA2519728A1 - Method for producing foamed slag on high-chromium melts in an electric furnace - Google Patents

Method for producing foamed slag on high-chromium melts in an electric furnace Download PDF

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Publication number
CA2519728A1
CA2519728A1 CA002519728A CA2519728A CA2519728A1 CA 2519728 A1 CA2519728 A1 CA 2519728A1 CA 002519728 A CA002519728 A CA 002519728A CA 2519728 A CA2519728 A CA 2519728A CA 2519728 A1 CA2519728 A1 CA 2519728A1
Authority
CA
Canada
Prior art keywords
slag
fact
accordance
preforms
density
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
CA002519728A
Other languages
French (fr)
Other versions
CA2519728C (en
Inventor
Lutz Rose
Johann Reichel
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.)
SMS Siemag AG
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2519728A1 publication Critical patent/CA2519728A1/en
Application granted granted Critical
Publication of CA2519728C publication Critical patent/CA2519728C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/54—Processes yielding slags of special composition
    • 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
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered 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
    • C21C2300/00—Process aspects
    • C21C2300/02—Foam creation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Analytical Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a method for producing foamed slag on high-chromium steel melts in an electric furnace, whereby a mixture consisting of a metal oxide and carbon is introduced into the furnace, the metal oxide in the slag is reduced by the carbon, and the gases created in the slag form bubbles which thus foam up the slag. In order to be able to control the gas formation and thus the foaming process, the mixture consisting of a metal oxide and carbon and optionally an iron carrier is introduced as preforms, such as pellets, which are compressed and/or provided with a binding agent. The gas formation can be controlled in terms of location, type and time, by adjusting the characteristics of the pellets, especially the density and/or compression characteristics thereof.

Claims (11)

1. Method for producing foamed slag (7) on high-chromium steel melts (6) in an electric arc furnace (1), wherein a mixture of a metal oxide and carbon is introduced into the furnace (1), the metal oxide is reduced by the carbon in the slag (7), and the resulting gases form bubbles in the slag, which thus cause the slag to foam, characterized by the fact that the mixture of metal oxide and carbon is introduced into the furnace as compressed preforms (8) and/or preforms (8) provided with a binder.
2. Method in accordance with Claim 1, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they float in the slag (7).
3. Method in accordance with Claim 1 or Claim 2, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they float in the slag near the phase boundary between the melt (6) and the slag (7).
4. Method in accordance with Claim 2 or Claim 3, characterized by the fact that the density of the preforms (8) is adjusted by the addition of an iron carrier.
5. Method in accordance with any of Claims 1 to 4, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they disintegrate in the slag (7) uniformly and slowly, and the evolution of gas occurs uniformly and over a relatively long period of time.
6. Method in accordance with any of Claims 1 to 5, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they disintegrate with a time delay.
7. Method in accordance with any of Claims 1 to 6, characterized by the fact that a flux, preferably limestone, is additionally added to the mixture.
8. Method in accordance with any of Claims 1 to 7, characterized by the fact that a slag thinner, preferably CaF2, is additionally added to the mixture.
9. Method in accordance with any of Claims 1 to 8, characterized by the fact that a reducing agent, preferably silicon and/or aluminum, is additionally added to the mixture.
10. Method in accordance with any of Claims 1 to 9, characterized by the fact that the preforms (8) are introduced through the sidewalls (10) and/or the furnace roof (4) of the electric arc furnace (1).
11. Method in accordance with any of Claims 1 to 10, characterized by the fact that the preforms (8) are introduced into the slag (7) in a directed way in the vicinity of or directly at the hot spots of the electrodes (5a-c).
CA2519728A 2003-05-24 2004-04-23 Method for producing foamed slag on high-chromium melts in an electric furnace Expired - Fee Related CA2519728C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10323505A DE10323505A1 (en) 2003-05-24 2003-05-24 Process for producing a foam slag on high-chromium melts in an electric furnace
DE10323505.1 2003-05-24
PCT/EP2004/004312 WO2004104232A1 (en) 2003-05-24 2004-04-23 Method for producing foamed slag on high-chromium melts in an electric furnace

Publications (2)

Publication Number Publication Date
CA2519728A1 true CA2519728A1 (en) 2004-12-02
CA2519728C CA2519728C (en) 2011-06-14

Family

ID=33441236

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2519728A Expired - Fee Related CA2519728C (en) 2003-05-24 2004-04-23 Method for producing foamed slag on high-chromium melts in an electric furnace

Country Status (13)

Country Link
US (2) US20060260435A1 (en)
EP (1) EP1629126B1 (en)
JP (1) JP4701331B2 (en)
KR (1) KR101174691B1 (en)
CN (2) CN102061356A (en)
CA (1) CA2519728C (en)
DE (1) DE10323505A1 (en)
MY (1) MY146471A (en)
RU (1) RU2343208C2 (en)
TW (1) TWI295690B (en)
UA (1) UA84151C2 (en)
WO (1) WO2004104232A1 (en)
ZA (1) ZA200505659B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114317885A (en) * 2022-01-11 2022-04-12 安徽工业大学 Biomass electric furnace foaming agent and preparation method and application method thereof

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004532B4 (en) * 2006-02-01 2014-10-09 Sms Siemag Aktiengesellschaft Process for producing a foamed slag in a metallic melt
DE102007006529A1 (en) * 2007-02-09 2008-08-14 Sms Demag Ag Process and reduction of a chromium-containing slag in an electric arc furnace
DE102007050478A1 (en) 2007-10-23 2009-04-30 Sms Demag Ag Process for stainless steel production with direct reduction furnaces for ferrochrome and ferronickel on the primary side of a converter
DE102008028011A1 (en) * 2008-06-09 2009-12-10 Sms Siemag Aktiengesellschaft Process for producing a foamed slag on austenitic stainless melts in an electric arc furnace
DE102008032975A1 (en) * 2008-07-07 2010-01-14 Sms Siemag Aktiengesellschaft Process for producing foamed slag
DE102009020494A1 (en) * 2009-05-08 2010-11-11 Sms Siemag Ag A method of slag foaming a non-stainless steel melt in an electric arc furnace
DE102009043639A1 (en) 2009-09-29 2011-03-31 Sms Siemag Aktiengesellschaft Method and apparatus for controlling the production of a foamed slag in a metallic melt
DE102010004983A1 (en) * 2010-01-19 2011-07-21 SMS Siemag Aktiengesellschaft, 40237 Process for the production of foam slag of a stainless melt in a converter
DE102010022692A1 (en) 2010-03-17 2011-09-22 Sms Siemag Ag Briquette for producing a foamed slag effect in stainless steel EAF technology
KR101229899B1 (en) * 2010-12-22 2013-02-05 주식회사 포스코 Material for promoting slag forming
KR101499200B1 (en) * 2013-06-27 2015-03-05 현대제철 주식회사 Furnace
ES2623457T3 (en) * 2014-12-17 2017-07-11 Refractory Intellectual Property Gmbh & Co. Kg Mixture, use of this mixture as well as procedure for conditioning a slag found on molten metal in a metallurgical bucket in the iron and steel metallurgical industry
CN104726636A (en) * 2015-03-30 2015-06-24 山西太钢不锈钢股份有限公司 Foaming agent for smelting stainless steel employing electric furnace and foaming method for foaming agent
JP6620781B2 (en) * 2017-05-15 2019-12-18 Ｊｆｅスチール株式会社 Dust smelting reduction method and reuse method

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US3807986A (en) * 1971-06-09 1974-04-30 Lukens Steel Co Combination iron and iron oxide briquette and method of using
US3843767A (en) * 1972-03-27 1974-10-22 Du Pont Process for treating fluophosphate ores
US3925060A (en) * 1974-09-23 1975-12-09 Timken Co Compact containing iron oxide and carbon and method for its use in steelmaking
JPH04131314A (en) * 1990-09-21 1992-05-06 Nippon Stainless Steel Co Ltd Method for recovering valuable metal from byproduct at the time of manufacturing stainless steel
EP0655508B1 (en) 1993-11-30 1998-08-19 ACCIAI SPECIALI TERNI S.p.a. Process for using foamed slag in stainless steel production in the electric arc furnace
FR2753205B1 (en) * 1996-09-12 1998-12-04 Usinor Sacilor PROCESS FOR PRODUCING A FOAMING SLAG OVER A STAINLESS STEEL MELTING IN AN ELECTRIC OVEN
JPH11302712A (en) * 1998-04-16 1999-11-02 Tetsugen Corp Reduction dissolution refining method for iron oxide
SE512757C2 (en) 1998-09-03 2000-05-08 Uddeholm Technology Ab Addition of doping agents in the manufacture of steel in arc furnaces, doping agents and their use
US6214085B1 (en) * 1999-02-01 2001-04-10 Calderon Energy Company Of Bowling Green, Inc. Method for direct steelmaking
LU90409B1 (en) * 1999-06-25 2001-01-02 Wurth Paul Sa Proc-d- for optimizing the operation of an electric furnace of the - submerged arc- type
LU90481B1 (en) 1999-12-01 2001-06-05 Wurth Paul Sa Post-treatment process for metallurgical slag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114317885A (en) * 2022-01-11 2022-04-12 安徽工业大学 Biomass electric furnace foaming agent and preparation method and application method thereof
CN114317885B (en) * 2022-01-11 2022-11-22 安徽工业大学 Biomass electric furnace foaming agent and preparation method and application method thereof

Also Published As

Publication number Publication date
TW200427844A (en) 2004-12-16
US20060260435A1 (en) 2006-11-23
JP2007501900A (en) 2007-02-01
KR20060004700A (en) 2006-01-12
MY146471A (en) 2012-08-15
US20130000446A1 (en) 2013-01-03
TWI295690B (en) 2008-04-11
EP1629126B1 (en) 2013-03-13
KR101174691B1 (en) 2012-08-17
UA84151C2 (en) 2008-09-25
CN1795277A (en) 2006-06-28
DE10323505A1 (en) 2004-12-09
EP1629126A1 (en) 2006-03-01
RU2343208C2 (en) 2009-01-10
WO2004104232A1 (en) 2004-12-02
WO2004104232A8 (en) 2006-03-02
JP4701331B2 (en) 2011-06-15
CA2519728C (en) 2011-06-14
ZA200505659B (en) 2006-08-30
RU2005140564A (en) 2006-05-10
CN102061356A (en) 2011-05-18

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Effective date: 20220301

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