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EP2986743B1 - Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide - Google Patents

Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide Download PDF

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Publication number
EP2986743B1
EP2986743B1 EP14724289.5A EP14724289A EP2986743B1 EP 2986743 B1 EP2986743 B1 EP 2986743B1 EP 14724289 A EP14724289 A EP 14724289A EP 2986743 B1 EP2986743 B1 EP 2986743B1
Authority
EP
European Patent Office
Prior art keywords
converter
injected
vacuum
alloys
oxygen
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.)
Active
Application number
EP14724289.5A
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German (de)
English (en)
Other versions
EP2986743A1 (fr
Inventor
Johann Reichel
Lutz Rose
Jan Bader
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 Group GmbH
Original Assignee
SMS Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP2986743A1 publication Critical patent/EP2986743A1/fr
Application granted granted Critical
Publication of EP2986743B1 publication Critical patent/EP2986743B1/fr
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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
    • 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
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to a process for the preparation of ferroalloys, in particular FeCr and FeMn alloys, with low carbon content in the AOD converter,
  • Fe Cr Fe Mn AOD converter 1.0% 1.0% CLU converter 1.0% 1.0% VOD / VODC converter 0.4% 0.4%
  • Dividing the refining to the lowest C-content in the production of ferroalloys in two process stages with converter and vacuum system significantly reduces the cycle time of the individual plant components and enables lower carbon contents to be achieved ,
  • This division of the process steps shortens the treatment time in the individual treatment stages and thus increases the production of the entire system.
  • the VODC converter (V acuum O xygen D ecarburisation C onverter) connects these two process steps already in one unit.
  • the process is known from steelmaking, especially for the production of stainless steel and special steels. Vacuum converters have already been built by GHH, Leybold Heraeus, Daido and Demag.
  • a VODC converter oxygen is injected via a top lance into a converter vessel with soil washes (Ar or N 2 ) under vacuum in a steel melt for refining.
  • soil washes Ar or N 2
  • the technologies and plant components used have been significantly improved over time (vacuum pumps, vacuum lance insert, vacuum bunker, exhaust gas analysis, etc.).
  • the downside of this process is that the decarburization process, as in the VOD plant, only proceeds very slowly over an O 2 top lance with very low blow rates with low intermixing energy throughout the process.
  • the invention has for its object to simplify the manufacturing process.
  • the first stage involves the desilication and the main decarburization of the melt and is carried out on the basis of the AOD process under atmospheric conditions.
  • oxygen is injected into the melt via a top lance and oxygen and CO 2 via the underbath nozzles.
  • the process in the converter vessel is run under vacuum.
  • a vacuum cap is run over the converter mouth and with the help of side nozzles under vacuum.
  • the partial pressure reduction of CO takes place to one via the injection of inert gas and in parallel via a pressure reduction in the vessel.
  • the gases CO 2 or C m H 2m + 2 in turn, cause an endothermic reaction and, in the application of CO 2, the Boudouard reaction (the carbon content of the melt is in this phase still well over 1%) use.
  • Boudouard equilibrium is the temperature-dependent chemical equilibrium between carbon, carbon monoxide and carbon dioxide.
  • Oxygen can be mixed with CO 2 on the process and protective gas sides of the annular gap nozzle.
  • the use of these gases also has the consequence in this process phase that the coolant requirement can be reduced.
  • the slag is reduced with the aid of conventional reducing agents and slag formers.
  • the new process also uses CO 2 .
  • the CO 2 will react in the melt with the carbon (Boudouard reaction) to CO.
  • Boudouard reaction to CO.
  • CO supports the reduction of the slag, which leads to lowest chromium oxide / manganese oxide contents in the slag and thus to higher outputs of the respective reduced metals.
  • Inert gas in the form of Ar or N 2 can also be used as purge gas.
  • the reduction of slag can take place both under vacuum and under atmospheric conditions.
  • the vacuum converter is equipped with a valve station that allows mixing of the process and inert gases used for the top lance and bottom bath nozzles.
  • the gases are mixed as follows, especially in the case of the underbath nozzles on the process and inert gas sides tuyeres tuyeres lance mixing ratio protective gas process gas O 2 X X N 2 X X Ar X X CO 2 X X X C m H 2m + 2 X O 2 + N 2 / air X X X 1: 4-4: 1 O 2 + Ar X 1: 4-4: 1 O 2 + CO 2 X X 1: 4-4: 1
  • the conditions for refining under vacuum in the AOD converter with simultaneous injection of large amounts of inert gas to lower the partial pressure of CO are significantly cheaper than in a VOD / VODC plant, because the reaction space, the specific blowing rates and the mixing energy of the reaction potential for decarburization in the Enlarge converter vessel significantly. For this reason, the decarburization rate in the vacuum converter is significantly greater than in a VOD or VODC system.
  • the refractory consumption of a conventional VOD / VODC system is significantly longer due to longer treatment times than with a vacuum converter.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (1)

  1. Procédé pour la fabrication de ferro-alliages, en particulier d'alliages FeCr et FeMn possédant une faible teneur en carbone dans un convertisseur à vide, caractérisé en ce que, dans le convertisseur à vide, au cours de la première étape, on effectue la désiliciation et la décarburation principale de la masse fondue sur base du procédé de conversion dans des conditions atmosphériques, dans lequel on introduit par soufflage, dans la masse fondue, via une lance supérieure, de l'oxygène et, via des buses immergées, en particulier des buses à fente annulaire, de l'oxygène et du CO2, et en ce que, directement après, dans le même convertisseur, au cours d'une deuxième étape, on procède à la décarburation en profondeur sous vide, dans lequel on injecte, du côté du gaz de protection des buses immergées, en outre du CO2 ou du CmH2m+2; dans lequel, au cours de la première étape, du côté du gaz de protection des buses à fente annulaire, on injecte du CO2, du CmH2m+2 du Ar ou du N2, en plus du gaz inerte, et on injecte, du côté du gaz de traitement des buses à fente annulaire, de l'oxygène avec un gaz inerte tel que du CO2, de l'argon ou de l'azote.
EP14724289.5A 2013-04-15 2014-03-25 Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide Active EP2986743B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013006986 2013-04-15
DE201310014856 DE102013014856A1 (de) 2013-04-15 2013-09-02 Verfahren und Anlage zur Herstellung von Ferrolegierungen mit niedrigem Kohlenstoffgehalt in einem Vakuum-Konverter
PCT/DE2014/000164 WO2014169888A1 (fr) 2013-04-15 2014-03-25 Procédé et installation pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide

Publications (2)

Publication Number Publication Date
EP2986743A1 EP2986743A1 (fr) 2016-02-24
EP2986743B1 true EP2986743B1 (fr) 2017-02-01

Family

ID=51618168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14724289.5A Active EP2986743B1 (fr) 2013-04-15 2014-03-25 Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide

Country Status (3)

Country Link
EP (1) EP2986743B1 (fr)
DE (1) DE102013014856A1 (fr)
WO (1) WO2014169888A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021214220A1 (de) 2021-03-08 2022-09-08 Sms Group Gmbh Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt
DE102021214218A1 (de) 2021-03-08 2022-09-08 Sms Group Gmbh Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt
EP4056720A1 (fr) 2021-03-08 2022-09-14 SMS Group GmbH Procédé de fabrication d'un ferro-alliage à faible taux de carbone
EP4056721A1 (fr) 2021-03-08 2022-09-14 SMS Group GmbH Procédé de fabrication d'un ferro-alliage à faible taux de carbone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111424136A (zh) * 2019-01-10 2020-07-17 宝山钢铁股份有限公司 一种rh柔性自补偿密封通道及其柔性补偿方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2123212A1 (en) * 1971-01-29 1972-09-08 Creusot Loire Refinement and alloying of steel - in one furnace as one sequence of operations esp for stainless steel
DE4401244C2 (de) * 1994-01-18 2002-11-07 Ald Vacuum Techn Ag Verfahren zur Entkohlung von Stahlschmelzen
JP3531218B2 (ja) * 1994-06-20 2004-05-24 大同特殊鋼株式会社 低炭素含クロム鋼の製造方法
TW564262B (en) * 2001-09-20 2003-12-01 Nippon Steel Corp A method and apparatus for refining Cr containing melt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021214220A1 (de) 2021-03-08 2022-09-08 Sms Group Gmbh Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt
DE102021214218A1 (de) 2021-03-08 2022-09-08 Sms Group Gmbh Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt
EP4056720A1 (fr) 2021-03-08 2022-09-14 SMS Group GmbH Procédé de fabrication d'un ferro-alliage à faible taux de carbone
EP4056721A1 (fr) 2021-03-08 2022-09-14 SMS Group GmbH Procédé de fabrication d'un ferro-alliage à faible taux de carbone

Also Published As

Publication number Publication date
WO2014169888A1 (fr) 2014-10-23
EP2986743A1 (fr) 2016-02-24
DE102013014856A1 (de) 2014-10-16

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