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WO2015074780A1 - Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage - Google Patents

Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage Download PDF

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Publication number
WO2015074780A1
WO2015074780A1 PCT/EP2014/069651 EP2014069651W WO2015074780A1 WO 2015074780 A1 WO2015074780 A1 WO 2015074780A1 EP 2014069651 W EP2014069651 W EP 2014069651W WO 2015074780 A1 WO2015074780 A1 WO 2015074780A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
metallurgical
carbon dioxide
during
molten
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.)
Ceased
Application number
PCT/EP2014/069651
Other languages
German (de)
English (en)
Inventor
Johann Reichel
Lutz Rose
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
SMS Siemag AG
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 Siemag AG filed Critical SMS Siemag AG
Priority to EP14766976.6A priority Critical patent/EP3071714B1/fr
Publication of WO2015074780A1 publication Critical patent/WO2015074780A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • C21C7/072—Treatment with gases

Definitions

  • the invention is directed to a method for the metallurgical treatment of a carbonaceous molten metal during a production process, in particular during a metallurgical finishing process or finishing step, by means of a process gas blown on and / or into the molten metal, in particular blown process gas.
  • a metallurgical treatment of the molten metal is frequently carried out by means of a process gas blown onto the molten metal and / or blown into the molten metal , With the aid of this process gas, metallurgical processes such as decarburization of the molten metal, desilication or dephosphorization take place in the metal bath.
  • An example of such a metallurgical treatment of a carbon-containing molten metal is the so-called fresh with the aid of oxygen as a process gas.
  • ferroalloys in particular FeCr and FeMn alloys
  • metallurgical treatments in so-called AOD (argon oxygen decarburization) converters, CLU (Creusot Loire Uddeholm) converters or in VOD (Vacuum Oxygen Decarburisation) - plants or in VODC (Vacuum Oxygen Decarburization Converter) plants.
  • AOD argon oxygen decarburization
  • CLU Cereusot Loire Uddeholm
  • VOD Vauum Oxygen Decarburisation
  • VODC Vauum Oxygen Decarburization Converter
  • the invention has for its object to provide an improved method for the metallurgical treatment of a carbonaceous molten metal.
  • this object is achieved in that as the process gas carbon dioxide (CO 2 ) and / or blown into the molten metal (a) and at least partially under existing endothermic Boudouard reaction with existing in the molten metal, in particular, dissolved carbon is converted to carbon monoxide (CO) as product gas.
  • the invention provides a new technology that relates to the use of carbon dioxide and carbon monoxide as the final product of a metallurgical process, which may be any type of metallurgical process.
  • a metallurgical treatment in the context of a metallurgical finishing process or finishing step of a carbonaceous molten metal in the context of a manufacturing process.
  • the use of carbon dioxide and carbon monoxide in the metallurgical treatment of a carbonaceous molten metal is an economical alternative to the use of oxygen, nitrogen or argon, particularly in a steelmaking process.
  • carbon dioxide dissolves in contact with carbon in the melt, a decarburization process with an endothermic effect, which is derived from the sequence of the Boudouard reaction, after which carbon dioxide (CO 2 ) with carbon (C) is converted to carbon monoxide (2 CO).
  • the product gas or reaction gas carbon monoxide (CO) consumes twice the volume compared to that introduced into the melt as reaction gas or educt gas or injected carbon dioxide volume and thereby increases the strong melt mixing or thereby greatly increases the mixing of the melt.
  • the process according to the invention is accompanied by highly efficient reduction of oxides contained in the slag on the molten metal due to the CO formed and / or dissolved in CO 2 bubbles, as a result of which the metal extraction is effectively increased.
  • Further advantages resulting from the use of the method according to the invention are desilication and dephosphorization processes with the dissociated oxygen from the carbon dioxide.
  • the carbon dioxide and the resulting carbon monoxide are suitable as cooling gases for highly exothermic steel and alloy (manufacture) Processes that are characterized by a high carbon, silicon or phosphorus content in the molten metal.
  • the invention is characterized in an advantageous embodiment in that the process gas carbon dioxide (CO 2 ) on and / or in an molten iron, in particular an iron alloy or molten steel, preferably a pig iron or crude steel melt, (a) is blown.
  • CO 2 carbon dioxide
  • the invention is further characterized in that the metallurgical treatment, in particular the metallurgical finishing or finishing step, decarburization and / or desilication and / or the dephosphorization of the molten metal, in particular molten iron, preferably iron alloy or molten steel, preferably pig iron or crude steel melt, by means of the process gas carbon dioxide (CO 2 ) and / or the product gas carbon monoxide (CO) of the Boudouard reaction.
  • the metallurgical treatment in particular the metallurgical finishing or finishing step, decarburization and / or desilication and / or the dephosphorization of the molten metal, in particular molten iron, preferably iron alloy or molten steel, preferably pig iron or crude steel melt, by means of the process gas carbon dioxide (CO 2 ) and / or the product gas carbon monoxide (CO) of the Boudouard reaction.
  • a slag layer generally forms on a carbonaceous molten metal to be treated by the process according to the invention
  • metal oxides present in a slag on the molten metal in particular chromium and / or nickel and / or manganese-containing compounds, in particular chromium or nickel or manganese oxides, by means of the product gas carbon monoxide (CO) formed from the process gas carbon dioxide (CO 2 ) introduced into the molten metal and / or by means of a CO-containing gas introduced into the molten metal during the metallurgical treatment of Metal melt in the metallurgical manufacturing process, in particular during the metallurgical finishing process or finishing step can be reduced.
  • CO product gas carbon monoxide
  • the invention By blowing carbon dioxide into a carbon-containing molten metal, oxidation processes of compounds and / or elements contained in the molten metal can be carried out, so that the invention is further distinguished by the fact that by means of the process gas carbon dioxide (CO 2 ) compounds and / or elements which in are contained in the molten metal, in particular carbon and / or silicon, are oxidized. However, reducing carbon monoxide also limits the oxidation of elements.
  • the invention therefore further provides that by means of the process gas carbon dioxide (CO 2 ) and / or the product gas carbon monoxide (CO), the chromium oxidation of chromium contained in the molten metal and / or the slag is minimized.
  • the method according to the invention can advantageously be carried out in a metallurgical vessel which contains the carbon-containing molten metal.
  • the invention is therefore characterized in another embodiment by the fact that the metallurgical treatment in a metallurgical vessel, in particular a converter or a vacuum converter or a combined vacuum converter or an electric arc furnace is performed.
  • the application of the method according to the invention is also advantageous in connection with electric arc furnace technologies and in particular during the melting process in an electric arc furnace (Electric Are Furnace), so that the invention finally also distinguished by the fact that the metallurgical treatment in an electric arc furnace during the crude steel ( super) heating period is performed.
  • the term "super” refers to the corresponding heating period (super heating period) in more detail.
  • injection of CO 2 into the metallurgical vessels makes it possible, in particular, to produce steel and alloy with an efficient heating process Oxidize through the CO 2 .
  • This is accompanied by efficient silicon oxidation by the CO 2 , which is minimized by the forming or parallel injected CO, the oxidation of chromium. Due to the CO 2 conversion to CO after the Boudouard reaction resulting volume doubling the foam slag effect is increased especially in the foam slag technology.
  • an effective desilication, dephosphorization and denitrification of a carbonaceous molten metal in a steel and alloy production by application of the method according to the invention are possible.
  • the use of the inventive method in steelmaking in an electric arc furnace leads to an increase in temperature gradients in the electric arc furnace during the super heating period due to excessive metal movement due to high CO formation and direct contact with the electric arc, resulting in a shortening of the operating process time leads.

Landscapes

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

Abstract

L'invention concerne un procédé de traitement métallurgique d'une masse fondue métallique contenant du carbone dans le cadre d'un processus de fabrication, en particulier pendant un processus de traitement final métallurgique ou une étape de traitement final, au moyen d'un gaz de traitement introduit, en particulier soufflé, sur et/ou dans la masse fondue métallique. L'invention vise à fournir un procédé amélioré de traitement métallurgique d'une masse fondue métallique contenant du carbone. A cet effet, selon l'invention, du dioxyde de carbone (CO2) en tant que gaz de traitement est soufflé sur et/ou dans la masse fondue métallique et, au cours de la réaction endothermique de Boudouard, le carbone présent au moins en partie dans la masse fondue métallique, en particulier dissout, est converti en monoxyde de carbone (CO) en tant que produit gazeux.
PCT/EP2014/069651 2013-11-20 2014-09-16 Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage Ceased WO2015074780A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14766976.6A EP3071714B1 (fr) 2013-11-20 2014-09-16 Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102013019338 2013-11-20
DE102013019338.9 2013-11-20
DE102014205572.5 2014-03-26
DE102014205572.5A DE102014205572A1 (de) 2013-11-20 2014-03-26 CO und CO2 Anwendung bei einer Stahl- und Legierungstechnologie

Publications (1)

Publication Number Publication Date
WO2015074780A1 true WO2015074780A1 (fr) 2015-05-28

Family

ID=51570497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/069651 Ceased WO2015074780A1 (fr) 2013-11-20 2014-09-16 Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage

Country Status (3)

Country Link
EP (1) EP3071714B1 (fr)
DE (1) DE102014205572A1 (fr)
WO (1) WO2015074780A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020165795A1 (fr) * 2019-02-13 2020-08-20 Sabic Global Technologies B.V. Décarburation d'acier au moyen de dioxyde de carbone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113025778B (zh) * 2021-03-03 2022-09-20 攀钢集团攀枝花钢铁研究院有限公司 一种降低电炉氧化法碳粉消耗的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU38496A1 (fr) *
EP0401530A2 (fr) * 1989-06-03 1990-12-12 Messer Griesheim Gmbh Procédé de décarburation d'acier en fusion contenant du chrome avec plus de 10% de chrome

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU38496A1 (fr) *
EP0401530A2 (fr) * 1989-06-03 1990-12-12 Messer Griesheim Gmbh Procédé de décarburation d'acier en fusion contenant du chrome avec plus de 10% de chrome

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020165795A1 (fr) * 2019-02-13 2020-08-20 Sabic Global Technologies B.V. Décarburation d'acier au moyen de dioxyde de carbone
CN113614255A (zh) * 2019-02-13 2021-11-05 沙特基础工业全球技术公司 利用二氧化碳进行钢脱碳
US20220136076A1 (en) * 2019-02-13 2022-05-05 Sabic Global Technologies B.V. Steel decarburization using carbon dioxide
US11970748B2 (en) 2019-02-13 2024-04-30 Sabic Global Technologies B.V. Steel decarburization using carbon dioxide

Also Published As

Publication number Publication date
EP3071714B1 (fr) 2017-03-29
EP3071714A1 (fr) 2016-09-28
DE102014205572A1 (de) 2015-05-21

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