EP3071714B1 - 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
EP3071714B1
EP3071714B1 EP14766976.6A EP14766976A EP3071714B1 EP 3071714 B1 EP3071714 B1 EP 3071714B1 EP 14766976 A EP14766976 A EP 14766976A EP 3071714 B1 EP3071714 B1 EP 3071714B1
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EP
European Patent Office
Prior art keywords
melt
metallurgical
carbon dioxide
metal melt
metal
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
EP14766976.6A
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German (de)
English (en)
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EP3071714A1 (fr
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 Group GmbH
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SMS Group GmbH
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Publication date
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Publication of EP3071714A1 publication Critical patent/EP3071714A1/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
    • C21C7/072—Treatment with gases

Definitions

  • the invention is directed to a method for the metallurgical treatment of a carbon-containing 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 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.
  • LU38496 discloses, for example, an oxygen-carbon dioxide blowing method for decarburizing a melt.
  • ferro-alloys in particular FeCr and FeMn alloys
  • metallurgical treatments A rgon- O xygen- ecarburisation D
  • CLU C reusot L oire U ddeholm
  • VOD V acuum O xygen D ecarburisation in VODC (V acuum O xygen D ecarburisation C onverter) systems performed.
  • oxygen and inert gases such as argon or nitrogen are usually used as process gases.
  • 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.
  • CO 2 carbon dioxide
  • a molten metal
  • CO carbon monoxide
  • 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 inventive method is also accompanied by a highly efficient reduction of oxides contained in the slag on the molten metal by the resulting and / or dissolved CO in CO 2 bubbles, whereby the metal extraction is effectively increased.
  • 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 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 here in particular in the melting process in an electric arc furnace (Electric Arc 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 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)

Claims (9)

  1. Procédé pour le traitement métallurgique d'un métal en fusion contenant du carbone dans le cadre d'un procédé de fabrication, en particulier au cours d'un procédé de traitement métallurgique final ou d'une étape finale de traitement métallurgique, au moyen d'un gaz de traitement appliqué (introduit), en particulier soufflé (insufflé) sur et/ou dans le métal en fusion,
    dans lequel, à titre de gaz de traitement, on souffle (insuffle) du dioxyde de carbone (CO2) sur et/ou dans le métal en fusion et on l'introduit dans le métal en fusion et, en mettant en oeuvre la réaction endothermique de Boudouard, on le fait réagir au moins en partie avec le carbone présent, en particulier dissous dans le métal en fusion, pour obtenir du monoxyde de carbone (CO) à titre de gaz de produit ;
    caractérisé en ce que le traitement métallurgique comprend la décarburation et la désiliciation et la déphosphoration du métal en fusion au moyen du dioxyde de carbone (CO2) à titre de gaz de traitement et du monoxyde de carbone (CO) de la réaction de Boudouard à titre de gaz de produit.
  2. Procédé selon la revendication 1, caractérisé en ce que qu'on souffle (insuffle) le dioxyde de carbone (CO2) à titre de gaz de traitement sur et/ou dans du fer en fusion, en particulier un alliage de fer ou de l'acier en fusion, de préférence de la fonte brute ou de l'acier brut en fusion.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que qu'on souffle (insuffle) le dioxyde de carbone (CO2) au cours d'un procédé métallurgique de fabrication de l'acier ou au cours d'un procédé de fabrication d'un alliage, au cours de toutes les étapes opératoires ou au cours d'une dernière étape opératoire sur et/ou dans le métal en fusion, en particulier du fer en fusion, de préférence un alliage de fer ou de l'acier en fusion, de manière préférentielle de la fonte brute ou de l'acier brut en fusion.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on réduit des oxydes métalliques contenus dans un laitier se trouvant sur le métal en fusion, comme par exemple des composés contenant du chrome, du nickel ou du manganèse, au moyen du monoxyde de carbone (CO) à titre de gaz de produit obtenu à partir du dioxyde de carbone (CO2) à titre de gaz de traitement introduit dans le métal en fusion et/ou au moyen d'un gaz contenant du CO introduit dans le métal en fusion au cours du traitement métallurgique du métal en fusion dans le cadre du procédé métallurgique de fabrication, en particulier au cours du procédé métallurgique de traitement final ou d'une étape finale du traitement métallurgique.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on oxyde, au moyen du dioxyde de carbone (CO2) à titre de gaz de traitement des composés et/ou des éléments qui sont contenus dans le métal en fusion, en particulier du carbone et/ou du silicium.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on minimise, au moyen du dioxyde de carbone (CO2) à titre de gaz de traitement et/ou du monoxyde de carbone (CO) à titre de gaz de produit, l'oxydation par le chrome du chrome contenu dans le métal en fusion et/ou dans le laitier.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, parallèlement à une introduction de dioxyde de carbone ou à une insufflation de dioxyde de carbone dans et/ou sur le métal en fusion, on utilise la technologie du laitier mousseux.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on met en oeuvre le traitement métallurgique dans une cuve métallurgique, en particulier dans un convertisseur ou dans un convertisseur à vide ou dans un convertisseur combiné à vide ou dans un four à arc électrique.
  9. Procédé selon la revendication 8, caractérisé en ce qu'on met en oeuvre le traitement métallurgique dans un four à arc électrique au cours de la période de (super)chauffage d'acier brut.
EP14766976.6A 2013-11-20 2014-09-16 Utilisation de co et de co2 dans le cadre d'une technologie d'acier et d'alliage Active EP3071714B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013019338 2013-11-20
DE102014205572.5A DE102014205572A1 (de) 2013-11-20 2014-03-26 CO und CO2 Anwendung bei einer Stahl- und Legierungstechnologie
PCT/EP2014/069651 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

Publications (2)

Publication Number Publication Date
EP3071714A1 EP3071714A1 (fr) 2016-09-28
EP3071714B1 true EP3071714B1 (fr) 2017-03-29

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ID=51570497

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EP14766976.6A Active 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

Country Status (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11970748B2 (en) * 2019-02-13 2024-04-30 Sabic Global Technologies B.V. Steel decarburization using carbon dioxide
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU38496A1 (fr) *
DE3918155A1 (de) * 1989-06-03 1990-12-06 Messer Griesheim Gmbh Verfahren zum entkohlen von chromhaltigen stahlschmelzen mit ueber 10% cr-gehalt

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
DE102014205572A1 (de) 2015-05-21
EP3071714A1 (fr) 2016-09-28
WO2015074780A1 (fr) 2015-05-28

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