EP3071714A1 - Co and co2 application in a steel and alloy technology - Google Patents

Co and co2 application in a steel and alloy technology

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Publication number
EP3071714A1
EP3071714A1 EP14766976.6A EP14766976A EP3071714A1 EP 3071714 A1 EP3071714 A1 EP 3071714A1 EP 14766976 A EP14766976 A EP 14766976A EP 3071714 A1 EP3071714 A1 EP 3071714A1
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EP
European Patent Office
Prior art keywords
molten metal
metallurgical
carbon dioxide
during
molten
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EP14766976.6A
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German (de)
French (fr)
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EP3071714B1 (en
Inventor
Johann Reichel
Lutz Rose
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SMS Group GmbH
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SMS Group GmbH
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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.

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  • 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

The invention relates to a method for metallurgical treatment of a carbonaceous metal melt during a manufacturing process, in particular during a metallurgical final treatment process or final treatment step, by means of a process gas incorporated, in particular blown, onto and/or into the metal melt, wherein a method for metallurgical treatment of a carbonaceous metal melt is improved. Said improvement is achieved in that carbon dioxide (CO2) is blown onto and/or into the metal melt, as a process gas, and is at least partially converted to carbon monoxide (CO) as a product gas in the process of the endothermic Boudouard reaction with the carbon present in, in particular released in, the metal melt.

Description

CO und CO2 Anwendung bei einer Stahl- und Legierungstechnologie CO and CO 2 application in a steel and alloy technology
Die Erfindung richtet sich auf ein Verfahren zur metallurgischen Behandlung einer kohlenstoffhaltigen Metallschmelze im Rahmen eines Herstellungsprozesses, insbesondere während eines metallurgischen Endbehandlungsprozesses oder Endbehandlungsschrittes, mittels eines auf und/oder in die Metallschmelze (ein)gebrachten, insbesondere (ein)geblasenen, Prozessgases. Im Rahmen des Herstellungsprozesses von Metallen, Metalllegierungen, Eisenlegierungen, Stahl etc., bei welchem das Produkt zumindest in einem Zwischenschritt in Form einer Metallschmelze vorliegt, erfolgt vielfach eine metallurgische Behandlung der Metallschmelze mittels eines auf die Metallschmelze aufgeblasenen und/oder in die Metallschmelze eingeblasenen Prozessgases. Mit Hilfe dieses Prozessgases laufen in dem Metallbad metallurgische Vorgänge wie die Entkohlung der Metallschmelze, eine Entsilizierung oder Entphosphorung ab. Ein Beispiel für eine solche metallurgische Behandlung einer kohlenstoffhaltigen Metallschmelze stellt das sogenannte Frischen mit Hilfe von Sauerstoff als Prozessgas dar. 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. In the context of the production process of metals, metal alloys, iron alloys, steel, etc., in which the product is present in the form of a molten metal at least in an intermediate step, 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.
Aber auch bei der Herstellung von Ferrolegierungen, insbesondere FeCr- und FeMn-Legierungen werden derartige metallurgische Behandlungen in sogenannten AOD(Argon-Oxygen-Decarburisation)-Konvertern, CLU (Creusot Loire Uddeholm)-Konvertern oder in VOD(Vacuum Oxygen Decarburisation)- Anlagen oder in VODC(Vacuum Oxygen Decarburisation Converter)-Anlagen durchgeführt. Bei derartigen Verfahren werden in der Regel Sauerstoff und Inertgase wie Argon oder Stickstoff als Prozessgase eingesetzt. But also in the production of ferroalloys, in particular FeCr and FeMn alloys such 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. In such processes, oxygen and inert gases such as argon or nitrogen are usually used as process gases.
Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Verfahren zur metallurgischen Behandlung einer kohlenstoffhaltigen Metallschmelze bereitzustellen. Bei einem Verfahren der eingangs näher bezeichneten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass als Prozessgas Kohlendioxid (CO2) auf und/oder in die Metallschmelze (ein)geblasen und unter Ablauf der endothermen Boudouard-Reaktion zumindest teilweise mit in der Metallschmelze vorhandenem, insbesondere gelöstem, Kohlenstoff zu Kohlenmonoxid (CO) als Produktgas umgesetzt wird. The invention has for its object to provide an improved method for the metallurgical treatment of a carbonaceous molten metal. In a method of the type described in more detail, 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.
Vorteilhafte Ausgestaltungen und zweckmäßige Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche. Advantageous embodiments and expedient developments of the invention are the subject of the dependent claims.
Mit der Erfindung wird eine neue Technologie bereitgestellt, die die Anwendung von Kohlendioxid und Kohlenmonoxid als finales Produkt eines metallurgischen Prozesses, wobei es sich hierbei um jede Art von metallurgischem Prozess handeln kann, betrifft. Insofern handelt es sich hierbei insbesondere um eine metallurgische Behandlung im Rahmen eines metallurgischen Endbehandlungsprozesses oder Endbehandlungsschrittes einer kohlenstoffhaltigen Metallschmelze im Rahmen eines Herstellungsprozesses. Aber auch an jeder anderen Stelle im Rahmen eines Herstellungsprozesses mit einer entsprechenden metallurgischen Behandlung einer kohlenstoffhaltigen Metallschmelze kann das erfindungsgemäße Verfahren eingesetzt werden. Die Verwendung von Kohlendioxid und Kohlenmonoxid stellt bei der metallurgischen Behandlung einer kohlenstoffhaltigen Metallschmelze eine ökonomische Alternative gegenüber der Verwendung von Sauerstoff, Stickstoff oder Argon, insbesondere in/bei einem Stahlherstellungsprozess, dar. Bei einer Temperatur oberhalb von 1000 °C löst Kohlendioxid in Kontakt mit Kohlenstoff in der Schmelze einen Entkohlungsprozess mit einem endothermen Effekt aus, der sich aus dem Ablauf der Boudouard-Reaktion herleitet, wonach Kohlendioxid (CO2) mit Kohlenstoff (C) zu Kohlenmonoxid (2 CO) umgesetzt wird. Das Produktgas oder Reaktionsgas Kohlenmonoxid (CO) beansprucht das doppelte Volumen im Vergleich zu dem als Reaktionsgas oder Eduktgas in die Schmelze eingetragenen oder eingeblasenen Kohlenstoffdioxidvolumen und erhöht dadurch die Stark- Schmelz-Vermischung oder erhöht dadurch stark die Vermischung der Schmelze. Begleitet wird das erfindungsgemäße Verfahren zudem durch eine höchst effiziente Reduktion von in der auf der Metallschmelze befindlichen Schlacke enthaltenen Oxiden durch das entstehende und/oder gelöste CO beim CO2- Blasen, wodurch die Metallgewinnung effektiv erhöht wird. Weitere sich aus der Anwendung des erfindungsgemäßen Verfahrens ergebende Vorteile sind Entsilizierungs- und Entphosphorungsprozesse mit dem dissoziierten Sauerstoff aus dem Kohlendioxid. Da weiterhin die bei der Anwendung des erfindungsgemäßen Verfahrens ablaufenden drei wesentlichen Reaktionen, nämlich die Entkohlung, die Entsilizierung und die Entphosphorung der kohlenstoffhaltigen Metallschmelze stark endothermisch sind, eignen sich das Kohlendioxid und das entstehende Kohlenmonoxid als Kühlgase für stark exothermische Stahl- und Legierungs(herstellungs)prozesse, die durch einen hohen Kohlenstoff-, Silizium- oder Phosphorgehalt in der Metallschmelze geprägt sind. 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. In this respect, this is in particular 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. But also at any other point in the context of a manufacturing process with a corresponding metallurgical treatment of a carbonaceous molten metal process of the invention can be used. 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. At a temperature above 1000 ° C, 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. In addition, 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. Further, since the running in the application of the method according to the invention three essential reactions, namely the decarburization, desilication and Entphosphorung the carbonaceous molten metal are strongly endothermic, 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.
Die Erfindung zeichnet sich in vorteilhafter Ausgestaltung dadurch aus, dass das Prozessgas Kohlendioxid (CO2) auf und/oder in eine Eisenschmelze, insbesondere eine Eisenlegierungs- oder Stahlschmelze, vorzugsweise eine Roheisen- oder Rohstahlschmelze, (ein)geblasen wird. 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.
Von besonderem Vorteil ist es, wenn das Kohlendioxid (CO2) während eines metallurgischen Stahlherstellungsprozesses oder eines Legierungsher- Stellungsprozesses während aller Prozessstufen oder einer letzten Prozessstufe oder eines letzten Prozessschrittes desselben, auf und/oder in die Metallschmelze, insbesondere Eisenschmelze, vorzugsweise Eisenlegierungsoder Stahlschmelze, bevorzugt Roheisen- oder Rohstahlschmelze, (ein)geblasen wird, was die Erfindung ebenfalls vorsieht. Da eine metallurgische Behandlung einer kohlenstoffhaltigen Metallschmelze häufig als metallurgischer Endbehandlungsschritt bei der metallurgischen Behandlung einer Metallschmelze vorgenommen wird, zeichnet sich die Erfindung weiterhin dadurch aus, dass die metallurgische Behandlung, insbesondere der metallurgische Endbehandlungsprozess oder Endbehandlungsschritt, die Entkohlung und/oder die Entsilizierung und/oder die Entphosphorung der Metallschmelze, insbesondere Eisenschmelze, vorzugsweise Eisenlegierungsoder Stahlschmelze, bevorzugt Roheisen- oder Rohstahlschmelze, mittels des Prozessgases Kohlendioxid (CO2) und/oder des Produktgases Kohlenmonoxid (CO) der Boudouard-Reaktion umfasst. It is of particular advantage if the carbon dioxide (CO 2 ) during a metallurgical steelmaking process or an alloy preparation process during all process stages or a last process step or a last process step thereof, on and / or in the molten metal, in particular molten iron, preferably iron alloy or molten steel, preferably pig iron or crude steel melt, (a) is blown, which the invention also provides. Since a metallurgical treatment of a carbonaceous molten metal is often carried out as a metallurgical finishing step in the metallurgical treatment of molten metal, 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.
Da sich auf einer mit dem erfindungsgemäßen Verfahren zu behandelnden kohlenstoffhaltigen Metallschmelze in der Regel eine Schlackeschicht bildet, ist es gemäß weiterer Ausgestaltung der Erfindung zweckmäßig, dass in einer auf der Metallschmelze befindlichen Schlacke enthaltene Metalloxide, insbesondere chrom- und/oder nickel- und/oder manganhaltige Verbindungen, insbesondere Chrom- oder Nickel- oder Manganoxide, mittels des aus dem in die Metallschmelze eingebrachten Prozessgas Kohlendioxid (CO2) gebildeten Produktgases Kohlenmonoxid (CO) und/oder mittels eines in die Metallschmelze eingebrachten CO-haltigen Gases während der metallurgischen Behandlung der Metallschmelze im Rahmen des metallurgischen Herstellungsprozesses, insbesondere während des metallurgischen Endbehandlungsprozesses oder Endbehandlungsschrittes, reduziert werden. Durch das Einblasen von Kohlendioxid in eine kohlenstoffhaltige Metallschmelze lassen sich Oxidationsprozesse von in der Metallschmelze enthaltenen Verbindungen und/oder Elementen durchführen, so dass sich die Erfindung weiterhin dadurch auszeichnet, dass mittels des Prozessgases Kohlendioxid (CO2) Verbindungen und/oder Elemente, die in der Metallschmelze enthalten sind, insbesondere Kohlenstoff und/oder Silizium, oxidiert werden. Allerdings lässt sich dadurch, dass auch reduzierendes Kohlenmonoxid entsteht, die Oxidation von Elementen auch begrenzen. Die Erfindung sieht daher weiterhin vor, dass mittels des Prozessgases Kohlendioxid (CO2) und/oder des Produktgases Kohlenmonoxid (CO) die Chromoxidation von in der Metallschmelze und/oder der Schlacke enthaltenem Chrom minimiert wird. Since a slag layer generally forms on a carbonaceous molten metal to be treated by the process according to the invention, it is expedient according to a further embodiment of the invention for 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. 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.
Besonders vorteilhaft ist die Anwendung des erfindungsgemäßen Verfahrens, wenn parallel zu einem Kohlendioxideintrag oder Kohlendioxideinblasen in und/oder auf die Metallschmelze die Schaumschlacke-Technologie angewendet wird, was die Erfindung ebenfalls vorsieht. Particularly advantageous is the application of the method according to the invention, when the foaming slag technology is applied in parallel to a carbon dioxide entry or carbon dioxide blowing in and / or on the molten metal, which the invention also provides.
Insbesondere lässt sich das erfindungsgemäße Verfahren vorteilhaft in einem metallurgischen Gefäß durchführen, welches die kohlenstoffhaltige Metallschmelze enthält. Die Erfindung zeichnet sich daher in weiterer Ausgestaltung auch dadurch aus, dass die metallurgische Behandlung in einem metallurgischen Gefäß, insbesondere einem Konverter oder einem Vakuumkonverter oder einem kombinierten Vakuumkonverter oder einem Elektrolichtbogenofen, durchgeführt wird. Insbesondere ist die Anwendung des erfindungsgemäßen Verfahrens auch im Zusammenhang mit Elektrolichtbogenofentechnologien und hier insbesondere beim Schmelzprozess in einem Elektrolichtbogenofen (Electric Are Furnace) vorteilhaft anwendbar, so dass die Erfindung sich schließlich auch noch dadurch auszeichnet, dass die metallurgische Behandlung in einem Elektrolichtbogenofen während der Rohstahl(super)heizperiode durchgeführt wird. In particular, 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. In particular, 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.
Hierbei ist mit dem englischen Begriff „super" die entsprechende Heizperiode (super heating period) näher bezeichnet. Durch das Einblasen von CO2 lässt sich in den metallurgischen Gefäßen insbesondere eine Stahl- und Legierungsproduktion mit einem effizienten Oxidieren durch das CO2 durchführen. Dies wird begleitet durch eine effiziente Siliziumoxidation durch das CO2, wobei durch das sich bildende oder parallel eingeblasene CO die Chromoxidation minimiert wird. Durch die sich aufgrund der CO2-Umwandlung zu CO nach der Boudouard-Reaktion ergebende Volumenverdopplung wird insbesondere bei der Schaumschlacke-Technologie der Schaumschlacke-Effekt erhöht. Weiterhin sind eine effektive Entsilizierung, Entphosphorisierung und Entstickung einer kohlenstoffhaltigen Metallschmelze bei einer Stahl- und Legierungsproduktion durch Anwendung des erfindungsgemäßen Verfahrens möglich. Die Anwendung des erfindungsgemäßen Verfahrens bei der Stahlerzeugung in einem Elektrolichtbogenofen führt wegen excessiver Metallbewegung durch hohe CO-Bildung und des direkten Kontakts mit dem Elektrolichtbogen zu einer Erhöhung der Temperaturgradienten in dem Elektrolichtbogenofen während der Metallheizperiode (super heating period), was zu einer Verkürzung der Betriebsprozesszeit führt. In this case, 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. Furthermore, 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.

Claims

Patentansprüche claims
1 . Verfahren zur metallurgischen Behandlung einer kohlenstoffhaltigen Metallschmelze im Rahmen eines Herstellungsprozesses, insbesondere während eines metallurgischen Endbehandlungsprozesses oder Endbehandlungsschrittes, mittels eines auf und/oder in die Metallschmelze (ein)gebrachten, insbesondere (ein)geblasenen, Prozessgases, 1 . 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, in particular blown (on) and / or into the molten metal,
dadurch gekennzeichnet,  characterized,
dass als Prozessgas Kohlendioxid (CO2) auf und/oder in die Metallschmelze (ein)geblasen und unter Ablauf der endothermen Boudouard-Reaktion zumindest teilweise mit in der Metallschmelze vorhandenem, insbesondere gelöstem, Kohlenstoff zu Kohlenmonoxid (CO) als Produktgas umgesetzt wird. that as the process gas carbon dioxide (CO 2 ) on and / or in the molten metal (a) is blown and at least partially reacted with the present in the molten metal, in particular dissolved carbon to carbon monoxide (CO) as product gas at the end of the endothermic Boudouard reaction.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Prozessgas Kohlendioxid (CO2) auf und/oder in eine Eisenschmelze, insbesondere eine Eisenlegierungs- oder Stahlschmelze, vorzugsweise eine Roheisen- oder Rohstahlschmelze, (ein)geblasen wird. 2. The method according to claim 1, characterized 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.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Kohlendioxid (CO2) während eines metallurgischen Stahlherstellungsprozesses oder eines Legierungsherstellungsprozesses, während aller Prozessstufen oder während einer letzten Prozessstufe auf und/oder in die Metallschmelze, insbesondere Eisenschmelze, vorzugsweise Eisenlegierungs- oder Stahlschmelze, bevorzugt Roheisenoder Rohstahlschmelze, (ein)geblasen wird. 3. The method according to claim 1 or 2, characterized in that the carbon dioxide (CO 2 ) during a metallurgical steelmaking process or an alloying process, during all process stages or during a final process stage on and / or in the molten metal, in particular molten iron, preferably iron alloy or Molten steel, preferably pig iron or crude steel melt, is blown.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die metallurgische Behandlung die Entkohlung und/oder die Entsilizierung und/oder die Entphosphorung der Metallschmelze, insbesondere Eisenschmelze, vorzugsweise Eisenlegierungs- oder Stahlschmelze, bevorzugt Roheisen- oder Rohstahlschmelze, mittels des Prozessgases Kohlendioxid (CO2) und/oder des Produktgases Kohlenmonoxid (CO) der Boudouard-Reaktion umfasst. 4. The method according to any one of the preceding claims, characterized in that the metallurgical treatment decarburization and / or desilication and / or dephosphorization of 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 comprises.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in einer auf der Metallschmelze befindlichen Schlacke enthaltene Metalloxide, wie z.B. chrom-, nickel oder manganhaltige Verbindungen, mittels des aus dem in die Metallschmelze eingebrachten Prozessgas Kohlendioxid (CO2) gebildeten Produktgases Kohlenmonoxid (CO) und/oder mittels eines in die Metallschmelze eingebrachten CO-haltigen Gases während der metallurgischen Behandlung der Metallschmelze im Rahmen des metallurgischen Herstellungsprozesses, insbesondere während des metallurgischen Endbehandlungsprozesses oder Endbehandlungsschrittes, reduziert werden. 5. The method according to any one of the preceding claims, characterized in that metal oxides contained in a slag on the molten metal, such as chromium, nickel or manganese compounds, by means of the introduced from the molten metal in the molten metal process gas carbon dioxide (CO 2 ) product gas carbon monoxide (CO) and / or by means of a CO-containing gas introduced into the molten metal during the metallurgical treatment of the molten metal during the metallurgical production process, in particular during the metallurgical finishing process or finishing step, are reduced.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mittels des Prozessgases Kohlendioxid (CO2) Verbindungen und/oder Elemente, die in der Metallschmelze enthalten sind, insbesondere Kohlenstoff und/oder Silizium, oxidiert werden. 6. The method according to any one of the preceding claims, characterized in that by means of the process gas carbon dioxide (CO 2 ) compounds and / or elements which are contained in the molten metal, in particular carbon and / or silicon, are oxidized.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mittels des Prozessgases Kohlendioxid (CO2) und/oder des Produktgases Kohlenmonoxid (CO) die Chromoxidation von in der Metallschmelze und/oder der Schlacke enthaltenem Chrom minimiert wird. 7. The method according to any one of the preceding claims, characterized in 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 slag is minimized.
8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass parallel zu einem Kohlendioxideintrag oder Kohlendioxideinblasen in und/oder auf die Metallschmelze die Schaumschlacke-Technologie angewendet wird. 8. The method according to any one of the preceding claims, characterized in that parallel to a carbon dioxide entry or Carbon dioxide blowing into and / or on the molten metal the foaming slag technology is applied.
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die metallurgische Behandlung in einem metallurgischen Gefäß, insbesondere einem Konverter oder einem Vakuumkonverter oder einem kombinierten Vakuumkonverter oder einem Elektrolichtbogenofen, durchgeführt wird. Method according to one of the preceding claims, characterized in 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.
Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die metallurgische Behandlung in einem Elektrolichtbogenofen während der Rohstahl(super)heizperiode durchgeführt wird. A method according to claim 9, characterized in that the metallurgical treatment is carried out in an electric arc furnace during the crude steel (super) heating period.
EP14766976.6A 2013-11-20 2014-09-16 Co and co2 application in a steel and alloy technology Active EP3071714B1 (en)

Applications Claiming Priority (3)

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DE102013019338 2013-11-20
DE102014205572.5A DE102014205572A1 (en) 2013-11-20 2014-03-26 CO and CO2 application in a steel and alloy technology
PCT/EP2014/069651 WO2015074780A1 (en) 2013-11-20 2014-09-16 Co and co2 application in a steel and alloy technology

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WO2020165795A1 (en) * 2019-02-13 2020-08-20 Sabic Global Technologies B.V. Steel decarburization using carbon dioxide
CN113025778B (en) * 2021-03-03 2022-09-20 攀钢集团攀枝花钢铁研究院有限公司 Method for reducing carbon powder consumption in electric furnace oxidation process

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