EP1636390B1 - Method for treating melt metals by means of a refining oxygen-based agent - Google Patents

Method for treating melt metals by means of a refining oxygen-based agent Download PDF

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Publication number
EP1636390B1
EP1636390B1 EP04741571A EP04741571A EP1636390B1 EP 1636390 B1 EP1636390 B1 EP 1636390B1 EP 04741571 A EP04741571 A EP 04741571A EP 04741571 A EP04741571 A EP 04741571A EP 1636390 B1 EP1636390 B1 EP 1636390B1
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EP
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Prior art keywords
oxygen
liquid oxygen
jet
liquid
gaseous
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EP04741571A
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German (de)
French (fr)
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EP1636390A2 (en
Inventor
Paul Grohmann
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Air Liquide Deutschland GmbH
Messer Group GmbH
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Air Liquide Deutschland GmbH
Messer Group GmbH
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Priority to PL04741571T priority Critical patent/PL1636390T3/en
Priority to SI200431758T priority patent/SI1636390T1/en
Publication of EP1636390A2 publication Critical patent/EP1636390A2/en
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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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • 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
    • 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
    • C21C5/32—Blowing from above
    • 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
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C21C2250/00—Specific additives; Means for adding material different from burners or lances
    • C21C2250/04—Liquid gas
    • C21C2250/042—Liquid oxygen

Definitions

  • the invention relates to a method for treating molten metals, in particular molten steel, with a fresh medium of oxygen.
  • a number of process designations are derived from the nature of the oxygen incorporation, e.g. the LD, LDAC or OBM process.
  • inflation methods such as the AOD method used with oxygen and e.g. Work argon.
  • the gaseous oxygen is supplied via a lance or a Boden Whysteln the pig iron or the base alloy for the reaction.
  • the out DE 43 15 342 C1 known oxygen input in the refining of steel has the significant disadvantage that the pulse of the gas jet used to displace the slag over the steel bath can not be used for the liquid oxygen jet.
  • the liquid oxygen jet impinges on the slag, evaporates to a significant part, which is no longer available for the refining process.
  • the invention has for its object to provide a method for refining a molten metal, in which the disadvantages known from the prior art are at least partially overcome.
  • liquid and gaseous oxygen are used for the refining of steels according to Ausprüch 1, wherein the guided within the gaseous oxygen jet jet liquid oxygen is applied to a, already freed from the gaseous oxygen jet from the melt slag bath surface of the molten metal and / or introduced into the molten metal.
  • the oxygen entry according to the invention in steel refining has the significant advantage that the liquid oxygen comes into direct contact with the molten metal, as a result of which the oxygen evaporates abruptly due to the high temperatures prevailing in the focal spot of the molten metal, whereby an intensive bath movement is effected and an increased mass transfer in the molten metal - namely the oxidation, eg of the carbon to carbon monoxide, as well as the slagging of the pig iron reactants, e.g. Silicon and manganese - takes place.
  • the supply of the lance with gaseous oxygen is carried out in the usual way.
  • the execution of the lance tip can be designed as single or multi-point.
  • the supply of the lance with liquid oxygen takes place according to the prior art, but particularly advantageous by means of one of the DE 43 15 343 C1 known device.
  • liquid or gaseous oxygen from the oxygen supply to the lancembolhrenden lines are designed as flexible hoses and the liquid oxygen line / s additionally vacuum-insulated.
  • the refining process can be controlled by influencing the ratio of the entry amounts of gaseous and liquid oxygen and / or by influencing the gaseous or liquid oxygen pressure and the geometry of the blowing nozzle used for the gaseous oxygen input with respect to a higher fresh speed.
  • the impact energy of the liquid oxygen can be influenced.
  • the distance between the lance tip and the bath surface can be changed as in conventional lances.
  • the ratio of the amount of liquid and gaseous oxygen introduced by means of a blowing device into a molten metal bath can be adapted problematically to the respective operating conditions. There is a wide range of variation of almost 100% liquid oxygen and very low gaseous Antell and vice versa available.
  • the liquid oxygen jet (LOX) can also be fed intermittently to the bath surface. This can be done with larger diameters of the discharge - at the same mean mass flow -. As a result, a stable jet of liquid oxygen can be supplied to the molten bath.
  • liquid oxygen line other liquefied gases such. B. argon fed to the melt.
  • further metallurgical effects such as, for example, removal of undesired gases or inclusions in the molten metal or an additional stirring effect for homogenizing the melt can be obtained.
  • Fig. 1 is a device for injecting gaseous and liquid oxygen in a - not graphically represented - molten steel device shown.
  • the oxygen blowing device consists of a blowing lance 1, via whose with a water cooling 2 encased inflow channel 3, gaseous oxygen (GOX) is supplied through a discharge nozzle 4 as a gaseous oxygen jet 5 of the molten steel.
  • gaseous oxygen GOX
  • the oxygen blowing device also has a further, in the inflow channel 3 of the lance 1 centrically arranged LOX lance 6, on their provided with a thermal insulation 7 inflow channel 8 cryogenic liquid oxygen (LOX) through a discharge 9 as - from the gas jet 5 enveloped - centric Beam 10 liquid oxygen of the molten steel can be supplied.
  • LOX cryogenic liquid oxygen
  • the jet 10 supplied through the discharge nozzle 9 of the LOX lance 6 as the liquid jet of liquid molten steel supplied to the steel melt strikes the surface of the molten steel freed from the slag by the gas jet and evaporates as it enters the focal spot high-temperature molten bath abruptly, whereby an intensive bath movement is effected and thus an increased mass transfer in the molten steel - namely, the oxidation of the carbon to carbon monoxide, and the slagging of Rohelsenbegletter silicon and manganese - takes place.
  • the jet 10 of liquid oxygen is adapted to the respective flow conditions and the Reynolds number and can be supplied to the molten bath either as a homogeneous liquid jet or as a droplet jet.
  • the formation of the jet of liquid oxygen may be influenced by the degree of its supercooling.
  • the premature evaporation of the inflow channel 8 of the lance 6 flowing through liquid oxygen (LOX) preventing thermal insulation 7 consists of a conventional insulation material.
  • the jet 10 of liquid oxygen may also be fed intermittently to the molten steel.
  • Fig. 2 Is one - according to Fig. 1 formed - Einbch-Blasianze 11 shown schematically from which a - coated by a jet of gaseous oxygen, centric jet of liquid oxygen 10 in the region of liberated from slag 12 liquid steel bath 13 of a converter 14 impinges.
  • the supply of the liquid oxygen (LOX) used as a fresh medium from a liquid oxygen supply 15 into the one-hole blow lance 11 equipped with a cooling water connection 16 takes place through a line 17 designed as a flexible hose.
  • the supply of the gaseous oxygen (GOX) likewise used as a fresh medium takes place from a customary, unspecified oxygen gas supply into the Blasianze 11 by a, advantageously designed as a flexible hose line 18th
  • the from the DE 43 15 342 C1 known liquid oxygen supply 15 consists of a, equipped with conventional and therefore unspecified pipes and valves storage container 19 for liquid oxygen.
  • the fresh oxygen supplied to the steel bath 13 of the converter 14 arranged in the single-shot blower lance 11 is removed from the isollerten storage tank 19 through a line 20 and - if the pressure of the Speker mattersers 19 is insufficient - after a shut-off valve 21 via a remplissigigsauersboffpumpe 22 on the increased pressure and then introduced into a heat exchanger 23, the line 20 may additionally be provided with a - not shown in the drawing - sheath with a cryogenic medium, for example liquid nitrogen, to prevent premature evaporation of oxygen.
  • a cryogenic medium for example liquid nitrogen
  • a negative pressure is generated by means of a pump 26, by which the boiling temperature of the liquid oxygen used as a coolant in the heat exchanger 23 is lowered so that it can serve as a coolant for the fresh oxygen.
  • the liquid oxygen used for refining the steel bath 13 in the converter 14 is passed through the heat exchanger 23 in copper coils 27 and thereby cooled by the cooling oxygen surrounding it - depending on the prevailing pressure ratio - below its boiling temperature determined by the pressure. Thereafter, the liquid fresh aspirate is supplied through the formed as an insulated tube line 17 arranged in the converter 14 Einioch blow nozzle 11 - and together with the supplied via the line 18 of the lance 11 gaseous oxygen - in the manner previously explained in the steel bath 13 of Converter 14 blown.
  • a lance 1 with a Drelloch lance tip is shown, whose execution basically the in Fig. 1 described blowing lance 1 corresponds.
  • blowing lance 1 is the in Fig. 3 Blaslanze 1 described in such a way that both the liquid oxygen (LOX) and the gaseous oxygen (GOX) In the lance tip to a plurality of partial beams - according to Fig. 3 - Divided into three sub-beams.
  • LOX liquid oxygen
  • GOX gaseous oxygen
  • the division of the gaseous oxygen takes place from the inflow channel 3 for gaseous oxygen to the discharge nozzles 4 for gaseous oxygen located in the lance tip.
  • the division of the liquid oxygen is carried out by the division of the inlet channel 8 for liquid oxygen to three - in Fig. 3 not shown - inflow channels, which are each provided with a discharge nozzle 9 for liquid oxygen.
  • the Ausströmdüse / n 4 of the lance 1 of the stream 10 of liquid oxygen and the jet of liquid oxygen 10 enveloping jet of gaseous oxygen flow with a - for multi-hole lance tips usual - Inclination angle to the lance axis for refining the molten steel.
  • this angle is 25 °.
  • Fig. 4 is a, with its multi-hole lance tip in a converter 14 arranged multi-hole biasing lance 28 schematically shown, from which several, each of a beam 5 of gaseous oxygen enveloped, centric beams 10 liquid oxygen in the region of liberated from slag 12 liquid steel bath thirteenth of converter 14.
  • the supply of the gaseous oxygen (GOX) from a customary and therefore unspecified oxygen gas supply into the multi-hole lance 28 takes place through the line 18.
  • LOX liquid oxygen
  • GOX gaseous oxygen
  • the liquid oxygen (LOX) is supplied through the withdrawal line 20 via a shut-off valve 21 through an insulated line 30 a gas vapor separator 31.
  • a Standshandsregelungssystem 25 automatically holds the used for refining liquid oxygen in the gas phase separator 31 at the desired level, for which by means of a sensor 32, the level of liquid oxygen in the gas phase separator 31 is detected.
  • the gaseous oxygen is separated from the liquid oxygen.
  • the liquid oxygen (LOX) is supplied via the formed as an insulated tube line 17 of the arranged in the converter 14 multi-hole lance 28 and by means of this - together with the supplied via the line 18 gaseous oxygen - in an above-explained manner for refining the steel bath thirteenth used in the converter 14.
  • the gaseous oxygen content resulting from the external introduction of heat into the liquid oxygen is separated by the gas phase separator 31 Multi-hole Blaedüse 28 separated and fed via a - the Greeregedungwystern 26 containing - line 33 other unspecified consumers.

Abstract

The invention relates to a method and device for treating melt metals, in particular melt steels by means of a refining oxygen-based agent. The aim of said invention is to increase the performance of steel refining. For this purpose, a liquid oxygen jet enveloped with a gaseous oxygen jet is used.

Description

Die Erfindung betrifft ein Verfahren zum Behandeln von Metallschmelzen, insbesondere Stahlschmelzen, mit einem Frischmittel aus Sauerstoff.The invention relates to a method for treating molten metals, in particular molten steel, with a fresh medium of oxygen.

Es ist bekannt, zum Frischen von Stählen oxidierende Gase oder Gasgemische, insbesondere gasförmigen Sauerstoff, zu verwenden. Üblicherweise wird der Frischprozess in Konvertern durch Aufblasen oder Einblasen der Gase oder deren Kombination durchgeführt.It is known to use for refining steels oxidizing gases or gas mixtures, in particular gaseous oxygen. Usually, the refining process is carried out in converters by blowing or blowing in the gases or their combination.

Eine Reihe von Verfahrensbezeichnungen leiten sich aus der Art des Sauerstoffeinbringens ab, wie z.B. des LD-, LDAC- Verfahren oder der OBM-Prozeß. Darüber hinaus gibt es für legierte und hochlegierte Stähle Aufblasverfahren wie z. B. das AOD Verfahren, die mit Sauerstoff und z.B. Argon arbeiten. Dabei wird der gasförmige Sauerstoff über eine Lanze oder einen Bodenspülsteln dem Roheisen oder der Basislegierung zur Reaktion zugeführt.A number of process designations are derived from the nature of the oxygen incorporation, e.g. the LD, LDAC or OBM process. In addition, for alloyed and high-alloyed steels there are inflation methods such. For example, the AOD method used with oxygen and e.g. Work argon. The gaseous oxygen is supplied via a lance or a Bodenspülsteln the pig iron or the base alloy for the reaction.

Beim Frischen von Stählen mit gasförmigem Sauerstoff ergibt sich derzeit eine Blaszeit von 15 bis 18 min, um die im Roheisenbad enthaltenen Elemente wie beispielsweise Kohlenstoff, Silizium, Phosphor und Mangan zu oxidieren und damit das Roheisen bzw. Basislegierungen zu Stahl umzuwandeln.When refining steels with gaseous oxygen, there is currently a blowing time of 15 to 18 minutes in order to oxidize the elements contained in the pig iron bath, such as carbon, silicon, phosphorus and manganese, thus converting the pig iron or base alloys into steel.

Durch die DE 43 15 342 C1 ( EP 0 624 655 A1 ) ist weiterhin bekannt, beim Stahlschmelzen als Frischmittel flüssigen Sauerstoff als einphasige Flüssigkeit oder als Zweiphasen-gemisch, bestehend aus Gas und Flüssigkeit, einzusetzen.By the DE 43 15 342 C1 ( EP 0 624 655 A1 ) is also known, in the molten steel as a fresh medium liquid oxygen as a single-phase liquid or as a two-phase mixture, consisting of gas and liquid to use.

Der aus DE 43 15 342 C1 bekannte Sauerstoffeintrag beim Frischen von Stahl hat den wesentlichen Nachteil, dass der zum Verdrängen der Schlacke über dem Stahlbad verwendete Impuls des Gasstahles nicht für den flüssigen Sauerstoffstrahl genutzt werden kann. Der flüssige Sauerstoffstrahl prallt auf die Schlacke auf, verdampft dabei zu einem bedeutenden Teil, welcher für den Frischprozeß nicht mehr zur Verfügung steht.The out DE 43 15 342 C1 known oxygen input in the refining of steel has the significant disadvantage that the pulse of the gas jet used to displace the slag over the steel bath can not be used for the liquid oxygen jet. The liquid oxygen jet impinges on the slag, evaporates to a significant part, which is no longer available for the refining process.

Aus der JP 5-006311 ist ein weiteres Verfahren bekannt, bei dem über eine zentrale Düse flüssiger Sauerstoff und über mehrere, die zentrale Düse umgebende Düsen gasförmiger Sauerstoff auf eine Metallschmelze gerichtet werden kann.From the JP 5-006311 Another method is known in which via a central nozzle liquid oxygen and a plurality of surrounding the central nozzle nozzles, gaseous oxygen can be directed to a molten metal.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Frischen einer Metallschmelze anzugeben, bei dem die aus dem Stand der Technik bekannten Nachteile zumindest teilweise überwunden werden.The invention has for its object to provide a method for refining a molten metal, in which the disadvantages known from the prior art are at least partially overcome.

Die Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen von Anspruch 1 gelöst.The object is achieved by a method having the features of claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.

Erfindungsgemäß wird flüssiger und gasförmiger Sauerstoff zum Frischen von Stählen gemäß Ausprüch 1 eingesetzt, wobei der Innerhalb des gasförmigen Sauerstoffstrahls geführte Strahl flüssigen Sauerstoff auf eine, bereits von dem gasförmigen Sauerstoffstrahl von der Schmelzenschlacke befreite Badoberfläche der Metallschmelze aufgebracht und/oder In die Metallschmelze eingebracht wird.According to the invention, liquid and gaseous oxygen are used for the refining of steels according to Ausprüch 1, wherein the guided within the gaseous oxygen jet jet liquid oxygen is applied to a, already freed from the gaseous oxygen jet from the melt slag bath surface of the molten metal and / or introduced into the molten metal.

Der erfindungsgemäße Sauerstoffeintrag beim Stahlfrischen weist den wesentilchen Vorteil auf, dass der flüssige Sauerstoff direkt mit der Metallschmelze in Berührung kommt, wodurch der Sauer-stoff - auf Grund der in im Brennfleck der Metallschmelze herrschenden hohen Temperaturen - schlagartig verdampft, wodurch eine intensive Badbewegung bewirkt wird und ein verstärkter Stoffaustausch in der Metallschmelze - nämlich die Oxidation, z.B. des Kohlenstoffs zu Kohlenmonoxid, sowie die Verschlackung der Roheisenbegielter, z.B. Silizium und Mangan - stattfindet.The oxygen entry according to the invention in steel refining has the significant advantage that the liquid oxygen comes into direct contact with the molten metal, as a result of which the oxygen evaporates abruptly due to the high temperatures prevailing in the focal spot of the molten metal, whereby an intensive bath movement is effected and an increased mass transfer in the molten metal - namely the oxidation, eg of the carbon to carbon monoxide, as well as the slagging of the pig iron reactants, e.g. Silicon and manganese - takes place.

Darüber hinaus wird in der Metallschmelze zusätzliche Oberfläche für den Stoffaustausch durch Bildung vieler kleiner Schlacke und Metalltröpfchen gebildet, wodurch die Raum-Zeit-Ausbeute beim Frischen von Stahl wesentlich verbessert und damit die Blasedauer deutlich verringert werden kann.In addition, in the molten metal additional surface for mass transfer is formed by the formation of many small slag and metal droplets, whereby the space-time yield when refining steel significantly improved and thus the blast time can be significantly reduced.

Durch den erfindungsgeläßen Sauerstoffieintrag beim Stahifrischen kann die Durchsatzleistung von herkömmlichen Schmelzanlagen deutlich gesteigert werden.Due to the oxygen input according to the invention in the case of Stiff fishing, the throughput capacity of conventional melting plants can be significantly increased.

Die Versorgung der Blaslanze mit gasförmigem Sauerstoff erfolgt auf dem üblichen Wege. Die Ausführung der Lanzenspitze kann als Ein- oder Mehrlochspitze ausgeführt sein.The supply of the lance with gaseous oxygen is carried out in the usual way. The execution of the lance tip can be designed as single or multi-point.

Die Versorgung der Blaslanze mit flüssigem Sauerstoff erfolgt nach dem Stand der Technik, jedoch besonders vorteilhaft mittels einer aus der DE 43 15 343 C1 bekannten Vorrichtung.The supply of the lance with liquid oxygen takes place according to the prior art, but particularly advantageous by means of one of the DE 43 15 343 C1 known device.

Dazu sind die den flüssigen oder gasförmigen Sauerstoff von der Sauerstoff-Versorgung zur Blaslanze fülhrenden Leitungen als flexible Schläuche ausgebildet und die Flüssigsauerstoff-Leitung/en zusätzlich vakuum-isoliert.For this purpose, the liquid or gaseous oxygen from the oxygen supply to the lance fülhrenden lines are designed as flexible hoses and the liquid oxygen line / s additionally vacuum-insulated.

Der Frischprozess kann durch die Beeinflussung des Verhältnisses der Eintragsmengen an gasförmigem und flüssigem Sauerstoff und/oder durch die Beeinflussung des gasförmige oder flüssigen Sauerstoffdruckes sowie der Geometrie der für den gasförmigen Sauerstoffeintrag eingesetzten Blasdüse bezüglich einer höheren Frischgeschwindigkeit gesteuert werden.The refining process can be controlled by influencing the ratio of the entry amounts of gaseous and liquid oxygen and / or by influencing the gaseous or liquid oxygen pressure and the geometry of the blowing nozzle used for the gaseous oxygen input with respect to a higher fresh speed.

Des Weiteren kann durch Variation des Flüssigsauerstoffdruckes und der Düsengeometrie die Auftreffenergie des flüssigen Sauerstoffs beeinflusst werden.Furthermore, by varying the liquid oxygen pressure and the nozzle geometry, the impact energy of the liquid oxygen can be influenced.

Der Abstand zwischen der Lanzenspitze und der Badoberfläche kann wie bei herkömmlichen Blaslanzen verändert werden.The distance between the lance tip and the bath surface can be changed as in conventional lances.

Das Verhältnis der mittels eines Blasvorrichtung in ein metallisches Schmelzbad eingetragenen Menge an flüssigem und gasförmigem Sauerstoff kann problemios den jeweiligen Betriebsbedingungen angepasst werden. Dabei steht eine weite Variationsbreite von nahezu 100% flüssigem Sauerstoff und sehr geringem gasförmigem Antell und umgekehrt zur Verfügung.The ratio of the amount of liquid and gaseous oxygen introduced by means of a blowing device into a molten metal bath can be adapted problematically to the respective operating conditions. There is a wide range of variation of almost 100% liquid oxygen and very low gaseous Antell and vice versa available.

Der flüssige Sauerstoff-Strahl (LOX) kann auch intermittierend der Badoberfläche zugeführt werden. Dazu kann mit größeren Durchmessern der Ausströmöffnung - bei gleichem mittlerem Massenstrom - gearbeitet werden. Dadurch kann ein stabiles Strahl aus flüssigem Sauerstoff dem Schmelzbad zugeführt werden.The liquid oxygen jet (LOX) can also be fed intermittently to the bath surface. This can be done with larger diameters of the discharge - at the same mean mass flow -. As a result, a stable jet of liquid oxygen can be supplied to the molten bath.

Als Sauerstoff-Blaslanze sind herkömmlichen Ein- oder Mehrloch-Lanzenspitzen einsetzbar.As an oxygen lance conventional single or multi-hole lance tips are used.

Darüber hinaus ist es möglich durch die Flüssigsauerstoffleitung andere verflüssigte Gase wie z. B. Argon der Schmelze zuzuführen. Durch die bereits beschriebene intensive Badbewegung können weitere metallurgische Effekte wie z.B. Entfernen von in der Metallschmelze unerwünschten Gasen oder Einschlüssen oder ein zusätzlicher Rühreffekt zur Homogenisierung der Schmelze ersielt werden.In addition, it is possible by the liquid oxygen line other liquefied gases such. B. argon fed to the melt. As a result of the intensive bath movement already described, further metallurgical effects such as, for example, removal of undesired gases or inclusions in the molten metal or an additional stirring effect for homogenizing the melt can be obtained.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung (Fig. 1 bis 4) dargestellten Beipiels näher erläutert.In the following, the invention will be described with reference to a drawing (in Fig. 1 to 4 ) explained in more detail.

Es zeigen:

  • Fig. 1 eine schematische Darstellung einer Sauersttof-Blaslanze;
  • Fig. 2 eine schematische Darstellung einer Sauerstoffversorgung mit Zwischenkühlung und mit einer zum Frischen einer Stahlschmelze In einem Konverter angeordneten Blaslanze mit Einloch-Lanzenspitze;
  • Fig. 3 eine schematische Darstellung einer Sauerstoff-Blaslanze mit Mehrioch-Lanzenspitze;
  • Fig. 4 eine schematische Darstellung einer Sauerstoffversorgung mit Gasphasenabschelder und mit einer zum Frischen einer Stahlschmelze in einem Konverter angeordneten Blaslanze mit Mehrioch-Lanzenspitze.
Show it:
  • Fig. 1 a schematic representation of an oxygen blowing lance;
  • Fig. 2 a schematic representation of an oxygen supply with intermediate cooling and with a for refining a molten steel arranged in a converter lance with single-hole lance tip;
  • Fig. 3 a schematic representation of an oxygen lance with Mehrioch lance tip;
  • Fig. 4 a schematic representation of an oxygen supply with Gasphasenabschelder and with a arranged for refining a molten steel in a converter lance with Mehrioch lance tip.

In der Fig. 1 ist eine zum Einblasen von gasförmigem und flüssigem Sauerstoff in eine - bildlich nicht dargestellte - Stahlschmelze einsetzbare Vorrichtung dargestellt.In the Fig. 1 is a device for injecting gaseous and liquid oxygen in a - not graphically represented - molten steel device shown.

Die Sauerstoff-Blasvorrichtung besteht aus einer Blaslanze 1, über deren mit einer Wasserkühlung 2 ummantelten Zuströmkanal 3, gasförmiger Sauerstoff (GOX) durch eine Ausströmdüse 4 als gasförmiger Sauerstoff-Strahl 5 der Stahlschmelze zugeführt wird.The oxygen blowing device consists of a blowing lance 1, via whose with a water cooling 2 encased inflow channel 3, gaseous oxygen (GOX) is supplied through a discharge nozzle 4 as a gaseous oxygen jet 5 of the molten steel.

Die Sauerstoff-Blasvorrichtung weist zudem eine weitere, im Zuströmkanal 3 der Blaslanze 1 zentrisch angeordnete LOX-Lanze 6 auf, über deren mit einer Wärmeisolierung 7 versehenen Zuströmkanal 8 tiefkalter flüssiger Sauerstoff (LOX) durch eine Ausströmdüse 9 als - vom Gasstrahl 5 umhüllter - zentrischer Strahl 10 flüssigen Sauerstoffs der Stahlschmelze zugeführt werden kann.The oxygen blowing device also has a further, in the inflow channel 3 of the lance 1 centrically arranged LOX lance 6, on their provided with a thermal insulation 7 inflow channel 8 cryogenic liquid oxygen (LOX) through a discharge 9 as - from the gas jet 5 enveloped - centric Beam 10 liquid oxygen of the molten steel can be supplied.

Der durch die Ausströmdüse 4 der Blaslanze 1 als Strahl 5 gasförmigen Sauerstoffs auf die Oberfläche der In einem Konverter befindlichen Stahlschmelze auftreffende Gasstrahl 5 durchdringt mittels seiner Impulsenergle die auf der Stahlschmelze befindliche Schlacke, wodurch im Auftreffbereich des gasförmigen Sauerstoff-Strahle 5 die Oberfläche der Stahlschmelze von der Schlacke befreit und in der Stahlschmelze Oxidationereaktionen bewirkt werden.The gas jet 5 impinging on the surface of the molten steel located in a converter through the exhaust nozzle 4 of the lance 1 penetrates the slag on the molten steel, whereby the surface of the molten steel of .mu. In the area of impact of the gaseous oxygen jet 5 the slag freed and caused in the molten steel oxidation reactions.

Der durch die Ausströmdüse 9 der LOX-Lanze 6 als - vom Gasstrahl 5 umhüllter - zentrischer Strahl 10 flüssigen Sauerstoffs der Stahlschmelze zugeführte Strahl 10 trifft auf die vom Gasstrahl 5 von der Schlacke befreite Oberfläche der Stahlschmelze und verdampft bei seinem Eindringen in das In seinem Brennfleck hohe Temperaturen aufweisende Schmelzbad schlagartig, wodurch eine intensive Badbewegung bewirkt wird und damit ein verstärkter Stoffaustausch in der Stahlschmelze - nämlich die Oxidation des Kohlenstoffs zu Kohlenmonoxid, sowie die Verschlackung der Rohelsenbegletter Silizium und Mangan - stattfindet.The jet 10 supplied through the discharge nozzle 9 of the LOX lance 6 as the liquid jet of liquid molten steel supplied to the steel melt strikes the surface of the molten steel freed from the slag by the gas jet and evaporates as it enters the focal spot high-temperature molten bath abruptly, whereby an intensive bath movement is effected and thus an increased mass transfer in the molten steel - namely, the oxidation of the carbon to carbon monoxide, and the slagging of Rohelsenbegletter silicon and manganese - takes place.

Der Strahl 10 flüssigen Sauerstoffs wird den jeweiligen Strömungsverhältnissen und der Reynoldszahl angepasst und kann entweder als homogener Flüssigkeitsstrahl oder als Tröpfchenstrahl dem Schmelzbad zugeführt werden.The jet 10 of liquid oxygen is adapted to the respective flow conditions and the Reynolds number and can be supplied to the molten bath either as a homogeneous liquid jet or as a droplet jet.

Die Ausbildung des Strahls 10 flüssigen Sauerstoffs kann durch den Grad seiner Unterkühlung beeinflusst werden.The formation of the jet of liquid oxygen may be influenced by the degree of its supercooling.

Die das vorzeitige Verdampfen des den Zuströmkanal 8 der Blaslanze 6 durch-fließenden flüssigen Sauerstoffs (LOX) verhindernde Wärmeisolierung 7 besteht aus aus einem üblichen Isolationsmaterial.The premature evaporation of the inflow channel 8 of the lance 6 flowing through liquid oxygen (LOX) preventing thermal insulation 7 consists of a conventional insulation material.

Der Strahl 10 flüssigen Sauerstoffs kann auch intermittierend der Stahlschmelze zugeführt werden.The jet 10 of liquid oxygen may also be fed intermittently to the molten steel.

In Fig. 2 Ist eine - gemäß Fig. 1 ausgebildete - Einbch-Blasianze 11 schematisch dargestellt, aus welcher ein - von einem Strahl 5 gasförmigen Sauerstoffs umhüllter, zentrischer Strahl flüssigen Sauerstoffs 10 im Bereich des von Schlacke 12 befreiten flüssigen Stahlbads 13 eines Konverters 14 auftrifft. Die Zufuhr des als Frischmittel eingesetzten flüssigen Sauerstoffs (LOX) von einer Flüssigsauerstoff-Versorgung 15 In die mit einem Kühtwasseranschluss 16 ausgerüstete Einloch-Blaslanze 11 erfolgt durch eine als flexibler Schlauch ausgebildete Leitung 17. Die Zufuhr des ebenfalls als Frischmittel eingesetzten gasförmigen Sauerstoffs (GOX) erfolgt von einer üblichen, nicht näher bezeichneten Sauerstoffgas-Versorgung in die Blasianze 11 durch eine, vorteilhaft als flexibler Schlauch ausgebildeten Leitung 18.In Fig. 2 Is one - according to Fig. 1 formed - Einbch-Blasianze 11 shown schematically from which a - coated by a jet of gaseous oxygen, centric jet of liquid oxygen 10 in the region of liberated from slag 12 liquid steel bath 13 of a converter 14 impinges. The supply of the liquid oxygen (LOX) used as a fresh medium from a liquid oxygen supply 15 into the one-hole blow lance 11 equipped with a cooling water connection 16 takes place through a line 17 designed as a flexible hose. The supply of the gaseous oxygen (GOX) likewise used as a fresh medium takes place from a customary, unspecified oxygen gas supply into the Blasianze 11 by a, advantageously designed as a flexible hose line 18th

Die aus der DE 43 15 342 C1 bekannte Flüssigsauerstoff-Versorgung 15 besteht aus einem, mit üblichen und daher nicht näher bezeichneten Rohrleitungen und Ventilen ausgerüsteten Speicherbehälter 19 für flüssigen Sauerstoff. Der zum Frischen des Stahlbads 13 der im Konverter 14 angeordneten Einioch-Blaslanze 11 zugeführte flüssige Sauerstoff wird aus dem isollerten Speicherbehälter 19 durch eine Leitung 20 entnommen und - falls der Druck des Spetcherbehälters 19 nicht ausreicht - nach einem Absperrventil 21 über eine Flüssigsauersboffpumpe 22 auf den erforderlichen Druck erhöht und danach in einen Wärmeaustauscher 23 eingeleitet Die Leitung 20 kann zusätzlich mit einer - in der Zeichnung nicht dargestellten - Ummantelung mit einem kryogene Medium, beispielsweise Flüssigstickstoff versehen sein, um ein vorzeitiges Verdampfen des Sauerstoffs zu verhindern.The from the DE 43 15 342 C1 known liquid oxygen supply 15 consists of a, equipped with conventional and therefore unspecified pipes and valves storage container 19 for liquid oxygen. The fresh oxygen supplied to the steel bath 13 of the converter 14 arranged in the single-shot blower lance 11 is removed from the isollerten storage tank 19 through a line 20 and - if the pressure of the Spekerbehälters 19 is insufficient - after a shut-off valve 21 via a Flüssigigsauersboffpumpe 22 on the increased pressure and then introduced into a heat exchanger 23, the line 20 may additionally be provided with a - not shown in the drawing - sheath with a cryogenic medium, for example liquid nitrogen, to prevent premature evaporation of oxygen.

Zum Kühlen des als Frischmittel eingesetzten flüssigen Sauerstoffs in dem Wärmeaustauscher 23 wird von der isolierten Leitung 20 hinter dem Absperrventil 21 durch eine isolierte Leitung 24 abgezweigter Sauerstoff über ein mittels eines Fühlers 32 geregelten Füllstandsregelungssystem 25 in den Wärmeaustauscher 23 geleitet. Im Innem des Wärmeaustauschers 23 wird mittels einer Pumpe 26 ein solcher Unterdruck erzeugt, durch den die Siedetemperatur des als Kühlmittel im Wärmeaustauscher 23 eingesetzten flüssigen Sauerstoffs so gesenkt wird, dass dieser als Kühlmittel für den Frischsauerstoff dienen kann. Durch die Wahl des Unterdrucks kann die Temperaturdifferenz des Kühlsauerstoffes zum Frischseuerstoff und somit das Maß der Verhinderung der vorzeitigen Verdampfung des Flüseigsauerstoffs zum Frischen bestimmt werden.For cooling the liquid oxygen used as the fresh medium in the heat exchanger 23, branched off oxygen from the insulated line 20 behind the shut-off valve 21 through an insulated line 24 via a level control system 25 controlled by a sensor 32 in the heat exchanger 23. In the interior of the heat exchanger 23, a negative pressure is generated by means of a pump 26, by which the boiling temperature of the liquid oxygen used as a coolant in the heat exchanger 23 is lowered so that it can serve as a coolant for the fresh oxygen. By choosing the negative pressure, the Temperature difference of the cooling oxygen to Frischseuerstoff and thus the degree of prevention of premature evaporation of the liquid oxygen to be determined for freshness.

Der zum Frischen des Stahlbads 13 im Konverter 14 eingesetzte flüssige Sauerstoff wird in Kupferwendeln 27 durch den Wärmeaustauscher 23 geführt und dabei von dem ihn umgebenden Kühlsauerstoff - je nach vorliegendem Druckverhältnis - unter seine durch den Druck bestimmte Siedetemperatur gekühlt. Danach wird der flüssige Frischasuerstoff durch die als isolierter Schlauch ausgebildete Leitung 17 der in dem Konverter 14 angeordneten Einioch-Blasdüse 11 zugeführt - und zusammen mit dem über die Leitung 18 der Blaslanze 11 zugeführten gasförmigen Sauerstoff - in der vorab erläuterten Weise in das Stahlbad 13 des Konverters 14 eingeblasen.The liquid oxygen used for refining the steel bath 13 in the converter 14 is passed through the heat exchanger 23 in copper coils 27 and thereby cooled by the cooling oxygen surrounding it - depending on the prevailing pressure ratio - below its boiling temperature determined by the pressure. Thereafter, the liquid fresh aspirate is supplied through the formed as an insulated tube line 17 arranged in the converter 14 Einioch blow nozzle 11 - and together with the supplied via the line 18 of the lance 11 gaseous oxygen - in the manner previously explained in the steel bath 13 of Converter 14 blown.

In Fig. 3 ist eine Blaslanze 1 mit einer Drelloch-Lanzenspitze dargestellt, deren Ausführung grundsätzlich der in Fig. 1 beschriebenen Blaslanze 1 entspricht.In Fig. 3 a lance 1 with a Drelloch lance tip is shown, whose execution basically the in Fig. 1 described blowing lance 1 corresponds.

Im Unterschled zu der in Fig. 1 beschriebenen Blaslanze 1 ist die in Fig. 3 beschriebene Blaslanze 1 derart ausgebildet dass sowohl der flüssige Sauerstoff (LOX) als auch der gasförmige Sauerstoff (GOX) In der Lanzenspitze auf mehrere Teilstrahlen - gemäß Fig. 3 - in drei Teilstrahlen aufgeteilt wird.In Unterschled to the in Fig. 1 described blowing lance 1 is the in Fig. 3 Blaslanze 1 described in such a way that both the liquid oxygen (LOX) and the gaseous oxygen (GOX) In the lance tip to a plurality of partial beams - according to Fig. 3 - Divided into three sub-beams.

Die Aufteilung des gasförmigen Sauerstoffs erfolgt aus dem Zuströmkanal 3 für gasförmigen Sauerstoff auf die drel in der Lanzenspitze befindlichen Ausströmdüsen 4 für gasförmigen Sauerstoff.The division of the gaseous oxygen takes place from the inflow channel 3 for gaseous oxygen to the discharge nozzles 4 for gaseous oxygen located in the lance tip.

Die Aufteilung des flüssigen Sauerstoffs erfolgt durch die Aufteilung des Zuström-kanals 8 für flüssigen Sauerstoff auf drei - in Fig. 3 nicht gezeigte - Zuströmkanäle, die jeweils mit einer Ausströmdüse 9 für flüssigen Sauerstoff versehen sind.The division of the liquid oxygen is carried out by the division of the inlet channel 8 for liquid oxygen to three - in Fig. 3 not shown - inflow channels, which are each provided with a discharge nozzle 9 for liquid oxygen.

Wie weiterhin in Fig. 3 gezeigt, entströmen der Ausströmdüse/n 4 der Blaslanze 1 der Strahl 10 flüssigen Sauerstoffs und der den Strahl 10 flüssigen Sauerstoffs umhüllende Strahl 5 gasförmigen Sauerstoffs mit einem - für Mehrioch-Lanzen-spitzen üblichen - Neigungswinkel zur Lanzenachse zum Frischen der Stahlschmelze. Bei der in Fig. 3 dargestellten Blaslanze 1 beträgt dieser Winkel 25°.As continues in Fig. 3 shown, the Ausströmdüse / n 4 of the lance 1 of the stream 10 of liquid oxygen and the jet of liquid oxygen 10 enveloping jet of gaseous oxygen flow with a - for multi-hole lance tips usual - Inclination angle to the lance axis for refining the molten steel. At the in Fig. 3 illustrated lance 1, this angle is 25 °.

In Fig. 4 ist eine, mit ihrer Mehrloch-Lanzenspitze in einem Konverter 14 ange-ordnete Mehrloch-Biaslanze 28 schematisch dargestellt, aus welcher mehrere, jeweils von einem Strahl 5 gasförmigen Sauerstoffs umhüllte, zentrische Strahlen 10 flüssigen Sauerstoffs im Bereich des von Schlacke 12 befreiten flüssigen Stahlbads 13 des Konverters 14 auftreffen. Die Zufuhr das flüssigen Sauerstoffs (LOX) aus einer Flüssigsauerstoff-Versorgung 29 in die mit einem Kühlwassersanschluss 18 und mit einer Mehrioch-Lanzenspitze ausgerüsteten, in dem Konverter 14 angeordneten Mehrloch-Blaslanze 28 erfolgt durch die Isollerte Leitung ist in Form eines flexiblen Schlauchs. Die Zufuhr des gasförmigen Sauerstoffs (GOX) von einer üblichen und daher nicht näher bezeichneten Sauerstoffgas-Vemorgung in die Mehrioch-Blaslanze 28 erfolgt durch die Leitung 18.In Fig. 4 is a, with its multi-hole lance tip in a converter 14 arranged multi-hole biasing lance 28 schematically shown, from which several, each of a beam 5 of gaseous oxygen enveloped, centric beams 10 liquid oxygen in the region of liberated from slag 12 liquid steel bath thirteenth of converter 14. The supply of liquid oxygen (LOX) from a liquid oxygen supply 29 into the multi-hole lance 28, which is equipped with a cooling water connection 18 and with a multi-hole lance tip and is arranged in the converter 14, takes place in the form of a flexible hose. The supply of the gaseous oxygen (GOX) from a customary and therefore unspecified oxygen gas supply into the multi-hole lance 28 takes place through the line 18.

Aus dem - gemäß Fig. 2 ausgebildeten - Speicherbehälter 19 der Flüssigsauerstoff-Versorgung 29 wird der flüssige Sauerstoff (LOX) durch die Entnahmeleitung 20 über ein Absperventil 21 durch eine isolierte Leitung 30 einem Gasphesenabscheider 31 zugeführt. Ein Füllshandsregelungssystem 25 hält den zum Frischen eingesetzten flüssigen Sauerstoff im Gasphasenabscheider 31 automatisch auf dem gewünschten Niveau, wozu mittels eines Fühlers 32 der Füllstand des flüssigen Sauerstoffs im Gasphasenabscheider 31 erfasst wird.From the - according to Fig. 2 formed - storage tank 19 of the liquid oxygen supply 29, the liquid oxygen (LOX) is supplied through the withdrawal line 20 via a shut-off valve 21 through an insulated line 30 a gas vapor separator 31. A Füllshandsregelungssystem 25 automatically holds the used for refining liquid oxygen in the gas phase separator 31 at the desired level, for which by means of a sensor 32, the level of liquid oxygen in the gas phase separator 31 is detected.

In dem Gasphasenabschelder 31 wird der gasförmlge Sauerstoff von dem flüssigen Sauerstoff getrennt. Der flüssige Sauerstoff (LOX) wird über die als isolierter Schlauch ausgebildete Leitung 17 der in dem Konverter 14 angeordneten Mehrloch-Blaslanze 28 zugeführt und mittels dieser - zusammen mit dem über die Leitung 18 zugeführten gasförmige Sauerstoff - In vorab erläuterter Weise zum Frischen des Stahlbads 13 im Konverter 14 eingesetzt.In the gas phase scraper 31, the gaseous oxygen is separated from the liquid oxygen. The liquid oxygen (LOX) is supplied via the formed as an insulated tube line 17 of the arranged in the converter 14 multi-hole lance 28 and by means of this - together with the supplied via the line 18 gaseous oxygen - in an above-explained manner for refining the steel bath thirteenth used in the converter 14.

Der durch äußeren Wärmeeintrag in den flüssigen Sauerstoff entstehende gasförmige Sauerstoffanteil wird durch den Gasphasenabscheider 31 vor der Mehrloch-Blaedüse 28 separiert und über eine - das Füllstanderegedungwystern 26 enthaltenden - Leitung 33 anderen, nicht näher bezeichneten Verbrauchern zugeführt.The gaseous oxygen content resulting from the external introduction of heat into the liquid oxygen is separated by the gas phase separator 31 Multi-hole Blaedüse 28 separated and fed via a - the Füllstanderegedungwystern 26 containing - line 33 other unspecified consumers.

Dem zum Frischen von Stahl eingesetzten flüssigen und gasförmigen Sauerstoff können bei Bedarf auch andere Medien, wie z.B. Argon oder Feststoffe, beigefügt werden.If necessary, other media, such as argon or solids, may be added to the liquid and gaseous oxygen used to refine steel.

Bezugszeichenreference numeral

11
Blaslanze (GOX + LOX)Blowgun (GOX + LOX)
22
Wasserkühlungwater cooling
33
Zuströmkanal (GOX)Inflow channel (GOX)
44
Ausströmdüse (GOX)Exhaust nozzle (GOX)
55
Strahl (GOX)Beam (GOX)
66
LOX-LanzeLOX-lance
77
Wärmeisolierungthermal insulation
88th
Zuströmkanal (LOX)Inflow channel (LOX)
99
Ausströmdüse (LOX)Exhaust nozzle (LOX)
1010
Strahl (LOX)Beam (LOX)
1111
Einloch-BlaslanzeSingle-hole lance
1212
Schlackeslag
1313
StahlbadStahlbad
1414
Konverterconverter
1515
Flüssigsauerstoff-Versorgung (LOX)Liquid Oxygen Supply (LOX)
1616
KühlwasseranschlussCooling water connection
1717
LOX Leitung (Schlauch)LOX pipe (hose)
1818
GOX Leitung (Schlauch)GOX pipe (hose)
1919
Speicherbehälter (LOX)Storage tank (LOX)
2020
Leitung (LOX)Line (LOX)
2121
Absperrventilshut-off valve
2222
FlüssigsauerstoffpumpeLiquid oxygen pump
2323
Wärmeaustauscherheat exchangers
2424
Leitungmanagement
2525
FüllstandsregelungssystemLevel control system
2626
Pumpepump
2727
Kupferwendelncopper coils
2828
Mehrloch-BlaslanzeMulti-hole lance
2929
Flüssigsauerstoff-Versorgung (LOX)Liquid Oxygen Supply (LOX)
3030
Leitung (LOX)Line (LOX)
3131
GasphasenabscheiderGasphasenabscheider
3232
Fühlersensor
3333
Leitung (GOX)Line (GOX)

Claims (6)

  1. Method for treating metal melts, in particular steel melts, with a refining agent comprising oxygen, wherein, a compact jet (10) of liquid oxygen, surrounded by a jet (5) of gaseous oxygen and guided therein, is introduced into and/or applied onto the metal melt, wherein the jet (5) of gaseous oxygen removes slag from the surface of the metal melt in its impingement zone and is released by an outflow nozzle (4), in the inflow passage (3) of which a further outflow nozzle (9) for discharging the jet (10) of liquid oxygen is arranged centrally.
  2. Method according to Claim 1, characterized in that the jets (5, 10) of gaseous and liquid oxygen are used at the same velocity.
  3. Method according to Claim 1, characterized in that the jets (5, 10) of gaseous and liquid oxygen are used at different velocities.
  4. Method according to one of Claims 1 to 3, characterized in that the jet (10) of liquid oxygen is used continuously.
  5. Method according to one of Claims 1 to 3, characterized in that the jet (10) of liquid oxygen is used intermittently.
  6. Method according to one of Claims 1 to 5, characterized in that argon in liquid form is fed in, in addition to the liquid oxygen, to purify and homogenize the metal melt.
EP04741571A 2003-05-23 2004-05-13 Method for treating melt metals by means of a refining oxygen-based agent Active EP1636390B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL04741571T PL1636390T3 (en) 2003-05-23 2004-05-13 Method for treating melt metals by means of a refining oxygen-based agent
SI200431758T SI1636390T1 (en) 2003-05-23 2004-05-13 Method for treating melt metals by means of a refining oxygen-based agent

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10323826A DE10323826A1 (en) 2003-05-23 2003-05-23 Method and device for treating molten metals, in particular molten steel, with a fresh medium of oxygen
PCT/EP2004/050800 WO2004104231A2 (en) 2003-05-23 2004-05-13 Method and device for treating melt metals by means of a refining oxygen-based agent

Publications (2)

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EP1636390A2 EP1636390A2 (en) 2006-03-22
EP1636390B1 true EP1636390B1 (en) 2011-07-06

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AT (1) ATE515581T1 (en)
DE (1) DE10323826A1 (en)
ES (1) ES2369362T3 (en)
PL (1) PL1636390T3 (en)
SI (1) SI1636390T1 (en)
WO (1) WO2004104231A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009022208B4 (en) * 2009-05-20 2013-03-28 Messer Group Gmbh Process for treating molten metals
DE102014015660A1 (en) * 2014-10-23 2016-04-28 Messer Austria Gmbh Method and device for heating a furnace chamber using a multi-fuel burner
CN107815583A (en) * 2017-11-07 2018-03-20 西峡县众德汽车部件有限公司 A kind of method of smelting, turbine shroud and its method of smelting
DE102018208433A1 (en) * 2018-05-29 2019-12-05 Sms Group Gmbh Oxygen injector for a converter, in particular for steel production

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Publication number Priority date Publication date Assignee Title
JPS596311A (en) * 1982-07-01 1984-01-13 Kawasaki Steel Corp Blowing process for converter
DE4315342C1 (en) * 1993-05-08 1994-02-24 Messer Griesheim Gmbh Treating molten metal, in partic. steel with a purifying agent - with liquid oxygen or a two=phase mixt. of liq and gaseous oxygen used as the purifying agent
JPH08199220A (en) 1995-01-30 1996-08-06 Kawasaki Steel Corp Blowing method by top blowing converter and top blowing lance used therewith
JPH08246021A (en) 1995-03-07 1996-09-24 Nippon Steel Corp Lance nozzle for blowing-in converter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 6, 1968 Derwent World Patents Index; Page 662, F.A. BROCKHAUS WIESBADEN: "Brockhaus Enzyklopädie" *

Also Published As

Publication number Publication date
EP1636390A2 (en) 2006-03-22
ES2369362T3 (en) 2011-11-29
DE10323826A1 (en) 2005-01-05
WO2004104231A3 (en) 2005-03-03
WO2004104231A2 (en) 2004-12-02
PL1636390T3 (en) 2011-12-30
SI1636390T1 (en) 2012-01-31
ATE515581T1 (en) 2011-07-15

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