EP0861337B1 - Method for decarburizing steels melts - Google Patents
Method for decarburizing steels melts Download PDFInfo
- Publication number
- EP0861337B1 EP0861337B1 EP96938974A EP96938974A EP0861337B1 EP 0861337 B1 EP0861337 B1 EP 0861337B1 EP 96938974 A EP96938974 A EP 96938974A EP 96938974 A EP96938974 A EP 96938974A EP 0861337 B1 EP0861337 B1 EP 0861337B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- vessel
- decarburisation
- fuel
- decarburization
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000155 melt Substances 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 title description 13
- 239000010959 steel Substances 0.000 title description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 239000000161 steel melt Substances 0.000 claims abstract 2
- 239000000446 fuel Substances 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 2
- 239000008187 granular material Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 238000005261 decarburization Methods 0.000 description 25
- 238000010438 heat treatment Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
- F27D2003/169—Construction of the lance, e.g. lances for injecting particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0075—Regulation of the charge quantity
Definitions
- the invention relates to a process for the decarburization of molten steel in a closed metallurgical vessel connected to a vacuum system and into the Oxygen can be introduced via a lance and combustible materials via a feed device are.
- EP 0 110 809 describes a method for Treatment of steel in the pan by means of reactive slags is known in which one metallothermal reaction is provided, with the help of a lance oxygen in a the melt immersed bell is blown in, flammable metallic substances underneath Formation of reactive slags react and below the pipe in which the steel treatment takes place, a neutral or reducing purge gas is injected.
- EP 0 347 884 B1 discloses a process for degassing and decarburizing molten steel, in which steel has led from a container into a vacuum chamber and an oxygen lance is arranged in the vacuum chamber at a given distance, from which oxygen or oxygen-containing gas is used Combustion of the CO is inflated near the surface of the molten steel in the vacuum chamber. Taking into account a predetermined ratio of (CO + CO 2 ) / exhaust gas amount or CO / (CO + CO 2 ), oxygen or an oxygen-containing gas is supplied through a CO combustion lance near the surface of the molten steel located in the vacuum chamber .
- This process does not show the melt at certain pressure conditions heat up chemically and inflate with a defined excess amount of oxygen.
- the aim of the invention is to provide a method for decarburizing a molten steel create the decarburization time while realizing a high degree of oxide purity shortened and / or the final carbon content is reduced.
- this is carried out in addition to that during the decarburization phase of the supplementary oxygen used in the carbon degradation, further oxygen is blown in and at the same time added metallic fuel.
- the chemical heating agent for example in the form of aluminum powder, can be used in a special way to accelerate decarburization.
- the reaction kinetics are influenced by the Al 2 O 3 particles formed during heating. These deoxidation products act as foreign germs and can therefore force the decarburization rate, especially through the formation of CO bubbles.
- a combination lance is used in which the oxygen and the metallic fuels are promoted.
- these through a separate tube Feed the vessel.
- any partial temperature increase during a Decarburization can be realized under vacuum.
- This has the advantage of being typical Temperature losses such as due to insufficiently preheated treatment vessels or steel pans and due to delays due to transportation or extended To compensate for treatment times.
- FIG. 1 shows a vacuum vessel 43 provided with a lid 44, which has a Suction line 42 is connected to a vacuum system 41.
- a vacuum vessel there is a metallurgical vessel 10 which has a jacket 12 which with a refractory lining 13 is provided inside.
- the vessel is with melt S filled.
- a measuring lance 28 and a combination lance 31 protrude through the cover 44.
- the combination lance 31 has a feed line 32 for oxygen and a feed line 33 for metallic fabrics.
- a barrier 34 and on the Supply line 33 is provided with a shut-off 35.
- the barriers 34 and 35 have Control units 23, 25 on the control lines 24, 26 with a measuring and Control device 22 are connected.
- This measuring and control device 22 is a Measuring line 27 with a measuring element 21 provided on the measuring lance 28 for Measurement of the temperature T and a measuring element 29 for measuring the in the vessel space prevailing pressure P.
- FIG Melt An open metallurgical vessel 10 is used in FIG Melt is filled, with a tube feed 46 and a in the melt Immerse the pipe outlet 47 of an RH vessel 45.
- the RH vessel is over one Suction line 42 connected to a vacuum system 41.
- Combination lance 31 protrudes into the RH vessel for the supply of particularly coarse Solids into a pipe 38 which is closed by a shut-off 37 with a container 36 in Connection is established.
- the measuring and regulating and the control device is as in the Figure 1 trained.
- FIG. 3 shows a vessel 10 which is closed by a lid 15, the one Bell 14 has the mouth side into the melt S located in the vessel 10 immersed.
- the Sautechnisch 42 connected to the vacuum 41 is designed so that a lockable branch is provided, once to the bell 14 with the Barrier 48 and to cover 15 with barrier 49.
- the measuring and regulating device as well as the control device are as in the Figures 1 or 2 designed.
- the temperature measuring element 21 is through the metallic jacket 12 of the vessel 10 led deep into the refractory lining 13.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Entkohlung von Stahlschmelzen in einem geschlossenen metallurgischen Gefäß, das an eine Vakuumanlage angeschlossen ist und in das über eine Lanze Sauerstoff sowie über eine Zufuhreinrichtung brennbare Stoffe einführbar sind.The invention relates to a process for the decarburization of molten steel in a closed metallurgical vessel connected to a vacuum system and into the Oxygen can be introduced via a lance and combustible materials via a feed device are.
Ein derartiges Verfahren ist aus dem "Patent Abstract of Japan, vol 002, no117 (C-023),29.09.78, & Derwent Abstract 78-61015A & JP-A-53081418" und aus der FR-A-2130350 bekannt.Such a method is known from the "Patent Abstract of Japan, vol 002, no117 (C-023), 29.09.78, & Derwent Abstract 78-61015A & JP-A-53081418 "and known from FR-A-2130350.
Bei der sogenannten Forced Decarburizadion ist es bekannt, Sauerstoff während der Entkohlungsphase zuzusetzen. Dieser Sauerstoffzusatz ist immer dann erforderlich, wenn der im Stahl vorhandene Sauerstoff zur Entkohlung nicht ausreicht, bzw. so niedrig ist, daß der erforderliche C-Abbau nicht in der zur Verfügung stehenden Zeit abgeschlossen ist. Bei einem solchen Verfahren werden beispielsweise Tauchrohre eines RH-Gefäßes in die Schmelze eingetaucht. Mit Start des Druckabbaus im RH-Gefäß startet der Entkohlungsprozeß gleichzeitig in Abhängigkeit mit der Druckabsenkung. Bei einem erreichten Unterdruck von p < 100 mbar wird die Sauerstofflanze gestartet und O2 etwa 1 bis 3 min. geblasen. Während der Tiefvakuumphase findet die Selbstentkohlung statt, die Entkohlung wird beendet. nach der Desoxidation.With the so-called forced decarburizadione, it is known to add oxygen during the decarburization phase. This addition of oxygen is always necessary when the oxygen in the steel is not sufficient for decarburization or is so low that the required C-degradation is not completed in the time available. In such a method, for example, dip tubes of an RH vessel are immersed in the melt. With the start of pressure reduction in the RH vessel, the decarburization process starts at the same time as the pressure drops. When a vacuum of p <100 mbar is reached, the oxygen lance is started and O 2 for about 1 to 3 minutes. blown. Self-decarburization takes place during the low vacuum phase and decarburization is ended. after deoxidation.
Während der Entkohlung werden bis zu 70 % CO gebildet. Ein Teil dieses Gases reagiert automatisch mit Teilen des zugesetzten Sauerstoffs zu CO2. Der Nachverbrennungsgrad ist bei dieser Fahrweise kleiner 30 %. Up to 70% CO is formed during decarburization. Part of this gas reacts automatically with parts of the added oxygen to CO 2 . The degree of afterburning is less than 30% with this driving style.
Weiterhin ist es hüttenmännische Praxis, zum chemischen Aufheizen von Stahlschmelzen in atmosphärischen Anlagen Aluminium einzusetzen. Bei diesem chemischen Heizen wird der Energiegewinn, der aus der Verbrennung des Aluminiums mit dem zugesetzten Sauerstoff resultiert, zum Aufheizen der Schmelze ausgenutzt.Furthermore, it is metallurgical practice for the chemical heating of molten steel in atmospheric systems use aluminum. With this chemical heating the Energy gain from the combustion of the aluminum with the added oxygen results, used to heat the melt.
Neben dem reinen thermischen Heizen mit Aluminium kann dieses mit anderen Stoffen zur Behandlung der Schmelze eingesetzt werden. So ist aus EP 0 110 809 ein Verfahren zur Behandlung von Stahl in der Pfanne mittels reaktiven Schlacken bekannt, bei der eine metallothermische Reaktion vorgesehen ist, wobei mit Hilfe einer Lanze Sauerstoff in ein in die Schmelze eingetauchte Glocke eingeblasen wird, brennbare metallische Stoffe unter Bildung reaktiver Schlacken reagieren und unterhalb des Rohres, in welchem die Stahlbehandlung stattfindet, ein neutrales oder reduzierendes Spülgas eingeblasen wird.In addition to pure thermal heating with aluminum, this can be done with other materials Treatment of the melt can be used. EP 0 110 809 describes a method for Treatment of steel in the pan by means of reactive slags is known in which one metallothermal reaction is provided, with the help of a lance oxygen in a the melt immersed bell is blown in, flammable metallic substances underneath Formation of reactive slags react and below the pipe in which the steel treatment takes place, a neutral or reducing purge gas is injected.
Nachteil dieses Verfahrens zur Entschweflung-, Desoxidation- und Reinigungsreaktion von Stahlschmelzen ist die Bildung der reaktiven Schlacken, die in der in das flüssige Metall eingetauchte Glocke stattfinden sollen.Disadvantage of this method for the desulfurization, deoxidation and purification reaction of Steel melting is the formation of the reactive slags that are immersed in the liquid metal Bell should take place.
Weiterhin ist aus der EP 0 347 884 B1 ein Verfahren zum Entgasen und Entkohlen von erschmolzenem Stahl bekannt, bei dem Stahl aus einem Behälter in eine Vakuumkammer geführt hat und in der Vakuumkammer im gegebenen Abstand eine Sauerstofflanze angeordnet ist, aus der Sauerstoff oder sauerstoffhaltiges Gas zur Verbrennung des CO in der Nähe der Oberfläche des in der Vakuumkammer befindlichen erschmolzenen Stahls aufgeblasen wird. Unter Berücksichtigung eines vorgegebenen Verhältnisses von (CO + CO2)/Abgasmenge bzw. CO/(CO + CO2) wird Sauerstoff oder ein sauerstoffhaltiges Gas durch eine Lanze zur Verbrennung von CO in der Nähe der Oberfläche des in der Vakuumkammer befindlichen erschmolzenen Stahls zugeführt.Furthermore, EP 0 347 884 B1 discloses a process for degassing and decarburizing molten steel, in which steel has led from a container into a vacuum chamber and an oxygen lance is arranged in the vacuum chamber at a given distance, from which oxygen or oxygen-containing gas is used Combustion of the CO is inflated near the surface of the molten steel in the vacuum chamber. Taking into account a predetermined ratio of (CO + CO 2 ) / exhaust gas amount or CO / (CO + CO 2 ), oxygen or an oxygen-containing gas is supplied through a CO combustion lance near the surface of the molten steel located in the vacuum chamber .
Diesem Verfahren ist nicht zu entnehmen, die Schmelze bei bestimmten Druckverhältnissen chemisch aufzuheizen und mit einer definierten Überschußmenge an Sauerstoff aufzublasen.This process does not show the melt at certain pressure conditions heat up chemically and inflate with a defined excess amount of oxygen.
Die Erfindung hat sich das Ziel gesetzt, ein Verfahren zur Entkohlung einer Stahlschmelze zu schaffen, bei dem unter Realisierung eines hohen oxidischen Reinheitsgrades die Entkohlungszeit verkürzt und/oder der Endkohlenstoffgehalt vermindert wird. The aim of the invention is to provide a method for decarburizing a molten steel create the decarburization time while realizing a high degree of oxide purity shortened and / or the final carbon content is reduced.
Die Erfindung erreicht dieses Ziel mit den Merkmalen des Patentanspruchs 1.The invention achieves this aim with the features of patent claim 1.
Erfindungsgemäß wird zusätzlich zu dem während der Entkohlungsphase zur Durchführung des Kohlenstoffabbaus eingesetzten Ergänzungssauerstoffs weiterer Sauerstoff eingeblasen und gleichzeitig metallischer Brennstoff verteilt zugegeben.According to the invention, this is carried out in addition to that during the decarburization phase of the supplementary oxygen used in the carbon degradation, further oxygen is blown in and at the same time added metallic fuel.
In bekannten Vakuumanlagen wurden bisher ausschließlich beruhigt vergossene (Al, Si oder Al-Si-Desoxidation) Schmelzen bzw. unberuhigt vergossene Schmelzen (Entkohlungsschmelzen) nach erfolgter Entkohlung und anschließender Desoxidation chemisch aufgeheizt. Die Begründung war die Erniedrigung des zur Entkohlung erforderlichen Sauerstoffs beim Zusatz des Heiz-Aluminiums. Ausgenutzt wird der Energiegewinn, der bei der Reaktion aus der Verbrennung des Aluminiums mit dem zugesetzten Sauerstoff resultiert. Bei diesem Verfahren wurde aber die Entkohlungsreaktion stark gebremst und der zu erwartende Entkohlungssauerstoff wurde nicht erreicht.In known vacuum systems, cast (Al, Si or Al-Si deoxidation) Melting or poured-out casts (decarburization melts) chemically heated after decarburization and subsequent deoxidation. The reason was the lowering of the oxygen required for decarburization Addition of the heating aluminum. The energy gained from the reaction is used combustion of the aluminum with the added oxygen results. With this procedure However, the decarburization reaction was slowed down considerably and the expected decarburization oxygen was not reached.
Erfindungsgemäß wird dieser Nachteil umgangen und der während der Entkohlung eintretende Temperaturverlust durch den Heizvorgang mit Aluminium oder ähnlichen Produkten wird kompensiert. Bei dem vorgeschlagenen Sauerstoffzusatz kommt es zu einem zeitlich begrenzten partiellen Sauerstoffüberschuß in der Schmelze. Partieller Sauerstoffüberschuß ist der zusätzliche Sauerstoff, der während der Entkohlung unberuhigt vergossenen Schmelzen in Vakuumanlagen zum Verbrennen metallischer Brennstoffe bzw. Brennstoffgemische zusätzlich benötigt, ohne den Entkohlungsprozeß nachteilig zu beeinflußen. Dieser Überschuß zeigt positive thermodynamische und kinetische Effekte und fördert in überraschender Weise den Entkohlungsprozeß. Bei der Entkohlungsreaktion [C] + [O] = (CO), die nicht nur stark druckabhängig sondern auch im besonderen Maße temperaturabhängig ist, wird dadurch beschleunigt, daß die beim chemischen Heizen kurzzeitig anstehende starke Überhitzung einer Teilschmelze insbesondere im RH-Gefäß sich katalytisch auf die Entkohlungsreaktion auswirkt.According to the invention, this disadvantage is avoided and that which occurs during the decarburization Temperature loss due to the heating process with aluminum or similar products is compensated. With the proposed addition of oxygen there is a temporal limited partial excess of oxygen in the melt. There is a partial excess of oxygen the additional oxygen that melts during the decarburization in vacuum systems for burning metallic fuels or fuel mixtures additionally needed without adversely affecting the decarburization process. That surplus shows positive thermodynamic and kinetic effects and surprisingly promotes the decarburization process. In the decarburization reaction [C] + [O] = (CO), which is not only strong is pressure-dependent but also temperature-dependent to a particular extent accelerates that the strong pending for a short time during chemical heating Overheating of a partial melt, especially in the RH vessel, catalytically affects the Decarburization reaction affects.
Weiterhin kann in besonderer Weise das chemische Aufheizmittel, beispielsweise in Form von Aluminiumgrieß für die Beschleunigung der Entkohlung benutzt werden. Neben dem thermodynamischen Effekt wird nämlich die Reaktionskinetik durch die beim Heizen gebildeten Al2O3-Partikel beeinflußt. Diese Desoxidationsprodukte wirken als Fremdkeime und können somit forcierend auf die Entkohlungsgeschwindigkeit, insbesondere durch die Bildung von CO-Blasen, wirken.Furthermore, the chemical heating agent, for example in the form of aluminum powder, can be used in a special way to accelerate decarburization. In addition to the thermodynamic effect, the reaction kinetics are influenced by the Al 2 O 3 particles formed during heating. These deoxidation products act as foreign germs and can therefore force the decarburization rate, especially through the formation of CO bubbles.
In einer vorteilhaften Ausgestaltung wird eine Kombinationslanze eingesetzt, bei der der Sauerstoff und die metallischen Brennstoffe gefördert werden. Bei besonders grobkörnigen Stoffen wird vorgeschlagen, diese durch ein gesondertes Rohr dem Gefäß zuzuführen.In an advantageous embodiment, a combination lance is used in which the oxygen and the metallic fuels are promoted. With especially Coarse-grained substances are suggested, these through a separate tube Feed the vessel.
Mit diesem Verfahren kann jede partielle Temperatur-Zunahme während einer Entkohlung unter Vakuum realisiert werden. Dies hat den Vorteil, typische Temperaturverluste wie z.B. durch ungenügend vorgewärmte Behandlungsgefäße bzw. Stahlpfannen und durch Verzögerungen infolge Transport- oder verlängerte Behandlungszeiten zu kompensieren.With this method, any partial temperature increase during a Decarburization can be realized under vacuum. This has the advantage of being typical Temperature losses such as due to insufficiently preheated treatment vessels or steel pans and due to delays due to transportation or extended To compensate for treatment times.
Mit gezieltem chemischen Aufheizen der Entkohlungsschmelzen während der Entkohlungsphase können die Konverter- oder UHP-Abstichtemperaturen gesenkt werden. Dies führt:
- bei Konvertern zu
- höheren Konverterhaltbarkeiten
- hohe Variabilität im festen Schrotteinsatz
- kürzeren Tap to tap-Zeiten
- bei Elektro-Lichtbogenöfen zu
- kürzeren Tap to tap-Zeiten
- geringerer spezifischer Elektroden-Verbrauch
- geringerem spezifischen Energieverbrauch
- with converters too
- higher converter durability
- high variability in fixed scrap use
- shorter tap to tap times
- with electric arc furnaces
- shorter tap to tap times
- lower specific electrode consumption
- lower specific energy consumption
Das vorgeschlagene Verfahren läßt sich bei verschiedensten Gefäßformen anwenden, wie im folgenden Beispiel der beiliegenden Zeichnung dargelegt. Dabei zeigen:
- Figur 1
- Die Behandlung in einem Vakuumgefäß.
- Figur 2
- Die Behandlung in einem RH-Gefäß.
- Figur 3
- Die Behandlung in einer geschlossenen Pfanne.
- Figure 1
- Treatment in a vacuum vessel.
- Figure 2
- Treatment in an RH vessel.
- Figure 3
- Treatment in a closed pan.
Die Figur 1 zeigt ein mit einem Deckel 44 versehenes Vakuumgefäß 43, das über eine
Saugleitung 42 an eine Vakuumanlage 41 angeschossen ist. Im Vakuumgefäß
befindet sich ein metallurgisches Gefäß 10, das einen Mantel 12 aufweist, der mit
einer Feuerfestauskleidung 13 innen versehen ist. Das Gefäß ist mit Schmelze S
gefüllt.FIG. 1 shows a
Durch den Deckel 44 ragen eine Meßlanze 28 und eine Kombinationslanze 31.A measuring
Die Kombinationslanze 31 weist eine Zuleitung 32 für Sauerstoff und eine Zuleitung 33
für metallische Stoffe auf. An der Zuleitung 32 ist eine Absperrung 34 und an der
Zuleitung 33 eine Absperrung 35 vorgesehen. Die Absperrungen 34 und 35 weisen
Steuerorgane 23, 25 auf, die über Steuerleitungen 24, 26 mit einem Meß- und
Regelgerät 22 verbunden sind. Dieses Meß- und Regelgerät 22 ist über eine
Meßleitung 27 mit einem an der Meßlanze 28 vorgesehenen Meßelement 21 zur
Messung der Temperatur T und ein Meßelement 29 zur Messung des im Gefäßraum
herrschenden Druckes P verbunden.The
Bei der Figur 2 wird ein offenes metallurgisches Gefäß 10 eingesetzt, das mit
Schmelze gefüllt ist, wobei in die Schmelze eine Rohrzuführung 46 und eine
Rohrabführung 47 eines RH-Gefäßes 45 eintauchen. Das RH-Gefäß ist über eine
Saugleitung 42 mit einer Vakuumanlage 41 verbunden. Zusätzlich zu einer
Kombinationslanze 31 ragt in das RH-Gefäß zur Zuführung von insbesondere groben
Feststoffen ein Rohr 38 hinein, das durch eine Absperrung 37 mit einem Behälter 36 in
Verbindung steht. Die Meß- und Regel- sowie die Steuereinrichtung ist wie in der
Figur 1 ausgebildet. An open
Die Figur 3 zeigt ein Gefäß 10, das durch einen Deckel 15 verschlossen ist, der eine
Glocke 14 aufweist, die mündungsseitig in die im Gefäß 10 befindliche Schmelze S
eintaucht.FIG. 3 shows a
Die mit der Vakuum 41 verbundene Sauleitung 42 ist so ausgestaltet, daß eine
absperrbare Verzweigung vorgesehen ist, und zwar einmal zur Glocke 14 mit der
Absperrung 48 und zum Deckel 15 mit der Absperrung 49.The
Die Meß- und Regeleinrichtung wie auch die Steuereinrichtung sind wie in den
Figuren 1 oder 2 ausgestaltet. Zur Druckmessung sind die Elemente 29 im
Innenraum 17 der Glocke 14 sowie im Innenraum 11 des Gefäßes, hier der Pfanne 10,
vorgesehen.The measuring and regulating device as well as the control device are as in the
Figures 1 or 2 designed. The
Das Temperatur-Meßelement 21 ist durch den metallischen Mantel 12 des Gefäßes 10
bis tief in die Feuerfestauskleidung 13 geführt. The
- 1010th
- Metallurgisches GefäßMetallurgical vessel
- 1111
- Innenraum GefäßInterior vessel
- 1212th
- Mantelcoat
- 1313
- FeuerfestauskleidungRefractory lining
- 1414
- GlockeBell jar
- 1515
- Deckelcover
- 1717th
- GlockeninnenraumBell interior
- 2121
- MeßelementMeasuring element
- 2222
- Meß- und RegelgerätMeasuring and control device
- 2323
- Steuerorgan O2 Tax body O 2
- 2424th
- Steuerleitung O2 Control line O 2
- 2525th
- Steuerorgan BrennstoffControl unit fuel
- 2626
- Steuerleitung BrennstoffControl line fuel
- 2727
- MeßleitungMeasurement line
- 2828
- Meßlanze TemperaturMeasuring probe temperature
- 2929
- Meßelement DruckMeasuring element pressure
- 3131
- KombinationslanzeCombination lance
- 3232
- Zuleitung SauerstoffSupply line oxygen
- 3333
- Zuleitung metallische BrennstoffeSupply of metallic fuels
- 3434
- Absperrung O2 Barrier O 2
- 3535
- 1. Absperrung Brennstoff1. Shut off fuel
- 3636
- BrennstoffbehälterFuel tank
- 3737
- 2. Absperrung Feststoff2. Solid shut off
- 3838
- Rohr FeststoffPipe solid
- 4141
- VakuumanlageVacuum system
- 4242
- SaugleitungSuction line
- 4343
- VakuumgefäßVacuum vessel
- 4444
- Deckelcover
- 4545
- RH-GefäßRH vessel
- 4646
- Rohr ZuführungPipe feeder
- 4747
- Rohr AbführungPipe drainage
- 4848
- Absperrung GlockeLocking bell
- 4949
- Absperrung PfanneLocking pan
- AA
- Brennstofffuel
- O2 O 2
- Sauerstoffoxygen
- TT
- Temperaturtemperature
- PP
- Druckprint
Claims (3)
- A process for decarburisation of steel melts in a closed metallurgical vessel, which is connected to a vacuum system and into which oxygen may be introduced via a lance together with combustible substances via a feed means, wherein the following steps are performed:a) after introduction of the melt and continuous reduction of the pressure to below 100 mbar, a predeterminable quantity of excess oxygen is injected in addition to the supplementary oxygen used during the decarburisation phase to perform C burn-off, which quantity corresponds to the oxygen which is required during decarburisation for burning metallic fuels or fuel mixtures without having a disadvantageous effect on the decarburisation process,b) the excess oxygen is injected during the first 10 mins injection time once the pressure has fallen below 100 mbar,c) at the time of partial oxygen excess, metallic fuel is added in evenly distributed manner via a combination lance.
- A process according to claim 1,
characterised in that
the metallic fuel is aluminium powder or aluminium granules or a fuel mixture. - A process according to claim 2,
characterised in that
the metallic fuel is added discontinuously in portions.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19544166 | 1995-11-17 | ||
DE19544166 | 1995-11-17 | ||
DE19548641 | 1995-12-13 | ||
DE19548641 | 1995-12-13 | ||
PCT/DE1996/002165 WO1997019197A1 (en) | 1995-11-17 | 1996-11-06 | Method and device for decarburizing steels melts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0861337A1 EP0861337A1 (en) | 1998-09-02 |
EP0861337B1 true EP0861337B1 (en) | 2001-08-01 |
Family
ID=26020703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96938974A Expired - Lifetime EP0861337B1 (en) | 1995-11-17 | 1996-11-06 | Method for decarburizing steels melts |
Country Status (13)
Country | Link |
---|---|
US (1) | US6235084B1 (en) |
EP (1) | EP0861337B1 (en) |
JP (1) | JP2000500528A (en) |
KR (1) | KR100287568B1 (en) |
CN (1) | CN1067438C (en) |
AT (1) | ATE203778T1 (en) |
AU (1) | AU7620696A (en) |
CZ (1) | CZ294517B6 (en) |
DE (2) | DE59607427D1 (en) |
PL (1) | PL192625B1 (en) |
RU (1) | RU2159819C2 (en) |
TW (1) | TW403788B (en) |
WO (1) | WO1997019197A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10347200B4 (en) * | 2002-12-13 | 2005-07-21 | Sms Mevac Gmbh | Degassing of liquid steel |
EP1428894A1 (en) * | 2002-12-13 | 2004-06-16 | SMS Mevac GmbH | A method of degassing molten steel |
GB0427832D0 (en) * | 2004-12-20 | 2005-01-19 | Boc Group Plc | Degassing molten metal |
US20110127701A1 (en) * | 2009-11-30 | 2011-06-02 | Grant Michael G K | Dynamic control of lance utilizing co-flow fluidic techniques |
US8323558B2 (en) * | 2009-11-30 | 2012-12-04 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Dynamic control of lance utilizing counterflow fluidic techniques |
US8377372B2 (en) * | 2009-11-30 | 2013-02-19 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Dynamic lances utilizing fluidic techniques |
CN101871035A (en) * | 2010-05-31 | 2010-10-27 | 北京科技大学 | Refining device and vacuum refining process for use in non-oriented silicon steel production |
TWI515301B (en) * | 2012-03-08 | 2016-01-01 | 杰富意鋼鐵股份有限公司 | Method for manufacturing ultra low carbon steel by using vacuum-degassing system |
CN103397137B (en) * | 2013-08-02 | 2015-04-22 | 首钢总公司 | Preparation method of wheel steel |
KR101450651B1 (en) * | 2013-11-27 | 2014-10-15 | 우진 일렉트로나이트(주) | Continuous Temperature Sensor and RH apparatus including it |
JP6331851B2 (en) * | 2014-08-05 | 2018-05-30 | 新日鐵住金株式会社 | Heating method of molten steel in ladle |
KR102034264B1 (en) * | 2018-08-03 | 2019-10-17 | 주식회사 포스코 | Apparatus for processing hot metal and method for processing hot metal |
JP7002656B2 (en) * | 2018-11-16 | 2022-01-20 | チンタオ・ユンル・アドバンスト・マテリアルズ・テクノロジー・カンパニー・リミテッド | Powder atomization device and powder atomization method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1758107B2 (en) * | 1968-04-04 | 1976-03-04 | Edelstahlwerk Witten Ag, 5810 Witten | PROCESS FOR MANUFACTURING STAINLESS CHROME AND CHROME-NICKEL STEELS |
US3702243A (en) * | 1969-04-15 | 1972-11-07 | Nat Steel Corp | Method of preparing deoxidized steel |
DE2114600B2 (en) * | 1971-03-25 | 1981-05-07 | Vacmetal Gesellschaft für Vakuum-Metallurgie mbH, 4600 Dortmund | Process for targeted vacuum decarburization of high-alloy steels |
JPS5381418A (en) * | 1976-12-28 | 1978-07-18 | Nippon Steel Corp | Manufacture of low phosphorus steel by vacuum degassing method |
SU789591A1 (en) * | 1978-06-19 | 1980-12-23 | Череповецкий Ордена Ленина Металлургический Завод Им. 50- Летия Ссср | Method of producing low-carbon steel |
US4612043A (en) * | 1984-03-29 | 1986-09-16 | Pennsylvania Engineering Corporation | Steel making method |
DE4442362C1 (en) * | 1994-11-18 | 1996-04-18 | Mannesmann Ag | Method and appts. for performing a variety of processes on a melt using standard equipment |
WO1997005291A1 (en) * | 1995-08-01 | 1997-02-13 | Nippon Steel Corporation | Process for vacuum refining of molten steel |
-
1996
- 1996-11-06 WO PCT/DE1996/002165 patent/WO1997019197A1/en active IP Right Grant
- 1996-11-06 CN CN96198781A patent/CN1067438C/en not_active Expired - Fee Related
- 1996-11-06 RU RU98111743/02A patent/RU2159819C2/en not_active IP Right Cessation
- 1996-11-06 AT AT96938974T patent/ATE203778T1/en not_active IP Right Cessation
- 1996-11-06 AU AU76206/96A patent/AU7620696A/en not_active Abandoned
- 1996-11-06 EP EP96938974A patent/EP0861337B1/en not_active Expired - Lifetime
- 1996-11-06 PL PL326635A patent/PL192625B1/en not_active IP Right Cessation
- 1996-11-06 US US09/077,040 patent/US6235084B1/en not_active Expired - Lifetime
- 1996-11-06 JP JP9519280A patent/JP2000500528A/en active Pending
- 1996-11-06 KR KR1019980703565A patent/KR100287568B1/en not_active IP Right Cessation
- 1996-11-06 DE DE59607427T patent/DE59607427D1/en not_active Expired - Fee Related
- 1996-11-06 CZ CZ19981525A patent/CZ294517B6/en not_active IP Right Cessation
- 1996-11-06 DE DE19680993T patent/DE19680993D2/en not_active Ceased
-
1997
- 1997-04-28 TW TW085114022A patent/TW403788B/en active
Also Published As
Publication number | Publication date |
---|---|
EP0861337A1 (en) | 1998-09-02 |
CN1067438C (en) | 2001-06-20 |
US6235084B1 (en) | 2001-05-22 |
KR100287568B1 (en) | 2001-04-16 |
RU2159819C2 (en) | 2000-11-27 |
WO1997019197A1 (en) | 1997-05-29 |
CN1203634A (en) | 1998-12-30 |
AU7620696A (en) | 1997-06-11 |
ATE203778T1 (en) | 2001-08-15 |
PL326635A1 (en) | 1998-10-12 |
DE19680993D2 (en) | 1999-01-28 |
KR19990067543A (en) | 1999-08-25 |
CZ294517B6 (en) | 2005-01-12 |
PL192625B1 (en) | 2006-11-30 |
JP2000500528A (en) | 2000-01-18 |
DE59607427D1 (en) | 2001-09-06 |
CZ152598A3 (en) | 1999-05-12 |
TW403788B (en) | 2000-09-01 |
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