EP1183397B1 - Method and device for tapping molten metal from metallurgical vessels - Google Patents
Method and device for tapping molten metal from metallurgical vessels Download PDFInfo
- Publication number
- EP1183397B1 EP1183397B1 EP00926821A EP00926821A EP1183397B1 EP 1183397 B1 EP1183397 B1 EP 1183397B1 EP 00926821 A EP00926821 A EP 00926821A EP 00926821 A EP00926821 A EP 00926821A EP 1183397 B1 EP1183397 B1 EP 1183397B1
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- European Patent Office
- Prior art keywords
- melt
- vessel
- gas
- metallurgical
- blowing
- 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
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 41
- 239000002184 metal Substances 0.000 title claims abstract description 41
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 18
- 239000002893 slag Substances 0.000 claims abstract description 40
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000161 steel melt Substances 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 23
- 238000002844 melting Methods 0.000 description 16
- 230000008018 melting Effects 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000005303 weighing Methods 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
- 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
- C21C5/4693—Skull removal; Cleaning of the converter mouth
Definitions
- the invention relates to a method and a device for parting off Metal melts, preferably steel melts, from metallurgical Melting vessels, such as electric arc furnaces, by an in Vessel bottom arranged tapping opening, the at the time of tapping Metal melt is overlaid with slag melt.
- molten pool level falls, it forms from the tap opening Vortex, which runs obliquely to the vessel wall. If it continues to fall Melt pool level ultimately creates a hollow vortex, which is also part of the Metal melt floating slag melt captured and swirled so that the originally existing separation between molten metal and Slag melt is no longer present and slag melt together with the molten metal is discharged down through the tap hole.
- the oxidic slag conveyed into the melting pan with the molten metal thus brings oxygen with it and leads, for example, to the increased consumption of aluminum for the necessary deoxidation, of synthetic slag for the absorption of the oxides and calcium for the modification of the oxidic inclusions.
- the oxidation product alumina (Al 2 O 3 ) deteriorates the casting properties and the oxygen from the FeO in the slag continues to make desulphurization and degassing more difficult.
- US-A-5 203 909 proposes using a blowing lance in the area to blow a gas jet from the tap opening onto the slag melt from above, through which the slag melt is pushed away from the metal surface becomes.
- the disadvantage of this known method is the indentation of the Melt slag in the molten metal, which makes it especially during training of a vortex in the molten metal, the danger of slag running given is.
- EP-A-0 321 861 is a tiltable metallurgical vessel known, at least above the tap opening on the inside of the side wall a blowing device, preferably a burner, is provided by which the slag melt blown away from the surface of the metal melt can be.
- a blowing device preferably a burner
- it is provided with a side in the vessel wall
- Known rinsing device arranged directly above the tap opening Introduce gas bubbles into the molten metal below the bath surface, to thereby also, among other things, the slag melt from to displace the surface of the molten metal.
- the task is in the case of metallurgical vessels in the bottom of the vessel arranged tap opening with the characterizing features of claim 1 solved.
- the measure according to the invention in the immediate vicinity of the tap opening to arrange at least one nozzle through which a neutral gas or corresponding gas mixture in a jet with high pulse energy into the metallurgical melting vessel is blown in, in the area of the tap opening the slag melt is removed from the molten metal surface (blown away).
- the strength and the rate of injection of the gas jet is regulated by a valve station, those with a compressed gas tank or a compressed gas generation plant in Connection is established.
- one or more nozzles are in the area of the The tap opening is arranged so that it is certain that the Slag layer is reached from the metal surface.
- the size, shape, number and arrangement (in the side wall of the vessel and / or in the Vessel lid, angle to the vessel bottom) of the nozzles are the size and design of the metallurgical vessel and the size of the bath surface adapted the nozzle outlet openings are above and / or below the bath level can.
- a metallurgical vessel 5 is shown at the time of tapping. It this embodiment is a conventional one Electric arc furnace, the electrodes not being shown.
- the left oriel there is a tap opening 10 in the vessel bottom 13 through which the molten metal 2 in a sump 11 arranged below the metallurgical vessel 5 Pouring stream 6 flows.
- the melting pan 11 is located on a ladle car 8 or the weighing cells 7 arranged there, through which the continuously into the Melting pan 11 flowing metal amount can be detected. Above the Metal melt 2 floats the slag melt 1, in which the by The tapping process generated vortex 4 extends almost to the bathroom mirror 15.
- the nozzle outlet openings 14 here from above and from are directed against the slag layer 1 below. 1 are not shown the gas supply lines 25 (Fig. 3) through which the nozzles 3 with the gas to be injected and also the valve station 16 (FIG. 3) as well as the measurement and control system 20 (FIG. 3).
- Figure 2 shows an enlarged section of the tapping part of the melting vessel 5, which is in a tilted position.
- a nozzle 3 in the lateral vessel wall 12 almost parallel to the vessel bottom 13 and arranged slightly inclined upwards.
- the gas jet 9 the slag melt 1 above the metal melt 2 pushed far from the tap opening 10 that the slag melt with the vertebra 4 no longer come into contact and a slag idler or Cinder run through the tap opening 10 can not take place.
- FIG 3 is shown in a block diagram, in which way Melting vessel 5 with the valve station 16 and the measuring and control system 20 is functionally connected.
- the on the load cells 7 due to the in Melting pan 11 flowing pouring beam 6 received measuring pulses and the am Melting vessel 5 detected measuring pulses (tilt position, melt pool height) fed into the measuring and control system 20 via the measuring lines 19, 22.
- Out this measuring and control system 20 are then via the control line 21 for the Control of the compressed gas required control pulses to the valve station 16 given.
- the invention is not based on those shown in the drawing figures metallurgical vessels (electric arc furnace / EAF) limited, but also at other metallurgical vessels applicable, in which the tap opening is in the The bottom of the vessel and where there is a risk of slag trailing through the tap opening during tapping.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Details (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Abstechen von Metallschmelzen, vorzugsweise Stahlschmelzen, aus metallurgischen Schmelzgefäßen, wie beispielsweise Elektrolichtbogenöfen, durch eine im Gefäßboden angeordnete Abstichöffnung, wobei zum Zeitpunkt des Abstichs die Metallschmelze mit Schlackenschmelze überschichtet ist.The invention relates to a method and a device for parting off Metal melts, preferably steel melts, from metallurgical Melting vessels, such as electric arc furnaces, by an in Vessel bottom arranged tapping opening, the at the time of tapping Metal melt is overlaid with slag melt.
Bei der Durchführung von thermischen metallurgischen Prozessen an Metallen oder deren Legierungen in einem metallurgischen Schmelzgefäß liegen nach Abschluss dieser Prozesse die Metalle in schmelzflüssiger Form vor, überschichtet mit schmelzflüssiger Schlacke. Um die Metallschmelze von der Schlackenschmelze abzutrennen, ist bei bekannten metallurgischen Schmelzgefäßen möglichst in einem Erkerteil im Gefäßboden eine Abstichöffnung angeordnet, durch die die Metallschmelze nach unten in eine Schmelzpfanne abgezogen werden kann.When performing thermal metallurgical processes on metals or their alloys lie in a metallurgical melting vessel after completion These processes precoat the metals in a molten form molten slag. To melt the metal from the slag melt In known metallurgical melting vessels, separation is possible in one Bay part in the bottom of the vessel arranged a tap hole through which the Metal melt can be drawn down into a melting pan.
Mit fallendem Schmelzbadspiegel bildet sich von der Abstichöffnung ausgehend ein Wirbel (Vortex) aus, der schräg bis zur Gefäßwand verläuft. Bei weiter sinkendem Schmelzbadspiegel entsteht letztlich ein Hohlwirbel, der auch Teile der auf der Metallschmelze schwimmenden Schlackenschmelze erfasst und verwirbelt, so dass die ursprünglich vorhandene Trennung zwischen Metallschmelze und Schlackenschmelze nicht mehr gegeben ist und Schlackenschmelze gemeinsam mit der Metallschmelze durch die Abstichöffnung nach unten ausgetragen wird.As the molten pool level falls, it forms from the tap opening Vortex, which runs obliquely to the vessel wall. If it continues to fall Melt pool level ultimately creates a hollow vortex, which is also part of the Metal melt floating slag melt captured and swirled so that the originally existing separation between molten metal and Slag melt is no longer present and slag melt together with the molten metal is discharged down through the tap hole.
Die mit der Metallschmelze auf diese Weise in die Schmelzpfanne geförderte oxidische Schlacke bringt Sauerstoff mit und führt beispielsweise zum Mehrverbrauch von Aluminium für die erforderliche Desoxidation, von synthetischer Schlacke für die Aufnahme der Oxide und Kalzium für die Modifikation der oxidischen Einschlüsse. Das Oxidationsprodukt Tonerde (Al2O3) verschlechtert die Gießeigenschaften und der Sauerstoff aus dem FeO in der Schlacke erschwert weiterhin die Entschwefelung und Entgasung.The oxidic slag conveyed into the melting pan with the molten metal thus brings oxygen with it and leads, for example, to the increased consumption of aluminum for the necessary deoxidation, of synthetic slag for the absorption of the oxides and calcium for the modification of the oxidic inclusions. The oxidation product alumina (Al 2 O 3 ) deteriorates the casting properties and the oxygen from the FeO in the slag continues to make desulphurization and degassing more difficult.
Demgegenüber wird bei einem reduzierten Schlackengehalt in der Metallschmelze beispielsweise die "Clean Steel"-Behandlung einer Stahlschmelze in der Sekundär-Metailurgie deutlich begünstigt, was insbesondere für die Erzeugung von "Ultra-Low-Carbon"-Stahlen für Flachprodukte eine wichtige Rolle spielt.In contrast, with a reduced slag content in the molten metal for example the "Clean Steel" treatment of a steel melt in the secondary metallurgy significantly favored, especially for the production of "ultra-low-carbon" steel for flat products plays an important role plays.
Um den geschilderten Schlackenmitlauf beim Abstich der Metalischmelze zu reduzieren, sind verschiedene Verfahren und Vorrichtungen bekannt geworden.To the described slag idling when tapping the molten metal reduce, various methods and devices have become known.
Aus der DE 33 27 671 C2 ist bekannt, einen kegelförmig geformten Strömungskörper (mit der Kegelspitze nach unten) von oben über eine Hubvorrichtung nach unten bis dicht obernalb der Abstichöffnung abzusenken. Durch diese Maßnahme umströmt der Wirbel nun den Formkörper und ist dadurch so gebunden, dass eine Verwirbelung der Schlacke nicht mehr stattfindet. Auch dieses bekannte Verfahren stellt eine relativ teure und aufwendige Methode dar, da der Formkörper im Schmelzbad einem Verschleiß unterliegt und deshalb öfters ausgetauscht werden muss.DE 33 27 671 C2 discloses a conically shaped flow body (with the cone tip down) from above using a lifting device lower down to just above the tap opening. Through this Measure, the vortex now flows around the molded body and is thus bound that the slag no longer swirls. This too known method is a relatively expensive and complex method, since the molded body is subject to wear in the weld pool and therefore needs to be replaced more often.
In der DE 298 08 318 U1 wird schließlich vorgeschlagen, im Gefäßboden um die Abstichöffnung herum gasdurchlässige kegelstumpfförmige Spülsteine anzuordnen, durch die von unten ein Gas - entgegen der Fließrichtung der Metallschmelze - in die Metallschmelze eingeblasen wird. Durch diese Maßnahme soll der Ausbildung eines Wirbels oberhalb der Abstichöffnung begegnet werden. In DE 298 08 318 U1 it is finally proposed to in the bottom of the vessel to arrange the tap opening around gas-permeable frusto-conical flushing stones, through which a gas from below - against the flow direction of the molten metal - is blown into the molten metal. By this measure the formation of a vortex above the tap opening should be countered.
In der US-A-5 203 909 wird vorgeschlagen, mittels einer Blaslanze im Bereich der Abstichöffnung von oben auf die Schlackenschmelze einen Gasstrahl aufzublasen, durch den die Schlackenschmelze von der Metalloberfläche weggedrückt wird. Nachteilig ist bei diesem bekannten Verfahren das Eindrücken der Schlackenschmelze in die Metallschmelze, wodurch insbesondere bei Ausbildung eines Wirbels in der Metallschmelze die Gefahr eines Schlackenmitlaufs gegeben ist.US-A-5 203 909 proposes using a blowing lance in the area to blow a gas jet from the tap opening onto the slag melt from above, through which the slag melt is pushed away from the metal surface becomes. The disadvantage of this known method is the indentation of the Melt slag in the molten metal, which makes it especially during training of a vortex in the molten metal, the danger of slag running given is.
Schließlich ist aus der EP-A-0 321 861 ein kippbares metallurgisches Gefäß bekannt, bei dem oberhalb der Abstichöffnung innen an der Seitenwand mindestens eine Blaseinrichtung, vorzugsweise ein Brenner, vorgesehen ist, durch den die Schlackenschmelze von der Oberfläche der Metallschmelze weggeblasen werden kann. Zusätzlich ist vorgesehen, mit einem seitlich in der Gefäßwand unmittelbar über der Abstichöffnung angeordneten bekannten Spülsteileinrichtung Gasblasen unterhalb der Badoberfläche in die Metallschmelze einzuführen, um hierdurch unter anderem gleichfalls die Schlackenschmelze von der Oberfläche der Metallschmelze zu verdrängen. Nachteilig ist bei diesem bekannten Verfahren, dass durch die aufsteigenden Gasblasen unerwünschte, den Schlackenmitlauf begünstigende, Turbulenzen in die Metallschmelze eingetragen werden.Finally, EP-A-0 321 861 is a tiltable metallurgical vessel known, at least above the tap opening on the inside of the side wall a blowing device, preferably a burner, is provided by which the slag melt blown away from the surface of the metal melt can be. In addition, it is provided with a side in the vessel wall Known rinsing device arranged directly above the tap opening Introduce gas bubbles into the molten metal below the bath surface, to thereby also, among other things, the slag melt from to displace the surface of the molten metal. The disadvantage of this known methods that undesirable, turbulence favoring the slag idling is introduced into the molten metal become.
Neben dem beschriebenen Mitlauf der Schlackenschmelze infolge ihrer Verwirbelung mit der Metallschmelze kann es auch zu einem direkten Kontakt der Schlackenschmelze mit der Abstichöffnung kommen. Dieser Schlackennachlauf kommt dann zustande, wenn beim Zurückkippen bei kippbaren metallurgischen Gefäßen, beispielsweise beim Elektrolichtbogenofen, trotz hoher Kippgeschwindigkeit die Schlackenschmelze über die Metallschmelze hinaus schnell zurückfließt.In addition to the described running of the slag melt due to its swirling there may also be direct contact with the molten metal Slag melt come with the tap hole. This slag wake comes about when tilting back with tiltable metallurgical Vessels, for example in the electric arc furnace, despite high Tilting speed the slag melt quickly beyond the metal melt flowing back.
Es ist deshalb Aufgabe der Erfindung, ein Abstichsystem anzugeben, das den Schlackenmitlauf und auch den Schlackennachlauf mit einfachen Mitteln, ohne größeren apparativen Aufwand und ohne große Betriebskosten betriebssicher reduziert.It is therefore an object of the invention to provide a tapping system that the Slag tracking and slag tracking with simple means, without greater equipment expenditure and reliable in operation without large operating costs reduced.
Die gestellte Aufgabe wird bei metallurgischen Gefäßen mit im Gefäßboden
angeordneter Abstichöffnung mit den kennzeichnenden Merkmalen des Anspruchs 1
gelöst.The task is in the case of metallurgical vessels in the bottom of the vessel
arranged tap opening with the characterizing features of
Durch die erfindungsgemäße Maßnahme, in unmittelbarer Nähe der Abstichöffnung mindestens eine Düse anzuordnen, durch die ein neutrales Gas oder eine entsprechende Gasmischung in einem Strahl mit hoher Impulsenergie in das metallurgische Schmelzgefäß eingeblasen wird, wird im Bereich der Abstichöffnung die Schlackenschmelze von der Metallschmelzoberfläche entfemt (weggeblasen). Damit ist gewährleistet, dass trotz Ausbildung eines Wirbels in der Metallschmelze ein Schlackenmitlauf nicht mehr erfolgen kann und auch der Schlackennachlauf durch dieses Verfahren durch den entsprechend energiestarken Gasstrahl mit Erfolg verhindert wird.By the measure according to the invention, in the immediate vicinity of the tap opening to arrange at least one nozzle through which a neutral gas or corresponding gas mixture in a jet with high pulse energy into the metallurgical melting vessel is blown in, in the area of the tap opening the slag melt is removed from the molten metal surface (blown away). This ensures that despite the formation of a vortex in the molten metal slag tracking can no longer take place and slag tracking through this process with the correspondingly powerful gas jet with success is prevented.
Geregelt wird die Stärke und die Einblasrate des Gasstrahls durch eine Ventilstation, die mit einem Druckgasbehälter oder einer Druckgaserzeugungsanlage in Verbindung steht.The strength and the rate of injection of the gas jet is regulated by a valve station, those with a compressed gas tank or a compressed gas generation plant in Connection is established.
Damit durch das Gaseinblasen mit dem Gas keine unerwünschten Bestandteile, wie beispielsweise Sauerstoff in die Metallschmelze gelangen, wird ein solches Gas oder Gasgemisch verwendet, das sich in Bezug auf die weitere Verwendung und Bearbeitung der Metallschmelze neutral verhält, wie beispielsweise ein Edelgas.So that by blowing the gas with the gas no undesirable components, such as For example, if oxygen gets into the molten metal, such a gas or Gas mixture used, which is in terms of further use and Processing the molten metal behaves neutrally, such as an inert gas.
Nach einer vorteilhaften Ausgestaltung der Erfindung ist die Ventilstation mit einem Mess- und Regelsystem verbunden, durch das der Startzeitpunkt, die Dauer und die Intensität des Gaseinblasens automatisch überwacht und geregelt wird. Als Messgrößen für diese automatische Regelung können durch entsprechende Messgeräte
- die Höhe des Schmelzbadspiegels im metallurgischen Schmelzgefäß,
- der Kippwinkel und die Kippgeschwindigkeit des metallurgischen Schmelzgefäßes,
- das Abstichgewicht der Metallschmelze in der Schmelzpfanne
- the level of the molten bath level in the metallurgical melting vessel,
- the tilt angle and the tilt speed of the metallurgical melting vessel,
- the tapping weight of the molten metal in the melting pan
Je nach dem Ort der Abstichöffnung sind eine oder mehrere Düsen im Bereich der Abstichöffnung so angeordnet, dass mit Sicherheit ein vollständiges Abblasen der Schlackenschicht von der Metalloberfläche erreicht wird.Depending on the location of the tap opening, one or more nozzles are in the area of the The tap opening is arranged so that it is certain that the Slag layer is reached from the metal surface.
Die Größe, Form, Anzahl und Anordnung (in der seitlichen Gefäßwand und/oder im Gefäßdeckel, Winkel zum Gefäßboden) der Düsen sind der Größe und Bauart des metallurgischen Gefäßes sowie der Größe der Badoberfläche angepasst, wobei sich die Düsenaustrittsöffnungen oberhalb und/oder unterhalb des Badspiegels befinden können.The size, shape, number and arrangement (in the side wall of the vessel and / or in the Vessel lid, angle to the vessel bottom) of the nozzles are the size and design of the metallurgical vessel and the size of the bath surface adapted the nozzle outlet openings are above and / or below the bath level can.
Weitere Vorteile, Einzelheiten und Merkmale der Erfindung werden nachfolgend anhand von in schematischen Zeichnungsfiguren dargestellten Ausführungsbeispielen näher erläutert.Further advantages, details and features of the invention are as follows with reference to those shown in schematic drawing figures Embodiments explained in more detail.
Es zeigen:
- Fig. 1
- einen Vertikalschnitt durch ein metallurgisches Gefäß,
- Fig. 2
- ein Teilausschnitt eines metallurgischen Gefäßes im Vertikalschnitt,
- Fig. 3
- ein Blockschaltbild zur erfindungsgemäßen Vorrichtung.
- Fig. 1
- a vertical section through a metallurgical vessel,
- Fig. 2
- a partial section of a metallurgical vessel in vertical section,
- Fig. 3
- a block diagram of the device according to the invention.
In Figur 1 ist ein metallurgisches Gefäß 5 zum Zeitpunkt des Abstichs dargestellt. Es
handelt sich bei diesem Ausführungsbeispiel um einen konventionellen
Elektrolichtbogenofen, wobei die Elektroden nicht eingezeichnet sind. Im linken Erker
befindet sich im Gefäßboden 13 eine Abstichöffnung 10, durch die Metallschmelze 2
in eine unterhalb des metallurgischen Gefäßes 5 angeordnete Schmetzpfanne 11 mit
Gießstrahl 6 einfließt. Die Schmelzpfanne 11 befindet sich auf einem Pfannenwagen
8 bzw. den dort angeordneten Wiegezellen 7, durch die kontinuierlich die in die
Schmelzpfanne 11 einfließende Metallmenge erfasst werden kann. Oberhalb der
Metallschmelze 2 schwimmt die Schlackenschmelze 1, in die der durch den
Abstichvorgang erzeugte Wirbel 4 bis fast zum Badspiegel 15 hineinreicht.In Figure 1, a
In unmittelbarer Nähe der Abstichöffnung 10 sind in der seitlichen Gefäßwand 12
zwei Düsen 3 angeordnet, deren Düsenaustrittsöffnungen 14 hier von oben und von
unten gegen die Schlackenschicht 1 gerichtet sind. Nicht eingezeichnet sind in Fig. 1
die Gaszuführungsleitungen 25 (Fig. 3), durch die die Düsen 3 mit dem
einzublasenden Gas beaufschlagt werden und auch die Ventilstation 16 (Fig. 3)
sowie das Mess- und Regelsystem 20 (Fig. 3).In the immediate vicinity of the tap opening 10 there are 12 in the lateral vessel wall
two
Figur 2 zeigt in einem vergrößerten Ausschnitt den Abstichteil des Schmelzgefäßes
5, das sich in einer gekippten Stellung befindet. In diesem Ausführungsbeispiel ist
eine Düse 3 in der seitlichen Gefäßwand 12 fast parallel zum Gefäßboden 13 und
leicht nach oben geneigt angeordnet. Wie in Fig. 2 schematisch dargestellt, wird
durch den Gasstrahl 9 die Schlackenschmelze 1 oberhalb der Metallschmelze 2 so
weit von der Abstichöffnung 10 zurückgedrängt, dass die Schlackenschmelze mit
dem Wirbel 4 nicht mehr in Kontakt geraten und ein Schlackenmitlauf bzw.
Schlackennachlauf durch die Abstichöffnung 10 nicht erfolgen kann.Figure 2 shows an enlarged section of the tapping part of the
In Figur 3 ist in einem Blockschaltbild dargestellt, in welcher Weise das
Schmelzgefäß 5 mit der Ventilstation 16 und dem Mess- und Regelsystem 20
funktional verbunden ist. Die an den Wiegezellen 7 auf Grund des in die
Schmelzpfanne 11 einfließenden Gießstrahls 6 erhaltenen Messimpulse und die am
Schmelzgefäß 5 erfassten Messimpulse (Kippstellung, Schmelzbadhöhe) werden
über die Messleitungen 19, 22 in das Mess- und Regelsystem 20 eingespeist. Aus
diesem Mess- und Regelsystem 20 werden dann über die Steuerleitung 21 die für die
Steuerung des Druckgases erforderlichen Steuerimpulse an die Ventilstation 16
gegeben. Das aus einem Druckgasbehälter 18 und/oder aus einer
Druckgaserzeugungsanlage 17 über die Versorgungsleitungen 23, 24 an der
Ventilstation 16 anstehende Druckgas wird dann - von der Ventilstation 16 gesteuert
mittels Mess- und Regelsystem 20 - über die Gaszuführung 25 in das metallurgische
Schmelzgefäß 5 eingeblasen.In Figure 3 is shown in a block diagram, in which
Die Erfindung ist nicht auf die in den Zeichnungsfiguren dargestellten metallurgischen Gefäße (Elektrolichtbogenofen /EAF) beschränkt, sondern auch bei anderen metallurgischen Gefäßen anwendbar, bei denen die Abstichöffnung sich im Gefäßboden befindet und bei denen die Gefahr eines Schlackenmitlaufs bzw. - nachlaufs durch die Abstichöffnung während des Abstichs besteht.The invention is not based on those shown in the drawing figures metallurgical vessels (electric arc furnace / EAF) limited, but also at other metallurgical vessels applicable, in which the tap opening is in the The bottom of the vessel and where there is a risk of slag trailing through the tap opening during tapping.
Claims (9)
- Method of tapping metal melts, preferably steel melts, from metallurgical melt vessels such as, for example, electric arc furnaces, through a tap hole arranged in the vessel base, wherein at the instant of tapping the metal melt is covered with molten slag and during tapping the molten slag is, in the region of the tap hole, removed (blown away) from the surface of the metal melt by at least one gas jet which is blown into the metallurgical melt vessel through at least one nozzle, characterised in that in the region of the tap hole (10) at least one gas jet (9) is directed obliquely from below and at least one gas jet (9) is directed obliquely from above against the molten slag (1).
- Method according to claim 1, characterised in that the strength and blowing-in rate of the gas jet (9) is regulated by a valve station (16).
- Method according to claim 1 or 2, characterised in that the starting instant, duration and intensity of the blowing-in of gas is automatically monitored and regulated by a measuring and regulating system (20).
- Method according to claim 3, characterised in that for automatic regulation of the blowing-in of gas by the measuring and regulating system (20) at least one of the parameters, namely the height of the melt bath level (15) in the metallurgical melt vessel (5), tip angle and tipping speed of the melt vessel (5) and/or tap weight of the metal melt (2) in the melt ladle (11), is used.
- Method according to one or more of claims 1 to 4, characterised in that for the blowing-in there is used a neutral gas or a gas mixture, for example a rare gas, is used which does not negatively influence the further processing and use of the metal melt (2).
- Metallurgical melt vessel (5) with a tap hole (10) arranged in the vessel base (13) and with at least one nozzle (3), which is led in the region of the tap hole (10) through the lateral vessel wall (12), for blowing in the gas jet (9), for performance of the method according to one or more of the preceding claims, characterised in that the nozzle outlet openings (14) of the nozzles (3) are arranged above and below the bath level (15).
- Metallurgical melt vessel (5) according to claim 6, characterised in that the size, shape, number and arrangement of the nozzles (3) are designed in correspondence with the size of the bath surface.
- Metallurgical melt vessel (5) according to claim 6 or 7, characterised in that the nozzles (3) are connected by way of a valve station (16) with a compressed gas generating device (17) and/or a compressed gas container (18).
- Metallurgical melt vessel (5) according to claim 8, characterised in that the valve station (16) is connected with a measuring and regulating system (20).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19916232 | 1999-04-10 | ||
| DE19916232A DE19916232A1 (en) | 1999-04-10 | 1999-04-10 | Method and device for tapping metal melts from metallurgical melting vessels |
| PCT/EP2000/003064 WO2000061823A1 (en) | 1999-04-10 | 2000-04-06 | Method and device for tapping molten metal from metallurgical vessels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1183397A1 EP1183397A1 (en) | 2002-03-06 |
| EP1183397B1 true EP1183397B1 (en) | 2003-01-08 |
Family
ID=7904145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00926821A Expired - Lifetime EP1183397B1 (en) | 1999-04-10 | 2000-04-06 | Method and device for tapping molten metal from metallurgical vessels |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1183397B1 (en) |
| JP (1) | JP2002541329A (en) |
| AT (1) | ATE230802T1 (en) |
| BR (1) | BR0009418A (en) |
| CA (1) | CA2366193A1 (en) |
| DE (2) | DE19916232A1 (en) |
| ES (1) | ES2190964T3 (en) |
| MX (1) | MXPA01010238A (en) |
| SK (1) | SK14382001A3 (en) |
| TR (1) | TR200102932T2 (en) |
| TW (1) | TW538127B (en) |
| WO (1) | WO2000061823A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10014712A1 (en) * | 2000-03-24 | 2001-09-27 | Sms Demag Ag | Method and device for slag-free pouring of metal melts from metallurgical melting vessels |
| DE10117181C1 (en) * | 2001-04-05 | 2002-10-31 | Georgsmarienhuette Gmbh | Method and device for preventing slag from flowing along when tapping a molten steel |
| EP2803927A1 (en) * | 2013-05-17 | 2014-11-19 | Siemens VAI Metals Technologies GmbH | Metallurgical furnace vessel and method for operating the same |
| KR101918360B1 (en) * | 2016-11-25 | 2018-11-13 | 한국수력원자력 주식회사 | Mold support device for uniform vitrified form and forming method uniform vitrified form using in the same |
| CN112091206B (en) * | 2019-05-31 | 2021-07-16 | 宝山钢铁股份有限公司 | Safe and reliable molten iron pretreatment automatic slag skimming method and system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743575A1 (en) * | 1987-12-22 | 1989-07-13 | Krupp Gmbh | METHOD FOR TAKING A METAL MELT AND METALLURGICAL TUBE FOR CARRYING OUT THE METHOD |
| US5203909A (en) * | 1991-10-15 | 1993-04-20 | Ltv Steel Company, Inc. | Method and apparatus for slag free casting |
| JPH0857599A (en) * | 1994-08-26 | 1996-03-05 | Nisshin Steel Co Ltd | Method and device for removing slag in tundish and continuous casting apparatus |
| JPH10176212A (en) * | 1996-12-18 | 1998-06-30 | Sumitomo Metal Ind Ltd | Method for preventing flow-out of slag at the time of discharging molten steel |
-
1999
- 1999-04-10 DE DE19916232A patent/DE19916232A1/en not_active Withdrawn
-
2000
- 2000-04-06 JP JP2000610871A patent/JP2002541329A/en not_active Withdrawn
- 2000-04-06 EP EP00926821A patent/EP1183397B1/en not_active Expired - Lifetime
- 2000-04-06 SK SK1438-2001A patent/SK14382001A3/en unknown
- 2000-04-06 TR TR2001/02932T patent/TR200102932T2/en unknown
- 2000-04-06 AT AT00926821T patent/ATE230802T1/en not_active IP Right Cessation
- 2000-04-06 MX MXPA01010238A patent/MXPA01010238A/en not_active Application Discontinuation
- 2000-04-06 BR BR0009418-8A patent/BR0009418A/en unknown
- 2000-04-06 WO PCT/EP2000/003064 patent/WO2000061823A1/en active IP Right Grant
- 2000-04-06 ES ES00926821T patent/ES2190964T3/en not_active Expired - Lifetime
- 2000-04-06 DE DE50001056T patent/DE50001056D1/en not_active Expired - Fee Related
- 2000-04-06 CA CA002366193A patent/CA2366193A1/en not_active Abandoned
- 2000-04-08 TW TW089106526A patent/TW538127B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002541329A (en) | 2002-12-03 |
| DE19916232A1 (en) | 2000-10-12 |
| BR0009418A (en) | 2002-01-02 |
| EP1183397A1 (en) | 2002-03-06 |
| CA2366193A1 (en) | 2000-10-19 |
| TR200102932T2 (en) | 2002-05-21 |
| TW538127B (en) | 2003-06-21 |
| DE50001056D1 (en) | 2003-02-13 |
| WO2000061823A1 (en) | 2000-10-19 |
| ATE230802T1 (en) | 2003-01-15 |
| SK14382001A3 (en) | 2002-09-10 |
| ES2190964T3 (en) | 2003-09-01 |
| WO2000061823B1 (en) | 2001-02-01 |
| MXPA01010238A (en) | 2002-05-06 |
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