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EP0514383A1 - Process and installation for renewing the refractory lining of foundry ladles. - Google Patents

Process and installation for renewing the refractory lining of foundry ladles.

Info

Publication number
EP0514383A1
EP0514383A1 EP91901674A EP91901674A EP0514383A1 EP 0514383 A1 EP0514383 A1 EP 0514383A1 EP 91901674 A EP91901674 A EP 91901674A EP 91901674 A EP91901674 A EP 91901674A EP 0514383 A1 EP0514383 A1 EP 0514383A1
Authority
EP
European Patent Office
Prior art keywords
pan
lining
slag
old
refractory
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.)
Granted
Application number
EP91901674A
Other languages
German (de)
French (fr)
Other versions
EP0514383B1 (en
Inventor
Wilhelm Eitel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Original Assignee
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Intocast GmbH Feuerfestprodukte und Giesshilfsmittel filed Critical Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Publication of EP0514383A1 publication Critical patent/EP0514383A1/en
Application granted granted Critical
Publication of EP0514383B1 publication Critical patent/EP0514383B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • B22D41/023—Apparatus used for making or repairing linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
    • F27D1/1694—Breaking away the lining or removing parts thereof

Definitions

  • the invention relates to a method of the type corresponding to the preamble of claim 1 and a system according to the preamble of claim 4.
  • metallurgical vessels are no longer being lined with refractory bricks, but rather with the aid of a casting technique in which the space between a stencil or mold that provides the desired clear interior space of the pan or the like determined metallurgical vessel, and the vessel wall to be delivered is filled with a mostly thixotropic refractory casting compound which, due to its thixotropic behavior, under the action of vibrations (usually the template or shape) very well even at low water contents is flowable and fills every cavity.
  • the template is again introduced into the metallurgical vessel with the old delivery thus cleaned, whereupon the space between the template and the old delivery is filled again with thixotropic casting compound under the action of vibrations. In this way, up to 50% of the expensive delivery material can be saved.
  • the previous treatment of the surface of the old inlay results in a good bond to the newly applied refractory mass.
  • the invention is based on the object * of being able to economically restore the refractory lining of metallurgical vessels even in such cases.
  • a ladle trip that is when the refractory lining is to be restored, the ladle is removed from the pouring heat immediately after the slag tipping placed in the still completely hot state on the shortest route with a slight inclination outwards and downwards on the stand.
  • the preservation of the amount of heat contained in the pan is essential for the economy of the process.
  • a high-temperature burner with a water-cooled lance which can be moved up and down and rotated, can be moved on rails in the depth direction of the pan, whereby the burner can be spirally and helically guided at a suitable distance over the inner surface of the pan is.
  • the burner works with gas or oil and oxygen and can be operated in such a way that it works in a reducing manner, ie it does not develop brown vapors.
  • the burner lance can be guided in a circle so that in the floor and wall area the. adhering slag, slag steel mixtures or steel residues become highly liquid and flow out of the inclined lower region of the pan from the mouth of the pan, where they reach a slag bucket or a sand bed. In this way, the pan is cleaned within a few minutes. All that remains on the old refractory lining is a thin, glass-like, smooth slag coating, which is roughened mechanically after the pan has cooled down in order to achieve a good primer for the new lining material.
  • the roughening can be done by the aforementioned slag shuttering robot, which partially or completely removes the slag layer and in any case leaves a rough surface of the old delivery.
  • the template is introduced again into the pan according to the method already known and the space between the template and the surface of the remaining lining is filled with new casting compound.
  • the infeed can be restored in the shortest possible time without great mechanical stress on the permanent feed and without extensive stripping work.
  • a burner operated with oxygen has flame temperatures in the range of 3000 ° C.
  • the one in the pan Remaining materials to be removed, such as slag, slag steel mixtures or steel residues, have melting points in the range from approximately 1000 to 1500 °.
  • the temperature of the pan is still very high from the last pour, so that the burner does not have to heat the pan from ambient temperature. Rather, the burner only has to generate the last temperature peak in order to liquefy the total amount of undesired constituents adhering to the surface, which is accomplished in a short time.
  • burners which have features of DE-PS 15 29 201 and 31 51.479, in particular with regard to the burner nozzle.
  • the roughening device is used, which is known from DE-OS 37 41 073.
  • A reveals a freshly delivered ladle 10, which consists of a pot-shaped housing 1 made of sheet steel and tapering slightly downwards, on the inside of which a so-called infeed or lining made of refractory material of essentially constant thickness of a few 10 centimeters is applied is.
  • the pan 10 can be gripped and displaced by the overhead crane on side lugs 3 in the upper region.
  • the steel is subjected to a metallurgical treatment, for example by blowing in oxygen, argon or the like, and then poured off.
  • a metallurgical treatment for example by blowing in oxygen, argon or the like, and then poured off.
  • the slag is poured off and the delivery of the pan 10 looks as indicated in B.
  • the infeed is bearded, ie thick layers of slag or beads have accumulated, as is indicated by the cross-hatching for the slag S. Steel residues or mixtures of steel slag may also be present.
  • Thinner slag layers also adhere in areas 2 1 the surface areas of the infeed 2 are penetrated by slag to a certain depth, which reduces their fire resistance, the coarse beads on the upper edge of the pan are broken out with a suitable device, and the pan is then removed immediately, ie as long as possible the infeed 2 is still glowing bright red from the last casting, placed with the hall crane lying on a nearby stand 4, so that the wall of the infeed 2 has an angle 5 of 5 in its essentially cylindrical area with the horizontal takes about 5 to 30, wherein in the schematic representation of the embodiment the Inclination is particularly strong.
  • the opening 6 of the pan 10 points downwards.
  • a carriage or carriage 7 is now brought up on rails, which carries a lance 8 with a high-temperature burner at the free end, which can be inserted into the interior of the pan 10 and can be pivoted both in the direction of arrow 11 and in the direction of Arrow 12 is rotatable as well as in the direction of arrow 13 in the longitudinal direction of the lance into pan 10.
  • the carriage or carriage 7 also carries a heat shield 14 which covers the opening 6 of the pan 10.
  • the high-temperature burner 9 is operated with a suitable gaseous or liquid fuel and pure oxygen and generates flame temperatures in the range of 3000 ° C., which is the still red-hot slag, whose melting point is in the range of 1000-1500 ° C. melts, the heat shield 14 avoids heat losses and prevents excessive radiation on the carriage 7.
  • the melted slag flows downward from the opening 6 of the pan 10 in the direction of the arrows 15 into the slag bucket 16.
  • the pan 10 has the opportunity to cool between phase C and phase D.
  • the pan is placed in a pit 17 by means of the indoor crane. There is no longer any thicker slag layer, which is why the cross hatching (see B) has been omitted.
  • the slag robot 20 comprises a machine frame 18 which projects over the pan 10 and on which a vertical column 19 can be raised and lowered in the direction of the arrow 21 and can be rotated about its longitudinal axis in the direction of the arrow 25.
  • pivotable arms 22 are attached, at the free ends of which rotatable tools 23 are provided in the form of rollers fitted with hard metal pins 24, which follow the contour of the inner surface of the infeed 2 and under the action perform a hammering attack on the slag layer by vibrators and remove or at least roughen it without substantially changing the relief of the inner surface 26 and removing a lot of the healthy material of the delivery 2.
  • phase E the slag robot is removed and instead a slightly conical template 27 is introduced into the interior of the pan 10 on a carrying device 28.
  • the template 27 determines the inner surface configuration of the infeed 2, as can be seen from A.
  • Refractory feed mass 30 introduced, which has a consistency like slightly damp sand, under the action of the vibrators working against the template 27
  • the refractory mass introduced into the intermediate space 32 is dried by means of a ladle fire 33 and combines with the old delivery to form a new compact and homogeneous delivery 2, so that the ladle 10 returns to phase A. ⁇ reaches and can start again a pan trip.
  • a high-temperature burner 9 was used, which features of DE-PS 15 29 201 and.
  • the high-temperature burner 9 was operated with approx. 280 Nm / h propane and 900 Nm 3 / h oxygen without the addition of air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Medicinal Preparation (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Fertilizers (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

PCT No. PCT/DE91/00021 Sec. 371 Date Aug. 4, 1992 Sec. 102(e) Date Aug. 4, 1992 PCT Filed Jan. 14, 1991 PCT Pub. No. WO91/12103 PCT Pub. Date Aug. 22, 1991.A process for renewing the refractory lining of a ladle for casting steel and of similar metallurgical vessels. While the ladle (10) is still hot, the slag (S) still adhering to the inner surface (26) is melted off from the remaining lining (2) with the aid of a high-temperature burner (9) operating under reducing conditions and allowed to run out of the ladle (10) in the molten condition. After cooling, the glassy surface of the remaining lining (2) is roughened. The new refractory lining (30) is then applied by casting, with the aid of a template.

Description

Verfahren und Anlage zur Wiederherstellung der feuerfesten Auskleidung von Gießpfannen Process and installation for restoring the refractory lining of ladles
Die Erfindung bezieht sich auf ein Verfahren der dem Oberbegriff des Anspruchs 1 entsprechenden Art sowie eine Anlage nach dem Oberbegriff des Anspruchs 4.The invention relates to a method of the type corresponding to the preamble of claim 1 and a system according to the preamble of claim 4.
Metallurgische Gefäße werden in jüngster Zeit in stei¬ gendem Maße nicht mehr mit feuerfesten Steinen ausgeklei¬ det (zugestellt), sondern mit Hilfe einer Gießtechnik, bei der in den Zwischenraum zwischen einer Schablone oder Form, die den gewünschten lichten Innenraum der Pfanne oder des sonstigen metallurgischen Gefäßes bestimmt, und der zuzu¬ stellenden Gefäßwand eine meist thixotrop wirkende feuer¬ feste Gießmasse eingefüllt wird, die, bedingt durch ihr thixotropes Verhalten, unter der Einwirkung von Vibrati¬ onen (meist der Schablone bzw. Form) auch bei niedrigen Wassergehalten sehr gut fließfähig ist und jeden Hohlraum ausfüllt.Recently, metallurgical vessels are no longer being lined with refractory bricks, but rather with the aid of a casting technique in which the space between a stencil or mold that provides the desired clear interior space of the pan or the like determined metallurgical vessel, and the vessel wall to be delivered is filled with a mostly thixotropic refractory casting compound which, due to its thixotropic behavior, under the action of vibrations (usually the template or shape) very well even at low water contents is flowable and fills every cavity.
Aus der DE-OS 37 41 073 ist es bereits bekannt, am Ende der Haltbarkeit eines metallurgischen Gefäßes, also nach dem Verschleiß der inneren, der Schmelze ausgesetzten Schichten der Gießmasse, den verbleibenden Rest der feuer¬ festen Auskleidung, der ja noch betriebsfähig ist, nicht ganz auszubrechen, sondern nur oberflächlich die verblie¬ benen Schlackenreste und die von Schlacke penetrier- ten Oberflächenschichten der alten Zustellung zu entfer¬ nen. Dies geschieht nicht unter Herstellung einer geome- trisch regelmäßigen Oberfläche, sondern indem ein sogenann¬ ter Schlackenschalroboter mit an beweglichen Armen angebrach¬ ten, auf der Oberfläche abrollenden Werkzeugen mit vorste¬ henden Hartmetallzapfen unter der Wirkung von Vibrationen an der Oberfläche angreift und diese in dem erforderlichen Maß abträgt bzw. zumindest aufrauht. Die Werkzeuge folgen dabei aber der im großen vorhandenen Kontur der alten Zu¬ stellung. In das metallurgische Gefäß mit der so gereinig¬ ten alten Zustellung wird erneut die Schablone eingebracht, worauf der Zwischenraum zwischen Schablone und alter Zu¬ stellung mit thixotroper Gießmasse unter der Wirkung von Vibrationen wieder ausgefüllt wird. Auf diese Weise kann bis zu 50 % des teuren Materials der Zustellung eingespart werden. Durch die vorangehende Bearbeitung der Oberfläche der alten Zustellung ergibt sich ein guter Verbund zu der neu aufgebrachten feuerfesten Masse.From DE-OS 37 41 073 it is already known, at the end of the shelf life of a metallurgical vessel, that is after the wear of the inner layers of the casting composition which are exposed to the melt, the remaining rest of the refractory lining, which is still operational, not to break out completely, but only to remove the remaining slag residues and the surface layers of the old feed penetrated by slag on the surface. This does not happen with the production of a trisch regular surface, but by a so-called slag shutter robot with tools attached to movable arms, rolling on the surface with protruding hard metal pegs under the action of vibrations on the surface and removes or roughenes them to the required extent. However, the tools follow the largely existing contour of the old feed. The template is again introduced into the metallurgical vessel with the old delivery thus cleaned, whereupon the space between the template and the old delivery is filled again with thixotropic casting compound under the action of vibrations. In this way, up to 50% of the expensive delivery material can be saved. The previous treatment of the surface of the old inlay results in a good bond to the newly applied refractory mass.
Es zeigt sich jedoch, daß das bekannte Verfahren in bestimmten Fällen zu aufwendig wird. Dies trifft dann zu, wenn die Verbärung, d.h. die Schlackenschicht, so stark ist, daß der Zeitaufwand zu ihrer Abtragung und der damit einhergehende Verschleiß der Werkzeuge zu groß werden, um das Verfahren rentabel zu halten. Auch wird durch die lang¬ dauernde Einwirkung der Werkzeuge der verbleibende Anteil der feuerfesten Auskleidung mechanisch stark beansprucht, so daß es zu Rissen kommen kann.It turns out, however, that the known method is too expensive in certain cases. This is true when the bear, i.e. the slag layer is so thick that the time it takes to remove it and the associated wear on the tools become too great to keep the process profitable. The remaining portion of the refractory lining is also mechanically stressed by the long-term action of the tools, so that cracks can occur.
Der Erfindung liegt die Aufgabe* zugrunde, auch in sol¬ chen Fällen die feuerfeste Auskleidung von metallurgischen Gefäßen auf wirtschaftliche Weise wiederherstellen zu kön¬ nen.The invention is based on the object * of being able to economically restore the refractory lining of metallurgical vessels even in such cases.
Diese Aufgabe wird durch das in Anspruch 1 wiederge¬ gebene Verfahren und in ihrem apparativen Aspekt durch die in Anspruch 4 wiedergegebene Anlage gelöst.This object is achieved by the method reproduced in claim 1 and in its apparatus aspect by the system reproduced in claim 4.
Am Ende einer Pfannenreise, wenn also die Wiederher¬ stellung der feuerfesten Auskleidung ansteht, wird die Pfan¬ ne aus der Gießhitze unmittelbar nach dem Schlackenkippen in noch völlig heißem Zustand auf kürzestem Wege mit leich¬ ter Neigung nach außen und unten auf dem Stand abgelegt. Die Bewahrung der in der Pfanne enthaltenen Wärmemenge ist für die Wirtschaftlichkeit des Verfahrens wesentlich. Vor der Pfanne ist ein Hochtemperaturbrenner mit einer wasser¬ gekühlten Lanze, die auf- und abbewegbar und rotierbar ist, auf Schienen in Tiefenrichtung der Pfanne verfahrbar, wo¬ durch der Brenner spiralig und schraubenförmig in geeigne¬ tem Abstand über die innere Oberfläche der Pfanne führbar ist. Der Brenner arbeitet mit Gas oder öl und Sauerstoff und kann so gefahren werden, daß er reduzierend arbeitet, d.h. keine braunen Dämpfe entwickelt. Beginnend im Boden¬ bereich kann die Brennerlanze kreisend so geführt werden, daß im Boden- und Wandbereich in kürzester Zeit die. anhaf¬ tende Schlacke, Schlackenstahlgemische oder Stahlreste hoch¬ flüssig werden und aus dem geneigten unteren Bereich der Pfanne aus deren Mündung heraus nach außen fließen, wo sie in einen Schlackenkübel oder in ein Sandbett gelangen. Auf diese Weise ist die Pfanne binnen weniger Minuten gereinigt. Es bleibt auf der alten feuerfesten Auskleidung lediglich ein dünner glasartiger, glatter Schlackenüberzug zurück, der nach Abkühlung der Pfanne mechanisch aufgerauht wird, um einen guten Haftgrund für das neue Auskleidungsmaterial zu erzielen. Die Aufrauhung kann durch den bereits erwähnten Schlackenschalroboter geschehen, der die Schlackenschicht teilweise oder ganz beseitigt und jedenfalls eine rauhe Oberfläche der alten Zustellung zurückläßt.At the end of a ladle trip, that is when the refractory lining is to be restored, the ladle is removed from the pouring heat immediately after the slag tipping placed in the still completely hot state on the shortest route with a slight inclination outwards and downwards on the stand. The preservation of the amount of heat contained in the pan is essential for the economy of the process. In front of the pan, a high-temperature burner with a water-cooled lance, which can be moved up and down and rotated, can be moved on rails in the depth direction of the pan, whereby the burner can be spirally and helically guided at a suitable distance over the inner surface of the pan is. The burner works with gas or oil and oxygen and can be operated in such a way that it works in a reducing manner, ie it does not develop brown vapors. Beginning in the floor area, the burner lance can be guided in a circle so that in the floor and wall area the. adhering slag, slag steel mixtures or steel residues become highly liquid and flow out of the inclined lower region of the pan from the mouth of the pan, where they reach a slag bucket or a sand bed. In this way, the pan is cleaned within a few minutes. All that remains on the old refractory lining is a thin, glass-like, smooth slag coating, which is roughened mechanically after the pan has cooled down in order to achieve a good primer for the new lining material. The roughening can be done by the aforementioned slag shuttering robot, which partially or completely removes the slag layer and in any case leaves a rough surface of the old delivery.
Es wird sodann nach der bereits beschriebenen, für sich bekannten Methode die Schablone wieder in die Pfanne einge¬ bracht und der Zwischenraum zwischen Schablone und der Ober¬ fläche der stehengebliebenen Auskleidung mit neuer Gie߬ masse ausgefüllt.Then the template is introduced again into the pan according to the method already known and the space between the template and the surface of the remaining lining is filled with new casting compound.
Durch das neue Verfahren ist die Wiederherstellung der Zustellung ohne große mechanische Beanspruchung des Dauer¬ futters und ohne umfangreiche Ausbrecharbeiten in kürzester Zeit durchzuführen.With the new method, the infeed can be restored in the shortest possible time without great mechanical stress on the permanent feed and without extensive stripping work.
Ein mit Sauerstoff betriebener Brenner weist Flamm¬ temperaturen im Bereich von 3000° C auf. Die in der Pfanne verbliebenen zu entfernenden Materialien wie Schlacke, Schlak- kestahlgemische oder Stahlreste weisen Schmelzpunkte im Be¬ reich von etwa 1000 bis 1500° auf. Die Temperatur der Pfanne ist vom letzten Abguß ohnehin noch sehr hoch, so daß der Brenner die Pfanne nicht etwa von Umgebungstemperatur auf¬ heizen muß. Der Brenner muß vielmehr nur die letzte Tempe¬ raturspitze erzeugen, um die Gesamtmenge der an der Ober¬ fläche anhaftenden unerwünschten Bestandteile zu verflüssi¬ gen, was in kurzer Zeit geleistet wird. Es kommen beispiels¬ weise Brenner in Betracht, die insbesondere im Hinblick auf die Brennerdüse Merkmale der DE-PSen 15 29 201 und 31 51.479 aufweisen.A burner operated with oxygen has flame temperatures in the range of 3000 ° C. The one in the pan Remaining materials to be removed, such as slag, slag steel mixtures or steel residues, have melting points in the range from approximately 1000 to 1500 °. The temperature of the pan is still very high from the last pour, so that the burner does not have to heat the pan from ambient temperature. Rather, the burner only has to generate the last temperature peak in order to liquefy the total amount of undesired constituents adhering to the surface, which is accomplished in a short time. There are, for example, burners which have features of DE-PS 15 29 201 and 31 51.479, in particular with regard to the burner nozzle.
Zur Vermeidung von Wärmeverlusten empfiehlt es sich, einen Hitzeschild vorzusehen, der das Innere der Pfanne wäh¬ rend des Betriebs des Brenners nach außen abschließt.To avoid heat loss, it is advisable to provide a heat shield which closes the inside of the pan to the outside during operation of the burner.
Bei dem bevorzugten Ausführungsbeispiel der Anlage wird die Aufrauhvorrichtung eingesetzt, die für sich aus der DE-OS 37 41 073 bekannt ist. Es ist aber auch möglich, an¬ dere Aufrauhvorrichtungen zu verwenden, zum Beispiel Sand¬ strahl- oder ähnliche Partikelgebläse.In the preferred embodiment of the system, the roughening device is used, which is known from DE-OS 37 41 073. However, it is also possible to use other roughening devices, for example sandblasting or similar particle blowers.
In der Zeichnung sind die verschiedenen Phasen der Be¬ handlung einer Gießpfanne für Stahl im Vertikalschnitt sche¬ matisch dargestellt und mit großen Buchstaben Bezeichnet.In the drawing, the various phases of the treatment of a ladle for steel are shown schematically in vertical section and are identified by large letters.
A läßt eine frisch zugestellte Gießpfanne 10 erkennen, die aus einem topfförmigen sich nach unten leicht verjün¬ genden Gehäuse 1 aus Stahlblech besteht, auf dessen Innen¬ seite eine sogenannte Zustellung oder Auskleidung aus feu¬ erfestem Material im wesentlichen gleichbleibender Dicke von einigen 10 Zentimetern aufgebracht ist. An seitlichen Ansätzen 3 im oberen Bereich kann die Pfanne 10 vom Hal¬ lenkran erfaßt und versetzt werden.A reveals a freshly delivered ladle 10, which consists of a pot-shaped housing 1 made of sheet steel and tapering slightly downwards, on the inside of which a so-called infeed or lining made of refractory material of essentially constant thickness of a few 10 centimeters is applied is. The pan 10 can be gripped and displaced by the overhead crane on side lugs 3 in the upper region.
In der Pfanne 10 wird der STahl einer metallurgischen Behandlung beispielsweise durch Einblasen von Sauerstoff, Argon oder dergleichen unterzogen und dann abgegossen. Nach einer Anzahl solcher Behandlungs- oder Gießvorgänge, d.h. nach einer solchen Pfannenreise, wird die Schlacke abgegossen und sieht die Zustellung der Pfanne 10 so aus wie in B ange¬ deutet. Es gibt Bereiche 21, in denen die Wandstärke der Zustellung 2 erheblich abgenommen hat. In anderen Bereichen 2" ist die Zustellung verbärt, d.h. es haben sich dicke Schlackenschichten oder -wülste angesetzt, wie es durch die die Schlacke S darstellende Kreuzschraffür angedeutet ist. Auch können Stahlreste oder Stahlschlackengemische vorhanden sein. Auch in den Bereichen 21 haften dünnere Schlackenschichten an bzw. sind die Oberflächenbereiche der Zustellung 2 von Schlacke bis zu einer gewissen Tiefe penetriert, was ihre Feuerfestigkeit herabsetzt. Die groben Wülste am oberen Rand der Pfanne werden mit einer geeigne¬ ten Vorrichtung herausgebrochen, und es wird sodann die Pfanne sogleich, d.h. solange die Zustellung 2 noch vom letzten Abguß her hellrot glühend ist, mit dem Hallenkran liegend auf einem in der Nähe befindlichen Stand 4 abgelegt, so daß die Wandung der Zustellung 2 in ihrem im wesentli¬ chen zylindrischen Bereich mit der Horizontalen einen Win¬ kel 5 von etwa 5 bis 30 einnimmt, wobei in der schemati¬ schen Darstellung des Ausführungsbeispiel die Neigung be¬ sonders stark wiedergegeben ist. Die Öffnung 6 der Pfanne 10 weist nach unten.In the pan 10, the steel is subjected to a metallurgical treatment, for example by blowing in oxygen, argon or the like, and then poured off. After a number of such treatment or pouring operations, ie after such a pan journey, the slag is poured off and the delivery of the pan 10 looks as indicated in B. There are areas 2 1 in which the wall thickness of the infeed 2 has decreased considerably. In other areas 2 ", the infeed is bearded, ie thick layers of slag or beads have accumulated, as is indicated by the cross-hatching for the slag S. Steel residues or mixtures of steel slag may also be present. Thinner slag layers also adhere in areas 2 1 the surface areas of the infeed 2 are penetrated by slag to a certain depth, which reduces their fire resistance, the coarse beads on the upper edge of the pan are broken out with a suitable device, and the pan is then removed immediately, ie as long as possible the infeed 2 is still glowing bright red from the last casting, placed with the hall crane lying on a nearby stand 4, so that the wall of the infeed 2 has an angle 5 of 5 in its essentially cylindrical area with the horizontal takes about 5 to 30, wherein in the schematic representation of the embodiment the Inclination is particularly strong. The opening 6 of the pan 10 points downwards.
Es wird nun auf Schienen ein Schlitten oder Wagen 7 herangefahren, der eine Lanze 8 mit einem Hochtemperatur¬ brenner am freien Ende trägt, der in das Innere der Pfan¬ ne 10 einführbar ist und sowohl im Sinne des Pfeiles 11 verschwenkbar als auch im Sinne des Pfeiles 12 verdreh¬ bar als auch im Sinne des Pfeiles 13 in Längsrichtung der Lanze in die Pfanne 10 hinein verlagerbar ist. Der Schlit¬ ten oder Wagen 7 trägt ferner einen Hitzeschild 14, der die Öffnung 6 der Pfanne 10 überdeckt.A carriage or carriage 7 is now brought up on rails, which carries a lance 8 with a high-temperature burner at the free end, which can be inserted into the interior of the pan 10 and can be pivoted both in the direction of arrow 11 and in the direction of Arrow 12 is rotatable as well as in the direction of arrow 13 in the longitudinal direction of the lance into pan 10. The carriage or carriage 7 also carries a heat shield 14 which covers the opening 6 of the pan 10.
Der Hochtemperaturbrenner 9 wird mit einem geeigne¬ ten gasförmigen oder flüssigen Brennstoff und reinem Sauer¬ stoff betrieben und erzeugt Flammtemperaturen im Bereich von 3000° C, die die noch rotglühende Schlacke, deren Schmelz¬ punkt im Bereich von 1000-.1500°C liegt, zum Schmelzen bringt, wobei der Hitzeschild 14 Wärmeverluste vermeidet und eine zu starke Abstrahlung auf den Wagen 7 unterbindet.The high-temperature burner 9 is operated with a suitable gaseous or liquid fuel and pure oxygen and generates flame temperatures in the range of 3000 ° C., which is the still red-hot slag, whose melting point is in the range of 1000-1500 ° C. melts, the heat shield 14 avoids heat losses and prevents excessive radiation on the carriage 7.
Die herausgeschmolzene Schlacke strömt im Sinne der Pfeile 15 aus der Öffnung 6 der Pfanne 10 nach unten in den Schlackenkübel 16 ab.The melted slag flows downward from the opening 6 of the pan 10 in the direction of the arrows 15 into the slag bucket 16.
Die Pfanne 10 hat zwischen der Phase C und der Phase D Gelegenheit abzukühlen. Die Pfanne wird mittels des Hallen- krans in eine Grube 17 gesetzt. Es ist nunmehr keine dicke¬ re Schlackenschicht mehr vorhanden, weswegen die Kreuz- schraffur (s. B) weggelassen ist. Es ist aber an der Ober¬ fläche der stehengebliebenen Auskleidung 2 von dem Ausschmel¬ zen her noch eine dünne glasartige, sehr glatte Schlacken¬ schicht vorhanden, die in der Phase D mittels des Schlacken¬ roboters 20 zumindest teilweise entfernt und jedenfalls aufgerauht wird. Der Schlackenroboter 20 umfaßt ein über die Pfanne 10 ausladendes Maschinengestell 18, an welchem eine vertikale Säule 19 im Sinne des Pfeiles 21 heb- und senkbar und im Sinne des Pfeiles 25 um ihre Längsachse dreh¬ bar gelagert ist. Am unteren Ende der Säule 19 sind schwenk¬ bare Arme 22 angebracht, an deren freien Enden drehbare Werkzeuge 23 in Gestalt von mit Hartmetallzapfen 24 besetz¬ ten Rollen vorgesehen sind, die der Kontur der inneren Ober¬ fläche der Zustellung 2 folgen und unter der Einwirkung von Vibratoren einen hämmernden Angriff an der Schlacken¬ schicht ausführen und diese entfernen oder zumindest auf¬ rauhen, ohne dabei das Relief der inneren Oberfläche 26 wesentlich zu ändern und viel vom gesunden Material der Zustellung 2 zu entfernen.The pan 10 has the opportunity to cool between phase C and phase D. The pan is placed in a pit 17 by means of the indoor crane. There is no longer any thicker slag layer, which is why the cross hatching (see B) has been omitted. However, from the melting point, there is still a thin, glassy, very smooth slag layer on the surface of the remaining lining 2, which in phase D is at least partially removed and in any case roughened by means of the slag robot 20. The slag robot 20 comprises a machine frame 18 which projects over the pan 10 and on which a vertical column 19 can be raised and lowered in the direction of the arrow 21 and can be rotated about its longitudinal axis in the direction of the arrow 25. At the lower end of the column 19, pivotable arms 22 are attached, at the free ends of which rotatable tools 23 are provided in the form of rollers fitted with hard metal pins 24, which follow the contour of the inner surface of the infeed 2 and under the action perform a hammering attack on the slag layer by vibrators and remove or at least roughen it without substantially changing the relief of the inner surface 26 and removing a lot of the healthy material of the delivery 2.
In der Phase E wird der Schlackenroboter entfernt und statt dessen eine leicht konische Schablone 27 an einer Tragvorrichtung 28 in das Innere der Pfanne 10 eingebracht. Die Schablone 27 bestimmt die innere Oberflächengestallt der Zustellung 2, wie sie aus A ersichtlich ist. In den Zwischenraum zwischen der Oberfläche 26 und der Schablo¬ ne 27 wird mittels einer Zuführeinrichtung 29 thixotrope feuerfeste Zustellmasse 30 eingebracht, die an sich eine Konsistenz wie schwachfeuchter Sand aufweist, unter der Wirkung der gegen die Schablone 27 arbeitenden VibratorenIn phase E, the slag robot is removed and instead a slightly conical template 27 is introduced into the interior of the pan 10 on a carrying device 28. The template 27 determines the inner surface configuration of the infeed 2, as can be seen from A. In the space between the surface 26 and the template 27 is thixotropic by means of a feed device 29 Refractory feed mass 30 introduced, which has a consistency like slightly damp sand, under the action of the vibrators working against the template 27
31 jedoch quasi flüssig wird und den gesamten Zwischenraum31 becomes quasi fluid and the entire space
32 zwischen der Schablone 27 und der inneren Oberfläche 26 homogen ausfüllt.32 homogeneously fills between the template 27 and the inner surface 26.
Nach dem Entfernen der Schablone 27 wird die in den Zwischenraum 32 eingebrachte feuerfeste Masse mittels eines Pfannenfeuers 33 getrocknet und verbindet sich mit der al¬ ten Zustellung zu einer neuen kompakten und homogenen Zu¬ stellung 2, so daß die Pfanne 10 in die Phase A zurückge¬ langt und erneut eine Pfannenreise antreten kann.After the template 27 has been removed, the refractory mass introduced into the intermediate space 32 is dried by means of a ladle fire 33 and combines with the old delivery to form a new compact and homogeneous delivery 2, so that the ladle 10 returns to phase A. ¬ reaches and can start again a pan trip.
Bei Versuchen in einer 95 to Stahlpfanne mit einem Innen¬ durchmesser von ca. 2600 mm und einer inneren Höhe von ca. 3440 mm wurde ein Hochtemperatur-Brenner 9 verwendet, der insbesondere im Hinblick auf die Düsengestaltung Merkmale der DE-PSen 15 29 201 und 31 51 479 aufwies und mit der Mündung der Düse etwa in der Mitte des lichten Innenraums der Pfanne angeordnet war, wie es in C dargestellt ist.In tests in a 95 ton steel pan with an inside diameter of approx. 2600 mm and an inside height of approx. 3440 mm, a high-temperature burner 9 was used, which features of DE-PS 15 29 201 and. In particular with regard to the nozzle design 31 51 479 and was arranged with the mouth of the nozzle approximately in the middle of the clear interior of the pan, as shown in C.
3 Der Hochtemperaturbrenner 9 wurde mit ca. 280 Nm /h Propan und 900 Nm 3/h Sauerstoff ohne Luftbeimischung betrieben.3 The high-temperature burner 9 was operated with approx. 280 Nm / h propane and 900 Nm 3 / h oxygen without the addition of air.
Er arbeitete etwa 15 Minuten-, bis die Schlacke in ausrei¬ chendem Maß herausgeschmolzen war. He worked for about 15 minutes until the slag had melted out to a sufficient extent.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zur Wiederherstellung der feuerfesten Auskleidung einer Pfanne zum Vergießen von Stahl und ähn¬ lichen metallurgischen Gefäßen, bei welchem nach einer Pfannenreise die anhaftende Schlacke und gegebenenfalls noch die schlackengetränkten obersten Schichten der alten Auskleidung entfernt und auf die alte Auskleidung eine neue feuerfeste Ergänzungsauskleidung im Gießverfahren aufge¬ bracht wird, die mit der alten Auskleidung zusammen eine Gesamt-Feuerfestauskleidung in der ursprünglichen Wand¬ stärke ergibt, dadurch gekennzeichnet, daß bei noch heißer Pfanne die an der inneren Oberfläche noch anhaftende Schlak- ke von der verbliebenen Auskleidung mit Hilfe eines reduzie¬ rend arbeitenden Hochtemperaturbrenners abgeschmolzen und in schmelzflüssigem Zustand aus der Pfanne auslaufen gelas¬ sen wird und daß nach Abkühlung die glasige Oberfläche der verbliebenen Auskleidung aufgerauht wird, worauf die Auf¬ bringung der neuen feuerfesten Auskleidung erfolgt.1. A method for restoring the refractory lining of a pan for casting steel and similar metallurgical vessels, in which after a pan trip the adhering slag and possibly the top layers of the old lining soaked in slag are removed and a new refractory additional lining is placed on the old lining Casting process is brought up which, together with the old lining, results in a total refractory lining in the original wall thickness, characterized in that when the pan is still hot, the slag of the remaining lining still adhering to the inner surface is reduced by means of a ¬ rend working high-temperature burner is melted and run out of the pan in the molten state and that after cooling the glassy surface of the remaining lining is roughened, whereupon the new refractory lining is applied.
2. Verfahren nach Anspruch 1, dadurch gekennzeich¬ net, daß das Abschmelzen der Schlacke bei liegender und ein leichtes Gefälle nach außen aufweisender Pfanne er¬ folgt.2. The method according to claim 1, characterized gekennzeich¬ net that the melting of the slag with lying and a slight slope outward pan follows er¬.
3. Verfahren nach Anspruch 1 oder 2 , dadurch gekenn¬ zeichnet, daß der Brenner mit reinem Sauerstoff betrieben wird. 3. The method according to claim 1 or 2, characterized gekenn¬ characterized in that the burner is operated with pure oxygen.
4. Anlage zur Wiederherstellung der feuerfesten Aus¬ kleidung von Pfannen zum Vergießen von Stahl und ähnlichen metallurgischen Gefäßen nach dem Verfahren der Ansprüche4. Plant for restoring the refractory lining of pans for casting steel and similar metallurgical vessels according to the method of the claims
1 bis 3, gekennzeichnet durch folgende Anlagenteile; a) ein Stand (4), auf dem die Pfanne (10) liegend, je¬ doch ein leichtes Gefälle (5) nach außen aufweisend ableg¬ bar ist; b) ein in die Pfanne (10) einführbarer, reduzierend arbeitender Hochtemperaturbrenner (9); c) eine Einrichtung (16) zur Aufnahme aus der Pfannen¬ öffnung (6) auslaufender schmelzflüssiger Schlacke; d) eine in die Pfanne (10) einführbare Aufrauhvorrich¬ tung (20) für die Oberfläche der verbliebenen Auskleidung (2); e) eine in die aufrechte Pfanne einsenkbare Schablone (27) für die Innengestalt der Auskleidung (2) und eine Zu¬ führvorrichtung (29), mittels deren die Auskleidungsmasse (30) in den Zwischenraum (32) zwischen der inneren Ober¬ fläche (26) der alten Auskleidung (2) und der Schablone (27) einbringbar ist.1 to 3, characterized by the following system parts; a) a stand (4), on which the pan (10) lies, but a slight downward slope (5) can be placed on the outside; b) a reducing high-temperature burner (9) which can be inserted into the pan (10); c) a device (16) for receiving molten slag running out of the pan opening (6); d) a roughening device (20) which can be inserted into the pan (10) for the surface of the remaining lining (2); e) a template (27) which can be lowered into the upright pan for the interior of the lining (2) and a feed device (29) by means of which the lining composition (30) into the space (32) between the inner surface (26 ) the old lining (2) and the template (27) can be introduced.
5. Anlage nach Anspruch 4, dadurch gekennzeichnet, daß der Hochtemperaturbrenner (9) in der Pfanne (10) an einer verschwenkbaren, drehbaren und in Tiefenrichtung der Pfanne (10) verlagerbaren Lanze (8) über die innere Ober¬ fläche (26) der Pfanne (10) führbar ist.5. Plant according to claim 4, characterized in that the high-temperature burner (9) in the pan (10) on a pivotable, rotatable and in the depth direction of the pan (10) displaceable lance (8) over the inner surface (26) of the Pan (10) is feasible.
6. Anlage nach Anspruch 4 oder 5, dadurch gekennzeich¬ net, daß ein Hitzeschild (14) zum Abschließen des Pfannen- innern nach außen bei eingeführtem Hochtemperaturbrenner (9) vorgesehen ist.6. Plant according to claim 4 or 5, characterized gekennzeich¬ net that a heat shield (14) is provided for closing the interior of the pan to the outside with an inserted high-temperature burner (9).
7. Anlage nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Aufrauhvorrichtung (20) mit Hart¬ metallzapfen (24) bestückte, unter Vibrationseinwirkung stehende Rollen (23) umfaßt, die an Haltearmen (22) rol¬ lend konturgetreu über die innere Oberfläche (26) der alten Auskleidung (2) führbar sind. 7. Installation according to one of claims 4 to 6, characterized in that the roughening device (20) with Hart¬ metal pin (24) equipped, vibrating rollers (23), the holding arms (22) roll-true to the contour inner surface (26) of the old lining (2) are feasible.
EP91901674A 1990-02-07 1991-01-14 Process and installation for renewing the refractory lining of foundry ladles Expired - Lifetime EP0514383B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003646 1990-02-07
DE4003646A DE4003646C1 (en) 1990-02-07 1990-02-07

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EP0514383B1 EP0514383B1 (en) 1993-10-20

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US (1) US5330690A (en)
EP (1) EP0514383B1 (en)
JP (1) JPH0798266B2 (en)
AT (1) ATE96065T1 (en)
AU (1) AU636704B2 (en)
BR (1) BR9105928A (en)
CA (1) CA2075484C (en)
DE (2) DE4003646C1 (en)
DK (1) DK0514383T3 (en)
ES (1) ES2046886T3 (en)
GR (1) GR1001444B (en)
TR (1) TR26175A (en)
WO (1) WO1991012103A1 (en)
ZA (1) ZA91454B (en)

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EP0514383B1 (en) 1993-10-20
GR910100048A (en) 1992-06-30
JPH0798266B2 (en) 1995-10-25
GR1001444B (en) 1993-12-30
ES2046886T3 (en) 1994-02-01
AU636704B2 (en) 1993-05-06
CA2075484C (en) 2001-03-20
ZA91454B (en) 1991-11-27
US5330690A (en) 1994-07-19
ATE96065T1 (en) 1993-11-15
AU7046291A (en) 1991-09-03
JPH05503879A (en) 1993-06-24
DE59100509D1 (en) 1993-11-25
TR26175A (en) 1995-02-15
DE4003646C1 (en) 1990-12-13
DK0514383T3 (en) 1994-03-21
WO1991012103A1 (en) 1991-08-22
CA2075484A1 (en) 1991-08-08
BR9105928A (en) 1992-11-03

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