EP0095436A1 - Gas-permeable refractory bodies - Google Patents

Gas-permeable refractory bodies Download PDF

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Publication number
EP0095436A1
EP0095436A1 EP83630093A EP83630093A EP0095436A1 EP 0095436 A1 EP0095436 A1 EP 0095436A1 EP 83630093 A EP83630093 A EP 83630093A EP 83630093 A EP83630093 A EP 83630093A EP 0095436 A1 EP0095436 A1 EP 0095436A1
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EP
European Patent Office
Prior art keywords
gas
metal
segments
structure according
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
EP83630093A
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German (de)
French (fr)
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EP0095436B1 (en
Inventor
François Schleimer
Guy Denier
Romain Henrion
Jean Goedert
Ferdinand Goedert
Henri Klein
Josef Auer
Berndt Wendl
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Institut de Recherches de la Siderurgie Francaise IRSID
Arcelor Luxembourg SA
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
Arbed SA
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Priority to AT83630093T priority Critical patent/ATE23196T1/en
Publication of EP0095436A1 publication Critical patent/EP0095436A1/en
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    • 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
    • C21C5/48—Bottoms or tuyéres of converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the invention relates to refractory, gas-permeable structures for blowing gases into metal treatment vessels, through the lining thereof.
  • the oxygen blowing process used for fresh iron refreshing has recently been improved in terms of metallurgy in such a way that secondary gases such as nitrogen or argon are blown in in a controlled manner through the converter base. Also in oxygen bottom blowing processes and in metal treatment vessels, such as oven pans, desulfurization pans and the like. Like., the blowing of gases into the metal bath through the vessel bottom or the lining of the vessel walls into consideration.
  • the gas-permeable bricks to be inserted into the lining of the vessel are required to have a durability which corresponds to that of the other refractory lining, since it is difficult to replace worn-out gas blowing stones when hot.
  • the introduction of gas should be possible both continuously and in particular discontinuously, i.e. the vessel should also be operable without the introduction of gas and after the gas supply is switched on again, the stones should be permeable to gas in an unchanged manner.
  • the gas permeability of the stones over their service life, i.e. over an entire oven trip remain essentially the same.
  • This device essentially consists of a refractory, gas-permeable structure, wherein a plurality of flat, corrugated, tubular or wire-shaped metallic separating members of small wall thickness are embedded in the refractory material in the axial direction.
  • this structure consists of steel sheets and S e g-Nenten or strips of refractory material in an alternating arrangement.
  • the applicant has improved the refractory structures to the effect that the segments are produced in molds, with metal layers being pressed with the refractory material.
  • the adjacent longitudinal surfaces of the segments can be smooth or profiled, e.g. corrugated or grooved surface.
  • the aim of the invention is to propose fireproof, gas-permeable structures consisting of segments, the segments of which do not react significantly with the purge gas used, which can sometimes have an oxidizing effect.
  • the structure according to the invention consequently allows any gas to be blown into the converter which, at its normal operating temperature, does not make any connections with the selected coating.
  • the exact composition and grain structure of the spring-loaded mass are of minor importance.
  • the mass primarily gives the coating a hold and also prevents it from overheating by dissipating the heat to the cold side of the structure.
  • One of the most important Properties of the refractory material is a low or the expansion coefficient adapted to the coating in order to avoid premature cracking in the building.
  • Suitable refractory materials are, for example, tar-bound sintered magnesia, high-alumina material or mixtures of magnesia and chrome ore.
  • the structure 1 shown in FIG. 1 has a metal housing 10, which is made up of welded plates and surrounds a total of twelve segments 3. Each segment is provided with metal supports 4, 4a on all four long sides. The sheets are corrugated on two long sides, while the sheets on the other two sides are flat. The segments are installed in such a way that a corrugated sheet 4a is in contact with a flat sheet 4.
  • the plates of the metal housing 10 should preferably not have any corrugated metal sheets opposite them.
  • a sheet metal plate 5 may possibly be inserted between the two rows of the segments 3, along which a gas passage takes place along as well as along the metal supports 4, 4a of the segments 3.
  • the segments are spaced from the end face of the metal housing by means of two strips 6, which are arranged on the inside of the metal housing 10 and are preferably attached to it by spot welding.
  • an end plate 7 is welded tight, which is provided with a pipe connection 8.
  • the space that remains free between the end plate and the end faces of the segments 3 is the distribution space for the gas.
  • the refractory mass 9 is provided on the cold end face of the segments 3 with a protective sheet (not shown).
  • the opposite, invisible side represents the fire side of the building and can be closed with a cover plate.
  • the latter is used if the infeed of the metal treatment vessel surrounding the structure contains tar or similar carbon carriers. It then serves to prevent the penetration of tar or the like into the gas passage joints of the structure or the sticking thereof during the heating of the vessel.
  • the cover plate melts at the start of operation and releases the joints.
  • only three elongated cuboid segments 3 are arranged one above the other in the metal housing 10.
  • the five sheets that surround one of the segments are all flat here, while in the two remaining segments only one large long side is provided with a corrugated sheet and the other three long sides (as well as the cold side) have flat sheets.
  • the three segments are arranged in the metal housing in such a way that no corrugated sheet metal is in contact with it.
  • FIG. 2 shows a section through a segment 23, the refractory mass 29 of which is surrounded on all four sides and the cold end face (not shown) with flat steel sheets 24.
  • the flat sheets are provided with longitudinal metal strips 22, the strips being staggered on two opposite sides.
  • the strips 22 can be attached to the sheet by spot welding. The thickness of these strips allows the degree of gas permeability to be varied. However, the strips must not be chosen too thick in order to be able to operate the building without gas supply. Some metal penetrates the narrow gap between the segments; when the gas supply line is switched on again, this penetrated metal is flushed out of the building and the original gas permeability is restored. This surprising effect only occurs if the metal strips are not too thick.
  • the refractory mass 39 is surrounded by sheets 34 which are provided with longitudinal bars 32.
  • the longitudinal bars are staggered on opposite sheets. The bars can easily be rolled into the sheet.
  • FIG. 4 shows a segment 43, the refractory mass 49 of which is surrounded on all sides with steel sheets 44.
  • the gas throughput takes place primarily through grooves 42 milled into the sheet 44.
  • the refractory mass 59 is surrounded on all sides by flat sheets 54.
  • the distance between two segments is set by means of a mat-like structure 52 made of steel wool.
  • sheet steel is used as the coating of the refractory mass.
  • the sheet is rolled into the required shape, cut to size, bent and welded.
  • FIG. 6 Refractory material is first introduced into a press mold.
  • the mold provides the refractory material with bars, grooves or waves.
  • the elongated cuboid elements are painted.
  • the liquid used can be, for example, a metal paint with a ceramic binding material or a ceramic paint.
  • the two segments 63 shown in FIG. 6 have a coating 64 which was produced by immersing the corrugated refractory material 69 in a metal paint bath. After immersion, the segments are annealed depending on the selected metal color. It may be necessary to repeat the immersion annealing process several times until the desired coating thickness is reached.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

1. Refractory gas-permeable structural unit (1) for blowing gas into a metallurgical vessel through its lining, comprising at least two elements (3, 23, 33, 43, 53, 63) having a core of refractory non-porous material (9, 29, 39, 49, 59, 69), said elements abutting against one another with their longitudinal faces, a common metal housing (10) surrounding the longitudinal faces of said elements with at one of the end faces of the unit (1), at least one gas connection (8) and a gas distribution chamber, characterized in that the elements are provided at least on all their longitudinal faces with a gas-tight cover.

Description

Die Erfindung betrifft feuerfeste, gasdurchlässige Baukörper Zum Einblasen von Gasen in Metallbehandlungsgefässe, durch deren Auskleidung hindurch.The invention relates to refractory, gas-permeable structures for blowing gases into metal treatment vessels, through the lining thereof.

Die zum Roheisenfrischen dienenden Sauerstoffaufblas-Verfahren, wurden neuerdings in metallurgischer Hinsicht dahingehend verbessert, dass durch den Konverterboden Sekundärgase, wie Stickstoff oder Argon, gesteuert eingeblasen werden. Auch bei Sauerstoff-Bodenblasverfahren sowie in Metallbehandlungsgefässen, wie etwa Ofenpfannen, Entschwefelungspfannen u. dgl., kommt das Einblasen von Gasen in das Metallbad durch den Gefässboden oder die Auskleidung der Gefässwände hindurch in Betracht.The oxygen blowing process used for fresh iron refreshing has recently been improved in terms of metallurgy in such a way that secondary gases such as nitrogen or argon are blown in in a controlled manner through the converter base. Also in oxygen bottom blowing processes and in metal treatment vessels, such as oven pans, desulfurization pans and the like. Like., the blowing of gases into the metal bath through the vessel bottom or the lining of the vessel walls into consideration.

An die in die Auskleidung des Gefässes einzusetzenden gasdurchlässigen Steine wird die Forderung gestellt, dass ihre Haltbarkeit derjenigen der übrigen feuerfesten Auskleidung entspricht, da ein Auswechseln verschlissener Gasdurchblassteine im heissen Zustand schwierig ist. Ferner soll die Gaseinleitung sowohl kontinuierlich als insbesondere auch diskontinuierlich möglich sein, d.h. das Gefäss soll auch ohne Gaseinleitung betreibbar sein und nach dem Wiedereinschalten der Gaszufuhr sollen die Steine in unveränderter Weise gasdurchlässig sein. Ausserdem soll die Gasdurchlässigkeit der Steine über ihre Gebrauchsdauer, d.h. über eine ganze Ofenreise, im wesentlichen gleich bleiben.The gas-permeable bricks to be inserted into the lining of the vessel are required to have a durability which corresponds to that of the other refractory lining, since it is difficult to replace worn-out gas blowing stones when hot. Furthermore, the introduction of gas should be possible both continuously and in particular discontinuously, i.e. the vessel should also be operable without the introduction of gas and after the gas supply is switched on again, the stones should be permeable to gas in an unchanged manner. In addition, the gas permeability of the stones over their service life, i.e. over an entire oven trip, remain essentially the same.

In der Patentanmeldung LU 81.208 hat die Anmelderin eine zum Einsetzen in den Boden eines Metallbehandlungsgefässes bestimmte Vorrichtung zum Einblasen eines Behandlungsgases in ein Metallbad aufgezeigt, welche eine gute Haltbarkeit besitzt und das Einblasen der gewünschten Gasmengen gestattet. Diese Vorrichtung besteht im wesentlichen in einem feuerfesten, gasdurchlässigen Baukörper, wobei in das feuerfeste Material in axialer Richtung eine Mehrzahl von ebenen, gewellten, rohrförmigen oder drahtförmigen metallischen Trenngliedern von geringer Wandstärke eingebettet ist. Nach einer Ausführungsform besteht dieser Baukörper aus Stahlblechen und Seg-Nenten oder Streifen aus feuerfestem Material in abwechselnder Anordnung.In patent application LU 81.208, the applicant has a proposal for insertion into the bottom of a metal treatment vessel Direction for blowing a treatment gas shown in a metal bath, which has a good durability and allows the blowing in of the desired amounts of gas. This device essentially consists of a refractory, gas-permeable structure, wherein a plurality of flat, corrugated, tubular or wire-shaped metallic separating members of small wall thickness are embedded in the refractory material in the axial direction. According to one embodiment, this structure consists of steel sheets and S e g-Nenten or strips of refractory material in an alternating arrangement.

Da zur Herstellung solcher Baukörper ein vorgefertigter Block aus feuerfestem Material in die erforderlichen Streifen oder Segmente zerschnitten werden muss, ist das ein sehr aufwendiges Verfahren. Durch Verpressen von feuerfestem Material hergestellte Segmente sind, bedingt durch ihre geringe Dicke und grosse Länge, nicht hinreichend handhabungsfähig und verziehen sich, falls sie einem Steinbrand unterworfen werden.Since a prefabricated block of refractory material has to be cut into the required strips or segments in order to produce such structures, this is a very complex process. Segments produced by pressing refractory material are, due to their small thickness and great length, not sufficiently manageable and distort if they are subjected to a stone fire.

In den Patentanmeldungen LU 82.552, LU 82.553 und LU 82.554 hat die Anmelderin die feuerfesten Baukörper dahingehend verbessert, dass die Segnente in Pressformen hergestellt werden, wobei Metall-Lagen mit den feuerfesten Material mitverpresst werden. Die aneinandergrenzenden Längsflächen der Segmente können dabei mit glatter oder mit profilierter, z.B. gewellter oder gerillter Oberfläche ausgebildet sein.In the patent applications LU 82.552, LU 82.553 and LU 82.554, the applicant has improved the refractory structures to the effect that the segments are produced in molds, with metal layers being pressed with the refractory material. The adjacent longitudinal surfaces of the segments can be smooth or profiled, e.g. corrugated or grooved surface.

Beim Zusammenbau der mit profilierten Metallauflagen versehenen Segmente entstehen im Baukörper Fugen, Kanäle, usw. durch welche der Gaszugang erfolgt, wobei die profilierten Längsflächen sowohl an einer glatten, als auch an einer profilierten Längsfläche des Nachbarsegments anliegen können. Die anliegende Längsfläche des Nachbarsegments kann ihrerseits mit einer mitverpressten Metallauflage versehen sein oder sie kann auflagenfrei sein. Auch können in einzelne Segmente mitverpresste Paare von aneinanderliegenden Metalleinlagen, z.B. Blechplatten, eingebettet werden. Dabei können zwischen den Metallplatten eines Einlagenpaares Distanzhalter angeordnet sein. Feuerfeste Baukörper der soeben beschriebenen Art arbeiten zufriedenstellend, wenn man als Spülgas Argon oder Stickstoff verwendet. Leider ist Argon ein sehr teures Gas. Reiner Stickstoff ist zwar billiger, löst sich aber bei hohen Temperaturen im flüssigen Stahl, was nachteilige Wirkungen auf die Stahlgüte mit sich bringt.When assembling the segments provided with profiled metal supports, joints, channels, etc. are created in the structure through which the gas can be accessed, whereby the profiled longitudinal surfaces can rest against both a smooth and a profiled longitudinal surface of the neighboring segment. The adjacent longitudinal surface of the neighboring segment can in turn be provided with a pressed-on metal support or it can be free of supports. Pairs of adjacent metal inserts, for example sheet metal plates, which have been pressed together, can also be embedded in individual segments. Spacers can be arranged between the metal plates of a pair of inserts. Refractory structures of the type just described work satisfactorily when argon or nitrogen is used as the purge gas. Unfortunately, argon is a very expensive gas. Pure nitrogen is cheaper, but dissolves at high temperatures in the liquid steel, which has adverse effects on the steel grade.

Die Anmelderin hat demzufolge Versuche unternommen andere Gase, wie beispielsweise Kohlendioxyd, durch die Blassteine in den Konverter einzublasen, wobei ein schneller Verschleiss der feuerfesten Steine festgestellt werden musste und wobei die feuerfeste Masse schon nach wenigen Chargen zerkrümelte. Ausserdem wurde festgestellt, dass die Zersetzung des feuerfesten Materials vornehmlich von der warmen Seite des Baukörpers her erfolgt. Die dort herrschende Temperatur bewirkt scheinbar Reaktionen wie CO2+ C . 2 C0, wobei das C-Atom aus dem kohlenstoffhaltigen Bindemittel der feuerfesten Masse stammt. Daneben wird angenommen, dass auch Reaktionen wie C02 + MgO = MgC03 ablaufen. Auch dies könnte das ZerkrUmeln der Steinmasse erklären.The applicant has therefore made attempts to inject other gases, such as carbon dioxide, through the blowing stones into the converter, with rapid wear of the refractory bricks having to be found and the refractory mass crumbling after just a few batches. It was also found that the refractory material decomposed primarily from the warm side of the building. The temperature there appears to cause reactions such as CO 2 + C. 2 C0, the carbon atom originating from the carbon-containing binder of the refractory mass. In addition, it is assumed that reactions such as C0 2 + MgO = MgC0 3 also take place. This could also explain the crumbling of the stone mass.

Das Ziel der Erfindung besteht darin feuerfeste, gasdurchlässige, aus Segmenten bestehende Baukörper vorzuschlagen, deren Segmente nicht wesentlich mit dem verwendeten Spülgas, das mitunter oxydierend wirken kann, reagieren.The aim of the invention is to propose fireproof, gas-permeable structures consisting of segments, the segments of which do not react significantly with the purge gas used, which can sometimes have an oxidizing effect.

Dieses Ziel wird durch die erfindungsgemässen Baukörper erreicht, dessen Segmente zumindest auf den Längsflächen mit einem gasdichten Ueberzug versehen sind. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.This goal is achieved by the building structure according to the invention, the segments of which are provided with a gas-tight coating at least on the longitudinal surfaces. Further advantageous embodiments of the invention are described in the subclaims.

Der erfindungsgemässe Baukörper erlaubt folglich das Einblasen in den Konverter von jeglichem Gas, das bei seiner normalen Betriebstemperatur nicht mit dem gewählten Ueberzug irgendwelche Verbindungen eingeht. Die genaue Zusammensetzung und der Kornaufbau der federfesten Masse werden hierdurch von untergeordneter Bedeutung.The structure according to the invention consequently allows any gas to be blown into the converter which, at its normal operating temperature, does not make any connections with the selected coating. The exact composition and grain structure of the spring-loaded mass are of minor importance.

Die Masse verleiht in erster Linie dem Ueberzug Halt und vermeidet darUber hinaus eine Ubermässige Erhitzung desselben durch Ableiten der Wärme zur kalten Seite des Baukörpers hin. Eine der wichtigsten Eigenschaften des feuerfesten Materials ist ein niedriger oder dem Ueberzug angepasster Ausdehnungskoeffizient, um vorzeitige Rissbildungen in dem Baukörper zu vermeiden. Geeignete feuerfeste Stoffe sind beispielsweise teergebundene Sintermagnesia, Hochtonerdematerial oder Mischungen von Magnesia und Chromerz.The mass primarily gives the coating a hold and also prevents it from overheating by dissipating the heat to the cold side of the structure. One of the most important Properties of the refractory material is a low or the expansion coefficient adapted to the coating in order to avoid premature cracking in the building. Suitable refractory materials are, for example, tar-bound sintered magnesia, high-alumina material or mixtures of magnesia and chrome ore.

Die Erfindung wird anhand von einige Ausführungswege darstellende Zeichnungen näher erläutert. Es zeigen :

  • Die Fig. l eine perspektivische Ansicht eines erfindungsgemässen Baukörpers und die Fig. 2 bis 6 perspektivische Schnitte durch einzelne erfindungsgemässe Segmente.
The invention will be explained in more detail with reference to drawings which illustrate some possible embodiments. Show it :
  • FIG. 1 shows a perspective view of a structure according to the invention and FIGS. 2 to 6 show perspective sections through individual segments according to the invention.

Der in der Fig. 1 dargestellte Baukörper 1 weist ein aus miteinander verschweissten Platten aufgebautes Metallgehäuse 10 auf, das insgesamt zwölf Segmente 3 umgibt. Jedes Segment ist auf allen vier Längsseiten mit Metallauflagen 4, 4a versehen. Auf zwei Längsseiten sind die Bleche gewellt während auf den zwei übrigen Seiten die Bleche flach ausgeführt sind. Die Segmente sind so eingebaut, dass jeweils ein gewelltes Blech 4a mit einem flachen Blech 4 in Kontakt liegt. Um ein Aufblähen des Metallgehäuses zu vermeiden, sollten den Platten des Metallgehäuses 10, möglichst keine gewellten Bleche gegenüberliegen. Zwischen den beiden Reihen der Segmente 3 kann eventuell eine Blechplatte 5 eingelegt sein, längs welcher ebenso wie längs der Metallauflagen 4, 4a der Segmente 3 ein Gasdurchgang erfolgt. Die Segmente sind mittels zweier Leisten 6, die an der Innenseite des Metallgehäuses 10 angeordnet und vorzugsweise an diesem durch Punktschweissen befestig sind, von der Stirnseite des Metallgehäuses beabstandet. An dieser Stelle, die die Kaltseite darstellt, ist eine Stirnplatte 7 dicht angeschweisst, welche mit einem Rohranschluss 8 versehen ist. Der zwischen der Stirnplatte und den Stirnseiten der Segmente 3 freibleibende Raum ist der Verteilungsraum für das Gas. Die feuerfeste Masse 9 ist auf der kalten Stirnseite der Segmente 3 mit einem (nicht gezeigten) schUtzenden.Blech versehen. Auf der kalten Seite des Baukörpers 1 herrschen Temperaturen von 300-500°C bei denen beispielsweise Kohlendioxyd die feuerfeste Masse nur sehr langsam angreift, doch ist auch hier ein schützender Ueberzug von Vorteil. Die gegenüberliegende, nicht sichtbare Seite stellt die Feuerseite des Baukörpers dar und kann mit einem Abdeckblech verschlossen sein. Letzteres wird angewendet, wenn die den Baukörper umgebende Zustellung des Metallbehandlungsgefässes Teer oder ähnliche Kohlenstoffträger enthält. Es dient dann dazu, während des Aufheizens des Gefässes das Eindringen von Teer oder dgl. in die Gasdurchgangsfugen des Baukörpers oder das Verkleben derselben zu verhindern. Das Abdeckblech schmilzt bei Betriebsbeginn ab und gibt die Fugen frei.The in the Fig . The structure 1 shown in FIG. 1 has a metal housing 10, which is made up of welded plates and surrounds a total of twelve segments 3. Each segment is provided with metal supports 4, 4a on all four long sides. The sheets are corrugated on two long sides, while the sheets on the other two sides are flat. The segments are installed in such a way that a corrugated sheet 4a is in contact with a flat sheet 4. In order to prevent the metal housing from inflating, the plates of the metal housing 10 should preferably not have any corrugated metal sheets opposite them. A sheet metal plate 5 may possibly be inserted between the two rows of the segments 3, along which a gas passage takes place along as well as along the metal supports 4, 4a of the segments 3. The segments are spaced from the end face of the metal housing by means of two strips 6, which are arranged on the inside of the metal housing 10 and are preferably attached to it by spot welding. At this point, which represents the cold side, an end plate 7 is welded tight, which is provided with a pipe connection 8. The space that remains free between the end plate and the end faces of the segments 3 is the distribution space for the gas. The refractory mass 9 is provided on the cold end face of the segments 3 with a protective sheet (not shown). On the cold side of the building 1 there are temperatures of 300-500 ° C at which, for example, carbon dioxide only very slowly attacks the refractory mass, but there is also one here protective coating is an advantage. The opposite, invisible side represents the fire side of the building and can be closed with a cover plate. The latter is used if the infeed of the metal treatment vessel surrounding the structure contains tar or similar carbon carriers. It then serves to prevent the penetration of tar or the like into the gas passage joints of the structure or the sticking thereof during the heating of the vessel. The cover plate melts at the start of operation and releases the joints.

Bei einer vorteilhaften Variante des Baukörpers ordnet man lediglich drei längliche quaderförmige Segmente 3 übereinander im Metallgehäuse 10 an. Die fünf Bleche, welche eines der Segmente umgeben, sind hier alle flach ausgebildet, während bei den zwei übrigen Segmenten lediglich eine grosse Längsseite mit einem gewellten Blech versehen ist und die drei anderen Längsseiten (sowie die Kaltseite) flache Bleche besitzen. Die drei Segmente sind derart im Metallgehäuse angeordnet, dass kein gewellter Blech mit diesem in Kontakt liegt.In an advantageous variant of the structure, only three elongated cuboid segments 3 are arranged one above the other in the metal housing 10. The five sheets that surround one of the segments are all flat here, while in the two remaining segments only one large long side is provided with a corrugated sheet and the other three long sides (as well as the cold side) have flat sheets. The three segments are arranged in the metal housing in such a way that no corrugated sheet metal is in contact with it.

Die Fig. 2 zeigt einen Schnitt durch ein Segment 23, dessen feuerfeste Masse 29 auf allen vier Seiten und der (nicht dargestellten) kalten Stirnseite, mit flachen Stahlblechen 24 umgeben ist. Die flachen Bleche sind mit metallischen Längsstreifen 22 versehen, wobei die Streifen auf zwei gegenüberliegenden Seiten versetzt angeordnet sind. Die Streifen 22 können durch Punktschweissen auf dem Blech befestigt werden. Durch die Dicke dieser Streifen kann das Ausmass der Gasdurchlässigkeit variiert werden. Allerdings dürfen die Streifen nicht zu dick gewählt werden, um die Baukörper auch ohne Gaszufuhr betreiben zu können. Dabei dringt zwar etwas Metall in den engen Spalt zwischen die Segmente ein; beim Wiedereinschalten der Gaszuleitung wird dieses eingedrungene Metall aber wieder aus dem Baukörper gespült und die ursprüngliche Gasdurchlässigkeit stellt sich wieder ein. Dieser überraschende Effekt setzt nur ein, wenn die Blechstreifen nicht zu dick sind.FIG. 2 shows a section through a segment 23, the refractory mass 29 of which is surrounded on all four sides and the cold end face (not shown) with flat steel sheets 24. The flat sheets are provided with longitudinal metal strips 22, the strips being staggered on two opposite sides. The strips 22 can be attached to the sheet by spot welding. The thickness of these strips allows the degree of gas permeability to be varied. However, the strips must not be chosen too thick in order to be able to operate the building without gas supply. Some metal penetrates the narrow gap between the segments; when the gas supply line is switched on again, this penetrated metal is flushed out of the building and the original gas permeability is restored. This surprising effect only occurs if the metal strips are not too thick.

Bei dem in der Fig. 3 dargestellten Segment 33 ist die feuerfeste Masse 39 von Blechen 34 umgeben, die mit Längsriegeln 32 versehen sind. Die Längsriegel sind auf sich gegenUberliegenden Blechen versetzt angeordnet. Die Riegel können auf einfache Art in das Blech gewalzt werden.In the segment 33 shown in FIG. 3, the refractory mass 39 is surrounded by sheets 34 which are provided with longitudinal bars 32. The longitudinal bars are staggered on opposite sheets. The bars can easily be rolled into the sheet.

In der Fig. 4 ist ein Segment 43 dargestellt, dessen feuerfeste Masse 49 auf allen Seiten mit Stahlblechen 44 umgeben ist. Der Gasdurchsatz erfolgt in dieser AusfUhrung vornehmlich durch in das Blech 44 gefräste Rillen 42.4 shows a segment 43, the refractory mass 49 of which is surrounded on all sides with steel sheets 44. In this embodiment, the gas throughput takes place primarily through grooves 42 milled into the sheet 44.

Bei dem in der Fig. 5 dargestellten Segment 53 ist die feuerfeste Masse 59 allseitig von flachen Blechen 54 umgeben. Der Abstand zwischen zwei Segmenten wird mittels eines mattenähnlichen Gebildes 52 aus Stahlwolle eingestellt.In the segment 53 shown in FIG. 5, the refractory mass 59 is surrounded on all sides by flat sheets 54. The distance between two segments is set by means of a mat-like structure 52 made of steel wool.

Bei den bisher beschriebenen Segmenten wird als Ueberzug der feuerfesten Masse Stahlblech verwendet. Das Blech wird hierbei in die benötigte Form gewalzt, zurechtgeschnitten, gebogen und verschweisst.In the segments described so far, sheet steel is used as the coating of the refractory mass. The sheet is rolled into the required shape, cut to size, bent and welded.

Eine andere vorteilhafte Ausgestaltung der Erfindung zeigt die Fig. 6. Feuerfestes Material wird hierbei zuerst in eine Pressform eingeführt. Die Pressform versieht das feuerfeste Material mit Riegeln, Rillen oder Wellen. Nach einer kurzen thermischen Behandlung, die eventuell notwendig ist um das Material zu verfestigen, werden die länglichen quaderförmigen Elemente mit einem Anstrich versehen. Die verwendete Flüssigkeit kann beispielsweise eine Metallfarbe mit einem keramischen Bindematerial sein oder eine Keramikfarbe. Die beiden auf Fig. 6 dargestellten Segmente 63 besitzen einen Ueberzug 64 der durch Eintauchen des gewellten feuerfesten Materials 69 in ein Metallfarbbad hergestellt wurde. Nach dem Eintauchen werden die Segmente in Abhängigkeit von der gewählten Metallfarbe getempert. Es kann eventuell notwendig sein, den Eintauch-Temperprozess mehrere Male zu wiederholen, bis die gewünschte Dicke des Ueberzugs erreicht ist.Another advantageous embodiment of the invention is shown in FIG. 6. Refractory material is first introduced into a press mold. The mold provides the refractory material with bars, grooves or waves. After a short thermal treatment, which may be necessary to solidify the material, the elongated cuboid elements are painted. The liquid used can be, for example, a metal paint with a ceramic binding material or a ceramic paint. The two segments 63 shown in FIG. 6 have a coating 64 which was produced by immersing the corrugated refractory material 69 in a metal paint bath. After immersion, the segments are annealed depending on the selected metal color. It may be necessary to repeat the immersion annealing process several times until the desired coating thickness is reached.

Claims (9)

1. Feuerfeste, gasdurchlässiger Baukörper, zum Einblasen von Gasen in Metallbehandlungsgefässe durch deren Auskleidung hindurch, wobei der Baukörper aus wenigstens zwei aneinanderliegenden Segmenten besteht, welche einen Kern aus feuerfestem Material aufweisen, dadurch gekennzeichnet, dass die Segmente zumindest auf allen ihren Längsseiten mit einem gasdichten Ueberzug versehen sind.1. Refractory, gas-permeable structure, for blowing gases into metal treatment vessels through their lining, the structure consisting of at least two adjacent segments which have a core made of refractory material, characterized in that the segments have a gas-tight at least on all their long sides Are provided. 2. Baukörper nach dem Anspruch 1, dadurch gekennzeichnet, dass der Ueberzug aus Metallblech besteht.2. Building structure according to claim 1, characterized in that the coating consists of sheet metal. 3. Baukörper nach dem Anspruch 2, dadurch gekennzeichnet, dass das Metallblech mit Rillen, Riegeln oder Wellen versehen ist.3. Building structure according to claim 2, characterized in that the metal sheet is provided with grooves, bars or waves. 4. Baukörper nach dem Anspruch 2, dadurch gekennzeichnet, dass zwischen den Segmenten Distanzhalter, gegebenenfalls in der Form von Metallstreifen, Drähten oder Stahlwolle eingebettet sind.4. Building structure according to claim 2, characterized in that between the segments spacers, optionally in the form of metal strips, wires or steel wool are embedded. 5. Baukörper nach dem Anspruch 2, dadurch gekennzeichnet, dass das Metallblech Stahlblech ist, das mit einem Oberflächenschutz versehen sein kann.5. Building structure according to claim 2, characterized in that the metal sheet is steel sheet, which can be provided with a surface protection. 6. Baukörper nach dem Anspruch 1, dadurch gekennzeichnet, dass der gasdichte Ueberzug aus einer Metallfarbe besteht.6. Structure according to claim 1, characterized in that the gas-tight coating consists of a metal color. 7. Baukörper nach dem Anspruch 1, dadurch gekennzeichnet, dass der gasdichte Ueberzug aus einer Keramikfarbe besteht.7. Building structure according to claim 1, characterized in that the gas-tight coating consists of a ceramic paint. 8. Baukörper nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass die Segmente allseitig, mit Ausnahme der mit dem flüssigen Metall in Kontakt kommenden Feuerseite, mit einem gasdichten Ueberzug versehen sind.8. Building structure according to one of claims 1-7, characterized in that the segments are provided on all sides, with the exception of the fire side coming into contact with the liquid metal, with a gas-tight coating. 9. Baukörper nach einem der Ansprüche 1-8, dadurch gekennzeichnet, dass er aus drei oder vier Segmenten besteht.9. Structure according to one of claims 1-8, characterized in that it consists of three or four segments.
EP83630093A 1982-05-25 1983-05-20 Gas-permeable refractory bodies Expired EP0095436B1 (en)

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AT83630093T ATE23196T1 (en) 1982-05-25 1983-05-20 FIRE-RESISTANT, GAS-PERMEABLE STRUCTURE.

Applications Claiming Priority (2)

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LU84167 1982-05-25
LU84167A LU84167A1 (en) 1982-05-25 1982-05-25 FIRE-RESISTANT, GAS-PERMEABLE CONSTRUCTION

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EP0095436B1 EP0095436B1 (en) 1986-10-29

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JP (2) JPS58210113A (en)
KR (1) KR910009493B1 (en)
AR (1) AR229811A1 (en)
AT (1) ATE23196T1 (en)
AU (1) AU557537B2 (en)
BR (1) BR8302619A (en)
CA (1) CA1229228A (en)
DE (1) DE3367257D1 (en)
ES (1) ES522666A0 (en)
IN (1) IN157467B (en)
LU (1) LU84167A1 (en)
MX (1) MX158037A (en)
PT (1) PT76732B (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146079A2 (en) * 1983-12-12 1985-06-26 Arbed S.A. Gas-permeable refractory plug
WO1992004473A1 (en) * 1990-09-08 1992-03-19 Radex-Heraklith Industriebeteiligungs Aktiengesellschaft Scavenging port for passing gases and/or solids into a metallurgical melt, and a process for manufacturing the port

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU81208A1 (en) * 1979-04-25 1980-12-16 Arbed DEVICE FOR INJECTING GAS THROUGH THE BOTTOM INTO THE METAL BATH CONTAINED IN A REFINING CONTAINER
EP0043338A1 (en) * 1980-06-25 1982-01-06 Arbed S.A. Gas-permeable body of fire-resistant material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU82552A1 (en) * 1980-06-25 1982-01-20 Arbed FIRE-RESISTANT, GAS-PERMEABLE CONSTRUCTION

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU81208A1 (en) * 1979-04-25 1980-12-16 Arbed DEVICE FOR INJECTING GAS THROUGH THE BOTTOM INTO THE METAL BATH CONTAINED IN A REFINING CONTAINER
EP0043338A1 (en) * 1980-06-25 1982-01-06 Arbed S.A. Gas-permeable body of fire-resistant material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146079A2 (en) * 1983-12-12 1985-06-26 Arbed S.A. Gas-permeable refractory plug
EP0146079A3 (en) * 1983-12-12 1987-01-07 Arbed S.A. Gas-permeable refractory plug
WO1992004473A1 (en) * 1990-09-08 1992-03-19 Radex-Heraklith Industriebeteiligungs Aktiengesellschaft Scavenging port for passing gases and/or solids into a metallurgical melt, and a process for manufacturing the port

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Publication number Publication date
PT76732A (en) 1983-06-01
CA1229228A (en) 1987-11-17
ZA833627B (en) 1984-02-29
LU84167A1 (en) 1983-11-23
ES8404414A1 (en) 1984-04-16
JPH0744041U (en) 1995-10-24
AR229811A1 (en) 1983-11-30
BR8302619A (en) 1983-12-13
IN157467B (en) 1986-04-05
DE3367257D1 (en) 1986-12-04
MX158037A (en) 1988-12-28
KR840004787A (en) 1984-10-24
ES522666A0 (en) 1984-04-16
KR910009493B1 (en) 1991-11-19
ATE23196T1 (en) 1986-11-15
PT76732B (en) 1986-01-27
JPS58210113A (en) 1983-12-07
EP0095436B1 (en) 1986-10-29
AU557537B2 (en) 1986-12-24
AU1493183A (en) 1983-12-01

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