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EP1101825B1 - Refractory, ceramic gas flushing brick - Google Patents

Refractory, ceramic gas flushing brick Download PDF

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Publication number
EP1101825B1
EP1101825B1 EP00120224A EP00120224A EP1101825B1 EP 1101825 B1 EP1101825 B1 EP 1101825B1 EP 00120224 A EP00120224 A EP 00120224A EP 00120224 A EP00120224 A EP 00120224A EP 1101825 B1 EP1101825 B1 EP 1101825B1
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EP
European Patent Office
Prior art keywords
gas
ceramic body
ceramic
purging plug
gas purging
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.)
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EP00120224A
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German (de)
French (fr)
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EP1101825A1 (en
Inventor
Günter Kohlmayer
Klaus Gamweger
Leopold Kneis
Michael Heiligenbrunner
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Veitsch Radex GmbH and Co OG
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Veitsch Radex GmbH and Co OG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • 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

Definitions

  • the invention relates to a refractory ceramic Gas purging plug, as it has been in secondary metallurgy since long known.
  • Such gas purging plug are usually in the wall or in the bottom of the metallurgical treatment vessel and used here mostly by means of a perforated brick.
  • a Overview of different training forms of such Gas Pattersonsteine gives the Radex Rundschau 1987, 288th After Gas purifiers can be particularly in such with so-called directed porosity and those with structured so-called undirected porosity.
  • Goal of gas purging, for example in a steel ladle are in particular a fast temperature and Concentration of the steel bath and its Cleaning.
  • non-metallic inclusions should use the gas flow faster in the on the Molten bath of floating slag to be transported.
  • the Homogenization of the steel bath becomes a high Gas throughput required, dealing with gas purging, the have a directional porosity, the most economical reach. This can be the directional Porosity through gas channels with circular cross section or Gaskanäle reached with slit-shaped cross-section become.
  • the cleaning of the steel bath can be done by many small Achieve gas bubbles best at low pressure.
  • Here shows a gas purging plug with undirected porosity Advantages over a dishwasher with directional Porosity.
  • a dishwasher with undirected porosity points in the case molten metal infiltration has the disadvantage that he, if the melt is frozen, only conditionally can be put back into operation. In any case this requires a considerable gas pressure in the Result leads to that the infiltrated zone is blown off. This will reduce the wear of the Gas Kunststoffsteins increased dramatically.
  • the invention is based on the object, a offer generic gas purging, with the one good cleaning of the steel bath is possible, the one shows as little wear and a good Homogenization of the steel bath allows.
  • the basic idea of the invention is the above described advantages of a gas purging plug with undirected porosity with the advantages of a Gas purging plug to connect with directed porosity.
  • the invention is based on the knowledge, to form a gas purging plug so that it has sections with directed porosity the passage of gas under high pressure allows and over sections with undirected porosity the gas flow in many small Gas bubbles divides the cleaning of the steel bath promote.
  • the ceramic Body (with undirected porosity) be one-piece. at he will continue along at least a part of its peripheral surface (preferably over the entire height) with a burnable material and then circumferentially of a gas-tight ceramic material wrapped.
  • the gas-tight ceramic material of a consist of monolithic mass, for example, in an annulus between a mold and the ceramic Body is filled; but it is also possible the gas-tight ceramic material of a form prefabricated molding, which on the ceramic body is placed.
  • the burnable material for example, a Be film strips, for example, an adhesive tape or an adhesive film.
  • the at least one gas passage through at least one channel-like depression in at least one of the corresponding surface sections formed adjacent parts of the ceramic body become.
  • Such purging devices are known as Slit flush, although basically known, the individual parts of the ceramic body - outside the called slots - but of a gas-tight material exist, while according to the invention with undirected Porosity are formed.
  • the cross-sectional shape of the gas purging plug and / or the Ceramic body can be basically arbitrary. Out installation-technical reasons has been in the past Decades, however, a truncated cone shape for the Gas purging plug proved to be advantageous. Independently thereof, according to one embodiment of the ceramic Body have a rectangular cross-section.
  • the ceramic Body consists of at least two, for example, but also three or four "plates", where the said slot-like channels between each corresponding surface portions of adjacent parts be formed of the ceramic body.
  • the ceramic body in such a way that its cross-section, for example Rectangular cross section, reduced from its gas supply end to the gas outlet side end face of the gas purging plug.
  • spaced apart slot-shaped Channels in the interface area between the ceramic Body and the surrounding gas-tight material can also the entire peripheral surface of the ceramic body with occupied a burn-out, thin strip of material which burns out later (in case of fire) and so on a circumferential gas slot between the ceramic Body and the gas-tight material creates.
  • the ceramic body on a ceramic insert with unsupported or directed porosity, wherein the ceramic insert and the ceramic body a different cross-sectional geometry and / or a may have different cross-sectional area. ever According to embodiment, the ceramic body is on this Way through the interlocking gas-tight ceramic Material additionally held.
  • the ceramic body can be at least over two thirds of the total height of the gas sink.
  • the ceramic body may as well as the mentioned ceramic insert of any refractory Material exist, for example, a non-basic Dimensions.
  • the described gas flushing device has the following advantages: On the one hand, a high gas flow over the directed porosity (the gas channels, gas slots) is achieved; On the other hand, can be achieved on the undirected porosity of the ceramic body advantageous gas bubble formation.
  • Gas slots are usually either the undirected pores or the gas slots are not infiltrated, so that normally at least one Gas flushing section after a delay Interruption can be reactivated.
  • Washed over the slots after a break can infiltrations in the area of the ceramic body be slowly blown out, so that chipping (a Wear) either completely prevented or at least be reduced.
  • the density surrounding the porous ceramic body Mass for example, consist of a cast concrete can, at the same time prevents a leading Wear of an associated perforated stone inner surface into which the gas purging plug is used as it is like a sleeve protects the hole stone.
  • the reference numeral 10 of Figure 1 describes a Gas Jardinstein total. This consists of a ceramic body 12 with undirected porosity, the from an upper end face 10s of the gas purging plug 10 over about two thirds of the total height of the Gas Whysteins 10 extends down and thereby in the Cross-section enlarged. At the bottom of 12u is the ceramic body 12 on a ceramic insert 14 with undirected porosity up to the bottom End surface 10u of the gas purging plug 10 runs, the of a metal sheet 16 is covered, which has a central Opening 16o, in which a gas supply line 18th opens, which is welded to the bottom plate 16.
  • Both the ceramic body 12 and the ceramic Insert 14 are enveloped by a gas-tight material 20, which extends from the lower end 10u to the upper end face 10s of the gas purging plug 10 extends.
  • the ceramic body 12 with undirected porosity a square cross-section on.
  • the area of two opposite outer surfaces 12r, 121, ie in the interface area between the ceramic body 12 and the gas-tight material 20 is each formed about a 0.5 mm wide slot 22, which extends over the entire height of the ceramic body 12 extends.
  • FIG. 2 shows correspondingly that the gas purging plug 10 is next to an undirected porosity in the region of the body 12 with directed porosity (gas slots 22) in the Interface area between body 12 and gas-tight Material 20 is formed.
  • the ceramic body 12 of three sections 12.1, 12.2, 12.3, with their corresponding surfaces lie against each other and a total again have square cross-sectional area.
  • Parts 12.1 and 12.2 are along their surfaces to the adjacent parts 12.2, 12.3 each with slit-like Recesses 22 are formed, which together with the corresponding surfaces of the adjacent parts 12.2, 12.3 gas slots 22 in the sense of a directed Represent porosity.
  • FIG. 4 A slightly modified embodiment is shown in FIG. 4, according to which the ceramic body 12 consists of two parts 12.1, 12.2, according to the parts 12.1, 12.2 after Figure 3 are formed. That means, also run here between corresponding surface sections of the parts 12.1, 12.2 slot-shaped flushing channels 22.
  • ceramic insert 14 with undirected porosity has a truncated cone shape, that is a circular cross section, so that he as Resttownnan Attache can be used, as above shown.
  • the gas supply takes place in all embodiments via the gas supply line 18 through the ceramic insert 14th both about the undirected pores within the ceramic body 12 as well as over in or around the ceramic body 12 around extending slots 22 in a metallurgical melt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Incineration Of Waste (AREA)

Abstract

Refractory ceramic gas rinsing stone (10) comprises a ceramic body (12) with non-directive porosity extending from one gas inlet end (12u) to a gas outlet side front surface (10s) of the stone; and a gas-tight ceramic material (20) surrounding the ceramic body in the region of its periphery surface. A slit-like gas channel (22) is formed in the boundary surface between the ceramic body and the gas-tight ceramic material and/or within the ceramic body. The gas channel extends from a gas inlet end up to the a gas outlet side front surface of the stone. Preferred Features: The ceramic body is divided in the gas inlet direction. The gas channel is formed between corresponding surface sections of neighboring parts of the body.

Description

Die Erfindung betrifft einen feuerfesten keramischen Gasspülstein, wie er in der Sekundärmetallurgie seit langem bekannt ist.The invention relates to a refractory ceramic Gas purging plug, as it has been in secondary metallurgy since long known.

Derartige Gasspülsteine werden üblicherweise in der Wand oder im Boden des metallurgischen Behandlungsgefäßes und hier meist mittels eines Lochsteins eingesetzt. Eine Übersicht über verschiedene Ausbildungsformen derartiger Gasspülsteine gibt die Radex-Rundschau 1987, 288. Danach lassen sich Gasspüleinrichtungen insbesondere in solche mit sogenannter gerichteter Porosität und solche mit sogenannter ungerichteter Porosität gliedern.Such gas purging plug are usually in the wall or in the bottom of the metallurgical treatment vessel and used here mostly by means of a perforated brick. A Overview of different training forms of such Gasspülsteine gives the Radex Rundschau 1987, 288th After Gas purifiers can be particularly in such with so-called directed porosity and those with structured so-called undirected porosity.

Ziel des Gasspülens zum Beispiel in einer Stahlgießpfanne sind insbesondere ein schneller Temperatur- und Konzentrationsausgleich des Stahlbades und dessen Reinigung. Insbesondere nichtmetallische Einschlüsse sollen mit Hilfe des Gasstroms schneller in die auf dem Schmelzbad schwimmende Schlacke befördert werden. Für die Homogenisierung des Stahlbades wird ein hoher Gasdurchsatz gefordert, der sich mit Gasspülsteinen, die eine gerichtete Porosität aufweisen, am wirtschaftlichsten erreichen läßt. Dabei kann die gerichtete Porosität durch Gaskanäle mit Kreisquerschnitt oder Gaskanäle mit schlitzförmigem Querschnitt erreicht werden. Um eine Metallschmelzeinfiltration zu verhindern ist darauf zu achten, daß Gaskanäle mit Kreisquerschnitt einen Durchmesser von vorzugsweise < 1 mm und Gaskanäle mit Schlitzquerschnitt eine maximale Breite von ebenfalls vorzugsweise < 1 mm aufweisen. In diesem Fall ist die Länge der Gasschlitze von untergeordneter Bedeutung.Goal of gas purging, for example in a steel ladle are in particular a fast temperature and Concentration of the steel bath and its Cleaning. In particular non-metallic inclusions should use the gas flow faster in the on the Molten bath of floating slag to be transported. For the Homogenization of the steel bath becomes a high Gas throughput required, dealing with gas purging, the have a directional porosity, the most economical reach. This can be the directional Porosity through gas channels with circular cross section or Gaskanäle reached with slit-shaped cross-section become. To prevent molten metal infiltration Care must be taken to ensure that gas ducts with a circular cross-section a diameter of preferably <1 mm and gas channels with slot cross-section a maximum width of as well preferably <1 mm. In this case, the Length of the gas slots of secondary importance.

Die Reinigung des Stahlbades läßt sich durch viele kleine Gasblasen bei geringem Druck am besten erreichen. Hier zeigt ein Gasspülstein mit ungerichteter Porosität Vorteile gegenüber einem Spüler mit gerichteter Porosität.The cleaning of the steel bath can be done by many small Achieve gas bubbles best at low pressure. Here shows a gas purging plug with undirected porosity Advantages over a dishwasher with directional Porosity.

Ein Spüler mit ungerichteter Porosität weist im Fall einer Metallschmelzeinfiltration den Nachteil auf, daß er, sofern die Schmelze eingefroren ist, nur bedingt wieder in Betrieb genommen werden kann. In jedem Fall ist hierzu ein erheblicher Gasdruck notwendig, der im Ergebnis dazu führt, daß die infiltrierte Zone abgesprengt wird. Hierdurch wird der Verschleiß des Gasspülsteins drastisch erhöht.A dishwasher with undirected porosity points in the case molten metal infiltration has the disadvantage that he, if the melt is frozen, only conditionally can be put back into operation. In any case this requires a considerable gas pressure in the Result leads to that the infiltrated zone is blown off. This will reduce the wear of the Gasspülsteins increased dramatically.

Aus der EP 0577873 B1 ist ein Gasspülstein bekannt, der aus zwei unterschiedlichen, gasdichten Feuerfestmaterialien gebildet wird, wobei ein Abschnitt den anderen umgibt und in dem inneren Abschnitt Gaskanäle zur Durchleitung von Gas ausgebildet sind. Darüber hinaus wird in "Radex-Rundschau" 1987/Heft 1, Figur 4 die Ausbildung von Gasspülsteinen mit ungerichteter bzw. gerichteter Porosität dargestellt.From EP 0577873 B1 a gas purging plug is known which made of two different gas-tight refractory materials is formed, with a section the surrounds others and in the inner section gas channels to Passage of gas are formed. Furthermore is in "Radex Rundschau" 1987 / No. 1, Figure 4 the Formation of gas purging with undirected or directed porosity shown.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Gasspülstein anzubieten, mit dem eine gute Reinigung des Stahlbades möglich ist, der einen möglichst geringen Verschleiß zeigt und der eine gute Homogenisierung des Stahlbades ermöglicht.The invention is based on the object, a offer generic gas purging, with the one good cleaning of the steel bath is possible, the one shows as little wear and a good Homogenization of the steel bath allows.

Grundgedanke der Erfindung ist es, die vorstehend beschriebenen Vorteile eines Gasspülsteins mit ungerichteter Porosität mit den Vorteilen eines Gasspülsteines mit gerichteter Porosität zu verbinden. In diesem Sinne liegt der Erfindung die Erkenntnis zugrunde, einen Gasspülstein so auszubilden, daß er über Abschnitte mit gerichteter Porosität die Durchführung von Gas unter hohem Druck ermöglicht und über Abschnitte mit ungerichteter Porosität den Gasstrom in viele kleine Gasblasen aufteilt, die die Reinigung des Stahlbades fördern.The basic idea of the invention is the above described advantages of a gas purging plug with undirected porosity with the advantages of a Gas purging plug to connect with directed porosity. In In this sense, the invention is based on the knowledge, to form a gas purging plug so that it has sections with directed porosity the passage of gas under high pressure allows and over sections with undirected porosity the gas flow in many small Gas bubbles divides the cleaning of the steel bath promote.

Da die Kombination gerichteter und ungerichteter Porosität innerhalb eines Gasspülsteins jedoch herstellungstechnische Schwierigkeiten aufwirft schlägt die Erfindung konkret in ihrer allgemeinsten Ausführungsform einen modifizierten Aufbau vor, der durch folgende Merkmale gekennzeichnet ist:

  • mindestens einen keramischen Körper mit ungerichteter Porosität, der sich von einem gaszuführseitigen Ende bis zu einer gasauslaßseitigen Stirnfläche des Gasspülsteines erstreckt,
  • ein gasdichtes keramisches Material, welches den keramischen Körper mindestens im Bereich seiner Umfangsfläche umgibt, wobei
  • im Grenzflächenbereich zwischen dem keramischen Körper und dem gasdichten keramischen Material und/oder innerhalb des keramischen Körpers mindestens ein Gaskanal ausgebildet ist, der sich von einem gaszuführseitigen Ende bis zu der gasauslaßseitigen Stirnfläche des Gasspülsteines erstreckt.
However, since the combination of directional and undirected porosity within a gas purging plug poses manufacturing difficulties, the invention in its most specific embodiment concretely proposes a modified structure characterized by the following features:
  • at least one ceramic body having undirected porosity extending from a gas supply side end to a gas outlet side end surface of the gas purging plug,
  • a gas-tight ceramic material which surrounds the ceramic body at least in the region of its peripheral surface, wherein
  • at least one gas channel is formed in the interface region between the ceramic body and the gas-tight ceramic material and / or within the ceramic body, which extends from a gas supply-side end to the gas outlet side end face of the gas purging plug.

Bei der erstgenannten Ausführungsform kann der keramische Körper (mit ungerichteter Porosität) einteilig sein. Bei der weiteren Konfektionierung wird er entlang mindestens eines Teils seiner Umfangsfläche (vorzugsweise über die gesamte Höhe) mit einem ausbrennbaren Material belegt und anschließend umfangsseitig von einem gasdichten keramischen Material umhüllt.In the former embodiment, the ceramic Body (with undirected porosity) be one-piece. at he will continue along at least a part of its peripheral surface (preferably over the entire height) with a burnable material and then circumferentially of a gas-tight ceramic material wrapped.

Dabei kann das gasdichte keramische Material aus einer monolithischen Masse bestehen, die beispielsweise in einen Ringraum zwischen einer Form und dem keramischen Körper eingefüllt wird; ebenso ist es aber auch möglich, das gasdichte keramische Material aus einem vorkonfektionierten Formteil auszubilden, welches auf den keramischen Körper aufgesetzt wird.In this case, the gas-tight ceramic material of a consist of monolithic mass, for example, in an annulus between a mold and the ceramic Body is filled; but it is also possible the gas-tight ceramic material of a form prefabricated molding, which on the ceramic body is placed.

Das ausbrennbare Material kann beispielsweise ein Folienstreifen sein, beispielsweise ein Klebeband oder eine Klebefolie.The burnable material, for example, a Be film strips, for example, an adhesive tape or an adhesive film.

Beim späteren Brand des Gasspülsteins brennt dieser Teil aus und schafft einen schlitzförmigen Gaskanal (also eine gerichtete Porosität) im Grenzflächenbereich zwischen dem keramischen Körper und dem umgebenden gasdichten Material.In the later fire of the gas flushing stone burns this part and creates a slit-shaped gas channel (ie a directed porosity) in the interface area between the ceramic body and the surrounding gas-tight Material.

Es ist selbstverständlich, daß mehrere derartiger ausbrennbarer Streifen beabstandet zueinander im Grenzflächenbereich zwischen dem keramischen Körper und dem gasdichten keramischen Material angeordnet werden können. In jedem Fall muß die Anbringung so erfolgen, daß die Streifen im Bereich der gasauslaßseitigen Stirnfläche des Gasspülsteins enden, um eine Gaszufuhr in eine Metallschmelze zu ermöglichen. Andererseits muß das andere Ende so ausgebildet sein, daß es mit Gas beaufschlagt werden kann.It is obvious that several such burnable strip spaced from each other in Interface area between the ceramic body and the gas-tight ceramic material can be arranged can. In any case, the attachment must be made so that the strips in the area of the gas outlet side End of the gas purging end to a gas supply in to allow a molten metal. On the other hand, that must other end be designed so that it is gas can be applied.

In der nachfolgenden Beschreibung wird hierzu ein Beispiel angegeben.In the following description becomes this one Example given.

Bei der zweiten Ausführungsform wird der keramische Körper in Gaszuführrichtung geteilt ausgebildet und der mindestens eine Gaskanal zwischen korrespondierenden Flächenabschnitten benachbarter Teile des keramischen Körpers ausgebildet.In the second embodiment, the ceramic Body formed in Gaszuführrichtung divided and the at least one gas channel between corresponding ones Surface portions of adjacent parts of the ceramic Body trained.

Zu diesem Zweck kann der mindestens eine Gaskanal durch mindestens eine kanalartige Vertiefung in mindestens einem der korrespondierenden Flächenabschnitte benachbarter Teile des keramischen Körpers ausgebildet werden. Derartige Spüleinrichtungen sind als sogenannte Schlitzspüler zwar grundsätzlich bekannt, wobei die einzelnen Teile des keramischen Körpers - außerhalb der genannten Schlitze - jedoch aus einem gasdichten Material bestehen, während sie erfindungsgemäß mit ungerichteter Porosität ausgebildet sind.For this purpose, the at least one gas passage through at least one channel-like depression in at least one of the corresponding surface sections formed adjacent parts of the ceramic body become. Such purging devices are known as Slit flush, although basically known, the individual parts of the ceramic body - outside the called slots - but of a gas-tight material exist, while according to the invention with undirected Porosity are formed.

Die Querschnittsform des Gasspülsteins und/oder des keramischen Körpers kann grundsätzlich beliebig sein. Aus einbautechnischen Gründen hat sich in den vergangenen Jahrzehnten jedoch eine Kegelstumpfform für den Gasspülstein als vorteilhaft herausgestellt. Unabhängig davon kann nach einer Ausführungsform der keramische Körper einen Rechteckquerschnitt aufweisen.The cross-sectional shape of the gas purging plug and / or the Ceramic body can be basically arbitrary. Out installation-technical reasons has been in the past Decades, however, a truncated cone shape for the Gas purging plug proved to be advantageous. Independently thereof, according to one embodiment of the ceramic Body have a rectangular cross-section.

Bei einer geteilten Ausführungsform des keramischen Körpers besteht dieser entsprechend aus mindestens zwei, beispielsweise aber auch drei oder vier "Platten", wobei die genannten schlitzartigen Kanäle jeweils zwischen korrespondierenden Flächenabschnitten benachbarter Teile des keramischen Körpers ausgebildet werden.In a divided embodiment of the ceramic Body consists of at least two, for example, but also three or four "plates", where the said slot-like channels between each corresponding surface portions of adjacent parts be formed of the ceramic body.

Um den keramischen Körper sicher in seiner gasdichten Umhüllung zu halten sieht eine weitere Ausführungsform der Erfindung vor, den keramischen Körper so auszubilden, daß sich sein Querschnitt, beispielsweise
Rechteckquerschnitt, von seinem gaszuführseitigen Ende zur gasauslaßseitigen Stirnfläche des Gasspülsteins verringert.In order to keep the ceramic body safely in its gas-tight enclosure provides a further embodiment of the invention, the ceramic body in such a way that its cross-section, for example
Rectangular cross section, reduced from its gas supply end to the gas outlet side end face of the gas purging plug.

Neben der genannten Ausbildung eines oder mehrerer, beabstandet zueinander angeordneter schlitzförmiger Kanäle im Grenzflächenbereich zwischen dem keramischen Körper und dem umgebenden gasdichten Material kann auch die gesamte Umfangsfläche des keramischen Körpers mit einem ausbrennbaren, dünnen Materialstreifen belegt werden, welcher später (beim Brand) ausbrennt und so einen umlaufenden Gasschlitz zwischen dem keramischen Körper und dem gasdichten Material schafft.In addition to the mentioned training of one or more, spaced apart slot-shaped Channels in the interface area between the ceramic Body and the surrounding gas-tight material can also the entire peripheral surface of the ceramic body with occupied a burn-out, thin strip of material which burns out later (in case of fire) and so on a circumferential gas slot between the ceramic Body and the gas-tight material creates.

Bei einer zum gasaustrittsseitigen Ende verjüngenden Querschnittsfläche des keramischen Körpers wird dieser auch bei letztgenannter Ausführungsform sicher in der gasdichten Umhüllung gehalten.At a tapered to the gas outlet end Cross-sectional area of the ceramic body becomes this Also in the latter embodiment safely in the kept gas-tight envelope.

Eine Ergänzung dieser Ausführungsform sieht vor, den keramischen Körper auf einem keramischen Einsatz mit ungerichteter oder gerichteter Porosität aufzulegen, wobei der keramische Einsatz und der keramische Körper eine unterschiedliche Querschnittgeometrie und/oder eine unterschiedliche Querschnittsfläche aufweisen können. Je nach Ausführungsform wird der keramische Körper auf diese Weise durch das ihn untergreifende gasdichte keramische Material zusätzlich gehalten.An addition to this embodiment provides, the ceramic body on a ceramic insert with unsupported or directed porosity, wherein the ceramic insert and the ceramic body a different cross-sectional geometry and / or a may have different cross-sectional area. ever According to embodiment, the ceramic body is on this Way through the interlocking gas-tight ceramic Material additionally held.

Bei dem zuvor genannten Ausführungsbeispiel mit einem keramischen Einsatz unterhalb des keramischen Körpers ergibt sich der zusätzliche Vorteil einer Reststärkenanzeige des Gasspülsteins. Ist der keramische Körper nämlich bis in den Bereich des Einsatzes verschlissen so läßt sich dies aufgrund der unterschiedlichen Geometrie oder unterschiedlichen Querschnittsfläche des dann ausschließlich gasspülenden Einsatzes optisch erkennen.In the aforementioned embodiment with a ceramic insert below the ceramic body there is the additional benefit of a Residual strength indicator of the gas purging plug. Is the ceramic Body namely into the area of the insert this can be worn out due to the different geometry or different Cross-sectional area of the then exclusively gasspülenden Visually recognize the insert.

Dabei kann der keramische Körper sich über mindestens zwei Drittel der Gesamthöhe des Gasspülsteins erstrecken.In this case, the ceramic body can be at least over two thirds of the total height of the gas sink.

Der keramische Körper kann ebenso wie der genannte keramische Einsatz aus einem beliebigen feuerfesten Werkstoff bestehen, beispielsweise einer nicht basischen Masse.The ceramic body may as well as the mentioned ceramic insert of any refractory Material exist, for example, a non-basic Dimensions.

Die beschriebene Gasspüleinrichtung weist folgende Vorteile auf:
Einerseits wird ein hoher Gasdurchfluß über die gerichtete Porosität (die Gaskanäle, Gasschlitze) erreicht; andererseits läßt sich über die ungerichtete Porosität des keramischen Körpers eine vorteilhafte Gasblasenausbildung erreichen.The described gas flushing device has the following advantages:
On the one hand, a high gas flow over the directed porosity (the gas channels, gas slots) is achieved; On the other hand, can be achieved on the undirected porosity of the ceramic body advantageous gas bubble formation.

Dadurch, daß die den porösen Körper und gegebenenfalls den Einsatz umgebende gasdichte Umhüllung eine Stützwirkung auf den porösen Körper/Einsatz ausübt wird der Verschleiß insbesondere des porösen Körpers auch dann klein sein, wenn es zu einer Metallschmelzeinfiltration kommen sollte, die über erhöhten Gasdruck (wie oben beschrieben) abgesprengt werden muß. Characterized in that the porous body and optionally the use surrounding gas-tight enclosure a Supporting effect on the porous body / use is exercised the wear of the porous body even then be small when there is a molten metal infiltration should come about the increased gas pressure (as above described) must be blasted off.

Aufgrund unterschiedlicher Infiltrationsneigung des keramischen Körpers mit ungerichteter Porosität und den innerhalb des keramischen Körpers und/oder im Grenzbereich zum Umhüllungsmaterial ausgebildeten Gasschlitzen werden in der Regel entweder die ungerichteten Poren oder die Gasschlitze nicht infiltriert, so daß im Normalfall mindestens ein Gasspülabschnitt verzögerungsfrei nach einer Unterbrechung wieder aktiviert werden kann.Due to different infiltration tendency of the ceramic body with undirected porosity and the within the ceramic body and / or in the Boundary formed to the wrapping material Gas slots are usually either the undirected pores or the gas slots are not infiltrated, so that normally at least one Gas flushing section after a delay Interruption can be reactivated.

Wird nach einer Unterbrechung über die Schlitze angespült können Infiltrationen im Bereich des keramischen Körpers langsam freigeblasen werden, so daß Abplatzungen (ein Verschleiß) entweder ganz verhindert oder zumindest verringert werden.Washed over the slots after a break can infiltrations in the area of the ceramic body be slowly blown out, so that chipping (a Wear) either completely prevented or at least be reduced.

Die den porösen keramischen Körper umhüllende dichte Masse, die beispielsweise aus einem Feuerbeton bestehen kann, verhindert gleichzeitig einen voreilenden Verschleiß einer zugehörigen Lochsteininnenfläche, in die der Gasspülstein eingesetzt wird, da sie wie eine Hülse den Lochstein schützt.The density surrounding the porous ceramic body Mass, for example, consist of a cast concrete can, at the same time prevents a leading Wear of an associated perforated stone inner surface into which the gas purging plug is used as it is like a sleeve protects the hole stone.

Weitere Merkmale der Erfindung ergeben sich aus den Merkmalen der Unteransprüche sowie den sonstigen Anmeldungsunterlagen. Further features of the invention will become apparent from the Characteristics of the dependent claims and other Application documents.

Die Erfindung wird nachstehend anhand verschiedener Ausführungsbeispiele näher erläutert. Dabei zeigen - jeweils in schematisierter Darstellung -

Figur 1:
einen Längsschnitt durch einen erfindungsgemäßen Gasspülstein.
Figur 2:
einen Horizontalschnitt entlang der Ebene 2-2 gemäß Figur 1.
Figur 3:
einen Horizontalschnitt entlang der Ebene 2-2 nach Figur 1 für eine weitere Ausführungsform.
Figur 4:
einen Horizontalschnitt entlang der Ebene 2-2 nach Figur 1 für eine dritte Ausführungsform.
The invention will be explained in more detail below with reference to various embodiments. Show - in a schematic representation -
FIG. 1:
a longitudinal section through a gas purging plug according to the invention.
FIG. 2:
a horizontal section along the plane 2-2 of Figure 1.
FIG. 3:
a horizontal section along the plane 2-2 of Figure 1 for a further embodiment.
FIG. 4:
a horizontal section along the plane 2-2 of Figure 1 for a third embodiment.

In den Figuren sind gleiche oder gleichwirkende Bauteile mit gleichen Bezugsziffern dargestellt.In the figures are the same or equivalent components represented by the same reference numerals.

Das Bezugszeichen 10 nach Figur 1 beschreibt einen Gasspülstein insgesamt. Dieser besteht aus einem keramischen Körper 12 mit ungerichteter Porosität, der sich von einer oberen Stirnfläche 10s des Gasspülsteins 10 über etwa zwei Drittel der Gesamthöhe des Gasspülsteins 10 nach unten erstreckt und sich dabei im Querschnitt vergrößert. Am unteren Ende 12u liegt der keramische Körper 12 auf einem keramischen Einsatz 14 mit ungerichteter Porosität auf, der bis zur unteren Stirnfläche 10u des Gasspülsteins 10 verläuft, die von einem Metallblech 16 abgedeckt wird, welches eine mittige Öffnung 16o aufweist, in die eine Gaszuführleitung 18 einmündet, welche am Bodenblech 16 angeschweißt ist.The reference numeral 10 of Figure 1 describes a Gasspülstein total. This consists of a ceramic body 12 with undirected porosity, the from an upper end face 10s of the gas purging plug 10 over about two thirds of the total height of the Gasspülsteins 10 extends down and thereby in the Cross-section enlarged. At the bottom of 12u is the ceramic body 12 on a ceramic insert 14 with undirected porosity up to the bottom End surface 10u of the gas purging plug 10 runs, the of a metal sheet 16 is covered, which has a central Opening 16o, in which a gas supply line 18th opens, which is welded to the bottom plate 16.

Sowohl der keramische Körper 12 als auch der keramische Einsatz 14 sind von einem gasdichten Material 20 umhüllt, welches sich vom unteren Ende 10u zur oberen Stirnfläche 10s des Gasspülsteins 10 erstreckt.Both the ceramic body 12 and the ceramic Insert 14 are enveloped by a gas-tight material 20, which extends from the lower end 10u to the upper end face 10s of the gas purging plug 10 extends.

Über die Gaszuführleitung 18 zugeführtes Gas durchströmt den Gasspülstein 10 über den porösen Einsatz 14 und den keramischen Körper 12, wie nachstehend beschrieben.Gas flows through the gas supply line 18 the gas purging plug 10 on the porous insert 14 and the ceramic body 12 as described below.

Gemäß Figur 2 weist der keramische Körper 12 mit ungerichteter Porosität einen quadratischen Querschnitt auf. Im Bereich zweier gegenüberliegender Außenflächen 12r, 121, also im Grenzflächenbereich zwischen dem keramischen Körper 12 und dem gasdichten Material 20 ist jeweils ein circa 0,5 mm breiter Schlitz 22 ausgebildet, der sich über die gesamte Höhe des keramischen Körpers 12 erstreckt.According to Figure 2, the ceramic body 12 with undirected porosity a square cross-section on. In the area of two opposite outer surfaces 12r, 121, ie in the interface area between the ceramic body 12 and the gas-tight material 20 is each formed about a 0.5 mm wide slot 22, which extends over the entire height of the ceramic body 12 extends.

Zur Ausbildung der Schlitze 22 wurden bei der Herstellung des Gasspülsteins 10 auf die Außenflächen 12r, 121 des keramischen Körpers 12 Klebestreifen aufgeklebt, die anschließend mit dem gasdichten keramischen Material 20 übergossen wurden. Bei der anschließenden Temperaturbehandlung des Gasspülsteins wurden die Klebebänder unter Ausbildung der genannten Schlitze 22 ausgebrannt.To form the slots 22 were in the production of the gas purging plug 10 on the outer surfaces 12r, 121 of the Ceramic body glued on 12 adhesive strips, the subsequently with the gas-tight ceramic material 20 were poured over. In the subsequent Temperature treatment of the gas sink were the Adhesive tapes forming said slots 22 burned out.

Figur 2 zeigt entsprechend, daß der Gasspülstein 10 neben einer ungerichteten Porosität im Bereich des Körpers 12 mit gerichteter Porosität (Gasschlitzen 22) im Grenzflächenbereich zwischen Körper 12 und gasdichtem Material 20 ausgebildet ist.FIG. 2 shows correspondingly that the gas purging plug 10 is next to an undirected porosity in the region of the body 12 with directed porosity (gas slots 22) in the Interface area between body 12 and gas-tight Material 20 is formed.

Beim Ausführungsbeispiel nach Figur 3 besteht der keramische Körper 12 aus drei Abschnitten 12.1, 12.2, 12.3, die mit ihren korrespondierenden Flächen gegeneinander liegen und insgesamt wieder eine quadratische Querschnittsfläche aufweisen. Die Teile 12.1 und 12.2 sind entlang ihrer Oberflächen zu den benachbarten Teilen 12.2, 12.3 jeweils mit schlitzartigen Ausnehmungen 22 ausgebildet, die zusammen mit den korrespondierenden Oberflächen der benachbarten Teile 12.2, 12.3 Gasschlitze 22 im Sinne einer gerichteten Porosität darstellen.In the embodiment of Figure 3, the ceramic body 12 of three sections 12.1, 12.2, 12.3, with their corresponding surfaces lie against each other and a total again have square cross-sectional area. Parts 12.1 and 12.2 are along their surfaces to the adjacent parts 12.2, 12.3 each with slit-like Recesses 22 are formed, which together with the corresponding surfaces of the adjacent parts 12.2, 12.3 gas slots 22 in the sense of a directed Represent porosity.

Im Grenzflächenbereich sämtlicher Oberflächenabschnitte 12h, 12t, 121, 12r des keramischen Körpers 12 zum umgebenden gasdichten Material 20 sind wiederum (zusätzliche) schlitzförmige Kanäle 22 ausgebildet, die sich im Gegensatz zum Ausführungsbeispiel nach Figur 2 jedoch nicht über die gesamte Breite der jeweiligen Oberfläche 12h, 12t, 12l, 12r erstrecken, sondern nur über einen Teilbereich. Die Herstellung dieser Schlitze 22 kann analog dem Ausführungsbeispiel nach Figur 2 erfolgen.In the interface area of all surface sections 12h, 12t, 121, 12r of the ceramic body 12 for surrounding gas-tight material 20 are in turn (additional) slit-shaped channels 22 are formed, the in contrast to the embodiment of Figure 2 however, not across the entire width of each Surface 12h, 12t, 12l, 12r extend, but only over a subarea. The production of these slots 22 can analogously to the embodiment of Figure 2 respectively.

Eine leicht modifizierte Ausführungsform zeigt Figur 4, wonach der keramische Körper 12 aus zwei Teilen 12.1, 12.2 besteht, die entsprechend den Teilen 12.1, 12.2 nach Figur 3 ausgebildet sind. Das heißt, auch hier verlaufen zwischen korrespondierenden Flächenabschnitten der Teile 12.1, 12.2 schlitzförmige Spülkanäle 22.A slightly modified embodiment is shown in FIG. 4, according to which the ceramic body 12 consists of two parts 12.1, 12.2, according to the parts 12.1, 12.2 after Figure 3 are formed. That means, also run here between corresponding surface sections of the parts 12.1, 12.2 slot-shaped flushing channels 22.

Zusätzlich sind - analog Figur 3 - entlang der äußeren Flächenabschnitte 12h, 12t des Körpers 12 weitere Spülkanäle 22 zu erkennen. Auf den verbleibenden Oberflächenabschnitten 12l, 12r des Körpers 12 verlaufen ebenfalls schlitzförmige Spülkanäle 22, die sich jedoch - analog Figur 2 - über die gesamte Breite des Flächenabschnittes 12l beziehungsweise 12r erstrecken.In addition are - analogous to Figure 3 - along the outer Surface portions 12h, 12t of the body 12 more Recognize flushing channels 22. On the remaining Surface portions 12l, 12r of the body 12 extend also slot-shaped flushing channels 22, which, however, analogous to Figure 2 - over the entire width of Surface portion 12l and 12r extend.

Der in Figur 1 dargestellte keramische Einsatz 14 mit ungerichteter Porosität weist eine Kegelstumpfform auf, das heißt einen kreisförmigen Querschnitt, so daß er als Reststärkenanzeige benutzt werden kann, wie vorstehend dargestellt. The illustrated in Figure 1 ceramic insert 14 with undirected porosity has a truncated cone shape, that is a circular cross section, so that he as Reststärkenanzeige can be used, as above shown.

Die Gaszufuhr erfolgt bei allen Ausführungsformen über die Gaszuführleitung 18 durch den keramischen Einsatz 14 sowohl über die ungerichteten Poren innerhalb des keramischen Körpers 12 als auch über die in beziehungsweise um den keramischen Körper 12 herum verlaufenden Schlitze 22 in eine metallurgische Schmelze.The gas supply takes place in all embodiments via the gas supply line 18 through the ceramic insert 14th both about the undirected pores within the ceramic body 12 as well as over in or around the ceramic body 12 around extending slots 22 in a metallurgical melt.

Bei voller Gaslast kann es zu einer Abkühlung und leichten Schrumpfung des benachbarten Feuerfestmaterials kommen, was den positiven Nebeneffekt einer geringen Schlitzvergrößerung hat, der bei verringertem Gasdruck beziehungsweise Unterbrechung der Gaszufuhr (und paralleler Erwärmung des Feuerfestmaterials) wieder aufgehoben wird. Somit ergeben sich aus vorbeschriebenem Effekt keine Nachteile hinsichtlich der Infiltrationsgefahr, im Gegenteil: diese wird zusätzlich verringert.At full gas load it can cause a cooling and slight shrinkage of the adjacent refractory material come, what the positive side effect of a low Slot enlargement has that at reduced gas pressure or interruption of the gas supply (and parallel heating of the refractory material) again will be annulled. Thus result from the above Effect no disadvantages with regard to the risk of infiltration, on the contrary: this is additionally reduced.

Claims (11)

  1. A refractory ceramic gas purging plug (1) having the following features:
    1.1 at least one ceramic body (12) of non-oriented porosity, which extends from an end (12u) on the gas feed side of the gas purging plug (10) to an end face (10s) on the gas outlet side thereof,
    1.2 a gas-tight ceramic material (20), which surrounds the ceramic body (12) at least in the area of its circumferential surface (12l, 12r, 12h, 12t), wherein
    1.3 at least one slit-shaped gas channel (22) is formed in the boundary surface area between the ceramic body (12) and the gas-tight ceramic material (20) and/or within the ceramic body (12), which gas channel (22) extends from an end (12u) on the gas feed side of the gas purging plug (10) to the end face (10s) on the gas outlet side thereof.
  2. A gas purging plug according to claim 1, in which the ceramic body (12) is of divided construction in the gas feed direction and the at least one gas channel (22) is constructed between corresponding surface portions of adjacent parts (12.1, 12.2, 12.3) of the ceramic body (12).
  3. A gas purging plug according to claim 2, in which the at least one gas channel (22) takes the form of at least one channel-like recess in at least one of the corresponding surface portions of adjacent parts (12.1, 12.2, 12.3) of the ceramic body (12).
  4. A gas purging plug according to claim 1, in which the ceramic body (12) is of rectangular cross-section.
  5. A gas purging plug according to claim 1, in which the rectangular cross-sections of the ceramic body decrease from its end (12u) on the gas feed side of the gas purging plug (10) to the end face (10s) on the gas outlet side thereof.
  6. A gas purging plug according to claim 1, in which the gas channel (22) extending in the boundary surface area between the ceramic body (12) and the gas-tight material (20) extends around the entire ceramic body (12).
  7. A gas purging plug according to claim 1, in which the ceramic body (12) lies on a ceramic insert (14) of non-oriented or oriented porosity, wherein the ceramic insert (14) and the ceramic body (12) exhibit different cross-sectional geometries.
  8. A gas purging plug according to claim 7, in which the ceramic insert (14) and the ceramic body (12) exhibit different cross-sectional areas.
  9. A gas purging plug according to claim 1, in which the gas-tight ceramic material (20) is a cast or pressed material.
  10. A gas purging plug according to claim 1, in which the gas-tight ceramic material (20) takes the form of a moulded component.
  11. A gas purging plug according to claim 1, in which the ceramic body (12) extends over at least two thirds of the total height of the gas purging plug (10).
EP00120224A 1999-11-16 2000-09-26 Refractory, ceramic gas flushing brick Expired - Lifetime EP1101825B1 (en)

Applications Claiming Priority (2)

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DE19954918 1999-11-16
DE19954918A DE19954918C2 (en) 1999-11-16 1999-11-16 Refractory ceramic gas purging plug

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EP1101825A1 EP1101825A1 (en) 2001-05-23
EP1101825B1 true EP1101825B1 (en) 2003-07-16

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AT (1) ATE245202T1 (en)
DE (2) DE19954918C2 (en)
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US7276205B2 (en) 2002-06-07 2007-10-02 Vesuvius Crucible Company Injection device and process for the injection of a fluid
WO2022075961A1 (en) * 2020-10-05 2022-04-14 Limited Liability Company "Innotech-Splav" A method for treating a liquid metal with a gas medium in a metallurgic container and a device for performing the same

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DE10305232B3 (en) * 2003-02-08 2004-08-05 Refractory Intellectual Property Gmbh & Co.Kg Refractory ceramic gas purging plug
EP2111938B1 (en) 2008-04-24 2017-04-19 Calderys France Purging plug for blowing gas into a metal treatment recipient
DE102008029934B3 (en) * 2008-06-26 2009-06-10 Refractory Intellectual Property Gmbh & Co. Kg Fireproof ceramic gas purging plug
EP2893992B1 (en) * 2014-01-09 2015-12-30 Refractory Intellectual Property GmbH & Co. KG Gas flushing element and associated gas connection element
DE102014015325A1 (en) * 2014-10-17 2016-04-21 Pa-Ha-Ge Feuerfeste Erzeugnisse Gmbh & Co. Kg Dishwasher with stacked inserts
KR101819913B1 (en) 2016-09-19 2018-01-18 한국내화 주식회사 Porous plug
UA126933C2 (en) 2018-01-29 2023-02-22 Рефракторі Інтеллектуал Проперті Гмбх Енд Ко. Кг Gas purging plug, gas purging system, method for characterization of a gas purging plug and method for purging a metal melt
CA3265365A1 (en) 2022-10-27 2024-05-02 Refractory Intellectual Property Gmbh & Co. Kg Refractory gas purging plug and method for controlling the conduction of gas to a refractory gas purging plug
WO2024089095A1 (en) 2022-10-27 2024-05-02 Refractory Intellectual Property Gmbh & Co. Kg Refractory gas purging plug
EP4608997A1 (en) 2022-10-27 2025-09-03 Refractory Intellectual Property GmbH & Co. KG Refractory gas purging plug and a method for the production of a refractory gas purging plug

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US7276205B2 (en) 2002-06-07 2007-10-02 Vesuvius Crucible Company Injection device and process for the injection of a fluid
WO2022075961A1 (en) * 2020-10-05 2022-04-14 Limited Liability Company "Innotech-Splav" A method for treating a liquid metal with a gas medium in a metallurgic container and a device for performing the same

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DE50002898D1 (en) 2003-08-21
ATE245202T1 (en) 2003-08-15
DE50002898C5 (en) 2008-11-06
DE19954918A1 (en) 2001-05-31
DE19954918C2 (en) 2001-09-20
ES2201981T3 (en) 2004-04-01
EP1101825A1 (en) 2001-05-23

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