EP0043160B2 - Casting equipment for fused masses - Google Patents

Casting equipment for fused masses Download PDF

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Publication number
EP0043160B2
EP0043160B2 EP19810200701 EP81200701A EP0043160B2 EP 0043160 B2 EP0043160 B2 EP 0043160B2 EP 19810200701 EP19810200701 EP 19810200701 EP 81200701 A EP81200701 A EP 81200701A EP 0043160 B2 EP0043160 B2 EP 0043160B2
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EP
European Patent Office
Prior art keywords
weight
refractory concrete
alumina
binder
degradable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19810200701
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German (de)
French (fr)
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EP0043160A1 (en
EP0043160B1 (en
Inventor
Henri Jacobs
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
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Priority claimed from BE5/5215A external-priority patent/BE884080A/en
Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Priority to AT81200701T priority Critical patent/ATE11382T1/en
Publication of EP0043160A1 publication Critical patent/EP0043160A1/en
Application granted granted Critical
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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
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
    • 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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor
    • B22D41/30—Manufacturing or repairing thereof
    • B22D41/32—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • the present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel.
  • pouring devices equipping in particular the steelworks pouring ladles, emptying from the bottom. These devices allow the complete flow of the steel contained in the pocket.
  • the pouring equipment for these pockets can take various forms. It can in particular be of the conventional cattail type or of the sliding plate type.
  • the casting equipment for a steelworks pocket consists of at least one internal nozzle, one external nozzle and a system, located between the two nozzles. , to adjust or interrupt the flow of molten material.
  • the internal nozzle sometimes called the collecting nozzle, is inserted into a seat brick, which is part of the casting equipment, and is itself housed in the refractory lining of the bag.
  • the external nozzle which is sometimes called a regulating nozzle, is located under the pocket in the extension of the collecting nozzle; it is used in particular to calibrate and center the casting jet.
  • a system of flat or cylindrical sliding plates Between the two nozzles is disposed a system of flat or cylindrical sliding plates, ensuring the adjustment of the flow rate of the molten material, in particular the speed of casting.
  • the various constituent elements of the casting equipment are provided with a mold, for example a metal casing, which ensures correct shaping of the refractory materials required for their manufacture and which gives them a certain resistance to stresses. mechanical.
  • baked refractory materials have often been used for the manufacture of the constituent elements of casting equipment, the cost of which was obviously conditioned by their quality.
  • the nozzles are subjected, during the casting of molten metal, to severe erosion, so that their lifetime is extremely short and rarely exceeds a casting operation.
  • the section of the flow channel becomes irregular, the jet of molten metal is disturbed and pouring is difficult. It is therefore necessary to replace the nozzles often, which leads to disassembly and reassembly costs, to which is added the price of the equipment itself.
  • DE-C 1 250 607 describes a pouring nozzle according to the preamble of claim 1 which ensures a substantially constant flow rate, despite the decrease in the static pressure of the molten steel contained in the ladle, at as this pocket becomes empty.
  • This nozzle contains several parts made of differently degradable materials, the part located towards the outlet being the least degradable while the part located near the ladle is the most degradable. Building a nozzle with several parts is complicated. To avoid this drawback, the present invention provides a simpler construction nozzle which nevertheless keeps the substantially constant flow rate of the known nozzle (DE-C 1250607)
  • the present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel, this nozzle comprising at least one part of an uncooked and uncompressed refractory concrete, consisting (1) of an aggregate or aggregate of particles containing more than 99% by weight of alumina having undergone a prior heat treatment up to the melting or sintering temperature and (2) of a binder formed from approximately 75 to 85% by weight of alumina, the remainder of the binder being essentially calcium oxide, this binder having undergone a prior heat treatment up to the melting temperature, said refractory concrete part being covered with a layer of degradable refractory concrete capable of undergoing progressive erosion due to the contact of the molten materials during their casting, so that this casting takes place at a substantially constant flow rate.
  • the degradable concrete layer of the nozzle according to the present invention advantageously consists of a refractory concrete of the silico-aluminous type having an alumina content of approximately 45 to 65%, preferably approximately 47 to 50% by weight.
  • degradable concrete a refractory concrete containing about 55 to 60% by weight of alumina and titanium dioxide.
  • the iron oxide (Fe 2 0 3 ) content of these degradable concretes may not exceed 0.6%.
  • the aggregate of degradable refractory concrete advantageously has an alumina content of approximately 45 to 65% by weight, the rest being mainly composed of silica.
  • the binder with hydraulic setting of this concrete it is of the silico-aluminous type containing approximately 25 to 40% by weight of calcium oxide.
  • the degradable refractory concrete parts can be molded in situ in refractory concrete nozzles with a very high alumina content.
  • the Applicant has found that the layer of degradable refractory concrete adheres perfectly to the part of the very high grade nozzle in alumina which surrounds it and that this part undergoes homogeneous wear on its contact surface with the molten metal.
  • composition of neutral refractory concrete Composition of neutral refractory concrete:
  • the mixture of aggregate and binder in the above-mentioned proportions is added with a dispersing and stabilizing agent consisting of sodium pyrophosphate or sodium carbonate in an amount of approximately 0.2% relative to the binder.
  • a dispersing and stabilizing agent consisting of sodium pyrophosphate or sodium carbonate in an amount of approximately 0.2% relative to the binder.
  • Refractory concrete parts are obtained by spoiling the mixture of aggregate and refractory binder with a minimum amount of water in a mold. Before the hydraulic setting of the binder, the mixture is packed, compacted or vibrated.
  • composition of degradable refractory concrete Composition of degradable refractory concrete:
  • the mixture of aggregate and binder mixed with a minimum of water is molded in situ in the interior part of a nozzle made of refractory concrete of the type described in Example 1.
  • the Applicant has found that by using refractory concrete nozzles, according to Example 1, internally lined with a layer of degradable refractory concrete according to Example 2, there is no breakthrough or cracking of the nozzles after several castings despite the gradual erosion of the inner layer of degradable refractory concrete.
  • the internal diameter of the nozzle which was 42 mm before casting, reached a value of 71 mm at the end of this casting.
  • This gradual increase in the internal diameter of the nozzles made it possible to maintain a substantially constant flow rate in spite of the decrease in the static pressure of the continuous molten steel in the ladle.
  • the present invention preferably relates to the casting of ladle steel, it is not limited to this single object; it also relates to the casting of other melting materials in the liquid state, for example non-ferrous materials, glass and the like.

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  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
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  • Compositions Of Oxide Ceramics (AREA)

Description

La présente invention est relative à une busette de coulée de matière en fusion convenant plus spécialement à l'acier liquide.The present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel.

On connaît des dispositifs de coulée équipant notamment les poches de coulée d'aciérie, à vidange par le fond. Ces dispositifs permettent l'écoulement intégral de l'acier contenu dans la poche.There are known pouring devices equipping in particular the steelworks pouring ladles, emptying from the bottom. These devices allow the complete flow of the steel contained in the pocket.

L'équipement de coulée de ces poches peut se présenter sous différentes formes. Il peut être notamment du type classique à quenouilles ou du type à plaques coulissantes. Dans le cas du type à plaques coulissantes, par exemple, l'équipement de coulée d'une poche d'aciérie est constitué d'au moins une busette interne, d'une busette externe et d'un système, situé entre les deux busettes, pour régler ou interrompre l'écoulement de la matière en fusion.The pouring equipment for these pockets can take various forms. It can in particular be of the conventional cattail type or of the sliding plate type. In the case of the sliding plate type, for example, the casting equipment for a steelworks pocket consists of at least one internal nozzle, one external nozzle and a system, located between the two nozzles. , to adjust or interrupt the flow of molten material.

La busette interne, appelée parfois busette collectrice, est insérée dans une brique de siège, qui fait partie de l'équipement de coulée, et est elle-même logée dans le garnissage réfractaire de la poche.The internal nozzle, sometimes called the collecting nozzle, is inserted into a seat brick, which is part of the casting equipment, and is itself housed in the refractory lining of the bag.

La busette externe, que l'on appelle parfois busette régulatrice, est située sous la poche dans le prolongement de la busette collectrice; elle sert notamment à calibrer et à centrer le jet de la coulée.The external nozzle, which is sometimes called a regulating nozzle, is located under the pocket in the extension of the collecting nozzle; it is used in particular to calibrate and center the casting jet.

Entre les deux busettes est disposé un système à plaques coulissantes planes ou cylindriques, assurant le réglage du débit de coulée de la matière en fusion, notamment de la vitesse de coulée.Between the two nozzles is disposed a system of flat or cylindrical sliding plates, ensuring the adjustment of the flow rate of the molten material, in particular the speed of casting.

Dans certains cas, les différents éléments constitutifs de l'équipement de coulée sont pourvus d'un moule, par exemple une enveloppe métallique, qui assure une mise en forme correcte des matériaux réfractaires requis pour leur fabrication et qui leur confère une certaine résistance aux sollicitations mécaniques.In some cases, the various constituent elements of the casting equipment are provided with a mold, for example a metal casing, which ensures correct shaping of the refractory materials required for their manufacture and which gives them a certain resistance to stresses. mechanical.

Jusqu'à présent, on a souvent utilisé, pour la fabrication des éléments constitutifs de l'équipement de coulée, des matériaux réfractaires cuits, dont le coût était évidemment conditionné par leur qualité.Hitherto, baked refractory materials have often been used for the manufacture of the constituent elements of casting equipment, the cost of which was obviously conditioned by their quality.

On a déjà proposé (voir notamment les FR-A 2 353 354, FR-A 2 388 622 et FR-A 2 397 252) de constituer certaines pièces d'un équipement de coulée notamment les bouchons, plaques d'obturation, dispositifs de fermeture de poches de coulée en béton réfractaire.It has already been proposed (see in particular FR-A 2 353 354, FR-A 2 388 622 and FR-A 2 397 252) to constitute certain parts of casting equipment, in particular plugs, blanking plates, closing of refractory concrete ladles.

De même, on a déjà proposé (voir le FR-A 3355596) de réaliser en béton réfractaire extra- alumineux à liant hydraulique des pièces d'usure d'équipements de coulée de métal fondu, notamment les busettes d'entrée et de sortie de ceux- ci.Similarly, it has already been proposed (see FR-A 3355596) to produce refractory extra-aluminous concrete with hydraulic binder of wear parts for equipment for casting molten metal, in particular the inlet and outlet nozzles of these.

Les busettes sont soumises, lors de la coulée de métal fondu à une érosion sévère, en sorte que leur durée de vie est extrêmement brève et dépasse rarement une opération de coulée. La section du chenal d'écoulement devient irrégulière, le jet de métal fondu est perturbé et la coulée est difficile. Il est donc nécessaire de remplacer souvent les busettes, ce qui entraîne des frais de démontage et de remontage, auxquels s'ajoute le prix de l'équipement lui-même.The nozzles are subjected, during the casting of molten metal, to severe erosion, so that their lifetime is extremely short and rarely exceeds a casting operation. The section of the flow channel becomes irregular, the jet of molten metal is disturbed and pouring is difficult. It is therefore necessary to replace the nozzles often, which leads to disassembly and reassembly costs, to which is added the price of the equipment itself.

DE-C 1 250 607 décrit une busette de coulée selon le préambule de la revendication 1 qui assure un débit de coulée sensiblement constant, en dépit de la diminution de la pression statique de l'acier en fusion contenu dans la poche de coulée, au fur et à mesure que cette poche se vide.DE-C 1 250 607 describes a pouring nozzle according to the preamble of claim 1 which ensures a substantially constant flow rate, despite the decrease in the static pressure of the molten steel contained in the ladle, at as this pocket becomes empty.

Cette busette contient plusieurs parties en matériaux différemment dégradables, la partie située vers la sortie étant la moins dégradable tandis que la partie située près de la poche de coulée est la plus dégradable. La construction d'une busette avec plusieurs parties est compliquée. Pour éviter cet inconvénient, la présente invention propose une busette de construction plus simple qui garde toutefois le débit de coulée sensiblement constant de la busette connue (DE-C 1250607)This nozzle contains several parts made of differently degradable materials, the part located towards the outlet being the least degradable while the part located near the ladle is the most degradable. Building a nozzle with several parts is complicated. To avoid this drawback, the present invention provides a simpler construction nozzle which nevertheless keeps the substantially constant flow rate of the known nozzle (DE-C 1250607)

La présente invention est relative à une busette de coulée de matière en fusion convenant plus spécialement à l'acier liquide, cette busette comprenant au moins une partie en un béton réfractaire non cuit et non comprimé, constitué (1) d'un granulat ou agrégat de particules contenant plus de 99% en poids d'alumine ayant subi un traitement thermique préalable jusqu'à la température de fusion ou de frittage et (2) d'un liant formé d'environ 75 à 85% en poids d'alumine, le reste du liant étant essentiellement de l'oxyde de calcium, ce liant ayant subi un traitement thermique préalable jusqu'à la température de fusion, ladite partie en béton réfractaire étant recouverte d'une couche de béton réfractaire dégradable susceptible de subir une érosion progressive due au contact des matières en fusion lors de leur coulée, de façon que cette coulée se fasse à un débit sensiblement constant.The present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel, this nozzle comprising at least one part of an uncooked and uncompressed refractory concrete, consisting (1) of an aggregate or aggregate of particles containing more than 99% by weight of alumina having undergone a prior heat treatment up to the melting or sintering temperature and (2) of a binder formed from approximately 75 to 85% by weight of alumina, the remainder of the binder being essentially calcium oxide, this binder having undergone a prior heat treatment up to the melting temperature, said refractory concrete part being covered with a layer of degradable refractory concrete capable of undergoing progressive erosion due to the contact of the molten materials during their casting, so that this casting takes place at a substantially constant flow rate.

La couche de béton dégradable de la busette suivant la présente invention est avantageusement constituée d'un béton réfractaire du type silico-alumineux ayant une teneur en alumine d'environ 45 à 65%, de préférence d'environ 47 à 50% en poids.The degradable concrete layer of the nozzle according to the present invention advantageously consists of a refractory concrete of the silico-aluminous type having an alumina content of approximately 45 to 65%, preferably approximately 47 to 50% by weight.

On peut également utiliser comme béton dégradable un béton réfractaire contenant environ 55 à 60% en poids d'alumine et de bioxyde de titane. La teneur en oxyde de fer (Fe203) de ces bétons dégradables ne peut dépasser 0,6%.It is also possible to use as degradable concrete a refractory concrete containing about 55 to 60% by weight of alumina and titanium dioxide. The iron oxide (Fe 2 0 3 ) content of these degradable concretes may not exceed 0.6%.

L'agrégat du béton réfractaire dégradable a avantageusement une teneur en alumine d'environ 45 à 65% en poids, le reste étant principalement constitué de silice. Quant au liant à prise hydraulique de ce béton, il est du type silico-alumineux conentant environ 25 à 40% en poids d'oxyde de calcium.The aggregate of degradable refractory concrete advantageously has an alumina content of approximately 45 to 65% by weight, the rest being mainly composed of silica. As for the binder with hydraulic setting of this concrete, it is of the silico-aluminous type containing approximately 25 to 40% by weight of calcium oxide.

Les parties en béton réfractaire dégradable peuvent être moulées in situ dans des busettes en béton réfractaire à teneur très élevée en alumine.The degradable refractory concrete parts can be molded in situ in refractory concrete nozzles with a very high alumina content.

La demanderesse a constaté que la couche de béton réfractaire dégradable adhère parfaitement à la partie de la busette à très haute teneur en alumine qui l'entoure et que cette partie subit une usure homogène à sa surface de contact avec le métal en fusion.The Applicant has found that the layer of degradable refractory concrete adheres perfectly to the part of the very high grade nozzle in alumina which surrounds it and that this part undergoes homogeneous wear on its contact surface with the molten metal.

Les exemples suivants illustrent l'invention.The following examples illustrate the invention.

Exemple 1Example 1

Composition d'un béton réfractaire neutre:

Figure imgb0001
Composition of neutral refractory concrete:
Figure imgb0001

Composition de l'agrégat en grains de 0 à 6 mm qui ont été préalablement traités thermiquement jusqu'à la température de fusion ou de frittage.

  • - plus de 99% d'alumine (AI203)
  • - moins de 0,1% de silice.
  • - moins de 0,2% d'oxyde de fer (Fe203)
  • - solide: mélange de magnésie, d'oxyde de potassium et d'oxyde de sodium.
Composition of the aggregate in grains from 0 to 6 mm which have been heat treated beforehand to the melting or sintering temperature.
  • - more than 99% of alumina (AI 2 0 3 )
  • - less than 0.1% silica.
  • - less than 0.2% iron oxide (Fe 2 0 3 )
  • - solid: mixture of magnesia, potassium oxide and sodium oxide.

Composition du liant en grains de moins de 50 micromètres traités thermiquement jusqu'à la température de fusion:

  • - 75 à 85% d'alumine
  • - 20% d'oxyde de calcium.
Composition of the binder in grains of less than 50 micrometers heat treated up to the melting temperature:
  • - 75 to 85% alumina
  • - 20% calcium oxide.

Le mélange d'agrégat et de liant dans les proportions susindiquées est additionnée d'un agent dispersant et stabilisant constitué de pyrophosphate de sodium ou de carbonate de sodium à raison d'environ 0,2% par rapport au liant.The mixture of aggregate and binder in the above-mentioned proportions is added with a dispersing and stabilizing agent consisting of sodium pyrophosphate or sodium carbonate in an amount of approximately 0.2% relative to the binder.

Les pièces en béton réfractaire sont obtenues en gâchant le mélange d'agrégat et de liant réfractaire avec une quantité minimale d'eau dans un moule. Avant la prise hydraulique du liant, le mélange est damé, compacté ou vibré.Refractory concrete parts are obtained by spoiling the mixture of aggregate and refractory binder with a minimum amount of water in a mold. Before the hydraulic setting of the binder, the mixture is packed, compacted or vibrated.

Exemple 2Example 2

Composition d'un béton réfractaire dégradable:

Figure imgb0002
Composition of degradable refractory concrete:
Figure imgb0002

Composition de l'agrégat (chamotte tendre élaborée entre 800 et 1100°C) en grains de 0 à 3mm:

  • - 60% d'alumine en grains
  • - 38% de silice (SiO2)
  • - 1% de Fe203
  • - 1% d'un mélange de magnésie, d'oxyde de potassium et d'oxyde de sodium.
Composition of the aggregate (soft chamotte prepared between 800 and 1100 ° C) in grains from 0 to 3mm:
  • - 60% alumina grains
  • - 38% silica (SiO 2 )
  • - 1% Fe 2 0 3
  • - 1% of a mixture of magnesia, potassium oxide and sodium oxide.

Composition du liant en grains inférieurs à 50 micromètres traités thermiquement jusqu'à la température de fusion:

  • - 50% d'alumine
  • - 10% de silice
  • - 40% d'oxyde de calcium.
Composition of the binder in grains less than 50 micrometers heat treated up to the melting temperature:
  • - 50% alumina
  • - 10% silica
  • - 40% calcium oxide.

Le mélange d'agrégat et de liant gâché avec un minimum d'eau est moulé in situ dans la partie intérieure d'une busette constituée de béton réfractaire du type décrit dans l'exemple 1.The mixture of aggregate and binder mixed with a minimum of water is molded in situ in the interior part of a nozzle made of refractory concrete of the type described in Example 1.

La demanderesse a constaté qu'en utilisant des busettes en béton réfractaire, selon l'exemple 1, garnies intérieurement d'une couche en béton réfractaire dégradable selon l'exemple 2, il ne se produit ni percée, ni fissuration des busettes après plusieurs coulées malgré l'érosion progressive de la couche interne de béton réfractaire dégradable.The Applicant has found that by using refractory concrete nozzles, according to Example 1, internally lined with a layer of degradable refractory concrete according to Example 2, there is no breakthrough or cracking of the nozzles after several castings despite the gradual erosion of the inner layer of degradable refractory concrete.

Par ailleurs, le diamètre intérieur de la busette qui était de 42 mm avant la coulée a atteint une valeur de 71 mm à la fin de cette coulée. Cette augmentation progressive du diamètre intérieur des busettes a permis de maintenir un débit de coulée sensiblement constant en dépit de la diminution de la pression statique de l'acier en fusion continu dans la poche de coulée.In addition, the internal diameter of the nozzle, which was 42 mm before casting, reached a value of 71 mm at the end of this casting. This gradual increase in the internal diameter of the nozzles made it possible to maintain a substantially constant flow rate in spite of the decrease in the static pressure of the continuous molten steel in the ladle.

Les busettes suivant l'invention présentent les avantages suivants:

  • 1. une réduction des incidents d'aciérie, par un meilleur centrage et un meilleur calibrage du jet et par une plus grande régularité du débit de coulée;
  • 2. une réduction de consommation du nombre d'équipements de coulée, dont la durée de vie est prolongée, ce qui procure:
  • 3. un bilan énergétique favorable: les bétons réfractaires ne nécessitent pas de cuisson préalable et acquièrent la résistance désirée par simple séchage à l'air;
The nozzles according to the invention have the following advantages:
  • 1. a reduction in steelworks incidents, by better centering and better calibration of the jet and by greater regularity of the flow rate;
  • 2. a reduction in consumption of the number of casting equipment, the service life of which is extended, which provides:
  • 3. a favorable energy balance: refractory concretes do not require prior curing and acquire the desired resistance by simple air drying;

Il est évident que l'invention n'est pas limitée aux détails décrits plus haut et que de nombreuses modifications peuvent y être apportées sans sortir du cadre de l'invention tel que défini pour les revendications.It is obvious that the invention is not limited to the details described above and that numerous modifications can be made thereto without departing from the scope of the invention as defined for the claims.

Ainsi, bien que la présente invention se rapporte de préférence à la coulée de l'acier en poche, elle ne se limite pas à cet unique objet; elle concerne également la coulée d'autres matières de fusion à l'état liquide, par exemple les matières non ferreuses, le verre et autres matières de ce genre.Thus, although the present invention preferably relates to the casting of ladle steel, it is not limited to this single object; it also relates to the casting of other melting materials in the liquid state, for example non-ferrous materials, glass and the like.

Claims (7)

1. A casting nozzle for molten material and more particularly suitable for liquid steel, characterized in that it comprises at least one part of unburned uncompressed concrete consisting of (1) a granulate or aggregate of particules containing more than 99% by weight of alumina which has previously undergone heat treatment up to the temperature of fusion or fritting and (2) a binder consisting of from about 75 to 85% by weight of alumina, the rest of the binder substantially consisting of calcium oxide, this binder having previously undergone heat treatment up to the temperature of fusion, said part being covered with a layer of degradable refractory concrete which is likely to undergo gradual erosion due to contact with the molten materials as they are cast.
2. A nozzle according to claim 1, characterized in that the degradable refractory concrete contains, as aggregate, a soft chamotte which has been previously treated at a temperature of from 800 to 1100 °C.
3. A nozzle according to anyone of claims 1 and 2, characterized in that the degradable refractory concrete is of silico-aluminous type consisting of from about 45 to 65% by weight of alumina.
4. A nozzle according to claim 3, characterized in that the alumina content of the degradable refractory concrete is from about 47 to 50% by weight of the dry mixture.
5. A nozzle according to anyone of the preceding claims, characterized in that the degradable refractory concrete contains an agregate, the alumina content of which is from about 45 to 65% by weight of alumina, the rest mainly consisting of silica.
6. A nozzle according to anyone of the preceding claims, characterized in that the degradable refractory concrete contains a hydraulically setting silico-aluminous binder containing from about 25 to 40% by weight of calcium oxide.
7. A nozzle according to anyone of claims 3 and 4, characterized in that the degradable refractory concrete contains about 85% by weight of agregate and about 15% by weight of binder.
EP19810200701 1980-06-27 1981-06-22 Casting equipment for fused masses Expired EP0043160B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200701T ATE11382T1 (en) 1980-06-27 1981-06-22 CASTING EQUIPMENT FOR MOLTEN MATERIALS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE55215 1980-06-27
BE5/5215A BE884080A (en) 1980-06-27 1980-06-27 IMPROVEMENT IN EQUIPMENT FOR CASTING FUSED MATERIAL AND THEIR MANUFACTURING PROCESS.
BE203293 1980-12-23
BE203293 1980-12-23

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EP0043160A1 EP0043160A1 (en) 1982-01-06
EP0043160B1 EP0043160B1 (en) 1985-01-23
EP0043160B2 true EP0043160B2 (en) 1989-07-05

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841539A (en) * 1973-03-01 1974-10-15 United States Steel Corp Collector nozzle for slidable gates
ZA763385B (en) * 1976-05-31 1977-05-25 Den Speulhof P Van A hydraulically setting high-alumina refractory concrete
GB1593371A (en) * 1976-06-25 1981-07-15 Didier Werke Ag Refractory structures
ATA743878A (en) * 1977-10-17 1987-06-15 Gen Refractories Co METHOD FOR PRODUCING A SLIDER PLATE FOR A SLIDER LOCK FOR MOLTEN MATERIALS
DE2718701C3 (en) * 1977-04-27 1988-05-26 Didier-Werke Ag, 6200 Wiesbaden Self-supporting slide plate
CS199377B1 (en) * 1977-05-13 1980-07-31 Valter Boehm Connecting method of at least two ceramic materials
DE2732094A1 (en) * 1977-07-15 1979-01-18 Didier Werke Ag SLIDING CLOSURE FOR VESSELS CONTAINING METAL MELT
GB2065278B (en) * 1979-12-14 1983-10-12 Flogates Ltd Composite moulded refractory articles amd their manufacture

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EP0043160B1 (en) 1985-01-23
DE3168457D1 (en) 1985-03-07

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