EP0043160B2 - Casting equipment for fused masses - Google Patents
Casting equipment for fused masses Download PDFInfo
- 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
- Authority
- 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
Links
- 238000005266 casting Methods 0.000 title claims description 22
- 239000004567 concrete Substances 0.000 claims description 31
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000012768 molten material Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 230000003628 erosive effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims 2
- 239000008187 granular material Substances 0.000 claims 1
- 230000008018 melting Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 2
- 229910001950 potassium oxide Inorganic materials 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 229910001948 sodium oxide Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 240000001398 Typha domingensis Species 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011821 neutral refractory Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
- 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.
Composition d'un béton réfractaire neutre:
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.
- - 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.
- - 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.
Composition d'un béton réfractaire dégradable:
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.
- - 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.
- - 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;
- 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)
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 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0043160A1 EP0043160A1 (en) | 1982-01-06 |
EP0043160B1 EP0043160B1 (en) | 1985-01-23 |
EP0043160B2 true EP0043160B2 (en) | 1989-07-05 |
Family
ID=25652381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810200701 Expired EP0043160B2 (en) | 1980-06-27 | 1981-06-22 | Casting equipment for fused masses |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0043160B2 (en) |
DE (1) | DE3168457D1 (en) |
Family Cites Families (8)
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 |
-
1981
- 1981-06-22 EP EP19810200701 patent/EP0043160B2/en not_active Expired
- 1981-06-22 DE DE8181200701T patent/DE3168457D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0043160A1 (en) | 1982-01-06 |
EP0043160B1 (en) | 1985-01-23 |
DE3168457D1 (en) | 1985-03-07 |
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