EP0855237A1 - Improved device for gas insufflation into a molten metal - Google Patents

Improved device for gas insufflation into a molten metal Download PDF

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Publication number
EP0855237A1
EP0855237A1 EP98400132A EP98400132A EP0855237A1 EP 0855237 A1 EP0855237 A1 EP 0855237A1 EP 98400132 A EP98400132 A EP 98400132A EP 98400132 A EP98400132 A EP 98400132A EP 0855237 A1 EP0855237 A1 EP 0855237A1
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EP
European Patent Office
Prior art keywords
channels
refractory
main
gas
molten metal
Prior art date
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EP98400132A
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German (de)
French (fr)
Inventor
Gérard Barrere
Urs Steiner
Jean-Pierre Gakyere
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Savoie Refractaires SA
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Savoie Refractaires SA
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Publication of EP0855237A1 publication Critical patent/EP0855237A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the present invention relates to techniques for processing metals and alloys, and more particularly relates to a device blowing a gas into molten metal in a reactor or metallurgical pocket.
  • Devices of this type are commonly used in industry metallurgical for blowing an inert or oxidizing gas into a molten metal, for example in a reactor or ladle metallurgical treatment, for agitation or bath treatment.
  • a device of the prior art generally comprises either a refractory block with mass porosity, i.e. made of material porous refractory with high open porosity, ie a refractory block with porosity directed, that is to say comprising at least one channel through which the gas can be blown into the molten metal bath, this block can be single-component or two-component type.
  • This block is generally preferred because with lower wear speeds and higher flow rates, that is to say an increased service life and yield relative to the former.
  • the document EP-A 0 329 645 has proposed a brick intended for injecting a gas which has continuous channels having, at least in the area surrounding the upper front face of the brick, a spiral shape or zigzag.
  • the depth of penetration relative to the main axis of the brick is less in said device than in a device employing vertical channels, this being due to the relatively low gradient of the channels and the surface tension effect of the inner wall of the channels.
  • EP-A 0 329 645 actually only displaces the level blockage of the channels and offers no security in the event of obstruction.
  • the object of the invention is to provide a device of the aforementioned type which allows continuity of gas insufflation and overcomes the problem shutter channels.
  • the invention takes advantage of the wear of the device under the effect of the molten metal, this wear putting in service, so deferred, auxiliary channels initially inoperative.
  • the invention more specifically relates to an insufflation device of a gas in molten metal contained in a reactor or ladle metallurgical, which has a body of refractory material and channels main which pass through the refractory body from its underside intended to be connected to a gas supply up to its upper face intended to be in contact with the metal bath and a metal carcass surrounding said body with the exception of said upper face, characterized in which it further comprises at least one blind auxiliary channel whose the upper end is at a level below said surface upper body and whose lower end opens onto said face lower.
  • This device is intended to be positioned, interchangeably, in a suitable housing provided in the bottom of the reactor or of the pocket metallurgical.
  • the ends of all the blind auxiliary channels are located at the same level.
  • the ends upper blind auxiliary channels are located at least two different levels.
  • the upper ends of the auxiliary channels are located at one or more levels between 0.5 and 0.8 times, preferably between 0.6 and 0.7 times, the height of the refractory body.
  • the optimal level can be determined by analyzing the dysfunctions observed with the conventional devices. This optimal level will be where the auxiliary channels will enter into service before total obstruction of the main channels.
  • the channels can be arranged in any way, we prefer that the channels are arranged near the vertical axis of the element and that the blind auxiliary channels are arranged in the vicinity of said channels main and parallel to them.
  • Main and auxiliary channels can have a section any transverse, for example cylindrical, slit-shaped, etc.
  • the main and auxiliary channels can have a rectilinear shape, helical, zigzag, etc ...
  • the cross sections of the auxiliary channels and channels main ones may have a similar or different size.
  • the size of channels will usually be 0.2mm to 0.6mm in the lowest dimension.
  • the device can easily be replaced by a new device without having to redo the entire bottom of the reactor or pocket metallurgical.
  • Figure 8 is a vertical sectional view of a following device the invention, the erosion level of which has reached the level of the end auxiliary channels, putting them into service, and whose some of the main channels are blocked.
  • Figure 1 a type of insufflation device monocomponent of the prior art.
  • This device comprises a carcass 1 surround in the form of a truncated cone, for example of welded sheet metal, and a refractory matrix 2, for example in refractory concrete, traversed from bottom to high by straight channels 3.
  • the matrix rests on a plate refractory 4 of high open porosity serving to distribute the gas to the channels and also anti-piercing security plate.
  • the carcass is provided with its base of a gas inlet tube 5 which can be connected to a gas source to breathe.
  • This type of device is usually made by pouring directly refractory concrete in the carcass after positioning of the porous plate at the bottom of the carcass and wires or strips of a material thermally eliminable, then, after setting the concrete, to bake the whole to a temperature high enough to remove the wires or bands and create channels 3.
  • Figure 2 is shown a type of insufflation device bicomponent of the prior art.
  • This device differs from the previous one in that the channels, instead of being formed directly within the matrix refractory, are within a refractory block 6 of prismatic shape or cylindrical, which can be made by pressing, then cooking at high temperature of a refractory material based on oxide (s) or other.
  • the channels are formed in the block by placing inserts thermally removable.
  • the device is then easily manufactured by placing, in the metal carcass, of the plate 4 and of the block 6, then by pouring refractory concrete to form the matrix 2.
  • the refractory block 6 can be formed of a plurality of judiciously grooved juxtaposed vertical plates, the grooves serving to form the aforementioned channels.
  • FIGS. 3 and 4 are shown insufflation devices according to the invention, of the single-component type and of the two-component type, respectively. These devices differ from the devices of FIGS. 1 and 2 in what they include, in addition to the main 3 channels, channels blind auxiliaries 7, provided at the periphery of the channels 3 and extending from the lower part 8 of the matrix 2 to a level 9 below the upper front part 10 of said matrix, which will be in contact with molten metal.
  • FIG. 5 an alternative embodiment of a two-component type insufflation device according to the invention.
  • This variant differs from the device of Figure 4 in that the main channels 3 and the blind auxiliary channels 7 are formed in separate blocks.
  • the main channels 3 are formed in a central block 6 a
  • the auxiliary channels 7 are formed in two blocks 6 b flanking the block 6 a .
  • Figure 6 illustrates yet another alternative embodiment of a two-component type device according to the invention.
  • the channels main 3 and auxiliary 7 result from the juxtaposition of a plurality of vertical plates 10 provided with grooves 11 also vertical.
  • Figure 7 illustrates the erosion that the matrix undergoes over time refractory 2 and the infiltrations of molten steel of which the canals are victims main 3, resulting in partial obstruction of these.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Coating With Molten Metal (AREA)

Abstract

A device is claimed for blowing a gas into a molten metal contained in a reactor or metallurgical ladle. It comprises a body (2) of refractory material and some main channels (3) that cross through the refractory body (2) form its lower face destined to be connected to a gas feed system to its upper face destined to be put in contact with the bath of molten metal. A metal carcass (1) surrounds the refractory body, with the exception of the upper face. It also incorporates at least one auxiliary recessed channel (7) of which the upper end is found at a level below the upper face of the body and its lower end emerges in the lower face.

Description

La présente invention est relative aux techniques de traitement des métaux et des alliages, et elle concerne plus particulièrement un dispositif d'insufflation d'un gaz dans du métal fondu se trouvant dans un réacteur ou poche métallurgique.The present invention relates to techniques for processing metals and alloys, and more particularly relates to a device blowing a gas into molten metal in a reactor or metallurgical pocket.

Des dispositifs de ce type sont couramment utilisés dans l'industrie métallurgique pour insuffler un gaz inerte ou oxydant dans un bain de métal en fusion, se trouvant, par exemple dans un réacteur ou poche de traitement métallurgique, à des fins d'agitation ou de traitement du bain.Devices of this type are commonly used in industry metallurgical for blowing an inert or oxidizing gas into a molten metal, for example in a reactor or ladle metallurgical treatment, for agitation or bath treatment.

Un dispositif de la technique antérieure comprend en général soit un bloc réfractaire à porosité de masse, c'est-à-dire constitué de matériau réfractaire poreux à forte porosité ouverte, soit un bloc réfractaire à porosité dirigée, c'est-à-dire comportant au moins un canal à travers lequel le gaz peut être insufflé dans le bain de métal en fusion, ce bloc pouvant être de type monocomposant ou bicomposant. Ce dernier est généralement préféré car présentant des vitesses d'usure plus faibles et des débits plus élevés, soit une durée de vie et un rendement accrus relativement au premier.A device of the prior art generally comprises either a refractory block with mass porosity, i.e. made of material porous refractory with high open porosity, ie a refractory block with porosity directed, that is to say comprising at least one channel through which the gas can be blown into the molten metal bath, this block can be single-component or two-component type. The latter is generally preferred because with lower wear speeds and higher flow rates, that is to say an increased service life and yield relative to the former.

Cependant, un problème rencontré avec les dispositifs d'insufflation de l'art antérieur est l'obstruction des canaux due à l'infiltration d'acier dans ceux-ci au cours des cycles d'utilisation successifs. Ces infiltrations provoquent des baisses de débit de gaz pouvant aller jusqu'à la cessation du fonctionnement du dispositif.However, a problem encountered with insufflation devices of the prior art is the obstruction of the channels due to the infiltration of steel in these during successive cycles of use. These infiltrations cause gas flow reductions up to and including the cessation of operation of the device.

Afin de remédier à ce problème de l'obstruction des canaux le document EP-A 0 329 645 a proposé une brique destinée à injecter un gaz qui comporte des canaux continus ayant, au moins dans la zone environnant la face supérieure frontale de la brique, une forme de spirale ou de zig-zag. Ainsi, pour une même distance parcourue par les gouttes de métal fondu, la profondeur de pénétration rapportée à l'axe principal de la brique est moindre dans ledit dispositif que dans un dispositif employant des canaux verticaux, cela étant dû à la relativement faible déclivité des canaux et à l'effet de tension superficielle de la paroi interne des canaux.In order to remedy this problem of the obstruction of the channels the document EP-A 0 329 645 has proposed a brick intended for injecting a gas which has continuous channels having, at least in the area surrounding the upper front face of the brick, a spiral shape or zigzag. Thus, for the same distance traveled by the drops of molten metal, the depth of penetration relative to the main axis of the brick is less in said device than in a device employing vertical channels, this being due to the relatively low gradient of the channels and the surface tension effect of the inner wall of the channels.

Toutefois, ces nouvelles formes et disposition des canaux n'évitent pas la pénétration de gouttes de métal fondu plus profondément dans lesdits canaux, lesquelles gouttes atteindront sur leur parcours, un niveau où la température ambiante sera en dessous de leur température de fusion. Elles se solidifieront alors à ce niveau. De surcroít, le dispositif est difficile à mettre en oeuvre étant donné la non-linéarité des canaux.However, these new forms and arrangement of channels do not avoid not the penetration of drops of molten metal deeper into said channels, which drops will reach a level on their course where the ambient temperature will be below their melting temperature. They will then solidify at this level. In addition, the device is difficult to be implemented given the non-linearity of the channels.

Le document EP-A 0 329 645 ne fait en réalité que déplacer le niveau d'obturation des canaux et n'offre aucune sécurité en cas d'obstruction.EP-A 0 329 645 actually only displaces the level blockage of the channels and offers no security in the event of obstruction.

Ainsi, dans l'industrie métallurgique, on est obligé de surveiller avec soin le libre passage du gaz dans les canaux du bloc réfractaire car c'est de celui-ci que dépendent la qualité des produits et le rendement de l'installation.So, in the metallurgical industry, we have to monitor with care the free passage of gas in the refractory block channels because it is which depend on the quality of the products and the yield of the installation.

L'invention a pour but de fournir un dispositif du type précité qui permet la continuité de l'insufflation de gaz et permet de pallier le problème de l'obturation des canaux. L'invention tire parti de l'usure du dispositif sous l'effet du métal en fusion, cette usure mettant en service, de façon différée, des canaux auxiliaires initialement inopérants.The object of the invention is to provide a device of the aforementioned type which allows continuity of gas insufflation and overcomes the problem shutter channels. The invention takes advantage of the wear of the device under the effect of the molten metal, this wear putting in service, so deferred, auxiliary channels initially inoperative.

L'invention a plus précisément pour objet un dispositif d'insufflation d'un gaz dans du métal fondu contenu dans un réacteur ou poche métallurgique, qui comporte un corps en matériau réfractaire et des canaux principaux qui traversent le corps réfractaire de sa face inférieure destinée à être raccordée à une alimentation en gaz jusqu'à sa face supérieure destinée à être en contact avec le bain de métal et une carcasse métallique entourant ledit corps à l'exception de ladite face supérieure, caractérisé en ce qu'il comprend en outre au moins un canal auxiliaire borgne dont l'extrémité supérieure se trouve à un niveau inférieur à ladite surface supérieure du corps et dont l'extrémité inférieure débouche sur ladite face inférieure. The invention more specifically relates to an insufflation device of a gas in molten metal contained in a reactor or ladle metallurgical, which has a body of refractory material and channels main which pass through the refractory body from its underside intended to be connected to a gas supply up to its upper face intended to be in contact with the metal bath and a metal carcass surrounding said body with the exception of said upper face, characterized in which it further comprises at least one blind auxiliary channel whose the upper end is at a level below said surface upper body and whose lower end opens onto said face lower.

Ce dispositif est destiné à être positionné, de façon interchangeable, dans un logement adéquat prévu dans le fond du réacteur ou de la poche métallurgique.This device is intended to be positioned, interchangeably, in a suitable housing provided in the bottom of the reactor or of the pocket metallurgical.

En service, du fait de l'usure progressive du dispositif, l'extrémité supérieure du ou des canaux auxiliaires qui se trouvait initialement à un niveau inférieur à la face frontale supérieure, est rejointe par cette dernière, le ou les canaux auxiliaires venant alors suppléer les canaux principaux au moment où ces derniers risquent de ne plus remplir leur fonction pour cause d'obstruction.In service, due to the progressive wear of the device, the end of the auxiliary channel (s) which was originally at a level below the upper front face, is joined by this last, the auxiliary channel or channels then replacing the channels principal at the time when the latter risk of no longer fulfilling their function due to obstruction.

Selon un mode de réalisation de l'invention, les extrémités supérieures de tous les canaux auxiliaires borgnes sont situées à un même niveau.According to one embodiment of the invention, the ends of all the blind auxiliary channels are located at the same level.

Selon un autre mode de réalisation de l'invention, les extrémités supérieures des canaux auxiliaires borgnes sont situées à au moins deux niveaux différents.According to another embodiment of the invention, the ends upper blind auxiliary channels are located at least two different levels.

Avantageusement les extrémités supérieures des canaux auxiliaires sont situées à un ou des niveaux compris entre 0,5 et 0,8 fois, de préférence entre 0,6 et 0,7 fois, la hauteur du corps réfractaire. Le niveau optimal peut être déterminé par analyse des dysfonctionnements observés avec les dispositifs classiques. Ce niveau optimal sera celui où les canaux auxiliaires entreront en service avant obstruction totale des canaux principaux.Advantageously, the upper ends of the auxiliary channels are located at one or more levels between 0.5 and 0.8 times, preferably between 0.6 and 0.7 times, the height of the refractory body. The optimal level can be determined by analyzing the dysfunctions observed with the conventional devices. This optimal level will be where the auxiliary channels will enter into service before total obstruction of the main channels.

Bien que dans le dispositif de l'invention, les canaux puissent être disposés de quelque manière que ce soit, on préfère que les canaux principaux soient disposés à proximité de l'axe vertical de l'élément et que les canaux auxiliaires borgnes soient disposés au voisinage desdits canaux principaux et parallèlement à ceux-ci.Although in the device of the invention, the channels can be arranged in any way, we prefer that the channels are arranged near the vertical axis of the element and that the blind auxiliary channels are arranged in the vicinity of said channels main and parallel to them.

Les canaux principaux et auxiliaires peuvent avoir une section transversale quelconque, par exemple cylindrique, en forme de fente, etc... Les canaux principaux et auxiliaires peuvent avoir une forme rectiligne, hélicoïdale, en zig-zag, etc...Main and auxiliary channels can have a section any transverse, for example cylindrical, slit-shaped, etc. The main and auxiliary channels can have a rectilinear shape, helical, zigzag, etc ...

Les sections transversales des canaux auxiliaires et des canaux principaux peuvent avoir une taille similaire ou différente. La taille des canaux sera habituellement de 0,2 mm à 0,6 mm dans la plus faible dimension.The cross sections of the auxiliary channels and channels main ones may have a similar or different size. The size of channels will usually be 0.2mm to 0.6mm in the lowest dimension.

Une fois usé, le dispositif peut aisément être remplacé par un dispositif neuf sans avoir à refaire tout le fond du réacteur ou poche métallurgique.Once worn, the device can easily be replaced by a new device without having to redo the entire bottom of the reactor or pocket metallurgical.

D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description qui va suivre, donnée uniquement à titre d'exemples et faite en se référant aux dessins annexés sur lesquels :

  • la figure 1 et la figure 2 sont des vues en coupe verticale de dispositifs de la technique antérieure, respectivement des types monocomposant et bicomposant.
  • les figures 3 à 6 sont des vues en coupe verticale de différents modes de réalisation d'un dispositif suivant l'invention.
  • la figure 7 est une vue en coupe verticale d'un dispositif suivant l'invention dont la surface supérieure a été érodée et dont certains des canaux principaux ont été infiltrés par du métal fondu.
Other characteristics and advantages of the invention will become apparent during the description which follows, given solely by way of examples and made with reference to the appended drawings in which:
  • FIG. 1 and FIG. 2 are views in vertical section of devices of the prior art, of the single-component and two-component types respectively.
  • Figures 3 to 6 are views in vertical section of different embodiments of a device according to the invention.
  • Figure 7 is a vertical sectional view of a device according to the invention, the upper surface has been eroded and some of the main channels have been infiltrated by molten metal.

la figure 8 est une vue en coupe verticale d'un dispositif suivant l'invention, dont le niveau d'érosion a atteint le niveau de l'extrémité supérieure des canaux auxiliaires, mettant ces derniers en service, et dont certains des canaux principaux sont obturés.Figure 8 is a vertical sectional view of a following device the invention, the erosion level of which has reached the level of the end auxiliary channels, putting them into service, and whose some of the main channels are blocked.

Sur la figure 1 est représenté un dispositif d'insufflation du type monocomposant de l'art antérieur. Ce dispositif comprend une carcasse 1 d'entourage en forme de tronc de cône , par exemple en tôle soudée, et une matrice réfractaire 2, par exemple en béton réfractaire, traversée de bas en haut par des canaux rectilignes 3. La matrice repose sur une plaque réfractaire 4 de porosité ouverte élevée servant à distribuer le gaz aux canaux et aussi de plaque de sécurité anti-percée. La carcasse est pourvue à sa base d'un tube 5 d'arrivée de gaz pouvant être reliée à une source du gaz à insuffler.In Figure 1 is shown a type of insufflation device monocomponent of the prior art. This device comprises a carcass 1 surround in the form of a truncated cone, for example of welded sheet metal, and a refractory matrix 2, for example in refractory concrete, traversed from bottom to high by straight channels 3. The matrix rests on a plate refractory 4 of high open porosity serving to distribute the gas to the channels and also anti-piercing security plate. The carcass is provided with its base of a gas inlet tube 5 which can be connected to a gas source to breathe.

Ce type de dispositif est habituellement fabriqué en coulant directement du béton réfractaire dans la carcasse après positionnement de la plaque poreuse au fond de la carcasse et de fils ou bandes en un matériau thermiquement éliminable, puis, après prise du béton, à cuire l'ensemble à une température suffisamment élevée pour éliminer les fils ou bandes et créer les canaux 3.This type of device is usually made by pouring directly refractory concrete in the carcass after positioning of the porous plate at the bottom of the carcass and wires or strips of a material thermally eliminable, then, after setting the concrete, to bake the whole to a temperature high enough to remove the wires or bands and create channels 3.

Sur la figure 2 est représenté un dispositif d'insufflation du type bicomposant de l'art antérieur. Ce dispositif diffère du précédent en ce que les canaux, au lieu d'être ménagés directement au sein de la matrice réfractaire, le sont au sein d'un bloc réfractaire 6 de forme prismatique ou cylindrique, qui peut être fabriqué par pressage, puis cuisson à haute température d'un matériau réfractaires à base d'oxyde(s) ou autre. Là encore, les canaux sont formés dans le bloc par mise en place d'inserts thermiquement éliminables. Le dispositif est aisément fabriqué ensuite par mise en place, dans la carcasse métallique, de la plaque 4 et du bloc 6, puis par coulée de béton réfractaire pour former la matrice 2.In Figure 2 is shown a type of insufflation device bicomponent of the prior art. This device differs from the previous one in that the channels, instead of being formed directly within the matrix refractory, are within a refractory block 6 of prismatic shape or cylindrical, which can be made by pressing, then cooking at high temperature of a refractory material based on oxide (s) or other. The again, the channels are formed in the block by placing inserts thermally removable. The device is then easily manufactured by placing, in the metal carcass, of the plate 4 and of the block 6, then by pouring refractory concrete to form the matrix 2.

En variante le bloc réfractaire 6 peut être formé d'une pluralité de plaquettes verticales juxtaposées judicieusement rainurées, les rainures servant à former les canaux précités.As a variant, the refractory block 6 can be formed of a plurality of judiciously grooved juxtaposed vertical plates, the grooves serving to form the aforementioned channels.

Sur les figures 3 et 4 sont représentés des dispositifs d'insufflation selon l'invention, du type monocomposant et du type bicomposant, respectivement. Ces dispositifs diffèrent des dispositifs des figures 1 et 2 en ce qu'ils comportent, en plus des canaux 3 principaux, des canaux auxiliaires borgnes 7, prévus à la périphérie des canaux 3 et s'étendant depuis la partie inférieure 8 de la matrice 2 jusqu'à un niveau 9 inférieur à la partie frontale supérieure 10 de ladite matrice, qui sera en contact avec le métal en fusion.In FIGS. 3 and 4 are shown insufflation devices according to the invention, of the single-component type and of the two-component type, respectively. These devices differ from the devices of FIGS. 1 and 2 in what they include, in addition to the main 3 channels, channels blind auxiliaries 7, provided at the periphery of the channels 3 and extending from the lower part 8 of the matrix 2 to a level 9 below the upper front part 10 of said matrix, which will be in contact with molten metal.

Sur la figure 5, on a représenté une variante de réalisation d'un dispositif d'insufflation du type bicomposant selon l'invention.In FIG. 5, an alternative embodiment of a two-component type insufflation device according to the invention.

Cette variante se distingue du dispositif de la figure 4 par le fait que les canaux principaux 3 et les canaux auxiliaires borgnes 7 sont ménagés dans des blocs distincts. Ainsi les canaux principaux 3 sont ménagés dans un bloc 6a central, tandis que les canaux auxiliaires 7 sont ménagés dans deux blocs 6b flanquant le bloc 6a. This variant differs from the device of Figure 4 in that the main channels 3 and the blind auxiliary channels 7 are formed in separate blocks. Thus the main channels 3 are formed in a central block 6 a , while the auxiliary channels 7 are formed in two blocks 6 b flanking the block 6 a .

La figure 6 illustre encore une autre variante de réalisation d'un dispositif du type bicomposant selon l'invention. Dans ce cas, les canaux principaux 3 et auxiliaires 7 résultent de la juxtaposition d'une pluralité de plaquettes 10 verticales pourvues de rainures 11 également verticales.Figure 6 illustrates yet another alternative embodiment of a two-component type device according to the invention. In this case, the channels main 3 and auxiliary 7 result from the juxtaposition of a plurality of vertical plates 10 provided with grooves 11 also vertical.

La figure 7 illustre l'érosion que subit au cours du temps la matrice réfractaire 2 et les infiltrations d'acier fondu dont sont victimes les canaux principaux 3, avec pour résultat l'obstruction partielle de ceux-ci.Figure 7 illustrates the erosion that the matrix undergoes over time refractory 2 and the infiltrations of molten steel of which the canals are victims main 3, resulting in partial obstruction of these.

Sur la figure 8, on peut voir qu'après un certain nombre de cycles d'utilisation, le niveau d'érosion atteint le niveau des extrémités supérieures des canaux auxiliaires borgnes 7, ce qui a pour effet de déboucher ceux-ci et de permettre d'insuffler du gaz à travers eux avant que tous les canaux principaux 3 ne soient obturés.In figure 8, we can see that after a certain number of cycles of use, the level of erosion reaches the level of the extremities upper blind auxiliary channels 7, which has the effect of unclog these and allow gas to be blown through them before all the main channels 3 are not blocked.

Il va de soi que les modes de réalisation décrits ne sont que des exemples et qu'on pourrait les modifier, notamment par substitution d'équivalents techniques, sans sortir pour cela du cadre de l'invention.It goes without saying that the embodiments described are only examples and that we could modify them, in particular by substitution technical equivalents, without departing from the scope of the invention.

Claims (13)

Dispositif d'insufflation d'un gaz dans du métal fondu contenu dans un réacteur ou poche métallurgique, qui comporte un corps en matériau réfractaire et des canaux principaux (3) qui traversent le corps réfractaire (2) de sa face inférieure destinée à être raccordée à une alimentation en gaz jusqu'à sa face supérieure destinée à être en contact avec le bain de métal et une carcasse métallique (1) entourant ledit corps à l'exception de ladite face supérieure, caractérisé en ce qu'il comprend en outre au moins un canal auxiliaire borgne (7) dont l'extrémité supérieure se trouve à un niveau inférieur à ladite surface supérieure du corps et dont l'extrémité inférieure débouche sur ladite face inférieure.Device for blowing a gas into molten metal contained in a metallurgical reactor or ladle, which has a body made of refractory material and main channels (3) which pass through the body refractory (2) from its underside intended to be connected to a gas supply to its upper face intended to be in contact with the metal bath and a metal carcass (1) surrounding said body with the exception of said upper face, characterized in that it comprises in addition to at least one blind auxiliary channel (7) whose upper end is found at a level lower than said upper surface of the body and whose the lower end opens onto said lower face. Dispositif selon la revendication 1, caractérisé en ce que les extrémités supérieures de tous les canaux auxiliaires borgnes sont situées à un même niveau.Device according to claim 1, characterized in that the upper ends of all blind auxiliary channels are located at the same level. Dispositif selon la revendication 1, caractérisé en ce que les extrémités supérieures des canaux auxiliaires borgnes sont situées à au moins deux niveaux différents.Device according to claim 1, characterized in that the upper ends of the blind auxiliary channels are located at minus two different levels. Dispositif selon l'une quelconque des revendications 1, 2 ou 3, caractérisé en ce que les extrémités supérieures des canaux auxiliaires sont situées à un ou des niveaux compris entre 0,5 et 0,8 fois la hauteur du corps réfractaire.Device according to any one of claims 1, 2 or 3, characterized in that the upper ends of the auxiliary channels are located at one or more levels between 0.5 and 0.8 times the height of the body refractory. Dispositif selon la revendication 4, caractérisé en ce que les extrémités supérieures des canaux auxiliaires sont situées à un ou des niveaux compris entre 0,6 et 0,7 fois la hauteur du corps réfractaire.Device according to claim 4, characterized in that the upper ends of the auxiliary channels are located at one or more levels between 0.6 and 0.7 times the height of the refractory body. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les canaux principaux sont disposés à proximité de l'axe vertical de l'élément et les canaux auxiliaires borgnes sont disposés au voisinage desdits canaux principaux et parallèlement à ceux-ci.Device according to any one of Claims 1 to 5, characterized in that the main channels are arranged close to the vertical axis of the element and the blind auxiliary channels are arranged at the in the vicinity of and parallel to said main channels. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il est du type monocomposant.Device according to any one of Claims 1 to 6, characterized in that it is of the one-component type. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il est du type bicomposant. Device according to any one of Claims 1 to 6, characterized in that it is of the two-component type. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les canaux principaux et auxiliaires sont rectilignes.Device according to any one of Claims 1 to 8, characterized in that the main and auxiliary channels are rectilinear. Dispositif selon l'une quelconque des revendications 1 à 6 et 9, caractérisé en ce que les canaux sont formés par une juxtaposition de plaquettes verticales rainurées.Device according to any one of Claims 1 to 6 and 9, characterized in that the channels are formed by a juxtaposition of grooved vertical pads. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que ladite carcasse (1) est tronconique.Device according to any one of Claims 1 to 10, characterized in that said carcass (1) is frustoconical. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'il comporte, en outre, une plaque réfractaire (4) de porosité élevée, disposée entre la face inférieure du corps et le fond de la carcasse métallique.Device according to any one of Claims 1 to 11, characterized in that it further comprises a refractory plate (4) of high porosity, arranged between the underside of the body and the bottom of the metal carcass. Dispositif selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la carcasse métallique est pourvue à sa base d'un tube (5) d'arrivée du gaz.Device according to any one of Claims 1 to 12, characterized in that the metal carcass is provided at its base with a tube (5) gas inlet.
EP98400132A 1997-01-23 1998-01-22 Improved device for gas insufflation into a molten metal Withdrawn EP0855237A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9700680A FR2758486B1 (en) 1997-01-23 1997-01-23 IMPROVED DEVICE FOR BLOWING A GAS INTO A MOLTEN METAL
FR9700680 1997-01-23

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EP0855237A1 true EP0855237A1 (en) 1998-07-29

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BR (1) BR9800444A (en)
CA (1) CA2227725A1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3517634A4 (en) * 2016-09-19 2020-01-29 Korea Refractories Co., Ltd. Multi-stage porous plug

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DE230090C (en) *
DE898598C (en) * 1943-10-24 1954-01-11 Hoerder Huettenunion Ag Converter bottom and its use for the production of steel by the basic wind-freshening process
DE1029400B (en) * 1951-11-19 1958-05-08 Siderurgie Fse Inst Rech Bessemer or Thomaskonverter with enlarged peripheral blowing surface of the blowing base
EP0080403A1 (en) * 1981-11-23 1983-06-01 UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" Installation for introducing gas into a bath of liquid metal
BE900114A (en) * 1984-07-06 1984-11-05 Centre Rech Metallurgique Pneumatic refinement of cast iron - blowing through successive groups of tuyeres in converter base
FR2601695A1 (en) * 1986-03-28 1988-01-22 Toshin Steel Co Plug for refining apparatus
EP0329645A1 (en) * 1988-02-19 1989-08-23 Veitscher Magnesitwerke-Actien-Gesellschaft Gas bubbling plug
EP0388255A1 (en) * 1989-03-15 1990-09-19 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Arc furnace and process for smelting scrap
DE4222854A1 (en) * 1992-07-11 1994-01-13 Gutehoffnungshuette Man Base electrode for direct current arc furnaces - with metal rods arranged in hearth base, with non-conducting refractory layers surrounding the rods

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE230090C (en) *
DE898598C (en) * 1943-10-24 1954-01-11 Hoerder Huettenunion Ag Converter bottom and its use for the production of steel by the basic wind-freshening process
DE1029400B (en) * 1951-11-19 1958-05-08 Siderurgie Fse Inst Rech Bessemer or Thomaskonverter with enlarged peripheral blowing surface of the blowing base
EP0080403A1 (en) * 1981-11-23 1983-06-01 UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" Installation for introducing gas into a bath of liquid metal
BE900114A (en) * 1984-07-06 1984-11-05 Centre Rech Metallurgique Pneumatic refinement of cast iron - blowing through successive groups of tuyeres in converter base
FR2601695A1 (en) * 1986-03-28 1988-01-22 Toshin Steel Co Plug for refining apparatus
EP0329645A1 (en) * 1988-02-19 1989-08-23 Veitscher Magnesitwerke-Actien-Gesellschaft Gas bubbling plug
EP0388255A1 (en) * 1989-03-15 1990-09-19 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Arc furnace and process for smelting scrap
DE4222854A1 (en) * 1992-07-11 1994-01-13 Gutehoffnungshuette Man Base electrode for direct current arc furnaces - with metal rods arranged in hearth base, with non-conducting refractory layers surrounding the rods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3517634A4 (en) * 2016-09-19 2020-01-29 Korea Refractories Co., Ltd. Multi-stage porous plug

Also Published As

Publication number Publication date
FR2758486B1 (en) 1999-03-26
BR9800444A (en) 1999-06-01
FR2758486A1 (en) 1998-07-24
CA2227725A1 (en) 1998-07-23

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