EP1532284B1 - Device for injecting a treatment gas into a molten metal - Google Patents

Device for injecting a treatment gas into a molten metal Download PDF

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Publication number
EP1532284B1
EP1532284B1 EP03758283A EP03758283A EP1532284B1 EP 1532284 B1 EP1532284 B1 EP 1532284B1 EP 03758283 A EP03758283 A EP 03758283A EP 03758283 A EP03758283 A EP 03758283A EP 1532284 B1 EP1532284 B1 EP 1532284B1
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EP
European Patent Office
Prior art keywords
rod
injection device
nozzle
tank
orifice
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 - Lifetime
Application number
EP03758283A
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German (de)
French (fr)
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EP1532284A1 (en
Inventor
Robert Paret
Daniel Coudry
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Novelis Inc Canada
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Novelis Inc Canada
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Publication date
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Priority to SI200331726T priority Critical patent/SI1532284T1/en
Publication of EP1532284A1 publication Critical patent/EP1532284A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • 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
    • B22D41/42—Features relating to gas injection
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/064—Obtaining aluminium refining using inert or reactive gases

Definitions

  • the present invention relates, on the one hand, to a device for injecting a treatment gas into a liquid metal contained in a tank, and, on the other hand, to a tank used in metallurgy and comprising at least one such vessel. injection device.
  • the liquid metal may consist in particular of aluminum, an aluminum alloy, magnesium, or a magnesium alloy.
  • the treatment of liquid metal generally aims to rid it of dissolved gases, including hydrogen, but also dissolved impurities, such as alkali metals, and solid or liquid inclusions that could affect the quality of the cast products.
  • this treatment step is carried out by injecting a treatment gas into the liquid metal contained in a tank.
  • the process gas may be an inert gas and insoluble in the liquid metal, such as argon, to a reactive gas such as chlorine, or a mixture thereof.
  • the inert and insoluble gas absorbs the dissolved gas by dilution effect and carries it with it.
  • the reactive gas reacts with certain dissolved impurities and thus generates liquid or solid inclusions which, like those already present in the liquid metal, can be removed by a filtration operation.
  • the patent US 5,846,479 discloses an in-line treatment tank of a liquid metal stream having a plurality of nozzles fixed in a wall of the tank. Part of each nozzle is located outside the vessel and another portion thereof has an end port housed within the vessel. However, this end port has a very fine diameter which is likely to be obstructed by the liquid metal and the metal oxides.
  • SU-A-863,188 discloses a liquid metal ejection nozzle associated with a rod for unclogging this nozzle.
  • US-A-5,667,687 discloses a cyclone provided with an unblocking device, comprising a rod movable relative to a cyclone orifice, in order to remove any solid material present in this orifice.
  • the object of the invention is to provide a device for performing the unclogging of the orifice of each nozzle during the operation of the installation.
  • the invention relates to a device for injecting a treatment gas into a liquid metal contained in a tank, said device being intended to be fixed in one of the walls of the tank and comprising at least one nozzle of injection provided with an end orifice, characterized in that it comprises a movable means operable from the outside of the injection device and able to unclog said end orifice of the nozzle, and in that the moving means comprises a rod slidably mounted inside the nozzle, said rod being able to pass from a rest position, during which it is set back from the end orifice of the nozzle so as to allow the passage of the treatment gas, at an advanced position, in which it may eventually lead to the end port.
  • the treatment gas used is an inert gas or a reactive gas
  • perforating and / or repelling the deposits obstructing the end orifice of the nozzle with the aid of the mobile means that can be operated since outside the tank, continue the liquid metal treatment process without altering the quality of treatment.
  • Said movable means is advantageously adapted to pass through the end orifice, which facilitates the unclogging thereof.
  • the rod has an upstream portion which is, on the one hand, able to pass through one end of the nozzle opposite the end orifice, and on the other hand, equipped with a manual control device.
  • the latter advantageously comprises a handle.
  • the device comprises an elastic element, typically a spring, for maintaining the rod in the rest position.
  • an elastic element typically a spring
  • an automated control member is attached to the rod.
  • This control member may be made for example by means of an operating element acting on the sliding of the rod; such as a pneumatic, electrical or electromechanical element.
  • These automated devices can be controlled by an operator or by a programmable system. It is then advantageous, in the case where several injection devices are provided, to associate one or more operating elements, so as to cause the sliding of the different rods.
  • the nozzle preferably contains at least one means for guiding the rod.
  • This may be constituted by a ring having a central orifice and peripheral orifices. The rod then slides through the central orifice of the ring and the injected gas passes through the peripheral orifices.
  • the diameter of the rod decreases towards the end orifice of the nozzle.
  • the present invention also relates to a tank for treating a liquid metal, such as a tank for treating a flow of liquid metal (called “in-line treatment tank”), characterized in that it comprises at least one less a gas injection device according to the invention.
  • in-line treatment tank a tank for treating a flow of liquid metal
  • it is then advantageous to actuate the latter in a time shift with the aid of an automated control member. This can for example be achieved using a camshaft whose cams are fixed in an angular offset.
  • the invention also relates to the use of the liquid metal processing tank defined above.
  • the liquid metal may be aluminum, an aluminum alloy, magnesium or a magnesium alloy.
  • FIG. figure 1 A tank 1 according to an advantageous embodiment of the invention is shown in FIG. figure 1 .
  • This tank 1 comprises a side wall 2 and a bottom 3 for defining a treatment compartment 4, a cover 5, input means 6 and outlet 7 of the liquid metal, and injection devices 8 of a gas treatment according to the invention.
  • the or each injection device 8 is typically fixed in the side wall 2 of the tank 1 which is constituted by an assembly of layers 9 to 11, the outer layer 9 being made of metal (and is generally called a "box") and the other layers 10 and 11 being made of refractory materials.
  • the figure 2 illustrates more specifically an advantageous embodiment of one of the injection devices 8.
  • the injection device 8 comprises a metal rod 14 slidable in a substantially tubular housing, the latter being also used for the admission of the treatment gas within the treatment compartment 4 of the vessel 1.
  • the injection device 8 is broken down, on the one hand, into an upstream part 15 situated outside the tank 1, this upstream part 15 being fixed at one of its ends in a connecting element 16 hollow which is in free communication with a treatment gas tank (not shown), and secondly, in a downstream portion 17 comprising a nozzle 18, fixed in the connecting element 16.
  • the nozzle 18 has an orifice end 19 located inside the treatment compartment 4 of the tank 1.
  • the rod 14 has a first end, located outside the tank 1 and the injection device 8, to which is attached a handle 20, and a second end housed in the vessel 1. Except an annular shoulder 21 secured to the rod 14 in the vicinity of its first end, the rod 14 has a diameter that decreases typically non-uniformly towards its second end. A spring 22, introduced by the second end of the rod 14, is placed around it and has a diameter slightly smaller than that of the shoulder 21.
  • the upstream portion 15 is made from a substantially tubular body 24 having an upstream end, a central channel, and a downstream end. At the upstream end, the diameter of the central channel is substantially equal to that presented by the protrusion 21 of the rod 14.
  • a first seal 25 is fixed in the body 24 and is intended to cooperate with the shoulder 21 when the rod 14 is introduced in the central channel.
  • the central channel has an internal shoulder 26 whose diameter is substantially equal to that of the rod 14.
  • a second seal 27 is fixed in this shoulder 26.
  • the sealing means 25, 27 are particularly advantageous when the process gas is reactive.
  • the spring 22 which is not subjected to any stress, is in abutment against the shoulder 21 and the inner shoulder 26.
  • a nut 28 having a central orifice whose diameter is substantially equal to that of the rod 14 and therefore less than that of the shoulder 21, is screwed around the upstream end of the body 24 so as to prohibit the accidental extraction of the rod 14.
  • the connecting member 16 is provided with a central channel in which the rod 14 can slide and a peripheral recess in which can be inserted a pipe 29 from the treatment gas tank.
  • the nozzle 18 of the downstream portion 17 is made more particularly from a metal tube 30 having, on the one hand, a first end fixed in the downstream end of the element link 16, and secondly, a second end which encloses a substantially tubular metal body 31 .
  • This body 31 has a bevelled end which abuts against the upstream end, in the form of a beveled outer shoulder 33 , a nozzle 34 made of refractory material which also has a downstream end ending in the orifice end 19.
  • This nozzle 34 is stabilized with a nut 35 screwed into the body 31 and having a central orifice whose diameter is substantially equal to that of said nozzle 34.
  • the second end of the nozzle 18 is finally inserted in a body 37 of refractory material which has a conical recess and which is fixed in the layer 11 of the side wall 2 of the vessel 1. At rest, the second end of the rod 14 is then set back from the end orifice 19 of the nozzle 34.
  • the injection device 8 is fixedly held by a support made from two metal rods 38, 39 which each have an end secured to a notch of the metal layer 9 of the side wall 2 of the vessel. 1.
  • a plate 40 having a central perforation and two peripheral perforations is slid and then fixed along the two rods 38, 39. The injection device 8 is first slid through the central perforation of the plate 40, and fixed when properly positioned.
  • the process gas used may be an inert and insoluble gas such as argon, a reactive gas such as chlorine, or a mixture thereof.
  • this process gas is introduced into the connecting element 16 and is passed through the downstream part 17 of the injection device 8 . It is finally ejected through the end orifice 19 of the nozzle 34 in the treatment compartment 4 containing the liquid metal.
  • An advantage therefore lies in the fact that it is possible to adjust this automated control member so that the various injection devices 8 are actuated in a time shift.
  • the operation of placing the in-line treatment tank typically comprises connecting it to at least one chute 12 for supplying molten metal and at least one chute 13 for discharging the liquid metal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Coating With Molten Metal (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Gas Separation By Absorption (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Nozzles (AREA)

Abstract

The invention relates to a device ( 8 ) which is used to inject a treatment gas into a molten metal contained in a tank ( 1 ) and which is designed to be fixed in one of the walls of said tank. The inventive device comprises at least one injection nozzle ( 18 ) which is equipped with an end hole ( 19 ). Said device is characterised in that it comprises a mobile means ( 14 ) which can be manoeuvred from outside of the injection device and which is used to unblock the aforementioned end hole of the nozzle.

Description

La présente invention se rapporte, d'une part, à un dispositif d'injection d'un gaz de traitement dans un métal liquide contenu dans une cuve, et d'autre part, à une cuve utilisée en métallurgie et comprenant au moins un tel dispositif d'injection.The present invention relates, on the one hand, to a device for injecting a treatment gas into a liquid metal contained in a tank, and, on the other hand, to a tank used in metallurgy and comprising at least one such vessel. injection device.

Il est connu de traiter un flux de métal liquide avant de le couler sous la forme d'un produit métallurgique, le métal liquide pouvant consister notamment en de l'aluminium, un alliage d'aluminium, du magnésium, ou un alliage de magnésium. Le traitement du métal liquide vise généralement à le débarrasser des gaz dissous, notamment l'hydrogène, mais aussi des impuretés dissoutes, comme les métaux alcalins, et des inclusions solides ou liquides qui pourraient nuire à la qualité des produits coulés.It is known to treat a flow of liquid metal before casting it in the form of a metallurgical product, the liquid metal may consist in particular of aluminum, an aluminum alloy, magnesium, or a magnesium alloy. The treatment of liquid metal generally aims to rid it of dissolved gases, including hydrogen, but also dissolved impurities, such as alkali metals, and solid or liquid inclusions that could affect the quality of the cast products.

De façon classique, cette étape de traitement est réalisée par injection d'un gaz de traitement au sein du métal liquide contenu dans une cuve. Le gaz de traitement peut consister en un gaz inerte et insoluble dans le métal liquide, tel que l'argon, en un gaz réactif comme le chlore, ou encore en un mélange de ceux-ci.In a conventional manner, this treatment step is carried out by injecting a treatment gas into the liquid metal contained in a tank. The process gas may be an inert gas and insoluble in the liquid metal, such as argon, to a reactive gas such as chlorine, or a mixture thereof.

Le gaz inerte et insoluble absorbe le gaz dissous par effet de dilution et l'emporte avec lui. Le gaz réactif réagit avec certaines impuretés dissoutes et génère ainsi des inclusions liquides ou solides qui, comme celles déjà présentes dans le métal liquide, peuvent être éliminées par une opération de filtration.The inert and insoluble gas absorbs the dissolved gas by dilution effect and carries it with it. The reactive gas reacts with certain dissolved impurities and thus generates liquid or solid inclusions which, like those already present in the liquid metal, can be removed by a filtration operation.

Le brevet US 5,846,479 décrit une cuve de traitement en ligne d'un flux de métal liquide comportant une pluralité de buses fixées dans une paroi de la cuve. Une partie de chaque buse est située à l'extérieur de la cuve et une autre partie de celle-ci comporte un orifice d'extrémité logé à l'intérieur de la cuve. Cependant, cet orifice d'extrémité possède un diamètre très fin qui est susceptible d'être obstrué par le métal liquide et les oxydes de métal.The patent US 5,846,479 discloses an in-line treatment tank of a liquid metal stream having a plurality of nozzles fixed in a wall of the tank. Part of each nozzle is located outside the vessel and another portion thereof has an end port housed within the vessel. However, this end port has a very fine diameter which is likely to be obstructed by the liquid metal and the metal oxides.

Le nettoyage de cet orifice peut être effectué après arrêt de l'installation et ouverture de la cuve, à partir de l'intérieur de celle-ci. Ceci constitue néanmoins une opération laborieuse qui se traduit par une perte de temps et par une rupture dans le procédé de traitement.The cleaning of this orifice can be performed after stopping the installation and opening the tank, from inside the latter. This nevertheless constitutes a laborious operation which results in a loss of time and a break in the treatment process.

Par ailleurs, SU-A-863 188 décrit une buse d'éjection de métal liquide associée à une tige permettant de désobstruer cette buse. US-A-5 667 687 divulgue un cyclone pourvu d'un dispositif de déblocage, comprenant une tige mobile par rapport à un orifice du cyclone, afin d'enlever une éventuelle matière solide présente dans cet orifice.Otherwise, SU-A-863,188 discloses a liquid metal ejection nozzle associated with a rod for unclogging this nozzle. US-A-5,667,687 discloses a cyclone provided with an unblocking device, comprising a rod movable relative to a cyclone orifice, in order to remove any solid material present in this orifice.

Le but de l'invention est de fournir un dispositif permettant de réaliser la désobstruction de l'orifice de chaque buse au cours même du fonctionnement de l'installation.The object of the invention is to provide a device for performing the unclogging of the orifice of each nozzle during the operation of the installation.

A cet effet, l'invention concerne un dispositif d'injection d'un gaz de traitement dans un métal liquide contenu dans une cuve, ledit dispositif étant destiné à être fixé dans une des parois de la cuve et comportant au moins une buse d'injection munie d'un orifice d'extrémité, caractérisé en ce qu'il comprend un moyen mobile manoeuvrable depuis l'extérieur du dispositif d'injection et apte à désobstruer ledit orifice d'extrémité de la buse, et en ce que le moyen mobile comporte une tige montée coulissante à l'intérieur de la buse, ladite tige étant apte à passer d'une position de repos, durant laquelle elle est située en retrait de l'orifice d'extrémité de la buse de façon à permettre le passage du gaz de traitement, à une position avancée, dans laquelle elle peut éventuellement déboucher de l'orifice d'extrémité.To this end, the invention relates to a device for injecting a treatment gas into a liquid metal contained in a tank, said device being intended to be fixed in one of the walls of the tank and comprising at least one nozzle of injection provided with an end orifice, characterized in that it comprises a movable means operable from the outside of the injection device and able to unclog said end orifice of the nozzle, and in that the moving means comprises a rod slidably mounted inside the nozzle, said rod being able to pass from a rest position, during which it is set back from the end orifice of the nozzle so as to allow the passage of the treatment gas, at an advanced position, in which it may eventually lead to the end port.

Ainsi, que le gaz de traitement employé soit un gaz inerte ou un gaz réactif, il est alors possible, en perforant et/ou repoussant les dépôts obstruant l'orifice d'extrémité de la buse à l'aide du moyen mobile manoeuvrable depuis l'extérieur de la cuve, de poursuivre le procédé de traitement du métal liquide sans altérer la qualité de traitement.Thus, whether the treatment gas used is an inert gas or a reactive gas, it is then possible, by perforating and / or repelling the deposits obstructing the end orifice of the nozzle with the aid of the mobile means that can be operated since outside the tank, continue the liquid metal treatment process without altering the quality of treatment.

Ledit moyen mobile est avantageusement apte à traverser l'orifice d'extrémité, ce qui permet de faciliter la désobstruction de celui-ci.Said movable means is advantageously adapted to pass through the end orifice, which facilitates the unclogging thereof.

Selon une première variante de réalisation, la tige présente une partie amont qui est, d'une part, apte à traverser avec étanchéité une extrémité de la buse opposée à l'orifice d'extrémité, et d'autre part, équipée d'un organe de commande manuel. Ce dernier comporte avantageusement une poignée.According to a first variant embodiment, the rod has an upstream portion which is, on the one hand, able to pass through one end of the nozzle opposite the end orifice, and on the other hand, equipped with a manual control device. The latter advantageously comprises a handle.

Avantageusement, le dispositif comporte un élément élastique, typiquement un ressort, permettant le maintien de la tige en position de repos.Advantageously, the device comprises an elastic element, typically a spring, for maintaining the rod in the rest position.

Selon une seconde variante de réalisation, un organe de commande automatisé est rattaché à la tige. Cet organe de commande peut être réalisé par exemple à l'aide d'un élément de manoeuvre agissant sur le coulissement de la tige; tel qu'un élément pneumatique, électrique ou électromécanique. Ces organes automatisés peuvent être commandés par un opérateur ou par un système programmable. Il est alors avantageux, dans le cas où plusieurs dispositifs d'injection sont prévus, d'associer un ou plusieurs éléments de manoeuvre, de façon à provoquer le coulissement des différentes tiges.According to a second variant embodiment, an automated control member is attached to the rod. This control member may be made for example by means of an operating element acting on the sliding of the rod; such as a pneumatic, electrical or electromechanical element. These automated devices can be controlled by an operator or by a programmable system. It is then advantageous, in the case where several injection devices are provided, to associate one or more operating elements, so as to cause the sliding of the different rods.

La buse contient de préférence au moins un moyen de guidage de la tige. Celui-ci peut être constitué par une bague présentant un orifice central et des orifices périphériques. La tige coulisse alors à travers l'orifice central de la bague et le gaz injecté passe au travers des orifices périphériques.The nozzle preferably contains at least one means for guiding the rod. This may be constituted by a ring having a central orifice and peripheral orifices. The rod then slides through the central orifice of the ring and the injected gas passes through the peripheral orifices.

Avantageusement, en section, le diamètre de la tige décroît en direction de l'orifice d'extrémité de la buse.Advantageously, in section, the diameter of the rod decreases towards the end orifice of the nozzle.

La présente invention se rapporte également à une cuve de traitement d'un métal liquide, telle qu'une cuve de traitement d'un flux de métal liquide (dénommée "cuve de traitement en ligne"), caractérisée en ce qu'elle comprend au moins un dispositif d'injection de gaz selon l'invention. Dans le cas où une telle cuve comporte plusieurs dispositifs d'injection, il est alors avantageux d'actionner ces derniers selon un décalage temporel à l'aide d'un organe de commande automatisé. Celui-ci peut par exemple être réalisé à l'aide d'un arbre à cames dont les cames sont fixées selon un décalage angulaire.The present invention also relates to a tank for treating a liquid metal, such as a tank for treating a flow of liquid metal (called "in-line treatment tank"), characterized in that it comprises at least one less a gas injection device according to the invention. In the case where such a tank comprises a plurality of injection devices, it is then advantageous to actuate the latter in a time shift with the aid of an automated control member. This can for example be achieved using a camshaft whose cams are fixed in an angular offset.

L'invention concerne, également, l'utilisation de la cuve de traitement d'un métal liquide défini précédemment. Le métal liquide peut-être de l'aluminium, un alliage d'aluminium, du magnésium ou un alliage de magnésium.The invention also relates to the use of the liquid metal processing tank defined above. The liquid metal may be aluminum, an aluminum alloy, magnesium or a magnesium alloy.

L'invention sera mieux comprise à l'aide de la description détaillée ci-dessous et des figures annexées.

  • La figure 1 est une vue en coupe transversale d'une cuve comportant plusieurs dispositifs d'injection selon l'invention.
  • La figure 2 est une vue partielle en coupe de la cuve selon la ligne II-II de la figure 1.
The invention will be better understood with the aid of the detailed description below and the appended figures.
  • The figure 1 is a cross-sectional view of a tank comprising a plurality of injection devices according to the invention.
  • The figure 2 is a partial sectional view of the tank along line II-II of the figure 1 .

Une cuve 1 selon un mode de réalisation avantageux de l'invention est représentée à la figure 1. Cette cuve 1 comprend une paroi latérale 2 et un fond 3 permettant de définir un compartiment de traitement 4, un couvercle 5, des moyens d'entrée 6 et de sortie 7 du métal liquide, et des dispositifs d'injection 8 d'un gaz de traitement selon l'invention.A tank 1 according to an advantageous embodiment of the invention is shown in FIG. figure 1 . This tank 1 comprises a side wall 2 and a bottom 3 for defining a treatment compartment 4, a cover 5, input means 6 and outlet 7 of the liquid metal, and injection devices 8 of a gas treatment according to the invention.

Le ou chaque dispositif d'injection 8 est typiquement fixé dans la paroi latérale 2 de la cuve 1 qui est constituée par un assemblage de couches 9 à 11, la couche 9 extérieure étant réalisée en métal (et est généralement appelée "caisson") et les autres couches 10 et 11 étant réalisées dans des matériaux réfractaires. La couche 10, qui peut être formée de plusieurs couches superposées, a généralement pour fonction d'isoler thermiquement la cuve. La couche 11 est plus spécifiquement apte à résister au métal liquide.The or each injection device 8 is typically fixed in the side wall 2 of the tank 1 which is constituted by an assembly of layers 9 to 11, the outer layer 9 being made of metal (and is generally called a "box") and the other layers 10 and 11 being made of refractory materials. The layer 10, which may be formed of several superposed layers, generally has the function of thermally isolating the tank. Layer 11 is more specifically adapted to resist liquid metal.

La figure 2 illustre plus spécifiquement un mode de réalisation avantageux de l'un des dispositifs d'injection 8. The figure 2 illustrates more specifically an advantageous embodiment of one of the injection devices 8.

Dans ce mode de réalisation, le dispositif d'injection 8 comprend une tige 14 métallique pouvant coulisser dans un logement sensiblement tubulaire, ce dernier étant également utilisé pour l'admission du gaz de traitement au sein du compartiment de traitement 4 de la cuve 1. In this embodiment, the injection device 8 comprises a metal rod 14 slidable in a substantially tubular housing, the latter being also used for the admission of the treatment gas within the treatment compartment 4 of the vessel 1.

Plus précisément, le dispositif d'injection 8 se décompose, d'une part, en une partie amont 15 située à l'extérieur de la cuve 1, cette partie amont 15 étant fixée à l'une de ses extrémités dans un élément de liaison 16 creux qui est en libre communication avec un réservoir de gaz de traitement (non représenté), et d'autre part, en une partie aval 17 comprenant une buse 18, fixée dans l'élément de liaison 16. La buse 18 présente un orifice d'extrémité 19 situé à l'intérieur du compartiment de traitement 4 de la cuve 1. More precisely, the injection device 8 is broken down, on the one hand, into an upstream part 15 situated outside the tank 1, this upstream part 15 being fixed at one of its ends in a connecting element 16 hollow which is in free communication with a treatment gas tank (not shown), and secondly, in a downstream portion 17 comprising a nozzle 18, fixed in the connecting element 16. The nozzle 18 has an orifice end 19 located inside the treatment compartment 4 of the tank 1.

La tige 14 présente une première extrémité, située à l'extérieur de la cuve 1 et du dispositif d'injection 8, à laquelle est rattachée une poignée 20, et une seconde extrémité logée dans la cuve 1. Hormis un épaulement 21 annulaire solidaire de la tige 14 au voisinage de sa première extrémité, la tige 14 possède un diamètre qui décroît typiquement de façon non régulière en direction de sa seconde extrémité. Un ressort 22, introduit par la seconde extrémité de la tige 14, est placé autour de celle-ci et possède un diamètre légèrement inférieur à celui de l'épaulement 21. The rod 14 has a first end, located outside the tank 1 and the injection device 8, to which is attached a handle 20, and a second end housed in the vessel 1. Except an annular shoulder 21 secured to the rod 14 in the vicinity of its first end, the rod 14 has a diameter that decreases typically non-uniformly towards its second end. A spring 22, introduced by the second end of the rod 14, is placed around it and has a diameter slightly smaller than that of the shoulder 21.

La partie amont 15 est réalisée à partir d'un corps 24 sensiblement tubulaire présentant une extrémité amont, un canal central, et une extrémité aval. Au niveau de l'extrémité amont, le diamètre du canal central est sensiblement égal à celui présenté par l'excroissance 21 de la tige 14. Un premier joint d'étanchéité 25 est fixé dans le corps 24 et est destiné à coopérer avec l'épaulement 21 lorsque la tige 14 est introduite dans le canal central. Au niveau de l'extrémité aval, le canal central présente un épaulement interne 26 dont le diamètre est sensiblement égal à celui de la tige 14. Un second joint d'étanchéité 27 est fixé dans cet épaulement 26. Les moyens d'étanchéité 25, 27 sont particulièrement avantageux lorsque le gaz de traitement est réactif.The upstream portion 15 is made from a substantially tubular body 24 having an upstream end, a central channel, and a downstream end. At the upstream end, the diameter of the central channel is substantially equal to that presented by the protrusion 21 of the rod 14. A first seal 25 is fixed in the body 24 and is intended to cooperate with the shoulder 21 when the rod 14 is introduced in the central channel. At the downstream end, the central channel has an internal shoulder 26 whose diameter is substantially equal to that of the rod 14. A second seal 27 is fixed in this shoulder 26. The sealing means 25, 27 are particularly advantageous when the process gas is reactive.

Après introduction de la tige 14, le ressort 22, qui n'est soumis à aucune contrainte, se trouve en appui contre l'épaulement 21 et l'épaulement interne 26. Un écrou 28, possédant un orifice central dont le diamètre est sensiblement égal à celui de la tige 14 et donc inférieur à celui de l'épaulement 21, est vissé autour de l'extrémité amont du corps 24 de façon à interdire l'extraction accidentelle de la tige 14. After introduction of the rod 14, the spring 22, which is not subjected to any stress, is in abutment against the shoulder 21 and the inner shoulder 26. A nut 28, having a central orifice whose diameter is substantially equal to that of the rod 14 and therefore less than that of the shoulder 21, is screwed around the upstream end of the body 24 so as to prohibit the accidental extraction of the rod 14.

L'élément de liaison 16 est doté d'un canal central dans lequel peut coulisser la tige 14 et d'un évidement périphérique dans lequel peut être insérée une conduite 29 provenant du réservoir de gaz de traitement.The connecting member 16 is provided with a central channel in which the rod 14 can slide and a peripheral recess in which can be inserted a pipe 29 from the treatment gas tank.

Dans la forme d'exécution représentée au dessin, la buse 18 de la partie aval 17 est réalisée plus particulièrement à partir d'un tube 30 métallique présentant, d'une part, une première extrémité fixée dans l'extrémité aval de l'élément de liaison 16, et d'autre part, une seconde extrémité qui enserre un corps 31 métallique sensiblement tubulaire.In the embodiment shown in the drawing, the nozzle 18 of the downstream portion 17 is made more particularly from a metal tube 30 having, on the one hand, a first end fixed in the downstream end of the element link 16, and secondly, a second end which encloses a substantially tubular metal body 31 .

Ce corps 31 possède une extrémité biseautée qui vient en appui contre l'extrémité amont, réalisée sous la forme d'un épaulement externe 33 biseauté, d'une busette 34 en matériau réfractaire qui présente par ailleurs une extrémité aval se terminant par l'orifice d'extrémité 19. Cette busette 34 est stabilisée à l'aide d'un écrou 35 vissé dans le corps 31 et présentant un orifice central dont le diamètre est sensiblement égal à celui de ladite busette 34. La seconde extrémité de la buse 18 est finalement insérée dans un corps 37 en matériau réfractaire qui présente un évidement conique et qui est fixé dans la couche 11 de la paroi latérale 2 de la cuve 1. Au repos, la seconde extrémité de la tige 14 est alors située en retrait de l'orifice d'extrémité 19 de la busette 34. This body 31 has a bevelled end which abuts against the upstream end, in the form of a beveled outer shoulder 33 , a nozzle 34 made of refractory material which also has a downstream end ending in the orifice end 19. This nozzle 34 is stabilized with a nut 35 screwed into the body 31 and having a central orifice whose diameter is substantially equal to that of said nozzle 34. The second end of the nozzle 18 is finally inserted in a body 37 of refractory material which has a conical recess and which is fixed in the layer 11 of the side wall 2 of the vessel 1. At rest, the second end of the rod 14 is then set back from the end orifice 19 of the nozzle 34.

Le dispositif d'injection 8 est maintenu fixement à l'aide d'un support réalisé à partir de deux tiges 38, 39 métalliques qui présentent chacune une extrémité solidaire d'une encoche de la couche 9 métallique de la paroi latérale 2 de la cuve 1. Une plaque 40 comportant une perforation centrale et deux perforations périphériques est glissée puis fixée le long des deux tiges 38, 39. Le dispositif d'injection 8 est d'abord glissé à travers la perforation centrale de la plaque 40, puis fixé lorsqu'il est convenablement positionné.The injection device 8 is fixedly held by a support made from two metal rods 38, 39 which each have an end secured to a notch of the metal layer 9 of the side wall 2 of the vessel. 1. A plate 40 having a central perforation and two peripheral perforations is slid and then fixed along the two rods 38, 39. The injection device 8 is first slid through the central perforation of the plate 40, and fixed when properly positioned.

Le gaz de traitement utilisé peut aussi bien consister en un gaz inerte et insoluble comme l'argon, qu'en un gaz réactif tel que le chlore, ou encore en un mélange de ceux-ci.The process gas used may be an inert and insoluble gas such as argon, a reactive gas such as chlorine, or a mixture thereof.

En fonctionnement, ce gaz de traitement est introduit dans l'élément de liaison 16 et est amené à traverser la partie aval 17 du dispositif d'injection 8. Il est finalement éjecté par l'orifice d'extrémité 19 de la busette 34 dans le compartiment de traitement 4 contenant le métal liquide.In operation, this process gas is introduced into the connecting element 16 and is passed through the downstream part 17 of the injection device 8 . It is finally ejected through the end orifice 19 of the nozzle 34 in the treatment compartment 4 containing the liquid metal.

Lorsqu'un manipulateur souhaite ôter les impuretés ayant commencé à obstruer l'orifice d'extrémité 19 de la busette 34, ce manipulateur se saisit de la poignée 20 et provoque le coulissement de la tige 14. Sous l'effet de cette translation, la seconde extrémité de la tige 14 est alors amenée à traverser l'orifice d'extrémité 19 et donc à perforer et/ou repousser les éventuels dépôts résiduels. Lorsque le manipulateur lâche la poignée 20, le ressort 22 se détend entre l'épaulement 21 et l'épaulement interne 26, et la tige 14 revient ainsi dans sa position de repos.When a manipulator wishes to remove the impurities having begun to obstruct the end orifice 19 of the nozzle 34, this manipulator seizes the handle 20 and causes the sliding of the rod 14. Under the effect of this translation, the second end of the rod 14 is then passed through the end port 19 and thus to perforate and / or repel any residual deposits. When the manipulator releases the handle 20, the spring 22 expands between the shoulder 21 and the inner shoulder 26, and the rod 14 thus returns to its rest position.

Il est à noter que la tige 14, au lieu d'être commandée manuellement à l'aide de la poignée 20, peut être actionnée par un organe de commande automatisé (pneumatique, électromécanique ou autre), ce qui évite les interventions d'opérateurs. Un avantage réside alors dans le fait qu'il est possible de régler cet organe de commande automatisé de façon à ce que les différents dispositifs d'injection 8 soient actionnés selon un décalage temporel.It should be noted that the rod 14, instead of being manually controlled using the handle 20, can be actuated by an automated control member (pneumatic, electromechanical or other), which avoids the intervention of operators . An advantage therefore lies in the fact that it is possible to adjust this automated control member so that the various injection devices 8 are actuated in a time shift.

Un métal liquide 41 peut être traité suivant un procédé comprenant typiquement :

  • la mise en place d'une cuve de traitement 1 munie d'au moins un dispositif d'injection 8 selon l'invention,
  • la mise en circulation du métal liquide 41 de manière à former un flux déterminé dudit métal à l'intérieur de la cuve,
  • l'injection d'un gaz de traitement à l'aide du ou des dispositifs d'injection 8,
  • éventuellement, l'activation du moyen 14 pour dégager l'orifice d'extrémité 19 de la, ou de chaque, buse 18.
A liquid metal 41 may be processed in a process typically comprising:
  • the establishment of a treatment tank 1 provided with at least one injection device 8 according to the invention,
  • the circulation of the liquid metal 41 so as to form a determined flow of said metal inside the tank,
  • injecting a treatment gas using the injection device or devices 8,
  • optionally, the activation of the means 14 to disengage the end orifice 19 from the or each nozzle 18.

L'opération de mise en place de la cuve de traitement en ligne comporte typiquement le raccordement de celle-ci à au moins une goulotte 12 d'alimentation en métal liquide et au moins une goulotte 13 d'évacuation du métal liquide.The operation of placing the in-line treatment tank typically comprises connecting it to at least one chute 12 for supplying molten metal and at least one chute 13 for discharging the liquid metal.

Bien que l'invention ait été décrite en liaison avec des exemples particuliers de réalisation, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.Although the invention has been described in connection with particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

Liste des références numériques :

1
Cuve de traitement
2
Paroi latérale de la cuve
3
Fond de la cuve
4
Compartiment de traitement
5
Couvercle
6
Moyens d'entrée du métal liquide
7
Moyens de sortie du métal liquide
8
Dispositif d'injection
9
Couche extérieure
10
Couche réfractaire
11
Couche réfractaire
12
Goulotte d'alimentation
13
Goulotte d'évacuation
14
Tige
15
Partie amont du dispositif d'injection
16
Elément de liaison
17
Partie aval du dispositif d'injection
18
Buse
19
Orifice d'extrémité
20
Organe de commande manuel
21
Epaulement
22
Elément élastique
24
Corps tubulaire
25
Joint d'étanchéité
26
Epaulement interne
27
Joint d'étanchéité
28
Ecrou
29
Conduite
30
Tube métallique
31
Corps métallique
33
Epaulement externe
34
Busette
35
Ecrou
37
Corps en matériau réfractaire
38
Tige métallique
39
Tige métallique
40
Plaque
41
Métal liquide
List of numerical references:
1
Treatment tank
2
Side wall of the tank
3
Bottom of the tank
4
Treatment compartment
5
Lid
6
Means of entry of the liquid metal
7
Means for discharging liquid metal
8
Injection device
9
Outer layer
10
Refractory layer
11
Refractory layer
12
Feed chute
13
Evacuation chute
14
stem
15
Upstream portion of the injection device
16
Connecting element
17
Downstream part of the injection device
18
buzzard
19
End hole
20
Manual control organ
21
shoulder
22
Elastic element
24
Tubular body
25
Seal
26
Internal shoulder
27
Seal
28
Nut
29
Conduct
30
Metal tube
31
Metal body
33
External shoulder
34
nozzle
35
Nut
37
Body made of refractory material
38
Metal rod
39
Metal rod
40
Plate
41
Liquid metal

Claims (13)

  1. Device (8) for injecting a treatment gas into a molten metal contained in a tank (1), said device being designed to be fixed in one of the walls (2) of the tank and comprising at least one injection nozzle (18) provided with an end orifice (19), characterised in that it comprises a mobile means (14) which may be manoeuvred from the outside of the injection device and is capable of unblocking said end orifice of the nozzle, and in that the mobile means comprises a rod (14) slidably mounted inside the nozzle (18), said rod being capable of passing from a resting position, during which it is set back from the end orifice (19) so as to permit the passage of the treatment gas, to an advanced position.
  2. Injection device (8) according to Claim 1, characterised in that the mobile means (14) is capable of passing through the end orifice (19).
  3. Injection device (8) according to Claim 1 or 2, characterised in that, in the advanced position, the rod (14) emerges from the end orifice (19).
  4. Injection device (8) according to one of Claims 1 to 3, characterised in that the rod (14) has an upstream part which, on the one hand, is capable of passing in a sealed manner through one end of the nozzle (18) opposing the end orifice (19) and, on the other hand, is provided with a manual control member (20).
  5. Injection device (8) according to Claim 4, characterised in that the manual control member comprises a handle (20).
  6. Injection device (8) according to any one of Claims 4 or 5, characterised in that it comprises a resilient element (22) making it possible to maintain the rod (14) in the resting position.
  7. Injection device (8) according to one of Claims 1 to 3, characterised in that an automated control member is connected to the rod (14).
  8. Injection device (8) according to any one of Claims 1 to 7, characterised in that the nozzle (18) contains at least one guidance means for the rod (14).
  9. Injection device according to Claim 8, characterised in that the guidance means consists of a ring having a central orifice and peripheral orifices.
  10. Injection device (8) according to any one of Claims 1 to 9, characterised in that, in section, the diameter of the rod (14) decreases in the direction of the end orifice (19) of the nozzle (18).
  11. Treatment tank (1) for a molten metal, characterised in that it comprises at least one gas injection device (8) according to any one of Claims 1 to 10.
  12. Use of the device according to one of Claims 1 to 10 or of the tank according to Claim 11 for the treatment of a flow of molten metal.
  13. Use according to Claim 12, characterised in that the molten metal is aluminium, an aluminium alloy, magnesium or a magnesium alloy.
EP03758283A 2002-08-28 2003-08-27 Device for injecting a treatment gas into a molten metal Expired - Lifetime EP1532284B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331726T SI1532284T1 (en) 2002-08-28 2003-08-27 Device for injecting a treatment gas into a molten metal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0210675A FR2843974B1 (en) 2002-08-28 2002-08-28 DEVICE FOR INJECTING A TREATMENT GAS IN A LIQUID METAL
FR0210675 2002-08-28
PCT/FR2003/002591 WO2004020679A1 (en) 2002-08-28 2003-08-27 Device for injecting a treatment gas into a molten metal

Publications (2)

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EP1532284A1 EP1532284A1 (en) 2005-05-25
EP1532284B1 true EP1532284B1 (en) 2009-11-25

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US (1) US7364690B2 (en)
EP (1) EP1532284B1 (en)
JP (1) JP4594090B2 (en)
AT (1) ATE449873T1 (en)
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BR (1) BR0313807A (en)
CA (1) CA2495766C (en)
DE (1) DE60330249D1 (en)
ES (1) ES2335098T3 (en)
FR (1) FR2843974B1 (en)
MX (1) MXPA05002119A (en)
PL (1) PL198454B1 (en)
PT (1) PT1532284E (en)
RU (1) RU2316605C2 (en)
SI (1) SI1532284T1 (en)
WO (1) WO2004020679A1 (en)

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RU2471874C1 (en) * 2011-12-19 2013-01-10 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" Method of removing titanium from high-chromium melts
CN103966463A (en) * 2013-02-04 2014-08-06 宁夏鹏程致远自动化技术有限公司 Pagoda type Laval blowing nozzle for fan airflow
CN103557709B (en) * 2013-05-02 2016-07-06 莫连云 Furnaceman railcar

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SU863188A1 (en) * 1980-01-16 1981-09-15 Предприятие П/Я Г-4236 Injection nozzle for producing metallic powder

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CA1060647A (en) * 1977-03-10 1979-08-21 Noranda Mines Limited Silencer for use on tuyere punchers
JPS585974B2 (en) * 1979-07-23 1983-02-02 日本鉱業株式会社 Automatic drilling method for converter tuyeres
JPS61177342A (en) * 1985-02-02 1986-08-09 Agency Of Ind Science & Technol Refining method of aluminum
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CA2029680A1 (en) * 1990-11-09 1992-05-10 Francois Tremblay Jet flow device for injecting gas into molten metal
GB9426149D0 (en) * 1994-12-23 1995-02-22 Serck Baker Ltd Deblocking device
JPH0926271A (en) * 1995-07-11 1997-01-28 Sumitomo Metal Mining Co Ltd Punching rod for non-ferrous metal refining horizontal converter
GB9610180D0 (en) * 1996-05-15 1996-07-24 English Christopher J Trough degassing reactor
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SU863188A1 (en) * 1980-01-16 1981-09-15 Предприятие П/Я Г-4236 Injection nozzle for producing metallic powder

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JP2005537389A (en) 2005-12-08
JP4594090B2 (en) 2010-12-08
FR2843974B1 (en) 2005-01-28
BR0313807A (en) 2005-07-12
PT1532284E (en) 2010-01-14
ES2335098T3 (en) 2010-03-22
CA2495766A1 (en) 2004-03-11
PL198454B1 (en) 2008-06-30
AU2003274293B2 (en) 2008-08-14
US20050253315A1 (en) 2005-11-17
MXPA05002119A (en) 2005-06-06
EP1532284A1 (en) 2005-05-25
SI1532284T1 (en) 2010-02-26
ATE449873T1 (en) 2009-12-15
RU2316605C2 (en) 2008-02-10
FR2843974A1 (en) 2004-03-05
DE60330249D1 (en) 2010-01-07
US7364690B2 (en) 2008-04-29
PL374638A1 (en) 2005-10-31
WO2004020679A1 (en) 2004-03-11
CA2495766C (en) 2011-02-01
AU2003274293A1 (en) 2004-03-19
RU2005108599A (en) 2005-10-27

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