EP0050578A1 - Apparatus for the treatment of a molten metal bath by gas injection - Google Patents
Apparatus for the treatment of a molten metal bath by gas injection Download PDFInfo
- Publication number
- EP0050578A1 EP0050578A1 EP81420150A EP81420150A EP0050578A1 EP 0050578 A1 EP0050578 A1 EP 0050578A1 EP 81420150 A EP81420150 A EP 81420150A EP 81420150 A EP81420150 A EP 81420150A EP 0050578 A1 EP0050578 A1 EP 0050578A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid metal
- treating
- plug
- metal bath
- agitator
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a device for treating a bath of liquid metal and, in particular, of aluminum or its alloys by gas injection.
- the first consists in passing the liquid metal through inert or active filtration media which retain impurities either mechanically, or following chemical reactions, or by exerting the two effects;
- the second way resorts to the use of inert or reactive gases or their mixtures, which are more or less intensely stirred with the liquid metal, in the presence or not of products such as fluxes.
- gases are injected in the form of small discrete bubbles by means of a device consisting of a rotary shaft secured to a finned rotor, of a fixed sleeve surrounding said shaft and connected at its lower end to a finned stator;
- shaft and sleeve are separated by an axial passage in which the gases are transported and introduced at the level of the fins where they are subdivided into small bubbles and brought into intimate contact with the metal stirred by the rotor.
- This device for treating a bath of liquid metal contained in a container by gas injection is characterized in that it comprises a rotary agitator, the lower end of which rests, when stationary, on a gas injection plug. placed at the bottom of the bath and which, under the action of the pressure of the gas emitted by the plug, lifts and, thus supported by a fluid bearing, can, under the effect of an external torque, freely rotate around its axis and let escape by the space which separates it from the cap, a multitude of regularly dispersed gas bubbles.
- the device according to the invention is therefore formed by the combination of two means: a rotary agitator, on the one hand, and a gas injection plug, on the other hand.
- the rotary agitator consists of a massive piece of cylindrical-tapered shape, the upper part of which is provided with a cylindrical opening in which engages the shaft on which an external torque is exerted.
- the lower part of this agitator may have a smooth surface or have several radial notches of increasing depth towards the periphery, so as to facilitate the entrainment of the injection gases.
- These indentations extend for example in length on a third of the diameter of the agitator and can extend on the lateral face forming kinds of helices facing to the right or to the left and whose pitch is more or less depending on the processing conditions.
- the agitator shaft is equipped with an antivortex system placed at the bath-atmosphere interface, so as to limit the movements of the liquid metal which could hinder proper dispersion of the gases.
- the external torque is preferably exerted by a variable speed motor fixed on a support arranged at the top of the container.
- the shaft of this motor is integral with the shaft of the agitator by means of any connection system which allows the agitator to be able to describe a vertical translational movement over a distance of several millimeters.
- the gas injection plug consists of a cylindrical piece, the upper face of which is pierced with holes of small diameter, which can be arranged in crowns and which are connected inside the plug to channels grouping into one channel. central which leads to an expansion chamber supplied with gas by a pipe external to the container.
- the mass of the plug located above the expansion chamber can be produced with a porous material.
- the agitator and the stopper are arranged, with respect to each other, so that the vertical axes of symmetry of each of them are coincident.
- the lower face of the agitator and the upper face of the stopper are adapted to one another so that, at rest, they are in contact with one another and cause an obstruction of the injection orifices of gas.
- This adaptation can be achieved for example by giving said face of the stopper a conical shape and by providing in said face of the stirrer a cavity of similar shape.
- the gas pressure admitted at the level of the plug raises the agitator and produces a fluid bearing so that, when the drive motor is put into service, said agitator can rotate freely without contact with the cap.
- the agitator and the stopper are preferably composed of graphite, but any other material having sufficient resistance to liquid metal is also suitable.
- the gas admitted by the plug is a neutral gas such as argon, nitrogen or a reactive gas such as chlorine or their mixtures, or any other gas capable of treating the metal.
- a neutral gas such as argon, nitrogen or a reactive gas such as chlorine or their mixtures, or any other gas capable of treating the metal.
- Such a device is placed on a container containing the metal bath to be treated. It can be, for example, a pocket through which the metal passes continuously before being cast.
- This container can carry, in a conventional manner, a partition and, then, the device is placed in the upstream compartment.
- the bottom of this pocket can be provided with a filtration bed or not.
- This pocket is equipped with means which make it possible to maintain a neutral atmosphere on the surface of the liquid metal and thus avoid any oxidizing action of the outside air.
- This container can also be provided with heating means intended to maintain the metal in the liquid state.
- Figure 2 shows the arrangement of the notches (5) on the conical surface (4) of the lower part of the agitator.
- the pocket is supplied with liquid metal by the channel (25) and flows towards the bottom of the upstream compartment, then below the partition (19) towards the downstream compartment before leaving the pocket by the channel (27).
- the metal bath delimited by the walls of the pocket and the surface (28) is intimately stirred by the agitator with the formation of a multitude of finely dispersed gas bubbles which escape through the space (29) forming under the gas pressure between the lower part of the agitator and the upper part of the plug.
- the metal to be treated was an aluminum alloy of the 6000 series, which was brought into the liquid state, at a temperature close to 720 ° C., at a flow rate of 5 tonnes per hour in a ladle where the height bath was 80 cm. :
- the plug of the channel type, was supplied with argon at a rate of approximately 2 m3 / h at a pressure between 1.2 and 1.4 bar.
- the agitator was rotating at a speed of 400 rpm.
- the alloy presented 10 bubbles in the vacuum solidification test; after passing through the pocket, the number of bubbles was zero. This shows the effectiveness of the treatment obtained by means of the claimed device.
- the present invention finds its application in the treatment of liquid metals with a gas, and in particular in the treatment of aluminum or its alloys for the elimination of hydrogen and non-metallic impurities.
Abstract
L'invention concerne un dispositif de traitement d'un bain de métal liquide et, notamment, d'aluminium ou de ses alliages par injection de gaz. Ce dispositif est caractérisé en ce qu'il comprend un agitateur rotatif dont l'extrémité inférieure repose, à l'arrêt, sur un bouchon d'injection de gaz placé au fond du bain et qui, sous l'action de la pression du gaz émis par le bouchon, se soulève et ainsi supporté par un palier fluide, peut, sous l'action d'un couple extérieur, tourner librement autour de son axe et laisser échapper, par l'espace qui le sépare du bouchon, une multitude de bulles de gaz régulièrement dispersée. Ce dispositif permet d'assurer un contact intime entre gaz et métal liquide et d'améliorer ainsi l'efficacité du traitement. Il trouve son application dans le traitement des métaux dont on veut éliminer l'hydrogène et des impuretés non métalliques.The invention relates to a device for treating a bath of liquid metal and, in particular, of aluminum or its alloys by gas injection. This device is characterized in that it comprises a rotary agitator the lower end of which rests, when stationary, on a gas injection plug placed at the bottom of the bath and which, under the action of the pressure of the gas emitted by the plug, lifts and thus supported by a fluid bearing, can, under the action of an external couple, freely rotate around its axis and let escape, through the space which separates it from the plug, a multitude of gas bubbles regularly dispersed. This device ensures intimate contact between gas and liquid metal and thus improves the effectiveness of the treatment. It finds its application in the treatment of metals from which we want to remove hydrogen and non-metallic impurities.
Description
La présente invention est relative à un dispositif de traitement d'un bain de métal liquide et, notamment, d'aluminium ou de ses alliages par injection de gaz.The present invention relates to a device for treating a bath of liquid metal and, in particular, of aluminum or its alloys by gas injection.
L'homme de l'art sait qu'avant de procéder à la mise en forme de produits métallurgiques semi finis, il est nécessaire de traiter le métal brut d'élaboration pour le débarrasser des gaz dissous et des impuretés non métalliques qu'il contient et dont la présence nuirait aux propriétés souhaitées et à la facilité de solidification des pièces fabriquées.Those skilled in the art know that before proceeding to the shaping of semi-finished metallurgical products, it is necessary to treat the raw metal for processing in order to rid it of dissolved gases and of the non-metallic impurities which it contains. and the presence of which would adversely affect the desired properties and the ease of solidification of the parts produced.
Deux voies principales de traitement sont connues actuellement : la première consiste à faire passer le métal liquide à travers les milieux de filtration inertes ou actifs qui retiennent les impuretés soit mécaniquement, soit à la suite de réactions chimiques, soit en exerçant les deux effets ; la deuxième voie recourt à l'utilisation de gaz inertes ou réactifs ou de leurs mélanges, lesquels sont brassés plus ou moins intensément avec le métal liquide, en présence ou non de produits tels que des flux. Ces deux voies peuvent, d'ailleurs, être combinées entre elles.Two main ways of treatment are currently known: the first consists in passing the liquid metal through inert or active filtration media which retain impurities either mechanically, or following chemical reactions, or by exerting the two effects; the second way resorts to the use of inert or reactive gases or their mixtures, which are more or less intensely stirred with the liquid metal, in the presence or not of products such as fluxes. These two routes can, moreover, be combined together.
Suivant la deuxième voie, de nombreuses réalisations ont été faites portant, entre autres, sur la manière d'introduire le gaz dans le bain de métal liquide et sur la façon d'obtenir une plus ou moins grande dispersion des gaz dans le métal. C'est ainsi que, dans le brevet français n° 1 555 953, le gaz est amené dans le bain par un plongeur dont la partie inférieure est équipée d'un dispositif rotatif assurant le brassage et la répartition du gaz à travers une grande surface de bain.According to the second path, numerous embodiments have been made relating, inter alia, to the manner of introducing the gas into the bath of liquid metal and to the manner of obtaining a greater or lesser dispersion of the gases in the metal. Thus, in French patent No. 1,555,953, the gas is brought into the bath by a plunger, the lower part of which is equipped with a rotary device ensuring the mixing and distribution of the gas over a large area. of bath.
Dans le brevet français n° 2 063 916, le gaz est insufflé dans le métal fondu au moyen d'une lance à double enveloppe refroidie par eau.In French Patent No. 2,063,916, the gas is blown into the molten metal by means of a water-cooled double jacket lance.
Dans le brevet français n° 2 166 014, on injecte des gaz sous forme de petites bulles discrètes au moyen d'un dispositif constitué d'un arbre rotatif solidaire d'un rotor à ailettes, d'un manchon fixe entourant ledit arbre et relié à son extrémité inférieure à un stator à ailettes ;In French Patent No. 2,166,014, gases are injected in the form of small discrete bubbles by means of a device consisting of a rotary shaft secured to a finned rotor, of a fixed sleeve surrounding said shaft and connected at its lower end to a finned stator;
arbre et manchon sont séparés par un passage axial dans lequel les gaz sont transportés et introduits au niveau des ailettes où ils sont subdivisés en petites bulles et amenés en contact intime avec le métal agité par le rotor.shaft and sleeve are separated by an axial passage in which the gases are transported and introduced at the level of the fins where they are subdivided into small bubbles and brought into intimate contact with the metal stirred by the rotor.
Dans le brevet français n° 2 200 364, le gaz est introduit au centre de rotation d'un agitateur à turbine et mis en contact avec le métal liquide dans des conditions d'agitation évitant toute émulsification.In French Patent No. 2,200,364, the gas is introduced into the center of rotation of a turbine agitator and brought into contact with the liquid metal under stirring conditions avoiding any emulsification.
De nombreuses solutions ont été proposées. Toutefois, chacune d'elles présente des inconvénients. Ainsi, les dispositifs d'injection de gaz, par l'intermédiaire d'un agitateur, recourent à l'utilisation de canaux de distribution de gaz placés au sein dudit agitateur, ce qui en complique la réalisation et conduit à des systèmes fragiles et d'un entretien coûteux ; de plus, ces canaux sont la source de pertes de charge importantes qui limitent la vitesse d'injection de gaz dans le bain. En outre, la vitesse de rotation de tels dispositifs et, par suite, leur pouvoir de dispersion des gaz et d'agitation du bain, est limitée par l'apparition de balourds et de phénomènes d'abrasion. Certes, on peut parer à ces balourds en fixant les arbres des agitateurs par leur extrémité inférieure, mais il est alors nécessaire soit de monter des paliers supports travaillant au contact de métal liquide, à température relativement élevée, soit de prolonger ces arbres en dehors du récipient de métal et de les équiper de joints tournants. Ce sont autant de solutions qui entraînent des difficultés technologiques souvent insurmontables.Many solutions have been proposed. However, each of them has drawbacks. Thus, gas injection devices, by means of an agitator, resort to the use of gas distribution channels placed within said agitator, which complicates the production thereof and leads to fragile and d '' costly maintenance; in addition, these channels are the source of significant pressure drops which limit the speed of gas injection into the bath. In addition, the speed of rotation of such devices and, consequently, their power to disperse gases and agitate the bath, is limited by the appearance of imbalances and abrasion phenomena. Admittedly, these unbalances can be countered by fixing the shafts of the agitators by their lower ends, but it is then necessary either to mount support bearings working in contact with liquid metal, at relatively high temperature, or to extend these shafts outside the metal container and equip them with rotating joints. These are all solutions that lead to often insurmountable technological difficulties.
C'est pourquoi, la demanderesse a cherché et mis au point un dispositif de traitement d'un bain de métal liquide par injection de gaz dans lequel . on supprime l'alimentation en gaz par l'arbre de l'agitateur et toutes les complications de réalisation qui en résultent ; on limite les phénomènes de balourd et d'abrasion et on obtient un effet de laminage et de dispersion des bulles de gaz tel que l'efficacité de traitement du métal s'en trouve sensiblement amélioré.This is why the applicant has sought and developed a device for treating a bath of liquid metal by injecting gas into which. the gas supply by the agitator shaft and all the resulting complications are eliminated; the phenomena of unbalance and abrasion are limited and a rolling and dispersing effect of the gas bubbles is obtained such that the processing efficiency of the metal is significantly improved.
Ce dispositif de traitement d'un bain de métal liquide contenu dans un récipient par injection de gaz est caractérisé en ce qu'il comprend un agitateur rotatif dont l'extrémité inférieure repose, à l'arrêt, sur un bouchon d'injection de gaz placé au fond du bain et qui, sous l'action de la pression du gaz émis par le bouchon, se soulève et, ainsi supporté par un palier fluide, peut, sous l'effet d'un couple extérieur, tourner librement autour de son axe et laisser échapper par l'espace qui le sépare du bouchon, une multitude de bulles de gaz régulièrement dispersées.This device for treating a bath of liquid metal contained in a container by gas injection is characterized in that it comprises a rotary agitator, the lower end of which rests, when stationary, on a gas injection plug. placed at the bottom of the bath and which, under the action of the pressure of the gas emitted by the plug, lifts and, thus supported by a fluid bearing, can, under the effect of an external torque, freely rotate around its axis and let escape by the space which separates it from the cap, a multitude of regularly dispersed gas bubbles.
Le dispositif selon l'invention est donc formé par la combinaison de deux moyens : un agitateur rotatif, d'une part, et un bouchon d'injection de gaz, d'autre part.The device according to the invention is therefore formed by the combination of two means: a rotary agitator, on the one hand, and a gas injection plug, on the other hand.
L'agitateur rotatif est constitué d'une pièce massive de forme cylindro- tronconique dont la partie supérieure est pourvue d'une ouverture cylindrique dans laquelle s'engage l'arbre sur lequel est exercé un couple extérieur. La partie inférieure de cet agitateur peut avoir une surface lisse ou présenter plusieurs échancrures radiales de profondeur croissante vers la périphérie, de manière à faciliter l'entraînement des gaz d'injection. Ces 'échancrures s'étendent par exemple en longueur sur un ' tiers environ du diamètre de l'agitateur et peuvent se prolonger sur la face latérale en formant des sortes d'hélices orientées vers la droite ou vers la gauche et dont le pas est plus ou moins grand suivant les conditions de traitement.The rotary agitator consists of a massive piece of cylindrical-tapered shape, the upper part of which is provided with a cylindrical opening in which engages the shaft on which an external torque is exerted. The lower part of this agitator may have a smooth surface or have several radial notches of increasing depth towards the periphery, so as to facilitate the entrainment of the injection gases. These indentations extend for example in length on a third of the diameter of the agitator and can extend on the lateral face forming kinds of helices facing to the right or to the left and whose pitch is more or less depending on the processing conditions.
L'arbre de l'agitateur est équipé d'un système antivortex placé à l'interface bain-atmosphère, de façon à limiter les déplacements du métal liquide qui pourraient nuire à une dispersion convenable des gaz.The agitator shaft is equipped with an antivortex system placed at the bath-atmosphere interface, so as to limit the movements of the liquid metal which could hinder proper dispersion of the gases.
Le couple extérieur est exercé de préférence par un moteur à vitesse variable fixé sur un support disposé à la partie supérieure du récipient.The external torque is preferably exerted by a variable speed motor fixed on a support arranged at the top of the container.
L'arbre de ce moteur est solidaire de l'arbre de l'agitateur par l'intermédiaire d'un système de liaison quelconque qui permet à l'agitateur de pouvoir décrire un mouvement de translation vertical sur une distance de plusieurs millimètres.The shaft of this motor is integral with the shaft of the agitator by means of any connection system which allows the agitator to be able to describe a vertical translational movement over a distance of several millimeters.
Le bouchon d'injection de gaz est constitué d'une pièce cylindrique dont la face supérieure est percée de trous de petit diamètre, qui peuvent être disposés en couronnes et qui sont reliés à l'intérieur du bouchon à des canaux se regroupant en un canal central qui débouche sur un chambre de détente alimentée en gaz par une tuyauterie extérieure au récipient. Suivant un autre mode de réalisation de l'invention, la masse du bouchon située au-dessus de la chambre d'expansion, peut être réalisée avec un matériau poreux.The gas injection plug consists of a cylindrical piece, the upper face of which is pierced with holes of small diameter, which can be arranged in crowns and which are connected inside the plug to channels grouping into one channel. central which leads to an expansion chamber supplied with gas by a pipe external to the container. According to another embodiment of the invention, the mass of the plug located above the expansion chamber can be produced with a porous material.
L'agitateur et le bouchon sont disposés, l'un par rapport à l'autre, de façon que les axes de symétrie verticaux de chacun d'eux soient confondus.The agitator and the stopper are arranged, with respect to each other, so that the vertical axes of symmetry of each of them are coincident.
La face inférieure de l'agitateur et-3a face supérieure du bouchon sont adaptées l'une à l'autre afin qu'au repos, elles soient en contact l'une avec l'autre et provoquent unè obstruction des orifices d'injection de gaz.The lower face of the agitator and the upper face of the stopper are adapted to one another so that, at rest, they are in contact with one another and cause an obstruction of the injection orifices of gas.
Cette adaptation peut être réalisée par exemple en donnant à ladite face du bouchon une forme conique et en ménageant dans ladite face de l'agitateur une cavité de forme semblable.This adaptation can be achieved for example by giving said face of the stopper a conical shape and by providing in said face of the stirrer a cavity of similar shape.
Lors du fonctionnement du dispositif, la pression de gaz admise au niveau du bouchon soulève l'agitateur et réalise un palier fluide de sorte que, lorsque le moteur d'entraînement est mis en service, ledit agitateur peut tourner librement sans contact avec le bouchon.During operation of the device, the gas pressure admitted at the level of the plug raises the agitator and produces a fluid bearing so that, when the drive motor is put into service, said agitator can rotate freely without contact with the cap.
On peut ainsi obtenir de grandes vitesses de rotation sans risque d'usure du palier ; de plus, l'adaptation réalisée notamment avec des faces coniques, combinée à l'injection de gaz, assure un centrage de l'agitateur et limite le balourd. Dans ces conditions, on a un dispositif robuste qui assure un brassage intense du bain et un laminage du gaz dans l'espace compris entre le bouchon et l'agitateur, de façon à le laisser s'échapper dans le métal sous la forme d'une multitude de bulles régulièrement dispersées. Il en résulte un contact intime entre gaz et métal et une efficacité de traitement remarquable.It is thus possible to obtain high rotational speeds without risk of wear of the bearing; in addition, the adaptation carried out in particular with conical faces, combined with gas injection, ensures centering of the agitator and limits the unbalance. Under these conditions, there is a robust device which ensures intense mixing of the bath and a rolling of the gas in the space between the plug and the agitator, so as to let it escape into the metal in the form of a multitude of regularly dispersed bubbles. This results in intimate contact between gas and metal and remarkable treatment efficiency.
L'agitateur et le bouchon sont composés, de préférence, de graphite mais, toute autre matière ayant une tenue suffisante au métal liquide convient également.The agitator and the stopper are preferably composed of graphite, but any other material having sufficient resistance to liquid metal is also suitable.
Le gaz admis par le bouchon est un gaz neutre tel que l'argon, l'azote ou un gaz réactif comme le chlore ou leurs mélanges, ou tout autre gaz susceptible de traiter le métal.The gas admitted by the plug is a neutral gas such as argon, nitrogen or a reactive gas such as chlorine or their mixtures, or any other gas capable of treating the metal.
Un tel dispositif est mis en place sur un récipient contenant le bain de métal à traiter. Ce peut être, par exemple, une poche à travers laquelle passe le métal en continu avant d'être coulé. Ce récipient peut conporter, de façon classique, une cloison et, alors, le dispositif est placé dans le compartiment amont. Le fond de cette poche peut être pourvu d'un lit de filtration ou non. Cette poche est équipée de moyens qui permettent de maintenir à la surface du métal liquide une atmpsphère neutre et d'éviter ainsi toute action oxydante de l'air extérieur.Such a device is placed on a container containing the metal bath to be treated. It can be, for example, a pocket through which the metal passes continuously before being cast. This container can carry, in a conventional manner, a partition and, then, the device is placed in the upstream compartment. The bottom of this pocket can be provided with a filtration bed or not. This pocket is equipped with means which make it possible to maintain a neutral atmosphere on the surface of the liquid metal and thus avoid any oxidizing action of the outside air.
Ce récipient peut aussi être pourvu de moyens de chauffage destinés à maintenir le métal à l'état liquide.This container can also be provided with heating means intended to maintain the metal in the liquid state.
La présente invention sera mieux comprise à l'aide des dessins qui accompagnent la demande et qui représentent un type particulier et non limitatif de dispositif.The present invention will be better understood with the aid of the drawings which accompany the application and which represent a particular and non-limiting type of device.
- La figure 1 représente, en coupé verticale, le dispositif agitateur- bouchon.Figure 1 shows, in vertical section, the agitator-stopper device.
- La figure 2 représente une vue de dessous de l'agitateur.Figure 2 shows a bottom view of the agitator.
- La figure 3 représente, en coupe verticale, le dispositif installé sur une poche de coulée en continu.Figure 3 shows, in vertical section, the device installed on a continuous casting ladle.
Sur la figure 1, on distingue :
- - l'agitateur (1) maintenu par un filetage (2) sur l'arbre (3) et dont la partie inférieure présente une surface conique (4) pourvue d'échancrures (5) ;
- - le bouchon d'injection (6) qui a une surface conique vers laquelle aboutissent des canaux (7) issus d'un canal central (8). débouchant d'une chambre de détente (9) alimentée en gaz par une tuyauterie (10). Ce bouchon est inséré dans le revêtement (11) d'une poche de coulée par l'intermédiaire d'un joint isolant (12) et tenu en place par une plaque (13) boulonnée en (14) sur l'armature métallique (15) de la poche.
- - the agitator (1) held by a thread (2) on the shaft (3) and the lower part of which has a conical surface (4) provided with notches (5);
- - the injection plug (6) which has a conical surface towards which lead channels (7) from a central channel (8). emerging from an expansion chamber (9) supplied with gas by a pipe (10). This plug is inserted into the coating (11) of a ladle by means of an insulating seal (12) and held in place by a plate (13) bolted at (14) on the metal frame (15 ) from the pocket.
La figure 2 montre la disposition des échancrures (5) sur la surface conique (4) de la partie inférieure de l'agitateur.Figure 2 shows the arrangement of the notches (5) on the conical surface (4) of the lower part of the agitator.
Sur la figure 3, on voit le dispositif de l'invention équipant une poche de coulée (16) partagée en deux compartiments amont (17) et aval (18) par une cloison (19). Sur un support (20) placé à la partie supérieure de la poche, repose le moteur (21) dont l'arbre de rotation (22) est relié à l'arbre (3) de l'agitateur par un système (23) au moyen duquel l'arbre (3) peut se déplacer verticalement. Cet arbre peut être équipé d'un système antivortex (24).In Figure 3, we see the device of the invention fitted to a pocket casting (16) divided into two upstream (17) and downstream (18) compartments by a partition (19). On a support (20) placed at the upper part of the pocket, rests the motor (21) whose rotation shaft (22) is connected to the agitator shaft (3) by a system (23) at means by which the shaft (3) can move vertically. This tree can be equipped with an antivortex system (24).
La poche est alimentée en métal liquide par le chenal (25) et s'écoule vers le fond du conpartiment amont, puis en-dessous de la cloison (19) vers le compartiment aval avant de quitter la poche par le chenal (27).The pocket is supplied with liquid metal by the channel (25) and flows towards the bottom of the upstream compartment, then below the partition (19) towards the downstream compartment before leaving the pocket by the channel (27).
Au cours de son passage dans le compartiment amont, le bain de métal délimité par les parois de la poche et la surface (28), est brassé intimement par l'agitateur avec formation d'une multitude de bulles de gaz finement dispersées qui s'échappent par l'espace (29) se formant sous la pression des gaz entre la partie inférieure de l'agitateur et la partie supérieure du bouchon.During its passage through the upstream compartment, the metal bath delimited by the walls of the pocket and the surface (28) is intimately stirred by the agitator with the formation of a multitude of finely dispersed gas bubbles which escape through the space (29) forming under the gas pressure between the lower part of the agitator and the upper part of the plug.
La présente invention est illustrée par les résultats obtenus au cours. d'essais mettant en oeuvre le dispositif décrit ci-dessus, ces résultats étant donnés à titre indicatif et ne pouvant en aucune façon limiter la portée de l'invention.The present invention is illustrated by the results obtained in the course. of tests using the device described above, these results being given for information only and cannot in any way limit the scope of the invention.
Le métal à traiter était un alliage d'aluminium de la série 6000, qui a été amené à l'état liquide, à une température voisine de 720° C, suivant un débit de 5 tonnes par heure dans une poche de coulée où la hauteur de bain était de 80 cm. :The metal to be treated was an aluminum alloy of the 6000 series, which was brought into the liquid state, at a temperature close to 720 ° C., at a flow rate of 5 tonnes per hour in a ladle where the height bath was 80 cm. :
Le bouchon, du type à canaux, était alimenté avec de l'argon à raison de 2 m3/h environ sous une pression comprise entre 1,2 et 1,4 bar.The plug, of the channel type, was supplied with argon at a rate of approximately 2 m3 / h at a pressure between 1.2 and 1.4 bar.
L'agitateur tournait à une vitesse de 400 t/minutes.The agitator was rotating at a speed of 400 rpm.
A l'entrée de la poche, l'alliage présentait 10 bulles au test de solidification sous vide ; après passage dans la poche, le nombre de bulles était nul. Ceci montre l'efficacité du traitement obtenu au moyen du dispositif revendiqué.At the entrance of the pocket, the alloy presented 10 bubbles in the vacuum solidification test; after passing through the pocket, the number of bubbles was zero. This shows the effectiveness of the treatment obtained by means of the claimed device.
La présente invention trouve son application dans le traitement des métaux liquides par un gaz, et notamment dans le traitement de l'aluminium ou de ses alliages pour-l'élimination de l'hydrogène et des imou- retés non métalliques.The present invention finds its application in the treatment of liquid metals with a gas, and in particular in the treatment of aluminum or its alloys for the elimination of hydrogen and non-metallic impurities.
Claims (15)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8022193A FR2491954A1 (en) | 1980-10-14 | 1980-10-14 | DEVICE FOR TREATING A LIQUID METAL BATH BY INJECTING GAS |
| FR8022193 | 1980-10-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0050578A1 true EP0050578A1 (en) | 1982-04-28 |
| EP0050578B1 EP0050578B1 (en) | 1984-03-21 |
Family
ID=9246990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81420150A Expired EP0050578B1 (en) | 1980-10-14 | 1981-10-13 | Apparatus for the treatment of a molten metal bath by gas injection |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US4372541A (en) |
| EP (1) | EP0050578B1 (en) |
| JP (1) | JPS5792146A (en) |
| KR (1) | KR830007187A (en) |
| AU (1) | AU540945B2 (en) |
| CA (1) | CA1165117A (en) |
| DE (1) | DE3162821D1 (en) |
| ES (1) | ES506075A0 (en) |
| FR (1) | FR2491954A1 (en) |
| GR (1) | GR75823B (en) |
| IN (1) | IN155192B (en) |
| NO (1) | NO813447L (en) |
| OA (1) | OA06917A (en) |
| RO (1) | RO83654B (en) |
| YU (1) | YU243581A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2562449A1 (en) * | 1984-04-06 | 1985-10-11 | Servimetal | DEVICE FOR TREATING STEEL, BEFORE CONTINUOUS CASTING, BY GAS INJECTION |
| FR2629101A1 (en) * | 1988-03-23 | 1989-09-29 | Radex Heraklin Industriebeteil | BRICK FOR THE INTRODUCTION OF GASES OR REACTION PRODUCTS IN A METALLURGICAL CASTING CONTAINER |
Families Citing this family (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183402B1 (en) * | 1984-11-29 | 1988-08-17 | Foseco International Limited | Rotary device, apparatus and method for treating molten metal |
| AU591889B2 (en) * | 1985-03-26 | 1989-12-21 | British Steel Plc | Improvements in or relating to outlet valves for metal containing vessels |
| US4673434A (en) * | 1985-11-12 | 1987-06-16 | Foseco International Limited | Using a rotary device for treating molten metal |
| AU605949B2 (en) * | 1987-12-25 | 1991-01-24 | Nkk Corporation | Method for cleaning molten metal and apparatus therefor |
| DE3907887A1 (en) * | 1988-03-23 | 1989-10-26 | Radex Heraklith | Bubble brick |
| US4954167A (en) * | 1988-07-22 | 1990-09-04 | Cooper Paul V | Dispersing gas into molten metal |
| US5158737A (en) * | 1991-04-29 | 1992-10-27 | Altec Engineering, Inc. | Apparatus for refining molten aluminum |
| US5660614A (en) * | 1994-02-04 | 1997-08-26 | Alcan International Limited | Gas treatment of molten metals |
| US5678807A (en) * | 1995-06-13 | 1997-10-21 | Cooper; Paul V. | Rotary degasser |
| US5944496A (en) | 1996-12-03 | 1999-08-31 | Cooper; Paul V. | Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection |
| US5951243A (en) * | 1997-07-03 | 1999-09-14 | Cooper; Paul V. | Rotor bearing system for molten metal pumps |
| US6027685A (en) * | 1997-10-15 | 2000-02-22 | Cooper; Paul V. | Flow-directing device for molten metal pump |
| US6056803A (en) * | 1997-12-24 | 2000-05-02 | Alcan International Limited | Injector for gas treatment of molten metals |
| US6093000A (en) | 1998-08-11 | 2000-07-25 | Cooper; Paul V | Molten metal pump with monolithic rotor |
| US6303074B1 (en) | 1999-05-14 | 2001-10-16 | Paul V. Cooper | Mixed flow rotor for molten metal pumping device |
| US6689310B1 (en) | 2000-05-12 | 2004-02-10 | Paul V. Cooper | Molten metal degassing device and impellers therefor |
| US6723276B1 (en) * | 2000-08-28 | 2004-04-20 | Paul V. Cooper | Scrap melter and impeller |
| US20070253807A1 (en) | 2006-04-28 | 2007-11-01 | Cooper Paul V | Gas-transfer foot |
| US7402276B2 (en) * | 2003-07-14 | 2008-07-22 | Cooper Paul V | Pump with rotating inlet |
| US7470392B2 (en) * | 2003-07-14 | 2008-12-30 | Cooper Paul V | Molten metal pump components |
| US7507367B2 (en) * | 2002-07-12 | 2009-03-24 | Cooper Paul V | Protective coatings for molten metal devices |
| US7731891B2 (en) * | 2002-07-12 | 2010-06-08 | Cooper Paul V | Couplings for molten metal devices |
| US20050013715A1 (en) * | 2003-07-14 | 2005-01-20 | Cooper Paul V. | System for releasing gas into molten metal |
| US7906068B2 (en) * | 2003-07-14 | 2011-03-15 | Cooper Paul V | Support post system for molten metal pump |
| JP5099399B2 (en) * | 2005-11-04 | 2012-12-19 | 独立行政法人日本原子力研究開発機構 | Molten metal refining apparatus and molten metal refining method |
| US8366993B2 (en) | 2007-06-21 | 2013-02-05 | Cooper Paul V | System and method for degassing molten metal |
| US9643247B2 (en) | 2007-06-21 | 2017-05-09 | Molten Metal Equipment Innovations, Llc | Molten metal transfer and degassing system |
| US8613884B2 (en) | 2007-06-21 | 2013-12-24 | Paul V. Cooper | Launder transfer insert and system |
| US9156087B2 (en) | 2007-06-21 | 2015-10-13 | Molten Metal Equipment Innovations, Llc | Molten metal transfer system and rotor |
| US9410744B2 (en) | 2010-05-12 | 2016-08-09 | Molten Metal Equipment Innovations, Llc | Vessel transfer insert and system |
| US8337746B2 (en) | 2007-06-21 | 2012-12-25 | Cooper Paul V | Transferring molten metal from one structure to another |
| US9409232B2 (en) | 2007-06-21 | 2016-08-09 | Molten Metal Equipment Innovations, Llc | Molten metal transfer vessel and method of construction |
| US9205490B2 (en) | 2007-06-21 | 2015-12-08 | Molten Metal Equipment Innovations, Llc | Transfer well system and method for making same |
| US8524146B2 (en) | 2009-08-07 | 2013-09-03 | Paul V. Cooper | Rotary degassers and components therefor |
| US8444911B2 (en) | 2009-08-07 | 2013-05-21 | Paul V. Cooper | Shaft and post tensioning device |
| US10428821B2 (en) * | 2009-08-07 | 2019-10-01 | Molten Metal Equipment Innovations, Llc | Quick submergence molten metal pump |
| US8449814B2 (en) * | 2009-08-07 | 2013-05-28 | Paul V. Cooper | Systems and methods for melting scrap metal |
| US8535603B2 (en) | 2009-08-07 | 2013-09-17 | Paul V. Cooper | Rotary degasser and rotor therefor |
| US8714914B2 (en) | 2009-09-08 | 2014-05-06 | Paul V. Cooper | Molten metal pump filter |
| US9108244B2 (en) * | 2009-09-09 | 2015-08-18 | Paul V. Cooper | Immersion heater for molten metal |
| US9903383B2 (en) | 2013-03-13 | 2018-02-27 | Molten Metal Equipment Innovations, Llc | Molten metal rotor with hardened top |
| US9011761B2 (en) | 2013-03-14 | 2015-04-21 | Paul V. Cooper | Ladle with transfer conduit |
| US10052688B2 (en) | 2013-03-15 | 2018-08-21 | Molten Metal Equipment Innovations, Llc | Transfer pump launder system |
| US10465688B2 (en) | 2014-07-02 | 2019-11-05 | Molten Metal Equipment Innovations, Llc | Coupling and rotor shaft for molten metal devices |
| US10947980B2 (en) | 2015-02-02 | 2021-03-16 | Molten Metal Equipment Innovations, Llc | Molten metal rotor with hardened blade tips |
| US10267314B2 (en) | 2016-01-13 | 2019-04-23 | Molten Metal Equipment Innovations, Llc | Tensioned support shaft and other molten metal devices |
| US11149747B2 (en) | 2017-11-17 | 2021-10-19 | Molten Metal Equipment Innovations, Llc | Tensioned support post and other molten metal devices |
| US11358216B2 (en) | 2019-05-17 | 2022-06-14 | Molten Metal Equipment Innovations, Llc | System for melting solid metal |
| US11873845B2 (en) | 2021-05-28 | 2024-01-16 | Molten Metal Equipment Innovations, Llc | Molten metal transfer device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1555953A (en) * | 1967-02-09 | 1969-01-31 | ||
| FR2166014A1 (en) * | 1971-12-27 | 1973-08-10 | Union Carbide Corp | |
| US3767382A (en) * | 1971-11-04 | 1973-10-23 | Aluminum Co Of America | Treatment of molten aluminum with an impeller |
| US3849119A (en) * | 1971-11-04 | 1974-11-19 | Aluminum Co Of America | Treatment of molten aluminum with an impeller |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR90350E (en) * | 1965-10-21 | 1967-11-24 | Air Liquide | Process for treating liquid metals, applicable in particular to the production of nodular cast iron |
| US3651825A (en) * | 1969-10-24 | 1972-03-28 | Francis P Sury | Stopper plug valve for hot metal ladles |
-
1980
- 1980-10-14 FR FR8022193A patent/FR2491954A1/en active Granted
-
1981
- 1981-08-27 IN IN963/CAL/81A patent/IN155192B/en unknown
- 1981-09-21 US US06/303,868 patent/US4372541A/en not_active Expired - Fee Related
- 1981-10-07 ES ES506075A patent/ES506075A0/en active Granted
- 1981-10-08 RO RO105509A patent/RO83654B/en unknown
- 1981-10-08 OA OA57512A patent/OA06917A/en unknown
- 1981-10-09 YU YU02435/81A patent/YU243581A/en unknown
- 1981-10-12 JP JP56162579A patent/JPS5792146A/en active Granted
- 1981-10-13 NO NO813447A patent/NO813447L/en unknown
- 1981-10-13 DE DE8181420150T patent/DE3162821D1/en not_active Expired
- 1981-10-13 EP EP81420150A patent/EP0050578B1/en not_active Expired
- 1981-10-13 KR KR1019810003860A patent/KR830007187A/en unknown
- 1981-10-13 CA CA000387802A patent/CA1165117A/en not_active Expired
- 1981-10-13 GR GR66263A patent/GR75823B/el unknown
- 1981-10-13 AU AU76282/81A patent/AU540945B2/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1555953A (en) * | 1967-02-09 | 1969-01-31 | ||
| US3767382A (en) * | 1971-11-04 | 1973-10-23 | Aluminum Co Of America | Treatment of molten aluminum with an impeller |
| US3849119A (en) * | 1971-11-04 | 1974-11-19 | Aluminum Co Of America | Treatment of molten aluminum with an impeller |
| FR2166014A1 (en) * | 1971-12-27 | 1973-08-10 | Union Carbide Corp |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2562449A1 (en) * | 1984-04-06 | 1985-10-11 | Servimetal | DEVICE FOR TREATING STEEL, BEFORE CONTINUOUS CASTING, BY GAS INJECTION |
| EP0162789A1 (en) * | 1984-04-06 | 1985-11-27 | Servimetal | Installation for the treatment of steel by injection of gas before continuous casting |
| FR2629101A1 (en) * | 1988-03-23 | 1989-09-29 | Radex Heraklin Industriebeteil | BRICK FOR THE INTRODUCTION OF GASES OR REACTION PRODUCTS IN A METALLURGICAL CASTING CONTAINER |
| BE1003020A3 (en) * | 1988-03-23 | 1991-10-29 | Radex Heraklith | BRICK FOR THE INTRODUCTION OF GASES OR REACTION PRODUCTS INTO A CONTAINER FOR METALLURGICAL CASTING. |
Also Published As
| Publication number | Publication date |
|---|---|
| US4372541A (en) | 1983-02-08 |
| ES8207229A1 (en) | 1982-09-01 |
| OA06917A (en) | 1983-05-31 |
| JPS5792146A (en) | 1982-06-08 |
| RO83654A (en) | 1984-03-15 |
| NO813447L (en) | 1982-04-15 |
| AU7628281A (en) | 1982-04-22 |
| RO83654B (en) | 1984-03-30 |
| CA1165117A (en) | 1984-04-10 |
| IN155192B (en) | 1985-01-12 |
| DE3162821D1 (en) | 1984-04-26 |
| KR830007187A (en) | 1983-10-14 |
| YU243581A (en) | 1983-10-31 |
| FR2491954B1 (en) | 1982-10-22 |
| GR75823B (en) | 1984-08-02 |
| EP0050578B1 (en) | 1984-03-21 |
| ES506075A0 (en) | 1982-09-01 |
| FR2491954A1 (en) | 1982-04-16 |
| AU540945B2 (en) | 1984-12-06 |
| JPS6160904B2 (en) | 1986-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0050578B1 (en) | Apparatus for the treatment of a molten metal bath by gas injection | |
| EP0073729B1 (en) | Stirring equipment for the dispersion of gas during the treatment of metal baths | |
| EP0262058B1 (en) | Rotating devices having blades for dissolving alloy elements and for dispersing gas in a bath of aluminium | |
| EP0170600B1 (en) | Chloridizing ladle for aluminium alloys to remove magnesium | |
| EP0392900B2 (en) | Process and apparatus for the treatment of a liquid with a gas | |
| EP1042224B1 (en) | Method and installation for refining silicon | |
| EP0077282B1 (en) | Installation for the continuous treatment of liquid metals or liquid metal alloys in the form of magnesium or aluminium | |
| FR2502997A1 (en) | PROCESS FOR THE PRODUCTION OF LEAD DECOLLETING STEEL BY CONTINUOUS CASTING | |
| FR3073836A1 (en) | METHOD AND DEVICE FOR SUPPLYING LIQUID SILICON BATH TO SOLID SILICON PARTICLES | |
| EP0924305B1 (en) | Metallurgical reactor for treating of molten metal under reduced pressure | |
| EP1324846B1 (en) | Method for preparing nuclear metal or metal alloy particles | |
| FR2547597A1 (en) | METHOD AND APPARATUS FOR THE CONTINUOUS PROCESSING OF FUSION METAL | |
| EP0333586B1 (en) | Apparatus for removing gaseous and solid impurities from a molten product contained in a vessel | |
| CA2023753C (en) | Method for gas treatment of a wide surface aluminium bath maintained in a stable state in the furnace | |
| CH621365A5 (en) | Process for refining magnesium, copper, zinc, tin and lead | |
| EP0457674B1 (en) | Process and apparatus for preparing powder alloys by rapid solidification | |
| BE532248A (en) | ||
| FR2588571A1 (en) | DEVICE AND METHOD FOR LOW PRESSURE CONTINUOUS INJECTION OF A PULVERULENT ADDITIVE IN A MOLTEN METAL CURRENT | |
| BE516469A (en) | ||
| FR2562449A1 (en) | DEVICE FOR TREATING STEEL, BEFORE CONTINUOUS CASTING, BY GAS INJECTION | |
| BE826774A (en) | METHOD AND APPARATUS FOR PROMOTING METALLURGIC REACTIONS IN FUSION METAL. | |
| FR2529230A1 (en) | METHOD AND APPARATUS FOR DEGASSING METAL FUSION BATH AND / OR REMOVING NON-METALLIC IMPURITIES FROM THESE BATHS | |
| BE634801A (en) | ||
| BE887096A (en) | PROCESS FOR THE MANUFACTURE OF METAL GRANULES PRODUCTS OBTAINED AND DEVICE FOR CARRYING OUT SAID METHOD | |
| BE566844A (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): BE CH DE GB IT NL |
|
| 17P | Request for examination filed |
Effective date: 19820512 |
|
| ITF | It: translation for a ep patent filed |
Owner name: ING. A. GIAMBROCONO & C. S.R.L. |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Designated state(s): BE CH DE GB IT LI NL |
|
| REF | Corresponds to: |
Ref document number: 3162821 Country of ref document: DE Date of ref document: 19840426 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19840910 Year of fee payment: 4 Ref country code: CH Payment date: 19840910 Year of fee payment: 4 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19840930 Year of fee payment: 4 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19851031 Year of fee payment: 5 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19861031 Ref country code: CH Effective date: 19861031 Ref country code: BE Effective date: 19861031 |
|
| BERE | Be: lapsed |
Owner name: ALUMINIUM PECHINEY Effective date: 19861031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19870501 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19870701 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19881118 |