EP0333586A1 - Apparatus for removing gaseous and solid impurities from a molten product contained in a vessel - Google Patents

Apparatus for removing gaseous and solid impurities from a molten product contained in a vessel Download PDF

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Publication number
EP0333586A1
EP0333586A1 EP19890400726 EP89400726A EP0333586A1 EP 0333586 A1 EP0333586 A1 EP 0333586A1 EP 19890400726 EP19890400726 EP 19890400726 EP 89400726 A EP89400726 A EP 89400726A EP 0333586 A1 EP0333586 A1 EP 0333586A1
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EP
European Patent Office
Prior art keywords
head
rotor
porous
walls
rotary shaft
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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
Application number
EP19890400726
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German (de)
French (fr)
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EP0333586B1 (en
Inventor
Roland Le Floch
Maurice Oliveira
Nin David Colom
Sylvestre Georges Emile Vire
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Alusuisse Lonza France SA
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Alusuisse France SA
Alusuisse Lonza France SA
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Priority to AT89400726T priority Critical patent/ATE89328T1/en
Publication of EP0333586A1 publication Critical patent/EP0333586A1/en
Application granted granted Critical
Publication of EP0333586B1 publication Critical patent/EP0333586B1/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
    • 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 invention relates to a device for removing impurities present in gaseous and solid form in a liquid product such as liquid metal contained in a tank such as a transport pocket, of the type comprising a rotor which essentially comprises a rotary shaft carrying its free end capable of being immersed in said liquid product, a member forming a stirring head provided with an internal space connected through an axial channel formed in said rotary shaft to a source of an inert gas and communicating with the outside by through passages passing through the walls of said head.
  • the passages through the walls of said head are formed by channels in limited number and opening out at the level of the lateral walls, for example cylindrical of the head.
  • Each of these channels is associated with a channel which opens at one end into the gas passage channel and through the other end to the outside at the level of the lower surface of the head.
  • the member forming the brewing head has a complex structure and to operate efficiently, the rotary speed of the head must be very high. Usually the minimum value is 400 revolutions per minute. Despite this, it turns out that the distribution of the gas in the form of bubbles in the liquid is not sufficiently uniform and the bubbles do not have a sufficiently small size.
  • the object of the present invention is to propose a device which does not have the above-mentioned drawbacks.
  • the device according to the invention is characterized in that the head member is made of a porous material, such as porous graphite, the walls of said head having a porous structure permeable to the gas contained in said cavity inside the head.
  • the head has on its lateral surface a certain number of radial fins, advantageously distributed uniformly around the axis of the head.
  • the envelope in which the radially external surfaces of the fins are inscribed has a frustoconical shape which widens towards the free lower end.
  • Figure 1 there is shown the use of a device 1 according to the invention for removing impurities present in gaseous and solid form, from a liquid metal contained in a transport pocket 2 of this metal. It can be seen that the device has been introduced inside the pocket through an orifice 3 made in the cover of the pocket. At 4 there is shown schematically the closure cap of the orifice 3. The reference 5 designates the level of the liquid metal in the pocket 2.
  • the device 1 according to the invention is formed by a rotor essentially comprising a shaft 7 made of a refractory material such as graphite, which carries at its lower end immersed in the liquid a mixing head 8 and is integral at its upper end with a rotary drive shaft 9.
  • the latter is mounted on a suitable support such as a pivoting frame or arm, of any structure known per se and therefore not shown. Thanks to this support, the device according to the invention is capable of pivoting between a rest position and a position above the tank to be filled, that is to say the bag 2.
  • the device according to the invention formed by the rotor 1 can be introduced into or removed from the pocket 2.
  • the member forming the mixing head 8 of the rotor comprises a substantially cylindrical central part 11, which carries on its external cylindrical surface a number of mixing fins 12 which are distributed regularly around the central part 11
  • the radially outer face 13 of each fin is inclined relative to the axis XX of the rotor, at a predetermined angle ⁇ so that the height a of a fin increases from top to bottom on the head 8.
  • the mixing head 8 has a central chamber 14 which communicates through an axial channel 15 in the rotor shaft 7 with a source of an inert gas such as nitrogen or argon, via an axial channel 16 formed in the rotational drive shaft 9 of the stirring head 8.
  • a source of an inert gas such as nitrogen or argon
  • the latter is made of a porous refractory material, permeable to inert gas, such as for example porous graphite.
  • inert gas such as for example porous graphite.
  • the mixing and gas outlet head 8 of the device according to the invention can be assembled to the rotor 7 in any suitable manner, advantageously by screwing, as in the example shown.
  • the head 8 has above its chamber 14 in communication with the latter a threaded recess 19 into which a threaded axial end piece 20 of the rotor shaft 7 is screwed.
  • the device according to the invention appears from the description of its structure which has just been made.
  • the device in the form of a rotor 1 of the invention is brought by pivoting and then by vertical movement into its working position shown in FIG. 1.
  • the rotor is driven in rotation and the inert gas is sent to the chamber 14 of the head, which allows the formation of very fine bubbles which are distributed regularly in the liquid metal, as has been described above.
  • Due to the porous structure of the head 8 of the rotor it is advantageous to subject the head to a preheating treatment to remove moisture from the pores of the head.
  • a preheating tank, not shown is advantageously used, into which the lower part of the head can be immersed, in its rest position before it is pivoted into the working position.
  • the invention allows the formation of much finer bubbles and a better distribution of these in the liquid.
  • the speed of rotation of the head 8 can be lower in the case of the invention, for example of the order of 200 or even 180 to 300 revolutions per minute, while in known devices , the speed must in principle be greater than 400 rpm. All these features of the invention not only allow a better cleaning effect of the liquid, by stirring and degassing, but also provides a considerable time savings compared to known devices.
  • the relatively low rotation speed of the rotor in the case of the invention, the formation of a vortex in the transport pocket is avoided.
  • An advantage of the taper of the fins lies in the fact that the active porous surface through which bubbles enter the bath and thus the shear surface increasing downward, which acts to compensate for the increase in the pressure in the bath.
  • the invention provides a reduction in gas consumption.
  • the good distribution of fine bubbles in the liquid allows an increase in the volume of the transport bags.
  • the angle of inclination ⁇ of the fins can vary depending on the nature of the liquid to optimize the operation of the device according to the invention.
  • the central part 11 of the stirring and degassing head 8 can have any suitable shape, different from the cylindrical shape shown.
  • the device according to the invention can be used to remove impurities from any product other than liquid metal. It should also be noted that the sending of the inert gas into the head of the rotor can begin before the latter is put into rotation and still take place after it has stopped.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Gas Separation By Absorption (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

Apparatus for removing the impurities present in gaseous and solid form in a liquid product such as liquid metal contained in a conveying ladle. The apparatus is of the type comprising a rotor which essentially includes a rotary shaft (7) carrying at its free end liable to be immersed in the said liquid product a member (8) forming a stirring head, provided with an internal chamber (14) connected through an axial channel (15) made in the said rotary shaft (7) to a source of an inert gas and communicating with the outside by means of passages through the walls of the said head. The apparatus is characterised in that the member forming a head (8) is made of a porous material, such as porous graphite, the walls of the said head exhibiting a porous structure permeable to the gas present in the said chamber (14) inside the head. The invention can be employed for ladles for conveying liquid metals. <IMAGE>

Description

L'invention concerne un dispositif pour éliminer des impuretés présentes sous forme gazeuse et solide dans un produit liquide tel que du métal liquide contenu dans un réservoir tel qu'une poche de transport, du type comprenant un rotor qui comprend essentiellement un arbre rotatif portant à son extrémité libre susceptible d'être immergée dans ledit produit liquide un organe formant tête de brassage pourvu d'un espace interne relié à travers un canal axial pratiqué dans ledit arbre rotatif à une source d'un gaz inerte et communiquant avec l'extérieur par l'intermédiaire de passages traversant les parois de ladite tête.The invention relates to a device for removing impurities present in gaseous and solid form in a liquid product such as liquid metal contained in a tank such as a transport pocket, of the type comprising a rotor which essentially comprises a rotary shaft carrying its free end capable of being immersed in said liquid product, a member forming a stirring head provided with an internal space connected through an axial channel formed in said rotary shaft to a source of an inert gas and communicating with the outside by through passages passing through the walls of said head.

Dans des dispositifs de ce type, qui sont connus, les passages à travers les parois de ladite tête sont formés par des canaux en nombre limité et débouchant à l'extérieur au niveau des parois latérales par exemple cylindriques de la tête. A chaun de ces canaux est associé un canal qui débouche à une extrémité dans le canal de passage de gaz et par l'autre extrémité à l'extérieur au niveau de la surface inférieure de la tête. En état de fonctionnement du dispositif, sous l'effet du mouvement rotatif de la tête et l'écoulement du gaz à travers ces passages vers l'extérieur, le métal liquide est aspiré dans les canaux de gaz et éjecté de ceux-ci sous l'effet de la force centrifuge. On obtient ainsi un brassage du liquide dans le réservoir par la formation de bulles de gaz qui, par effet d'entraînement, provoquent la remontée des impuretés en forme de gaz et de corps solides.In devices of this type, which are known, the passages through the walls of said head are formed by channels in limited number and opening out at the level of the lateral walls, for example cylindrical of the head. Each of these channels is associated with a channel which opens at one end into the gas passage channel and through the other end to the outside at the level of the lower surface of the head. In working condition of the device, under the effect of the rotary movement of the head and the flow of gas through these passages to the outside, the liquid metal is sucked into the gas channels and ejected from them under l effect of centrifugal force. A mixing of the liquid in the reservoir is thus obtained by the formation of gas bubbles which, by entrainment effect, cause the impurities to rise in the form of gas and solid bodies.

Ces dispositifs connus présentent des inconvénients importants. Ainsi, l'organe formant tête de brassage présente une structure complexe et pour fonctionner efficacement, la vitesse rotative de la tête doit avoir une valeur très élevée. Habituellement la valeur minimum est de 400 tours par minute. Malgré cela il s'avère que la répartition du gaz sous forme de bulles dans le liquide n'est pas suffisamment uniforme et les bulles ne présentent pas une taille suffisamment petite.These known devices have significant drawbacks. Thus, the member forming the brewing head has a complex structure and to operate efficiently, the rotary speed of the head must be very high. Usually the minimum value is 400 revolutions per minute. Despite this, it turns out that the distribution of the gas in the form of bubbles in the liquid is not sufficiently uniform and the bubbles do not have a sufficiently small size.

La présente invention a pour but de proposer un dispositif qui ne présente pas les inconvénients susmentionnés.The object of the present invention is to propose a device which does not have the above-mentioned drawbacks.

Pour atteindre ce but, le dispositif selon l'invention est caractérisé en ce que l'organe formant tête est réalisé en un matériau poreux, tel que du graphite poreux, les parois de ladite tête présentant une structure poreuse perméable au gaz contenu dans ladite cavité à l'intérieur de la tête.To achieve this object, the device according to the invention is characterized in that the head member is made of a porous material, such as porous graphite, the walls of said head having a porous structure permeable to the gas contained in said cavity inside the head.

Selon une caractéristique avantageuse de l'invention, la tête présente sur sa surface latérale un certain nombre d'ailettes radiales, avantageusement réparties uniformément autour de l'axe de la tête.According to an advantageous characteristic of the invention, the head has on its lateral surface a certain number of radial fins, advantageously distributed uniformly around the axis of the head.

Selon encore une autre caractéristique de l'invention, l'enveloppe dans laquelle s'inscrivent les surfaces radialement externes des ailettes présente une forme tronconique allant en s'élargissant vers l'extrémité inférieure libre.According to yet another characteristic of the invention, the envelope in which the radially external surfaces of the fins are inscribed has a frustoconical shape which widens towards the free lower end.

L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :

  • La figure 1 est une vue en coupe radiale d'une poche de transport d'un métal liquide dans laquelle est introduit un dispositif selon la présente invention ;
  • La figure 2 est une vue en coupe partielle selon la ligne II-II de la figure 3, de la partie indiquée en II sur la figure 1, à plus grande échelle ; et
  • La figure 3 est une vue en direction de la flèche III de la figure 2.
The invention will be better understood and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a mode of the invention and in which:
  • Figure 1 is a radial sectional view of a liquid metal transport pocket into which is introduced a device according to the present invention;
  • Figure 2 is a partial sectional view along line II-II of Figure 3, of the part indicated in II in Figure 1, on a larger scale; and
  • FIG. 3 is a view in the direction of arrow III in FIG. 2.

A la figure 1, on montre l'utilisation d'un dispositif 1 selon l'invention pour éliminer des impuretés présentes sous forme gazeuse et solide, d'un métal liquide contenu dans une poche de transport 2 de ce métal. On constate que le dispositif a été introduit à l'intérieur de la poche à travers un orifice 3 pratiqué dans le couvercle de la poche. En 4 on a représenté schématiquement le chapeau de fermeture de l'orifice 3. La référence 5 désigne le niveau du métal liquide dans la poche 2.In Figure 1, there is shown the use of a device 1 according to the invention for removing impurities present in gaseous and solid form, from a liquid metal contained in a transport pocket 2 of this metal. It can be seen that the device has been introduced inside the pocket through an orifice 3 made in the cover of the pocket. At 4 there is shown schematically the closure cap of the orifice 3. The reference 5 designates the level of the liquid metal in the pocket 2.

Le dispositif 1 selon l'invention est formé par un rotor comprenant essentiellement un arbre 7 en un matériau réfractaire tel que du graphite, qui porte à son extrémité inférieure plongée dans le liquide une tête de brassage 8 et est solidaire à son extrémité supérieure d'un arbre 9 d'entraînement en rotation. Ce dernier est monté sur un support approprié tel qu'un cadre ou bras pivotant, de toute structure connue en soi et de ce fait non représenté. Grâce à ce support, le dispositif selon l'invention est susceptible de pivoter entre une position de repos et une position au-dessus du réservoir à remplir, c'est-à-dire la poche 2. Par le déplacement vertical, le dispositif selon l'invention formé par le rotor 1 peut être introduit ou extrait de la poche 2.The device 1 according to the invention is formed by a rotor essentially comprising a shaft 7 made of a refractory material such as graphite, which carries at its lower end immersed in the liquid a mixing head 8 and is integral at its upper end with a rotary drive shaft 9. The latter is mounted on a suitable support such as a pivoting frame or arm, of any structure known per se and therefore not shown. Thanks to this support, the device according to the invention is capable of pivoting between a rest position and a position above the tank to be filled, that is to say the bag 2. By the vertical movement, the device according to the invention formed by the rotor 1 can be introduced into or removed from the pocket 2.

Dans l'exemple représenté, comme il ressort notamment des figures 2 et 3, l'organe formant tête de brassage 8 du rotor comprend une partie centrale sensiblement cylindrique 11, qui porte sur sa surface cylindrique externe un certain nombre d'ailettes de brassage 12 qui sont réparties régulièrement autour de la partie centrale 11. La face radialement externe 13 de chaque ailette est inclinée par rapport à l'axe X-X du rotor, selon un angle prédéterminé α de façon que la hauteur a d'une ailette augmente de haut en bas sur la tête 8.In the example shown, as is apparent in particular Figures 2 and 3, the member forming the mixing head 8 of the rotor comprises a substantially cylindrical central part 11, which carries on its external cylindrical surface a number of mixing fins 12 which are distributed regularly around the central part 11 The radially outer face 13 of each fin is inclined relative to the axis XX of the rotor, at a predetermined angle α so that the height a of a fin increases from top to bottom on the head 8.

La tête de brassage 8 présente une chambre centrale 14 qui communique à travers un canal axial 15 dans l'arbre de rotor 7 avec une source d'un gaz inerte tel que de l'azote ou de l'argon, par l'intermédiaire d'un canal axial 16 pratiqué dans l'arbre d'entraînement en rotation 9 de la tête de brassage 8.The mixing head 8 has a central chamber 14 which communicates through an axial channel 15 in the rotor shaft 7 with a source of an inert gas such as nitrogen or argon, via an axial channel 16 formed in the rotational drive shaft 9 of the stirring head 8.

Cette dernière est réalisée en un matériau réfractaire poreux, perméable au gaz inerte, tel que par exemple en graphite poreux. Ainsi le gaz fourni par ladite source et présent dans la chambre 14 peut traverser la paroi de la tête de brassage et parvenir dans le métal liquide qui l'entoure. Grâce à la structure poreuse, le gaz inerte sort de la tête 8 sous forme de très petites bulles qui décollent immédiatement de celle-ci, ce qui évite un regroupement des bulles très fines, c'est-à-dire une formation des bulles plus grandes. La structure poreuse de la tête et les ailettes 8 assurent une répartition excellente de fines bulles dans le bain de métal liquide, ce qui assure un effet optimum d'entraînement des impuretés vers la surface 5 de ce bain.The latter is made of a porous refractory material, permeable to inert gas, such as for example porous graphite. Thus the gas supplied by said source and present in chamber 14 can pass through the wall of the stirring head and reach the liquid metal which surrounds it. Thanks to the porous structure, the inert gas leaves the head 8 in the form of very small bubbles which immediately take off therefrom, which avoids a grouping of very fine bubbles, that is to say a formation of bubbles more great. The porous structure of the head and the fins 8 ensure an excellent distribution of fine bubbles in the liquid metal bath, which ensures an optimum effect of entrainment of impurities towards the surface 5 of this bath.

La tête de brassage et de sortie de gaz 8 du dispositif selon l'invention peut être assemblée au rotor 7 de toute façon appropriée, avantageusement par vissage, comme dans l'exemple représenté. A cette fin, la tête 8 présente au-dessus de sa chambre 14 en communication avec celle-ci un évidement fileté 19 dans lequel on visse un embout axial fileté 20 de l'arbre de rotor 7.The mixing and gas outlet head 8 of the device according to the invention can be assembled to the rotor 7 in any suitable manner, advantageously by screwing, as in the example shown. To this end, the head 8 has above its chamber 14 in communication with the latter a threaded recess 19 into which a threaded axial end piece 20 of the rotor shaft 7 is screwed.

Le fonctionnement du dispositif selon l'invention ressort de la description de sa structure qui vient d'être faite. A l'aide de son support non représenté, le dispositif sous forme de rotor 1 de l'invention est amené par pivotement et ensuite par mouvement vertical dans sa position de travail représentée à la figure 1. Ensuite, le rotor est entraîné en rotation et le gaz inerte est envoyé dans la chambre 14 de la tête, ce qui permet la formation des bulles très fines qui se répartissent régulièrement dans le métal liquide, comme cela a été décrit plus haut. En raison de la structure poreuse de la tête 8 du rotor, il est avantageux de soumettre la tête à un traitement de préchauffage pour chasser l'humidité des pores de la tête. A cette fin, on utilise avantageusement une cuve de préchauffage non représentée, dans laquelle peut être plongée la partie inférieure de la tête, dans sa position de repos avant son pivotement dans la position de travail.The operation of the device according to the invention appears from the description of its structure which has just been made. With the aid of its support, not shown, the device in the form of a rotor 1 of the invention is brought by pivoting and then by vertical movement into its working position shown in FIG. 1. Next, the rotor is driven in rotation and the inert gas is sent to the chamber 14 of the head, which allows the formation of very fine bubbles which are distributed regularly in the liquid metal, as has been described above. Due to the porous structure of the head 8 of the rotor, it is advantageous to subject the head to a preheating treatment to remove moisture from the pores of the head. To this end, a preheating tank, not shown, is advantageously used, into which the lower part of the head can be immersed, in its rest position before it is pivoted into the working position.

Par rapport aux dispositifs connus, on constate notamment que l'invention permet une formation de bulles beaucoup plus fines et une meilleure répartition de celles-ci dans le liquide. Il s'avère en outre que la vitesse de rotation de la tête 8 peut être plus faible dans le cas de l'invention, par exemple de l'ordre de 200 ou même 180 à 300 tours par minute, tandis que dans les dispositifs connus, la vitesse doit être en principe supérieure à 400 tours par minute. Toutes ces particularités de l'invention permettent non seulement un meilleur effet d'épuration du liquide, par brassage et dégazage, mais procure également un gain de temps considérable par rapport aux dispositifs connus. De plus, grâce à la vitesse de rotation relativement faible du rotor, on évite dans le cas de l'invention la formation d'un vortex dans la poche de transport.Compared to known devices, it is noted in particular that the invention allows the formation of much finer bubbles and a better distribution of these in the liquid. It also turns out that the speed of rotation of the head 8 can be lower in the case of the invention, for example of the order of 200 or even 180 to 300 revolutions per minute, while in known devices , the speed must in principle be greater than 400 rpm. All these features of the invention not only allow a better cleaning effect of the liquid, by stirring and degassing, but also provides a considerable time savings compared to known devices. In addition, thanks to the relatively low rotation speed of the rotor, in the case of the invention, the formation of a vortex in the transport pocket is avoided.

Il est à noter que le gaz sort sur toute la surface de la tête, même à travers les ailettes, et c'est le frottement de la tête contre le métal liquide qui cisaille les bulles dès le début de leur formation.It should be noted that the gas exits over the entire surface of the head, even through the fins, and it is the friction of the head against the liquid metal which shears the bubbles from the start of their formation.

Un avantage de la conicité des ailettes réside dans le fait que la surface poreuse active par laquelle des bulles pénètrent dans le bain et ainsi la surface de cisaillement augmentant vers le bas, ce qui agit dans le sens d'une compensation de l'augmentation de la pression dans le bain.An advantage of the taper of the fins lies in the fact that the active porous surface through which bubbles enter the bath and thus the shear surface increasing downward, which acts to compensate for the increase in the pressure in the bath.

Dans la mesure où les bulles sont très fines, l'invention procure une réduction de la consommation de gaz. La bonne répartition des fines bulles dans le liquide permet une augmentation du volume des poches de transport.Insofar as the bubbles are very fine, the invention provides a reduction in gas consumption. The good distribution of fine bubbles in the liquid allows an increase in the volume of the transport bags.

Bien entendu, des multiples modifications peuvent être apportées au dispositif selon l'invention. Ainsi, l'angle d'inclinaison α des ailettes peut varier en fonction de la nature du liquide pour optimaliser le fonctionnement du dispositif selon l'invention. D'autre part, la partie centrale 11 de la tête de brassage et de dégazage 8 peut présenter toute forme appropriée, différente de la forme cylindrique représentée. De plus, il est évident que le dispositif selon l'invention peut être utilisé pour éliminer des impuretés de tout autre produit que de métal liquide. Il est à noter encore que l'envoi du gaz inerte dans la tête du rotor peut débuter avant la mise en rotation de ce dernier et encore avoir lieu après son arrêt.Of course, multiple modifications can be made to the device according to the invention. Thus, the angle of inclination α of the fins can vary depending on the nature of the liquid to optimize the operation of the device according to the invention. On the other hand, the central part 11 of the stirring and degassing head 8 can have any suitable shape, different from the cylindrical shape shown. In addition, it is obvious that the device according to the invention can be used to remove impurities from any product other than liquid metal. It should also be noted that the sending of the inert gas into the head of the rotor can begin before the latter is put into rotation and still take place after it has stopped.

Claims (6)

1. Dispositif pour éliminer des impuretés présentes sous forme gazeuse et solide dans un produit liquide tel que du métal liquide, contenu dans un réservoir tel qu'une poche de transport, du type comprenant un rotor qui comprend essentiellement un arbre rotatif portant à son extrémité libre susceptible d'être immergée dans ledit produit liquide un organe formant tête de brassage pourvu d'une chambre interne reliée à travers un canal axial pratiqué dans ledit arbre rotatif à une source d'un gaz inerte et communiquant avec l'extérieur par l'intermédiaire de passages traversant les parois de ladite tête, caractérisé en ce que l'organe formant tête (8) est réalisé en un matériau poreux, tel que du graphite poreux, les parois de ladite tête présentant une structure poreuse perméable au gaz contenu dans ladite chambre (14) à l'intérieur de la tête.1. Device for removing impurities present in gaseous and solid form in a liquid product such as liquid metal, contained in a tank such as a transport pocket, of the type comprising a rotor which essentially comprises a rotary shaft carrying at its end free capable of being immersed in said liquid product a member forming a brewing head provided with an internal chamber connected through an axial channel formed in said rotary shaft to a source of an inert gas and communicating with the outside by intermediate passages passing through the walls of said head, characterized in that the head member (8) is made of a porous material, such as porous graphite, the walls of said head having a porous structure permeable to the gas contained in said chamber (14) inside the head. 2. Dispositif selon la revendication 1, caractérisé en ce que la tête de rotor (8) porte sur sa surface latérale un certain nombre d'ailettes radiales (12), avantageusement réparties uniformément autour de l'axe de la tête.2. Device according to claim 1, characterized in that the rotor head (8) carries on its lateral surface a number of radial fins (12), advantageously distributed uniformly around the axis of the head. 3. Dispositif selon la revendication 2, caractérisé en ce que les ailettes (12) présentent une hauteur radiale (a) qui augmente de haut en bas sur la tête (8).3. Device according to claim 2, characterized in that the fins (12) have a radial height (a) which increases from top to bottom on the head (8). 4 Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'arbre (7) du rotor et la tête (8) sont assemblés par filetage, le rotor étant avantageusement pourvu d'un embout axial fileté (20) destiné à s'engager dans un orifice fileté (19) de la tête de rotor (8).4 Device according to one of the preceding claims, characterized in that the shaft (7) of the rotor and the head (8) are assembled by thread, the rotor advantageously being provided with a threaded axial end piece (20) intended for s 'Engage in a threaded hole (19) of the rotor head (8). 5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'arbre de rotor (7) est réalisé en un matériau réfractaire tel que du graphite.5. Device according to one of claims above, characterized in that the rotor shaft (7) is made of a refractory material such as graphite. 6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des moyens de préchauffage de la tête de rotor (8), pour châsser l'humidité contenue dans celle-ci, ces moyens étant avantageusement formés par une cuve de chauffage dans laquelle l'extrémité inférieure du rotor (1) peut être plongée.6. Device according to one of the preceding claims, characterized in that it comprises means for preheating the rotor head (8), to remove the moisture contained therein, these means being advantageously formed by a tank in which the lower end of the rotor (1) can be immersed.
EP89400726A 1988-03-15 1989-03-15 Apparatus for removing gaseous and solid impurities from a molten product contained in a vessel Expired - Lifetime EP0333586B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89400726T ATE89328T1 (en) 1988-03-15 1989-03-15 PLANT FOR REMOVING GAS OR SOLID IMPURITIES FROM A LIQUID PRODUCT IN A CONTAINER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803349A FR2628756B1 (en) 1988-03-15 1988-03-15 DEVICE FOR REMOVING IMPURITIES PRESENT IN GASEOUS AND SOLID FORM FROM A LIQUID PRODUCT CONTAINED IN A TANK
FR8803349 1988-03-15

Publications (2)

Publication Number Publication Date
EP0333586A1 true EP0333586A1 (en) 1989-09-20
EP0333586B1 EP0333586B1 (en) 1993-05-12

Family

ID=9364282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400726A Expired - Lifetime EP0333586B1 (en) 1988-03-15 1989-03-15 Apparatus for removing gaseous and solid impurities from a molten product contained in a vessel

Country Status (6)

Country Link
EP (1) EP0333586B1 (en)
AT (1) ATE89328T1 (en)
DE (2) DE68906444D1 (en)
ES (1) ES2011760A4 (en)
FR (1) FR2628756B1 (en)
GR (1) GR890300190T1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408165A1 (en) * 1989-07-10 1991-01-16 The Carborundum Company Dispersing gas into molten metal
FR2669041A1 (en) * 1990-11-09 1992-05-15 Sfrm Process for the treatment of a molten metal and its transfer into a receiving cavity and system for making use of this process
EP0819770A1 (en) * 1996-07-16 1998-01-21 Pechiney Japon Rotary impeller with porous head for dispersing gas treatment of molten metal
FR2763079A1 (en) * 1997-05-07 1998-11-13 Graphitech Rotor and installation for the treatment of a bath of liquid metal
WO2002033137A1 (en) * 2000-10-20 2002-04-25 Pechiney Rhenalu Rotary gas dispersion device for treating a liquid metal bath

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3904180A (en) * 1973-05-18 1975-09-09 Southwire Co Apparatus for fluxing and filtering of molten metal
US3917242A (en) * 1973-05-18 1975-11-04 Southwire Co Apparatus for fluxing and filtering of molten metal
US4047938A (en) * 1974-12-23 1977-09-13 Union Carbide Corporation Process for refining molten metal
US4556419A (en) * 1983-10-21 1985-12-03 Showa Aluminum Corporation Process for treating molten aluminum to remove hydrogen gas and non-metallic inclusions therefrom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3904180A (en) * 1973-05-18 1975-09-09 Southwire Co Apparatus for fluxing and filtering of molten metal
US3917242A (en) * 1973-05-18 1975-11-04 Southwire Co Apparatus for fluxing and filtering of molten metal
US4047938A (en) * 1974-12-23 1977-09-13 Union Carbide Corporation Process for refining molten metal
US4556419A (en) * 1983-10-21 1985-12-03 Showa Aluminum Corporation Process for treating molten aluminum to remove hydrogen gas and non-metallic inclusions therefrom

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408165A1 (en) * 1989-07-10 1991-01-16 The Carborundum Company Dispersing gas into molten metal
FR2669041A1 (en) * 1990-11-09 1992-05-15 Sfrm Process for the treatment of a molten metal and its transfer into a receiving cavity and system for making use of this process
EP0819770A1 (en) * 1996-07-16 1998-01-21 Pechiney Japon Rotary impeller with porous head for dispersing gas treatment of molten metal
AU726658B2 (en) * 1996-07-16 2000-11-16 Pechiney Japon Rotary gas dispersion apparatus for molten metal treatment
FR2763079A1 (en) * 1997-05-07 1998-11-13 Graphitech Rotor and installation for the treatment of a bath of liquid metal
WO2002033137A1 (en) * 2000-10-20 2002-04-25 Pechiney Rhenalu Rotary gas dispersion device for treating a liquid metal bath
FR2815642A1 (en) * 2000-10-20 2002-04-26 Pechiney Rhenalu Rotary injector for injecting gas into a liquid metal with an emission system made from a material wettable and inert with respect to the liquid metal

Also Published As

Publication number Publication date
ATE89328T1 (en) 1993-05-15
GR890300190T1 (en) 1990-10-31
FR2628756B1 (en) 1992-05-22
ES2011760A4 (en) 1990-02-16
DE333586T1 (en) 1990-02-08
DE68906444D1 (en) 1993-06-17
EP0333586B1 (en) 1993-05-12
FR2628756A1 (en) 1989-09-22

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