EP0232648A1 - Injection lance for a metallurgical vessel and process for its fabrication - Google Patents

Injection lance for a metallurgical vessel and process for its fabrication Download PDF

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Publication number
EP0232648A1
EP0232648A1 EP86402816A EP86402816A EP0232648A1 EP 0232648 A1 EP0232648 A1 EP 0232648A1 EP 86402816 A EP86402816 A EP 86402816A EP 86402816 A EP86402816 A EP 86402816A EP 0232648 A1 EP0232648 A1 EP 0232648A1
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EP
European Patent Office
Prior art keywords
tube
coating
fibers
lance
aluminous
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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.)
Withdrawn
Application number
EP86402816A
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German (de)
French (fr)
Inventor
Jean-Charles Daussan
Gérard Daussan
André Daussan
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Daussan SAS
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Daussan SAS
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Publication date
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Publication of EP0232648A1 publication Critical patent/EP0232648A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances

Definitions

  • the present invention relates to a lance for injecting a gas such as argon or a powder into a metal such as molten steel contained in a metallurgical container such as a ladle.
  • the invention also relates to the method of manufacturing such an injection lance.
  • lances it is known to use lances to be used for the injection of argon in ladles or for the desulfurization of barrel bags also called torpedo bags. Using such lances, the desiliconization and the dephosphorization of the metals in the molten state are also carried out.
  • each lance should last approximately 70 operations.
  • lances consisting of a metal tube with a length of approximately 5 m having a large outside diameter (of the order of sixty mm). This tube is usually coated with an aluminous refractory cement, about 80 mm thick. The entire lance weighs 400 to 500 kilos, which is considerable.
  • injector lance coatings based on chromite and silica agglomerated using mineral binders. These coatings have the disadvantage of bringing an undesirable level of silica and chromium in most steels, of being too expensive and of not resisting the contact with the molten metal long enough.
  • Lances are also known that have a refractory coating applied to them using a plasma torch, as well as lances protected by diffusion of aluminum into their surface. Such lances are expensive, require a very long and very complex manufacturing time. Due to the small thickness of the coating which is of the order of 0.05 to 1 mm, these lances are very fragile: the slightest defect, the slightest crack in the coating causes the lance to melt. These spears are more like delayed fusion spears; they are consumed as they are inserted into the steel bath.
  • the object of the present invention is to remedy the aforementioned drawbacks and to present a disposable injection lance of very simple design, inexpensive, handy, non-polluting for liquid metal and does not not favoring, due to its smaller diameter, the pendulum effect of the assembly by the bubbling produced by the injection.
  • the lance for injecting a gas and / or a powder into a molten metal comprising a tube covered by a coating of refractory material is characterized in that this material is composed of a mixture of particles basic or aluminous refractories, or silico-aluminous coated in a binder, this mixture being sinterable at the temperature of the molten metal.
  • this coating makes it possible to provide the coating with a strong mechanical cohesion, so that this coating resists, without degradation, prolonged contact with the molten metal. Furthermore, thanks to this strong mechanical cohesion and to the thermal insulation imparted to the coating by its porosity, this coating can be relatively thin.
  • the lance according to the invention is both very handy and inexpensive, so that one can easily throw it away after several uses and replace it with a new lance.
  • the inner tube of the lance according to the invention can be made of metal or even of a lighter material such as a fiber-based material, chosen from the following: - cellulose fibers, - synthetic fibers, - carbon fibers, - Kevlar fibers or other synthetic fibers, - mineral, refractory fibers and mixtures of these fibers, such as slag, glass, silico-aluminous rock, aluminous and other fibers refractory.
  • a lighter material such as a fiber-based material, chosen from the following: - cellulose fibers, - synthetic fibers, - carbon fibers, - Kevlar fibers or other synthetic fibers, - mineral, refractory fibers and mixtures of these fibers, such as slag, glass, silico-aluminous rock, aluminous and other fibers refractory.
  • the lance with injection of gas such as argon or powder comprises a tube 1 made of metal or of fibrous material, comprising a threaded nozzle 1a intended to be connected to a pipe connected to a source of gas or powder under pressure.
  • This tube 1 has for example an outside diameter of 30 mm.
  • the metal constituting the tube 1 can be steel or aluminum.
  • This tube 1 can also be made of cellulosic material, for example cardboard or synthetic material, for example polyvinyl chloride or based on carbon fibers, Kevlar or refractory material such as porcelain, agglomerated chamotte, glass like quartz glass. or made up of ceramic fibers, mineral fibers (for example glass wool, rock wool, slag, basalt, kaolin).
  • cellulosic material for example cardboard or synthetic material, for example polyvinyl chloride or based on carbon fibers, Kevlar or refractory material such as porcelain, agglomerated chamotte, glass like quartz glass. or made up of ceramic fibers, mineral fibers (for example glass wool, rock wool, slag, basalt, kaolin).
  • the tube 1 is in its part intended to immerse in the liquid metal, entirely covered by a coating 2 made of a material which is composed of a mixture of refractory particles with a basic character, or aluminous or silico-aluminous coated in an organic or inorganic binder.
  • a coating 2 made of a material which is composed of a mixture of refractory particles with a basic character, or aluminous or silico-aluminous coated in an organic or inorganic binder.
  • the nature, composition and particle size of the mixture of refractory and basic or aluminous or silico-aluminous particles which make up the coating 2 are such that this mixture sintered at the temperature of the molten metal.
  • the weight composition of the coating 2 of the lance according to the invention is given below by way of nonlimiting example.
  • Surfactants wetting or dispersing agents such as, for example, lignosulfonate and / or polyphosphate: 0 to 2%, preferably 1% .
  • Magnesia and / or compound of magnesia oxide with a high magnesium oxide content such as magnesia, chromium magnesia and / or olivine, or aluminous or silico-aluminous such as chamotte and / or silimanite and / or mullite and / or bauxite and / or gibbsite and / or corundum and / or tabular alumina, with a particle size between 0.2 and 5 mm ......... 3 to 96%, preferably 15% .
  • Magnesia and / or magnesia oxide compound with a high magnesium oxide content such as magnesia, magnesium-chromium or aluminous or silico-aluminous such as chamotte and / or silimanite and / or mullite and / or bauxite and / or gibbsite and / or corundum and / or tabular alumina, with a particle size between 0 and 0.2 mm: 30 to 96%, preferably 58.5%.
  • This mixture sintered at around 1000 ° C to 1350 ° C. .
  • Organic fibers such as cellulosic fibers, such as paper, and / or vegetable fibers such as hemp, jute, linen, cotton and / or synthetic, for example Kevlar, polyester, polyamide, carbon: 0 to 3%, preferably 1% and mixtures of these fibers.
  • Fondant such as calcium borate and / or iron oxides and / or sodium compounds: 0 to 20%, preferably 1.5% .
  • Carbon and / or a metal such as Al, Si, Mg and / or their mixtures and combinations, for example CSi: 0 to 10%, preferably 5% .
  • Natural and / or synthetic and / or organic glue for example starch, starch and / or phenol-formaldehyde resin, and / or urea-formaldehyde powder and / or mineral glue such as ethyl and / or sodium silicate and / or magnesium cement (magnesium sulfate and chloride) and / or phosphate binder and / or Portland cement and / or aluminous cement and / or their mixture): 0 to 18%, preferably 5% .
  • Mineral fibers such as for example glass fibers, rock fibers, slag fibers: 0 to 10%, preferably 1% and mixtures of these fibers. .
  • Mineral and / or organic plasticizers such as clay, bentonite, carboxymethylcellulose, molasses, sugar: 0 to 5%, preferably 2.5%
  • the coating 2 has the advantage of being relatively sparse and of being at the same time refractory and thermal insulator.
  • this coating is ensured by the fact that the inorganic particles sinter together at the temperature of the liquid metal. This sintering also creates pores within the coating which give it sufficient thermal insulation to protect the tube 1 against the risks of melting when it is made of metal or of degradation when it is made of another material.
  • the coating 2 can be relatively thin. This thickness will generally not exceed 35 mm in the case of a tube 1 30 mm thick.
  • the lance according to the invention is therefore light and easy to handle, while being inexpensive. It can thus be discarded without inconvenience from a certain number of uses, to be replaced by a new lance.
  • the coating 2 can of course be produced in several successive layers of different types which are more or less sinterable, the main thing being that the outer layer is composed of a sinterable mixture, whether it is of basic or silico-aluminous or aluminous character.
  • the underlying layers which are not intended to be in direct contact with the liquid metal may contain constituents of any kind, that is to say: basic or aluminous or silico-aluminous acid, which may comprise metals and / or metal oxides and / or carbon products instead of being only predominantly basic or aluminous or silico-eliminating or siliceous compounds.
  • the coating 2 can also be made in one piece as shown in Figure 1 or be constituted by several elements assembled to each other, by fitting or screwing, the sealing between these elements being achieved using a cement or refractory putty or any other means of jointing such as washers made of non-combustible material and the like.
  • the adhesion of the coating 2 on the tube 1 can be reinforced by fastening means integral with the tube 1 such as pins, staples, gratings, metal wires welded or stapled to the tube 1.
  • the adhesion of the coating 2 on the tube 1 can also be an adhesion by coating the tube with a tackifying agent such as alkali silicate, cement grout, phosphate solution, mastic, sand with or without resin (the sand can be in itself sinterable or not at the temperatures involved in this case).
  • a tackifying agent such as alkali silicate, cement grout, phosphate solution, mastic, sand with or without resin (the sand can be in itself sinterable or not at the temperatures involved in this case).
  • the end 1b of the tube 1 is completely covered by the coating 2.
  • This part 2a of the coating which covers the end 1b of the tube 1 is crossed by three channels 4 arranged at 120 ° one on the other and transverse to the axis of the tube 1.
  • the number of these channels 4 and their angle to the axis of the tube 1 can vary depending on the pressure of the gas blown into the tube, the flow of this gas and the location occupied by the lance relative to the walls of the metallurgical container containing the liquid metal that is to be treated.
  • the end of the lance can also end along the plane P shown in phantom in Figure 1.
  • the tube 1 opens directly outside the lance. It is however possible to incorporate into the end of this tube 1 a porous plug 5 (shown in dotted lines).
  • Porous plugs can also be incorporated in the channels 4.
  • the threaded end piece 1a of the tube 1 can be connected to an apparatus located above the metallurgical container containing the metal to be treated and capable of moving the lance in an axial and / or lateral translational movement.
  • FIG. 2 differs from that of FIG. 1 in that the end of the lance comprises a removable head 3 screwed or fitted onto the end 1b of the tube, this head 3 comprising channels 4, as in the case of the embodiment according to FIG. 1.
  • the composition of the coating 2 is applied in the form of aqueous mud to a perforated cylinder 6 covered with a fine mesh 7 and a vacuum is created inside the perforated cylinder 6 through the tube 1 for sucking therein the water contained in the mud forming the coating 2.
  • the coating 2 is then hardened in an oven.
  • the coating 2 is made, either in one piece, or in several elements, the ends of which preferably form a sealed assembly of the "tenon and mortise" type.
  • the tube 1 is initially retracted from the perforated cylinder 6, as indicated in FIG. 3. At the end of the operation, the tube 1 is pushed into the perforated cylinder 6.
  • the tube 1 is made integral with the perforated cylinder 6 by means additional latching 8, 9 or others such as means cooperating by screwing.
  • the latter is provided with bolts 10 passing through the coating 2 and the perforated cylinder 6 which seal the lateral channels when the interior of the perforated cylinder 7 is evacuated.
  • the tube 1 is provided with lateral tubes intended to come opposite the bolts 10 when the tube 1 is pressed into the perforated cylinder 6. After removal of the bolt 10, the channels formed by these in the coating 2 communicate with inside the tube 1.
  • the coating 2 composed of one or more sleeves, from the perforated cylinder 6 covered with the fine mesh 7; the snap 8 or means cooperating by screwing are embedded in a fixed position, in the mass of the lower end of the covering 2 on which the tube 1 is snapped or screwed in. If there is a clearance between the outer surface of tube 1 and the surface interior of the coating 2, it can be filled, preferably using cement and / or refractory grains.
  • the coating 2 is applied by spraying on a cylindrical tube 11 rotatably mounted on an axis on an apparatus 12 such as a lathe. It is possible to add to it a rotary cylinder to be surfaced (11a) and to provide a mud tank into which the tube 11 at least partially plunges.
  • nozzle 13 Spraying the aqueous mud constituting the coating 2.
  • This nozzle 13 is mounted in translation and in rotation along an axis 14 parallel to the axis of the tube 11.
  • the aqueous mud intended to constitute the coating 2 is introduced by gravity (half view from the right) or by pressure injection (half view from the left) into a mold composed of an external cylinder. 15, consisting of a cylindrical container or two removable half-shells, and an inner tube 1.
  • This tube 1 is lined, for example, externally by a wire 16 wound in a helix which improves the adhesion between the coating 2 and tube 1.
  • the outer cylinder 15 has internally removable bolts 17 at the same time as the two half-shells of this cylinder 15 to form the channels passing through the coating 2 and communicating with the interior of the tube 1.
  • the entire mold is of preferably placed on a vibrating table 18.
  • the removable bolts 17 for forming the channels are provided on the outside of said cylinder.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The lance for injecting a gas and/or a powder into a molten metal comprises a pipe (1) clad with a coating (2) of refractory material. The material forming the coating (2) consists of refractory and basic, either silicoalumina or alumina particles embedded in a binder. These refractory particles can be sintered at the temperature of the molten metal. Use especially for injecting a gas such as argon into the molten steel present in a casting ladle. <IMAGE>

Description

La présente invention concerne une lance pour injecter un gaz tel que de l'argon ou une poudre dans un métal tel que de l'acier en fusion contenu dans un récipient métallurgique tel qu'une poche de coulée.The present invention relates to a lance for injecting a gas such as argon or a powder into a metal such as molten steel contained in a metallurgical container such as a ladle.

L'invention vise également le procédé de fabrication d'une telle lance d'injection.The invention also relates to the method of manufacturing such an injection lance.

Il est connu d'utiliser des lances devant servir à l'injection d'argon dans des poches de coulée ou à la désulfuration de poches tonneaux appelées également poches torpédos. On procède également à l'aide de telles lances à la désiliciation et à la déphosphoration des métaux à l'état fondu.It is known to use lances to be used for the injection of argon in ladles or for the desulfurization of barrel bags also called torpedo bags. Using such lances, the desiliconization and the dephosphorization of the metals in the molten state are also carried out.

On impose actuellement à de telles lances d'atteindre une durée de vie totale correspondant par exemple à plusieurs injections de magnésium au sein d'un bain de 400 tonnes de métal liquide de l'ordre de 280 mn afin de le désulfurer. Ainsi, à raison de 4 min. par injection, chaque lance doit durer environ 70 opérations.It is currently imposed on such lances to reach a total lifetime corresponding for example to several injections of magnesium into a bath of 400 tonnes of liquid metal of the order of 280 min in order to desulfurize it. Thus, at the rate of 4 min. per injection, each lance should last approximately 70 operations.

De telles performances sont atteintes actuellement par des lances constituées d'un tube métallique d'une longueur d'environ 5 m ayant un diamètre extérieur important (de l'ordre d'une soixantaine de mm). Ce tube est habituellement enduit d'un ciment réfractaire alumineux, d'une épaisseur d'environ 80 mm. L'ensemble de la lance pèse de 400 à 500 kilos, ce qui est considérable.Such performances are currently achieved by lances consisting of a metal tube with a length of approximately 5 m having a large outside diameter (of the order of sixty mm). This tube is usually coated with an aluminous refractory cement, about 80 mm thick. The entire lance weighs 400 to 500 kilos, which is considerable.

L'importance des dimensions du tube et du revêtement réfractaire de ces lances connues, est rendu nécessaire pour d'une part atteindre les objectifs précités de durée de vie et d'autre part afin de tenir compte du fait que plus la lance est épaisse, plus son effet de mouvement pendulaire au sein du métal liquide aura de l'ampleur. Ces lances connues, outre le fait qu'elles sont lourdes, sont également onéreuses, difficiles à manier et à réparer.The importance of the dimensions of the tube and of the refractory lining of these known lances is made necessary in order on the one hand to achieve the abovementioned lifetime objectives and on the other hand in order to take into account the fact that the thicker the lance the more its pendulum movement effect within the liquid metal will be amplified. These known lances, in addition to the fact that they are heavy, are also expensive, difficult to handle and to repair.

Il est également connu de revêtir des lances à injection de matériaux compressibles, comportant une forte teneur pondérale en fibres minérales, par exemple de 30 à 60% et une teneur élevée en produits carbonés par exemple de l'ordre de 40 à 70%. Ces revêtements présentent d'une part le désavantage de recarburer le bain de métal liquide et d'autre part de perdre leur cohésion mécanique sous l'effet de la chaleur. Par ailleurs, de tels revêtements ont une résistance à l'érosion très faible et il est pratiquement impossible de les réparer.It is also known to coat injection lances with compressible materials, comprising a high weight content of mineral fibers, for example from 30 to 60% and a high content of carbon products, for example of the order of 40 to 70%. These coatings have on the one hand the disadvantage of recarburizing the bath of liquid metal and on the other hand losing their mechanical cohesion under the effect of heat. Furthermore, such coatings have very low resistance to erosion and it is practically impossible to repair them.

Il a également été préconisé de revêtir les revêtements de lances à injection à l'aide de produits ayant un trop fort pourcentage de silice, par exemple de l'ordre de 80 à 90% en poids, ce qui est à présent proscrit dans toutes les acieries du fait de l'effet néfaste de la silice dans un bain d'acier calmé à aluminium et/ou à haute teneur en manganèse.It has also been recommended to coat the injector lance coatings with products having too high a percentage of silica, for example of the order of 80 to 90% by weight, which is now prohibited in all steelworks due to the harmful effect of silica in a bath of calm steel with aluminum and / or high manganese content.

Il existe également des revêtements de lances à injection à base de chromite et de silice agglomérés à l'aide de liants minéraux. Ces revêtements présentent le désavantage d'amener un taux de silice et de chrome indésirable dans la plupart des aciers, d'être trop onéreux et de ne pas résister suffisamment longtemps au contact du métal liquide.There are also injector lance coatings based on chromite and silica agglomerated using mineral binders. These coatings have the disadvantage of bringing an undesirable level of silica and chromium in most steels, of being too expensive and of not resisting the contact with the molten metal long enough.

On connaît également des lances comportant un revêtement réfractaire appliqué sur celles-ci à l'aide d'un chalumeau à plasma ainsi que des lances protégées par diffusion d'aluminium dans leur surface. De telles lances sont onéreuses, nécessitent un temps de fabrication très long et très complexe. Du fait de la faible épaisseur du revêtement qui est de l'ordre de 0,05 à 1 mm, ces lances sont très fragiles : le moindre défaut, la moindre fissure dans le revêtement entraîne la fusion de la lance. Ces lances sont plutôt des lances à fusion retardée ; elles se consomment au fur et à mesure de leur enfoncement dans le bain d'acier.Lances are also known that have a refractory coating applied to them using a plasma torch, as well as lances protected by diffusion of aluminum into their surface. Such lances are expensive, require a very long and very complex manufacturing time. Due to the small thickness of the coating which is of the order of 0.05 to 1 mm, these lances are very fragile: the slightest defect, the slightest crack in the coating causes the lance to melt. These spears are more like delayed fusion spears; they are consumed as they are inserted into the steel bath.

Le but de la présente invention est de remédier aux inconvénients précités et de présenter une lance à injection jetable de conception très simple, peu onéreuse, maniable, non polluante pour le métal liquide et ne favorisant pas, du fait de son plus faible diamètre, l'effet pendulaire de l'ensemble par le bouillonnement produit par l'injection.The object of the present invention is to remedy the aforementioned drawbacks and to present a disposable injection lance of very simple design, inexpensive, handy, non-polluting for liquid metal and does not not favoring, due to its smaller diameter, the pendulum effect of the assembly by the bubbling produced by the injection.

Suivant l'invention, la lance pour injecter un gaz et/ou une poudre au sein d'un métal en fusion, comprenant un tube recouvert par un revêtement en matière réfractaire est caractérisée en ce que cette matière est composée d'un mélange de particules réfractaires à caractère basique ou alumineux, ou silico-alumineux enrobées dans un liant, ce mélange étant frittable à la température du métal en fusion.According to the invention, the lance for injecting a gas and / or a powder into a molten metal, comprising a tube covered by a coating of refractory material is characterized in that this material is composed of a mixture of particles basic or aluminous refractories, or silico-aluminous coated in a binder, this mixture being sinterable at the temperature of the molten metal.

Le frittage de ce mélange permet d'assurer au revêtement une forte cohésion mécanique, de sorte que ce revêtement résiste sans dégradation à un contact prolongé avec le métal en fusion. Par ailleurs, grâce à cette forte cohésion mécanique et à l'isolation thermique conférée au revêtement par sa porosité, ce revêtement peut être relativement peu épais. Ainsi la lance conforme à l'invention est à la fois très maniable et peu onéreuse, de sorte que l'on peut facilement la jeter après plusieurs utilisations et la remplacer par une lance neuve.The sintering of this mixture makes it possible to provide the coating with a strong mechanical cohesion, so that this coating resists, without degradation, prolonged contact with the molten metal. Furthermore, thanks to this strong mechanical cohesion and to the thermal insulation imparted to the coating by its porosity, this coating can be relatively thin. Thus the lance according to the invention is both very handy and inexpensive, so that one can easily throw it away after several uses and replace it with a new lance.

Par ailleurs, grâce à la nature frittable du mélange à caractère basique ou alumineux ou silico-alumineux du revêtement, on évite d'introduire dans le métal liquide des quantités nuisibles de silice, même si cette dernière est réduite par un métal d'addition tel que Ca-Al.Furthermore, thanks to the sinterable nature of the basic or aluminous or silico-aluminous mixture of the coating, it is avoided to introduce harmful quantities of silica into the liquid metal, even if the latter is reduced by an addition metal such as that Ca-Al.

Le tube intérieur de la lance conforme à l'invention peut être en métal ou même en une matière plus légère telle qu'une matière à base de fibres, choisie parmi les suivantes :
- fibres de cellulose,
- fibres synthétiques,
- fibres de carbone,
- fibres de Kevlar ou autres fibres synthétiques,
- fibres minérales, réfractaires et les mélanges de ces fibres, telles que fibres de laitier, de verre, de roches silico-alumineuses, alumineuses et autres fibres réfractaires.The inner tube of the lance according to the invention can be made of metal or even of a lighter material such as a fiber-based material, chosen from the following:
- cellulose fibers,
- synthetic fibers,
- carbon fibers,
- Kevlar fibers or other synthetic fibers,
- mineral, refractory fibers and mixtures of these fibers, such as slag, glass, silico-aluminous rock, aluminous and other fibers refractory.

D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will appear in the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs :

  • - la figure 1 est une vue en coupe longitudinale avec arrachements d'une lance à injection conforme à l'invention,
  • - la figure 2 est une vue analogue à la figure 1, concernant une variante de réalisation,
  • - la figure 3 est une vue en coupe longitudinale d'une lance conforme à l'invention, illustrant un premier mode de fabrication de celle-ci.
  • - la figure 4 est une vue analogue à la figure 3 illustrant un second mode de fabrication de la lance,
  • - la figure 5 est une vue analogue à la figure 3 illustrant un troisième mode de fabrication de la lance.
In the appended drawings, given by way of nonlimiting examples:
  • FIG. 1 is a view in longitudinal section with cutaway of an injection lance according to the invention,
  • FIG. 2 is a view similar to FIG. 1, concerning an alternative embodiment,
  • - Figure 3 is a longitudinal sectional view of a lance according to the invention, illustrating a first method of manufacturing the latter.
  • FIG. 4 is a view similar to FIG. 3 illustrating a second method of manufacturing the lance,
  • - Figure 5 is a view similar to Figure 3 illustrating a third method of manufacturing the lance.

Dans la réalisation de la figure 1, la lance à injection de gaz tel que l'argon ou de la poudre, comprend un tube 1 en métal ou en matière fibreuse, comportant un embout fileté la destiné à être raccordé à une tuyauterie reliée à une source de gaz ou de poudre sous pression.In the embodiment of FIG. 1, the lance with injection of gas such as argon or powder, comprises a tube 1 made of metal or of fibrous material, comprising a threaded nozzle 1a intended to be connected to a pipe connected to a source of gas or powder under pressure.

Ce tube 1 a par exemple un diamètre extérieur de 30 mm.This tube 1 has for example an outside diameter of 30 mm.

Le métal constituant le tube 1 peut être de l'acier ou de l'aluminium.The metal constituting the tube 1 can be steel or aluminum.

Ce tube 1 peut également être en matière cellulosique, par exemple en carton ou en matière synthétique par exemple en chlorure de polyvinyle ou à base de fibres de carbone, de Kevlar ou en matière réfractaire telle que porcelaine, chamotte agglomérée, verre type verre de quartz ou constitué de fibres céramiques, de fibres minérales (par exemple laine de verre, de roche, de laitier, de basalte, de kaolin).This tube 1 can also be made of cellulosic material, for example cardboard or synthetic material, for example polyvinyl chloride or based on carbon fibers, Kevlar or refractory material such as porcelain, agglomerated chamotte, glass like quartz glass. or made up of ceramic fibers, mineral fibers (for example glass wool, rock wool, slag, basalt, kaolin).

Le tube 1 est dans sa partie destinée à plonger dans le métal liquide, recouvert entièrement par un revêtement 2 réalisé dans une matière qui est composée d'un mélange de particules réfractaires à caractère basique, ou alumineux ou silico-alumineux enrobées dans un liant organique ou inorganique. La nature, la composition et la granulométrie du mélange des particules réfractaires et basiques ou alumineuses ou silico-alumineuses qui composent le revêtement 2 sont telles que ce mélange fritte à la température du métal en fusion.The tube 1 is in its part intended to immerse in the liquid metal, entirely covered by a coating 2 made of a material which is composed of a mixture of refractory particles with a basic character, or aluminous or silico-aluminous coated in an organic or inorganic binder. The nature, composition and particle size of the mixture of refractory and basic or aluminous or silico-aluminous particles which make up the coating 2 are such that this mixture sintered at the temperature of the molten metal.

On donne ci-après à titre d'exemple non limitatif, la composition pondérale du revêtement 2 de la lance conforme à l'invention.
. Tensios-actifs (agents mouillants ou dispersants tels que par exemple du ligno-sulfonate et/ou du polyphosphate : 0 à 2%, de préférence 1%
. Silice colloïdale et/ou cendre de silicium : 0 à 8%, de préférence 0,5%
. Magnésie et/ou composé d'oxyde de magnésie à forte teneur en oxyde de magnésie, tel que magnésie, magnésie chrome et/ou olivine, ou alumineux ou silico-alumineux tels que chamotte et/ou silimanite et/ou mullite et/ou bauxite et/ou gibbsite et/ou corindon et/ou alumine tabulaire, de granulométrie comprise entre 0,2 et 5 mm.............3 à 96%, de préférence 15%
. Magnésie et/ou composé d'oxyde de magnésie à forte teneur en oxyde de magnésie, tel que magnésie, magnésie-­chrome ou alumineux ou silico-alumineux tels que chamotte et/ou silimanite et/ou mullite et/ou bauxite et/ou gibbsite et/ou corindon et/ou alumine tabulaire, de granulométrie comprise entre 0 et 0,2 mm : 30 à 96%, de préférence 58,5%.
Ce mélange fritte aux environs de 1000°C à 1350°C.
. Fibres organiques telles que fibres cellulosiques, telles que papier, et/ou fibres végétales telles que chanvre, jute, lin, coton et/ou synthétique, par exemple Kevlar, polyester, polyamide, carbone : 0 à 3%, de préférence 1% et les mélanges de ces fibres.
. Fondant tel que borate de calcium et/ou oxydes de fer et/ou les composés du sodium : 0 à 20%, de préférence 1,5%
. Acide borique (agent de frittage et agglutinant aux environs de 180°C) ..............0 à 3%, de préférence 2%
. Carbone et/ou un métal tel que Al, Si, Mg et/ou leurs mélanges et combinaisons, par exemple CSi : 0 à 10%, de préférence 5%
. Colle naturelle et/ou synthétique et/ou organique par exemple fécule, amidon et/ou résine phénol-formol, et/ou urée-formol en poudre et/ou colle minérale telle que silicate d'éthyl et/ou de sodium et/ou ciment magnésien (sulfate et chlorure de magnésium) et/ou liant phosphatique et/ou ciment Portland et/ou ciment alumineux et/ou leur mélange) : 0 à 18%, de préférence 5%
. Fibres minérales telles que par exemple fibres de verre, fibres de roche, fibres de laitier : 0 à 10%, de préférence 1% et les mélanges de ces fibres.
. Plastifiants minéraux et/ou organiques tels que argile, bentonite, carboxyméthylcellulose, mélasse, sucre : 0 à 5%, de préférence 2,5%The weight composition of the coating 2 of the lance according to the invention is given below by way of nonlimiting example.
. Surfactants (wetting or dispersing agents such as, for example, lignosulfonate and / or polyphosphate: 0 to 2%, preferably 1%
. Colloidal silica and / or silicon ash: 0 to 8%, preferably 0.5%
. Magnesia and / or compound of magnesia oxide with a high magnesium oxide content, such as magnesia, chromium magnesia and / or olivine, or aluminous or silico-aluminous such as chamotte and / or silimanite and / or mullite and / or bauxite and / or gibbsite and / or corundum and / or tabular alumina, with a particle size between 0.2 and 5 mm ............. 3 to 96%, preferably 15%
. Magnesia and / or magnesia oxide compound with a high magnesium oxide content, such as magnesia, magnesium-chromium or aluminous or silico-aluminous such as chamotte and / or silimanite and / or mullite and / or bauxite and / or gibbsite and / or corundum and / or tabular alumina, with a particle size between 0 and 0.2 mm: 30 to 96%, preferably 58.5%.
This mixture sintered at around 1000 ° C to 1350 ° C.
. Organic fibers such as cellulosic fibers, such as paper, and / or vegetable fibers such as hemp, jute, linen, cotton and / or synthetic, for example Kevlar, polyester, polyamide, carbon: 0 to 3%, preferably 1% and mixtures of these fibers.
. Fondant such as calcium borate and / or iron oxides and / or sodium compounds: 0 to 20%, preferably 1.5%
. Boric acid (sintering agent and agglutinating around 180 ° C) .............. 0 to 3%, preferably 2%
. Carbon and / or a metal such as Al, Si, Mg and / or their mixtures and combinations, for example CSi: 0 to 10%, preferably 5%
. Natural and / or synthetic and / or organic glue, for example starch, starch and / or phenol-formaldehyde resin, and / or urea-formaldehyde powder and / or mineral glue such as ethyl and / or sodium silicate and / or magnesium cement (magnesium sulfate and chloride) and / or phosphate binder and / or Portland cement and / or aluminous cement and / or their mixture): 0 to 18%, preferably 5%
. Mineral fibers such as for example glass fibers, rock fibers, slag fibers: 0 to 10%, preferably 1% and mixtures of these fibers.
. Mineral and / or organic plasticizers such as clay, bentonite, carboxymethylcellulose, molasses, sugar: 0 to 5%, preferably 2.5%

Le revêtement 2 présente l'avantage d'être relativement peu dense et d'être en même temps réfractaire et isolant thermique.The coating 2 has the advantage of being relatively sparse and of being at the same time refractory and thermal insulator.

La cohésion mécanique de ce revêtement est assurée par le fait que les particules inorganiques frittent entre elles à la température du métal liquide. Ce frittage crée également au sein du revêtement des pores qui confèrent à celui-ci une isolation thermique suffisante pour protéger le tube 1 contre les risques de fusion lorsqu'il est en métal ou de dégradation lorsqu'il est dans une autre matière.The mechanical cohesion of this coating is ensured by the fact that the inorganic particles sinter together at the temperature of the liquid metal. This sintering also creates pores within the coating which give it sufficient thermal insulation to protect the tube 1 against the risks of melting when it is made of metal or of degradation when it is made of another material.

Grâce à son excellente tenue thermique et mécanique, le revêtement 2 peut être relativement mince. Cette épaisseur n'excédera généralement pas 35 mm dans le cas d'un tube 1 de 30 mm d'épaisseur. La lance conforme à l'invention est par conséquent légère et aisément manipulable, tout en étant peu onéreuse. Celle-ci peut ainsi être jetée sans inconvénient à partir d'un certain nombre d'utilisations, pour être remplacée par une lance neuve.Thanks to its excellent thermal and mechanical resistance, the coating 2 can be relatively thin. This thickness will generally not exceed 35 mm in the case of a tube 1 30 mm thick. The lance according to the invention is therefore light and easy to handle, while being inexpensive. It can thus be discarded without inconvenience from a certain number of uses, to be replaced by a new lance.

Le revêtement 2 peut bien entendu être réalisé en plusieurs couches successives de natures différentes plus ou moins frittables, l'essentiel étant que la couche extérieure soit composée d'un mélange frittable, qu'il soit à caractère basique ou silico-alumineux ou alumineux. Les couches sous-­jacentes qui ne sont pas destinées à être en contact direct avec le métal liquide peuvent renfermer des constituants de n'importe quelle nature, c'est-à-dire : basique ou acide alumineux ou silico-alumineux, qui peuvent comporter des métaux et/ou des oxydes métalliques et/ou des produits carbonés au lieu d'être uniquement des composés à prédominance basique ou alumineuse ou silico-alimineuse ou siliceuse. Le revêtement 2 peut également être réalisé d'une seule pièce comme indiqué sur la figure 1 ou être constitué par plusieurs éléments assemblés les uns aux autres, par emboîtement ou vissage, l'étanchéité entre ces éléments étant réalisée à l'aide d'un ciment ou d'un mastic réfractaire ou de tout autre moyen de jointoiement tel que des rondelles en matière incombustible et analogue.The coating 2 can of course be produced in several successive layers of different types which are more or less sinterable, the main thing being that the outer layer is composed of a sinterable mixture, whether it is of basic or silico-aluminous or aluminous character. The underlying layers which are not intended to be in direct contact with the liquid metal may contain constituents of any kind, that is to say: basic or aluminous or silico-aluminous acid, which may comprise metals and / or metal oxides and / or carbon products instead of being only predominantly basic or aluminous or silico-eliminating or siliceous compounds. The coating 2 can also be made in one piece as shown in Figure 1 or be constituted by several elements assembled to each other, by fitting or screwing, the sealing between these elements being achieved using a cement or refractory putty or any other means of jointing such as washers made of non-combustible material and the like.

L'adhérence du revêtement 2 sur le tube 1 peut être renforcée par des moyens d'accrochage solidaires du tube 1 tels que picots, agrafes, grillages, fils métalliques soudés ou agrafés au tube 1.The adhesion of the coating 2 on the tube 1 can be reinforced by fastening means integral with the tube 1 such as pins, staples, gratings, metal wires welded or stapled to the tube 1.

L'adhérence du revêtement 2 sur le tube 1 peut également être une adhérence par enduction du tube avec un agent collant tel que silicate d'alcalin, coulis de ciment, solution de phosphate, mastic, sable avec ou sans résine (le sable peut être en lui-même frittable ou non aux températures entrant dans ce cas en jeu). The adhesion of the coating 2 on the tube 1 can also be an adhesion by coating the tube with a tackifying agent such as alkali silicate, cement grout, phosphate solution, mastic, sand with or without resin (the sand can be in itself sinterable or not at the temperatures involved in this case).

Dans la réalisation de la figure 1, l'extrémité 1b du tube 1 est entièrement recouverte par le revêtement 2. Cette partie 2a du revêtement qui recouvre l'extrémité 1b du tube 1 est traversée par trois canaux 4 disposés à 120° l'un de l'autre et transversaux par rapport à l'axe du tube 1. Le nombre de ces canaux 4 et leur angle par rapport à l'axe du tube 1 peut varier en fonction de la pression du gaz insufflé dans le tube, du débit de ce gaz et de l'emplacement qu'occupe la lance par rapport aux parois du récipient métallurgique contenant le métal liquide que l'on veut traiter.In the embodiment of Figure 1, the end 1b of the tube 1 is completely covered by the coating 2. This part 2a of the coating which covers the end 1b of the tube 1 is crossed by three channels 4 arranged at 120 ° one on the other and transverse to the axis of the tube 1. The number of these channels 4 and their angle to the axis of the tube 1 can vary depending on the pressure of the gas blown into the tube, the flow of this gas and the location occupied by the lance relative to the walls of the metallurgical container containing the liquid metal that is to be treated.

L'extrémité de la lance peut également se terminer suivant le plan P représenté en trait mixte sur la figure 1. Dans ce cas, le tube 1 débouche directement à l'extérieur de la lance. On peut cependant incorporer dans l'extrémité de ce tube 1 un bouchon poreux 5 (représenté en pointillés).The end of the lance can also end along the plane P shown in phantom in Figure 1. In this case, the tube 1 opens directly outside the lance. It is however possible to incorporate into the end of this tube 1 a porous plug 5 (shown in dotted lines).

Des bouchons poreux peuvent également être incorporés dans les canaux 4.Porous plugs can also be incorporated in the channels 4.

L'embout fileté 1a du tube 1 peut être raccordé à un appareillage siuté au-dessus du récipient métallurgique contenant le métal à traiter et capable de déplacer la lance suivant un mouvement de translation axial et/ou latéral.The threaded end piece 1a of the tube 1 can be connected to an apparatus located above the metallurgical container containing the metal to be treated and capable of moving the lance in an axial and / or lateral translational movement.

La réalisation représenté sur la figure 2 diffère de celle de la figure 1 par le fait que l'extrémité de la lance comprend une tête 3 amovible vissée ou emboîtée sur l'extrémité 1b du tube, cette tête 3 comportant des canaux 4, comme dans le cas de la réalisation selon la figure 1.The embodiment shown in FIG. 2 differs from that of FIG. 1 in that the end of the lance comprises a removable head 3 screwed or fitted onto the end 1b of the tube, this head 3 comprising channels 4, as in the case of the embodiment according to FIG. 1.

On va maintenant décrire en référence aux figures 3, 4 et 5, divers modes de fabrication de la lance conforme à l'invention.We will now describe with reference to Figures 3, 4 and 5, various methods of manufacturing the lance according to the invention.

Dans le mode de fabrication illustré par la figure 3, on applique la composition du revêtement 2 sous forme de boue aqueuse sur un cylindre perforé 6 recouvert d'un grillage fin 7 et on fait le vide à l'intérieur du cylindre perforé 6 à travers le tube 1 pour aspirer dans celui-ci l'eau contenue dans la boue formant le revêtement 2. A la fin de cette opération, le revêtement 2 est ensuite durci dans un four. Le revêtement 2 est réalisé, soit d'une seule pièce, soit en plusieurs éléments dont les extrémités forment de préférence un assemblage étanche du type "tenon et mortaise".In the manufacturing method illustrated in FIG. 3, the composition of the coating 2 is applied in the form of aqueous mud to a perforated cylinder 6 covered with a fine mesh 7 and a vacuum is created inside the perforated cylinder 6 through the tube 1 for sucking therein the water contained in the mud forming the coating 2. At the end of this operation, the coating 2 is then hardened in an oven. The coating 2 is made, either in one piece, or in several elements, the ends of which preferably form a sealed assembly of the "tenon and mortise" type.

Le tube 1 est au départ rétracté du cylindre perforé 6, comme indiqué sur la figure 3. En fin d'opération, on enfonce le tube 1 dans le cylindre perforé 6. Le tube 1 est rendu solidaire du cylindre perforé 6 grâce à des moyens d'encliquetage complémentaires 8, 9 ou autres tels que des moyens coopérant par vissage.The tube 1 is initially retracted from the perforated cylinder 6, as indicated in FIG. 3. At the end of the operation, the tube 1 is pushed into the perforated cylinder 6. The tube 1 is made integral with the perforated cylinder 6 by means additional latching 8, 9 or others such as means cooperating by screwing.

Pour réaliser des canaux latéraux dans le revêtement 2, on munit celui-ci de boulons 10 traversant le revêtement 2 et le cylindre perforé 6 qui obturent les canaux latéraux lors de la mise sous vide de l'intérieur du cylindre perforé 7.To make lateral channels in the coating 2, the latter is provided with bolts 10 passing through the coating 2 and the perforated cylinder 6 which seal the lateral channels when the interior of the perforated cylinder 7 is evacuated.

Par ailleurs, le tube 1 est pourvu de tubulures latérales destinées à venir en regard des boulons 10 lorsque le tube 1 est enfoncé dans le cylindre perforé 6. Après enlèvement du boulon 10, les canaux formés par ceux-ci dans le revêtement 2 communiquent avec l'intérieur du tube 1.Furthermore, the tube 1 is provided with lateral tubes intended to come opposite the bolts 10 when the tube 1 is pressed into the perforated cylinder 6. After removal of the bolt 10, the channels formed by these in the coating 2 communicate with inside the tube 1.

On peut également désaccoupler le revêtement 2, composé d'un ou de plusieurs manchons, du cylindre perforé 6 recouvert du grillage fin 7 ; l'encliquetage 8 ou des moyens coopérant par vissage sont noyés à poste fixe, dans la masse de l'extrémité inférieure du revêtement 2 sur lequel vient s'encliqueter ou se visser le tube 1. S'il subsiste un jeu entre la surface extérieure du tube 1 et la surface intérieure du revêtement 2, on peut le combler, de préférence à l'aide de ciment et/ou de grains réfractaires.It is also possible to uncouple the coating 2, composed of one or more sleeves, from the perforated cylinder 6 covered with the fine mesh 7; the snap 8 or means cooperating by screwing are embedded in a fixed position, in the mass of the lower end of the covering 2 on which the tube 1 is snapped or screwed in. If there is a clearance between the outer surface of tube 1 and the surface interior of the coating 2, it can be filled, preferably using cement and / or refractory grains.

Selon le mode de fabrication de la figure 4, le revêtement 2 est appliqué par pulvérisation sur un tube cylindrique 11 monté en rotation suivant un axe sur un appareil 12 tel qu'un tour. On peut y adjoindre un cylindre rotatif à surfacer (11a) et prévoir un bac à boues dans lequel plonge au moins en partie le tube 11.According to the manufacturing method of Figure 4, the coating 2 is applied by spraying on a cylindrical tube 11 rotatably mounted on an axis on an apparatus 12 such as a lathe. It is possible to add to it a rotary cylinder to be surfaced (11a) and to provide a mud tank into which the tube 11 at least partially plunges.

Au-dessus du tube cylindrique 11, on dispose une ou plusieurs busette 13 pulvérisant la boue aqueuse constituant le revêtement 2. Cette busette 13 est montée en translation et en rotation suivant un axe 14 parallèle à l'axe du tube 11.Above the cylindrical tube 11, there is one or more nozzle 13 spraying the aqueous mud constituting the coating 2. This nozzle 13 is mounted in translation and in rotation along an axis 14 parallel to the axis of the tube 11.

Selon le mode de fabrication de la figure 5, la boue aqueuse devant constituer le revêtement 2 est introduite par gravité (demi-vue de droite) ou par injection sous pression (demi-vue de gauche) dans un moule composé d'un cylindre extérieur 15, constitué par un récipient cylindrique ou par deux demi-coquilles amovibles, et d'un tube intérieur 1. Ce tube 1 est garni, par exemple, extérieurement par un fil 16 enroulé en hélice qui permet d'améliorer l'adhérence entre le revêtement 2 et le tube 1.According to the manufacturing method of FIG. 5, the aqueous mud intended to constitute the coating 2 is introduced by gravity (half view from the right) or by pressure injection (half view from the left) into a mold composed of an external cylinder. 15, consisting of a cylindrical container or two removable half-shells, and an inner tube 1. This tube 1 is lined, for example, externally by a wire 16 wound in a helix which improves the adhesion between the coating 2 and tube 1.

Le cylindre extérieur 15 comporte en son intérieur des boulons 17 amovibles en même temps que les deux demi-­coquilles de ce cylindre 15 pour former les canaux traversant le revêtement 2 et communiquant avec l'intérieur du tube 1. L'ensemble du moule est de préférence posé sur une table vibrante 18.The outer cylinder 15 has internally removable bolts 17 at the same time as the two half-shells of this cylinder 15 to form the channels passing through the coating 2 and communicating with the interior of the tube 1. The entire mold is of preferably placed on a vibrating table 18.

Lorsque le cylindre 15 est destiné à être une partie intégrante de la lance à injection, les boulons 17 amovibles pour former les canaux sont prévus à l'extérieur dudit cylindre.When the cylinder 15 is intended to be an integral part of the injection lance, the removable bolts 17 for forming the channels are provided on the outside of said cylinder.

Claims (14)

1. Lance pour injecter un gaz et/ou une poudre au sein d'un métal en fusion, comprenant un tube (1) recouvert par un revêtement (2) en matière réfractaire, caractérisée en ce que cette matière est composée d'un mélange de particules réfractaires à caractère basique ou silico-alumineux ou alumineux enrobées dans un liant, ce mélange réfractaire étant frittable à la température du métal en fusion.1. Lance for injecting a gas and / or a powder into a molten metal, comprising a tube (1) covered by a coating (2) of refractory material, characterized in that this material is composed of a mixture refractory particles of basic or silico-aluminous or aluminous character coated in a binder, this refractory mixture being sinterable at the temperature of the molten metal. 2. Lance conforme à la revendication 1, caractérisée en ce que le tube (1) est en métal.2. Lance according to claim 1, characterized in that the tube (1) is made of metal. 3. Lance conforme à la revendication 1, caractérisée en ce que le tube (1) est en matière à base de fibres choisies parmi les suivantes :
- fibres de cellulose,
- fibres synthétiques,
- fibres de carbone,
- fibres de Kevlar,
- fibres minérales réfractaires et les mélanges de ces fibres.3. Lance according to claim 1, characterized in that the tube (1) is made of a material based on fibers chosen from the following:
- cellulose fibers,
- synthetic fibers,
- carbon fibers,
- Kevlar fibers,
- refractory mineral fibers and mixtures of these fibers. 4. Lance conforme à l'une des revendications 1 à 3, caractérisée en ce qu'elle est constituée par plusieurs éléments assemblés les uns aux autres.4. Lance according to one of claims 1 to 3, characterized in that it is constituted by several elements assembled to each other. 5. Lance conforme à l'une des revendications 1 à 4, caractérisée en ce que le tube (1) comprend des moyens d'accrochage du revêtement.5. Lance according to one of claims 1 to 4, characterized in that the tube (1) comprises means for hooking the coating. 6. Lance conforme à l'une des revendications 1 à 5, caractérisée en ce que le revêtement a la composition pondérale suivante :
. Composés tensio-actifs (agents mouillants ou dispersants) .............................0 à 2%
. Silice colloïdale et/ou cendre de silicium ... 0 à 8%
. Magnésie et/ou autres composés magnésiens ou alumineux ou silico-alumineux sous forme de poudre, de granulométrie comprise entre 0,2 et 5 mm .................... 3 à 96%
. Magnésie ou autres composés magnésiens ou silico-alumineux ou alumineux, sous forme de poudre de granulométrie inférieure à 0,2 mm ......................................................... 15 à 96%
. Fibres (cellulosiques, végétales, organiques, synthétiques ou minérales et leur mélange) .... 0 à 6%
. Fondants ....................................................... 0 à 20%
. Acide borique ............................................. 0 à 3%
. Carbone et/ou autres réducteurs ....... 0 à 10%
. Liants organiques ou inorganiques ... 0 à 18%
. Plastifiants minéraux ou organiques. 0 à 5%6. Lance according to one of claims 1 to 5, characterized in that the coating has the following weight composition:
. Surfactants (wetting or dispersing agents) ............................. 0 to 2%
. Colloidal silica and / or silicon ash ... 0 to 8%
. Magnesia and / or other magnesium or aluminous or silico-aluminous compounds in the form of powder, of grain size between 0.2 and 5 mm .................... 3 to 96%
. Magnesia or other magnesium or silico-aluminous or aluminous compounds, in the form of powder with a particle size less than 0.2 mm .......................... ............................... 15 to 96%
. Fibers (cellulosic, vegetable, organic, synthetic or mineral and their mixture) .... 0 to 6%
. Fondants ................................................. ...... 0 to 20%
. Boric acid ............................................. 0 to 3 %
. Carbon and / or other reducers ....... 0 to 10%
. Organic or inorganic binders ... 0 to 18%
. Mineral or organic plasticizers. 0 to 5% 7. Lance conforme à l'une des revendications 1 à 6, caractérisée en ce que le revêtement (2) comprend une partie qui recouvre entièrement l'extrémité du tube (1), cette partie étant traversée par des canaux (4) débouchant à l'intérieur du tube et s'étendant transversalement par rapport à l'axe de ce tube.7. Lance according to one of claims 1 to 6, characterized in that the coating (2) comprises a part which completely covers the end of the tube (1), this part being traversed by channels (4) opening out inside the tube and extending transversely with respect to the axis of this tube. 8. Lance conforme à la revendication 7, caractérisée en ce que ladite partie du revêtement est amovible par rapport au reste du revêtement.8. Lance according to claim 7, characterized in that said part of the coating is removable from the rest of the coating. 9. Lance conforme à l'une des revendications 1 à 8, caractérisée en ce qu'elle comporte un manteau métallique extérieur.9. Lance according to one of claims 1 to 8, characterized in that it comprises an outer metallic mantle. 10. Procédé pour la fabrication d'une lance d'injection conforme à l'une des revendications 1 à 9, caractérisé en ce qu'on applique autour d'un tube (6, 11, 1) une boue aqueuse renfermant les constituants du revêtement (2).10. Method for manufacturing an injection lance according to one of claims 1 to 9, characterized in that it is applied around a tube (6, 11, 1) an aqueous mud containing the constituents of the coating (2). 11. Procédé conforme à la revendication 10, caractérisé en ce qu'on applique la boue aqueuse autour d'un cylindre perforé (6), on fait le vide à l'intérieur de celui-­ci et on fixe à l'intérieur du cylindre (6) ou du revêtement (2) un tube (1), le revêtement (2) étant réalisé en un seul ou en plusieurs manchons, l'espace libre pouvant subsister entre (6) ou (2) et (1) étant rempli, de préférence, de ciment et/ou de grains réfractaires additionnés ou non de résine, frittable ou non frittable.11. Method according to claim 10, characterized in that the aqueous mud is applied around a perforated cylinder (6), a vacuum is created inside it and fixed inside the cylinder (6) or of the covering (2) a tube (1), the covering (2) being produced in a single or in several sleeves, the free space which may remain between (6) or (2) and (1) being filled , preferably, of cement and / or refractory grains with or without resin, sinterable or non-sinterable. 12. Procédé conforme à la revendication 10, caractérisé en ce qu'on pulvérise la boue aqueuse sur un tube (11) au moyen d'une ou plusieurs busette (13) que l'on déplace parallèlement à l'axe du tube, et on fait tourner ce dernier autour de son axe.12. Method according to claim 10, characterized in that the aqueous mud is sprayed onto a tube (11) by means of one or more nozzles (13) which are moved parallel to the axis of the tube, and we rotate the latter around its axis. 13. Procédé conforme à la revendication 10, caractérisé en ce qu'on introduit la boue aqueuse dans un moule comprenant un tube cylindrique extérieur (15) en deux parties amovibles et un tube intérieur (1).13. Method according to claim 10, characterized in that the aqueous slurry is introduced into a mold comprising an outer cylindrical tube (15) in two removable parts and an inner tube (1). 14. Procédé conforme aux revendications 1 à10, caractérisé en ce qu'on introduit de la boue aqueuse entre un manteau extérieur (15) et un tube intérieur (1), ledit manteau faisant partie intégrante de l'ensemble.14. Method according to claims 1 to 10, characterized in that aqueous mud is introduced between an outer jacket (15) and an inner tube (1), said jacket being an integral part of the assembly.
EP86402816A 1985-12-26 1986-12-16 Injection lance for a metallurgical vessel and process for its fabrication Withdrawn EP0232648A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8519246A FR2592393B1 (en) 1985-12-26 1985-12-26 INJECTION LANCE FOR METALLURGICAL CONTAINER AND METHOD FOR MANUFACTURING SAME.
FR8519246 1985-12-26

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EP0232648A1 true EP0232648A1 (en) 1987-08-19

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EP86402816A Withdrawn EP0232648A1 (en) 1985-12-26 1986-12-16 Injection lance for a metallurgical vessel and process for its fabrication

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EP (1) EP0232648A1 (en)
AU (1) AU590654B2 (en)
BR (1) BR8606444A (en)
FR (1) FR2592393B1 (en)
ZA (1) ZA869670B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230848A (en) * 1989-04-26 1990-10-31 Insul Co Inc Applying gas to molten metal
WO2007021238A1 (en) * 2005-08-19 2007-02-22 Aga Ab Lance to be used during combustion
CN111995420A (en) * 2020-09-03 2020-11-27 昆明理工大学 Ceramic matrix composite coating material for long-life spray gun for Isa smelting and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2058967A1 (en) * 1970-12-01 1972-06-15 Sueddeutsche Kalkstickstoff Immersed tuyere - with refractory coating for injecting powdered materials into molten metals
DE2439700A1 (en) * 1973-08-22 1975-03-06 Stein Refractories LANCE FOR INJECTION OF FLUIDIZED MATERIALS INTO A METAL MELT AND PROCESS FOR THEIR PRODUCTION

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JPS55145113A (en) * 1979-05-02 1980-11-12 Kawasaki Steel Corp Lance sleeve for desulfurization of molten cast iron
JPS6089515A (en) * 1983-10-21 1985-05-20 Kawasaki Refract Co Ltd Blowing lance for refining of molten metal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2058967A1 (en) * 1970-12-01 1972-06-15 Sueddeutsche Kalkstickstoff Immersed tuyere - with refractory coating for injecting powdered materials into molten metals
DE2439700A1 (en) * 1973-08-22 1975-03-06 Stein Refractories LANCE FOR INJECTION OF FLUIDIZED MATERIALS INTO A METAL MELT AND PROCESS FOR THEIR PRODUCTION

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 16 (C-41)[688], 30 janvier 1981; & JP-A-55 145 113 (KAWASAKI SEITETSU K.K.) 12-11-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 228 (C-303)[1951], 13 septembre 1985; & JP-A-60 89 515 (KAWASAKI ROZAI K.K.) 20-05-1985 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230848A (en) * 1989-04-26 1990-10-31 Insul Co Inc Applying gas to molten metal
GB2230848B (en) * 1989-04-26 1993-01-13 Insul Co Inc Lance for use in treating a bath of molten metal
WO2007021238A1 (en) * 2005-08-19 2007-02-22 Aga Ab Lance to be used during combustion
CN111995420A (en) * 2020-09-03 2020-11-27 昆明理工大学 Ceramic matrix composite coating material for long-life spray gun for Isa smelting and preparation method thereof

Also Published As

Publication number Publication date
BR8606444A (en) 1987-10-20
FR2592393B1 (en) 1991-12-27
AU6689086A (en) 1987-07-02
ZA869670B (en) 1987-08-26
FR2592393A1 (en) 1987-07-03
AU590654B2 (en) 1989-11-09

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