EP0021861B2 - Pièce réfractaire perméable aux gaz et son procédé de fabrication - Google Patents

Pièce réfractaire perméable aux gaz et son procédé de fabrication Download PDF

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Publication number
EP0021861B2
EP0021861B2 EP80400536A EP80400536A EP0021861B2 EP 0021861 B2 EP0021861 B2 EP 0021861B2 EP 80400536 A EP80400536 A EP 80400536A EP 80400536 A EP80400536 A EP 80400536A EP 0021861 B2 EP0021861 B2 EP 0021861B2
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EP
European Patent Office
Prior art keywords
refractory
gas
elements
metal
bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP80400536A
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German (de)
English (en)
French (fr)
Other versions
EP0021861B1 (fr
EP0021861A1 (fr
Inventor
Pierre Vayssiere
Charles Roederer
Jean-Claude Grosjean
Roland Grave
François Schleimer
Fernand Goedert
Romain Henrion
Lucien Lorang
Joseph Colling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut de Recherches de la Siderurgie Francaise IRSID
Arcelor Luxembourg SA
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
Arbed SA
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Application filed by Institut de Recherches de la Siderurgie Francaise IRSID, Arbed SA filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT80400536T priority Critical patent/ATE11305T1/de
Publication of EP0021861A1 publication Critical patent/EP0021861A1/fr
Publication of EP0021861B1 publication Critical patent/EP0021861B1/fr
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Classifications

    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • the present invention relates to parts made of refractory material, permeable to gases and to their manufacturing process.
  • this permeability should also be "oriented" since it involves directing the flow of the blown gas in such a way that it enters under pressure into the porous part by one face and so by the opposite face in contact with the molten metal, the other faces must remain completely sealed in order to prevent excessive lateral loss of the gas which naturally tends to grow with the height of the part.
  • a sealed receptacle constituted for example by a metallic envelope (French patent n ° 1.031.504), or by a layer of refractory concrete made waterproof by the choice of a finer grain size than that of the central region (French patents n ° 1,183,569 and n ° 1,350,751).
  • the object of the present invention is to provide a refractory piece whose gas permeability simultaneously presents all the requisite qualities of selectivity and orientation so as to have a lifetime substantially equal to that of the refractory lining of the container intended to receive it. , while allowing to inject the desired gas flow rates.
  • Another object of the invention is to be able to produce a part of the aforementioned type retaining the cumulative advantages of an oriented permeability specific to parts of homogeneous structure with a network of fine internal channels, and of the simplicity of manufacture specific to porous parts of structure. composite and this without having to bear the respective drawbacks.
  • the invention relates to a refractory part permeable to gases, intended to constitute a means of pneumatic stirring of a metal bath in a metallurgical container by taking place in the refractory lining of this container at a level located under the surface of the bath so as to be brought into contact with said bath by one of its faces, permeable refractory part comprising a part made of non-porous refractory material and a metal part serving as a housing for the refractory part, said metal part being formed of a side envelope and a closure plate placed opposite the face of the refractory part opposite to that intended to be brought into contact with the metal bath and provided with means for supplying gas under pressure, said refractory part consisting of juxtaposed refractory elements without material seals between them so as to provide between them gas passage zones which are formed by slots which extend over its entire height in the direction of the gas blowing by connecting the side intended to be placed in contact with the bath to the opposite side opposite the closing plate, part characterized
  • the part made of non-porous refractory material is formed of a monolithic refractory block internally comprising recesses which pass right through in the direction of the gas blowing and in which are attached, without material seals sealing, smooth-walled elements, non-destructible when hot, so as to provide between each element and the refractory block passage zones for the gas which are formed by slots which extend over the entire height of said block in the direction blowing gas by connecting the face intended to be placed in contact with the metal bath to the opposite face opposite the closure plate and in that a gas distribution chamber in said slots is provided at the base of the refractory block and in which open the pressurized gas supply means.
  • the idea underlying the invention therefore consists in creating an artificial permeability in a piece of refractory material which is not naturally permeable, by providing in it discontinuities oriented in the direction of blowing. gaseous and produced by a particular design of the part, namely by an assembly of elements defining between them narrow slots through which the gas passes.
  • This assembly can be carried out in two distinct ways: either by incorporation in a refractory block of longitudinal dispersed metal or refractory elements, which pass right through the block in the direction of the blowing (that is to say according to the height of the part), either by a juxtaposition of independent refractory elements and also oriented in the direction of blowing.
  • the gas passage slots are located on the periphery of the elements added in the refractory block, while, in the second case, they are more diffuse because they are distributed in the joint planes, that is to say according to more or less rectilinear narrow slots which go to the ends of the part and which, consequently, divide the latter into a plurality of unitary elements.
  • This new design of permeable refractory brick finally achieves the desired double objective, namely a durability of the part equal to that of the refractory lining of the metallurgical container in which it is installed and a high capacity in gas flow, adapted to the volume of the volume. bath contained in this container.
  • This last particularity seems in particular due to the fact that the assembly of the constituent elements of the part being carried out without worrying about the tightness of the junction zones, it can pass in the latter a greater flow of gas than through the mass refractory, as porous as it is. This being the case, there is no need to have recourse to the extremely porous masses known previously, which allow fairly high gas flow rates, but which also wear out very quickly.
  • the refractory assembly is advantageously placed in a metal receptacle constituted by a lateral envelope open at one end so as to leave free the upper face of the refractory mass, intended to be brought into contact with the molten metal and leaving , of course, appear on its surface local discontinuities for the passage of gas, the other end of the metal casing being closed by a closure plate equipped with means for supplying the blowing gas.
  • the metal receptacle has the function in particular of ensuring a lateral seal at the periphery of the refractory mass. Furthermore, thanks to its more regular and smoother outer surface than that of the refractory, the metal envelope allows a narrow application of the part on the walls of the hole made in the refractory lining which receives it, or facilitates the extraction of this part with a view to its replacement, if necessary. We can also point out the role of this envelope as a reinforcement protecting the interior refractory mass against possible shocks during transport or handling.
  • the part constructed by assembling juxtaposed unit elements can be produced according to several variants.
  • a first category of variants takes into account the form of the juxtaposed refractory elements.
  • the latter may have a flattened shape (plate, strip, etc.) the equal width of which, and therefore defines, that of the refractory piece.
  • the elements are juxtaposed by their large lateral faces, succeeding each other parallel to each other along the length of the part.
  • the refractory elements can also have a more compact and elongated shape (parallelepiped with square base or slightly rectangular) whose sides are of dimensions smaller than those of the part.
  • the elements are juxtaposed parallel to each other by their four lateral faces, succeeding each other this time along the length and also according to the width of the part.
  • a second category of variants is based on the method of assembling the juxtaposed elements.
  • refractory elements with interposition between them of separation means so as to keep them at a short distance from each other and thus be able to increase the blowing rates if necessary.
  • separation means can take many forms. These are, for example, calibrated spacers providing open joints between the refractory elements, such as metallic or other wires, oriented in the direction of the gas blowing, or refractory concrete inserts housed in longitudinal notches provided for this purpose. facing each other on the side faces of the juxtaposed refractory elements.
  • separation means can also consist of bulkheads inserted and inserted without any apparent play between the refractory elements, for example plates made of porous refractory material, therefore permeable, or simple metallic strips of flat or corrugated shape.
  • the strip is corrugated, the junction area is further increased, therefore also the blowing possibilities.
  • the permeability of the part can be increased by providing surface grooves on the lateral faces of the elements which, once these have been assembled, will form fine rectilinear channels for the passage of the blowing gas.
  • Figure 1 shows the entire permeable refractory piece as it can be presented to the user before being incorporated into the masonry of the metallurgical container intended to receive it, for example an oxygen blast converter from above .
  • This part is essentially constituted by an assembly 1 of refractory plates 2 having the same height h and the same width 1 as the part.
  • the refractory plates 2 are juxtaposed and pressed so as to be in mutual contact by their large faces, succeeding one another according to the length L of the part.
  • the tightening and cohesion of the assembly are ensured by shrinking, by means of an envelope 3 constituted by a steel sheet of approximately 1 mm thick.
  • a closing plate 4 completes the envelope 3 so as to produce a sealed receptacle in which the assembly 1 is adjusted.
  • the supply of the pressurized blowing gas takes place, in the direction indicated by the arrow, by a pipe 5 fixed in leaktight manner on the closure plate 4 around an orifice 6, which opens into a gas distribution channel 7 formed inside the assembly 1.
  • the plates 2 constituting the latter are made of refractory material of conventional composition and manufacture, for example in cooked magnesia without prior particle size selection, therefore non-porous.
  • their juxtaposition without material seals in accordance with the invention, defines in the room narrow slots parallel to each other, referenced 8 in Figure 1 and appearing on the surface in a rectilinear network according to the width of the room.
  • These slots 8 constitute passage zones allowing the pressurized gas arriving in the distribution channel 7 to pass through the refractory assembly 1 and to come out at the end in contact with the liquid metal. It is understood that the presence of these permeable regions well located in the joint planes, gives the refractory assembly 1 thus formed an anisotropic permeability, that is to say oriented in the direction of gas blowing.
  • the limit permeability threshold corresponds to a micro-passage section of the order of 1 mm2 maximum.
  • the variant embodiment illustrated in FIG. 3, consists in replacing the gas distribution channel, internal to the refractory assembly, by a space 7 ′ having the same function but disposed externally and below the refractory assembly 1.
  • the immediate advantage of this type of embodiment lies in the fact that the gas distribution space this time affects the entire section of the assembly refractory 1, which was not the case in the previous variant.
  • the part of FIG. 3 is produced from that illustrated in FIGS. 1 and 2 by replacing the closure plate 4 with a base plate 12 with openwork perforations 14 which can be distributed at random, but preferably located at right joint planes designated at 8 in FIG. 1.
  • the part thus obtained composed of the assembly 1 buried by the envelope 3 and by the base plate 12, is placed in a lower frame 11 comprising a closure plate 4 ′ And an end ferrule 13 on which is placed, then welded for sealing reasons, the upper part.
  • a distribution space 7 ′ is received between the base plate 12 and the closure plate 4 ′ receiving the blowing gas through an opening 6 ′ formed in the closure plate and extended by a supply line 5 ′, And distributing it in the permeable assembly 1 through the perforations 14.
  • the envelope 3 extends over the entire height of the refractory plates. It does not have the sole function of mechanically maintaining the assembly 1, but also serves to channel in the right direction the gases which would tend to escape laterally.
  • trapezoidal shape of the part illustrated in the figures in no way constitutes a necessary characteristic of the invention, but a relatively usual arrangement having the role of ensuring, under the pressure of the blowing gas, the blocking of assembly 1 in the masonry of the oven and thus avoid any risk of being propelled into the metal bath.
  • other means ensuring such blocking may be suitable.
  • the number of refractory plates 2 (or 2 ′) constituting the assembly 1 this number is left to the free choice of the user.
  • the thickness of the refractory plates it is advantageously around 3 to 5 cm. Under these conditions, if one chooses, for the permeable part, a format equivalent to that of a conventional refractory brick (15 x 10 cm) in order to be able to carry out a simple substitution, the number of plates juxtaposed according to the length of the piece is then five, as it is the case of figure 1.
  • the non-porous refractory elements used for the construction of the part according to the invention, are not necessarily plates but can have other shapes or formats, insofar as it remains possible to assemble them in juxtaposing them against each other by their lateral faces, that is to say so as to give the joint planes a common direction, which is that of the crossing of the gas.
  • these means have the essential function of maintaining the refractory elements 2 at a short distance from each other. They can for example be constituted by thin sheets, preferably of thickness less than a millimeter, flat or corrugated and interposed without apparent play between the refractory elements 2.
  • the sheets of separation, as well as the outer casing are advantageously coated with a protective layer against the risks of recarburization by contact with the cast iron.
  • partitioning can be put in place at the same time as the refractory elements 2 according to an alternating assembly process.
  • partitioning it is also possible to use partitioning as a cell mold in which the non-porous refractory material is poured, which makes it possible to avoid, if desired, achieving the desired discontinuities in the refractory mass without having to assemble preformed refractory elements.
  • FIGS. 4 and 5 another category of variant embodiments of the invention, consisting of separating the refractory elements by means of spacers making open joints between them.
  • a part 16, 16 ′ is shown here produced by assembling parallelepipedic elements 18 of the same height h as the part and juxtaposed by their lateral faces, one after the other along the length L and the width 1 of the part. It is clear, however, that the presence of spacers between the elements is not linked to a particular shape of the latter and may very well be envisaged in the case of refractory elements shaped into plates extending over the entire width. of the part, as shown in FIG. 1. Referring to FIGS.
  • the permeable refractory part 16 (16 ′) is essentially constituted by an assembly 17 of non-porous refractory elements 18, four in number in the two examples considered, and joined together in a non-contiguous manner by interposing spacers 19 (19 ′).
  • the cohesion of the assembly is ensured as before by compressive hooping by means of the lateral metal envelope 3.
  • the closure plate 4 completes the envelope in the usual manner, in order to produce a sealed receptacle in which the assembly does not appears only by its free upper face intended to be brought into contact with the molten metal contained in the metallurgical container.
  • the supply of pressurized insufflation gas is carried out, in the direction indicated by the arrow, by the supply pipe 5 mounted in leaktight manner on the closure plate 4 and connected to a power source not shown.
  • the elements 18 constituting the assembly are advantageously made of refractory material of conventional composition and manufacture, for example made of magnesia baked at high temperature to withstand chemical and mechanical wear well by contact with the slag, but without prior particle size selection, therefore non-porous naturally.
  • their non-joining meeting by means spacers 19, (19 ′) defines between them narrow spaces 20, constituting obligatory passage slots for the pressurized gas arriving at the base of the part via line 5 and passing through the refractory assembly 17 for emerge from the free upper end in contact with the molten metal. It is understood that the presence of these blowing spaces 20 located at the joint planes of the assembly gives the latter a "directed" permeability in the direction of the gas blowing.
  • the spacers 19 (19 ′) it is important that they are designed so as to provide narrow blowing slots 20, that is to say the width of which is preferably between 0.1 and 0 , 5 mm. Indeed, the permeability of the part 16 (16 ′) depends only on the width of the slots 20. It can therefore, at least in principle, be increased or reduced at will by simply modifying the gauge of the spacers. However, since permeability varies in the opposite direction to "selectivity", the risk of infiltration of molten metal increases with the thickness of the shims. In this regard, it is therefore preferable that the thickness of the shims is as small as possible.
  • the lower limit remains however conditioned by the unit flow of gas to be passed through the refractory piece, taking into account the pneumatic pressure which may be available upstream of the piece.
  • the pneumatic pressure which must be maintained to avoid infiltration of molten metal, then generates a large gas flow, often in pure loss, of as much as this flow rate must then be maintained continuously even outside of the metal production phases requiring gas blowing.
  • the thickness of the spacers is preferably close to 0.3 mm and in any case, between approximately 0.1 mm and 0.5 mm.
  • the spacers can have multiple different embodiments insofar as they do not obstruct the passage section of the spaces 20 sufficiently large to prevent the flow of stirring gas that is wish to pass there.
  • the spacers may be constituted for example by surface irregularities of the elements 18 deliberately pronounced, such as pins or protrusions in the form of pellets, obtained by molding during the manufacture of these elements.
  • Another embodiment consists in attaching the spacers between the elements at the time of the assembly operation.
  • the shims are advantageously in the form of elongated bodies, oriented longitudinally in the slots 20, that is to say in the direction of passage of the stirring gas so as not to hinder the passage thereof.
  • Figures 4 and 5 respectively illustrate two different embodiments of spacers of this type.
  • the spacers 19 are simple commercial metal wires, preferably of steel, and calibrated to the desired dimension. There are four of them, one for each refractory element, and all oriented longitudinally so as to reduce their master-torque as much as possible in the gas flow. Their position can be arbitrary, however, it is preferable to locate them at the ends of the joint planes in order to minimize, as we understand, the functional clearances of the elements at the time of their assembly.
  • the spacers 19 ′ are constituted by refractory concrete inserts housed in notches 22 provided at the ends of the joint planes and obtained during the assembly of the elements 18 which have at this effect a clearance along their edge.
  • the inserts can be cast on site after non-contiguous meeting of the elements 18 thanks to the spacers 23 arranged in the immediate vicinity of the notches and having the dual role of providing the blowing slots 20 and of constituting a sealing member allowing the casting of the inserts without risk of concrete infiltration into the slots 20.
  • the spacers 23 are advantageously of the same shape and the same size as the metal wires 19 (FIG. 4). However, unlike the latter, their function of spacer being only temporary since they serve as relays for the inserts 19 ′, they can be made of wires of hot-destroyable material, for example polyamides such as that sold. under the "nylon" mark which can be eliminated either in the last phase of manufacturing the part, or allowed to destroy hot when commissioning the converter.
  • the variant embodiments described with reference to the figures are characterized in particular by the fact that the spacers 19 or 19 ′ are bodies attached throughout the part and not, as indicated above, integral parts of the refractory elements preformed and specially designed for the manufacture of the part according to the invention, which is obviously not without influence on the cost price thereof.
  • the installation of added spacers makes it possible to use refractory elements which are completely commonplace, or even "standard” in trade.
  • a substantial advantage of the invention resides in the fact that the part 16 (16 ′) can be easily produced by taking as raw material a simple commercial refractory brick which is transformed according to the process which will be explained. .
  • a commercial brick, made of non-porous refractory material, such as baked magnesia, is cut with a saw in the longitudinal direction.
  • the elements obtained are then joined in a non-contiguous manner by placing between them the calibrated spacers 19 (FIG. 4) or, where appropriate, the temporary spacers 23 (FIG. 5).
  • the edges of the elements located in the vicinity of the spacers are subjected beforehand to a removal of material, for example by milling, so as to be able to form the notches 22 in which a concrete insert 19 ′ is poured by any suitable means. .
  • the cohesion of the assembly is then ensured by shrinking by means of the lateral metal casing 3 with the interposition of a layer of jointing product 21 which seals the gas at the level of the casing.
  • the assembly is completed by the closure plate 4 added by welding on the lower edge of the envelope.
  • the performance that can be expected from the part thus produced as a blowing member is conditioned, in particular by the quality of the gas tightness at the envelope-refractory elements interface.
  • This tightness directly linked to the nature of the jointing product 21 and / or to the way in which it is put in place.
  • the jointing product is advantageously a swelling refractory concrete which is poured in the liquid state in the interval initially provided between the metal casing and the refractory elements. The swelling, during the subsequent discharge, then causes, by reaction of the envelope and the elements, a jointing compression ensuring the desired tightness.
  • this variant of embodiment requires knowledge and therefore control, always delicate, of the mechanical stresses which develop in the part and which can, in particular, lead to deformations of the envelope by swelling which make it more difficult, even random. , the incorporation of the part in the masonry of the metallurgical container intended to receive it.
  • a preferred variant which corresponds to the best embodiment that the inventors know how to do at present, consists in operating as follows: the metal casing 3 consisting of two half-shells 24 and 25 equal and in profile U-shaped.
  • the metal casing 3 consisting of two half-shells 24 and 25 equal and in profile U-shaped.
  • An identical basting is then carried out on the inner face of the half-shell 25 which is then arranged around half of the assembly protruding from the half-shell 24.
  • the half-shells are dimensioned so that, at this stage of the operation, their respective edges are opposite in pairs.
  • Another advantageous variant of the invention consists in sawing the starting refractory brick according to a cross cut, so as to obtain, as shown in the figures, interlocking blowing slots 20.
  • a saw blade is chosen whose thickness takes account of the thickness of the lateral envelope 3, so as to produce a permeable part which retains the same size as that of the initial brick, which in particular allows to be able to incorporate the permeable part without difficulty into the overall architecture of the refractory lining.
  • the elements 18 are subjected to a temperate heating after cutting and before assembly, in order to eliminate the volatile elements which are inevitably present and which could subsequently leak and therefore clog the blowing spaces.
  • the tempered heating operation can last a few hours and thus make it possible to go from a total carbon content of 8% to approximately 2% by weight.
  • the number of refractory elements 18 constituting the assembly is not necessarily equal to four, but may be less than or greater than this number.
  • the notches, arranged opposite one another on the refractory elements and defining a housing for the concrete inserts, are not necessarily placed at the ends of the joint planes, but may be provided in places any inside the blowing slots.
  • the part according to the invention may consist of a non-porous refractory mass, no longer formed of juxtaposed unitary elements, but of a single block having internally recesses which pass through it in the direction of the gas blowing and in which elements, without material seals, are attached with a smooth non-destructible hot wall, for example steel elements, so as to form with the refractory block surrounding the gas passage slots.
  • part according to the invention was specially designed originally as part of the refractory lining of a metallurgical container, such as a converter for refining cast iron into steel, in which a pneumatic stirring of the molten metal bath, it is nonetheless of general application to any industrial practice requiring the passage of a refractory piece by a fluid in the gaseous state.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP80400536A 1979-04-25 1980-04-21 Pièce réfractaire perméable aux gaz et son procédé de fabrication Expired - Lifetime EP0021861B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400536T ATE11305T1 (de) 1979-04-25 1980-04-21 Gasdurchlaessiger koerper aus feuerfestem material und verfahren zu seiner herstellung.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR7910445 1979-04-25
FR7910445A FR2455008A1 (fr) 1979-04-25 1979-04-25 Piece refractaire a permeabilite selective et orientee pour l'insufflation d'un fluide
LU81208A LU81208A1 (fr) 1979-04-25 1979-04-30 Dispositif pour l'injection de gaz a travers le fond dans le bain metallique contenu dans un recipient d'affinage
LU81208 1979-04-30
FR8002905 1980-02-08
FR8002905A FR2475529A1 (fr) 1979-04-25 1980-02-08 Piece permeable en refractaire permeable non poreuse, notamment pour utilisation au convertisseur d'acierie et son procede de fabrication

Publications (3)

Publication Number Publication Date
EP0021861A1 EP0021861A1 (fr) 1981-01-07
EP0021861B1 EP0021861B1 (fr) 1985-01-16
EP0021861B2 true EP0021861B2 (fr) 1992-04-01

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Application Number Title Priority Date Filing Date
EP80400536A Expired - Lifetime EP0021861B2 (fr) 1979-04-25 1980-04-21 Pièce réfractaire perméable aux gaz et son procédé de fabrication

Country Status (12)

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US (2) US4340208A (es)
EP (1) EP0021861B2 (es)
JP (1) JPS55145129A (es)
AT (1) AT376701B (es)
AU (1) AU533373B2 (es)
BR (1) BR8002528A (es)
CA (1) CA1146599A (es)
DE (1) DE3069960D1 (es)
ES (1) ES8103718A1 (es)
FR (2) FR2455008A1 (es)
LU (1) LU81208A1 (es)
PT (1) PT71141A (es)

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU82552A1 (de) * 1980-06-25 1982-01-20 Arbed Feuerfester,gasdurchlaessiger baukoerper
CS241483B2 (en) * 1980-06-25 1986-03-13 Arbed Refractory building body
LU82597A1 (de) * 1980-07-09 1982-02-17 Arbed Feuerfester,gasdurchlaessiger baukoerper
LU83247A1 (de) * 1981-03-23 1983-02-22 Arbed Verfahren und vorrichtung zum behandeln von metallschmelzen im rahmen metallurgischer prozesse
LU83313A1 (de) * 1981-04-22 1983-03-24 Arbed Verfahren und einrichtung zum direkten herstellen von fluessigem eisen
FR2504664A1 (fr) * 1981-04-24 1982-10-29 Francais Aciers Speciaux Dispositif de soufflage de gaz de brassage dans un convertisseur d'affinage des metaux
LU83314A1 (de) * 1981-04-24 1983-03-24 Arbed Verfahren und vorrichtung zum entschwefeln von eisenschmelzen
AU541441B2 (en) * 1981-07-15 1985-01-10 Nippon Steel Corporation Bottom blowing nozzle embedded in a refractory block
NL189008C (nl) * 1981-11-18 1992-12-01 Hoogovens Groep Bv Gasdoorlatend wandelement voor een met vuurvast materiaal bekleed metallurgisch vat, in het bijzonder voor een l.d.-staalconverter.
FR2516938B1 (fr) * 1981-11-23 1986-06-06 Usinor Dispositif pour l'introduction de gaz dans le bain de metal liquide
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AT376701B (de) 1984-12-27
AU533373B2 (en) 1983-11-17
FR2455008A1 (fr) 1980-11-21
ES490903A0 (es) 1981-03-16
EP0021861B1 (fr) 1985-01-16
FR2475529A1 (fr) 1981-08-14
AU5781080A (en) 1980-10-30
US4340208A (en) 1982-07-20
LU81208A1 (fr) 1980-12-16
JPS55145129A (en) 1980-11-12
BR8002528A (pt) 1980-12-09
FR2455008B3 (es) 1982-02-26
CA1146599A (fr) 1983-05-17
USRE32192E (en) 1986-06-24
EP0021861A1 (fr) 1981-01-07
PT71141A (fr) 1980-05-01
DE3069960D1 (en) 1985-02-28
ATA526480A (de) 1984-05-15
FR2475529B1 (es) 1984-02-24
ES8103718A1 (es) 1981-03-16

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