EP0558018B1 - Elément céramique réfractaire préfabriqué pour le montage dans un récipient intermédiaire - Google Patents

Elément céramique réfractaire préfabriqué pour le montage dans un récipient intermédiaire Download PDF

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Publication number
EP0558018B1
EP0558018B1 EP93103026A EP93103026A EP0558018B1 EP 0558018 B1 EP0558018 B1 EP 0558018B1 EP 93103026 A EP93103026 A EP 93103026A EP 93103026 A EP93103026 A EP 93103026A EP 0558018 B1 EP0558018 B1 EP 0558018B1
Authority
EP
European Patent Office
Prior art keywords
frame
part according
tundish
prefabricated part
porous plug
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
EP93103026A
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German (de)
English (en)
Other versions
EP0558018A1 (fr
Inventor
Franz Maier
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.)
Veitsch Radex GmbH and Co OG
Original Assignee
Veitsch Radex GmbH and Co OG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Veitsch Radex GmbH and Co OG filed Critical Veitsch Radex GmbH and Co OG
Publication of EP0558018A1 publication Critical patent/EP0558018A1/fr
Application granted granted Critical
Publication of EP0558018B1 publication Critical patent/EP0558018B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs

Definitions

  • the invention relates to a refractory ceramic prefabricated component for vertical installation in a distributor, also called tundish.
  • Such distributors fulfill the function of an intermediate container in continuous casting plants for the treatment of metallurgical melts.
  • the molten metal is guided from a ladle via a spout into the distribution channel, the distribution channel usually having a pouring area, which is delimited from the other sections of the distributor by a so-called "dam" which is used to calm the supplied metal melt on its way along the Distribution channel is used for pouring.
  • the molten metal flows over the dam.
  • the dams are placed on the bottom of the distributor and are limited in height so that they end below the level of the molten metal. Their primary task is to redirect the flow of the molten metal.
  • Weirs are arranged in the upper section of the distributor, transverse to the flow direction of the melt, and end at a distance from the bottom of the distributor. Their primary task is to hold back slag floating on the molten metal.
  • the flushing elements mentioned are ceramic, gas-permeable components which are arranged in the bottom of the distributor (the distributor channel).
  • a gas for example an inert gas such as argon, is injected into the molten metal through the flushing elements via a gas supply.
  • the flushing elements have the task of separating non-metallic inclusions within the molten metal.
  • a refractory ceramic component is known from EP 0 312 549 B1, which consists of a frame-shaped, dense ceramic receiving part, in which a porous section made of an open-cell, ceramic molded body is arranged.
  • the known component also has a gas line running in the receiving part, which serves to supply an inert gas in the direction of the porous section.
  • the known component fulfills a filter function in that the molten metal is passed through the porous section, whereby on the one hand there is a calming of the molten metal due to a slowdown in the flow rate and at the same time undesirable impurities within the molten metal are discharged from the molten metal with the inert gas flow to the surface of the molten bath become.
  • Another filter element is known from US-A-4,277,281, which is used for installation in a distribution channel, the filter element having a recess on the bottom into which a gas supply line, which is arranged in the bottom of the distributor, projects, via which a treatment gas is guided into the filter element .
  • the filter elements described above also fulfill a kind of "dam function", but only to the extent that they contribute to calming the flow of the molten metal.
  • FR-A-2 642 679 describes a device for eliminating non-metallic inclusions from a steel bath of a distributor. It consists of several components such as a flushing element and baffles. The distance between the baffles should be smaller than the width of the flushing element.
  • the invention is based on the object of demonstrating a possibility with which the treatment of a molten metal in a secondary metallurgical vessel, such as a tundish (a distribution channel), can be simplified in terms of apparatus without foregoing the advantages achieved with the known weirs, dams and dishwashers have to.
  • a secondary metallurgical vessel such as a tundish (a distribution channel)
  • the invention is based on the knowledge that this goal can be achieved by a refractory ceramic prefabricated component in which the functions of a dam, a weir and a flushing device are combined.
  • the basic idea of the invention is to combine a weir, a dam and a flushing element in a single prefabricated component.
  • the invention in its most general embodiment proposes a refractory ceramic prefabricated component for vertical installation in a distributor with the features of claim 1.
  • the frame consists of an upper and a lower horizontal part and two vertical parts connecting them.
  • the upper, horizontal part takes over the function of the well-known weirs, while the lower, horizontal part has the function of a dam.
  • the main difference compared to the filter elements described at the outset is that the frame has a central opening through which the molten metal can flow, whereby it is flow-guided by the dam and weir functions described and slag floating on the surface is retained.
  • the mean residence time of the melt in the distributor can be increased.
  • a surface flow profile of the molten metal is possible.
  • a laminar flow zone behind the dam is achieved by the lower horizontal part of the frame, which takes over the dam function, while - viewed in the flow direction of the melt - a homogenization zone is formed in front of the component.
  • the prefabricated component according to the invention also takes on the function of the flushing elements known from the prior art and used as separate components in the floor.
  • the flushing element is namely integrated in the area of the central opening (through opening) of the component, so that overall a compact component is created which takes over three functions simultaneously.
  • the flushing element should rest on the lower, horizontal frame part. It is preferably firmly anchored there, for example glued or mortared.
  • the rinsing element can be designed with directional or non-directional porosity. In the case of directed porosity, it is formed with individual through-channels which - starting from the gas supply line - extend into the area of the free surfaces of the flushing element and thus enable gas supply from the gas supply line to the molten metal.
  • the through-channels can be formed by appropriate measures in the manufacture of the flushing element. For this purpose, it is advisable to integrate combustible elements into the flushing element during manufacture, which are later burned out. However, it is also possible, for example, to subsequently drill the through-channels and, if necessary, to stabilize them with inserted metal tubes.
  • the through channels can either run directly vertically, so that they run out in the horizontal upper end face of the flushing element; but it is also possible to arrange them inclined so that they end at least partially in the vertical, lateral surfaces of the flushing element.
  • the latter case also makes it possible to direct the gas supply in front of and behind the component, which additionally facilitates the removal of non-metallic inclusions.
  • the flushing element can also - viewed in the direction of flow - project beyond the frame.
  • an essential advantage of the prefabricated component is that a flow profile that is compatible with the surface can be set, that is to say that the molten metal is always directed in the direction of the upper bath level.
  • a flow profile is advantageous because it allows non-metallic inclusions to be removed particularly effectively and deposited on the surface. These non-metallic inclusions are then deposited, for example, using known masking compounds.
  • an advantageous embodiment of the invention provides for the lower, horizontal part of the frame and / or the flushing element to be designed with a corresponding lateral inclined surface, so that the flow of the molten metal is given an upward flow direction. In this way, dead zones behind the horizontal sections of the component can be minimized or prevented altogether. If an exclusively vertical flow direction of the treatment gases supplied is desired, this can be additionally supported by the fact that the vertically running surfaces of the flushing element be formed with a gas-tight coating. Ceramic sizes can be used for this purpose, for example.
  • the dimensions of the prefabricated component described are placed on the associated distributor.
  • the external dimensions of the component correspond to the internal dimensions of the distributor.
  • the component is mortared or glued in the distributor, for example.
  • the positioning of the component can be additionally secured by mounting or reinforcement elements.
  • the distributor is designed with corresponding groove-shaped depressions in the side walls, so that the component can be inserted into these grooves and locked at the same time.
  • a corresponding groove formation is of course also possible and advantageous in the bottom area of the distributor.
  • the component has a height that exceeds the overall height of the distributor.
  • the external connection for the gas supply line can be formed in that section of the component which projects beyond the distributor, so that structural changes to the distributor are not required.
  • the assembly and disassembly of the component or the connected flushing element is made considerably easier. This applies in particular to known, flushing elements arranged in the bottom of the distributor.
  • the component In order to facilitate the assembly of the component, it can be formed in the region of the upper, horizontally running frame part with corresponding assembly devices, for example brackets or the like. Such assembly devices can be cast directly in the manufacture of the frame.
  • the component which can have a considerable weight depending on the size (depending on the distributor), can be easily brought to the desired position in the distributor and positioned there, for example with an appropriate crane system.
  • the frame can consist of a high-alumina mass that is cast, pressed or preferably isostatically pressed.
  • the frame should be designed in such a way that it is largely sealed and can therefore perform the dam and weir functions described.
  • the receiving part of the filter according to EP 0 312 549 B1 is said to be leak-proof, it can for example consist of an isostatically pressed component; however, it cannot assume the function of a weir because the filter has no free passage area for the molten metal and there is no flow control or slag retention function.
  • the main advantage of the prefabricated component described is that it combines the functions of the dams, weirs and flushers used as three separate components in the prior art and at the same time enables the metallurgical advantages described. At the same time, there are manufacturing simplifications, simplifications in assembly and associated cost advantages.
  • the prefabricated component shown in Figure 1 consists of a frame 10 with an upper, horizontal part 10a, a lower, horizontally running part 10b and two vertical legs 10c, d.
  • the frame 10 consists of a dense, high-alumina mass.
  • the frame - in the lateral view - has approximately the shape of a trapezoid, corresponding to the inner cross section of a distributor in which the component is to be inserted.
  • the frame parts 10a to d enclose a central opening 12, which also has an approximately trapezoidal cross-sectional area.
  • the flushing block 14 On the lower, horizontal frame part 10b there is a gas-permeable flushing block 14 which is glued to the corresponding surface sections of the frame parts 10b, c, d.
  • the flushing block consists of a gas-permeable, high-alumina mass with so-called undirected porosity.
  • a gas line (not shown) runs in the flushing block 14, which has a large number of openings through which a treatment gas, for example argon, enters the porous flushing block and from there into the molten metal can be blown.
  • a treatment gas for example argon
  • the section (not shown) of the gas line in the flushing block 14 continues on the connection side in a gas line 16 which leads along the frame part 10c into the frame part 10a and from there to the outside, where it can later be connected to a gas source.
  • the figure finally shows two brackets 18, which are firmly anchored in the upper frame part 10a and represent an assembly aid when the prefabricated component is in the in the figure 2 schematically shown position is used in a distributor.
  • the lower frame part 10b fulfills three functions at the same time: while the upper frame part 10a acts as a weir, i.e. serves to hold back slag and to direct the flow, the lower frame part 10b fulfills a dam function, i.e. it supports the flow deflection of the molten metal, which is shown schematically in FIG. 2 by arrows is.
  • the prefabricated component acts as a flushing device by blowing inert gas into the molten metal via the gas supply line 16 and the flushing block 14.
  • the contact between the inert gas and the molten metal is particularly intense because the molten metal must flow through the central opening 12 and thus immediately above the flushing device.
  • the molten metal can be drawn off later in a laminar flow via a spout 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Furnace Charging Or Discharging (AREA)

Claims (11)

  1. Elément de construction fini, céramique, réfractaire destiné à un montage vertical dans un distributeur, caractérisé par :
    1.1 un cadre (10) étanche, adapté à la section transversale intérieure verticale du distributeur et présentant une ouverture médiane (12),
    1.2 une conduite d'amenée de gaz (16) s'étendant le long de la section de cadre (10c, 10e), qui
    1.3 débouche par son extrémité située côté sortie du gaz dans un élément de balayage (14) perméable au gaz au moins dans la direction de l'ouverture médiane (12), qui
    1.4 est disposé entre les parties verticales (10c, 10d) du cadre (10),
    1.5 l'élément de balayage (14) reposant sur la partie-cadre (10b) inférieure, horizontale.
  2. Elément de construction fini selon la revendication 1, caractérisé en ce que l'élément de balayage (14) est réalisé avec une porosité non orientée.
  3. Elément de construction fini selon la revendication 1 ou 2, caractérisé en ce que l'élément de balayage est réalisé avec une pluralité de canaux de passage, s'étendant sensiblement verticalement et dont chaque fois une extrémité est raccordée à la conduite d'amenée de gaz et dont l'autre extrémité débouche chaque fois dans la surface libre de l'élément de balayage.
  4. Elément de construction fini selon la revendication 3, caractérisé en ce que les canaux de passage passent dans les trois surfaces libres de l'élément de balayage.
  5. Elément de construction fini selon l'une des revendications 1 à 4, caractérisé en ce que les surfaces verticales de l'élément de balayage sont réalisées avec un revêtement étanche au gaz.
  6. Elément de construction fini selon l'une des revendications 1 à 5, caractérisé en ce que les parties-cadres (10a à d) et/ou l'élément de balayage est (sont) réalisé (s) avec un chanfrein dans la direction de l'écoulement du métal en fusion.
  7. Elément de construction fini selon l'une des revendications 1 à 6, caractérisé en ce qu'il y a une hauteur de construction dépassant la hauteur de construction verticale intérieure du distributeur.
  8. Elément de construction fini selon l'une des revendications 1 à 7, caractérisé en ce qu'il y a une largeur supérieure aux dimensions intérieures du distributeur.
  9. Elément de construction fini selon la revendication 7 ou 8, caractérisé en ce que la conduite d'amenée de gaz (16) débouche sur une partie-cadre (10a) dépassant du distributeur dans cette partie-cadre.
  10. Elément de construction fini selon l'une des revendications 1 à 9, caractérisé par des dispositifs de montage (18) dans la zone de la partie-cadre supérieure (10a) libre, s'étendant horizontalement.
  11. Elément de construction fini selon l'une des revendications 1 à 10, caractérisé en ce que le cadre (10) est constitué d'un matériau réfractaire, façonné par exposition à une pression isostatique.
EP93103026A 1992-02-26 1993-02-26 Elément céramique réfractaire préfabriqué pour le montage dans un récipient intermédiaire Expired - Lifetime EP0558018B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205853A DE4205853C1 (de) 1992-02-26 1992-02-26 Feuerfestes keramisches Fertigbauteil zum Einbau in einem Verteiler
DE4205853 1992-02-26

Publications (2)

Publication Number Publication Date
EP0558018A1 EP0558018A1 (fr) 1993-09-01
EP0558018B1 true EP0558018B1 (fr) 1995-09-27

Family

ID=6452601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103026A Expired - Lifetime EP0558018B1 (fr) 1992-02-26 1993-02-26 Elément céramique réfractaire préfabriqué pour le montage dans un récipient intermédiaire

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EP (1) EP0558018B1 (fr)
AT (1) ATE128393T1 (fr)
DE (1) DE4205853C1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551672A (en) * 1995-01-13 1996-09-03 Bethlehem Steel Corporation Apparatus for controlling molten metal flow in a tundish to enhance inclusion float out from a molten metal bath
GB9903937D0 (en) * 1999-02-22 1999-04-14 Foseco Int Tundish impact pad
US11338357B2 (en) 2019-08-19 2022-05-24 Harbisonwalker International, Inc. Diffusion article

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277281A (en) * 1979-08-16 1981-07-07 Southwire Company Continuous filter for molten copper
US4667939A (en) * 1986-03-26 1987-05-26 Foseco International Limited Purifying steel
DE3642201C1 (de) * 1986-12-10 1988-06-16 Radex Deutschland Ag Feuerfestes keramisches Bauteil
FR2642679B3 (fr) * 1988-12-22 1990-11-30 Unimetall Sa Dispositif d'elimination des inclusions non metalliques dans un repartiteur de coulee continue de l'acier
US5018710A (en) * 1990-10-15 1991-05-28 Magneco/Metrel, Inc. Method and devices for removing alumina and other inclusions from steel contained in tundishes

Also Published As

Publication number Publication date
ATE128393T1 (de) 1995-10-15
DE4205853C1 (de) 1993-10-14
EP0558018A1 (fr) 1993-09-01

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