EP0292670B1 - Pièce moulée réfractaire en matériau céramique - Google Patents

Pièce moulée réfractaire en matériau céramique Download PDF

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Publication number
EP0292670B1
EP0292670B1 EP88104933A EP88104933A EP0292670B1 EP 0292670 B1 EP0292670 B1 EP 0292670B1 EP 88104933 A EP88104933 A EP 88104933A EP 88104933 A EP88104933 A EP 88104933A EP 0292670 B1 EP0292670 B1 EP 0292670B1
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EP
European Patent Office
Prior art keywords
shaped member
passage
member according
gas
solids
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
EP88104933A
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German (de)
English (en)
Other versions
EP0292670A3 (en
EP0292670A2 (fr
Inventor
Lorenz Dötsch
Karl-Heinz Höfer
Jean-Louis Retrayt
Bernd Kull
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.)
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Original Assignee
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
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 RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE filed Critical RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Priority to AT88104933T priority Critical patent/ATE54948T1/de
Publication of EP0292670A2 publication Critical patent/EP0292670A2/fr
Publication of EP0292670A3 publication Critical patent/EP0292670A3/de
Application granted granted Critical
Publication of EP0292670B1 publication Critical patent/EP0292670B1/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
    • 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

Definitions

  • the invention relates to a refractory ceramic molded body according to the preamble of claim 1.
  • Such molded bodies are generally referred to as " flushing stones”.
  • Flushing stones are preferably inserted into the wall or the bottom of a metallurgical melting vessel (e.g. converter, pan) and here mostly by means of a perforated brick and are used for blowing in flushing gases, in particular inert flushing gases such as argon, for melt treatment in order to optimize the quality.
  • a metallurgical melting vessel e.g. converter, pan
  • flushing gases in particular inert flushing gases such as argon
  • DE-OS 3 520 207 also describes a sink which is intended to blow gases or solids into a pan containing molten metal.
  • the published application which deals exclusively with the mounting of the sink in the perforated block, shows in the single figure a sink with a central, large passage channel through which gases or solids are to be blown.
  • the embodiment shown with a particularly large passage channel cannot be used in practice because, with this size of a passage channel, molten metal would easily penetrate into the sink and destroy the device.
  • Such solids are fine lime or mixtures of fine lime and soda, but also calcium carbide (CaC 2 ) or calcium cyanamide (CaCN 2 ).
  • a multi-part gas purging plug is known from EP-A 87 261, a common cavity being formed between two sections arranged one above the other, in which a valve body is movably guided.
  • the valve body is manipulated externally via a spindle.
  • the respective valve position must therefore be set manually, which, in addition to the multi-part form, is a major disadvantage of the known device. Blockages can also occur when solids are injected.
  • blowing or immersion lances such as are described, for example, in German utility models 8 622 299 or 8 626 930, are largely used for blowing in solids.
  • Both inert gases and additives of the type mentioned are introduced into the molten metal via blowing lances of this type.
  • the blow lance with the blow head and most of its casing is immersed in the molten metal.
  • the gas and / or the solid is injected into the molten metal via the so-called lance core, usually a steel tube that opens into the blow head with corresponding outlet openings.
  • a particular problem is that when the lance is immersed in the liquid metal bath and during the blowing process, the displacement of the liquid results in strong oscillatory movements and thus large flexing forces which have to be absorbed without damaging the lance and in particular the refractory casing.
  • this problem can practically not be dealt with in the case of a blowing lance which is freely immersed in a molten metal by means of a so-called lance stand.
  • the invention has for its object to provide a way for simple and safe supply of gas and / or solid in the molten metal of a metallurgical vessel, which does not lead to the known mechanical problems with blowing lances, but in which there is also no risk of clogging or a breakthrough of the molten metal can be added to the molten metal without further solids.
  • the aim is to be able to supply both gases and solids, if appropriate in combination, if possible via one device.
  • the invention provides a molded body according to the preamble of claim 1, in which the valve comprises a closing body which seals the passage channel in the starting position (without gas / solid passage) and which seals when a predeterminable gas and / or solid stream is reached Position can be removed and the passage channel releases.
  • the invention also consists in a method according to claim 15 for blowing solid, powdery or granular additives into a molten metal.
  • the invention has recognized that, for example, the channels of gas purging stones with "directed porosity" (Radex-Rundschau, loc. Cit.) Are no more sufficient for transporting solids than the pores in a gas purging plug with "non-directional porosity " .
  • the channel must rather be larger, for example the average diameter is 2 to 10 mm, preferably 4 to 6 mm. With such an open cross section, of course, the risk of penetration of molten metal is greater, which is now reliably prevented by the aforementioned valve formation in the flow channel.
  • the closing body must be larger than the cross section of the passage to ensure a secure seal.
  • the closing body After the body has burned out, only the closing body remains as such, which preferably consists of a high-quality refractory ceramic, for example of zirconium dioxide (Zr0 2 ) or titanium dioxide (Ti0 2 ).
  • a high-quality refractory ceramic for example of zirconium dioxide (Zr0 2 ) or titanium dioxide (Ti0 2 ).
  • Another alternative is to manufacture the part of the sink that receives the check valve separately.
  • This part can in turn consist of two parts, which together form the space of the check valve and have corresponding connection openings for the passage channel.
  • the “block” produced separately in this way is then preferably inserted into the flushing block at the connection end and mortared there, for example.
  • the invention proposes to design the closing body as a ball, so that, regardless of the particular orientation, a secure contact against the passage channel in the closed position is always ensured.
  • Safe sealing for example in the event of an interruption in the blowing process, also ensures that a closed space is created above the valve, the gas column built up therein making it difficult for metal melt to penetrate.
  • valve ensures that the metal flow is stopped in the area of the sink and the metal melt then freezes for a short time.
  • molten metal penetrates only in the uppermost regions of the passage channel and freezes there immediately, which has the advantage that such a sink can be used again. Instead of changing the sink, only the upper, frozen area needs to be drilled out, and the sink is then available for further use.
  • the cooling device can be designed in various ways and can consist, for example, of a cooling line through which liquid or gas can flow and which is arranged directly adjacent to the passage channel.
  • This cooling line can, for example, be helically guided around the through-channel and thus enables intensive cooling which, during normal operation, i.e. when an inert gas and / or a preferably powdery solid is blown through the through-channel, does not disturb the operation, on the other hand immediately in the event that molten metal penetrates the channel, causing it to solidify.
  • the cooling line can be arranged so that it forms a closed circuit, in an alternative embodiment it is provided that the cooling line with the section opposite the connection-side end opens into the surface of the shaped body facing the molten metal of the metallurgical vessel, that is to say the cooling gas sent through is blown into the molten metal.
  • This embodiment can be used, for example, to send the inert gas for purging through the cooling line, while the powdery solids themselves are passed through the passage channel, possibly together with further purging gas.
  • the cooling line is preferably designed as a copper line, which further enhances the desired cooling effect due to excellent heat conduction.
  • This cooling line can also be used to display residual strength at the same time, whereby exemplary residual strength display devices are described, for example, in the Radex Rundschau (loc. Cit.).
  • the electrical conductivity of the copper material of the line can be used, for example, to close or interrupt an electrical circuit when molten metal penetrates and to simultaneously actuate a corresponding signal device.
  • the purging plug is inserted, for example, into a perforated block (possibly via a perforated block sleeve) and is rigidly arranged there.
  • Problems related to mechanical stress such as occur with blowing lances and described above, omitted.
  • the molded body is no longer exposed to mechanical loads, which significantly increases its service life.
  • complex measures to set up a lance stand can be dispensed with.
  • the flushing in of gases and solids in particular at the bottom makes the melt treatment more uniform than processes using blowing lances. Above all, a molded body according to the invention is much cheaper than a known lance arrangement.
  • the molded body can also be combined with a breakthrough protection, as described for example in the Radex-Rundschau (loc. Cit.).
  • the passage channel can be designed like a siphon.
  • the "knee" formed in the connection-side end results in a kind of pressure cushion when the gas / solids supply is reduced or switched off, while in the upper section facing the molten metal in the vessel, any penetrating molten metal is stopped in its flow and thus even faster can freeze, especially when arranging a cooling device.
  • the point of discontinuity in the passage channel generally referred to as a siphon, can be designed in various ways, for example S-shaped.
  • the sink is frustoconical in shape, its upper, narrower end 12 facing the molten metal in the melting vessel and its lower, wider end 14 forming the connection-side end.
  • the sink 10 has a plurality of channels 16, which run essentially parallel to the peripheral surface 18 and have a small diameter (maximum about 1 mm).
  • the dense material between the channels 16 consists essentially of the above-mentioned corundum qualities.
  • a sheet metal casing 20 comprises a sheet metal jacket 22 which extends around the peripheral surface 18 of the sink 10 and a circular base 26 which covers the lower end face of the sink 10 and is welded to the sheet jacket 22 in a gas-tight manner on its outer periphery.
  • the ceramic molded body is inserted into the sheet metal jacket 22 via a mortar layer 28, in such a way that a space 30 remains between the lower end face 24 and the bottom 26, which is achieved by two spacers 32 which run crosswise to one another (in the figure, this is parallel to see spacers 32 extending to the plane of the drawing).
  • a connecting line 34 (gas-tight connection) runs in the center from the bottom 26, via which an inert gas such as argon can be blown into the pressure chamber 30 and there through the channels 16. The gas flow runs through the lower, front opening of the channels 16 through the channels 16 to the opposite, upper front end 36 and from there into the molten metal (not shown).
  • the gas connection for line 34 is made in a known manner.
  • the sink 10 is used in a suitable manner in the bottom or the wall of the metallurgical melting vessel, for example in a perforated stone or via a perforated stone sleeve.
  • a passage 38 Concentric to the central longitudinal axis of the sink 10 is arranged in this a passage 38, which can either be drilled out or formed by a metal or dense refractory tube.
  • the passage channel 38 runs from the upper end face 36 to the lower end face 24 and continues from there in a connecting line 40 which in the first part runs concentrically to the connecting line 34 and then passes through it in a gastight manner.
  • a copper line 43 which forms a ring line with a supply line 42 and a discharge line 44, extends helically around the passage channel. It is obvious that cooling air supplied via the supply line 42 is helical due to the forced guidance around the passage channel 38 up to the upper end 36 of the molded body flows and from there back to the discharge line 44 and due to the tight order Closure of the passage 38 causes a high cooling effect.
  • a valve 46 is arranged somewhat above the lower end face 24 in the course of the passage 38. This consists of a chamber 48 widening on both sides of the passage 38, which has approximately a kidney shape in the sectional drawing, which extends from a section directly above the inlet opening of the passage line 38 at 50 offset laterally into the refractory ceramic.
  • a ball 52 Arranged within the chamber 48 is a ball 52 which, in the illustration according to the drawing, lies directly on the inlet opening of the passage channel 38 at 50 and seals it.
  • the design of the chamber 48 is such that when a specific gas pressure is applied, the ball 52 is pushed away from its sealing position at 50 and is guided out of engagement with the passage channel 38 into the position 54 shown in dashed lines in the figure along a constrained guide indicated by the arrow. whereby the path of the passage 38 is completely cleared.
  • valve 46 it is also possible to design the area marked with dash-dotted lines around the valve 46 as a separate component (this component 56 itself may in turn consist of two halves) and it will be inserted (mortared in) in the correspondingly drilled or recessed matrix material of the molded body 10 ).
  • argon for example
  • a gas reservoir which is also not shown, argon, for example
  • the gas flow when the ball 52 is reached, leading it away from the closed position into the upper position shown in broken lines in the figure, the cross section of the passage 38 is released.
  • the gas then continues to flow through the channel 38 into the molten metal.
  • a powdery or granular additive such as lime or the like, is blown into the feed line 40 and in the same way fed through the channel 38 into the melt.
  • the ball 52 When falling below a certain flow rate of the solid or gas guided through the channel 38, the ball 52 falls back into its closed position at 50 and thus seals the channel 38 downward.
  • cooling line 43 Due to the arrangement of the cooling line 43 it can be achieved that any metal melt which has penetrated solidifies much earlier, namely in the region of the upper end face 36, and thus further penetration of metal melt is prevented.
  • the copper line 43 also offers a safety function, namely if the upper region 12 of the sink is eroded to a certain depth, the metal melt reaches the copper line 43 and melts it; at the same time, the pressure in the lines 42, 44 drops, which can be registered by a corresponding display device.
  • the metallic conductivity of the copper material can also be used to connect corresponding residual strength display devices, as described, for example, in German Offenlegungsschriften 3,424,466 or 3,503,221.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Nozzles (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Inorganic Insulating Materials (AREA)
  • Insulators (AREA)
  • Building Environments (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Claims (15)

1. Tuyère réfractaire en céramique avec au moins un canal d'admission (38) pour le passage de gaz et/ou de matière solide dans le bain de fusion d'un récipient métallurgique, le canal d'amission (38) aboutissant par une extrémité ouverte dans une surface (36) de la tuyère (10) tournée vers le bain de fusion et pouvant être raccordé à son extrémité opposée à une conduite de gaz et/ou de matière solide (40) et une vanne (46) étant placée dans le canal d'admission (38), caractérisée en ce que la vanne (46) entoure un corps de fermeture (52) bouchant le canal d'admission (28) dans sa position de départ (sans conduction de gaz ou de matière solide) qui, lorsqu'un flux de gaz et/ou de matière pouvant être prédéfini est atteint, peut être écarté de sa position de fermeture et qui débloque le canal d'admission (38).
2. Tuyère selon la revendication 1, caractérisée en ce que le corps de fermeture (52) est une bille qui peut être guidée le long d'un trajet de déplacement hors du canal d'admission (38).
3. Tuyère selon la revendication 1 ou 2, caractérisée en ce que la vanne est disposée en tant qu'élément de construction séparé dans la tuyère.
4. Tuyère selon l'une des revendications 1 à 3, caractérisée en ce que le corps de fermeture (52) et/ou la vanne (46) est constitué en une matière céramique réfractaire très résistante à l'abrasion, par exemple en Zr02 ou en Ti02.
5. Tuyère selon l'une des revendications 1 à 4, caractérisée en ce que le canal d'admission (38) traverse la tuyère (10) de son extrémité du côté du raccord à son extrémité ouverte opposée.
6. Tuyère selon l'une des revendications 1 à 5, caractérisée en ce que le canal d'admission (38) a un diamètre entre 2 et 10 mm, de préférence entre 4 et 6 mm.
7. Tuyère selon l'une des revendications 1 à 6, caractérisée en ce que la pièce qui entoure le canal d'admission (38) est configurée comme une tuyère de soufflage de gaz conventionnelle.
8. Tuyère selon l'une des revendications 1 à 7, caractérisée en ce que le canal d'admission (38) peut être refroidi par un dispositif de refroidissement (43) au moins à son extrémité tournée vers le récipient de fusion.
9. Tuyère selon la revendication 8, caractérisée en ce que le dispositif de refoidissement se compose d'une conduite de refroidissement (43) pouvant être traversée par du liquide ou du gaz et placée en étant directement contiguë au canal d'admission (38).
10. Tuyère selon la revendication 8 ou 9, caractérisée en ce que la conduite de refroidissement (43) aboutit avec la portion opposée à l'extrémité du côté du raccord dans la surface (36) de la tuyère (10).
11. Tuyère selon la revendication 9 ou 10, caratéri- sée en ce que la conduite de refroidissement (43) enveloppe le canal d'admission (38) en spirale.
12. Tuyère selon l'une des revendications 8 à 11, caractérisée en ce qué la conduite de refroidissement (43) est une conduite en cuivre.
13. Tuyère selon l'une des revendications 1 à 12, caractérisée par un dispositif de sécurité contre la rupture et/ou un dispositif d'indication de l'épaisseur résiduelle supplémentaire.
14. Tuyère selon l'une des revendications 1 à 13, caractérisée en ce que le canal d'admission (38) est configuré comme un siphon.
15. Procédé pour insuffler des adjuvants solides, pulvérulents ou granuleux dans un bain de fusion par l'intermédiaire d'une tuyère selon l'une des revendications 1 à 14, avec les étapes suivantes:
a) Insufflation d'un gaz inerte et/ou d'un flux de matière solide dans le canal d'admission (38), ce qui implique l'ouverture de la vanne (46);
b) Purge d'au moins un adjuvant dans le canal d'admission (38), de préférence soutenue par un flux de gaz inerte;
c) le cas échéant, ensuite coupure du flux d'adjuvant et poursuite de l'insufflation de gaz inerte pur;
d) coupure de l'arrivée de gaz inerte et/ou de matière solide jusqu'à la fermeture de la vanne (46).
EP88104933A 1987-05-27 1988-03-26 Pièce moulée réfractaire en matériau céramique Expired - Lifetime EP0292670B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104933T ATE54948T1 (de) 1987-05-27 1988-03-26 Feuerfester keramischer formkoerper.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717840 1987-05-27
DE19873717840 DE3717840A1 (de) 1987-05-27 1987-05-27 Feuerfester keramischer formkoerper

Publications (3)

Publication Number Publication Date
EP0292670A2 EP0292670A2 (fr) 1988-11-30
EP0292670A3 EP0292670A3 (en) 1989-06-28
EP0292670B1 true EP0292670B1 (fr) 1990-07-25

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EP88104933A Expired - Lifetime EP0292670B1 (fr) 1987-05-27 1988-03-26 Pièce moulée réfractaire en matériau céramique

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US (1) US4884787A (fr)
EP (1) EP0292670B1 (fr)
AT (1) ATE54948T1 (fr)
DE (2) DE3717840A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938461A (en) * 1989-06-02 1990-07-03 Zedmark Refractories Corp. Device for distributing gas into molten metal
US5249778A (en) * 1992-04-14 1993-10-05 Dolomitwerke Gmbh Gas stir plug device with visual wear indicator

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1130736A (fr) * 1955-07-05 1957-02-11 Siderurgie Fse Inst Rech Procédé d'insufflation de gaz et de matières pulvérulentes dans les métaux fondus et dispositif pour le mettre en oeuvre
FR1243414A (fr) * 1959-02-27 1960-10-14 Air Liquide Procédé d'affinage des fontes phosphoreuses par l'oxygène concentré
NL296346A (fr) * 1962-08-07
DE1232603B (de) * 1964-06-04 1967-01-19 Normandie Ste Metallurgique Verschlussvorrichtung fuer eine OEffnung zum Einfuehren von Brennstoff in eine Heisswind-Blasform eines Hochofens
US3819165A (en) * 1972-12-08 1974-06-25 Maximilianshuette Eisenwerk Device for blowing-in oxygen through the refractory lining of a metallurgical converter
US4023781A (en) * 1973-05-12 1977-05-17 Eisenwerk-Gesellschaft Maximilianshutte Mbh Tuyere for metallurgical vessels
US4036481A (en) * 1973-06-14 1977-07-19 Pennsylvania Engineering Corporation Steel converter vessel tuyere block construction
SE392479B (sv) * 1974-03-20 1977-03-28 Asea Ab Forma vid metallurgiska konvertrar och smeltugnar
GB2041182B (en) * 1978-12-21 1983-01-26 Kawasaki Steel Co Method for blowing gas from below into a molten steel in refining vessel
SE426846B (sv) * 1981-06-04 1983-02-14 Stal Laval Apparat Ab Forma eller dysa for inblasning av gas- vetske-eller pulverformigt material i metalliska smeltor sasom stalsmeltor
US4470582A (en) * 1982-02-15 1984-09-11 Zirconal Processes Limited Introduction of substances into molten metal
AT386072B (de) * 1983-07-18 1988-06-27 Radex Deutschland Ag Feuerfester stein, insbesondere gasspuelstein
DE3341446C1 (de) * 1983-11-17 1985-07-11 Brohltal-Deumag AG für feuerfeste Erzeugnisse, 5401 Urmitz Gasspuelstein fuer metallurgische Gefaesse
DE3505821C1 (de) * 1985-02-20 1986-08-07 Didier-Werke Ag, 6200 Wiesbaden Huelse zum Einblasen von Feststoffen in eine Metallschmelze
JPS61195910A (ja) * 1985-02-27 1986-08-30 Sumitomo Metal Ind Ltd 羽口構造
DE3520207C2 (de) * 1985-06-05 1987-04-09 Didier-Werke Ag, 6200 Wiesbaden Düsenanordnung zum Einblasen von Gasen oder Feststoffen in eine eine Metallschmelze enthaltende Pfanne
GB2175830B (en) * 1985-06-07 1988-07-20 Labate Michael D Device for introducing gas into a mass of molten metal in a container
DE3527793A1 (de) * 1985-08-02 1987-02-12 Esb Schweissbetrieb Burbach & Verfahren zur montage eines fuer metallurgische gefaesse vorgesehenen gasspuelsteins
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DE8622299U1 (de) * 1986-08-20 1986-10-02 Plibrico Co GmbH, 4000 Düsseldorf Tauchlanze
DE8626930U1 (de) * 1986-10-10 1986-11-20 Wiberol chemisch-technische Produkte GmbH, 4630 Bochum Blaslanze zur Behandlung von Metallschmelzen

Also Published As

Publication number Publication date
ATE54948T1 (de) 1990-08-15
US4884787A (en) 1989-12-05
DE3860359D1 (de) 1990-08-30
EP0292670A3 (en) 1989-06-28
DE3717840A1 (de) 1988-12-15
DE3717840C2 (fr) 1989-03-09
EP0292670A2 (fr) 1988-11-30

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