EP0844310B1 - Schlackenabstreifanlage für die Rüssel eines Vakuumbehandlungsgefässes für Stahlschmelzen - Google Patents

Schlackenabstreifanlage für die Rüssel eines Vakuumbehandlungsgefässes für Stahlschmelzen Download PDF

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Publication number
EP0844310B1
EP0844310B1 EP97402772A EP97402772A EP0844310B1 EP 0844310 B1 EP0844310 B1 EP 0844310B1 EP 97402772 A EP97402772 A EP 97402772A EP 97402772 A EP97402772 A EP 97402772A EP 0844310 B1 EP0844310 B1 EP 0844310B1
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EP
European Patent Office
Prior art keywords
fingers
nozzles
deskulling
frame
installation according
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
EP97402772A
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English (en)
French (fr)
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EP0844310A1 (de
Inventor
Patrick Tassot
Patrick Lebacon
Bernard Fournier
Jean-Claude Lecas
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Prosertec
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Prosertec
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0054—Means to move molten metal, e.g. electromagnetic pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • the subject of the present invention is a scouring installation of divers from a tank vacuum treatment of liquid steel.
  • a tank connected to a pumping means and provided, at its lower part, two vertical divers and parallel, each with an internal channel ensuring communication between the internal part of the tank and the outside of said tank.
  • Liquid steel treatment is carried out by putting the liquid steel in a pocket, then immersing the plungers in liquid steel, pumping the atmosphere inside the tank which causes the liquid steel to rise through the channels of divers in the tank and by injecting a gas into one of the channels thus causing intense circulation of liquid steel in the divers' channels.
  • the behavior of the refractory material divers is essential to the quality of the metallurgical treatment and a deficiency in this area often leads to a loss of efficiency in terms of rate liquid steel recirculation and therefore a loss sensitive productivity.
  • the first technique consists in carrying out the scouring from the ground using a shovel striking the refractory material and the gangue deposited when the height of the divers from the floor is low enough.
  • the second technique consists in carrying out the scouring from a work platform and at means of a set of struts if the distance between divers and the work floor is too large.
  • the gunning is done the most often from a cart and using a lance manual projection.
  • Document JP-A-62151260 describes an installation cleaning of tubular divers made of refractory material a liquid steel vacuum treatment tank comprising a tank bottom supporting the plungers arranged vertically and delimiting between them an intermediate space.
  • This installation includes a movable frame horizontally and vertically, comprising, in its part upper, means for simultaneously scraping the surface external of the vacuum treatment tank plungers.
  • the object of the invention is to propose an installation mechanical cleaning of divers from a tank treatment of the liquid steel which allows to act quickly and regularly on the still hot fouling matrix, therefore flowable and limit the uncontrolled growth of this gangue, while avoiding that the operators are found in the risk zone.
  • the subject of the invention is therefore an installation cleaning of tubular divers made of refractory material a liquid steel vacuum treatment tank comprising a bottom of the tank supporting the arranged divers vertically and delimiting between them an intermediate space, the installation including a movable frame horizontally and vertically and comprising at its part upper scraping means from bottom to top and simultaneous of the external surface of said plungers, characterized in that the scraping means are formed, for each of said divers, by rakes fitted with scouring fingers, distributed along a circumference and movable by actuation means between a position retracted in which the fingers of the rakes are spread of the outer surface of the divers and an active position in which the fingers of the rakes are in contact with the external surface of said plungers and in that each rake is formed by a crossbar with supports scouring fingers and a longitudinal handle extending perpendicular to said bar, a first end of the handle being connected to the bar and a second end of this handle being secured to a transverse axis pivot
  • a liquid steel vacuum treatment tank designated as a whole by the reference 1 and which includes a bell-shaped top 2, a ferrule intermediate 3 and a tank bottom 4.
  • the top of the tank 2 has a first stitching 5 on which is mounted an addition airlock 6 and a second tap 7 connected by a pipe to a pumping device, not shown.
  • the top of the tank 2, the intermediate shell 3 and the bottom of the tank 4 each has an envelope metal 8 and a coating 9 of refractory material.
  • the bottom of the tank 4 is provided with jambs, 10 and 11 respectively, on which two are mounted plungers, respectively 12 and 13, also made of material refractory and which delimit two channels, respectively 14 and 15, ensuring communication between the party internal of the tank and the outside of said tank.
  • a diver for example the diver 12 comprises a transverse conduit, not shown, intended the introduction of an inert gas into the corresponding channel.
  • Liquid steel treatment is carried out by putting the liquid steel in a pocket, then plunging the plungers 12 and 13 of the tank 1 into liquid steel, by pumping the atmosphere contained in inside the tank 1 which causes the rise of liquid steel through channels 14 and 15 in this tank 1 and an intense circulation of the liquid steel in the channels 14 and 15.
  • the scrub installation in accordance with the invention makes it possible to remove this gangue of fouling deposited on divers 12 and 13 as well as in the intermediate space 16 between said plungers 12 and 13.
  • FIGs 2 and 3 there is shown schematically a scrub installation 20 of the outer surface of divers 12 and 13 and which includes a frame 21 movable horizontally and vertically.
  • the frame 21 is equipped with means for horizontal movement to bring this frame 21 below divers 12 and 13 and which consist of a carriage 22 on which said frame 21 is disposed.
  • the carriage 22 can be moved horizontally by means of wheels 23 which cooperate with rails, not represented.
  • the carriage 22 is movable at large and at low speed to bring the frame 21 below the divers 12 and 13 and fine-tune the positioning of the frame 21 relative to these divers.
  • the frame 21 is equipped with means vertical displacement.
  • This frame 21 which has a generally parallelepiped shape has, on its lateral uprights, rollers 24 which cooperate with vertical rails 25.
  • the lateral uprights 25 of the frame 21 are provided with cylinders 26, for example hydraulic, whose control rods are supported on the carriage 22 to vertically move the frame 21, as will be seen later.
  • the frame 21 comprises, at its upper part, scraping means 30 from bottom to the top and simultaneous of the external surface of each diver 12 and 13.
  • the frame 21 also includes, at its upper part, means 50 for scouring the intermediate space 16 between the plungers 12 and 13.
  • the scraping means 30 are formed by rakes 31 provided of scouring fingers 32 and distributed according to a circumference so as to substantially cover the part accessible from the external surface of the corresponding plunger.
  • Each rake 31 is movable by actuation means which will be described later, between a retracted position in which the fingers 32 of these rakes 31 are moved away from the external surface divers 12 and 13 and an active position in which the fingers 32 of these rakes 31 are in contact with the external surface of said plungers 12 and 13.
  • each rake 31 is movable by pivoting between the two positions.
  • each rake 31 can be movable by longitudinal sliding between the two positions.
  • each rake 31 is formed, of a part, by a crossbar 33 comprising supports 34 of the scrub fingers 32 regularly distributed over said crossbar 33 and, on the other part, by a longitudinal handle 35 extending perpendicularly to said crossbar 33.
  • each rake 31 has three scouring fingers 32.
  • each rake 31 can have a higher number of scrub fingers 32 or inside three and each rake 31 can have a different number of scouring fingers 32 in depending on the area of the diver to be covered and the dimension of this diver.
  • each support 34 includes lights 36 for the passage of fixing bolts 37 of a scouring finger 32 on the corresponding support 34.
  • each rake 31 has a first end 35a connected to the crossbar 33 of the corresponding rake 31 and a second end 35b integral with a transverse axis 38 of pivoting of the rake 31.
  • each rake 31 is connected to actuating means for moving the rake 31 as well as the scouring fingers 32 between the two positions.
  • each rake 31 includes a jack 39 for example hydraulic comprising a body 39a pivotally mounted on an axis 40 connected by fixing elements on the frame 21 and a control rod 39b whose free end is pivotally connected to the transverse axis 38 of the sleeve 35 corresponding, by at least one link 41.
  • a jack 39 for example hydraulic comprising a body 39a pivotally mounted on an axis 40 connected by fixing elements on the frame 21 and a control rod 39b whose free end is pivotally connected to the transverse axis 38 of the sleeve 35 corresponding, by at least one link 41.
  • control rod 39b of the cylinder 39 is connected to the transverse axis 38 by two rods parallel 41 connected to each other by a flange 45 (Figs. 4 and 6).
  • Each set formed by a rake 31, a transverse axis 38, a jack 39 and an axis 40 is connected to the frame 21 by support elements formed for example by flanges, respectively 46, 47 and 48 (Figs. 5 and 6).
  • Each scouring finger 32 forms with horizontal an angle between 30 and 60 ° when the rake 31 is in the active position.
  • These scouring means 50 are formed by at least two opposing and movable scouring fingers 51 horizontally.
  • Each scouring finger 51 of the space intermediate 16 is movable by actuation means between a retracted position in which the scouring fingers 51 are separated from the intermediate space 16 and an active position in which the fingers scrub 51 are in quasi-contact one against the other and are positioned in said intermediate space 16.
  • Each scouring finger 51 is mounted on a support 52 secured to a rod 53 connected to the means actuation.
  • the support 52 of the scouring finger 51 includes lights, not shown, for passing bolts 54 for fixing the scouring finger 51 to its support 52.
  • the rod 53 is slidably mounted in a supported sheath 54 by the frame 21.
  • each finger scouring 51 are formed by a jack 55 for example hydraulics which conventionally includes a firstly, a body 55a connected to the frame 21 and, secondly, a control rod 55b connected by its free end to rod 53.
  • each scouring finger 51 can be moved by pivoting between the two positions.
  • the frame 21 is equipped at its upper part a hopper 17 which allows to channel the fouling gangue detachment of divers 12 and 13 by the fingers scrub 32 and 51 in a collecting tank, not shown, arranged at the base of this frame 21.
  • This recovery tray is removable and can be emptied by means of a handling device.
  • the scouring fingers 32 and 51 are by example in high temperature abrasion resistant steel.
  • the operator commands through, for example a remote control, the movement of the assembly by the frame 21 and the carriage 22 to bring with precision this frame 21 below the plungers 12 and 13.
  • Rakes 31 means 30 for cleaning are in the raised position, as shown in lines mixed in FIG. 4, and the scouring fingers 51 means 50 for cleaning the intermediate space 16 are in the retracted position.
  • the operator controls the rise of the frame 21 by means of the jacks 26 so that this frame 21 moves vertically on the rails 25 and that the rakes 31 of the scrubbing means 30 come position at the bottom of the divers 12 and 13.
  • the operator controls the rams 39 of the rakes 21 which has the effect to tilt these rakes 31 around the transverse axis 38 in the active position so that the scouring fingers 32 are positioned against the fouling matrix deposited on the external surface divers 12 and 13.
  • the operator actuates the jacks 26 which gradually lift the frame 21 so that the fingers scrub 32 scrape from bottom to top gangue fouling deposited on divers 12 and 13.
  • the cleaning of divers 12 and 13 by fingers 32 is therefore carried out from the bottom up which allows to maintain the refractory material constituting these compression divers.
  • refractory materials have a ten times greater resistance in compression by compared to traction.
  • the surface scrub operation external of divers 12 and 13 can be performed in one or several passes depending on the importance of the thickness of gangue.
  • the rakes 31 are raised between each pass and each cleaning pass is carried out from the bottom to the top so as to hold the refractory material of these plungers 12 and 13 in compression.
  • the number of scouring fingers 32 is depending on the diameter of divers 12 and 13. In the case divers from 500 to 750mm in diameter, the number of scouring fingers 32 per plunger is nine or twelve. For smaller divers, six fingers scouring is sufficient.
  • the operator actuates the jacks 55 so that the fingers scrub 51 moves horizontally and are positioned in the intermediate space 16, as shown in figure 3.
  • the operator actuates the jacks 26 so as to lower the frame 21 which also causes the descent of the scouring fingers 51 over all the height of the intermediate space 16 between the divers 12 and 13.
  • the gangue of fouling taken off by divers 12 and 13 is funneled through the hopper 17 and falls in the recycling bin.
  • All the installation operations of scouring is carried out from a central control such as a radio control and / or a console arranged on the carriage 22 and the scouring of the divers 12 and 13 is completed in two or three minutes from from the moment the positioning of the scrub fingers is judged as correct by the operator according to the fouling rate encountered.
  • a central control such as a radio control and / or a console arranged on the carriage 22 and the scouring of the divers 12 and 13 is completed in two or three minutes from from the moment the positioning of the scrub fingers is judged as correct by the operator according to the fouling rate encountered.
  • the scrub installation according to the invention allows rapid operation at high temperatures in a temperature zone where the gangue is still subject creep which makes it easier to detach, while giving the operator working conditions greatly improved.
  • the descaling operation being carried out simultaneously at the divers' level, the intervention time is fast which allows for a gunning of the external and internal surfaces of the divers 12 and 13 by means of a suitable machine and drying of the gunning product before reuse of the tank vacuum treatment.
  • the frame 21 of the installation of scouring can also be fitted with lances gunning which allow to project a product on external and internal surfaces of divers 12 and 13.
  • each rake 31 in relation to the external surface of the divers 12 and 13 and the positioning of the scrub fingers 51 of the intermediate space 16 are adjustable as a function of the thickness of the fouling matrix and this by acting separately on the stroke of the cylinders 39 of positioning of rakes 31 and cylinders 55 of positioning of the scrub fingers 51.
  • each finger scouring 32 and 51 on its corresponding support 34 and 52 is adjustable according to the wear of these fingers cleaning.
  • each rake 31 is adjustable according to this ovalization.
  • the installation according to the invention makes it possible to extend the service life of refractory material constituting the plungers of the treatment tank and ability to perform different operations in a way safe and fast and improve working conditions operator.
  • the frequency of operations of scouring can be increased for productivity of the vacuum treatment tank.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Coating With Molten Metal (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Claims (14)

  1. Vorrichtung zur Entfettung von rohrförmigen Tauchkolben (12,13) aus feuerfestem Material eines Fasses (1) zur Unterdruckbehandlung von flüssigem Eisen, aufweisend eine Fassunterseite, der die Tauchkolben (12, 13) trägt, die vertikal angeordnet sind, und in bezug aufeinander einen Zwischenraum (16) festlegen, wobei die Vorrichtung ein Gestell (21) aufweist, das horizontal und vertikal verschiebbar ist, und an seinem oberen Ende eine Einrichtung (30) zum Abschaben der Unterseite in Richtung nach oben aufweist, und gleichzeitig der Außenseite der Tauchkolben (12, 13), dadurch gekennzeichnet, dass die Einrichtung zum Abschaben für jeden der Tauchkolben (12, 13) durch mit Entfettungszapfeh (32) versehenen Aushebern (31) gebildet sind, die um den Umfang verteilt und durch eine Betätigungseinrichtung (39, 41) zwischen einer eingezogenen Position, in welcher die Zapfen (32) der Ausheber (31) von der Außenseite der Tauchkolben (12, 13) beabstandet sind und einer aktiven Position verschiebbar sind, in welcher die Zapfen (32) der Ausheber (31) sich im Kontakt mit der Außenseite der Tauchkolben (12, 13) befinden, und dass jeder Ausheber (31) durch eine Querstange (33) gebildet ist, die Träger (34) für die Entfettungszapfen (32) umfasst, und durch eine längliche Haltestange (35), die sich senkrecht zu der Stange (33) erstreckt, wobei ein erstes Ende (35a) der Haltestange (35) mit der Stange (33) verbunden ist, und wobei ein zweites Ende (35b) dieser Haltestange (35) mit einer Schwenkquerachse (38) des Aushebers (31) fest verbunden ist, die mit einer Betätigungseinrichtung (39, 41) verbunden ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Rahmen (21) auf seiner Oberseite eine Einrichtung (50) zum Entfetten des Zwischenraums (16) zwischen den Tauchkolben (12, 13) umfasst.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Rahmen (21) mit einer Einrichtung (22, 23) zur horizontalen Verschiebung zur Mitnahme des Rahmens (21) unter den Tauchkolben (12, 13) versehen ist.
  4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Rahmen (21) mit einer Einrichtung (24, 25, 26) zur vertikalen Verschiebung zur Mitnahme der Abschabeinrichtung (30) auf Höhe der Kolben (12, 13) versehen ist.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeder Ausheber (31) durch eine Längsgleitverschiebung zwischen den beiden Position verschiebbar ist.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeder Ausheber (31) durch Verschwenkung zwischen den zwei Position verschiebbar ist.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Betätigungseinrichtung für das Verschwenken von jedem Ausheber (31) einen Kolben (39), beispielsweise einen Hydraulikkolben umfasst, der einen Körper (39a) aufweist, der schwenkend auf einer Achse (40) angebracht ist, und eine Steuerstange (39b), deren freies Ende mit einer Querachse (38) der entsprechenden Haltestange durch mindestens einen Schwingarm (41) verbunden ist.
  8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeder der Entfettungszapfen (32) mit der Horizontalen einen Winkel zwischen 30 und 60° bildet.
  9. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Einrichtung (50) zum Entfetten des Zwischenraums (16) zwischen den Tauchkolben (12, 13) zumindest zwei Entfettungszapfen (51) umfasst, die einander gegenüberliegen und mittels einer Betätigungseinrichtung (55) zwischen einer eingefahrenen Position, in welcher die Entfettungszapfen (51) außerhalb des Zwischenraums (16) zuliegen kommen, und einer aktiven Position verschiebbar sind, in welcher die Entfettungszapfen (51) in dem Zwischenraum (16) zu liegen kommen.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass jeder Entfettungszapfen (51) des Zwischenraums (16) auf einem Träger (52) angebracht ist, der gleitend durch eine Gleithülse (54) einer Stange (53) verschiebbar ist, die mit einer Betätigungseinrichtung (55) verbunden ist.
  11. Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Position von jedem Entfettungszapfen (32, 51) auf dem Träger (54, 52) einstellbar ist.
  12. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Rahmen (51) auf seiner Oberseite einen Trichter (17) umfasst.
  13. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Rahmen (21) eine Wanne zum Rückgewinnen von Entfettungsmasse aufweist, die von dem Tauchkolben (12, 13) entfernt wurde.
  14. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Rahmen (21) auf den Außen- und Innenseiten der Tauchkolben (12, 13) Gunitierungslanzen versehen ist.
EP97402772A 1996-11-22 1997-11-18 Schlackenabstreifanlage für die Rüssel eines Vakuumbehandlungsgefässes für Stahlschmelzen Expired - Lifetime EP0844310B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614326 1996-11-22
FR9614326A FR2756200B1 (fr) 1996-11-22 1996-11-22 Installation de decrassage des plongeurs d'une cuve de traitement sous vide de l'acier liquide

Publications (2)

Publication Number Publication Date
EP0844310A1 EP0844310A1 (de) 1998-05-27
EP0844310B1 true EP0844310B1 (de) 2001-10-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402772A Expired - Lifetime EP0844310B1 (de) 1996-11-22 1997-11-18 Schlackenabstreifanlage für die Rüssel eines Vakuumbehandlungsgefässes für Stahlschmelzen

Country Status (5)

Country Link
EP (1) EP0844310B1 (de)
AT (1) ATE206768T1 (de)
DE (1) DE69707245T2 (de)
ES (1) ES2166963T3 (de)
FR (1) FR2756200B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20022375U1 (de) * 2000-06-09 2001-08-09 SMS Mevac GmbH, 45141 Essen Rüsselreinigungseinrichtung für Vakuumentgasungsanlagen
DE102007040882A1 (de) * 2007-08-29 2009-03-05 Sms Mevac Gmbh Reinigungsvorrichtung für Tauchrohre bzw. Rüssel von Vakuumentgasungsanlagen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819446A (ja) * 1981-07-25 1983-02-04 Nisshin Steel Co Ltd Ｒｈ炉等におけるスラグ除去装置
GB8331152D0 (en) * 1983-11-22 1983-12-29 Henderson & Co Ltd John M Vessel nozzle cleaning apparatus
JPS62151260A (ja) * 1985-12-25 1987-07-06 Kobe Steel Ltd 溶湯浸漬管の付着物除去装置
JPH0632842B2 (ja) * 1989-04-28 1994-05-02 黒崎窯業株式会社 溶湯処理装置における浸漬管の付着物除去装置
JPH0645820B2 (ja) * 1989-12-28 1994-06-15 黒崎窯業株式会社 真空脱ガス設備の溶鋼吸上管の除滓装置

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Publication number Publication date
DE69707245D1 (de) 2001-11-15
DE69707245T2 (de) 2002-06-27
FR2756200A1 (fr) 1998-05-29
FR2756200B1 (fr) 1999-04-02
ES2166963T3 (es) 2002-05-01
ATE206768T1 (de) 2001-10-15
EP0844310A1 (de) 1998-05-27

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