EP0514383B1 - Procede et installation de reconstitution du revetement refractaire de poches de coulee - Google Patents

Procede et installation de reconstitution du revetement refractaire de poches de coulee Download PDF

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Publication number
EP0514383B1
EP0514383B1 EP91901674A EP91901674A EP0514383B1 EP 0514383 B1 EP0514383 B1 EP 0514383B1 EP 91901674 A EP91901674 A EP 91901674A EP 91901674 A EP91901674 A EP 91901674A EP 0514383 B1 EP0514383 B1 EP 0514383B1
Authority
EP
European Patent Office
Prior art keywords
lining
ladle
slag
old
refractory
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
EP91901674A
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German (de)
English (en)
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EP0514383A1 (fr
Inventor
Wilhelm Eitel
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.)
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Original Assignee
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
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Application filed by Intocast GmbH Feuerfestprodukte und Giesshilfsmittel filed Critical Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Publication of EP0514383A1 publication Critical patent/EP0514383A1/fr
Application granted granted Critical
Publication of EP0514383B1 publication Critical patent/EP0514383B1/fr
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • B22D41/023—Apparatus used for making or repairing linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
    • F27D1/1694—Breaking away the lining or removing parts thereof

Definitions

  • the invention relates to a method of the type corresponding to the preamble of claim 1 and a system according to the preamble of claim 2.
  • metallurgical vessels have been increasingly no longer lined with refractory bricks, but with the help of a casting technique in which the space between a template or shape that determines the desired clear interior of the pan or other metallurgical vessel is determined. and a mostly thixotropic fireproof casting compound is filled into the vessel wall to be delivered, which, due to its thixotropic behavior, is very free-flowing under the influence of vibrations (usually the template or shape) even at low water contents and fills every cavity.
  • the tools follow the large contours of the old infeed.
  • the template is again introduced into the metallurgical vessel with the old delivery cleaned in this way, whereupon the space between the template and the old delivery is filled again with thixotropic casting compound under the action of vibrations. In this way, up to 50% of the expensive delivery material can be saved.
  • the previous treatment of the surface of the old inlay results in a good bond to the newly applied refractory mass.
  • the invention has for its object to be able to restore the refractory lining of metallurgical vessels in an economical manner even in such cases.
  • a high-temperature burner with a water-cooled lance which can be moved up and down and rotated, can be moved on rails in the depth direction of the pan, so that the burner can be guided spirally and helically at a suitable distance over the inner surface of the pan.
  • the burner works with gas or oil and oxygen and can be operated in such a way that it works in a reducing manner, ie it does not develop brown fumes.
  • the burner lance can be guided in a circle so that the adhering slag, slag steel mixtures or steel residues become highly liquid in the floor and wall area and flow out of the inclined lower area of the pan from its mouth to the outside, where it flows into a slag bucket or get into a sand bed. In this way, the pan is cleaned within a few minutes.
  • All that remains on the old refractory lining is a thin, glass-like, smooth slag coating, which is roughened mechanically after the pan has cooled down in order to achieve a good primer for the new lining material.
  • the roughening can be done by the above-mentioned slag peeling robot, which partially or completely removes the slag layer and in any case leaves a rough surface of the old delivery.
  • the template is then reinserted into the pan according to the method already known and the space between the template and the surface of the remaining lining is filled with new casting compound.
  • the infeed can be restored in the shortest possible time without great mechanical stress on the permanent feed and without extensive stripping work.
  • a burner operated with oxygen has flame temperatures in the range of 3000 ° C.
  • the one in the pan Remaining materials to be removed, such as slag, flake steel mixtures or steel residues, have melting points in the range from approximately 1000 to 1500 °.
  • the temperature of the pan is still very high from the last pour, so that the burner does not have to heat the pan from ambient temperature. Rather, the burner only has to generate the last temperature peak in order to liquefy the total amount of undesirable constituents adhering to the surface, which is accomplished in a short time.
  • burners come into consideration which have features of DE-PS 15 29 201 and 31 51 479 in particular with regard to the burner nozzle.
  • the roughening device is used, which is known from DE-OS 37 41 073.
  • A reveals a freshly delivered ladle 10, which consists of a pot-shaped housing 1 made of sheet steel that tapers slightly downwards, on the inside of which a so-called delivery or lining made of refractory material is applied, essentially of a constant thickness of a few 10 centimeters.
  • the pan 10 can be gripped and displaced by the overhead crane on side lugs 3 in the upper region.
  • the steel is subjected to a metallurgical treatment, for example by blowing in oxygen, argon or the like, and then poured off.
  • a metallurgical treatment for example by blowing in oxygen, argon or the like, and then poured off.
  • the slag is poured off and the delivery of the pan 10 looks as indicated in B.
  • the infeed is beared, ie thick slag layers or beads have set up, as is indicated by the cross-hatching that represents the slag S.
  • Steel residues or steel slag mixtures can also be present.
  • Thinner slag layers also adhere in the areas 2 ′ or the surface areas of the infeed 2 of slag are penetrated to a certain depth, which reduces their fire resistance.
  • the coarse beads on the upper edge of the pan are broken out with a suitable device, and the pan is then placed with the indoor crane lying on a stand 4 located nearby, that is to say as long as the delivery 2 is still glowing bright red from the last cast , so that the wall of the infeed 2 in its essentially cylindrical region makes an angle 5 of approximately 5 to 30 ° with the horizontal, the inclination being reproduced particularly strongly in the schematic representation of the exemplary embodiment.
  • the opening 6 of the pan 10 points downwards.
  • a carriage or carriage 7 is now brought up on rails, which carries a lance 8 with a high-temperature burner at the free end, which can be inserted into the interior of the pan 10 and can be pivoted both in the direction of arrow 11 and in the direction of arrow 12 as can also be moved into the pan 10 in the direction of arrow 13 in the longitudinal direction of the lance.
  • the carriage or carriage 7 also carries a heat shield 14, which covers the opening 6 of the pan 10.
  • the high-temperature burner 9 is operated with a suitable gaseous or liquid fuel and pure oxygen and generates flame temperatures in the range of 3000 ° C., which melts the still red-hot slag, the melting point of which is in the range of 1000-1500 ° C. the heat shield 14 avoids heat losses and prevents excessive radiation on the carriage 7.
  • the melted slag flows downward from the opening 6 of the pan 10 in the direction of the arrows 15 into the slag bucket 16.
  • the pan 10 has the opportunity to cool between phase C and phase D.
  • the pan is placed in a pit 17 by means of the indoor crane.
  • the slag robot 20 comprises a machine frame 18 which projects over the pan 10 and on which a vertical column 19 can be raised and lowered in the direction of the arrow 21 and rotatable about its longitudinal axis in the direction of the arrow 25.
  • pivotable arms 22 are attached, at the free ends of which rotatable tools 23 are provided in the form of castors studded with hard metal pins 24, which follow the contour of the inner surface of the infeed 2 and under the action of vibrators a hammering attack Execute the slag layer and remove or at least roughen it without significantly changing the relief of the inner surface 26 and removing a lot of the healthy material of the delivery 2.
  • phase E the slag robot is removed and instead a slightly conical template 27 is introduced into the interior of the pan 10 on a carrying device 28.
  • the template 27 determines the inner surface configuration of the infeed 2, as can be seen from A.
  • Refractory feed mass 30 introduced, which has a consistency like slightly damp sand, but becomes quasi liquid under the action of the vibrators 31 working against the template 27 and fills the entire space 32 between the template 27 and the inner surface 26 homogeneously.
  • the refractory mass introduced into the intermediate space 32 is dried by means of a ladle fire 33 and combines with the old delivery to form a new compact and homogeneous delivery 2, so that the ladle 10 returns to phase A and again a ladle trip can compete.
  • a high-temperature burner 9 In tests in a 95-ton steel pan with an inner diameter of approx. 2600 mm and an inner height of approx. 3440 mm, a high-temperature burner 9 was used, which has features of DE-PS 15 29 201 and 31 in particular with regard to the nozzle design 51 479 and was arranged with the mouth of the nozzle approximately in the middle of the clear interior of the pan, as shown in C.
  • the high-temperature burner 9 was operated with approx. 280 Nm3 / h propane and 900 Nm3 / h oxygen without the addition of air. He worked for about 15 minutes until the slag had melted out sufficiently.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Medicinal Preparation (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Fertilizers (AREA)

Claims (4)

  1. Procédé de reconstitution du revêtement réfractaire d'une poche de coulée (10) destinée à la coulée de l'acier et d'autres enceintes métallurgiques semblables, dans lequel après une campagne les scories adhérentes et éventuellement aussi les couches supérieures imprégnées de scories de l'ancien revêtement sont éliminées et un nouveau revêtement complémentaire (30) réfractaire est appliqué sur l'ancien revêtement (2) en un procédé de coulée, revêtement qui fournit avec l'ancien revêtement (2) un garnissage réfractaire complet dans l'épaisseur de paroi d'origine, caractérisé en ce que dans une poche de coulée (10) encore très chaude et se présentant avec une légère inclinaison vers l'extérieur, les scories encore adhérentes à la surface intérieure sont séparées par fusion du revêtement restant à l'aide d'un brûleur (9) pour hautes températures opérant avec de l'oxygène pur en milieu réducteur et sont amenées à s'écouler à l'état liquide en fusion hors de la poche (10), et en ce que après refroidissement, la surface vitreuse du revêtement restant est rendue rugueuse, à la suite de quoi a lieu l'application du nouveau revêtement réfractaire (30).
  2. Installation pour la reconstitution du revêtement réfractaire de poches de coulée pour la coulée de l'acier et d'autres enceintes métallurgiques analogues selon le procédé de la revendication 1, caractérisé par les parties d'installation suivantes :
    a) un support (4) sur lequel peut être mise en place la poche (10), en présentant toutefois une légère inclinaison (5) vers l'extérieur,
    b) un brûleur (9) pour hautes températures, à insérer dans la poche (10), apte à être guidé sur toute la surface intérieure (26) de la poche (10) sur une lance (8) pouvant pivoter, tourner et se déplacer dans le sens de la profondeur de la poche (10),
    c) un équipement (16) pour recevoir les scories liquides de fusion s'écoulant de l'ouverture (6) de la poche,
    d) un dispositif (20) pouvant être introduit dans la poche de coulée pour créer de la rugosité sur la surface du revêtement restant (2),
    e) un gabarit (27) à introduire dans la poche droite pour la forme interne du revêtement (2) et un dispositif d'alimentation (29), au moyen duquel on peut introduire la masse de revêtement (30) dans l'espace intermédiaire (32) entre la surface intérieure (26) de l'ancien revêtement (2) et le gabarit (27).
  3. Installation selon la revendication 2, caractérisée en ce qu'un écran thermique (14) est prévu pour isoler l'intérieur de la poche de l'extérieur lorsque le brûleur (9) pour hautes températures est introduit.
  4. Installation selon la revendication 2 ou la revendication 3, caractérisée en ce que le dispositif (20) pour créer la rugosité comprend des rouleaux (23) équipés de tétons en métal dur (24) et se trouvant soumis à des vibrations, rouleaux qui peuvent être guidés, en tournant sur des bras de support (22) et en suivant fidèlement le contour, sur la surface intérieure (26) de l'ancien revêtement (2).
EP91901674A 1990-02-07 1991-01-14 Procede et installation de reconstitution du revetement refractaire de poches de coulee Expired - Lifetime EP0514383B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003646 1990-02-07
DE4003646A DE4003646C1 (fr) 1990-02-07 1990-02-07

Publications (2)

Publication Number Publication Date
EP0514383A1 EP0514383A1 (fr) 1992-11-25
EP0514383B1 true EP0514383B1 (fr) 1993-10-20

Family

ID=6399619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901674A Expired - Lifetime EP0514383B1 (fr) 1990-02-07 1991-01-14 Procede et installation de reconstitution du revetement refractaire de poches de coulee

Country Status (14)

Country Link
US (1) US5330690A (fr)
EP (1) EP0514383B1 (fr)
JP (1) JPH0798266B2 (fr)
AT (1) ATE96065T1 (fr)
AU (1) AU636704B2 (fr)
BR (1) BR9105928A (fr)
CA (1) CA2075484C (fr)
DE (2) DE4003646C1 (fr)
DK (1) DK0514383T3 (fr)
ES (1) ES2046886T3 (fr)
GR (1) GR1001444B (fr)
TR (1) TR26175A (fr)
WO (1) WO1991012103A1 (fr)
ZA (1) ZA91454B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4319393C1 (de) * 1993-06-11 1994-06-01 Chemikalien Ges Hans Lungmus M Verfahren zum Herstellen von feuerfesten Tiegeln für Stahlbehandlungspfannen
DE29503495U1 (de) * 1995-03-02 1995-04-13 Plibrico GmbH, 40210 Düsseldorf Feuerfestauskleidung für Stahlpfannen
US5624513A (en) * 1995-06-14 1997-04-29 United Technologies Corporation Removal of inserts from the interiors of turbine airfoils
US5783510A (en) * 1995-07-04 1998-07-21 Asahi Glass Company Ltd. Monolithic refractory composition wall
FR2778735A1 (fr) * 1998-05-12 1999-11-19 Basalt Refractaires France Sar Procede et dispositif pour la rehabilitation de la maconnerie interne de four a chaux

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AT274870B (de) * 1966-10-11 1969-10-10 Voest Ag Lagerkonstruktion für kippbare Tiegel oder Konverter
JPS496722A (fr) * 1972-05-08 1974-01-21
US3944193A (en) * 1972-08-26 1976-03-16 Nippon Steel Corporation Method and apparatus for forming by vibration a refractory lining of a container for a molten metal
DE2247274C3 (de) * 1972-09-27 1975-10-09 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Verfahren und Vorrichtung zum Eingießen von Stahl beim Stranggießen
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SU682320A1 (ru) * 1977-03-22 1979-08-30 Всесоюзный Научно-Исследовательский И Проектный Институт Алюминиевой Магниевой И Электродной Промышленности Установка дл удалени футеровки из металлургической емкости
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Also Published As

Publication number Publication date
GR910100048A (en) 1992-06-30
DE59100509D1 (de) 1993-11-25
JPH05503879A (ja) 1993-06-24
AU636704B2 (en) 1993-05-06
TR26175A (tr) 1995-02-15
WO1991012103A1 (fr) 1991-08-22
DE4003646C1 (fr) 1990-12-13
BR9105928A (pt) 1992-11-03
GR1001444B (el) 1993-12-30
CA2075484C (fr) 2001-03-20
EP0514383A1 (fr) 1992-11-25
CA2075484A1 (fr) 1991-08-08
AU7046291A (en) 1991-09-03
JPH0798266B2 (ja) 1995-10-25
ZA91454B (en) 1991-11-27
ATE96065T1 (de) 1993-11-15
US5330690A (en) 1994-07-19
ES2046886T3 (es) 1994-02-01
DK0514383T3 (da) 1994-03-21

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