EP0422192B1 - Verfahren und zusammensetzung zum auskleiden eines metallurgischen gefässes mittels einer reinigenden auskleidung und auf diese weise hergestellte auskleidung - Google Patents

Verfahren und zusammensetzung zum auskleiden eines metallurgischen gefässes mittels einer reinigenden auskleidung und auf diese weise hergestellte auskleidung Download PDF

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Publication number
EP0422192B1
EP0422192B1 EP90907138A EP90907138A EP0422192B1 EP 0422192 B1 EP0422192 B1 EP 0422192B1 EP 90907138 A EP90907138 A EP 90907138A EP 90907138 A EP90907138 A EP 90907138A EP 0422192 B1 EP0422192 B1 EP 0422192B1
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EP
European Patent Office
Prior art keywords
composition
use according
alkaline
lining
coating
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
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EP90907138A
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English (en)
French (fr)
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EP0422192A1 (de
Inventor
Jean-Charles Daussan
Gérard Daussan
André Daussan
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Daussan SAS
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Daussan SAS
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Priority to AT90907138T priority Critical patent/ATE99199T1/de
Publication of EP0422192A1 publication Critical patent/EP0422192A1/de
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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

Definitions

  • the present invention relates to a process for coating a metallurgical container, such as a tundish or ladle, with a purifying coating.
  • the present invention also relates to a use, for the implementation of the above process, of a composition known per se.
  • purifying coating is meant a coating capable of reducing pollution of the liquid metal by impurities such as oxides.
  • means are currently used such as pouring tubes interposed between the ladle and the tundish and covering powders disposed on the surface of the molten metal.
  • DE-C-966 136 discloses a method for producing a basic insulating-refractory brick having a porosity greater than 45%, by compression and baking of a raw mass containing a natural carbonate.
  • a base mass comprising a large proportion of fine-grained constituents, such as chromite, magnesia, zirconia, etc., is mixed with a coarser particle size carbonate containing approximately 50% by weight of CO2, then , if necessary after forming, the base mass is cooked, until a sintering or a ceramic bond is obtained.
  • Such a brick is adapted to be placed between the metal frame of a furnace and the basic refractory lining of this furnace. It is not suitable for being brought into contact with molten metal.
  • JP-A- 86-33743 also discloses a refractory material in the form of plates comprising two layers, an interior purifying layer of limestone material containing at least 10% by weight of CaO or CO3 Ca or the mixture of two, and an outer layer in contact with the permanent coating and containing at least 80% MgO.
  • coatings for metallurgical vessels in particular pouring distributors, obtained by spraying a composition in the form of aqueous mud containing refractory particles, such as SiO2, Al2O3, MgO or a mixture thereof, and an organic or inorganic binder. These particles sinter under the effect of the heat of the liquid metal poured into the container, which ensures the cohesion of the coating.
  • refractory particles such as SiO2, Al2O3, MgO or a mixture thereof
  • organic or inorganic binder such as silicad silicates
  • Coatings obtained by applying raw dolomite or calcium carbonate are also known.
  • Such coatings have purifying properties with respect to liquid metal. These properties are mainly based on the greed of CaO for oxides which pollute the metal such as Al2O3, FeO, Fe2O3, giving compounds which are more fusible than the constituents and which migrate towards the slag.
  • aqueous mixture comprising approximately 98% of raw dolomite and 2% of sodium silicate as a binder.
  • the coating was fully baked to around 900 ° C, in order to release the CO2 from the dolomite.
  • the coating thus cooked had a porous structure whose mechanical strength was insufficient to resist the abrasion caused by the liquid metal.
  • the Applicant has continued its research in order to discover an industrially acceptable solution making it possible to produce a purifying coating from raw dolomite or calcite.
  • the object of the present invention is precisely to propose a process for producing such a purifying coating, and a use of a known composition for the implementation of this process.
  • the invention thus relates to a method for coating the interior wall of a metallurgical container for transferring liquid metal with a purifying coating based on at least one oxide of an alkaline earth metal.
  • a composition comprising at least one simple or multiple carbonate of alkaline earth metal added of a predetermined proportion of refractory grain, this composition being capable of setting and sintering in contact with the liquid metal.
  • the composition may also contain a certain proportion of either alkaline earth hydroxides or alkaline earth oxides capable of hydrating during wetting of the composition and of activating lime or magnesia sufficiently "in situ" during preheating said composition, again with the aim of imparting sufficient resistance to the coating.
  • the process according to the invention thus makes it possible to obtain an economical purifying coating since it uses as starting material one or more alkaline earth carbonates such as dolomite or calcite.
  • the coating obtained has good resistance to erosion caused by the metal poured into the metallurgical vessel.
  • the coating according to the invention has a double function, namely the purifying function and the function of wear coating, so that it can advantageously replace all the wear and protective coatings applied so far which do not have no purifying function.
  • the merit of the present invention lies in the fact that it has surprisingly discovered that the addition of a certain proportion of refractory material to one or more simple or multiple alkaline earth carbonates made it possible to obtain, after baking, that is to say after the elimination of CO2, a structure having an erosion resistance markedly greater than that obtained in the absence of this refractory material.
  • the coating obtained in addition to its purifying properties due to the alkaline earth oxide which is obtained after baking, has a structure which is sufficiently porous to give it thermal insulation properties making it possible to limit the cooling of the liquid metal contained in the pouring container.
  • the coating obtained according to the process according to the invention does not adhere strongly to the permanent refractory coating to which it is applied so that at the end of casting, it can be easily removed in order to apply a new coating .
  • composition can advantageously be sprayed in the form of aqueous mud, with approximately 15 to 20% by weight of water.
  • the composition can also be poured between the interior surface of the metallurgical container and a wall forming a mold.
  • the coating is heated to the core around 900 ° C, to release the CO2 of the alkaline earth carbonate and optionally the water of constitution and / or hydration.
  • This heating can be carried out by any means such as a burner, electric heating elements by Joule effect or with emission of infrared radiation.
  • the single or multiple alkaline earth carbonate used in the composition is preferably a carbonate chosen from the following compounds: raw dolomite, raw calcite and their mixtures, dolomite being however preferred because of its low cost in the raw state (not calcined).
  • the composition used preferably contains a binder chosen from mineral binders such as, for example: alkali metal silicate or phosphate, organic such as, for example, phenolic resin, hydraulic, such as, for example, cements, and mixtures thereof.
  • mineral binders such as, for example: alkali metal silicate or phosphate
  • organic such as, for example, phenolic resin
  • hydraulic such as, for example, cements, and mixtures thereof.
  • the refractory material added to the alkaline earth carbonate is preferably chosen from the following compounds: - calcined dolomite, lime, magnesia, chromium magnesia, chromium oxide, zirconium silicate, silica, silico-aluminous and / or mixtures thereof.
  • the presence of the binder is not compulsory, because a setting effect with water already exists in its absence.
  • the alkaline earth carbonate can be pure carbonate of calcium or associated with another carbonate, for example magnesium carbonate, in the form of dolomite.
  • alkaline earth oxides cited as examples of refractory material may be replaced in whole or in part by hydroxides and / or sulfates, the latter being transformed into oxides during cooking.
  • the grains of the refractory material have at least in part a dimension greater than that of the grains of carbonates and / or hydroxides and / or alkaline earth sulfates.
  • the particle size can be adjusted as a function of the desired result, namely the porosity which gives insulating and / or sintering properties which ensures cohesion and resistance to erosion.
  • composition according to the invention also preferably contains up to 20% by weight of organic and / or mineral fibers.
  • composition according to the invention may also contain a carbonaceous matter in grains.
  • the composition additionally contains up to 5% by weight of a surfactant.
  • the aforementioned composition can be applied to the bottom and the lateral faces of a tundish, by spraying or molding in one or more layers a few centimeters thick.
  • a flux which migrates towards the surface with water during drying such as boric acid, for example, to obtain a rapid sintering of the surface which comes into contact with liquid steel, and seek a slower or less active sintering in the mass of the purifying coating thanks to a flux which does not migrate such as, for example, colemanite.
  • composition and the grain size of the grains can vary from one layer to another depending on the desired properties.
  • the inner layer (the one intended to come into contact with the liquid metal) to have a high resistance to erosion, it will contain more refractory material, and will contain fine particles to promote sintering.
  • the outer layer adjacent to the permanent refractory lining may be sinter less than the inner layer, so that it can be easily detached from the permanent lining at the end of casting.
  • the basicity of the inner layer may be favored by a high calcium content in order to obtain optimal purifying properties.
  • first purifying inner layer a second layer which is little or very little sinterable or not sinterable, and a third outer sinterable layer or at least partially sinterable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Paints Or Removers (AREA)

Claims (22)

  1. Verfahren zum Auskleiden der Innenwand eines metallurgischen Umfüllbehälters für flüssiges Metall mittels einer reinigenden Auskleidung auf der Basis eines Oxids eines Erdalkalimetalls, gekennzeichnet durch die folgenden Stufen:
    - auf die Innenwand des Behälters wird eine Zusammensetzung aufgebracht, die wenigstens ein einfaches oder mehrfaches Carbonat des Erdalkalimetalls einschließt, dem ein vorbestimmter Anteil eines feuerfesten Materials in Form von Körnern hinzugefügt ist, wobei diese Zusammensetzung haften kann, und
    - zum Eliminieren des CO₂ und gegebenenfalls des chemisch gebundenen Wassers und/oder des Hydratwassers und zur Erzielung einer Schicht mit poröser Struktur aus dem oder den Erdalkalimetalloxid(en) und dem kornförmigen feuerfesten Material wird die Auskleidung erhitzt, wobei der Anteil des feuerfesten Materials so vorbestimmt ist, daß der Auskleidung eine vorbestimmte Widerstandsfähigkeit gegen die Erosion durch das in den Behälter gegossene flüssige Metall infolge des Sinterns der Auskleidung beim Kontakt mit dem flüssigen Metall verliehen wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusammensetzung in Form eines wäßrigen Schlamms aufgespritzt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusammensetzung zwischen die Innenfläche des Behälters und eine eine Form bildende Wand eingegossen wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Auskleidung im Inneren auf etwa 900°C erhitzt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß vor der reinigenden Auskleidung wenigstens eine erste Schicht aus einem feuerfesten Material auf der Basis feuerfester stabiler Oxide aufgebracht wird, wobei dieses Material bei den beteiligten Temperaturen zumindest teilweise gesintert werden kann.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß vor der reinigenden Auskleidung zwei Schichten aus feuerfesten Materialien auf der Basis stabiler feuerfester Oxide aufgebracht werden, wobei das Material der einen Schicht wenig oder sehr wenig sinterfähig ist, während das Material der anderen Schicht zumindest teilweise bei den beteiligten Temperaturen sinterfähig ist.
  7. Anwendung einer Zusammensetzung zur Herstellung einer reinigenden Verkleidung mittels der Durchführung des Verfahrens nach einem der Ansprüche 1 bis 6, mit wenigstens einem einfachen oder mehrfachen Carbonat eines Erdalkalimetalls, zu dem ein vorbestimmter Anteil eines feuerfesten Materials in Körnerform hinzugefügt ist, wobei diese Zusammensetzung haftfähig ist und im Kontakt mit flüssigem Metall sinterbar ist.
  8. Anwendung nach Anspruch 7, dadurch gekennzeichnet, daß das Erdalkalicarbonat aus folgenden Verbindungen ausgewählt ist: ungebrannter Dolomit, Kalkspat und ihre Mischungen.
  9. Anwendung nach einem der Ansprüche 7 oder 8, dadurch gekennzeichnet, daß die angewendete Zusammensetzung unter anderem ein Bindemittel einschließt, das aus den mineralischen, organischen, wassergebundenen Bindemitteln und ihren Mischungen ausgewählt ist.
  10. Anwendung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß das feuerfeste Material aus den folgenden Verbindungen ausgewählt ist:
    - calcinierter Dolomit, Kalk, Magnesiumoxid, Chrom-Magnesiumoxid, Chromoxid, Circonsilicat, Siliciumdioxid, Tonerdesilicat und ihren Mischungen.
  11. Anwendung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß die Zusammensetzung in Gewichtsanteilen folgendes enthält:
    Erdalkalicarbonat:   30 bis 95 %
    feuerfestes Material:   70 bis 5 %
    Bindemittel:   0 bis 15 %.
  12. Anwendung nach Anspruch 11, dadurch gekennzeichnet, daß die Zusammensetzung in Gewichtsanteilen folgendes enthält:
       60 bis 80 % ungebrannten Dolomit
       10 bis 40 % feuerfestes Material und
       1 bis 5 % Bindemittel.
  13. Anwendung nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, daß die Körner des feuerfesten Materials wenigstens zum Teil eine Abmessung haben, die größer als die Körner des Erdalkalicarbonats ist.
  14. Anwendung nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, daß die Zusammensetzung außerdem bis zu 20 Gew.-% organische und/oder mineralische Fasern enthält.
  15. Anwendung nach einem der Ansprüche 7 bis 14, dadurch gekennzeichnet, daß die Zusammensetzung unter anderem bis zu 5 Gew.-% eines grenzflächenaktiven Mittels enthält.
  16. Anwendung nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, daß die Zusammensetzung unter anderem einen gewissen Anteil an Erdalkalihydroxid(en) und/oder Erdalkalioxid(en) enthält, die sich beim Anfeuchten der Zusammensetzung mit Wasser verbinden können, und/oder Erdalkalisulfate enthält.
  17. Anwendung nach einem der Ansprüche 7 bis 16, dadurch gekennzeichnet, daß die Zusammensetzung unter anderem von 0 bis 10 Gew.-% eines Flußmittels enthält.
  18. Anwendung nach Anspruch 17, dadurch gekennzeichnet, daß das Flußmittel aus Olivin, Colemanit, Calciumborat, Eisenoxid, Fluoriden, Borsäure und ihren Salzen (Borax) sowie Mischungen daraus ausgewählt ist.
  19. Anwendung nach einem der Ansprüche 17 oder 18, dadurch gekennzeichnet, daß die Zusammensetzung ein leicht lösbares Flußmittel enthält.
  20. Anwendung nach einem der Ansprüche 7 bis 19, dadurch gekennzeichnet, daß die Zusammensetzung in Gewichtsanteilen folgendes enthält:
       Dolomit und/oder Calcid und/oder Hydroxide und/oder Erdalkalisulfate:   30 bis 95 %
       feuerfeste Körner:   70 bis 5 %
       Bindemittel:   0 bis 15 %
       Kohlenstoff:   0 bis 5 %
       Flußmittel:   0 bis 10 %.
  21. Anwendung nach einem der Ansprüche 7 bis 20, dadurch gekennzeichnet, daß die Hauptbestandteile folgende Korngrößen haben:
    - Carbonate, Hydroxide, Oxide und Sulfate von Erdalkalimetallen: Durchmesser unter 3 mm und vorzugsweise unter 1 mm;
    - feuerfeste Körner: Durchmesser unter 5 mm und vorzugsweise unter 2 mm.
  22. Anwendung nach einem der Ansprüche 7 bis 21, dadurch gekennzeichnet, daß die jeweiligen Korngrößen der verschiedenen Bestandteile so gewählt sind, daß sich eine reinigende Auskleidung mit maximaler Kompaktheit ergibt.
EP90907138A 1989-04-12 1990-04-11 Verfahren und zusammensetzung zum auskleiden eines metallurgischen gefässes mittels einer reinigenden auskleidung und auf diese weise hergestellte auskleidung Expired - Lifetime EP0422192B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90907138T ATE99199T1 (de) 1989-04-12 1990-04-11 Verfahren und zusammensetzung zum auskleiden eines metallurgischen gefaesses mittels einer reinigenden auskleidung und auf diese weise hergestellte auskleidung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904822 1989-04-12
FR8904822A FR2648066B1 (fr) 1989-04-12 1989-04-12 Procede pour revetir un recipient metallurgique par un revetement epurant et composition s'y rapportant

Publications (2)

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EP0422192A1 EP0422192A1 (de) 1991-04-17
EP0422192B1 true EP0422192B1 (de) 1993-12-29

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US (1) US5188794A (de)
EP (1) EP0422192B1 (de)
KR (1) KR960005886B1 (de)
AU (1) AU628557B2 (de)
BR (1) BR9006411A (de)
CA (1) CA2030522A1 (de)
CS (1) CS179790A3 (de)
DE (1) DE69005578T2 (de)
ES (1) ES2047930T3 (de)
FR (1) FR2648066B1 (de)
HU (1) HUT60173A (de)
WO (1) WO1990011853A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2683220B1 (fr) * 1991-11-04 1994-05-20 Sollac Procede de revetement d'un repartiteur de coulee continue par un materiau refractaire, repartiteur et materiau refractaire resultant de la mise en óoeuvre de ce procede.
US5314599A (en) * 1992-07-28 1994-05-24 Alcan International Limited Barrier layer against fluoride diffusion in linings of aluminum reduction cells
US5507474A (en) * 1994-01-13 1996-04-16 Minerals Technologies, Inc. Lining for molten metal handling vessles
US5643350A (en) * 1994-11-08 1997-07-01 Vectra Technologies, Inc. Waste vitrification melter
AUPS329202A0 (en) * 2002-07-01 2002-07-18 Cast Centre Pty Ltd Coatings for articles used with molten metal
US7591976B2 (en) * 2004-03-15 2009-09-22 Krosakiharima Corporation Nozzle for use in continuous casting
CN115448701B (zh) * 2022-08-19 2023-04-14 山西太钢不锈钢股份有限公司 一种aod冶炼镍基合金用镁钙耐火材料及其制备方法

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE1239266B (de) * 1962-04-28 1967-04-27 Basf Ag Verfahren zum Faerben und bzw. oder Bedrucken von Textilgut

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
GB527024A (en) * 1939-03-28 1940-10-01 Pierre Imbert Improvements in or relating to basic refractory materials
DE966136C (de) * 1951-05-28 1957-07-11 Veitscher Magnesitwerke Ag Verfahren zur Herstellung hochfeuerfester, basischer Isoliersteine
DE1218923B (de) * 1959-04-23 1966-06-08 Rheinische Kalksteinwerke Verfahren zur Herstellung hochporoeser, feuerfester, basischer Leichtsteine
DE1239226B (de) * 1961-01-05 1967-04-20 Dolomitwerke Gmbh Verfahren zur Herstellung von poroesen Formkoerpern aus Dolomit und/oder Magnesit
US4400335A (en) * 1981-12-15 1983-08-23 Hoganas Ab Process for repairing refractory linings
JPS6133743A (ja) * 1984-07-25 1986-02-17 Kobe Steel Ltd 板状耐火物の構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1239266B (de) * 1962-04-28 1967-04-27 Basf Ag Verfahren zum Faerben und bzw. oder Bedrucken von Textilgut

Also Published As

Publication number Publication date
FR2648066B1 (fr) 1994-04-01
EP0422192A1 (de) 1991-04-17
HU904442D0 (en) 1992-08-28
CS179790A3 (en) 1992-09-16
AU5551790A (en) 1990-11-05
ES2047930T3 (es) 1994-03-01
HUT60173A (en) 1992-08-28
AU628557B2 (en) 1992-09-17
BR9006411A (pt) 1991-08-06
DE69005578T2 (de) 1994-04-28
DE69005578D1 (de) 1994-02-10
US5188794A (en) 1993-02-23
CA2030522A1 (en) 1990-10-13
KR960005886B1 (ko) 1996-05-03
KR920700081A (ko) 1992-02-19
WO1990011853A1 (fr) 1990-10-18
FR2648066A1 (fr) 1990-12-14

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