EP0180491B1 - Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes - Google Patents

Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes Download PDF

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Publication number
EP0180491B1
EP0180491B1 EP85401782A EP85401782A EP0180491B1 EP 0180491 B1 EP0180491 B1 EP 0180491B1 EP 85401782 A EP85401782 A EP 85401782A EP 85401782 A EP85401782 A EP 85401782A EP 0180491 B1 EP0180491 B1 EP 0180491B1
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EP
European Patent Office
Prior art keywords
layer
process according
gunite
lining
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
Application number
EP85401782A
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English (en)
French (fr)
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EP0180491A1 (de
Inventor
Claude Guenard
Robert Adam
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
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Priority to AT85401782T priority Critical patent/ATE36407T1/de
Publication of EP0180491A1 publication Critical patent/EP0180491A1/de
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Classifications

    • 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 or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • 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
    • F27D19/00—Arrangements of controlling devices

Definitions

  • the invention relates to the repair of the refractory lining of a metallurgical container (in particular a steelworks converter or a transfer and / or treatment pocket) by spraying through a flame a gunning material.
  • a metallurgical container in particular a steelworks converter or a transfer and / or treatment pocket
  • the material projecting through a flame must contain at least two types of constituents, a first - the main aggregate, of the same nature as that of the material making up the coating to be repaired - which remains solid through the flame and which constitutes the reinforcement of the sprayed product, and a second - the binder: voluntary addition or impurities present in the product - which serves as cement for the main aggregate.
  • the material is delivered in powder form to a burner, which is advantageously a "multidard" burner as described in the French patent document FR-A-2 533 020 in the name of the Applicant.
  • the main aggregate is conventionally a magnesian (based on MgO and CaO) or aluminous (based on alumina AI 2 0 3 ) material.
  • the binder in the first case, is generally based on phosphates or sodium or calcium silicates, whereas in the case of an aluminous aggregate, a binder based on calcium aluminates is usually used. It is also known that a binder consisting of oxygen converter slag (LD, OLP, etc.) can be suitable for both a magnesium aggregate and an aluminous aggregate.
  • the object of the invention is to find a remedy for the poor behavior of the layers projected in the conventional manner.
  • This object is achieved according to the invention by the fact that one puts in place, by projection of a refractory material of gunning through a flame, two superimposed layers of the same material, the first layer having, on the one hand , a total porosity of 15 to 25% in order to promote its adhesion to the coating by impregnation with the slag present on the surface of this coating, and on the other hand, a thickness sufficient to be able to be impregnated with all of this slag, the second layer having an apparent density of at least 3.1 kg / dm 3 in order to promote the resistance of the sprayed material to chemical and mechanical attack by the molten bath which the metallurgical container will contain.
  • the inventors have in fact discovered that the quality of the sprayed layer depends closely on its density (and therefore vice versa, on its porosity). They were able to show that when the sprayed layer is very dense, there is no reaction between the sprayed product and the slag layer remaining on the coating to be repaired. It follows that during the metallurgical operation (refining or bag treatment) following the projection, the intermediate layer of slag melts and causes the detachment of the projected layer.
  • the sprayed layer is porous, there is reaction and interdiffusion between the slag and the sprayed layer, which ensures the latter a good adhesion by impregnation by the slag.
  • the porosity of the layer makes it vulnerable to chemical corrosion and mechanical erosion.
  • an excellent behavior of the sprayed product is obtained by first spraying a porous layer, intended to ensure adhesion by impregnation with the slag, then over, a dense layer, intended to ensure the high resistance to corrosion. and subsequent erosion by the molten metal bath.
  • total porosity designates the ratio of the volume of the pores (open and closed) to the total apparent volume (i.e. matter + pores). This ratio is usually multiplied by 100 in order to be able to express the total porosity in percentages. For flame gunning products, the porosity is almost exclusively open. "Apparent density” is the ratio of the mass of the body to its apparent volume. For the same material, apparent density and porosity are linked by the following relationship: the apparent density is equal to the product of the absolute density by the difference 1-porosity.
  • Porosity is a geometric characteristic independent of the nature of the material, unlike density. Strictly speaking, it is therefore necessary to compare the porosities and not the densities of various products. However, in the remainder of this thesis, taking into account the fact that the products studied have close absolute densities, we will use either concept.
  • FIG. 1 a graph showing on the ordinate the porosity of the projected product (magnesium aggregate MgO-CaO) expressed in%, and on the abscissa the content of binder (calcium phosphate) expressed in% by in relation to the weight of the aggregate.
  • the experiment was carried out with a specific gunning power constant at 2.5 kW / kg.
  • the graph shows that there is a direct relationship of inverse proportionality between the binder content and the porosity.
  • the graph in FIG. 2 was obtained for a product based on MgO, CaO containing 7.5% of binder consisting of calcium phosphate.
  • the apparent density increases linearly to a maximum of 3.30 (or about 7% of porosity) for a power of 6 kW / kg, then stabilizes at this value when the specific power still increases.
  • This value of 3.30 in fact represents the maximum possible value that the density which is measured when cold can reach; the difference between this value and the theoretical density (3.55) of the product seems to correspond to the shrinkage due to the volume contraction of the product during its cooling.
  • FIG. 3 gives the results obtained on products containing 2.5 - 7.5 - 12 - 15 and 20% of binder.
  • a second conclusion is that it is possible to carry out the deposition, in accordance with the invention, by varying the specific power of the burner and in particular by varying the powder flow rate.
  • the recommended thickness of approximately 5 mm for the first layer is in the middle of the range of determined values going from 3 to 8 mm.
  • the layer may be insufficiently thick to incorporate, by diffusion, all of the slag, so that detachments are to be feared following a melting of the residual slag at the interface between the pre refractory lining -existent and the projected layer.
  • the slag may be in insufficient quantity to impregnate the layer throughout its thickness, which can lead to detachments due to the poor mechanical resistance of the surface portion not impregnated with the sprayed layer. .
  • the thicknesses recommended for this second layer are dictated in a nonlimiting manner only by production requirements. Below 1 cm in thickness, repetitive repairs may become too frequent compared to the usual practice which is about one repair every 8 h. Beyond 2 cm, taking into account the powder flow limits, the repair time may exceed the 10 to 15 minutes generally available in the production cycle at the steelworks.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Claims (9)

1. Verfahren zum Ausbessern der feuerfesten Auskleidung eines metallurgischen Gefäßes durch Spritzen eines feuerfesten Guntierungs bzw. Tokretierungsmaterials durch eine Flamme, dadurch gekennzeichnet, daß zwei Schichten des gleichen Materials übereinander in Stellung gebracht werden, wobei die erste Schicht einerseits eine Gesamtporosität von 15 - 25 % aufweist, um ihre Haftfähigkeit an der Auskleidung durch Imprägnieren mit der Schlacke zu fördern, die an der Oberfläche der genannten Auskleidung vorhanden ist, und anderseits eine solche Dicke besitzt, daß die gesamte Schlacke die genannte erste Schicht imprägniert und die zweite Schicht ein Raumgewicht von wenigstens 3,1 kg/dm3 aufweist, um die Festigkeit des gespritzten Materials gegen die chemischen und mechanischen Angriffe des Schmelzbades zu erhöhen, das späterhin in dem Behälter gebildet wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Dicke der genannten ersten Schicht zwischen 3 und 8 mm liegt.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die genannte Dicke 5 mm beträgt.
4. Verfahren nach Anspruch 1 zum Ausbessern der feuerfesten Auskleidung einer metallurgischen Transport- oder Verarbeitungspfanne, dadurch gekennzeichnet, daß das Raumgewicht der zweiten Schicht 3,2 kg/dm3 nicht überschreitet.
5. Verfahren nach Anspruch 1 zum Ausbessern der feuerfesten Auskleidung eines Stahlkonverters, dadurch gekennzeichnet, daß das Raumgewicht (die Schüttdichte) der zweiten Schicht wenigstens 3,2 kg/dm3 beträgt.
6. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Dicke der zweiten Schicht zwischen 1 und 2 cm beträgt.
7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die beiden genannten überereinandergelagerten Schichten mittels einer Gunitierungs-bzw. Torkretierungskanone in Stellung gebracht werden, die aus einem Bündel von aneinanderliegenden Rohren besteht, von denen jedes an seinem Ausgangsende eine gleiche Fraktion der Gesamtmenge an Gunitierungsmaterial in Form von Pulver zugeführt erhält.
8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Dichte der einander überlagernden Schichten variiert wird, indem die spezifische Leistung der Gunitierung moduliert wird.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die spezifische Gunitierungsleistung moduliert wird, indem die Menge an Gunitierungsmaterial variiert wird.
EP85401782A 1984-09-21 1985-09-16 Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes Expired EP0180491B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401782T ATE36407T1 (de) 1984-09-21 1985-09-16 Verfahren zum ausbessern der feuerfesten ausbildung eines metallurgischen gefaesses.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8414552A FR2570811B1 (fr) 1984-09-21 1984-09-21 Procede de gunitage a travers une flamme avec mise en place de deux couches de produits a densites differentes
FR8414552 1984-09-21

Publications (2)

Publication Number Publication Date
EP0180491A1 EP0180491A1 (de) 1986-05-07
EP0180491B1 true EP0180491B1 (de) 1988-08-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401782A Expired EP0180491B1 (de) 1984-09-21 1985-09-16 Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes

Country Status (5)

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EP (1) EP0180491B1 (de)
JP (1) JPS6183875A (de)
AT (1) ATE36407T1 (de)
DE (1) DE3564338D1 (de)
FR (1) FR2570811B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2717720A1 (fr) * 1994-03-23 1995-09-29 Daussan & Co Revêtement pour protéger l'intérieur d'un récipient métallurgique, dispositif et procédé d'application de ce revêtement.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015515A (en) * 1962-12-28 1966-01-05 Quigley Co Improvements in or relating to multiple coatings of refractory compositions for hot furnace repair
FR1437713A (fr) * 1965-03-31 1966-05-06 Union Carbide Corp Procédé de revêtement de fours
BE891980A (fr) * 1982-02-01 1982-05-27 Centre Rech Metallurgique Procede pour deposer un revetement protecteur sur la paroi interieure d'un panier repartiteur de coulee continue

Also Published As

Publication number Publication date
ATE36407T1 (de) 1988-08-15
EP0180491A1 (de) 1986-05-07
FR2570811A1 (fr) 1986-03-28
FR2570811B1 (fr) 1988-04-08
JPS6183875A (ja) 1986-04-28
DE3564338D1 (en) 1988-09-15

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