EP0180491A1 - Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes - Google Patents

Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes Download PDF

Info

Publication number
EP0180491A1
EP0180491A1 EP85401782A EP85401782A EP0180491A1 EP 0180491 A1 EP0180491 A1 EP 0180491A1 EP 85401782 A EP85401782 A EP 85401782A EP 85401782 A EP85401782 A EP 85401782A EP 0180491 A1 EP0180491 A1 EP 0180491A1
Authority
EP
European Patent Office
Prior art keywords
layer
gunning
approximately
refractory
thickness
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.)
Granted
Application number
EP85401782A
Other languages
English (en)
French (fr)
Other versions
EP0180491B1 (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
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 Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT85401782T priority Critical patent/ATE36407T1/de
Publication of EP0180491A1 publication Critical patent/EP0180491A1/de
Application granted granted Critical
Publication of EP0180491B1 publication Critical patent/EP0180491B1/de
Expired legal-status Critical Current

Links

Images

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 French patent application No. 8215461 in the name of the Applicant.
  • the main aggregate is conventionally a magnesian material (based on MgO and CaO) or aluminous (based on alumina A1 2 0 3 ).
  • 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 , porosity total 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 from 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 (ie 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. "Bulk density” is the ratio of the body mass at 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 sprayed product (magnesium aggregate MgO-CaO) expressed in%, and on the abscissa the content of binder (calcium phosphate) expressed in% relative to the weight of 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 f 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 increases further.
  • 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.
  • Figure 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 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 refractory lining pre -existent and the projected layer.
  • the slag may be in insufficient quantity to impregnate the layer throughout its thickness, which can lead to delamination 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.

Landscapes

  • 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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
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 true EP0180491A1 (de) 1986-05-07
EP0180491B1 EP0180491B1 (de) 1988-08-10

Family

ID=9307957

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)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025610A1 (fr) * 1994-03-23 1995-09-28 Daussan Et Compagnie Procede et dispositif pour projeter sur une paroi une boue aqueuse pour former un revetement, et revetement ainsi obtenu

Citations (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

Patent Citations (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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025610A1 (fr) * 1994-03-23 1995-09-28 Daussan Et Compagnie Procede et dispositif pour projeter sur une paroi une boue aqueuse pour former un revetement, et revetement ainsi obtenu
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.

Also Published As

Publication number Publication date
EP0180491B1 (de) 1988-08-10
ATE36407T1 (de) 1988-08-15
FR2570811A1 (fr) 1986-03-28
DE3564338D1 (en) 1988-09-15
FR2570811B1 (fr) 1988-04-08
JPS6183875A (ja) 1986-04-28

Similar Documents

Publication Publication Date Title
FR2649096A1 (fr) Procede de formation d'une masse refractaire poreuse et composition de matiere destinee a ce procede
EP0214882B1 (de) Feuerfeste Auskleidung eines metallurgischen Gefässes und Verfahren zu ihrer Herstellung
LU87602A1 (fr) Procede de formation d'une masse refractaire et lance de projection d'un melange de particules
BE1005914A4 (fr) Procede et melange destine a former une masse refractaire coherente sur une surface.
WO2005121044A2 (fr) PROCEDE DE FABRICATION DE PIECES DE FORME A BASE DE β-SIC POUR UTILISATION DANS DES MILIEUX AGRESSIFS
EP0180491B1 (de) Verfahren zum Ausbessern der feuerfesten Ausbildung eines metallurgischen Gefässes
FR2765892A1 (fr) Procede destine au revetement par diffusion en phase gazeuse de pieces en materiau resistant a la chaleur avec un materiau de revetement
FR2650271A1 (fr) Procede de soudure ceramique et melange de poudres destine a un tel procede
CA2169472C (fr) Piece de coulee comportant une couche externe apte a former une couche impermeable aux gaz et procede de mise en oeuvre
EP0495327B1 (de) Verfahren und Zusammenseztung zum in-situ Ausbessern von feuerfesten Formkörpern durch Schweissen
WO1995034395A9 (fr) Piece de coulee comportant une couche externe apte a former une couche impermeable aux gaz et procede de mise en ×uvre
CA2444550C (en) Method of recycling metallic coated scrap pieces
BE1017675A3 (fr) Melange sec pour le traitement de substrats refractaires et procede le mettant en oeuvre.
FR2707084A1 (fr) Revêtement anti-corrosion pour éléments réfractaires en silice vitreuse.
LU86174A1 (fr) Procede de formation d'une masse refractaire et lance de projection de particules refractaires et de particules oxydables exothermiquement
EP3765416A1 (de) Unterwasserbrenner
EP0367434A2 (de) Schweissen eines Cermets
EP0093039B1 (de) Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material
JP3911716B2 (ja) 炉壁の溶射補修層及び補修方法
BE891980A (fr) Procede pour deposer un revetement protecteur sur la paroi interieure d'un panier repartiteur de coulee continue
WO2004094339A1 (fr) L’utilisation d’un materiau ceramique a base de carbure de silicium dans les milieux agressifs
LU84609A1 (fr) Procede pour deposer un revetement protecteur sur la paroi interieure d'un panier repartiteur de coulee continue
RU2333181C2 (ru) Экзотермическая смесь для керамической сварки
FR2488245A1 (fr) Procede et dispositif de fusion par induction directe avec coulee en continu eventuelle d'un melange de deux ou plusieurs oxydes refractaires
BE878364A (fr) Lance tubulaire pour l'affinage et procede d'affinage de metaux fondus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE GB IT LU NL SE

17P Request for examination filed

Effective date: 19861011

17Q First examination report despatched

Effective date: 19871022

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE GB IT LU NL SE

REF Corresponds to:

Ref document number: 36407

Country of ref document: AT

Date of ref document: 19880815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3564338

Country of ref document: DE

Date of ref document: 19880915

ITF It: translation for a ep patent filed

Owner name: ING. DR. LAZZARO MARTINI S.R.L.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900930

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910823

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19910829

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19910919

Year of fee payment: 7

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19911003

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19911015

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911017

Year of fee payment: 7

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19920401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920916

Ref country code: GB

Effective date: 19920916

Ref country code: AT

Effective date: 19920916

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19920917

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19920930

BERE Be: lapsed

Owner name: INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE

Effective date: 19920930

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920916

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930602

EUG Se: european patent has lapsed

Ref document number: 85401782.9

Effective date: 19930406