EP0716894A1 - Procédé pour appliquer sur les faces intérieures d'un récipient métallurgique un revêtement de protection comportant au moins deux couches - Google Patents

Procédé pour appliquer sur les faces intérieures d'un récipient métallurgique un revêtement de protection comportant au moins deux couches Download PDF

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Publication number
EP0716894A1
EP0716894A1 EP95402750A EP95402750A EP0716894A1 EP 0716894 A1 EP0716894 A1 EP 0716894A1 EP 95402750 A EP95402750 A EP 95402750A EP 95402750 A EP95402750 A EP 95402750A EP 0716894 A1 EP0716894 A1 EP 0716894A1
Authority
EP
European Patent Office
Prior art keywords
layer
container
binder
mold
liquid metal
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.)
Withdrawn
Application number
EP95402750A
Other languages
German (de)
English (en)
French (fr)
Inventor
André Daussan
Jean-Charles Daussan
GéRARD DAUSSAN
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.)
Daussan SAS
Original Assignee
Daussan SAS
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 Daussan SAS filed Critical Daussan SAS
Publication of EP0716894A1 publication Critical patent/EP0716894A1/fr
Withdrawn legal-status Critical Current

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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; Breaking away linings
    • F27D1/1626—Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners

Definitions

  • the present invention relates to a method for applying to the interior faces of a metallurgical container for transferring liquid metal a consumable protective coating comprising at least two layers.
  • the invention also relates to the coating obtained according to this process and the composition of this coating.
  • the first layer is formed in the space between the mold and the interior wall of the container, while the second layer is sprayed.
  • the disadvantage of such a process lies in the fact that the second layer is sprayed in the form of aqueous mud.
  • This layer is therefore wet; it should therefore be dried thoroughly before pouring the liquid metal into the container to avoid any risk of explosion resulting from the formation of hydrogen from the decomposition of water due to the high temperature.
  • this layer cannot contain a water-sensitive compound, such as quicklime which has a purifying function with respect to the oxides contained in the liquid metal. .
  • the object of the present invention is to remedy these drawbacks.
  • the first layer is wet, while the second layer intended to come into contact with the liquid metal is practically dry, so that it can contain compounds sensitive to water, having purifying properties, such as quicklime.
  • said powdery material is applied to the first hardened layer in the region of the bottom of the container to form a second base layer and the lateral parts of the second layer after introduction of the preheated or heated mold into the container.
  • thermosetting binder and a flux are used to form the second layer of quicklime.
  • Quicklime can thus exert purifying properties with respect to the oxides contained in the liquid metal.
  • thermosetting binder contained in this layer makes it possible to ensure, after hardening, under the effect of the heat exerted by the preheated or heating mold, the cohesion of the layer.
  • the first layer contains magnesia as the main constituent.
  • the particle size and the composition of the inorganic particles of the first layer are chosen so that said layer does not sinter or sinter only slightly at the temperature prevailing during the transfer of the liquid metal into the container.
  • the coating can be detached very easily from the wall of the container, which considerably facilitates cleaning thereof.
  • the second layer is mixed with 5% to 60% by weight of elements capable of generating an exothermic reaction.
  • This exothermic reaction melts the quicklime and burns the carbon contained in the second layer.
  • a continuous casting distributor 1 comprising an outer metal jacket 2 and an inner coating 3 of cement or refractory bricks.
  • a pouring orifice provided with a pouring nozzle 4.
  • the mold 7 is metallic and is heated internally using gas burners 10.
  • the first hardened layer 5 in the area of the bottom of the container is applied, said pulverulent material to form a second bottom layer 6a and produces the lateral parts of the second layer 6 after introduction of the preheated or heated mold 7 into the tundish 1.
  • the second layer 6 of quicklime, a thermosetting binder and a flux is formed.
  • This quicklime has a purifying function with respect to the oxides present in the liquid metal poured into the distributor 1.
  • the binder makes it possible after hardening to ensure the initial cohesion of the layer 6, the flux facilitates sintering under the effect of heat and makes it possible to maintain the cohesion of the layer 6 for the entire duration of the stay of the liquid metal at the inside the distributor 1.
  • the first layer 5 contains magnesia as the main constituent.
  • the proportion of magnesia is for example equal to 75% by weight.
  • the particle size and the composition of the inorganic particles of the first layer 5 are chosen so that said layer does not sinter or weakly sinter at the temperature prevailing during the transfer of the liquid metal into the distributor 1.
  • this layer 5 in contact with the permanent coating 2 does not adhere to the latter, so that at the end of casting, the coating is easily detached from the wall of the distributor, which facilitates its cleaning.
  • the mold 7 is preheated or the heating mold is used to obtain a temperature between 400 and 800 ° C.
  • the position and / or dimensions of the mold in the container are adjusted to adjust the thickness of the second layer 6.
  • the layer 6 intended to come into contact with the liquid metal is mixed with and which comprises quicklime, between 5 and 6% by weight of element which can generate an exothermic reaction.
  • elements can consist of magnesium and / or calcium supplemented with calcium nitrate and / or barium and / or aluminum as well as for example calcium fluoride and / or magnesium and / or barium.
  • FIGS. 4 and 5 This variant of the method according to the invention is illustrated by FIGS. 4 and 5.
  • composition for making the coating coming into contact with the liquid metal to protect the interior of a liquid metal transfer container comprises the following compounds in the weight proportions indicated below:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP95402750A 1994-12-19 1995-12-06 Procédé pour appliquer sur les faces intérieures d'un récipient métallurgique un revêtement de protection comportant au moins deux couches Withdrawn EP0716894A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415230 1994-12-19
FR9415230A FR2728185A1 (fr) 1994-12-19 1994-12-19 Procede pour appliquer sur les faces interieures d'un recipient metallurgique un revetement de protection comportant au moins deux couches

Publications (1)

Publication Number Publication Date
EP0716894A1 true EP0716894A1 (fr) 1996-06-19

Family

ID=9469909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402750A Withdrawn EP0716894A1 (fr) 1994-12-19 1995-12-06 Procédé pour appliquer sur les faces intérieures d'un récipient métallurgique un revêtement de protection comportant au moins deux couches

Country Status (3)

Country Link
EP (1) EP0716894A1 (enrdf_load_stackoverflow)
CA (1) CA2165143A1 (enrdf_load_stackoverflow)
FR (1) FR2728185A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101858694A (zh) * 2010-06-22 2010-10-13 武汉科技大学 一种用于感应炉预制炉衬的成型模具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1313447A (fr) * 1962-01-25 1962-12-28 Foseco Trading Ag Perfectionnement à la fabrication de produits réfractaires
GB1454201A (en) * 1974-05-09 1976-11-03 Miki M Method of lining a ladle
FR2316025A1 (fr) * 1975-07-02 1977-01-28 Vayda Alexandre Procede de formation d'un garnissage refractaire pour enceintes recevant un metal en fusion
FR2509453A1 (fr) * 1981-07-07 1983-01-14 Nippon Kokan Kk Appareil pour durcir et chauffer un garnissage refractaire
EP0105795A2 (fr) * 1982-09-29 1984-04-18 Jacques Gilson Procédé et installation de moulage d'un revêtement réfractaire de conteneur pour métal liquide
FR2646367A1 (fr) 1989-04-26 1990-11-02 Daussan & Co Procede et installation pour realiser un revetement sur les parois interieures d'un recipient metallurgique
FR2657549A1 (fr) 1990-01-26 1991-08-02 Daussan & Co Procede pour appliquer sur les faces interieures d'un recipient metallurgique un revetement de protection comportant au moins deux couches et revetement de protection ainsi obtenu.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1313447A (fr) * 1962-01-25 1962-12-28 Foseco Trading Ag Perfectionnement à la fabrication de produits réfractaires
GB1454201A (en) * 1974-05-09 1976-11-03 Miki M Method of lining a ladle
FR2316025A1 (fr) * 1975-07-02 1977-01-28 Vayda Alexandre Procede de formation d'un garnissage refractaire pour enceintes recevant un metal en fusion
FR2509453A1 (fr) * 1981-07-07 1983-01-14 Nippon Kokan Kk Appareil pour durcir et chauffer un garnissage refractaire
EP0105795A2 (fr) * 1982-09-29 1984-04-18 Jacques Gilson Procédé et installation de moulage d'un revêtement réfractaire de conteneur pour métal liquide
FR2646367A1 (fr) 1989-04-26 1990-11-02 Daussan & Co Procede et installation pour realiser un revetement sur les parois interieures d'un recipient metallurgique
FR2657549A1 (fr) 1990-01-26 1991-08-02 Daussan & Co Procede pour appliquer sur les faces interieures d'un recipient metallurgique un revetement de protection comportant au moins deux couches et revetement de protection ainsi obtenu.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101858694A (zh) * 2010-06-22 2010-10-13 武汉科技大学 一种用于感应炉预制炉衬的成型模具

Also Published As

Publication number Publication date
FR2728185B1 (enrdf_load_stackoverflow) 1997-02-28
FR2728185A1 (fr) 1996-06-21
CA2165143A1 (en) 1996-06-20

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