JPH04506109A - Metallurgical container and method for producing a fire-resistant lining for the metallurgical container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Metallurgical vessel and method for producing a fire-resistant lining for the metallurgical vessel The present invention provides a process for producing a fire-resistant lining and a salt Metallurgical vessels for steel production, in particular transport ladles or Regarding processing containers.

Lining of metallurgical containers for steel manufacturing, mainly electric furnaces, ladles for transporting pig iron, or processing containers. is determined by the metallurgical process and the properties of the steel and steel scrap; Manufactured by

bonded with pitch or synthetic resins or otherwise chemically bonded or burned Lining with magnesite or dolomite bricks is common. I am a connoisseur. The above brick is made of magnesite or dolomite material (Mass!n) By replacing the bricks, costly brick manufacturing and brick transportation work can be avoided. Efforts have been made for several years. All developments related to these basic materials are towards mixing cemented magnesite or sintered dolomite with a water-activated binder. Proceeded.

After processing, these materials are then hardened to form a one-piece lining. death However, these efforts proved uneconomical.

These basic, room-temperature chemically bonded, monolithic linings provide protection throughout the wall thickness. When heated, cracks form and molten steel penetrates deeply through the cracks, damaging the inner lining. Destroys a large area of the road.

Furthermore, in the conventional coupling system, 1. Chemical bonds are activated many times over by the addition of water.

This water is not completely removed after curing and drying of the lining and, when heated, likewise A large crack forms.

In particular, in dolomite materials, water causes hydration and impairs fire resistance. be called.

Also, lining with dry, basic bulk material at the bottom of the electric furnace for horizontal lining. It is known that For such combinations, the following problem must be addressed: When a container is filled with roses and molten steel is sprayed, the roses are washed away by the molten steel. No such problem arises. When such molten steel is added to the charge, the bulk at the bottom is Covered by and protected by cold metal.

However, containers that do not have the above-mentioned metal scraps and where the steel jet hits the lining at the bottom, especially steel containers, cannot be used. In a ladle or processing vessel, the following problem arises: first, fill the vessel with bulk and pour the molten steel. If this injection is performed, a problem arises in that the loose pieces are washed away by the injection of molten steel.

It is an object of the present invention to be used at the bottom of such containers, to be easily and inexpensively manufactured, and to be easily and inexpensively manufactured. The aim is to produce linings that guarantee reliable use.

Therefore, as defined according to the invention, the working layer at least partially It is composed of bulk dry basic material. If the bulk is added, add the container first. Before heating, it is protected on the upper side by a protective layer that is chemically hardened. After loading into the container, it is constructed as a partially monolithic layer.

In this case, the main layer of the bottom lining of the vessel is designed as the working layer, which layer is made of molten steel. If you ignore the wear and tear caused by contact with the container, it will maintain its durability within the container. Furthermore, the lining Has a protective layer.

The working layer is placed in the container as dry bulk and is water-free. However, the analogy In order to facilitate forming or reduce dust generation, bulk materials may be Can be impregnated with oil, bitumen, synthetic resin, etc. The initial heating of the vessel is the For example, by the initial injection or after the production of the lining, the lining is processed in a burner. Made by a unique work process that lowers the temperature.

Sintered magnesite or dolomite is processed by temperatures somewhat higher than 1200°C. to form a solidified layer. The temperature of the molten steel is such that the layer is 40 to 60 m+. Sufficient for curing of the ceramic up to thickness. Temperature action after steel injection Formed by and ceramic bonded layers provide a one-piece load-bearing bottom The bottom lining is continuously worn on the steel furnace side during operation, but cannot be removed. On the cold side in the direction of the bottom of the pan, the bottom lining is formed continuously upwards. ladle elongation of the ceramic layer that occurs due to temperature changes when injected into the pot and discharged from the ladle. and are absorbed by loose materials that are present on the cold side and have not yet been ceramic bonded. so that severe cracking of the ceramic layer does not occur.

Ceramic-bonded thin, flexible layers exhibit slight cracking during temperature changes. At that time, if molten steel enters, the molten steel will be on the low temperature side. absorbed into the material.

The aforementioned protective layer prevents the lining from washing away when molten steel is first poured into the vessel. It has the mission of

An embodiment of the invention provides that the working layer is at least partially made of a dry basic material. The bulk is made up of integrally molten salt before the first injection into the container. The upper side is covered by a basic layer, i.e. a layer produced by heating the bulk material. It will be done. Before washing the lining, the bulk material is heated using a burner. At this time, an integrally melted layer is formed on the surface. Ru.

A thermal insulation layer is provided between the bottom of the container and the basic, refractory working layer. The insulation The layer is made of a material that is sprayed on and cures at room temperature, preferably chamotte or high-aluminum Composed by Mina.

The bottom lining of the container contains damaged parts such as perforated bricks, buffer cores or nozzles. and the damaged member is securely connected to the bottom of the container or to the insulation layer. Medicine It is often necessary to tilt the gold container. At that time, the melted (relatively thin) There is a risk that the layer will not be able to keep heavy perforated bricks etc. in place. Jiru. This risk can be prevented by injection into the insulation layer or by fixing it to the bottom of the container. will be stopped.

The buffer core incorporated in the working layer is preferably cast from a material that hardens chemically at room temperature. be done. The buffer core resists the destructive effects of the beamed steel jet. Therefore above Due to the action of the protective layer, the loose pieces (1 Sink is prevented.

It is particularly preferred for the damaged part to have a step in the area of the protective layer. This results in , particularly good bonding is obtained.

Furthermore, the damaged member can be provided with oblique side walls.

The cross section will then change as wear progresses. This allows for continuous The formed sintered layer is reliably bonded to the damaged part. to this end The best angle α to be given to the oblique side walls is determined by experiment in each individual case .

The bulk material forming the working layer is, for example, sintered magnesite, preferably containing at least 7% Sintered magnesite with lime content called CaO, sintered dolomite, or the following mixtures It is composed of compounds. The mixture is sintered dolomite containing chrome ore or corundum. It is a mixture of magnesite and sintered magnesite. In addition, iron oxide, boric acid, and boron compounds such additives are mixed into the bulk material forming the working layer as sintering aids. has been proven to be appropriate.

Furthermore, the invention relates to a method for producing a refractory lining for the bottom of metallurgical vessels for steel production. do.

The method includes the following treatments: Place a layer of dry, pourable, basic refractory material on the bottom of the container and/or insulate it. creating in layer (4) - preferably by vibration, sudden agitation or tamping; Compressing the roses, applying in pieces a protective layer consisting of a material that hardens through chemical bonds; - drying and curing the refractory material; - heating the lining; .

Heating of the lining is done by the introduction of burners or if this procedure is considered. If not, it is done by the first steel furnace itself.

One embodiment of the above method includes the following procedures: - Dry, injectable, base-resistant Producing a layer of flammable material on the bottom of the container and/or on the insulation layer (4) - preferred or compacting the bulk by vibration, rapid agitation or tamping; - heating the lining by introducing a burner;

Ceramic bonding is performed using the temperature of the steel furnace, and the bulk material is melted on the side facing the steel furnace. The present invention can be achieved by selecting a material that transmits the above temperature to the bulk material so that it hardens. Benefits can be obtained.

The inner layer of bulk material can be strengthened using sintering aids.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a sectional view of a metallurgical container according to the present invention, FIG. 2 is a sectional view of another embodiment of the present invention, and FIG. Figure 3 is a diagram of the buffer core, and Figure 4 is a cross section of the buffer core based on line IV-IV in Figure 3. FIG. 2 is a top view and a layout diagram of a buffer core in a metallurgical container.

The metallurgical vessel 1 is composed of a side wall 2a and a bottom part 2b. The bottom part 2b has an inner lining 3. The inner lining 3 is made of an outer layer 4 having heat insulation properties and a basic material having fire resistance. It is composed of a working layer 5 and a top preservation layer 6.

In the embodiment of FIG. 2, the bottom lining 3 is provided with a nozzle 11, which nozzle 11 It is placed in a perforated brick 13.

The side surface 10 of the perforated brick 13 is inclined at an angle α. Holes in the area of protective layer 6 The brick 13 is provided with a stepped portion 8. Furthermore, the perforated brick 13 is a fixed part It is fixed to the bottom part 2b by a material 7.

The buffer core 9 in FIGS. 3 and 4 has a side surface 10a inclined at an angle α and a protective layer 6. It has a step portion 8a for fixing. The edge 12 of the buffer core 9 is curved. Because For example, the buffer core 9 is attached to the side wall 2a of the container 1.

/゛ /゛ abstract The invention comprises a bottom (2b) comprising a refractory lining (3) and a basic working layer (5). ), in particular a transport ladle or a processing container. fire resistant lining In order to produce a in bulk, the bulk being oxidized prior to the initial heating of said container (1). covered on the upper side by a chemically hardened protective layer (6) and into said container (1). After pouring, configured as an integral layer or before the first heating of said container (1), overlaid by a basic layer which is integrally dissolved and produced by heating the bulk. It is considered that the sides will be covered. Furthermore, the present invention provides a fire-resistant lining for said container. Concerning the manufacturing method.

Selection diagram Figure 1 international search report

Claims (14)

[Claims] 1. a bottom part (2b) comprising a refractory lining (3) and a basic working layer (5); A metallurgical vessel for steel production, wherein the working layer (5) is at least partially , constituted as bulk dry basic material, said bulk being placed in the uppermost part of said container (1). Before the first heating, the upper side is covered with said chemically hardened protective layer (6) and the and partially constituted as an integral layer after filling said container (1). Features metallurgical vessels. 2. a bottom part (2b) comprising a refractory lining (3) and a basic working layer (5); A metallurgical vessel for steel production, wherein the working layer (5) is at least partially , constituted as bulk dry basic material, said bulk being placed in the uppermost part of said container (1). The basicity produced by integrally melting and heating said bulk before the first heating. A metallurgical vessel characterized by being covered on the upper side by a layer of. 3. a bottom (2b) of said container (1) and said working layer (6) which is fire-resistant and basic; Claim 1, characterized in that a heat insulating layer (4) is provided between the The metallurgical container according to any one of Items 1 to 2. 4. Said thermal insulation layer (4) is preferably made of a material that is sprayed on and cured at room temperature. A patent characterized in that it is preferably composed of chamotte or high alumina. A metallurgical container according to any one of claims 1 to 3. 5. The bottom lining (3) of the container (1) is provided with a perforated brick (13), which is buffered. An integrated member such as a child (9) or a nozzle (11) is provided, and the integrated member is securely connected to the bottom (2b) of the container (1) or the heat insulating layer (4). According to any one of claims 1 to 4, Metallurgical vessel. 6. The member to be assembled (9, 11, 13) has a stepped portion (8) in the region of the protective layer (6). , 8a), according to claim 5. 7. The member to be assembled (9, 11, 13) has an oblique side wall (10, 10a). As the wear progresses, the cross section changes as the wear progresses. The metallurgical container according to any one of items 5 to 6. 8. The bulk material forming said working layer (5) is, for example, sintered magnesite, preferably Sintered magnesite, sintered doloma with a high lime content of 7% or more CaO sintered with dolomite or a mixture of the following: chrome ore or corundum Claim No. 1 characterized in that it is composed of a mixture with magnesite. The metallurgical container according to any one of items 1 to 7. 9. Additives such as iron oxide, boric acid, and boron compounds act as sintering aids in the working layer. Claims 1 to 3 are characterized in that: The metallurgical container according to any one of clause 8. 10. Manufacture of the refractory lining (3) of the bottom of the metallurgical vessel (1) for steel production In law, The following actions, i.e. A layer of dry, pourable, basic, refractory material is applied to the bottom (1) of the container (1). 2b) and/or producing said thermal insulation layer (4); compacting the bulk, preferably by vibration, rapid agitation or tamping; applying in bulk said protective layer (6) of material that hardens by chemical bonding; drying and curing the refractory material and heating said lining (3); Characteristic manufacturing method. 11. of the refractory lining (3) of the bottom of the metallurgical vessel (1) for steel production; In the manufacturing method, the following measures are taken: A layer of dry, pourable, basic, refractory material is applied to the bottom (1) of the container (1). 2b) and/or producing said thermal insulation layer (4); Preferably, compacting the bulk by vibration, rapid agitation or tamping; A manufacturing method characterized by heating the lining (3) by introducing a burner. . 12. Due to the influence of the temperature of the steel furnace, ceramic bonding is performed, and the bulk material is suitable for the steel furnace. selecting a material that transfers said temperature to the bulk material so that it melts and hardens on the side; The manufacturing method according to claim 10, characterized in that: 13. The container (1) is heated by the introduction of the burner before being poured into the steel furnace. 11. The manufacturing method according to claim 10, characterized in that: 14. characterized in that the inner layer of the bulk material is reinforced by a sintering aid The manufacturing method according to any one of claims 10 to 13.