JPH0335868A - Refractory abrasion member for sliding stop- per in metallurgical vessel - Google Patents

Abstract

PURPOSE: To prevent the deterioration of slidability of a sliding plate by evaporation of a lubricant, such as tar, with which the sliding plate of a sliding closure device for discharging molten steel disposed at a vessel for molten steel is impregnated at the time of tapping of molten steel by providing the surface of the sliding plate with a hermetic layer consisting of a specific heat resistant and airtight material. CONSTITUTION: The respective wear members of the sliding closure device which is used for a molten steel discharging device disposed at the large-capacity vessel for the molten steel or the like and comprises the wear members, such as an inflow sleeve 2, bottom plate 9, closure plate 11 and outflow sleeve 13, have outflow passages A1 to A4 for the molten steel, are impregnated with tar or the like as the lubricant and are provided with the hermetic layers consisting of granular Al2 O3 , SiO2 , MgO and materials having excellent refractoriness, such as carbon, hexagonal BN, graphite and clay, in order to prevent the evaporation of the tar at the high temp. of the molten steel. The evaporation of the tar or the like at the high temp. of the molten steel at the time of using the sliding closure device is prevented and the instability of the tapping work of the molten steel by the deterioration in the slidability of the closure plate 1 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides that wear parts are impregnated with an impregnating agent, preferably tar, or have surfaces exposed to the risk of wear during elevated operating temperatures. has a reservoir for supplying impregnating agent,
Refractory wear parts, such as plates and sleeves, for sliding closures in metallurgical vessels.

[Conventional technology]

In sliding closing devices for containers of large springs containing molten metal, especially molten steel, wear of the wear parts often causes difficulties after a relatively short operating time, so that these wear parts must be replaced frequently. Must be. In principle, the hot water penetrates into the pores of the surfaces of the worn parts subjected to the action and also reaches, for example, between the bottom plate and the sliding plate which are pressed together, thereby significantly hastening the destruction of the copper oxide material. .

To prevent this, it is known to impregnate refractory wear parts with tar, and as a result of this impregnation, the open pores become clogged with hydrocarbons, which are simultaneously transported between the sliding plate and the working surface of the bottom plate. It also serves as a lubricant. In this case, however, considerable amounts of tar evaporate and condense in the slide plate housing on the keys, cooling passages and other mechanical parts and pollute the air in the working area of the operator of the slide closure.

From German Patent Application No. 28 30 199 a perforated closure plate for a sliding closure device is known, in which an inner ring is arranged in the flow opening of the closure plate, and the connection between this ring and the closure plate is In between, there remains an annular space closed off by an insulating mortar layer, in which at least one tar ring is arranged. Each tar ring is covered on the lower and side surfaces by a metal plate skin which must allow the flow of tar vapor only through the mortar layer, which opens onto the working surface of the closing plate. . The tar vapor thereby reaches in an annular flow between the working surfaces of the closing plate pair, where it decomposes without clogging of the open pores of the wear element to prevent metal W3 lagoon from penetrating. do.

German Patent No. 3,406,941 discloses a wear element in question, which is encapsulated with an impregnating agent as a reservoir for hydrocarbons that reach the endangered wear element during operation. the exposed surface of the wear element across the pore network of the refractory material, having at least one closed space, in this case with a closure device for the charging of an impregnating agent passing through the pores; A reservoir is provided which is open to the. In this way, a permanent replenishment of the impregnating agent, especially in the direction of the exposed surfaces, must be achieved in the event of a temperature increase during operation. Evaporation of considerable amounts of tar to the outside cannot be avoided in this case either.

[Problem to be solved by the invention]

It is an object of the present invention to improve a wear element of the type mentioned at the outset such that the slag penetration is sufficiently reduced, the closure and sliding properties are improved or Impregnant vapor, especially tar vapor, to improve temperature change resistance.
The objective is to ensure that disadvantageous leakage of

[Means to solve the problem]

This problem is solved according to the invention in that the wear element has a heat-resistant gas-tight sealing layer outside the surface exposed to the risk of wear. In this way, wear parts with impregnating agents are prevented from emitting impregnating agent vapors, for example tar vapors, into the environment over their free surfaces which are not endangered by metal deposition. The tapping operation is cleaner with respect to the emissions generated, and fouling of the sliding closure device is largely avoided.

According to a preferred embodiment of the invention, the sealing layer is formed on the basis of a curable synthetic resin or natural resin, for example an epoxy resin. Such a layer has the necessary temperature resistance and reliably performs the desired sealing function.

In an extension of the inventive idea, the sealing layer is AA203+S
It is advantageous if it contains finely divided refractory material, such as j029MgO or carbon particles, with a particle size of approximately 20 pm or less.

Furthermore, the dense layer can contain flaky refractory materials such as hexagonal boron nitride, graphite or clay, especially kaolin, to achieve the desired purpose.

A relatively cost-saving solution is obtained if the sealing layer is formed on the basis of a sealing wax, optionally encapsulating heat-resistant inorganic colored pigments, ie is a commercially available material.

The sealing layer can also be formed, for example, based on a heat-resistant ink, which closes the pores on the surface of the closure plate and thus provides a sufficient seal to prevent the escape of impregnant vapors, e.g. tar vapors. Do this.

Furthermore, it is also possible to apply two or more layers, for example a layer of refractory components and a sealing layer, to the side of the wear element that is not subjected to the action of storing hot water. In this case, layer combinations with different properties are conceivable, for example a well-adhering subbing layer with a well-sealing surface layer.

〔Example〕

The invention will be explained below with reference to several embodiments shown diagrammatically in the drawings.

Figures 1 to 4 all show the flow direction 1 from top to bottom.
2 shows a refractory wear member as may be present in a sliding closure device having a flow path A for molten metal.

According to FIG. 1, an inlet sleeve 2 impregnated with tar is placed in a perforated brick 3 with the intervention of a mortar joint 4, and this perforated brick of the sleeve 2 extends downwardly from 3. The protruding part has a heat-resistant gas-tight sealing layer 6 on the conical surface 5, which sealing layer closes the free area of the sleeve surface, which in other parts is free from perforated bricks. 3 and covered by the key 8 of the bottom plate 9 at @7, the three layers 6 insulate from the outside the tar vapors that form in the open pores of the sleeve when the temperature rises during operation, and these The pores are the only route for the outflow from the area of the surface affected by the molten metal at the inner end face and the flow opening AI. There, the tar vapor acts to reduce wear and does not disappear as harmful emissions.

Also in the tar-impregnated base plate 9 according to FIG.
A similar arrangement M is taken, in which case the free surface area facing the outside air is made gas-tight by the sealing layer 6, so that the resulting tar vapor is discharged into the closure device opening A for the appropriate use described above.
2 and the sliding surface 10.

Unlike the base plate 9, the tar-impregnated sliding plate 11 according to FIG.
a, these sealing layers have different properties and can take special operating conditions and requirements into account.

Instead of the wear element according to FIGS. 1 to 3, the outflow sleeve 13 according to FIG. 4 is not impregnated with tar;
It has an annular tar reservoir 14 from which the open sleeve pores are supplied with tar.

In this case, the sealing layer 6 applied to the conical surface and outer end face of the sleeve 13 prevents volatile tar substances from flowing through the flow opening A.
Forces outflow only in 4.

Of course, wear elements impregnated with tar and having a tar reservoir can also be used in this connection.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the inlet sleeve, FIG. 2 is a longitudinal sectional view of the bottom plate, FIG. 3 is a longitudinal sectional view of the closure plate, and FIG. 4 is a longitudinal sectional view of the outflow sleeve.

Claims (1)

[Claims] 1. A metallurgical vessel in which the wear part is impregnated with an impregnating agent or has a reservoir for supplying the impregnating agent to surfaces exposed to the risk of wear during elevated operating temperatures. In fire-resistant wear parts, such as plates and sleeves, for certain sliding closures, the wear parts (2, 9, 11 and 13) are at least externally exposed to the atmosphere exposed to the surface exposed to wear. A fire-resistant wear element for a sliding closure in a metallurgical vessel, characterized in that it has a heat-resistant gas-tight sealing layer (6) in the surface area. 2. Claim 1, characterized in that the sealing layer (6) is formed using a curable synthetic resin or natural resin as a base material.
Wear parts described in . 3 The sealing layer (6) is made of Al_2O_3, SiO_2, M
Wear element according to claim 1 or 2, characterized in that it comprises particulate refractory material, such as gO or carbon particles. 4. Wear element according to one of claims 1 to 3, characterized in that the sealing layer (6) comprises a flaky refractory material, such as hexagonal boron nitride, graphite or clay. 5. Wear element according to claim 3, characterized in that the particulate material has a particle size of approximately 20 μm or less. 6. Wear element according to claim 1, characterized in that the sealing layer (6) is formed using a sealing wax as a base material. 7. The wear member according to claim 1, characterized in that the sealing layer (6) is formed using a heat-resistant ink as a base material. 8. Wear element according to one of claims 1 to 7, characterized in that at least two layers (6 and 6a) of different properties are arranged one above the other.