JPH05296667A - Construction structure of container for molten metal - Google Patents

Abstract

PURPOSE:To prevent sintering between an inner lining refractory material and a rear lining refractory material, deterioration of quality of the refractory materials and to enable realization of extension of replacing period of the rear refractory materials to be attained by a method wherein a carbon layer is present between the inner lining refractory materials and the rear lining refractory materials in the container of molten metal. CONSTITUTION:In the case that a container for molten metal, e.g. a laddle 1 is processed, rear bricks 4 acting as rear lining refractory materials are applied as rear lining refractory materials through refractory mortar 3 inside an iron surface 2 of a laddle 1, and then a carbon sheet 6 is adhered to an inner surface of the rear bricks 4 through refractory mortar 5. Then, the inner lining refractory materials 8 are applied to the inner surface of the carbon sheet 1 through refractory mortar 7. The carbon sheet 6 is made such that carbon powder is pressed to form a sheet-like product and when the carbon sheet 6 is applied, a proper number of gas removing holes of about 1 to 5mm are arranged in the carbon sheet 6 in order to facilitate evaporation of moisture content when the refractory of the laddle 1 is dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a refractory lining for a molten metal container such as a ladle for containing and transporting molten metal, a tundish, a towing car, a converter for melting and refining molten metal, and an electric furnace. The present invention relates to a building structure for preventing seizure with a lining refractory and deterioration of quality of the lining refractory.

[0002]

2. Description of the Related Art A molten metal container is a refractory lining that comes into contact with the molten metal and is gradually eroded, and a refractory lining provided on the back of the refractory lining to prevent molten metal from leaking out of the container. The refractory lining and the refractory lining are joined by, for example, refractory mortar. The lining refractory is eroded by molten metal or slag floating on the upper surface of the molten metal, and the entire lining refractory is replaced when the residual thickness becomes thin.However, for the lining refractory, the lining refractory is locally melted, for example. , When fire resistance and corrosion resistance deteriorate due to erosion by molten metal, slag, etc.,
That is, it is ideal that the refilling is not normally performed except when the function of preventing the leakage of the molten metal to the outside of the container is deteriorated.

[0003]

However, conventionally, the heat of the contained molten metal causes seizure between the lining refractory material and the lining refractory material at the boundary surface thereof, so that only the lining refractory material is disassembled when the lining refractory material is disassembled. It becomes impossible to dismantle the lining refractory, or slag, etc., penetrates into the lining refractory through the pores and joints of the lining refractory, and the above-mentioned function of the lining refractory is deteriorated. Often it was necessary to replace the refractory material. If the refractory lining is used until the residual thickness becomes extremely thin in order to reduce the refractory cost, seizure between the refractory lining and the refractory backing and deterioration of the quality of the refractory backing become more severe. Furthermore, if the refractory lining is made up of irregularly shaped refractory in order to save labor in the construction work, the refractory lining and refractory lining are more resistant than if both refractory lining and refractory lining are bricks. The seizure with the object became severe, and it was impossible to dismantle only the amorphous refractory. Therefore, the refractory lining (brick) needs to be replaced, and the labor-saving effect of the refractory construction work cannot be sufficiently obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent seizure between a refractory lining and a refractory lining of a molten metal container and deterioration of the quality of the refractory, thereby extending the refilling cycle of the refractory lining.

[0005]

In order to solve the above-mentioned problems, the present invention is characterized in that a carbon layer is interposed between an inner refractory material and a backing refractory material of a molten metal container. A metal container construction structure is provided.

[0006]

[Function] Since the carbon layer that does not deteriorate the refractory is interposed between the lining refractory and the lining refractory, the lining refractory and the lining refractory generated by the heat of the molten metal when the molten metal is contained It is possible to prevent the seizure of the refractory and prevent the deterioration of the quality of the refractory lining by protecting the refractory lining from the molten metal, slag, and the like that enter through the pores and joints in the refractory lining.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIG. 1 shows a sectional view of a ladle as an example of a molten metal container in which a carbon layer is interposed between a refractory lining and a refractory lining. In FIG. 1, a lining brick 4 as a lining refractory is installed inside the iron skin 2 of the ladle 1 through a refractory mortar 3. The backing brick 4 may be, for example, an acidic refractory material such as low stone, chamotte, clay, zircon, and silica, a neutral refractory such as alumina and spinel, or a magnesia, magchrome, etc. Basic refractory is used. The refractory mortar 3 is preferably made of the same material as the backing brick 4. The backing brick 4 may be a stack of two or more layers by combining two or more of the refractory materials. A carbon sheet 6 as a carbon layer, which is a feature of the present invention, is adhered to the inner surface of the backing brick 4 with a refractory mortar 5. It is preferable that the refractory mortar 5 used for attaching the carbon sheet 6 be made of the same material as the backing brick 4 as much as possible. The carbon sheet 6 is formed by pressing carbon powder into a sheet, and has a working temperature of -200 in a non-oxidizing atmosphere, for example.
Carbofit, nica film, grasile, permafoil, grafoyl (above, trademark) etc. having a physical property value of thermal expansion coefficient of 100 × 10 ⁻⁶ / ° C. at ˜3000 ° C. and a thickness of 0.1 to 1.0 mm Can be used. When constructing the carbon sheet 6, it is preferable to provide an appropriate number of gas vent holes having a diameter of 1 to 5 mm in the carbon sheet 6 in order to facilitate evaporation of water when the refractory material in the ladle is dried. This gas vent hole should be provided especially when an irregular refractory material is used as the lining refractory material 8. A refractory lining 8 is applied to the inner surface of the carbon sheet 6 via a refractory mortar 7. As the lining refractory 8, an acid, neutral or basic refractory is used as in the backing refractory. In this case, the refractory mortar 7 is preferably made of the same material as the refractory used for the refractory lining 8. When using an irregular refractory as the lining refractory 8, the refractory mortar 7 is not used, and the irregular refractory is directly applied to the carbon sheet 6.

FIG. 2 shows another embodiment of the present invention. By applying liquid graphite to the backing brick 4, a graphite layer is provided between the inner refractory material 8 and the backing brick (lining refractory material) 4. 1
The longitudinal sectional view of the side wall portion of the ladle 1 with 0 interposed is shown. The graphite layer 10 is formed by adding and mixing graphite powder to a solution of water, sodium silicate, bittern, liquid range, etc. to form a liquid, and applying this to the surface of the backing brick 4 by brushing or spraying. To do. The graphite layer 10 is preferably applied not only to the side wall portion of the ladle 1 but also to the entire surface of the backing brick 4 including the bottom portion (not shown) of the ladle 1.

The ladle 1 constructed as described above is preheated to dry the refractory lining 8 and the backing brick 4 and to raise the temperature, and then the molten metal is received.

[0011]

As described above, according to the present invention, the carbon layer is interposed between the lining refractory and the lining refractory of the molten metal container, so that the lining refractory and the lining refractory are separated from each other. It is possible to prevent seizure and quality deterioration of the refractory lining. As a result, the relining cycle of the refractory lining is 10 from the conventional 500 charges (number of times molten metal is stored).
It has been extended to 00 charges, and the cost of refractory lining has been greatly reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a molten metal container of the present invention.

FIG. 2 is a longitudinal sectional view (partially enlarged view) showing another embodiment of the molten metal container of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ladle (molten metal container) 2 ... Iron skin 3 ... Refractory mortar 4 ... Brick lining (refractory lining) 5 ... Refractory mortar 6 ... Carbon sheet (carbon layer) 7 ... Refractory mortar 8 ... Refractory lining 10 ... Graphite layer (carbon layer)

Claims (1)

[Claims] 1. A structure for constructing a molten metal container, characterized in that a carbon layer is interposed between an inner refractory material and a backing refractory material of the molten metal container.