Ladle nozzle pocket block

Abstract

The utility model relates to the technical field of ferrous metallurgy equipment, in particular to a ladle nozzle pocket block. The ladle nozzle seating brick comprises a seating brick body, a seating brick upper portion, a seating brick lower portion and an isolation assembly, and the isolation assembly comprises a first isolation net and a second isolation net; a first separation net is arranged between the upper part of the seating brick and the lower part of the seating brick; the upper seat brick part comprises a first pouring part and a second pouring part wrapping the first pouring part, and a second separation net is arranged between the first pouring part and the second pouring part; and the first separation net and the second separation net are of net structures in which through holes are uniformly distributed. According to the ladle nozzle pocket block, through the design of the layered pouring structure and the isolation assembly, the production cost is effectively reduced, the service life of the ladle nozzle pocket block is prolonged, and the ladle nozzle pocket block is high in safety and suitable for batch production and has large economic benefits and social benefits.

Description

Technical Field

[0001] This utility model relates to the field of steel metallurgical equipment technology, and in particular to a ladle nozzle seat brick. Background Technology

[0002] In the continuous casting process of steelmaking, the ladle nozzle seat brick, as a key refractory component, is installed at the bottom of the ladle. Its main functions are to fix the ladle nozzle and bear the diversion sand. The appropriateness of its material selection directly affects the cost and service life of the seat brick.

[0003] Currently, most existing ladle nozzle seat bricks are produced using a monolithic casting method, employing the same grade of castable refractory. This method presents several problems in practical use: due to the significant differences in the environments in which different parts of the ladle nozzle seat brick come into contact with the material, monolithic casting easily generates thermal stress during use, leading to deformation and cracking in some areas, significantly shortening the service life of the seat brick; simultaneously, the upper part of the ladle nozzle seat brick is in direct contact with high-temperature molten steel and slag, resulting in a much higher erosion rate than the lower part. The monolithic casting method not only leads to low cost-effectiveness but also severely impacts the overall service life of the ladle, consequently affecting production efficiency and costs. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of this utility model is to provide a ladle nozzle seat brick to improve the overall performance and service life of the ladle and reduce production costs.

[0005] This utility model provides the following technical solution:

[0006] A steel ladle nozzle seat brick includes a seat brick body, comprising an upper seat brick, a lower seat brick, and an isolation component. The isolation component includes a first isolation mesh and a second isolation mesh. The first isolation mesh is disposed between the upper and lower seat bricks. The upper seat brick includes a first casting component and a second casting component that wraps around the first casting component. The second isolation mesh is disposed between the first and second casting components. The first and second isolation meshes are mesh structures with uniformly distributed through holes.

[0007] Furthermore, the isolation component is made of stainless steel.

[0008] Furthermore, the first isolation net is circular in shape, the second isolation net is cylindrical in shape, and the first isolation net is perpendicularly connected to the second isolation net.

[0009] Furthermore, the diameter of the first isolation net is the same as the diameter of the base brick body, and the height of the second isolation net is flush with or 10-30mm lower than the top of the base brick body.

[0010] Furthermore, the diameter of the through hole is less than 5mm, and the hole spacing is 5mm-100mm.

[0011] Furthermore, the lower part of the base brick is a castable layer made of slab corundum aggregate, recycled corundum and composite water-reducing agent.

[0012] Furthermore, the first casting is a casting layer prepared from large-particle corundum aggregate, metal fibers, and densifying additives.

[0013] Furthermore, the second casting element is a casting layer prepared from microporous corundum aggregate, organic fibers, and thermal shock resistant additives.

[0014] Furthermore, the thickness of the first casting is 30-50mm, and the thickness of the second casting is 20-40mm.

[0015] Furthermore, the total height of the seat brick body is 300-500mm, and the lower part of the seat brick accounts for 40-60% of the total height of the seat brick body.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention forms a multi-layered isolation structure by setting a first isolation mesh between the upper and lower parts of the seat brick and a second isolation mesh inside the upper part of the seat brick. The through-hole design of the first isolation mesh can act as a stress buffer layer, dispersing the thermal stress generated by the temperature gradient between the upper and lower parts and avoiding crack propagation caused by stress concentration. The second isolation mesh divides the upper part of the seat brick into a first casting and a second casting, allowing the use of casting materials with different properties in different areas, further reducing internal stress differences. Therefore, through the structural design of the isolation components, the thermal stress of the seat brick can be reduced, significantly reducing deformation and crack generation, and extending service life.

[0018] In addition, the installation of isolation components with through holes can not only separate the castables in different pouring areas, but also allow them to be connected to a certain extent through the through holes, thus ensuring the overall stability of the seat brick performance and improving the comprehensive performance of the seat brick.

[0019] Therefore, this utility model of steel ladle nozzle seat brick can reduce production costs, ensure product service life and overall stability, has high safety, is suitable for mass production, and has significant economic and social benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the ladle nozzle seat brick according to an embodiment of the present utility model;

[0021] Figure 2 This is a perspective view of the isolation component of the ladle nozzle seat brick in this embodiment of the present utility model;

[0022] Figure 3 This is a scene diagram of the installation of the ladle nozzle seat brick in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Lower part of the base brick; 2. First casting component; 3. Second casting component; 4. Isolation assembly; 4.1. First isolation net; 4.2. Second isolation net; 4.3. Through hole; 5. Steel shell; 6. Permanent layer of steel ladle; 7. Steel ladle brick; 8. Joint filler. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. The following embodiments are implemented based on the technical solution of this utility model, and detailed implementation methods and specific operation processes are given. However, the protection scope of this utility model is not limited to the following embodiments.

[0025] Example 1

[0026] Reference Figure 1 This utility model embodiment provides a steel ladle nozzle seat brick, including a seat brick body, including an upper seat brick, a lower seat brick 1, and an isolation component 4. The isolation component 4 includes a first isolation net and a second isolation net 4.1. The first isolation net 4.1 is provided between the upper seat brick and the lower seat brick 1. The upper seat brick includes a first casting part 2 and a second casting part 3 that wraps around the first casting part 2. The second isolation net 4.2 is provided between the first casting part 2 and the second casting part 3. The first isolation net 4.1 and the second isolation net 4.2 are mesh structures with uniformly distributed through holes 4.3.

[0027] This application incorporates a first isolation mesh 4.1 with a mesh structure between the lower and upper parts of the base brick. The through holes 4.3 of the mesh serve as a stress buffer layer, dispersing the thermal stress generated by the temperature gradient between the upper and lower parts and preventing crack propagation caused by stress concentration. By setting a second isolation mesh 4.2, the upper part of the base brick is divided into a first casting component 2 and a second casting component 3, allowing the use of casting materials with different properties in different areas (such as an upper layer of corrosion-resistant material and a lower layer of wear-resistant material), further reducing internal stress differences. Through the stress dispersion effect of the isolation component 4, the thermal stress of the base brick is reduced, and its service life is improved compared to the prior art. The through hole 4.3 design of the isolation component 4 allows the casting material to expand and contract freely during thermal expansion, avoiding structural damage caused by volume changes and reducing the risk of steel leakage.

[0028] The lower part 1 of the base brick is a castable layer made of slab corundum aggregate, recycled corundum and composite water-reducing agent; the first casting part 2 is a castable layer made of large-particle corundum aggregate, metal fiber and densification additive; the second casting part 3 is a castable layer made of microporous corundum aggregate, organic fiber and thermal shock resistant additive.

[0029] The lower part 1 of the base brick is in a relatively mild environment and can be cast using a low-cost, high-strength castable prepared with corundum aggregate, recycled corundum, and composite water-reducing agents, thus reducing costs while maintaining sufficient wear resistance. The upper part of the base brick is in direct contact with high-temperature molten steel and slag, resulting in a high erosion rate. The first casting part 2 can be cast using an anti-erosion castable prepared with large-particle corundum aggregate, metal fibers (such as alumina fibers), and densifying additives to enhance the base brick's erosion resistance. The second casting part 3 can be cast using an anti-thermal shock castable prepared with microporous corundum aggregate, organic fibers, and thermal shock resistant additives (such as ZrO2) to resist molten steel erosion and inhibit crack propagation. Furthermore, layered casting of materials can reduce the amount of high-cost materials used, thereby lowering manufacturing costs.

[0030] The diameter of the first isolation net 4.1 is the same as the diameter of the base brick body, and the height of the second isolation net 4.2 is flush with the top of the base brick body or 10-30mm lower than the top of the base brick body.

[0031] The thickness of the first casting part 2 is 30-50mm, and the thickness of the second casting part 3 is 20-40mm.

[0032] The total height of the base brick is 300-500mm, and the lower part of the base brick accounts for 40-60% of the total height of the base brick.

[0033] Reference Figure 2 In this embodiment of the invention, the isolation component 4 is made of stainless steel. The first isolation mesh 4.1 is circular in shape, and the second isolation mesh 4.2 is cylindrical in shape, with the first isolation mesh 4.1 perpendicularly connected to the second isolation mesh 4.2. The diameter of the through hole 4.3 is less than 5mm, and the hole spacing is 5mm-100mm.

[0034] The stainless steel isolation component 4 has a durability that matches the lifespan of the base brick, reducing maintenance needs caused by damage to the isolation mesh; the through holes 4.3 allow the material to expand and contract freely during thermal expansion, avoiding structural damage caused by volume changes; the small holes ensure the mechanical strength of the isolation mesh, preventing failure due to material loss or deformation at high temperatures; the reasonable hole spacing (5-100mm) ensures uniform stress distribution while maintaining structural rigidity, avoiding local overheating or penetration.

[0035] Reference Figure 3 In this embodiment of the utility model, the ladle nozzle seat brick is a key refractory component in the continuous casting process of steelmaking. In the actual steelmaking process, it is installed at the bottom of the ladle. Its outer perimeter is in close contact with the steel shell 5, the permanent layer of the ladle 6, the ladle brick 7 and the sealant 8 from bottom to top. The upper inner side is in direct contact with the molten steel. The material in contact with different areas of the ladle nozzle seat brick and the function it plays determine the material used in that area.

[0036] When molten steel is poured through the sprue seat brick, the inner area in contact with the molten steel (first casting part 2) will be subjected to high-speed scouring and erosion by the molten steel. However, by using a casting material with good scouring properties containing high-strength large-particle aggregate, metal fiber and densifying additives, the hardness, tensile strength and overall strength of this part can be improved, effectively resisting the scouring and erosion of the molten steel, preventing the sprue diameter from expanding and ensuring stable pouring.

[0037] During use, the temperature of the ladle changes drastically. The upper outer area of ​​the seat brick (second casting part 3) will be affected by the stress generated by the temperature change of the grout 8 and the ladle brick 7, as well as the stress released by itself. The second casting part 3 of this utility model can be cast using a casting material with good thermal shock resistance containing corundum aggregate with low thermal expansion coefficient, high thermal conductivity and microporous structure, organic fiber and thermal shock resistant additives. This can effectively relieve thermal stress, prevent cracking and peeling on the outer side of the seat brick, and thus ensure the integrity of the seat brick structure.

[0038] The lower part 1 of the seat brick mainly serves to support the upper water inlet and does not directly contact the molten steel. It is cast using a low-cost, high-strength castable containing plate corundum aggregate, recycled corundum and composite water-reducing agent. This can reduce costs while ensuring the high strength of the seat brick and provide stable and reliable support for the upper water inlet.

[0039] Meanwhile, the isolation component 4 separates different castable materials, ensuring that the castable materials do not mix during the casting process, while the uniformly arranged through holes 4.3 provide a certain connection between the castable materials, further ensuring the overall structural strength and stability of the seat brick.

[0040] The manufacturing steps of the ladle nozzle seat brick in this embodiment of the utility model are as follows:

[0041] Preparation: According to the design requirements, prepare raw materials such as slab corundum aggregate, recycled corundum, composite water-reducing agent, large particle corundum aggregate, metal fiber, densification additive, microporous corundum aggregate, organic fiber, and thermal shock resistant additive, as well as stainless steel isolation component 4 and seat brick mold.

[0042] Preparation of castables: Low-cost, high-strength castables for the lower part 1 of the base brick, erosion-resistant castables for the first castable part 2 of the upper part of the base brick, and thermal shock-resistant castables for the second castable part 3 are prepared according to the formulas. Sheet corundum is mixed with appropriate recycled corundum, and a composite water-reducing agent is added to prepare low-cost, high-strength castables. Large-particle corundum aggregate, metal fibers, and densifying additives are added to the erosion-resistant castable. Microporous corundum is used as aggregate in the thermal shock-resistant castable, with the addition of organic fibers and thermal shock-resistant additives.

[0043] Casting: Place the base brick mold in a suitable position and begin casting. First, pour low-cost, high-strength castable into the mold until it is flush with the water inlet of the base brick, forming the lower part 1 of the base brick. Then, accurately place the prepared isolation component 4 on the upper part of the water inlet of the base brick, ensuring that the first isolation mesh 4.1 of the isolation component 4 matches the base brick mold. Next, simultaneously pour anti-erosion castable into the inner side of the isolation component 4 to form the first anti-erosion casting part 2, and pour anti-thermal shock castable into the outer side of the isolation component 4 to form the second casting part 3. During the casting process, ensure that the castable is evenly distributed and avoid defects such as air bubbles.

[0044] Curing and Demolding: After casting, the base brick is cured according to the conventional curing process to allow the castable to fully solidify and harden. After curing, carefully demold the base brick. At this time, the isolation component 4 remains inside the base brick, resulting in a formed ladle nozzle base brick.

[0045] As can be seen from the above embodiments, the steel ladle nozzle seat brick of this utility model is made of composite materials. In practical applications, it can effectively solve problems such as cracking and fracture on the outer side of the steel ladle nozzle seat brick caused by rapid cooling and heating, erosion of the inner wall of the nozzle by molten steel during high-speed pouring, nozzle diameter expansion, unstable pouring, and profit reduction due to the continuous rise in the price of corundum raw materials. It can reduce the material consumption per ton of steel in the steelmaking process and reduce production costs, ensure the service life and safety of the product, save energy and reduce consumption, and has significant economic and social benefits in mass production.

[0046] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A ladle nozzle seat brick comprising a seat brick body, characterized by, The seat brick body comprises a seat brick upper part, a seat brick lower part and an isolation assembly, the isolation assembly comprises a first isolation net and a second isolation net; the first isolation net is arranged between the seat brick upper part and the seat brick lower part; the seat brick upper part comprises a first cast part and a second cast part wrapping the first cast part, and the second isolation net is arranged between the first cast part and the second cast part; the first isolation net and the second isolation net are in a mesh structure uniformly distributed with through holes.

2. The ladle nozzle seat brick according to claim 1, characterized in that The material of the isolation assembly is stainless steel.

3. The ladle nozzle seat brick according to claim 1, characterized in that The shape of the first isolation net is circular, the shape of the second isolation net is cylindrical, and the first isolation net is vertically connected to the second isolation net.

4. The ladle nozzle seat brick according to claim 1, characterized in that The diameter of the first isolation net is the same as the diameter of the seat brick body, and the height of the second isolation net is flush with the top of the seat brick body or 10-30 mm lower than the top of the seat brick body.

5. The ladle nozzle seat brick according to claim 1, characterized in that: The aperture of the through hole is less than 5 mm, and the hole spacing is 5-100 mm.

6. The ladle nozzle seat brick of claim 1, wherein: The seat brick lower part is a cast layer prepared from plate corundum aggregate, recycled corundum and composite water reducing agent.

7. The ladle nozzle seat brick of claim 1, wherein: The first cast part is a cast layer prepared from large-particle corundum aggregate, metal fiber and densification additive.

8. The ladle nozzle seat brick of claim 1, wherein: The second cast part is a cast layer prepared from microporous corundum aggregate, organic fiber and thermal shock resistance additive.

9. The ladle nozzle seat brick of claim 1, wherein: The thickness of the first cast part is 30-50 mm, and the thickness of the second cast part is 20-40 mm.

10. The ladle nozzle seat brick of claim 1, wherein: The total height of the seat brick body is 300-500 mm, and the seat brick lower part accounts for 40-60% of the total height of the seat brick body.

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