Refractory prefabricated brick for steel ladle bottom impact area
By using nested structures of refractory prefabricated bricks in the impact area of the bottom of the ladle, combined with the warning effect of the mesh steel structure, the safety risks and difficulty of judgment caused by thinning of the refractory are solved, and safer and longer ladle operation is achieved .
Patent Information
- Application Number
- CN202310985206.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-07
- Publication Date
- 2025-02-14
AI Technical Summary
The entire piece of refractory prefabricated plate used in the impact area of the existing ladle bottom gradually becomes thinner during the steel erosion, resulting in an increase in safety risks and lack of obvious warning signs, making it difficult to accurately judge the thickness of the refractory, which is easy to lead to leakage accidents.
Design a refractory prefabricated brick for impact area of ladle bottom, including working layer prefabricated bricks in contact with the steel and safety layer prefabricated bricks nested on the bottom of the working layer prefabricated bricks in a T-shaped cross-section. The safety layer prefabricated bricks are at the distance. The surface is 0-30 mm plane with mesh steel structure.
The significant changes in the mesh steel structure provide warnings at high temperatures, helping the bag judges to judge the refractory condition more intuitively, avoid leakage accidents, extend the service life of the ladle, and improve the safety factor at the bottom of the bag.
Smart Images
Figure CN119426574A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a prefabricated refractory brick for a ladle, and more particularly to a prefabricated refractory brick for an impact zone at the bottom of a ladle. Background Art
[0002] There is a height difference of about 7 meters between the steel outlet of the converter and the bottom of the ladle. The impact zone at the bottom of the ladle is the part most severely eroded by molten steel. It has to withstand the impact of molten steel at a temperature of about 1650°C coming out of the converter. As the ladle is used more times, the thickness of the refractory material in the impact zone gradually decreases, and the safety risk will gradually increase.
[0003] At present, the impact zone usually uses a whole piece of refractory prefabricated plate, which will become thinner and thinner with the erosion and melting of molten steel, and even cause the impact zone to seep and leak molten steel, thus causing the entire ladle to be scrapped. To prevent such accidents from happening, after each furnace of steel casting, the ladle will be hoisted to the hot repair platform to let the ladle lie flat. The hot repair personnel will check the use of the refractory in the ladle to determine whether the refractory can continue to be used, or whether it can be taken off the line and hoisted to the cold repair platform for maintenance. Since an integral prefabricated plate is installed in the impact zone at the bottom of the ladle, the lower part of the impact zone prefabricated plate is connected to the permanent layer of the ladle. During the use of the ladle, the prefabricated plate is gradually melted and the thickness of the refractory is thinning. Since there is no obvious warning sign in the integral prefabricated plate, the ladle judge cannot accurately judge the remaining thickness of the refractory prefabricated bricks in the impact zone at the bottom of the ladle. It is completely based on experience, and sometimes it is inevitable to make mistakes in judgment, which causes the impact zone to seep and leak molten steel during the use of the ladle, and even causes the entire ladle to be scrapped.
[0004] Therefore, how to accurately and timely discover the risks brought about by the thinning of refractory materials due to scouring and melting of precast refractory bricks in the impact zone of the ladle bottom, and how to avoid seepage and leakage of molten steel in the impact zone of the ladle bottom, is a major issue in ladle steelmaking. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a precast refractory brick for the impact zone of the bottom of a ladle. The technical solution it adopts is: a precast refractory brick for the impact zone of the bottom of a ladle, which includes a working layer precast brick in contact with molten steel, and is characterized in that it also includes a safety layer precast brick with a T-shaped cross-section nested in the bottom of the working layer precast brick, wherein the safety layer precast brick is provided with a mesh steel structure on a plane 0-30 mm away from its upper surface.
[0006] A further technical feature of the present invention is: The mesh steel structure is a 100*100mm mesh steel structure welded from steel bars with a diameter of 6-10mm.
[0007] The height of the prefabricated bricks of the safety layer is 90-120 mm.
[0008] The periphery of the precast bricks of the working layer is in a staggered concave-convex design or a stepped design or a combination of the two designs from top to bottom.
[0009] When the safety layer precast bricks are provided with a mesh steel structure on a plane 0-20 mm away from their upper surface, at least 4 T-shaped rivet nails connected to the working layer precast bricks are evenly arranged on the nodes of the mesh steel structure in the upward direction, and at least 4 T-shaped rivet nails connected to the safety layer precast bricks are also evenly arranged on the nodes of the mesh steel structure in the downward direction.
[0010] The T-shaped rivet nail is welded from steel bars with a diameter of 4-6 mm, and the height of the T-shaped rivet nail is 30-70 mm.
[0011] The height of the T-shaped rivet nail is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm.
[0012] When the safety layer precast bricks are provided with a mesh steel structure on a plane 20-30 mm away from the upper surface thereof, at least 4 T-shaped rivet nails connected to the working layer precast bricks are evenly arranged on the nodes of the mesh steel structure in an upward direction.
[0013] The T-shaped rivet nail is welded from steel bars with a diameter of 4-6 mm, and the height of the T-shaped rivet nail is 30-70 mm.
[0014] The height of the T-shaped rivet nail is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm.
[0015] The beneficial effects of the present invention are: Since the refractory precast bricks for the impact zone of the ladle bottom described in the present invention include working layer precast bricks in contact with the molten steel and also include safety layer precast bricks with a T-shaped cross-section nested in the bottom of the working layer precast bricks, wherein the safety layer precast bricks are provided with a mesh steel structure on a plane 0-30 mm away from the upper surface thereof, when the refractory precast bricks for the impact zone of the ladle bottom are melted to the mesh steel structure, since the steel and refractory materials present two different brightnesses at high temperatures, it can serve as a good warning for the ladle judges, and even if the steel structure is melted, a 6-10 mm groove will be formed on the refractory surface, and the brightness of the groove at high temperature will be different from that of the surrounding refractory materials, and will be brighter than the refractory materials. In this way, the ladle judges can also judge the condition of the refractory precast bricks for the impact zone of the ladle bottom more intuitively, conveniently and quickly. When the refractory precast bricks for the impact zone of the ladle bottom are melted to the mesh steel structure, it is equivalent to drawing a warning line, which is conducive to the ladle judges to judge the condition of the refractory materials at the bottom of the ladle more intuitively, conveniently and quickly, and can ensure safer operation of the ladle. Since the prefabricated bricks of the safety layer below the grid-like steel structure are about 100mm thick, the impact zone will not immediately seep or leak molten steel. The ladle judge can promptly arrange maintenance personnel to take the ladle offline for maintenance, which can ensure the ladle's safer operation and effectively extend its service life.
[0016] In addition, due to thermal shock problems, longitudinal cracks are very likely to occur in the working layer precast bricks of the refractory precast bricks used in the impact zone of the ladle bottom. When the cracks extend to the safety layer precast bricks, since the safety layer precast bricks and the working layer precast bricks are cast twice and there are joints at the interface, the cracks are blocked by the joints at the interface between the working layer precast bricks and the safety layer precast bricks and will not continue to extend downward, thus preventing the molten steel from directly penetrating into the permanent layer of the ladle bottom and improving the safety factor of the ladle bottom. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a structural cross-sectional view according to a specific embodiment of the present invention; Figure 2 yes Figure 1 Structural stereogram of the middle mesh steel structure and T-shaped rivets; Figure 3 is a structural cross-sectional view according to another specific embodiment of the present invention; Figure 4 yes Figure 3 Structural stereogram of the central mesh steel structure and T-shaped rivets. DETAILED DESCRIPTION
[0018] The present invention will be further described in detail below with reference to the accompanying drawings.
[0019] Example 1, reference Figure 1 to Figure 2A refractory precast brick for the impact zone of the bottom of a ladle, comprising a working layer precast brick 1 in contact with molten steel, and a safety layer precast brick 2 with a T-shaped cross-section nested in the bottom of the working layer precast brick, wherein the safety layer precast brick is provided with a mesh steel structure 3 on a plane 20-30 mm away from its upper surface; the safety layer precast brick 2 has a height of 90-120 mm.
[0020] In this embodiment, the mesh steel structure 3 is a 100*100mm mesh steel structure welded from steel bars with a diameter of 6-10mm; in order to strengthen the connection stability between the precast bricks of the safety layer and the precast bricks of the working layer, 4 T-shaped rivet nails 4 connected to the precast bricks of the working layer are evenly arranged on the nodes of the mesh steel structure, and the T-shaped rivet nails 4 are welded from steel bars with a diameter of 4-6mm, and the height of the T-shaped rivet nails is 50 mm; the steel bars used in the mesh steel structure have a thicker diameter, and the safety warning is more obvious, and the steel bars used for the T-shaped rivet nails have a thinner diameter, and the thermal expansion is small, which will not affect the refractory material.
[0021] In addition, in this embodiment, the periphery of the working layer precast bricks 1 is designed in a step-like shape from top to bottom, so that when used, they can be engaged with the working layer castable in the non-impact area and are not easy to fall off.
[0022] In practical applications, the number of T-shaped rivets evenly arranged on the nodes of the mesh steel structure and connected to the precast bricks of the working layer can also be 5, 6, 7, 8 or even more; the height of the T-shaped rivets is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm.
[0023] Embodiment 2, in this embodiment, the safety layer precast brick 2 is provided with a mesh steel structure 3 on a plane 0-20 mm away from its upper surface. The mesh steel structure is a 100*100mm mesh steel structure welded by steel bars with a diameter of 6-10mm; in order to strengthen the connection stability between the safety layer precast bricks and the working layer precast bricks, the nodes of the mesh steel structure 3 are also evenly provided with 4 T-shaped rivet nails 4 connected to the working layer precast bricks in the upward direction, and the nodes of the mesh steel structure 3 are also evenly provided with 4 T-shaped rivet nails 4 connected to the safety layer precast bricks in the downward direction. In addition, in this embodiment, the periphery of the working layer precast brick 1 is designed with concave and convex staggered from top to bottom, so that it can bite with the working layer castable in the non-impact area during application and is not easy to fall off. The other structures are the same as those in Embodiment 1.
[0024] In practical applications, the number of T-shaped rivets uniformly arranged in the upward and downward directions on the nodes of the mesh steel structure can also be 5, 6, 7, 8 or even more; the height of the T-shaped rivets is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm; the periphery of the working layer precast bricks 1 from top to bottom can also be a combination of a stepped design and a concave-convex staggered design.
[0025] The refractory prefabricated bricks for the impact zone of the ladle bottom of the present invention include a working layer prefabricated brick 1 in contact with the molten steel, and a safety layer prefabricated brick 2 with a T-shaped cross section nested at the bottom of the working layer prefabricated bricks, wherein the safety layer prefabricated bricks are 0-30 meters away from the upper surface thereof. A mesh steel structure 3 is arranged on the mm plane. When the prefabricated refractory bricks in the impact zone of the ladle bottom are melted to the mesh steel structure 3, because the steel and refractory materials show two different brightnesses at high temperature, it can serve as a good warning for the ladle judges. Even if the steel structure is melted, a 6-10mm groove will be formed on the surface of the refractory material. The brightness of the groove will be different from that of the surrounding refractory materials at high temperature, and it will be brighter than the refractory materials. In this way, the ladle judges can judge the status of the prefabricated refractory bricks in the impact zone of the ladle bottom more intuitively, conveniently and quickly. When the prefabricated refractory bricks in the impact zone of the ladle bottom are melted to the mesh steel structure 3, it is equivalent to drawing a cordon, which is conducive to the ladle judges to judge the status of the refractory materials at the bottom of the ladle more intuitively, conveniently and quickly, and can ensure safer operation of the ladle. Since the prefabricated bricks of the safety layer below the grid-like steel structure 3 are still about 100 mm thick, the impact zone will not immediately seep or leak molten steel. The ladle judge can promptly arrange maintenance personnel to take the ladle offline for maintenance, which can ensure safer operation of the ladle and effectively extend the service life of the ladle.
[0026] In addition, due to thermal shock problems, longitudinal cracks are very likely to occur in the working layer precast bricks 1 of the refractory precast bricks used in the impact zone of the ladle bottom. When the cracks extend to the safety layer precast bricks 2, since the safety layer precast bricks 2 and the working layer precast bricks 1 are cast and formed twice, there are joints at the interface. The cracks are blocked by the joints at the interface between the working layer precast bricks 1 and the safety layer precast bricks 2 and will not continue to extend downward, thereby preventing the molten steel from directly penetrating into the permanent layer of the ladle bottom and improving the safety factor of the ladle bottom.
[0027] The technical content and technical features of the present invention have been disclosed above, but it is understood that under the creative ideas of the present invention, those skilled in the art can make various changes and improvements to the above structure, including the combination of technical features disclosed or claimed separately here, and other combinations that obviously include these features. These variations and / or combinations all fall within the technical field involved in the present invention and fall within the protection scope of the claims of the present invention.
Claims
1. A prefabricated refractory brick for the impact zone of the ladle bottom, comprising a prefabricated brick for the working layer in contact with the molten steel, characterized in that It also includes a safety layer precast brick with a T-shaped cross-section nested at the bottom of the working layer precast brick, wherein the safety layer precast brick is provided with a mesh steel structure on a plane 0-30 mm away from its upper surface.
2. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 1, characterized in that: The height of the prefabricated bricks of the safety layer is 90-120 mm.
3. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 1, characterized in that: The mesh steel structure is a 100*100mm mesh steel structure welded from steel bars with a diameter of 6-10mm.
4. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 1, characterized in that: The periphery of the precast bricks of the working layer is in a staggered concave-convex design or a stepped design or a combination of the two designs from top to bottom.
5. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 1 or claim 2 or claim 3 or claim 4, characterized in that: When the safety layer precast bricks are provided with a mesh steel structure on a plane 0-20 mm away from their upper surface, at least 4 T-shaped rivet nails connected to the working layer precast bricks are evenly arranged on the nodes of the mesh steel structure in the upward direction, and at least 4 T-shaped rivet nails connected to the safety layer precast bricks are also evenly arranged on the nodes of the mesh steel structure in the downward direction.
6. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 5, characterized in that: The T-shaped rivet nail is welded from steel bars with a diameter of 4-6 mm, and the height of the T-shaped rivet nail is 30-70 mm.
7. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 6, characterized in that: The height of the T-shaped rivet nail is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm.
8. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 1 or claim 2 or claim 3 or claim 4, characterized in that: When the safety layer precast bricks are provided with a mesh steel structure on a plane 20-30 mm away from the upper surface thereof, at least 4 T-shaped rivet nails connected to the working layer precast bricks are evenly arranged on the nodes of the mesh steel structure in an upward direction.
9. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 8, characterized in that: The T-shaped rivet nail is welded from steel bars with a diameter of 4-6 mm, and the height of the T-shaped rivet nail is 30-70 mm.
10. The prefabricated refractory brick for the impact zone of the ladle bottom according to claim 9, characterized in that: The height of the T-shaped rivet nail is 30 mm, 40 mm, 50 mm, 60 mm or 70 mm.