A ladle bottom lining structure having a gradient thickness structure

Abstract

This utility model relates to the field of refractory materials technology for metallurgical equipment, and in particular to a ladle tank bottom lining structure with a gradient thickness, including ladle nozzle seat bricks, vertically laid tank bottom bricks, and lining wall bricks. The vertically laid tank bottom bricks include center bricks, intermediate bricks, and edge bricks, which are laid in a ring from the ladle nozzle seat bricks towards the edge of the ladle tank bottom, with the thickness d of the center bricks, intermediate bricks, and edge bricks increasing by 30mm to 40mm respectively. The lining wall bricks are set at the bottom of the inner wall of the ladle tank and connect with the edge bricks, with the thickness e of the lining wall bricks decreasing by 15mm to 20mm from bottom to top. The beneficial effects of this utility model are: by optimizing the thickness distribution, it improves thermal shock resistance, structural stability, and service life, and increases the steel loading capacity.

Description

Technical Field

[0001] This utility model relates to the field of refractory materials for metallurgical equipment, and in particular to a steel ladle bottom lining structure with a gradient thickness. Background Technology

[0002] In modern steelmaking processes, the ladle, as a crucial vessel for receiving and transferring molten steel at high temperatures, endures extremely high heat loads, chemical corrosion, and mechanical impacts at its bottom. Traditional ladle bottom bricks often employ a uniform thickness design, which, while simple to install, has revealed several problems during long-term use:

[0003] 1. The central area is prone to longitudinal cracks due to thermal stress concentration;

[0004] 2. Insufficient wear resistance in the edge area makes it prone to edge chipping, leading to extensive replacement of the tank bottom bricks;

[0005] 3. Low material utilization rate and large overall weight affect lifting efficiency;

[0006] 4. Replacement is difficult after partial damage, and maintenance costs are high.

[0007] Therefore, there is an urgent need for a new type of tank bottom brick structure that can meet the structural strength requirements, rationally allocate materials, alleviate thermal stress, and increase the capacity of molten steel.

[0008] Chinese utility model patent CN217727128U, entitled "A Ladle Bottom Masonry Structure for Improving Steel Yield," discloses a ladle bottom masonry structure, including a nozzle seat brick, a buffer joint located around the nozzle seat brick, and a flow stabilizer plate positioned close to the side of the nozzle seat brick between the nozzle seat brick and the buffer joint. The raised flow stabilizer plate creates resistance to the molten steel, effectively delaying the formation of eddies. Without affecting the quality of the molten steel, it can reduce the amount of molten steel remaining in the ladle by 1-3 tons, thus improving the steel yield. However, this ladle bottom structure is designed to improve the steel yield and lacks any technical features to prevent thermal stress concentration from damaging the ladle bottom structure. Utility Model Content

[0009] To overcome the shortcomings of existing technologies, this utility model provides a steel ladle bottom lining structure with a gradient thickness structure. Without significantly increasing manufacturing difficulty, it improves thermal shock resistance, structural stability and service life by optimizing the thickness distribution, thereby increasing the steel loading capacity.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A steel ladle tank bottom masonry structure with a gradient thickness includes steel ladle nozzle seat bricks, vertically laid tank bottom bricks, and cladding bricks. The vertically laid tank bottom bricks include center bricks, intermediate bricks, and edge bricks. Center bricks, intermediate bricks, and edge bricks are laid in a ring around the steel ladle nozzle seat bricks towards the edge of the tank bottom. The center bricks are laid 300mm to 600mm outward from the steel ladle nozzle seat bricks. The intermediate bricks are laid 300mm to 700mm outward from the center bricks. The edge bricks are laid to the perimeter of the tank bottom. The thickness d of the center bricks, intermediate bricks, and edge bricks increases by 30mm to 40mm. The cladding bricks are located at the bottom of the inner wall of the steel ladle tank and connect with the edge bricks. The thickness e of the cladding bricks decreases by 15mm to 20mm from bottom to top. The thickness e of the bottommost cladding bricks is... 边 = (0.75~0.7)d 边 , where d 边 The thickness of the edge brick is in mm.

[0012] Furthermore, the bottom of the vertically built tank bottom bricks is sequentially provided with flat tank bottom bricks, a permanent lining, and a steel ladle tank shell.

[0013] Furthermore, the thickness of the flat-laid tank bottom bricks is uniform, with a brick thickness D of 50mm to 70mm.

[0014] Furthermore, the top surface of the central brick is at the same elevation as the top surface of the steel ladle nozzle seat brick.

[0015] Furthermore, a transition brick is provided at the top of the wall brick, and the thickness of the transition brick is e. 过 >Top wall brick thickness e 顶 +20mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1) During use, the central area of ​​the ladle is in direct contact with the high-temperature molten steel, resulting in greater thermal expansion; while the peripheral areas dissipate heat more quickly. The slightly thinner design in the center helps to release concentrated thermal stress, improve thermal shock resistance, and reduce the risk of cracking caused by temperature differences.

[0018] 2) Optimize material utilization and reduce costs. Under the premise of ensuring safety, appropriately thinning the material in the central area can save on the amount of refractory material used, reduce the overall weight and manufacturing cost, and make the material distribution more scientific, thereby achieving the goal of reducing costs and increasing efficiency.

[0019] 3) Improved structural stability and erosion resistance. The gradient structure of the bottom bricks, with the thickest outer ring and the thinnest inner ring, and the thickest lower bricks and thinnest top bricks, enhances edge support, improves structural stability, and strengthens resistance to slag spillage, impact, and mechanical wear. This ensures that molten steel can be safely and completely delivered to the tundish, laying the foundation for continuous casting of multiple furnaces. The "basin-shaped" structure helps prevent molten steel leakage from the bottom and increases the steel capacity.

[0020] 4) Extended service life. More uniform stress distribution and reinforcement of key components reduce the risk of localized spalling or leakage, improving safety and extending overall service life.

[0021] 5) This gradient thickness bottom structure significantly improves the redundancy and operational stability of molten steel in the continuous casting area, mainly in three aspects: ensuring supply, stabilizing temperature, and improving purity. A more reasonable bottom transition structure also facilitates the floating of slag inclusions and prevents slag entrapment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the steel ladle tank bottom masonry structure with gradient thickness as described in this utility model.

[0023] Figure 2 This is a top view of the steel ladle tank bottom masonry structure with gradient thickness as described in this utility model.

[0024] In the diagram: 1. Vertically laid tank bottom bricks; 2. Flat-laid tank bottom bricks; 3. Wall bricks; 4. Transition bricks; 5. Steel ladle nozzle seat bricks; 6. Permanent lining; 7. Steel ladle tank shell; 8. Center bricks; 9. Middle bricks; 10. Edge bricks; d 边 , edge brick thickness; d 间 , thickness of intermediate bricks; d 中 , thickness of the center brick; e 边 The thickness of the bottom layer of wall bricks; e 间 , thickness of intermediate wall bricks; e 顶 , thickness of the top wall bricks; e 过 , thickness of transition bricks. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0026] like Figures 1-2As shown, a steel ladle tank bottom masonry structure with a gradient thickness includes a ladle nozzle seat brick 5, vertical tank bottom bricks 1, and tank wall bricks 3. The vertical tank bottom bricks 1 include a center brick 8, intermediate bricks 9, and edge bricks 10. The center bricks 8, intermediate bricks 9, and edge bricks 10 are laid in a ring around the edge of the ladle tank bottom, with the ladle nozzle seat brick 5 as the center. The center brick 8 extends outward from the ladle nozzle seat brick 5 for 300mm to 600mm, and the top surface of the center brick 8 is at the same elevation as the top surface of the ladle nozzle seat brick 5. The intermediate bricks 9 extend outward from the center bricks for 300mm to 700mm. The edge bricks 10 extend outward from the intermediate bricks 9 to the perimeter of the tank bottom. The thickness d of the center bricks 8, intermediate bricks 9, and edge bricks 10 increases by 30mm to 40mm respectively. The central area is in direct contact with high-temperature molten steel, resulting in greater thermal expansion; while the edge area dissipates heat more quickly. The slightly thinner design in the center helps release concentrated thermal stress, improves thermal shock resistance, and reduces the risk of cracking due to temperature differences. The bottom of the vertically laid tank bottom brick 1 is sequentially arranged with flat tank bottom brick 2, permanent lining 6, and steel ladle tank shell 7. The flat tank bottom brick 2 has a uniform thickness, with a thickness D of 50mm to 70mm.

[0027] The wall-mounting bricks 3 are installed at the bottom of the inner wall of the steel ladle tank and connect with the edge bricks 10. The thickness e of the wall-mounting bricks 3 decreases by 15mm to 20mm from bottom to top, with the thickness e of the bottommost wall-mounting bricks 3 being the smallest. 边 = (0.75~0.7)d 边 , where d 边 The thickness of the edge brick is in mm. A transition brick 4 is placed on top of the wall brick 3. The thickness of the transition brick 4 is e. 过 >Top wall brick thickness e 顶 +20mm. The bottom brick of the vertical ladle is 1 brick thickest on the outer ring and thinnest in the center; the wall bricks are 3 bricks thickest at the bottom and thinnest at the top. This gradient structure enhances the edge support, improves structural stability, and strengthens the ability to resist slag dumping, impact and mechanical wear. It ensures that molten steel can be safely and completely delivered to the tundish, laying the foundation for continuous casting of multiple furnaces.

[0028] Example: This embodiment of the utility model uses a 260-ton steel ladle as an example:

[0029] like Figures 1-2 As shown, the benchmark positioning and core component installation are as follows: First, install the ladle nozzle seat brick 5, which serves as the core component of the ladle's bottom outlet channel. Its positional accuracy directly affects the subsequent brick arrangement and the stability of the outlet process. Around the ladle nozzle seat brick 5, symmetrically arrange air seat bricks (or permeable core seat bricks) for later connection to the bottom-blowing argon system, promoting uniformity of steel composition and temperature. The air seat bricks also require precise positioning, with sufficient sealing slurry gaps to prevent gas leakage. The air seat bricks are constructed around the middle bricks 9 of the vertically laid ladle bottom bricks 1, with a thickness d. 间 270mm.

[0030] Around the central area of ​​the ladle nozzle seat brick 5, the first ring is laid with the central brick 8 of the vertically laid tank bottom brick 1, with a thickness d. 中 The thickness is 230mm; a ring of intermediate bricks with a thickness of d is laid around the center area of ​​the center brick 8. 间 The bottom bricks of the vertical tank, each 270mm thick, are used as a transition zone connecting the upper and lower sections. This area both receives the molten steel flowing from the perimeter to the center and provides mechanical support to the outer ring. The outermost ring uses edge bricks with a thickness of d. 边 Thickened vertical bottom bricks (300mm thick) are laid, extending to the permanent lining (6) tightly against the side wall of the ladle. Although this area is far from the central high-temperature zone, it withstands the impact of slag dumping, mechanical collisions, and shear forces from slag cleaning operations over a long period, while also supporting the lining bricks. This gradient thickness bottom structure (300-270-230mm) of the vertical bottom bricks (1), compared to the previous uniform 270mm bottom bricks, achieves a balance between extending service life and reducing costs while ensuring the safe operation of the ladle.

[0031] The bottom of the tank wall is fitted with bottom-wall bricks of thickness e. 边 The 210mm thick wall tiles are laid together in a 3-section joint, with the middle wall tiles having a thickness of e. 间 It is 190mm thick, and the thickness of the top wall bricks is e. 顶 The wall bricks are 170mm thick, and the cladding bricks 3 are laid in a gradient from bottom to top, making the structure more stable. A transition brick 4, with a thickness of e, is laid on top of the wall bricks 3. 过 It is 190mm. The transition brick 4 is widened to improve the support of the slag line brick.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A steel ladle tank bottom masonry structure with a gradient thickness, comprising steel ladle nozzle seat bricks, vertically laid tank bottom bricks, and cladding wall bricks, characterized in that, The vertical lining bricks for the tank bottom include center bricks, intermediate bricks, and edge bricks. Center bricks, intermediate bricks, and edge bricks are laid in a ring around the bottom edge of the ladle tank, with the center brick extending 300mm-600mm outwards from the ladle nozzle brick. Intermediate bricks connect to the center bricks and extend outwards 300mm-700mm outwards. Edge bricks connect to the intermediate bricks and extend to the perimeter of the tank bottom. The thickness d of the center bricks, intermediate bricks, and edge bricks increases by 30mm-40mm sequentially. The wall-mounting bricks are placed at the bottom of the inner wall of the ladle tank and connect with the edge bricks. The thickness e of the wall-mounting bricks decreases by 15mm-20mm from bottom to top, with the thickness e of the bottommost wall-mounting bricks decreasing sequentially. 边 = (0.75~0.7)d 边 , where d 边 The thickness of the edge brick is in mm.

2. The steel ladle tank bottom masonry structure with a gradient thickness structure according to claim 1, characterized in that, The bottom of the vertically built tank bottom bricks is sequentially provided with flat tank bottom bricks, a permanent lining, and a steel ladle tank shell.

3. The steel ladle tank bottom lining structure with a gradient thickness structure according to claim 2, characterized in that, The thickness of the flat-laid tank bottom bricks is uniform, with a brick thickness D of 50mm to 70mm.

4. The steel ladle tank bottom lining structure with gradient thickness according to claim 1, characterized in that, The top surface of the central brick is at the same elevation as the top surface of the steel ladle nozzle seat brick.

5. The steel ladle tank bottom masonry structure with a gradient thickness structure according to claim 1, characterized in that, A transition brick is provided at the top of the wall bricks, and the thickness of the transition brick is e. 过 >Top wall brick thickness e 顶 +20mm.

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