Erosion-resistant long-life precast block for slag line part of tundish

Abstract

The utility model relates to the technical field of steel smelting equipment, and discloses a tundish slag line part erosion-resistant long-service-life precast block which comprises a tundish shell, a boss is fixedly connected to the surface of the inner wall of the bottom of the tundish shell, a slag line assembly is arranged in the tundish shell, and the bottom of the tundish shell is fixedly connected with the boss. The slag line assembly comprises a first inserting hole, a first precast block, a second precast block and a third precast block, second inserting holes are symmetrically formed in the top surfaces of the first precast block, the second precast block and the third precast block, and trapezoidal blocks are oppositely and fixedly connected to the surfaces of the two sides of the first precast block; first trapezoidal grooves are oppositely formed in the surfaces of the two sides of the second prefabricated block correspondingly, and second trapezoidal grooves are formed in the surfaces of the two ends of the third prefabricated block correspondingly. According to the tundish slag line assembly, due to the arrangement of the slag line assembly, the risk that brick joints peel off is effectively reduced, the overall reliability of the tundish slag line part is improved, and the service life of the tundish is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of steel smelting equipment technology, and in particular to a corrosion-resistant, long-life precast block for the slag line section of the tundish. Background Technology

[0002] In the steelmaking process, the tundish serves as a transition container for molten steel from the ladle to the crystallizer. During installation, refractory bricks are laid layer by layer on the slag line of the tundish to form a protective layer. The slag line is subjected to severe erosion from the high-temperature molten steel and slag. The existing refractory materials for the slag line of the tundish are installed by dry or wet laying of refractory bricks. Dry laying involves directly stacking refractory bricks without fire mortar bonding. The advantage is that it minimizes the impact of fire mortar, but the disadvantage is that it cannot guarantee 100% tight contact between bricks. Wet laying uses fire mortar to bond the refractory bricks, which can avoid gaps. However, the use of fire mortar makes the slag line structure unstable and increases the difficulty of laying.

[0003] The two existing methods suffer from the lack of effective mechanical interlocking and bonding structures in the refractory bricks, which makes them prone to spalling and cracking during use, thus affecting the service life of the tundish and the quality stability of the molten steel. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a corrosion-resistant and long-life precast block for the slag line section of the tundish. It has the advantages of corrosion resistance and long service life, and solves the problem that the existing two methods are prone to spalling and cracking of refractory bricks during use due to the lack of effective mechanical interlocking and interlocking structures, which affects the service life of the tundish and the quality stability of molten steel.

[0005] This utility model provides the following technical solution: a corrosion-resistant, long-life precast block for the slag line section of a tundish, comprising a tundish shell, a boss fixedly connected to the bottom inner wall surface of the tundish shell, and a slag line assembly disposed inside the tundish shell. The slag line assembly includes a first insertion hole, a first precast block, a second precast block, and a third precast block. The top surfaces of the first, second, and third precast blocks are symmetrically provided with second insertion holes. Trapezoidal blocks are fixedly connected to both sides of the first precast block. First trapezoidal grooves are opened to both sides of the second precast block. Second trapezoidal grooves are opened to both ends of the third precast block. Insertion rods are symmetrically fixedly connected to the bottom surfaces of the first, second, and third precast blocks. By designing a mortise and tenon interlocking structure and a mechanically interlocking splicing method, and optimizing the shape of the precast blocks, the risk of brick joint spalling can be effectively reduced, the stress concentration coefficient can be lowered, and the crack incidence rate can be reduced, thereby improving the overall reliability and service life of the slag line section of the tundish and ensuring the stable operation of the steel smelting process.

[0006] Preferably, the first insertion holes are evenly distributed on the top surface of the boss, the third prefabricated blocks are evenly distributed in the four corners of the inner wall of the intermediate tundish shell, and the end of the third prefabricated block away from the inner wall surface of the intermediate tundish shell is an arc-shaped structure. The first insertion holes provide insertion positions for the prefabricated blocks of the bottom layer of slag line area, realize the fixed connection between the slag line area and the boss, ensure the stability of the slag line assembly in the horizontal and vertical directions, and prevent the slag line assembly from shifting or loosening during use.

[0007] Preferably, the first precast blocks are all engaged with the first trapezoidal groove by trapezoidal blocks, and the first precast blocks near the two sides of the third precast block are all engaged with the second trapezoidal groove by trapezoidal blocks. The second trapezoidal groove engages with the trapezoidal blocks of the first precast blocks near its two sides, forming a mechanical engagement with the first precast blocks, further improving the mechanical engagement structure of the slag line assembly, improving the overall stability of the slag line area, and the end away from the inner wall surface of the tundish shell is an arc-shaped structure, which can perfectly splice with the first and second precast blocks, reducing the stress concentration coefficient and reducing the crack incidence rate.

[0008] Preferably, the first and second precast blocks are staggered inside the intermediate liner shell, and the first, second, and third precast blocks form a slag line area. The trapezoidal blocks cooperate with the first trapezoidal groove of the second precast block and the second trapezoidal groove of the third precast block to achieve mechanical interlocking between the first, second, and third precast blocks, enhance the tightness of the connection between each precast block, reduce the risk of brick joint peeling, and improve the overall stability of the slag line area.

[0009] Preferably, the bottommost layer of slag line areas are all inserted into the corresponding first insertion hole via a plug-in rod, and the upper layer of slag line areas are all sequentially inserted into the corresponding second insertion hole via plug-in rods. The plug-in rods cooperate with the first insertion hole of the boss and the second insertion hole of the upper precast block to achieve the vertical positioning and fixing of the precast block, so that the multi-layer slag line areas can be stacked and installed sequentially to form a stable slag line structure that effectively resists the erosion of molten steel and slag.

[0010] Preferably, the first precast block, the second precast block, and the third precast block are all made of magnesia-carbon bricks, which have the properties of being resistant to corrosion and high temperature.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. A tenon-and-mortise interlocking structure is formed by the first insertion hole, the first precast block, the second precast block, the third precast block, and the second insertion hole. The trapezoidal blocks on both sides of the precast blocks, the first trapezoidal groove, and the second trapezoidal groove form a mechanical interlock after splicing, which greatly enhances the overall structural stability of the slag line assembly and effectively reduces the risk of brick joint peeling. At the same time, the end of the third precast block away from the inner wall surface of the tundish has an arc-shaped structure, which perfectly splices with the first and second precast blocks, reducing the stress concentration coefficient and the crack incidence rate, thereby improving the overall reliability of the slag line part of the tundish and extending the service life of the tundish.

[0013] 2. By injecting carbon-bonded magnesia slurry into the gaps between the first insertion hole, the first precast block, the second precast block, the third precast block, and the second insertion hole, the slag penetration resistance can be effectively improved after solidification. The magnesia-carbon brick itself is made of magnesia aggregate, graphite, binder, and antioxidant, and has good erosion resistance. This allows the slag line assembly to better resist erosion when in direct contact with molten steel and slag, further extending the service life of the tundish slag line section and reducing production and maintenance costs. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the second insertion hole in the structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the slag line assembly in the structure of this utility model;

[0017] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0018] In the figure: 1. Tundish shell; 2. Boss; 3. Slag line assembly; 31. First insertion hole; 32. First precast block; 33. Second precast block; 34. Third precast block; 35. Second insertion hole; 36. Trapezoidal block; 37. First trapezoidal groove; 38. Second trapezoidal groove; 39. Insertion rod. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 - Figure 4This utility model provides an embodiment of a corrosion-resistant, long-life prefabricated block for the slag line section of a tundish, comprising a tundish shell 1. A boss 2 is fixedly connected to the bottom inner wall surface of the tundish shell 1, providing an installation base for the slag line assembly 3. First insertion holes 31 are evenly distributed on the top of the boss 2, cooperating with the insertion rods 39 in the slag line assembly 3 to achieve initial positioning and fixation of the slag line assembly 3, enhancing the connection strength between the slag line assembly 3 and the tundish shell 1, and preventing displacement of the slag line assembly 3 during use. The slag line assembly 3 is disposed inside the tundish shell 1, and includes the first insertion hole 31, a first prefabricated block 32, a second prefabricated block 33, and a third prefabricated block 34. The first prefabricated block 32, the second prefabricated block 33, and the... The top surface of the third precast block 34 is symmetrically provided with second insertion holes 35. Trapezoidal blocks 36 are fixedly connected to both sides of the first precast block 32. First trapezoidal grooves 37 are opened on both sides of the second precast block 33. Second trapezoidal grooves 38 are opened on both ends of the third precast block 34. Insertion rods 39 are symmetrically fixedly connected to the bottom surfaces of the first, second, and third precast blocks 32, 33, and 34. First insertion holes 31 are evenly distributed on the top surface of the boss 2. The third precast blocks 34 are evenly distributed at the four corners inside the intermediate shell 1. The end of the third precast block 34 away from the inner wall of the intermediate shell 1 is an arc-shaped structure. The first precast blocks 32 are all snapped into the first trapezoidal blocks 36. Inside the groove 37, the first precast blocks 32 near the sides of the third precast block 34 are all engaged with the second trapezoidal groove 38 by trapezoidal blocks 36. The first precast blocks 32 and the second precast blocks 33 are staggered inside the intermediate shell 1. The first precast blocks 32, the second precast blocks 33 and the third precast blocks 34 form a layer of slag line area. The bottom layer of slag line area is all inserted into the corresponding first insertion hole 31 by insertion rods 39. The upper layer of slag line area of ​​the bottom layer is all sequentially inserted into the corresponding second insertion hole 35 by insertion rods 39. The first insertion hole 31, the first precast block 32, the second precast block 33, the third precast block 34 and the second insertion hole 35 form a mortise and tenon interlocking structure. 32. The trapezoidal blocks 36, the first trapezoidal groove 37, and the second trapezoidal groove 38 provided on both sides of the second precast block 33 and the third precast block 34 enable the first precast block 32, the second precast block 33, and the third precast block 34 to form a mechanical interlock after splicing, thereby reducing the risk of brick joint peeling. The end of the inner wall surface of the third precast block 34 away from the intermediate shell 1 is an arc structure, which can perfectly splice with the first precast block 32 and the second precast block 33, thereby reducing the stress concentration coefficient and reducing the cracking rate. Carbon-bonded magnesium slurry is injected into the gaps of the first insertion hole 31, the first precast block 32, the second precast block 33, the third precast block 34, and the second insertion hole 35, which can improve the slag penetration resistance after solidification.

[0021] Please see Figure 1- Figure 4 The first precast block 32, the second precast block 33, and the third precast block 34 are all made of magnesia-carbon bricks. Magnesia-carbon bricks are made from a mixture of magnesia aggregate, graphite, binder, and antioxidant. Fused magnesia is the main raw material for magnesia-carbon bricks. Fused magnesia has advantages such as large periclase crystal grains and high particle volume density, making it the primary material for producing magnesia-carbon bricks. Graphite is another major raw material for magnesia-carbon bricks. Flake graphite is a commonly used carbon source and has excellent physical properties, such as non-wetting properties against slag, high thermal conductivity, and low thermal expansion. The binder is used to bind the raw materials together. Phenolic resin is currently the main raw material for producing magnesia-carbon bricks. The binder should have the characteristics of high residual carbon rate after carbonization and the ability to form a good network structure, which helps to improve the strength and oxidation resistance of magnesia-carbon bricks. The use of metallic aluminum powder as an antioxidant can improve the oxidation resistance of magnesia-carbon bricks. The working principle of the antioxidant includes being preferentially oxidized before carbon at the working temperature, thereby protecting carbon from oxidation, and changing the microstructure of carbon composite refractory materials, increasing density, blocking pores, and hindering the diffusion of oxygen and reaction products. The products of the antioxidant after oxidation produce volume expansion and block pores, which can effectively protect the graphite in magnesia-carbon bricks from further oxidation and improve the slag resistance of magnesia-carbon bricks.

[0022] Working principle: In use, the tundish shell 1 serves as the overall support structure. The bosses 2 on the inner surface of its bottom provide the installation base for the slag line assembly 3. When installing the slag line assembly 3, the bottommost slag line area is assembled first. The third precast block 34 is evenly distributed at the four corners inside the tundish shell 1. The end away from the inner surface of the tundish shell 1 has an arc-shaped structure. The trapezoidal blocks 36 on both sides of the first precast block 32 engage with the first trapezoidal grooves 37 on both sides of the second precast block 33. The trapezoidal blocks 36 of the first precast block 32 near the sides of the third precast block 34 engage with the second trapezoidal grooves 38 at both ends of the third precast block 34, so that the first precast block 32, the second precast block 33 and the third precast block 34 are spliced ​​together and combined. The first precast block 32 and the second precast block 33 are staggered to form a slag line area. The insertion rod 39 at the bottom of the slag line is inserted into the first insertion hole 31 evenly opened on the top surface of the boss 2 to fix the slag line area. When it is necessary to increase the number of slag line areas, the first precast block 32, the second precast block 33 and the third precast block 34 of the upper slag line area are also combined in the above splicing method. After the combination, the insertion rod 39 at the bottom of the assembly is inserted into the second insertion hole 35 evenly opened on the top surface of the corresponding first precast block 32, the second precast block 33 and the third precast block 34 of the lower layer. They are installed in sequence to form a multi-layer slag line area. During the use of the tundish, the slag line assembly 3 is in direct contact with molten steel and slag. Since the first precast block 32, the second precast block 33 and the third precast block 34 are all made of magnesia-carbon bricks with good corrosion resistance, they can effectively resist the corrosion of molten steel and slag, thereby extending the service life of the slag line part of the tundish.

Claims

1. A corrosion-resistant, long-life precast block for the slag line section of a tundish, comprising a tundish shell (1), characterized in that: The bottom inner wall surface of the intermediate tundish housing (1) is fixedly connected to a boss (2), and a slag line assembly (3) is provided inside the intermediate tundish housing (1). The slag line assembly (3) includes a first insertion hole (31), a first precast block (32), a second precast block (33), and a third precast block (34). The top surfaces of the first precast block (32), the second precast block (33), and the third precast block (34) are symmetrically provided with second insertion holes (35). The two sides of the first precast block (32) are respectively fixedly connected with trapezoidal blocks (36). The two sides of the second precast block (33) are respectively provided with first trapezoidal grooves (37). The two ends of the third precast block (34) are respectively provided with second trapezoidal grooves (38). The bottom surfaces of the first precast block (32), the second precast block (33), and the third precast block (34) are respectively symmetrically fixedly connected with insertion rods (39).

2. The erosion-resistant, long-life precast block for the slag line section of the intermediate bale according to claim 1, characterized in that: The first insertion hole (31) is evenly opened on the top surface of the boss (2), and the third prefabricated block (34) is evenly distributed in the four corners inside the intermediate shell (1). The end of the third prefabricated block (34) away from the inner wall surface of the intermediate shell (1) is an arc structure.

3. The erosion-resistant, long-life precast block for the slag line section of the intermediate bale according to claim 1, characterized in that: The first precast blocks (32) are all engaged with the inside of the first trapezoidal groove (37) by trapezoidal blocks (36), and the first precast blocks (32) near the sides of the third precast block (34) are all engaged with the inside of the second trapezoidal groove (38) by trapezoidal blocks (36).

4. The erosion-resistant, long-life precast block for the slag line section of the intermediate bale according to claim 1, characterized in that: The first precast block (32) and the second precast block (33) are staggered inside the intermediate tundish shell (1), and the first precast block (32), the second precast block (33) and the third precast block (34) form a slag line area.

5. The erosion-resistant, long-life precast block for the slag line section of the intermediate bale according to claim 4, characterized in that: The bottommost layer of slag line area is inserted into the corresponding first insertion hole (31) through the insertion rod (39), and the upper layer of slag line area of ​​the bottommost layer is inserted into the corresponding second insertion hole (35) through the insertion rod (39) in sequence.

6. The erosion-resistant, long-life precast block for the slag line section of the intermediate bale according to claim 1, characterized in that: The first precast block (32), the second precast block (33) and the third precast block (34) are all made of magnesia-carbon bricks.

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