High-performance monolithic gas-permeable brick and ladle

Abstract

The utility model relates to the technical field of air brick, disclose a kind of high-performance monolithic air brick, including air brick core, seat brick and sintered protective sleeve, the cavity for accommodating air brick core is equipped in protective sleeve inside, and air brick core is located in the cavity of protective sleeve, seat brick is casted and formed in the outside of protective sleeve, and the same end of protective sleeve and air brick core is extended to the outside of seat brick, and the same end of protective sleeve and air brick core is wrapped in the inside of seat brick;Ventilation component is provided on seat brick, and ventilation component is used to ventilate the end face of air brick core located in the inside of seat brick one end.The utility model can slow down the speed of seat brick being eroded by molten steel.

Description

Technical Field

[0001] This utility model relates to the field of breathable brick technology, and in particular to a high-performance integral breathable brick and steel ladle. Background Technology

[0002] The ladle (also known as a steel container or molten steel ladle) is the core container in the continuous casting process. It is used to transport molten steel from tapping to pouring and to support refining operations (such as deoxidation and alloying). Its outer shell is made of cast steel, while the inner lining is constructed with multiple layers of refractory materials to withstand high temperatures and mechanical erosion.

[0003] With the sustained and rapid development of the national economy, my country's basic industries have made rapid progress, leading to an increasing demand for various special steels and critical steel products. The smelting of special steels has resulted in the increasing prevalence of ladle refining, and the refining process is becoming longer. This has led to increasingly stringent requirements for permeable brick products, demanding not only long service life and good corrosion resistance, but also a sufficiently high blow-through rate.

[0004] Integral permeable bricks are key refractory components used in bottom-blown argon refining of steel ladles. Their core lies in prefabricating the permeable components and protective structure into a non-removable, integral unit. A permeable brick consists of a core and a base brick located outside the core. The core is typically made of high-purity, high-density monolithic refractories (such as zirconia-toughened chromium corundum mullite), which are fired at high temperatures to form a microporous structure or directional slit channels, ensuring permeability and resisting molten steel penetration.

[0005] During use, the core of the permeable brick erodes quickly, and the erosion rate of the seat brick adjacent to the core is also relatively fast, forming an inverted frustum-shaped pit. When the seat brick adjacent to the core erodes too quickly, it will cause the seat brick to have larger pores, resulting in more cold steel during use. When there is more cold steel, the labor intensity of hot repair workers is greater and it will affect the argon blowing effect of the permeable brick. Utility Model Content

[0006] This application discloses a high-performance integral permeable brick and steel ladle to solve the problem of rapid erosion of the seat brick around the brick core in integral permeable bricks in related technologies.

[0007] To solve the above problems, the present invention adopts the following technical solution:

[0008] In a first aspect, this utility model discloses a high-performance integral permeable brick, including a permeable brick core, a seat brick, and a sintered protective sleeve. The protective sleeve has a cavity inside for accommodating the permeable brick core, and the permeable brick core is located inside the cavity of the protective sleeve. The seat brick is cast and formed outside the protective sleeve. One end of the protective sleeve and the permeable brick core extends to the outside of the seat brick, and the other end of the protective sleeve and the permeable brick core is wrapped inside the seat brick. A ventilation component is provided on the seat brick, which is used to ventilate the end face of the permeable brick core located inside the seat brick.

[0009] Furthermore, a sealing layer is provided between the outer wall of the breathable brick core and the inner wall of the protective sleeve.

[0010] Furthermore, the sealing layer is a corundum fire clay layer.

[0011] Furthermore, the protective sleeve is a conical structure with openings at both ends, and the breathable brick core is a frustum shape. The protective sleeve and the breathable brick core are matched accordingly. The smaller end faces of both the breathable brick core and the protective sleeve extend to the outside of the seat brick, while the larger end faces are wrapped inside the seat brick.

[0012] Furthermore, the ventilation component includes an abutment ring, a base plate, and a ventilation pipe. Both the abutment ring and the base plate are located inside the seat brick. The abutment ring abuts against one end face of the permeable brick core located inside the seat brick. The base plate is located on the side of the abutment ring away from the permeable brick core. A connecting port is provided on the base plate, which corresponds to the inner ring of the abutment ring. The connecting port of the base plate is connected to one end of the ventilation pipe. The end of the ventilation pipe away from the base plate passes through the seat brick and extends to the outside of the seat brick.

[0013] Furthermore, an anchoring ring is fitted on the outer wall of the protective sleeve, and the anchoring ring is located inside the seat brick.

[0014] Furthermore, the protective sleeve and the anchoring ring are integrally sintered together.

[0015] Furthermore, the inner wall of the protective sleeve is provided with an annular groove along the circumference, the larger end face of the breathable brick core extends to the annular groove, and the bottom plate is located at the corresponding part of the inner circle of the annular groove, and the seat brick fills and extends into the interior of the annular groove; one side of the abutting ring abuts against the breathable brick core, and the other side abuts against the bottom plate.

[0016] Furthermore, multiple anchoring rings are provided, and the multiple anchoring rings are spaced apart on the outside of the protective sleeve along the length of the central axis of the protective sleeve, with the central axis of the multiple anchoring rings coinciding with the central axis of the protective sleeve.

[0017] Secondly, this utility model also discloses a steel ladle, including a steel ladle body and the aforementioned high-performance integral permeable brick, wherein the high-performance integral permeable brick is located at the bottom of the steel ladle body.

[0018] The technical solution adopted in this utility model can achieve the following beneficial effects:

[0019] 1. In this utility model, the protective sleeve can be made of ceramic material sintered at 1600 degrees Celsius. Because the protective sleeve is pre-fired at high temperature, its stability is better than that of low-temperature prefabricated products. During the use of the integral permeable brick, the core of the permeable brick gradually erodes and forms holes or grooves. Due to the high strength and good erosion resistance of the protective sleeve, the enlarged holes formed by the seat brick during use are smaller, which improves the erosion resistance of the seat brick. After the molten steel is poured, there is less cold steel in the groove at the smaller end of the permeable brick core. The labor intensity of the workers during oxygen burning is lower. At the same time, with less cold steel, the probability of the permeable brick being blocked is also lower, and the argon blowing effect during steel refining is better, which is conducive to improving the blowing rate of the permeable brick.

[0020] 2. In this utility model, after the seat brick is cast and formed, the protective sleeve and the seat brick are riveted together, and the seat brick and the protective sleeve are more tightly locked, making it less likely to crack, separate or fall off; at the same time, the locking part between the protective sleeve and the seat brick can also form a multi-layer curved seal structure, which can further prevent molten steel from seeping down.

[0021] 3. In this utility model, since fire mortar is used to fill the gap between the protective sleeve and the breathable brick core, the expansion stress of the breathable brick core and the thermal stress of the seat brick can be effectively relieved during use. Therefore, the seat brick is less likely to crack during use, and the overall use effect is more stable.

[0022] 4. In this utility model, the inner wall of the protective sleeve is provided with a ring-shaped groove. When assembling the breathable brick core, the bottom plate is flush with the center of the ring-shaped groove. During the overall molding, the casting material of the seat brick is filled into the ring-shaped groove. On the one hand, this can make the seat brick and the protective sleeve more tightly bonded. On the other hand, the bottom of the breathable brick core is riveted in the protective sleeve, making the breathable brick core and the protective sleeve more tightly bonded and preventing the breathable brick core from moving backward. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the breathable brick structure disclosed in some embodiments of this application;

[0025] Figure 2 These are some embodiments disclosed in this application. Figure 1 Enlarged view of section A in the middle;

[0026] Figure 3 These are some embodiments disclosed in this application. Figure 1 Top view;

[0027] Figure 4 This is a schematic diagram of the structure of the protective sleeve disclosed in some embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the assembly structure of the protective sleeve and the breathable brick core disclosed in some embodiments of this application.

[0029] In the picture:

[0030] 1. Breathable brick core; 2. Sealing brick; 3. Protective sleeve; 4. Sealing layer; 5. Abutment ring; 6. Base plate; 7. Ventilation pipe; 8. Connecting port; 9. Anchoring ring; 10. Annular groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] Argon blowing in molten steel is a core process in ladle refining: the rising argon bubbles generate strong stirring force, eliminating temperature gradients in the molten steel, ensuring uniform distribution of alloying elements, and preventing segregation; the stirring efficiency is 5-8 times higher than natural convection, and the mixing time can be shortened to 3-5 minutes; argon bubbles adsorb dissolved hydrogen, nitrogen, and other gases, which rise to the slag layer and are discharged, achieving a dehydrogenation rate of 30%-50%; argon gas can also promote the collision and polymerization of micron-sized inclusions (Al2O3, SiO2, etc.), increasing the rising speed by 2-3 times; the inert gas prevents secondary oxidation, making it particularly suitable for refining aluminum-deoxidized steel grades (such as IF steel); it can replace part of vacuum treatment, reducing equipment costs by more than 60%. However, argon blowing in molten steel typically requires the use of permeable bricks. Among these, the core portion of the integral permeable brick erodes rapidly during use, for reasons including:

[0034] 1. Thermal stress impact: The working surface of the brick core is in direct contact with high-temperature molten steel, while the argon gas blown in is at room temperature (20~30℃). The alternating hot and cold temperatures create a large temperature gradient, causing the brick core to develop ring-shaped cracks and peel off. After repeated use, the rapid cooling and heating cycles exacerbate the crack propagation, especially at the gas outlet where thermal stress is concentrated.

[0035] 2. Mechanical scouring effect: The high-speed molten steel flow (5~8m / s) and argon bubbles form a two-phase turbulent flow, which generates a strong shear force on the brick core. The part higher than the seat brick may be scoured off after a single use; when the argon blowing pressure increases, the reverse impact strength is significantly improved (e.g., the impact force can reach 3 times that of the conventional force under a pressure of 0.4MPa).

[0036] 3. Chemical erosion mechanism: Oxides such as MnO and FeO in steel slag react with corundum in the brick core to form low-melting-point substances (such as FeO·Al2O3), which lower the melting point to below 1200℃, accelerating structural damage; the permeated molten steel forms a conical steel-clad layer (the thickness can be up to twice the diameter of the gas channel) in the gas channel, which blocks the gas channel and causes spalling.

[0037] When the permeable brick core 1 is eroded, the area of ​​the surrounding seat bricks 2 exposed to the molten steel also increases accordingly. This naturally leads to faster erosion and increased pore size of the seat bricks 2, which in turn leads to the formation of more cold steel and increases the workload of hot repair.

[0038] The following is in conjunction with the appendix Figures 1 to 5 This application provides a detailed description of a high-performance monolithic permeable brick through specific embodiments and application scenarios.

[0039] Example 1

[0040] A high-performance integral permeable brick includes a permeable brick core 1, a seat brick 2, and a sintered protective sleeve 3. The protective sleeve 3 has a cavity inside for accommodating the permeable brick core 1, and the permeable brick core 1 is located inside the cavity of the protective sleeve 3. The seat brick 2 is cast and formed on the outside of the protective sleeve 3. One end of the protective sleeve 3 and the permeable brick core 1 extends to the outside of the seat brick 2, and the other end of the protective sleeve 3 and the permeable brick core 1 is wrapped inside the seat brick 2. A ventilation component is provided on the seat brick 2, which is used to ventilate the end face of the permeable brick core 1 located inside the seat brick 2.

[0041] In this design, the protective sleeve 3 can be made of ceramic material sintered at 1600 degrees Celsius. Because the protective sleeve 3 undergoes pre-firing at high temperatures, its stability is better than that of low-temperature prefabricated products. During use, the core 1 of the integral permeable brick gradually erodes, forming holes or grooves. Due to the high strength and good erosion resistance of the protective sleeve 3, the enlarged pores formed in the base brick 2 during use are smaller, improving the erosion resistance of the base brick 2 and slowing down the rate at which the base brick 2 is eroded by molten steel. After the molten steel is poured, there is less cold steel in the smaller end groove of the permeable brick core 1, reducing the labor intensity for workers during oxygen treatment. Simultaneously, with less cold steel, the probability of blockage in the permeable brick is lower, resulting in better argon blowing during steel refining and improving the blowing rate of the permeable brick. The thickness of the protective sleeve is controlled between 40-60mm.

[0042] Example 2

[0043] Based on Example 1, the difference in this example is that a sealing layer 4 is provided between the outer wall of the permeable brick core 1 and the inner wall of the protective sleeve 3. This sealing layer 4 is a corundum fire-clay layer, which possesses excellent adhesion and effectively resists mechanical stress. Its alumina content is higher than 90%, exhibiting strong corrosion resistance to molten steel, slag, and acidic / alkaline media. Furthermore, the corundum fire-clay layer itself does not react with reducing gases such as hydrogen and carbon monoxide, demonstrating significant chemical stability at high temperatures. Additionally, because the protective sleeve 3 and the permeable brick core 1 are assembled using fire-clay filling, the expansion stress of the permeable brick core 1 and the thermal stress of the seat brick 2 during use can be effectively alleviated. Therefore, the seat brick 2 is less prone to cracking during use, resulting in more stable overall performance. The thickness of the corundum fire-clay layer is 3-4 mm.

[0044] Example 3

[0045] Based on Example 1, the difference in this example is that the protective sleeve 3 is a conical structure with openings at both ends, and the ventilated brick core 1 is a frustum shape. The protective sleeve 3 and the ventilated brick core 1 are correspondingly fitted. The smaller end faces of both the ventilated brick core 1 and the protective sleeve 3 extend to the outside of the seat brick 2, while the larger end faces are wrapped inside the seat brick 2. The conical structure of the protective sleeve 3 and the ventilated brick core 1 reduces the probability of separation between the ventilated brick core 1 and the protective sleeve 3 during argon blowing.

[0046] Example 4

[0047] Based on Embodiment 1, the difference in this embodiment is that the ventilation assembly includes an abutment ring 5, a base plate 6, and a ventilation pipe 7. Both the abutment ring 5 and the base plate 6 are located inside the seat brick 2. The abutment ring 5 abuts against the end face of the end of the breathable brick core 1 located inside the seat ring 2. The base plate 6 is located on the side of the abutment ring 5 away from the breathable brick core 1. A connecting port 8 is provided on the base plate 6. The connecting port 8 is connected to the inner ring of the abutment ring 5. The connecting port 8 of the base plate 6 is connected to one end of the ventilation pipe 7. The end of the ventilation pipe 7 away from the base plate 6 passes through the seat brick 2 and extends to the outside of the seat brick 2.

[0048] When using permeable bricks, inert gases such as argon are delivered to the inner ring of the contact ring 5 through the vent pipe 7. This allows the argon to be delivered to the corresponding end face of the permeable brick core 1, facilitating a more uniform release of the argon into the molten steel inside the permeable brick after it diffuses within the inner ring of the contact ring 5. Specifically, after the high-pressure argon penetrates the micropores of the permeable brick core 1, it breaks into bubbles under the static pressure of the molten steel. These bubbles rise due to density differences, and during their ascent, the viscous force drives the molten steel to circulate.

[0049] Example 5

[0050] Based on Example 1, the difference in this example is that at least one anchoring ring 9 is provided on the outer wall of the protective sleeve 3. Two to three anchoring rings 9 can be provided, with a height of 20-30 mm and a thickness of 10-15 mm. All anchoring rings 9 coincide with the central axis of the protective sleeve 3 and are embedded inside the base brick 2. Specifically, the protective sleeve 3 and the anchoring rings 9 can be integrally sintered. After the base brick 2 is cast, the protective sleeve 3 and the base brick 2 are riveted together, resulting in a tighter fit between them, reducing the likelihood of cracking, separation, or detachment. Simultaneously, the engagement area between the protective sleeve 3 and the base brick 2 can form a multi-layered curved seal structure, further preventing molten steel seepage.

[0051] Example 5

[0052] Based on Embodiment 3, the difference in this embodiment is that the inner wall of the protective sleeve 3 is provided with an annular groove 10 along the circumference, wherein the central axis of the annular groove 10 coincides with the central axis of the protective sleeve 3, the larger end face of the breathable brick core 1 extends to the annular groove 10, and the bottom plate 6 is located at the corresponding part of the inner circle of the annular groove 10, and the seat brick 2 fills and extends into the interior of the annular groove 10; one side of the abutting ring 5 abuts against the breathable brick core 1, and the other side abuts against the bottom plate 6.

[0053] In this design, the inner wall of the protective sleeve 3 is provided with a ring-shaped groove 10. When assembling the breathable brick core 1, the bottom plate 6 is flush with the center of the ring-shaped groove 10. During the overall molding, the casting material of the seat brick 2 is filled into the ring-shaped groove 10. On the one hand, this makes the seat brick 2 and the protective sleeve 3 more tightly bonded. On the other hand, the bottom of the breathable brick core 1 is riveted in the protective sleeve 3, making the breathable brick core 1 and the protective sleeve 3 more tightly bonded. It also prevents the breathable brick core 1 from moving backward.

[0054] Example 6

[0055] This embodiment provides a steel ladle, including a ladle body and the aforementioned high-performance integral permeable brick, with the high-performance integral permeable brick located at the bottom of the ladle body. Argon gas is supplied to the interior of the permeable brick through a ventilation component, and the argon gas, after passing through the permeable brick, performs argon blowing treatment on the molten steel inside the ladle.

[0056] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0057] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0058] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A high performance monolithic gas permeable brick characterized in that, The device includes a breathable brick core (1), a seat brick (2), and a sintered protective sleeve (3). The protective sleeve (3) has a cavity inside for accommodating the breathable brick core (1), and the breathable brick core (1) is located inside the cavity of the protective sleeve (3). The seat brick (2) is cast and formed outside the protective sleeve (3). One end of the protective sleeve (3) and the breathable brick core (1) both extend to the outside of the seat brick (2), and the other end of the protective sleeve (3) and the breathable brick core (1) both wrap inside the seat brick (2). A ventilation component is provided on the seat brick (2), and the ventilation component is used to ventilate the end face of the breathable brick core (1) located inside the seat brick (2).

2. The high performance monolithic gas permeable brick according to claim 1, characterized in that, A sealing layer (4) is provided between the outer wall of the breathable brick core (1) and the inner wall of the protective sleeve (3).

3. A high performance monolithic gas permeable brick according to claim 2, characterized in that, The sealing layer (4) is a corundum fire clay layer.

4. The high performance monolithic gas permeable brick of claim 1, wherein, The protective sleeve (3) is a conical structure with openings at both ends. The breathable brick core (1) is frustum-shaped. The protective sleeve (3) and the breathable brick core (1) are correspondingly matched. The smaller end faces of the breathable brick core (1) and the protective sleeve (3) extend to the outside of the seat brick (2), and the larger end faces are wrapped inside the seat brick (2).

5. The high performance monolithic gas permeable brick of claim 1, wherein, The ventilation assembly includes an abutment ring (5), a base plate (6), and a ventilation pipe (7). The abutment ring (5) and the base plate (6) are both located inside the seat brick (2). The abutment ring (5) abuts against the end face of the breathable brick core (1) located inside the seat brick (2). The base plate (6) is located on the side of the abutment ring (5) away from the breathable brick core (1). A connecting port (8) is provided on the base plate (6). The connecting port (8) corresponds to the inner ring of the abutment ring (5). The connecting port (8) of the base plate (6) is connected to one end of the ventilation pipe (7). The end of the ventilation pipe (7) away from the base plate (6) passes through the seat brick (2) and extends to the outside of the seat brick (2).

6. The high performance monolithic gas permeable brick of claim 1, wherein, The outer wall of the protective sleeve (3) is fitted with an anchoring ring (9), which is located inside the seat brick (2).

7. The high performance monolithic gas permeable brick according to claim 6, characterized in that The protective sleeve (3) and the anchoring ring (9) are integrally sintered.

8. The high performance monolithic gas permeable brick according to claim 5, wherein, The inner wall of the protective sleeve (3) is provided with an annular groove (10) along the circumferential direction. The larger end face of the breathable brick core (1) extends to the annular groove (10), and the bottom plate (6) is located at the corresponding part of the inner circle of the annular groove (10). The seat brick (2) fills and extends into the interior of the annular groove (10). One side of the abutting ring (5) abuts against the breathable brick core (1), and the other side abuts against the bottom plate (6).

9. The high performance monolithic gas permeable brick according to claim 6, wherein Multiple anchoring rings (9) are provided, and the multiple anchoring rings (9) are spaced apart on the outside of the protective sleeve (3) along the length of the central axis of the protective sleeve (3). The central axis of the multiple anchoring rings (9) coincides with the central axis of the protective sleeve (3).

10. A ladle characterized by It includes a steel ladle body and a high-performance integral permeable brick as described in any one of claims 1-9, wherein the high-performance integral permeable brick is located at the bottom of the steel ladle body.

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