A steel ladle casting bottom structure

Abstract

This utility model relates to a ladle casting bottom structure, comprising: a permanent bottom lining, at least one layer of slag line bricks, a ring working lining, a nozzle seat brick, a permeable brick, a surrounding brick layer, a casting bottom lining, a casting interlayer, and a ring wall permanent lining. The beneficial effects of this utility model are: it solves the problem of brick joint erosion caused by molten steel impact; the structural improvements help improve construction efficiency and reduce maintenance costs; the structural improvements help improve steel yield; the structural improvements help improve structural strength and durability; the ladle casting bottom structure is primarily a movable bottom casting structure, which is convenient to construct and easy to repair, allowing for localized excavation and repair; in actual use, this ladle casting bottom structure has a long service life and can be used continuously for more than 80 steelmaking processes at once; this ladle casting bottom structure is suitable for bottoms constructed with shaped brick masonry.

Description

Technical Field

[0001] This utility model belongs to the field of steelmaking technology, and in particular relates to a ladle bottom structure for steel ladle casting. Background Technology

[0002] Currently, the low-carbon and carbon-free steel ladles used in steelmaking systems mainly include cast-in-place ladles and precast ladles. The ladle bottoms also include cast-in-place and brick-built bottoms. However, due to the relatively low efficiency of cast-in-place bottoms, there is considerable debate within the industry regarding their application. Furthermore, during the tapping process, molten steel possesses strong impact energy when falling into the ladle. Without protection at the contact points within the ladle, the scattered molten steel directly impacts the working lining bricks, causing erosion and widening of the brick joints and leading to steel drilling.

[0003] The invention patent with publication number CN108971471A, entitled "A Construction Process for Carbon-Free Steel Ladle Composite Bottom", designs a three-layer bottom structure: the first layer is a permanent pouring layer + the second layer is a pouring bottom layer + the third layer (top layer) is a carbon-free precast brick masonry working layer. The carbon-free precast bricks in the third layer can be partially replaced and patched. However, when repairing the three-layer bottom structure, the carbon-free precast brick masonry working layer in the top layer basically has to be removed, and new bricks are directly laid on the pouring material of the second working layer.

[0004] The invention application CN118455501A, entitled "A Steel Ladle Structure and Its Construction Method," employs an inclined bottom casting method to improve steel recovery, placing multiple precast blocks at the bottom to reduce residual molten steel. However, when using this inclined bottom casting method, the molten steel often disperses directly around the ladle due to its impact kinetic energy, severely impacting the ring bricks, especially the joints between the ring brick layers, leading to safety hazards such as steel entrapment and penetration. Furthermore, although the inclined bottom casting method is technically simple, it is difficult to simultaneously perform protective construction of the joints at the contact point with the ring bricks during the bottom casting process.

[0005] In summary, further optimization is needed to improve the safety of the steel ladle bottom process while also ensuring ease of construction. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a ladle bottom structure for steel ladle casting.

[0007] This steel ladle casting bottom structure includes: a permanent bottom lining, at least one layer of slag line bricks, a ring working lining, a nozzle seat brick, a permeable brick, a surrounding brick layer, a casting bottom lining, a casting interlayer, and a ring wall permanent lining;

[0008] The bottom permanent lining is located at the bottom of the ladle; the top of the outer edge of the bottom permanent lining is at least one layer of slag line bricks; the transverse length of the slag line bricks is 6cm to 17cm longer than the transverse length of the ring working lining, leaving reasonable space for the surrounding bricks; the outer edge of the slag line bricks is provided with a ring wall permanent lining, which is located at the outermost edge of the bottom permanent lining.

[0009] The top of the central part of the permanent lining is provided with a cast-in lining. The sprue seat brick and the permeable brick are embedded in the cast-in lining and the permanent lining from top to bottom. The sprue seat brick and the permeable brick are separated by a composite layer of the cast-in lining and the permanent lining.

[0010] When the slag line bricks are only one layer: a surrounding brick layer is built on the top plane of one side of the slag line bricks, with the slag line bricks serving as the base of the surrounding brick layer (therefore, a lower height of the surrounding bricks can also achieve the purpose). A ring working lining is built on the top plane of the other side of the slag line bricks. There is a certain gap between the surrounding brick layer and the ring working lining. A casting interlayer is set within the gap between the surrounding brick layer and the ring working lining (the masonry space is reasonable). The width of the outer arc side of the surrounding brick layer is greater than the width of the inner arc side, which facilitates the tight fit between the bricks. The outer arc side of the surrounding brick layer is joined to the top plane of the casting lining. Expansion sand is filled between the outer arc side of the surrounding brick layer and the top section of the casting lining, preventing the surrounding bricks from moving towards their own outer arc side and positioning them to ensure the tightness and safety of the surrounding brick ring masonry.

[0011] When the slag line bricks are multi-layered: a surrounding brick layer is built on the top plane of one side of the bottom slag line brick, and a working lining is built on the top plane of one side of the top slag line brick. There is a certain gap between the surrounding brick layer and the working lining. A casting interlayer is set in the gap between the surrounding brick layer and the working lining (the masonry space is reasonable). The bottom shape of the casting interlayer matches the shape of the inward side of the bottom slag line brick and the top slag line brick and stands on the part from the bottom slag line brick to the inward side of the top slag line brick. The outer arc side width of the surrounding brick layer is greater than the inner arc side width, which facilitates the tight fit between the bricks. The outer arc side of the surrounding brick layer is higher than the top plane of the casting lining by a certain height. The inner arc side of the surrounding brick layer is flush with the top plane of the casting interlayer.

[0012] The top surface of the surrounding brick layer is not directly opposite the brick joint of the working liner, and the surrounding brick layer can block the brick joint of 1 to 5 layers of working liner in the vertical direction. This prevents the molten steel falling into the ladle from directly scouring the brick joint of the shaped brick of the working liner when the ladle is put into use, and prevents the molten steel from penetrating the steel or the residual thickness from failing to meet the service life requirements of the working liner.

[0013] As a preferred embodiment, the slag line bricks consist of two layers: slag line brick A and slag line brick B. Slag line brick B is located below slag line brick A, and the lateral length of slag line brick B exceeds the lateral length of slag line brick A by 1cm to 5cm. The lateral length of slag line brick A exceeds the bottom length of the ring working liner by 5cm to 12cm.

[0014] As a preferred configuration, the area around the top of the nozzle seat brick is lower than the upper surface of the casting lining, forming a concave area. The upper surface of the casting lining is higher than the area around the top of the nozzle seat brick, forming a convex plateau. An inclined annular transition zone is formed between the convex plateau and the concave area, which serves as a connection. The arrangement of the convex plateau, transition zone and concave area is conducive to the priority flow of qualified molten steel into the nozzle and out of the ladle as much as possible, so as to make full use of it, reduce excess steel and improve the molten steel yield.

[0015] The outer edge of the top of the water inlet seat brick is stepped due to the height difference between the high platform area, the transition area and the low depression area.

[0016] Preferably, the concave area is triangular fan-shaped, and its area accounts for 1 / 4 of the total area of ​​the ladle.

[0017] Preferably, the nozzle seat brick includes an upper seat brick located above it and a lower seat brick located below it. The upper seat brick has a funnel-shaped molten steel channel inside, and the lower seat brick has a trapezoidal molten steel channel inside. The bottom of the funnel-shaped molten steel channel is connected to the top of the trapezoidal molten steel channel. The combination of the funnel-shaped molten steel channel and the trapezoidal molten steel channel forms a molten steel channel that can gradually change the molten steel flow rate to reduce the risk of swirling.

[0018] As a preferred embodiment, the inner and outer ring sides of the brick layer are provided with 1 to 3 embedded functional grooves. The outer ring side of the embedded functional groove is embedded in the casting lining and the casting interlayer. The contact surfaces of the casting lining and the casting interlayer with the inner and outer ring sides of the brick layer are provided with structures that match the shape of the embedded functional grooves. This allows the brick layer, the casting lining, and the casting interlayer to be embedded and connected to form a whole. This ensures that individual components do not slip off while dividing the mating surface into several tortuous segments. It also prevents molten steel from seeping into the gaps between the brick layer, the casting lining, and the casting interlayer. The height of the lowest embedded functional groove on the inner arc side of the brick layer is lower than the height of the lowest embedded functional groove on the outer arc side of the brick layer. This ensures the safety of the casting lining, the casting interlayer, and the brick layer, and improves the application safety factor of the ladle bottom, ensuring steelmaking safety and extending the service life of the casting lining, the casting interlayer, and the brick layer.

[0019] Preferably, the embedded functional groove is a raised groove and / or a recessed groove, and the inner and outer ring sides of the casting lining and casting interlayer are provided with raised grooves and / or recesses that match the shape of the embedded functional groove.

[0020] As a preferred option, the surrounding brick layer is made of aluminum-magnesium-carbon brick, corundum-carbon brick or corundum spinel precast brick, and the ring working lining is made of low-carbon magnesium-carbon brick.

[0021] As a preferred embodiment, the top of the ring working liner is provided with a rim brick, and the top of the rim brick is provided with a pouring layer.

[0022] The beneficial effects of this utility model are:

[0023] The problem of brick joint erosion caused by molten steel impact has been solved: the outer arc side of the surrounding brick layer is wider than the inner arc side, and the brick joints of 1 to 5 layers of working lining are blocked vertically, which can prevent molten steel from directly impacting the brick joints of the working lining, prevent steel drilling and clamping, and extend the service life of the working lining; the transverse length of the slag line brick is longer than that of the working lining to reserve masonry space for the surrounding brick layer, and the slag line brick serves as the base of the surrounding brick layer, which can reduce the risk of displacement of the surrounding brick layer due to thermal expansion or mechanical stress and enhance the overall stability.

[0024] Structural improvements help increase construction efficiency and reduce maintenance costs: When the slag line bricks are multi-layered, the shape of the casting interlayer matches the inner side of the multi-layered slag line bricks, and the casting interlayer is set between the surrounding brick layer and the ring working lining, which simplifies the masonry of multi-layered structures and avoids the cumbersome operation of removing the top layer bricks during traditional repairs; the surrounding brick layer is connected to the casting lining and casting interlayer by embedding functional grooves, which can reduce construction gaps, improve the overall integrity of the bottom layer, and reduce maintenance frequency;

[0025] Structural improvements help to increase steel yield: the top of the nozzle seat brick is equipped with a high platform area, a transition area and a low concave area to guide the molten steel to flow into the nozzle first and reduce molten steel residue; the combination of funnel-shaped and trapezoidal channels in the nozzle seat brick reduces the risk of molten steel swirling, avoids molten steel impacting the weak area of ​​the ladle bottom, and reduces structural damage caused by scouring.

[0026] Structural improvements help enhance structural strength and durability: the brick layer and the cast-in-place lining and casting interlayer are inlaid with convex / recessed grooves, and the joint surface is divided into a tortuous section, which can prevent molten steel from seeping into the gap, improve impermeability, and extend the service life of the ladle bottom; the brick layer uses alumina-magnesia-carbon bricks or corundum-carbon bricks, and the ring working lining uses low-carbon magnesia-carbon bricks, which can improve thermal shock resistance and slag resistance, and adapt to the complex working conditions of the ladle.

[0027] The steel ladle casting bottom structure is mainly a movable bottom casting structure. This structure is convenient to construct and easy to repair, and can be repaired by partial excavation. In actual use, the steel ladle casting bottom structure has a long service life and can be used continuously for more than 80 steelmaking processes at one time. This steel ladle casting bottom structure is suitable for the bottom of the structure built with shaped brick masonry. Attached Figure Description

[0028] Figure 1 A schematic diagram of the ladle bottom structure when the slag line brick is only one layer;

[0029] Figure 2 A schematic diagram of the ladle bottom structure when the slag line bricks include two layers: slag line brick A and slag line brick B;

[0030] Figure 3 A schematic diagram of the grooves and protrusions on the brick layer;

[0031] Figure 4 This is a schematic diagram of the structure of the concave area, the convex area, and the inclined annular surface transition area.

[0032] Explanation of reference numerals in the attached drawings: 1. Permanent lining at the bottom; 2. Slag line brick A; 3. Ring working lining; 4. Nozzle seat brick; 5. Permeable brick; 6. Surrounding brick layer; 7. Casting bottom lining; 8. Casting interlayer; 11. Permanent lining of the ring wall; 12. Slag line brick B; 13. Tank rim brick; 14. Outer arc side; 15. Inner arc side; 16. Groove; 17. Recess; 18. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0034] Example 1

[0035] like Figure 1 As shown, a steel ladle casting bottom structure includes a bottom permanent lining 1, a layer of slag line bricks A2, an annular working lining 3, a nozzle seat brick 4, a permeable brick 5, a surrounding brick layer 6, a casting bottom lining 7, a casting interlayer 8, and an annular wall permanent lining 11.

[0036] The bottom permanent lining 1 is located at the bottom of the ladle; the transverse length of the slag line brick A2 is 6cm longer than the transverse length of the ring working lining 3, leaving a reasonable space for the surrounding bricks; the outer edge of the slag line brick A2 is provided with a ring wall permanent lining 11 with a thickness of 6cm, and the ring wall permanent lining 11 is located at the outermost edge of the top of the bottom permanent lining 1.

[0037] The top of the central part of the permanent liner 1 is provided with a 20cm thick castable liner 7. The sprue seat brick 4 and the permeable brick 5 are embedded in the castable liner 7 and the permanent liner 1 from top to bottom. The sprue seat brick 4 and the permeable brick 5 are separated by a composite layer of the castable liner 7 and the permanent liner 1.

[0038] A surrounding brick layer 6 is built on the top plane of one side of the slag line brick A2, with the slag line brick serving as the base of the surrounding brick layer (therefore, a lower height of the surrounding brick can also achieve the purpose). A ring working liner 3 is built on the top plane of the other side of the slag line brick A2. There is a 5cm gap between the surrounding brick layer 6 and the ring working liner 3. A casting interlayer 8 is set in the gap between the surrounding brick layer 6 and the ring working liner 3 (the masonry space is reasonable). The width of the outer arc side 15 of the surrounding brick layer 6 is greater than the width of the inner arc side 16, which facilitates the tight fit between the bricks. The outer arc side 15 of the surrounding brick layer 6 is joined to the top plane of the casting base liner 7. Expansion sand is filled between the outer arc side 15 of the surrounding brick layer 6 and the top section of the casting base liner 7, so that the surrounding brick cannot move towards its own outer arc side and is positioned, ensuring the tightness and safety of the surrounding brick ring masonry.

[0039] The top surface of the brick layer 6 is not directly opposite the brick joint of the ring working liner 3, and the brick layer 6 can block the brick joint of 5 layers of ring working liners 3 in the vertical direction, so that when the ladle is put into use, the molten steel falling into the ladle will not directly wash the brick joint of the shaped brick of the ring working liner, and prevent the molten steel from drilling into the steel or the residual thickness from not meeting the life requirements of the ring working liner.

[0040] like Figure 4 As shown, the area around the top of the nozzle seat brick 4 is lower than the upper surface of the casting lining 7, forming a recessed area 61. The portion of the upper surface of the casting lining 7 that is higher than the area around the top of the nozzle seat brick 4 forms a raised platform area 63. An inclined annular transition area 62, which serves as a connection between the raised platform area 63 and the recessed area 61, is formed. The height difference between the raised platform area 63 and the recessed area 61 is 8 cm, the thickness of the recessed area 61 is 30 cm, the height difference between the raised platform area 63 and the top of the surrounding brick layer 6 is 3 cm, and the lower boundary of the inclined annular transition area 62 is 12 cm from its upper boundary. The setting of the raised platform area, the transition area, and the recessed area is conducive to the priority flow of qualified molten steel into the nozzle and out of the ladle for full utilization, reducing excess steel and improving the molten steel yield.

[0041] The high platform area 63, the transition area 62 and the low concave area 61 form a stepped outer edge of the top of the sprue seat brick due to the height difference; the low concave area 61 is triangular fan-shaped and its area accounts for 1 / 4 of the total area of ​​the ladle.

[0042] The nozzle seat brick 4 includes an upper seat brick 42 located at its upper part and a lower seat brick 41 located at its lower part. The upper seat brick 42 has a funnel-shaped molten steel channel inside, and the lower seat brick 41 has a trapezoidal molten steel channel inside. The bottom of the funnel-shaped molten steel channel is connected to the top of the trapezoidal molten steel channel. The combination of the funnel-shaped molten steel channel and the trapezoidal molten steel channel forms a molten steel channel that can gradually change the molten steel flow rate to reduce the risk of swirling.

[0043] The inner and outer ring sides of the brick layer 6 are each provided with 1 to 3 embedded functional grooves. The outer ring side of the embedded functional grooves is embedded in the casting lining 7 and the casting interlayer 8. The contact surfaces of the casting lining 7 and the casting interlayer 8 with the inner and outer ring sides of the brick layer 6 are provided with structures that match the shape of the embedded functional grooves, so that the brick layer 6, the casting lining 7, and the casting interlayer 8 are embedded and connected to form a whole. This ensures that individual components do not slip off while dividing the mating surface into several tortuous segments, and also prevents molten steel from seeping into the gaps between the brick layer, the casting lining, and the casting interlayer. The height of the lowest embedded functional groove on one end of the inner arc side 16 of the brick layer 6 is lower than the height of the lowest embedded functional groove on one end of the outer arc side 15 of the brick layer 6, to ensure the safety of the casting lining, the casting interlayer, and the brick layer, and to improve the application safety factor of the ladle bottom, ensuring steelmaking safety and extending the service life of the casting lining, the casting interlayer, and the brick layer. Figure 3 As shown, the embedded functional groove is a raised groove 17 and / or a recessed groove 18. The inner and outer ring sides of the casting substrate 7 and the casting interlayer 8 are provided with raised grooves 17 and / or recessed grooves 18 that match the shape of the embedded functional groove. The top of the brick layer 6 is at least 3 cm higher than the casting substrate 7.

[0044] The surrounding brick layer 6 is made of aluminum-magnesium-carbon bricks, the ring working lining 3 is made of low-carbon magnesium-carbon bricks, the top of the ring working lining 3 is provided with a tank rim brick 13, and the top of the tank rim brick 13 is provided with a pouring layer 14.

[0045] Example 2

[0046] like Figure 2 As shown, a steel ladle casting bottom structure includes: a bottom permanent lining 1, a slag line brick A2, a slag line brick B12, an annular working lining 3, a nozzle seat brick 4, a permeable brick 5, a surrounding brick layer 6, a casting bottom lining 7, a casting interlayer 8, and an annular wall permanent lining 11.

[0047] The bottom permanent lining 1 is located at the bottom of the ladle; the slag line brick B12 is located below the slag line brick A2, and the lateral length of the slag line brick B12 exceeds the lateral length of the slag line brick A2 by 1cm to 5cm. The lateral length of the slag line brick A2 exceeds the bottom length of the ring working lining 3 by 5cm to 12cm, leaving reasonable space for the surrounding bricks; the outer edges of the slag line brick A2 and the slag line brick B12 are provided with a ring wall permanent lining 11 with a thickness of 6cm, and the ring wall permanent lining 11 is located at the outermost edge of the top of the bottom permanent lining 1; the slag line brick A2 is 8cm higher than the top of the center part of the bottom permanent lining 1, the slag line brick B2 is 12cm higher than the top of the slag line brick A2, and the total height of the slag line brick A2 and the slag line brick B2 is 20cm.

[0048] The top of the central part of the permanent liner 1 is provided with a casting liner 7 with a thickness of 35cm. The sprue seat brick 4 and the permeable brick 5 are embedded in the casting liner 7 and the permanent liner 1 from top to bottom. The sprue seat brick 4 and the permeable brick 5 are separated by a composite layer of the casting liner 7 and the permanent liner 1.

[0049] A surrounding brick layer 6 is built on the top plane of one side of the slag line brick B12, and a ring working liner 3 is built on the top plane of one side of the slag line brick A2. There is a 5cm gap between the surrounding brick layer 6 and the ring working liner 3. A casting interlayer 8 is set in the gap between the surrounding brick layer 6 and the ring working liner 3 (the masonry space is reasonable). The bottom shape of the casting interlayer 8 matches the shape of the inward side of the slag line brick B12 and the slag line brick A2 and stands on the inward side of the slag line brick B12 and the slag line brick A2. The width of the outer arc side 15 of the surrounding brick layer 6 is greater than the width of the inner arc side 16, which facilitates the tight fit between the bricks. The outer arc side 15 of the surrounding brick layer 6 is higher than the top plane of the casting underlay 7 by a certain height. The inner arc side of the surrounding brick layer 6 is flush with the top plane of the casting interlayer 8.

[0050] The top surface of the brick layer 6 is not directly opposite the brick joint of the ring working liner 3, and the brick layer 6 can block the brick joint of 5 layers of ring working liners 3 in the vertical direction, so that when the ladle is put into use, the molten steel falling into the ladle will not directly wash the brick joint of the shaped brick of the ring working liner, and prevent the molten steel from drilling into the steel or the residual thickness from not meeting the life requirements of the ring working liner.

[0051] The area around the top of the sprue seat brick 4 is lower than the upper surface of the casting lining 7, forming a recessed area 61. The portion of the upper surface of the casting lining 7 that is higher than the area around the top of the sprue seat brick 4 forms a raised platform area 63. An inclined annular transition area 62 connects the raised platform area 63 and the recessed area 61. The height difference between the raised platform area 63 and the recessed area 61 is 8 cm, the thickness of the recessed area 61 is 30 cm, the height difference between the raised platform area 63 and the top of the surrounding brick layer 6 is 3 cm, and the lower boundary of the inclined annular transition area 62 is 12 cm from its upper boundary. The arrangement of the raised platform area, transition area, and recessed area is conducive to achieving qualified castings. Molten steel is prioritized to flow into the nozzle and out of the ladle as much as possible for full utilization, reducing excess steel and improving steel yield; the concave area 61 is triangular fan-shaped, and its area accounts for 1 / 4 of the total ladle area; the nozzle seat brick 4 includes an upper seat brick 42 located above it and a lower seat brick 41 located below it. The upper seat brick 42 has a funnel-shaped molten steel channel inside, and the lower seat brick 41 has a trapezoidal molten steel channel inside. The bottom of the funnel-shaped molten steel channel is connected to the top of the trapezoidal molten steel channel. The combination of the funnel-shaped molten steel channel and the trapezoidal molten steel channel forms a molten steel channel that can gradually change the molten steel flow rate to reduce the risk of swirling;

[0052] The outer edge of the top of the water inlet seat brick is stepped due to the height difference between the high platform area 63, the transition area 62 and the low concave area 61;

[0053] The inner and outer ring sides of the brick layer 6 are provided with 1 to 3 embedded functional grooves. The outer ring side of the embedded functional grooves is embedded in the casting lining 7 and the casting interlayer 8. The contact surfaces of the casting lining 7 and the casting interlayer 8 with the inner and outer ring sides of the brick layer 6 are provided with structures that match the shape of the embedded functional grooves, so that the brick layer 6, the casting lining 7 and the casting interlayer 8 are embedded and connected to form a whole. This ensures that individual components do not slip off while dividing the mating surface into several curved segments, and also prevents molten steel from seeping into the gaps between the brick layer, the casting lining and the casting interlayer. The inner arc side 16 of the brick layer 6 is located at the bottom. The height of the embedded functional groove is lower than the height of the lowest embedded functional groove on one side of the outer arc side 15 of the surrounding brick layer 6, so as to ensure the safety of the casting lining, casting interlayer and surrounding brick layer, and improve the application safety factor of the bottom of the ladle, ensure steelmaking safety, and improve the service life of the casting lining, casting interlayer and surrounding brick; the embedded functional groove is a protrusion 17 and / or a groove 18, and the inner and outer ring sides of the casting lining 7 and casting interlayer 8 are provided with protrusions 17 and / or grooves 18 that match the shape of the embedded functional groove on the contact surfaces with the inner and outer ring sides of the surrounding brick layer 6; the top of the surrounding brick layer 6 is at least 3cm higher than the casting lining 7;

[0054] The surrounding brick layer 6 is made of corundum carbon brick, and the ring working lining 3 is made of low carbon magnesia carbon brick; the top of the ring working lining 3 is provided with a rim brick 13, and the top of the rim brick 13 is provided with a pouring layer 14.

[0055] The brick layer 6 can only be laid after the bottom permanent lining 1 and the ring wall permanent lining 11 have been formed, and after the ring working lining 3 has been built or more than 5 layers of ring working lining 3 have been built. The bottom lining 7 and the cast-in-place layer 8 can be cast at the same time, and refractory materials with different properties can be used as castables to meet the combination of performance and cost.

Claims

1. A ladle bottom structure for steel ladle casting, characterized in that, include: The permanent lining (1), at least one layer of slag line bricks, ring working lining (3), nozzle seat bricks (4), permeable bricks (5), surrounding brick layer (6), cast-in-place lining (7), cast-in-place interlayer (8), and ring wall permanent lining (11). The bottom permanent liner (1) is located at the bottom of the ladle; the top of the outer edge of the bottom permanent liner (1) is at least one layer of slag line brick; the transverse length of the slag line brick is 6 cm to 17 cm longer than the transverse length of the ring working liner (3); the outer edge of the slag line brick is provided with a ring wall permanent liner (11), which is located at the outermost edge of the top of the bottom permanent liner (1). The top of the central part of the permanent lining (1) is provided with a castable lining (7). The sprue seat brick (4) and the permeable brick (5) are embedded in the castable lining (7) and the permanent lining (1) from top to bottom. The sprue seat brick (4) and the permeable brick (5) are separated by a composite layer of the castable lining (7) and the permanent lining (1). When the slag line brick is only one layer: a surrounding brick layer (6) is built on the top plane of one side of the slag line brick, and a ring working lining (3) is built on the top plane of the other side of the slag line brick. There is a certain gap between the surrounding brick layer (6) and the ring working lining (3). A casting interlayer (8) is set in the gap between the surrounding brick layer (6) and the ring working lining (3). The width of the outer arc side (15) of the surrounding brick layer (6) is greater than the width of the inner arc side (16). The outer arc side (15) of the surrounding brick layer (6) is joined to the top plane of the casting lining (7). Expansion sand is filled between the outer arc side (15) of the surrounding brick layer (6) and the top section of the casting lining (7). When the slag line bricks are multi-layered: a surrounding brick layer (6) is built on the top plane of one side of the bottom slag line brick, and a ring working liner (3) is built on the top plane of one side of the top slag line brick. There is a certain gap between the surrounding brick layer (6) and the ring working liner (3). A casting interlayer (8) is set in the gap between the surrounding brick layer (6) and the ring working liner (3). The bottom shape of the casting interlayer (8) matches the shape of the inward side of the bottom slag line brick and the top slag line brick and stands on the part from the bottom slag line brick to the inward side of the top slag line brick. The width of the outer arc side (15) of the surrounding brick layer (6) is greater than the width of the inner arc side (16). The outer arc side (15) of the surrounding brick layer (6) is higher than the top plane of the casting liner (7) by a certain height. The inner arc side of the surrounding brick layer (6) is flush with the top plane of the casting interlayer (8). The top surface of the surrounding brick layer (6) is not directly opposite the brick joint of the ring working liner (3), and the surrounding brick layer (6) can block the brick joint of 1 to 5 layers of ring working liner (3) in the vertical direction.

2. The ladle bottom structure for steel ladle casting according to claim 1, characterized in that: The slag line bricks consist of two layers: slag line brick A (2) and slag line brick B (12). Slag line brick B (12) is located below slag line brick A (2). The lateral length of slag line brick B (12) exceeds the lateral length of slag line brick A (2) by 1 cm to 5 cm. The lateral length of slag line brick A (2) exceeds the bottom length of the ring working liner (3) by 5 cm to 12 cm.

3. The ladle bottom structure according to claim 1, characterized in that: The area around the top of the sprue seat brick (4) is lower than the upper surface of the casting lining (7) to form a low-lying area (61). The part of the upper surface of the casting lining (7) that is higher than the area around the top of the sprue seat brick (4) forms a high platform area (63). An inclined annular surface transition area (62) is formed between the high platform area (63) and the low-lying area (61) to serve as a connection. The outer edge of the top of the water inlet seat brick is formed by the height difference between the high platform area (63), the transition area (62) and the low concave area (61).

4. The ladle bottom structure according to claim 3, characterized in that: The concave area (61) is triangular fan-shaped, and its area accounts for 1 / 4 of the total area of ​​the ladle.

5. The ladle bottom structure according to claim 1, characterized in that: The water inlet seat brick (4) includes an upper seat brick (42) located above it and a lower seat brick (41) located below it. The upper seat brick (42) has a funnel-shaped steel water channel inside, and the lower seat brick (41) has a trapezoidal steel water channel inside.

6. The ladle bottom structure according to claim 1, characterized in that: The inner and outer ring sides of the brick layer (6) are provided with 1 to 3 embedded functional grooves. The outer ring side of the embedded functional groove is embedded in the casting lining (7) and the casting interlayer (8). The inner and outer ring sides of the casting lining (7) and the casting interlayer (8) are provided with structures that match the shape of the embedded functional grooves on the contact surfaces with the inner and outer ring sides of the brick layer (6), so that the brick layer (6), the casting lining (7) and the casting interlayer (8) are embedded and connected to form a whole. The height of the embedded functional groove at the bottom of the inner arc side (16) of the brick layer (6) is lower than the height of the embedded functional groove at the bottom of the outer arc side (15) of the brick layer (6).

7. The ladle bottom structure according to claim 6, characterized in that: The embedded functional groove is a raised groove (17) and / or a recessed groove (18). The inner and outer ring sides of the casting lining (7) and casting interlayer (8) are provided with raised grooves (17) and / or recessed grooves (18) that match the shape of the embedded functional groove.

8. The ladle bottom structure according to claim 1, characterized in that: The surrounding brick layer (6) is made of aluminum magnesium carbon brick, corundum carbon brick or corundum spinel precast brick, and the ring working lining (3) is made of low carbon magnesium carbon brick.

9. The ladle bottom structure according to claim 1, characterized in that: The top of the ring working liner (3) is provided with a tank rim brick (13), and the top of the tank rim brick (13) is provided with a rim pouring layer (14).

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