Novel hot-metal ladle masonry structure

Abstract

The utility model relates to a novel hot-metal ladle masonry structure which comprises a ladle bottom masonry structure and a ladle wall masonry structure, the ladle wall masonry structure is arranged along the periphery of at least one part of the ladle bottom masonry structure, and the ladle bottom masonry structure comprises a first permanent layer, a brick masonry layer and a first working layer which are sequentially arranged from bottom to top. The tank wall masonry structure comprises a second permanent layer and a second working layer arranged on the inner side of the second permanent layer. The brick building layer comprises a flat building layer and a side building layer which are sequentially arranged from bottom to top. The second permanent layer comprises a first vertical building layer and a second vertical building layer located on the inner side of the first vertical building layer, and the second vertical building layer is located on the outer side of the second working layer. And the second working layer is formed by pouring castable through a mold and is in contact with the first working layer. The tank wall masonry structure adopts integral pouring of the tank wall, and the tank bottom masonry structure adopts the combination of castable and bricking to reduce the temperature reduction of molten iron and ensure the anti-scouring strength of the tank bottom.

Description

Technical Field

[0001] The utility model relates to the technical field of steelmaking, in particular to a novel molten iron tank masonry structure. Background Art

[0002] The "one-tank" molten iron supply process is a new iron-steel interface technology that has emerged in recent years. This technology eliminates the intermediate process of pouring iron from traditional torpedo tank cars or blast furnace molten iron tanks, and directly uses molten iron tanks to integrate the functions of blast furnace molten iron reception, transportation, buffer storage, molten iron pretreatment, and converter iron addition, which places higher requirements on the masonry process structure of the molten iron tank.

[0003] The traditional brick-built ladle structure cools down quickly, has serious sticking, increases tare weight, uneven ladle loading, and low direct exchange rate, which affects the smooth flow of steel production logistics. In addition, the bottom of the ladle is severely scoured during the iron-tapping process, and the bottom of the ladle cannot be completely replaced by castables.

[0004] Patent document CN 218555551 U discloses a masonry structure of a molten iron tank, wherein a protective lining is fixedly provided on the surface of the tank bottom, a first refractory brick layer is built on the surface of the protective lining, and a permanent lining is fixedly provided on the surface of the first refractory brick layer; a castable layer is fixedly provided on the side wall of the tube wall, a third refractory brick layer is built on the side wall of the castable layer, a curing layer is provided on the side wall of the third refractory brick layer, and a second refractory brick layer is built on the surface of the first refractory brick layer. The disclosed masonry structure enhances the strength of the entire molten steel tank by the masonry of high-aluminum refractory bricks and the coordination between the masonry structure layers, but the third refractory brick layer of the tube wall is a single-layer high-aluminum refractory brick, and does not have the effective heat insulation effect of the first refractory brick layer and the second refractory brick layer of the tank bottom on high-temperature molten iron.

[0005] Based on this, there is room for improvement in the thermal insulation of the iron ladle masonry structure. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a new type of molten iron tank masonry structure to solve the technical problem of fast cooling of the traditional brick-built molten iron tank structure.

[0007] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0008] A novel iron molten ladle masonry structure, comprising:

[0009] The tank bottom masonry structure includes a first permanent layer, a brickwork layer and a first working layer arranged in sequence from bottom to top;

[0010] A tank wall masonry structure, the tank wall masonry structure is arranged along the periphery of at least a portion of the tank bottom masonry structure, and the tank wall masonry structure includes a second permanent layer and a second working layer arranged inside the second permanent layer;

[0011] The bricklaying layer includes a horizontally laid layer and a side-laid layer arranged in sequence from bottom to top. The horizontally laid layer is arranged above the first permanent layer, and the side-laid layer is located below the first working layer;

[0012] The second permanent layer includes a first vertically laid layer and a second vertically laid layer inside the first vertically laid layer. The second vertically laid layer is located outside the second working layer;

[0013] The second working layer is cast with a castable by means of a mold and is in contact with the first working layer.

[0014] In some embodiments, the first permanent layer is cast with a castable.

[0015] In some embodiments, the first working layer is cast with a castable, and the thickness of the first working layer is positioned at 290 mm - 310 mm.

[0016] In some embodiments, the horizontally laid layer is the bottom bricks of the ladle arranged horizontally above the first permanent layer, and the side-laid layer is the bottom bricks of the ladle arranged sidewise above the horizontally laid layer.

[0017] In some embodiments, both the first vertically laid layer and the second vertically laid layer are erected with T3 - 1 / 2 high-alumina bricks along the periphery of the bricklaying layer above the bricklaying layer.

[0018] In some embodiments, the second working layer is cast in one go with a castable by means of an integral casting mold, and the thickness of the second working layer is positioned at 220 mm - 240 mm.

[0019] In some embodiments, the novel ladle masonry structure further includes a ladle rim, and the ladle rim is arranged above the ladle wall masonry structure.

[0020] In some embodiments, the ladle rim is cast with a castable.

[0021] In some embodiments, the first permanent layer includes steel bars, and the steel bars are uniformly arranged in the first permanent layer.

[0022] In some embodiments, the steel bars are "V"-shaped steel bars with a diameter of 10 mm.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The novel ladle masonry structure of the present utility model adopts a combination of castable and bricklaying to ensure the erosion resistance strength at the bottom. The ladle wall masonry structure adopts an integral casting method, reducing the temperature drop of the molten iron, effectively controlling the tare weight of the ladle, ensuring the charging capacity, saving the masonry time, reducing the repair cost of the ladle, stabilizing the imbalance of the ladle charging capacity, and ensuring the smooth flow of the steelmaking production logistics. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the novel ladle lining structure provided by an embodiment of the present invention.

[0027] In the figure: 1. The first permanent layer; 2. The bricklaying layer; 3. The first working layer; 4. The second permanent layer; 5. The second working layer; 6. The horizontal laying layer; 7. The side laying layer; 8. The first vertical laying layer; 9. The second vertical laying layer; 10. The ladle rim. Specific embodiments

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear and understandable, the following will further describe the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0029] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are used to distinguish two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be understood as a limitation to the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.

[0030] As Figure 1 shown, the novel ladle lining structure of the present invention includes a ladle bottom lining structure and a ladle wall lining structure. Among them, the ladle wall lining structure is arranged along the periphery of at least a part of the ladle bottom lining structure. The ladle bottom lining structure includes the first permanent layer 1, the bricklaying layer 2, and the first working layer 3 arranged in sequence from bottom to top. The ladle wall lining structure includes the second permanent layer 4 and the second working layer 5 arranged inside the second permanent layer 4. The end of the first working layer 3 close to the second permanent layer 4 contacts the bottom of the second working layer 5. The second working layer 5 is cast with castable by using a mold. During the casting process, it is cast in one go, vibrated sufficiently, and there should be no voids and bubbles in the castable. And after the casting is completed, it is cured until the second working layer 5 has the third set strength before the mold can be removed. Casting in one go can ensure the overall strength of the second working layer 5.

[0031] Compared with the prior art, the novel ladle lining structure of the present invention uses a combination of castable and bricklaying to prevent the serious erosion of the bottom of the ladle during the tapping process. The ladle wall lining structure uses bricklaying and integral pouring to reduce the temperature drop of the molten iron, solving the technical problem of the fast temperature drop of the traditional brick-lined ladle structure.

[0032] In some embodiments, the first permanent layer 1 of the tank bottom masonry structure is formed by casting refractory castable. During the casting process, the refractory castable is leveled and compacted, and cured for a certain period of time after the casting is completed. Thereby ensuring the integrity and required strength of the first permanent layer 1.

[0033] In some embodiments, the first permanent layer 1 is formed by casting the hot metal ladle refractory castable. During the casting process, the hot metal ladle refractory castable is promptly leveled and compacted with a vibrating rod, and cured until the first permanent layer 1 has a first set strength after the casting is completed.

[0034] In some embodiments, the first permanent layer 1 includes steel bars, which are uniformly arranged in the first permanent layer 1. The steel bars can be "V"-shaped steel bars with a diameter of 10 mm. Therefore, the durability of the first permanent layer 1 can be ensured.

[0035] In some embodiments, the first permanent layer 1 can be in the shape of an inverted truncated cone. The height of the steel bars at the center of the first permanent layer 1 is 100 mm, and the height of the steel bars near the tank wall masonry structure at the periphery of the first permanent layer 1 is 50 mm. The steel bars are uniformly arranged in the first permanent layer 1.

[0036] In some embodiments, the first permanent layer 1 can be in the shape of a cylinder. The steel bars are uniformly arranged in the first permanent layer 1, and the height of the steel bars is 100 mm.

[0037] In some embodiments, the brick layer 2 of the tank bottom masonry structure adopts a mixed masonry method combining flat laying and side laying, with the brick joints staggered, horizontal and vertical. The brick layer 2 includes a flat laying layer 6 and a side laying layer 7 arranged in sequence from bottom to top. The flat laying layer 6 is arranged above the first permanent layer 1, and the side laying layer 7 is arranged above the flat laying layer 6 and below the first working layer 3. The brick layer 2 ensures the erosion resistance strength of the tank bottom masonry structure. The brick layer 2 can also be called the "signal brick". During the use of the new hot metal ladle masonry structure, if the first working layer 3 is eroded too deeply and the brick layer 2 is exposed, the ladle must be stopped for repair.

[0038] In some embodiments, the flat laying layer 6 is formed by laying the tank bottom bricks in a flat laying manner above the first permanent layer 1, and the side laying layer 7 is formed by laying the tank bottom bricks in a side laying manner above the flat laying layer 6. The brick joints of the flat laying layer 6 and the side laying layer 7 are staggered, horizontal and vertical.

[0039] In some embodiments, the first working layer 3 of the tank bottom masonry structure is formed by casting refractory castable. During the casting process, the refractory castable is leveled and compacted, and cured for a certain period of time after the casting is completed. Thereby ensuring the integrity and required strength of the first working layer 3.

[0040] In some embodiments, the first working layer 3 is cast by a hot metal ladle castable. During the casting process, a vibrating rod is used to level and compact the hot metal ladle castable in a timely manner, and after the casting is completed, it is cured until the first working layer 3 has a second set strength. The thickness of the first working layer 3 can be set to 290 mm - 310 mm to ensure the service life of the hot metal ladle.

[0041] In some embodiments, the second permanent layer 4 of the ladle wall masonry structure includes a first vertically laid layer 8 and a second vertically laid layer 9 located inside the first vertically laid layer 8. The second vertically laid layer 9 is located outside the second working layer 5. Both the first vertically laid layer 8 and the second vertically laid layer 9 are vertically laid along the perimeter of the bricklaying layer 2 above the bricklaying layer 2 using T3-1 / 2 high alumina bricks. When laying the first vertically laid layer 8 and the second vertically laid layer 9, fire clay is applied to each T3-1 / 2 high alumina brick and the joints are made full and tight. The brick joints of adjacent T3-1 / 2 high alumina bricks in the first vertically laid layer 8 and the second vertically laid layer 9 are staggered tightly, with the brick joint ≤ 1 mm. Therefore, the strength of the second permanent layer 4 is ensured.

[0042] In some embodiments, the second working layer 5 is cast in one go by a monolithic casting mold for the castable. During the casting process, once the casting is completed, it is vibrated sufficiently. When using the vibrating rod, it should be "fast in and slow out", and the dragging should be slow and uniform. There should be no voids and bubbles in the castable, and after the casting is completed, it is cured until the second working layer 5 has a third set strength before the monolithic casting mold can be removed. The thickness of the second working layer 5 is set to 220 mm - 240 mm. The bottom of the cast second working layer 5 contacts the end of the first working layer 3 close to the second permanent layer 4.

[0043] In some embodiments, the first working layer 3 and the second working layer 5 can be cast integrally. After the first permanent layer 1 is cast and the flat laying layer 6 and the side laying layer 7 are set up, the first vertically laid layer 8 and the second vertically laid layer 9 are sequentially set up from the outside to the inside above the perimeter of the side laying layer 7. The second working layer 5 and the first working layer 3 can be cast integrally inside the second vertically laid layer 9 and above the side laying layer 7.

[0044] In some embodiments, the new hot metal ladle masonry structure further includes a ladle rim 10. The ladle rim 10 is set above the ladle wall masonry structure and is cast by a castable.

[0045] In some embodiments, the first permanent layer 1, the first working layer 3, the second working layer 5, and the ladle rim 10 can be cast using the same castable. For example, the castable can all be a hot metal ladle castable, and the physical and chemical indexes are: alumina (Al 2 O 3)≥73%, refractoriness ≥1720 °C, compressive strength (110 °C × 24 h) ≥20 MPa, compressive strength (1350 °C × 3 h) ≥40 MPa, permanent linear change rate (1350 °C × 3 h): 0 - 0.6%.

[0046] In some embodiments, the new ladle lining structure is arranged inside the ladle shell (not shown) and serves as the ladle shell's inner lining.

[0047] The preparation of the new ladle lining structure of the present utility model includes:

[0048] 1. Prepare the first permanent layer 1

[0049] Weld the tie bars with "V" - shaped steel bars with a diameter of 10 mm at the bottom of the ladle shell. The height of the steel bars at the center of the ladle shell bottom is 100 mm, and the height of the steel bars at the periphery of the ladle shell bottom is 50 mm;

[0050] Pour with ladle casting material, and use a vibrating rod to level and compact the ladle casting material in time. After pouring is completed, cure until the first permanent layer 1 has the first set strength.

[0051] 2. Prepare the brick - laid layer 2

[0052] Level the upper surface of the first permanent layer 1, and pave the concave parts with wet aluminous - magnesia fire clay. Adopt the flat - laying masonry method to lay a layer of ladle bottom bricks above the upper surface of the first permanent layer 1 to form the flat - laid layer 6, and then adopt the side - laying masonry method to lay a layer of ladle bottom bricks above the upper surface of the flat - laid layer 6 to form the side - laid layer 7. The brick joints of the flat - laid layer 6 and the side - laid layer 7 are staggered, horizontal and vertical. Wedge the triangular joints at the joint between the ladle shell and above the periphery of the first permanent layer 1 with cut bricks and broken bricks, and pour aluminous - magnesia fire clay or ladle casting material.

[0053] 3. Prepare the second permanent layer 4

[0054] Adopt T3 - 1 / 2 high - alumina bricks to vertically lay the first vertically - laid layer 8 and the second vertically - laid layer 9 in sequence from outside to inside above the side - laid layer 7 along the periphery of the side - laid layer 7. Each T3 - 1 / 2 high - alumina brick should be smeared with fire clay and the joints should be filled with mortar tightly. The brick joints between adjacent T3 - 1 / 2 high - alumina bricks of the first vertically - laid layer 8 and the second vertically - laid layer 9 are staggered tightly, and the brick joints ≤1 mm.

[0055] 4. Prepare the first working layer 3

[0056] Pour with ladle casting material above the side - laid layer 7, and use a vibrating rod to level and compact the ladle casting material in time. After pouring is completed, cure until the first working layer 3 has the second set strength. The thickness of the first working layer 3 is positioned at 300 mm.

[0057] 5. Prepare the second working layer 5

[0058] Adopt the overall casting method. After the integral casting mold is placed inside the second permanent layer 4 and at the center position of the ladle shell, welding plates are welded around the ladle wall between the upper part of the integral casting mold and the ladle shell to prevent displacement during the casting process. During the casting process, the ladle casting material is used to complete the casting at one time, with sufficient vibration. When operating the vibrating rod, it should be "fast in and slow out", and the dragging should be slow and uniform. There should be no voids and bubbles in the casting material. And after the casting is completed, it is cured until the second working layer 5 reaches the third set strength before the integral casting mold can be removed. The thickness of the second working layer 5 is positioned at 230 mm.

[0059] When casting the second working layer 5, a segmented mold is not used because the casting times at the joints of the segmented molds are inconsistent, and faults are likely to occur at the joints.

[0060] In another embodiment, the preparation of the novel ladle masonry structure of the present utility model is similar to the above preparation method. First, the first permanent layer 1, the brick layer 2, and the second permanent layer 4 are prepared in sequence, and then the integral casting mold is used to prepare the first working layer 3 and the second working layer 5 at one time. When preparing the first working layer 3 and the second working layer 5, after the integral casting mold is placed inside the second permanent layer 4 and at the center position of the ladle shell, welding plates are welded around the ladle wall between the upper part of the integral casting mold and the ladle shell to prevent displacement during the casting process. During the casting process, the ladle casting material is used to complete the casting at one time, with sufficient vibration. When the first working layer 3 is first formed, the ladle casting material is leveled and compacted in time with a vibrating rod. Subsequently, when forming the second working layer 5, the vibrating rod should be "fast in and slow out", and the dragging should be slow and uniform. There should be no voids and bubbles in the casting material. After the casting is completed, it is cured for a period of time so that the first working layer 3 and the second working layer 5 have corresponding strengths. In this preparation method, the first working layer 3 and the second working layer 5 form an integral structure.

[0061] The novel ladle masonry structure of the present utility model, under the premise of the "one-pot" process of the ladle, adopts the combination of casting material and bricklaying to ensure the anti-scouring strength at the bottom. The ladle wall masonry structure adopts the overall casting method, reducing the temperature drop of the molten iron, effectively controlling the tare weight of the ladle, ensuring the charging capacity, saving the masonry time, reducing the repair cost of the ladle, stabilizing the imbalance of the ladle charging capacity, and ensuring the smooth flow of the steelmaking production logistics. The novel ladle masonry structure of the present utility model has high practical and promotional value, and its preparation method is simple, economical, and effective, with universality, and can be widely applied in iron and steel enterprises.

[0062] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0063] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A new type of iron molten ladle masonry structure, characterized in that: include: A tank bottom masonry structure, the tank bottom masonry structure comprising a first permanent layer (1), a brickwork layer (2) and a first working layer (3) arranged in sequence from bottom to top; A tank wall masonry structure, the tank wall masonry structure being arranged along the periphery of at least a portion of the tank bottom masonry structure, the tank wall masonry structure comprising a second permanent layer (4) and a second working layer (5) arranged inside the second permanent layer (4); The brickwork layer (2) comprises a flat masonry layer (6) and a side masonry layer (7) which are arranged in sequence from bottom to top, wherein the flat masonry layer (6) is arranged above the first permanent layer (1), and the side masonry layer (7) is located below the first working layer (3); The second permanent layer (4) comprises a first vertical masonry layer (8) and a second vertical masonry layer (9) located inside the first vertical masonry layer (8), and the second vertical masonry layer (9) is located outside the second working layer (5); The second working layer (5) is cast by using a casting material through a mold and is in contact with the first working layer (3).

2. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The first permanent layer (1) is formed by casting a casting material.

3. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The first working layer (3) is cast by casting material, and the thickness of the first working layer (3) is set at 290 mm-310 mm.

4. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The flat masonry layer (6) is a tank bottom brick arranged on top of the first permanent layer (1) in a flat masonry manner, and the side masonry layer (7) is a tank bottom brick arranged on top of the flat masonry layer (6) in a side masonry manner.

5. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The first vertical masonry layer (8) and the second vertical masonry layer (9) are both made of T3-1 / 2 high-alumina bricks and are vertically laid along the periphery of the brickwork layer (2) above the brickwork layer (2).

6. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The second working layer (5) is formed by pouring the casting material at one time through an integral casting mold, and the thickness of the second working layer (5) is positioned at 220 mm-240 mm.

7. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The novel molten iron ladle masonry structure further comprises a ladle edge (10), wherein the ladle edge (10) is arranged above the ladle wall masonry structure.

8. The novel iron molten ladle masonry structure according to claim 7 is characterized in that: The tank rim (10) is formed by casting a casting material.

9. The novel iron molten ladle masonry structure according to claim 1 is characterized in that: The first permanent layer (1) comprises steel bars, which are evenly arranged in the first permanent layer (1).

10. The novel iron molten ladle masonry structure according to claim 9 is characterized in that: The steel bars are "V" shaped steel bars with a diameter of 10 mm.

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