A new refractory lining structure for ladle

Abstract

The utility model proposes a novel refractory lining structure of a ladle, which is characterized by comprising a working layer directly in contact with the molten iron, the working layer comprising bottom bricks and wall bricks respectively laid on the bottom and wall areas of the ladle, and a slag line area in contact with the surface of the molten iron is provided in the wall brick area; the utility model has a reasonable design structure and is convenient to use, and a bottom center prefabricated block is arranged in the center of the bottom working layer and a bottom circumferential prefabricated block is arranged around to replace the existing refractory brick laying method, which can increase the wear resistance and impact resistance of the two areas and extend their service life on the one hand, and can quickly repair the structures at the two places by adopting the prefabricated block method, thus saving maintenance time; the marking block with a multi-step stepped structure can facilitate operators to identify the erosion depth of the bottom center area, so that the bottom bricks or the bottom center prefabricated blocks can be replaced at the first time, which is safer and more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of molten iron ladles, and in particular relates to a novel refractory lining structure of a molten iron ladle. Background Art

[0002] The ladle is an important equipment used for casting in the foundry. It receives the molten iron in front of the furnace and then transports it to the mold for casting by a crane. The ladle plays a vital role in the steel industry and is an indispensable part of the production process. It is not only used to load molten iron, but also has multiple functions such as receiving, transporting, buffering, pre-treating, adding iron to the converter, and keeping the molten iron warm in the modern steel production process. The use of the ladle is of great significance to improving steelmaking efficiency and ensuring the quality of molten steel.

[0003] At present, the lining structure of the ladle is a key factor affecting the service life and production safety of the ladle. The existing ladle lining generally includes an insulation layer, a permanent layer and a working layer. Among them, since the working layer is in direct contact with the molten iron, it needs to have high fire resistance and high temperature resistance. However, the existing ladle lining structure usually adopts an integral masonry method, that is, the bottom bricks and the wall bricks are built with the same brick type, which will lead to greater damage problems in the center area of ​​the bottom, the slag line area, and the junction area between the bottom and the wall. While affecting the service life of the ladle, it also brings certain difficulties to the subsequent repair work. In addition, since the bottom brick area is severely eroded, the staff cannot accurately judge the erosion depth of the bottom bricks based on visual inspection, resulting in the bottom bricks cannot be fully utilized or the bottom bricks are severely eroded, causing safety accidents. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a novel refractory lining structure of a molten iron ladle, in which a central prefabricated block of the bottom is arranged at the center of the ladle bottom working layer, and a circumferential prefabricated block of the bottom is arranged around the ladle to replace the existing refractory brick masonry method. On the one hand, the wear resistance and impact resistance of the two areas can be increased and their service life can be extended. On the other hand, the prefabricated blocks can be used to quickly repair the structures at the two locations, saving maintenance time. The marking blocks with a multi-step structure can facilitate operators to identify the erosion depth of the central area of ​​the bottom of the ladle, so that the bottom bricks or the central prefabricated blocks of the bottom can be replaced as soon as possible, which is safer and more reliable.

[0005] The technical scheme adopted by the utility model is: a novel refractory lining structure of a molten iron ladle, including a working layer directly in contact with the molten iron, the working layer including bottom bricks and wall bricks respectively laid on the bottom and wall areas of the ladle, a slag line area in contact with the surface of the molten iron is provided in the wall brick area, a slag line area coating is provided on the inner wall of the wall brick where the slag line area is located, a bottom center prefabricated block is provided in the middle area of ​​the working layer at the bottom of the ladle, the bottom center prefabricated block is connected to the surrounding bottom bricks, and the upper surface of the bottom center prefabricated block is flush with the upper surface of the bottom bricks, a marking block is buried inside the bottom center prefabricated block, and the center of the marking block is arranged along the vertical direction and forms a multi-step structure.

[0006] The working layer also includes a ladle nozzle castable located above the iron ladle, and the lower end of the ladle nozzle castable is connected to the upper surface of the ladle wall brick.

[0007] The marking block is a three-step structure with a larger top and a smaller bottom.

[0008] The working layer also includes a plurality of bottom circumferential prefabricated blocks evenly distributed in the circumferential direction of the bottom, the upper ends of the bottom circumferential prefabricated blocks are connected to the lower ends of the wall bricks, and the other ends of the bottom circumferential prefabricated blocks are connected to the outer wall of the bottom bricks.

[0009] The outer wall of the bottom center prefabricated block is in a step-like structure, and the inner wall of the bottom brick is in a step-like structure matching the outer wall of the bottom center prefabricated block.

[0010] The invention also includes a heat-insulating layer which is arranged inside the steel shell of the molten iron ladle and is in contact with the inner wall of the steel shell. The heat-insulating layer is formed by light clay bricks, light high-alumina bricks or light silicon bricks.

[0011] The interior of the thermal insulation layer is built with a permanent layer, which is formed by high-alumina bricks, magnesia bricks or magnesia-carbon bricks.

[0012] The beneficial effects of the utility model are:

[0013] The utility model has a reasonable design structure and is easy to use. It replaces the existing refractory brick masonry method by arranging a bottom center prefabricated block in the center of the bottom working layer and arranging bottom circumferential prefabricated blocks around the bottom. On the one hand, it can increase the wear resistance and impact resistance of the two areas and extend their service life. On the other hand, the prefabricated blocks can be used to quickly repair the structures at the two locations, saving maintenance time. The marking blocks with a multi-step structure can facilitate operators to identify the erosion depth of the central area of ​​the bottom, so that the bottom bricks or the bottom center prefabricated blocks can be replaced as soon as possible, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a three-dimensional diagram of the bottom circumference prefabricated block of the utility model.

[0016] Among them: 1. Steel shell; 2. Insulation layer; 3. Permanent layer; 4. Spout castable; 5. Slag line area coating; 6. Wall bricks; 7. Bottom circumference prefabricated blocks; 8. Marking blocks; 9. Bottom center prefabricated blocks; 10. Bottom bricks. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] As shown in the figure, a new refractory lining structure of a ladle includes a working layer directly in contact with the molten iron, and the working layer includes bottom bricks 10 and wall bricks 6 respectively laid on the bottom and wall areas of the ladle, wherein the bottom bricks 10 and the wall bricks 6 can both be made of refractory bricks that can withstand extremely high temperatures and chemical corrosion, such as alumina-magnesia refractory materials (magnesia-alumina spinel bricks), magnesia-carbon bricks, chrome corundum bricks, etc.

[0019] The wall brick 6 has a slag line area in contact with the surface of the molten iron, and a slag line area coating 5 is provided on the inner wall of the wall brick 6 where the slag line area is located. In this example, the slag line area coating 5 can be made of a ceramic material of silicon carbide (SiC) to enhance the wear resistance and corrosion resistance of the slag line area.

[0020] A central prefabricated block 9 of the bottom is provided in the middle area of ​​the working layer of the bottom. The central prefabricated block 9 of the bottom is connected to the surrounding bottom bricks 10, and the upper surface of the central prefabricated block 9 of the bottom is flush with the upper surface of the bottom bricks 10. The central prefabricated block 9 of the bottom can be prefabricated with aluminum-magnesium castable or zirconium material. The main purpose is to improve the corrosion resistance of molten iron when it falls. In addition, it can be quickly replaced during replacement, saving maintenance time and shortening working hours.

[0021] A marking block 8 is buried inside the central prefabricated block 9 of the bottom of the package. The center of the marking block 8 is arranged in the vertical direction and has a multi-step stepped structure. More specifically, in this example, the marking block 8 is a three-step stepped structure with a larger top and a smaller bottom. The marking block 8 can be made of a material different from that of the central prefabricated block 9 of the bottom of the package, such as magnesium-aluminum spinel material, high-aluminum material, chrome-magnesium material, silicon carbide material, etc. The main purpose is to make it different in color from the central prefabricated block 9 of the bottom of the package, so that the operator can observe the size of the marking block 8 to judge the depth of erosion in the bottom area. Setting three steps means that the marking block 8 has three different sizes in actual observation, which has the advantage of obvious contrast effect.

[0022] The working layer also includes a ladle spout castable 4 located above the ladle, the lower end of the ladle spout castable 4 is connected to the upper surface of the ladle wall brick 6, the ladle spout castable 4 can be made of Al2O3-SiC series material, which has sufficient high temperature resistance and resistance to slag erosion, and can protect the ladle spout area when the molten iron is poured. In this example, the ladle spout castable 4 is distributed along the circumference of the inner wall of the working layer above the ladle, and the shape of the ladle spout is an outwardly inclined structure in the prior art, which is not shown in the figure. Since it belongs to a conventional structural design, the specific structure of the ladle spout will not be described in detail here.

[0023] The working layer also includes a plurality of bottom circumferential prefabricated blocks 7 uniformly distributed in the circumferential direction of the bottom, the upper end of the bottom circumferential prefabricated block 7 is connected to the lower end of the wall brick 6, and the other end of the bottom circumferential prefabricated block 7 is connected to the outer wall of the bottom brick 10. The cross-sectional shape of the inner wall corner of the bottom circumferential prefabricated block 7 is an arc shape, which can facilitate the easier flow of molten iron when pouring. The bottom circumferential prefabricated block 7 can also be made of the same material as the bottom center prefabricated block 9. The purpose is to protect the area where the bottom and the wall meet, improve the corrosion resistance and impact resistance of the area, and also has the advantage of easy replacement.

[0024] The outer wall of the central prefabricated block 9 of the bottom is in a step-like structure, and the inner wall of the bottom brick 10 is in a step-like structure matching the outer wall of the central prefabricated block 9 of the bottom. This arrangement is to avoid the formation of a gap extending directly downward between the central prefabricated block 9 of the bottom and the bottom brick 10, and to avoid molten iron passing through the bottom brick 10 or the central prefabricated block 9 of the bottom along the gap.

[0025] The structure also includes an insulation layer 2 arranged inside the ladle steel shell 1 and attached to the inner wall of the steel shell 1. The insulation layer 2 is formed by lightweight clay bricks, lightweight high-alumina bricks or lightweight silica bricks. These materials have low thermal conductivity, can effectively reduce heat loss, and at the same time reduce the weight of the overall structure, thereby providing thermal insulation protection for the steel shell 1.

[0026] A permanent layer 3 is built inside the insulation layer 2. The permanent layer 3 is made of high-alumina bricks, magnesia bricks or magnesia-carbon bricks. The material of this layer is mainly used to protect and support the working layer. The material used is denser than that of the insulation layer 2 to increase the service life of the steel shell 1.

[0027] When the new refractory lining structure of the ladle is in use, the falling molten iron directly impacts the bottom bricks 10 and the central prefabricated parts of the ladle bottom, especially the central prefabricated blocks 9 of the ladle bottom. Since the central area adopts the structure of prefabricated blocks, it has the characteristics of denser structure, impact resistance and erosion resistance, which can extend the service life of this area. During use, when erosion occurs, the marking block 8 can be revealed, so that the operator can observe the size of the marking block 8. When the marking block 8 becomes smaller and smaller, it means that the erosion of the ladle bottom is serious, and the ladle bottom area can be repaired and the prefabricated blocks can be replaced in time.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of refractory lining structure for a ladle, characterized in that: It includes a working layer directly in contact with molten iron, the working layer includes bottom bricks and wall bricks respectively laid on the bottom and wall areas of the ladle, a slag line area in contact with the surface of the molten iron is provided in the wall brick area, a slag line area coating is provided on the inner wall of the wall brick where the slag line area is located, a bottom center prefabricated block is provided in the middle area of ​​the working layer at the bottom, the bottom center prefabricated block is connected to the surrounding bottom bricks, and the upper surface of the bottom center prefabricated block is flush with the upper surface of the bottom bricks, a marking block is buried inside the bottom center prefabricated block, the center of the marking block is arranged along the vertical direction and forms a multi-step structure.

2. The novel refractory lining structure of a ladle according to claim 1, characterized in that: The working layer also includes a ladle nozzle castable located above the ladle, and the lower end of the ladle nozzle castable is connected to the upper surface of the ladle wall brick.

3. The novel refractory lining structure of a ladle according to claim 1, characterized in that: The marking block is a three-step structure with the top larger and the bottom smaller.

4. The novel refractory lining structure of a ladle according to claim 1, characterized in that: The working layer also includes a plurality of bottom circumferential prefabricated blocks evenly distributed in the circumferential direction of the bottom, the upper ends of the bottom circumferential prefabricated blocks are connected to the lower ends of the wall bricks, and the other ends of the bottom circumferential prefabricated blocks are connected to the outer wall of the bottom bricks.

5. The novel refractory lining structure of a ladle according to claim 1, characterized in that: The outer wall of the central prefabricated block of the bottom is in a step-like structure, and the inner wall of the bottom brick is in a step-like structure matching the outer wall of the central prefabricated block of the bottom.

6. The novel refractory lining structure of a ladle according to claim 1, characterized in that: It also includes an insulation layer which is arranged inside the steel shell of the molten iron ladle and adheres to the inner wall of the steel shell. The insulation layer is formed by light clay bricks, light high-alumina bricks or light silicon bricks.

7. The novel refractory lining structure of a ladle according to claim 6, characterized in that: The interior of the thermal insulation layer is built with a permanent layer, which is formed by high-alumina bricks, magnesia bricks or magnesia-carbon bricks.

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