Lining structure

Abstract

A lining structure, comprising a lining main body and insulation boards. The lining main body is configured to be attached to an inner side wall of a shell of an electrolytic cell, and the side of the lining main body configured to be attached to the inner side wall of the shell of the electrolytic cell is provided with a first groove and a second groove, the first groove being configured to correspond to an electrolyte storage area of the electrolytic cell, and the second groove being configured to correspond to a molten-aluminum storage area of the electrolytic cell. The insulation boards are disposed in the first groove and the second groove, the thickness of the insulation board disposed in the second groove being greater than that of the insulation board disposed in the first groove.

Description

A lining structure

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 202510362894.7, filed on March 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the technical field of electrolytic aluminum, and more particularly to a lining structure. Background Technology

[0004] Currently, under the policy requirements of achieving carbon peaking and carbon neutrality, regulating aluminum industry capacity, and implementing the green development concept, energy conservation and emission reduction to lower carbon emissions in the aluminum industry has become an inevitable trend. Using graphitized or fully graphite cathodes can significantly reduce the furnace bottom voltage drop, thereby reducing ineffective voltage and opening up space for lowering the operating voltage of the electrolytic cell. This is beneficial for improving current efficiency, reducing electricity consumption per ton of aluminum, and increasing the energy utilization rate of electrolytic aluminum. However, in actual production, when the energy balance is insufficient to support low-voltage operation, the electrolytic cell will be in a cold-stroke state, leading to problems such as long extension legs and distorted furnace shape. This results in the electrolytic cell being unable to operate stably and efficiently, affecting its experimental lifespan. Summary of the Invention

[0005] By utilizing the lining structure of one or more embodiments of the present disclosure, one of the technical problems of electrolytic cells easily forming long legs and deformed furnace interiors is solved.

[0006] A liner structure according to some embodiments of this disclosure includes: a liner body for adhering to the inner wall of an electrolytic cell shell, wherein a first groove and a second groove are formed on one side of the liner body adhering to the inner wall of the electrolytic cell shell, wherein the first groove corresponds to the electrolyte storage area of ​​the electrolytic cell, and the second groove corresponds to the aluminum liquid storage area of ​​the electrolytic cell; and an insulation board disposed in the first groove and the second groove; wherein the thickness of the insulation board disposed in the second groove is greater than the thickness of the insulation board disposed in the first groove. Attached Figure Description

[0007] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0008] Figure 1 shows a schematic structural diagram of a liner structure according to some embodiments of the present disclosure.

[0009] The correspondence between the reference numerals and component names in Figure 1 is as follows:

[0010] 100 Lining structure, 110 Lining body, 111 First groove, 112 Second groove, 120 Insulation board, 113 First side, 114 Second side, L1 is the centerline of the length direction of the first groove, L2 is the centerline of the length direction of the lining body, and L3 is the centerline of the length direction of the second groove. Embodiments of the present invention

[0011] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0012] As shown in Figure 1, an inner lining structure 100 is provided according to an embodiment of this disclosure, including an inner lining body 110 and an insulation board 120. The inner lining body 110 is used to adhere to the inner wall of the electrolytic cell shell, and a first groove 111 and a second groove 112 are formed on the side of the inner lining body 110 that adheres to the inner wall of the electrolytic cell shell. The first groove 111 corresponds to the electrolyte storage area of ​​the electrolytic cell, and the second groove 112 corresponds to the aluminum liquid storage area of ​​the electrolytic cell. The insulation board 120 is disposed in the first groove 111 and the second groove 112. The thickness of the insulation board 120 disposed in the second groove 112 is greater than the thickness of the insulation board 120 disposed in the first groove 111.

[0013] It is understood that the lining structure 100 provided according to the embodiments of this disclosure includes an inner lining body 110 and an insulation board 120. The inner lining body 110 can be attached to the inner wall of the electrolytic cell shell, and a first groove 111 and a second groove 112 are formed on the side of the inner lining body 110 that is attached to the inner wall of the electrolytic cell shell. The insulation board 120 is respectively disposed in the first groove 111 and the second groove 112. This configuration improves the overall insulation performance of the electrolytic cell. By analyzing the thermal conductivity differences between the molten aluminum and the electrolyte, the heat dissipation characteristics of the molten and cathode regions of the electrolytic cell, and the energy balance control requirements of graphitized or fully graphite cathodes, the thickness of the insulation plate 120 placed in the second trench 112 can be set to be greater than that of the insulation plate 120 placed in the first trench 111. This significantly improves the insulation performance of the molten aluminum storage area in the electrolytic cell, reducing heat dissipation and preventing the electrolytic cell from being in a cold formation state. This avoids the formation of long extensions and / or the occurrence of distorted furnace shape, thus ensuring energy balance and even distribution within the electrolytic cell. This creates favorable conditions and a foundation for the electrolytic cell to form and maintain a regular furnace shape and good extensions during production, thereby extending the service life of the aluminum electrolytic cell and ensuring stable operation throughout its entire life cycle.

[0014] It is understandable that the material of the inner lining structure 100 can be any one of graphitized carbon blocks, graphitic carbon blocks, and silicon nitride-silicon carbide composite blocks to meet the requirements of the inner lining of the aluminum electrolytic cell. When replacing the anode in the electrolytic cell, a measuring hook can be used to check the length of the extension legs inside the electrolytic cell. By using the aforementioned inner lining structure 100, the heat preservation of the molten zone of the electrolytic cell can be significantly enhanced, and heat dissipation at the aluminum molten area can be reduced, resulting in a balanced energy distribution within the electrolytic cell. Combined with reasonable electrolytic cell parameters, the extension leg length can be maintained between 2cm and 5cm. This creates favorable conditions and a foundation for the electrolytic cell to form and maintain a regular furnace internal shape and good extension legs during production, extending the service life of the aluminum electrolytic cell and ensuring stable operation throughout its entire life cycle.

[0015] For example, as shown in the orientation of the lining structure 100 in Figure 1, the Y-axis direction is the length direction of the lining structure 100, the X-axis direction is the width direction, and the Z-axis direction (perpendicular to the plane of Figure 1) is the thickness direction. The lining structure 100 has a length of 600 mm, a width of 400 mm, and a thickness of 70 mm to 100 mm. Using graphitized or fully graphite cathodes in the electrolytic cell can significantly reduce the furnace bottom voltage drop, thereby reducing ineffective voltage and consequently lowering the operating voltage of the electrolytic cell. This is beneficial for improving current efficiency, reducing electricity consumption per ton of aluminum, and increasing the energy utilization rate of electrolytic aluminum. Compared to using traditional graphite cathodes with a graphite content of 30% and 50%, the energy utilization rate of electrolytic cells using graphitized or fully graphite cathodes can be increased by 1 to 3 times.

[0016] In some examples, as shown in FIG1, when the liner body 110 is installed in the electrolytic cell, the first groove 111 is located above the second groove 112; the shortest distance between the first groove 111 and the second groove 112 is 20mm to 40mm; understandably, the shortest distance between the first groove 111 and the second groove 112 refers to, as shown in FIG1, the distance between the bottom end of the first groove 111 and the top end of the second groove 112. The distance between the top end of the first groove 111 and the top end of the liner body 110 is 15mm to 35mm; the distance between the bottom end of the second groove 112 and the bottom end of the liner body 110 is 15mm to 35mm.

[0017] It is understandable that, as shown in Figure 1, the inner liner body 110 is installed in the installation direction of the electrolytic cell. The first groove 111 is located above the second groove 112, and according to the structure of the electrolytic cell, the shortest distance between the first groove 111 and the second groove 112 is set to 20mm to 40mm; the distance between the top of the first groove 111 and the top of the inner liner body 110 is set to 15mm to 35mm; and the distance between the bottom of the second groove 112 and the bottom of the inner liner body 110 is set to 15mm to 35mm. This ensures that the first groove 111 corresponds to the electrolyte storage area of ​​the electrolytic cell, and the second groove 112 corresponds to the aluminum molten metal storage area. This significantly improves the heat preservation performance of the aluminum molten metal storage area, reduces heat dissipation, avoids the formation of long extensions, and thus ensures energy balance and even distribution within the electrolytic cell.

[0018] Understandably, the shortest distance between the first groove 111 and the second groove 112 can be 20mm, 25mm, 30mm, 35mm, 40mm, or any value or range between these values. Understandably, the distance between the top end of the first groove 111 and the top end of the inner lining body 110 can be 15mm, 20mm, 25mm, 30mm, 35mm, or any value or range between these values. Understandably, the distance between the bottom end of the second groove 112 and the bottom end of the inner lining body 110 can be 15mm, 20mm, 25mm, 30mm, 35mm, or any value or range between these values.

[0019] For example, the shortest distance between the first groove 111 and the second groove 112 can be set to 30 mm; the distance between the bottom end of the second groove 112 and the bottom end of the inner lining body 110 can be set to 25 mm; and the distance between the bottom end of the second groove 112 and the bottom end of the inner lining body 110 can be set to 25 mm.

[0020] In some examples, as shown in Figure 1, along the Y-axis as the length direction, the length of the first groove 111 is the same as the length of the second groove 112, and the shortest distance between the centerline L1 of the first groove 111 in the length direction and the centerline L2 of the inner lining body 110 in the length direction is equal to the shortest distance between the centerline L3 of the second groove 112 in the length direction and the centerline L2 of the inner lining body 110 in the length direction.

[0021] It is understood that the first groove 111 and the second groove 112 have the same length, and the shortest distance between the centerline of the first groove 111 in the length direction and the centerline of the inner lining body 110 in the length direction is the same as the shortest distance between the centerline of the second groove 112 in the length direction and the centerline of the inner lining body 110 in the length direction. This ensures that the longest distance between the centerline of the first groove 111 and the centerline of the inner lining body 110 in the length direction is the same as the longest distance between the centerline of the second groove 112 and the centerline of the inner lining body 110 in the length direction. That is, the side of the inner lining body 110 where the first groove 111 and the second groove 112 are provided (i.e., the side that is attached to the inner wall of the electrolytic cell) is used as the projection plane. The first groove 111 and the second groove 112 are projected onto this projection plane along the X-axis in Figure 1. The two resulting figures are symmetrically arranged about the centerline L2 in the length direction of the inner lining body 110. This ensures the matching degree of the position of the first groove 111 and the electrolyte storage area of ​​the electrolytic cell, and ensures the heat preservation effect of the insulation board 120 at the first groove 111. It also ensures the matching degree of the position of the second groove 112 and the aluminum liquid storage area of ​​the electrolytic cell, and ensures the heat preservation effect of the insulation board 120 at the second groove 112.

[0022] In some examples, the inner liner body 110 has a plurality of first grooves 111 formed horizontally on one side of the inner wall of the electrolytic cell shell, and the plurality of first grooves 111 are arranged at intervals at the same height position; the minimum distance between the first groove 111 closest to the first side 113 of the inner liner body 110 and the first side 113 is 10mm to 30mm in the horizontal direction; the minimum distance between the first groove 111 closest to the second side 114 of the inner liner body 110 and the second side 114 is 10mm to 30mm; wherein the first side 113 and the second side 114 are the sides of the inner liner body 110 that are arranged opposite each other in the horizontal direction on the side of the inner wall of the electrolytic cell shell for attaching to the inner liner body 110.

[0023] Understandably, when multiple first grooves 111 are provided, the minimum distance between the first groove 111 and the first side 113 closest to the first side 113 of the inner lining body 110 in the horizontal direction can be 10mm, 15mm, 20mm, 25mm, 30mm and any value between them or any range between two of them.

[0024] It is understood that multiple first grooves 111 can be provided, with the X-axis direction shown in Figure 1 as the horizontal direction. These multiple first grooves 111 are arranged at the same height in the horizontal direction and spaced apart on the side of the inner lining body used to adhere to the inner wall of the electrolytic cell shell. The side of the inner lining body 110 with the first grooves 111 and the second grooves 112 has a first side and a second side in the horizontal direction, and the first side and the second side are arranged opposite to each other. The minimum distance between the first groove 111 closest to the first side and the first side is 10mm to 30mm; similarly, the minimum distance between the first groove 111 closest to the second side and the second side is 10mm to 30mm. This arrangement facilitates the processing of multiple first grooves 111 according to the actual size of the insulation board 120 to meet the installation requirements of the insulation board 120, and ensures that the first grooves have sufficient distance from both the first and second sides, guaranteeing the structural strength of the inner lining structure 100 and the limiting effect on the insulation board 120.

[0025] For example, two first grooves 111 may be provided, and each first groove 111 is equipped with an insulation board 120 to ensure the insulation effect of the inner lining structure.

[0026] In some examples, the distance between two adjacent first grooves 111 is 10 mm to 30 mm.

[0027] Understandably, the distance between two adjacent first grooves 111 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or any value between them or any range between two of them.

[0028] Understandably, if the distance between adjacent first grooves 111 is set too small, it will make the installation of the insulation board 120 difficult. If the distance is set too large, it will result in a large gap between adjacent insulation boards 120, and the insulation effect at the gap will be poor, thus affecting the overall insulation effect of the inner lining structure 100. Therefore, the distance between two adjacent first grooves 111 is set to 10mm to 30mm.

[0029] In some examples, a plurality of the aforementioned second grooves 112 are formed horizontally on one side of the inner liner body 110 for fitting to the inner wall of the electrolytic cell shell, and the plurality of the aforementioned second grooves 112 are arranged at intervals at the same height position; along the horizontal direction, the minimum distance between the aforementioned second groove 112 closest to the aforementioned first side 113 and the aforementioned first side 113 is 10mm to 30mm; the minimum distance between the aforementioned second groove 112 closest to the aforementioned second side 114 and the aforementioned second side 114 is 10mm to 30mm.

[0030] Understandably, when multiple second grooves 112 are provided, the minimum distance between the first groove 111 and the first side of the inner lining body 110, which is closest to the first side in the horizontal direction, can be 10mm, 15mm, 20mm, 25mm, 30mm, or any value between them or any range between two of them.

[0031] It is understood that multiple second grooves 112 can be provided, with the X-axis direction shown in Figure 1 as the horizontal direction. These multiple second grooves 112 are arranged at the same height in the horizontal direction and spaced apart on the side of the inner wall of the lining body 110, which is used to adhere to the inner sidewall of the electrolytic cell. The minimum distance between the second groove 112 closest to the first side and the first side is 10mm to 30mm; similarly, the minimum distance between the second groove 112 closest to the second side and the second side is 10mm to 30mm. This arrangement facilitates the processing of multiple second grooves 112 according to the actual dimensions of the insulation board 120, meeting the installation requirements of the insulation board 120, and ensuring sufficient distance between the second groove and both the first and second sides, thus guaranteeing the structural strength of the lining structure 100 and the limiting effect on the insulation board 120.

[0032] For example, two second grooves 112 may be provided, and each second groove 112 is equipped with an insulation board 120 to ensure the insulation effect.

[0033] In some examples, the shortest distance between two adjacent second grooves 112 is 10 mm to 30 mm. The shortest distance between two adjacent second grooves 112 refers to the distance between the right side of the second groove 112 near the first side 113 and the left side of the second groove 112 near the second side 114, along the X-axis direction in the orientation of the lining structure 100 in FIG1.

[0034] Understandably, the shortest distance between two adjacent second grooves 112 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or any value between them or any range between two of them.

[0035] Understandably, if the shortest distance between adjacent second grooves 112 is set too small, it will make the installation of the insulation board 120 difficult. If the distance is set too large, it will result in a large gap between adjacent insulation boards 120, and the insulation effect at the gap will be poor, thus affecting the overall insulation effect of the inner lining structure 100. Therefore, the shortest distance between two adjacent second grooves 112 is set to 10mm to 30mm.

[0036] In some examples, as shown in Figure 1, the X-axis direction is the depth direction of the first groove 111 and the second groove 112. The depth of the second groove 112 is greater than the depth of the first groove 111, and the openings of the first groove 111 and the second groove 112 are located on the same plane. The thickness of the insulation board 120 disposed in the first groove 111 is 10mm to 20mm, and the thickness of the insulation board 120 disposed in the second groove 112 is 30mm to 40mm.

[0037] It is understood that the depth of the second trench 112 is greater than the depth of the first trench 111, and the openings of the first trench 111 and the second trench 112 are located on the same plane. This ensures that the thickness of the insulation plate 120 placed in the second trench 112 is greater than that placed in the first trench 111, and that the insulation plate 120 in the second trench 112 does not protrude beyond the opening of the second trench 112, thus avoiding affecting the normal operation of the electrolytic cell. Considering that the thermal conductivity of molten aluminum is better than that of electrolyte, the thicker insulation plate 120 in the second trench 112 significantly improves the insulation performance of the area where the molten aluminum is stored in the electrolytic cell, reducing heat dissipation at this area and preventing the formation of long extensions. This results in a balanced and evenly distributed energy distribution within the electrolytic cell, creating favorable conditions and a foundation for the formation and long-term maintenance of a regular furnace internal shape and good extensions, extending the service life of the aluminum electrolytic cell, and ensuring stable operation throughout its entire life cycle.

[0038] In some embodiments, the thickness of the insulation board 120 disposed in the first groove 111 may be 10 mm to 20 mm; the thickness of the insulation board 120 disposed in the second groove 112 may be 30 mm to 40 mm.

[0039] It should be noted that the insulation board 120 in the second trench 112 can be of different thicknesses depending on the material of the electrolytic cell. Specifically, when the electrolytic cell uses a graphitized cathode, the insulation board 120 in the second trench 112 can be 40mm thick; when the electrolytic cell uses a fully graphite cathode, the insulation board 120 in the second trench 112 can be 30mm thick.

[0040] In some examples, the insulation board 120 mentioned above is a vermiculite insulation board.

[0041] Understandably, vermiculite insulation board can be used for insulation board 120. Vermiculite insulation board has the characteristics of high temperature resistance, good thermal insulation effect, and green environmental protection, which can ensure the insulation effect while improving environmental protection.

[0042] In some examples, the bulk density of the vermiculite insulation board is 0.45 g / cm³. 3 Up to 0.55 g / cm 3 The vermiculite insulation board has a room temperature compressive strength ≥1.8MPa and a high temperature compressive strength ≥1.8MPa, wherein the test temperature for the high temperature compressive strength is ≥500℃; when the heating temperature is 900℃ and the heating time is 3h, the permanent linear change of the vermiculite insulation board is ≤1%; when the hot surface temperature is 600℃, the thermal conductivity of the vermiculite insulation board is ≤0.14W / (m·K); when the hot surface temperature is 800℃, the thermal conductivity of the vermiculite insulation board is ≤0.16W / (m·K).

[0043] It is understandable that the bulk density of the vermiculite insulation board is set to 0.45 g / cm³. 3 Up to 0.55 g / cm 3The room temperature compressive strength of the vermiculite insulation board is set to ≥1.8MPa, and the high temperature compressive strength is set to ≥1.8MPa, wherein the test temperature for the high temperature compressive strength is ≥500℃; when the heating temperature is 900℃ and the heating time is 3h, the permanent linear change of the vermiculite insulation board is set to ≤1%; when the hot surface temperature is 600℃, the thermal conductivity of the vermiculite insulation board is set to ≤0.14W / (m·K); when the hot surface temperature is 800℃, the thermal conductivity of the vermiculite insulation board is set to ≤0.16W / (m·K). To meet the process parameters of electrolysis, the insulation performance of the 100 pairs of insulated boxes for storing electrolytes and for storing molten aluminum in the electrolytic cell is ensured. This reduces heat dissipation at the molten aluminum storage area and avoids the formation of long extensions, thereby ensuring energy balance and even distribution within the electrolytic cell. This creates favorable conditions and a foundation for the electrolytic cell to form and maintain a regular furnace shape and good extensions during production, extending the service life of the aluminum electrolytic cell and ensuring stable operation throughout its entire life cycle.

[0044] For example, in an electrolytic cell that does not use the aforementioned inner lining structure 100, the sidewalls are made of traditional graphite carbon blocks. The electrolytic cell is 600mm long, 400mm wide, and 100mm thick. After the electrolytic cell has been running for 4 months, it is in a cold stroke for a long time. The extension legs gradually grow to more than 20cm and become bloated. In particular, the extension legs at the corners of the electrolytic cell are so severe that they have reached the bottom of the anode. Replacing the corner anodes is extremely difficult. The furnace of the electrolytic cell becomes deformed, the operational stability of the electrolytic cell continues to decline, and the technical and economic indicators gradually deteriorate. By installing the aforementioned lining structure 100 within an electrolytic cell of the same specifications, the lining structure 100 having a length of 600mm, a width of 400mm, and a thickness of 100mm, and with a 20mm thick vermiculite insulation board in the first groove 111 and a 40mm thick vermiculite insulation board in the second groove 112, the insulation effect of the electrolytic cell can be significantly enhanced. After one year of operation, the leg extension length is only 3cm; after two years of operation, the leg extension length is only 4cm. This achieves the formation and long-term maintenance of a regular furnace internal shape in the electrolytic cell during production, consistently maintaining excellent technical and economic indicators. It should be understood that the terms "first," "second," etc., are used only for descriptive distinction and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of this disclosure.

[0045] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0046] It should be understood that in the description of this disclosure, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship as commonly used when the disclosed product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this disclosure and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0047] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup," "installation," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0048] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0049] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0050] The above are merely specific embodiments of this disclosure, enabling those skilled in the art to understand or implement this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0051] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute related technology known to those skilled in the art.

Claims

1. A lining structure, comprising: The inner liner body is used to adhere to the inner wall of the electrolytic cell shell, and a first groove and a second groove are formed on the side of the inner liner body that adheres to the inner wall of the electrolytic cell shell. The first groove corresponds to the area in the electrolytic cell where the electrolyte is stored, and the second groove corresponds to the area in the electrolytic cell where the molten aluminum is stored. Insulation boards are disposed in the first groove and the second groove; The thickness of the insulation board disposed in the second groove is greater than the thickness of the insulation board disposed in the first groove.

2. The lining structure according to claim 1, wherein, When the inner liner body is installed in the electrolytic cell, the first groove is located above the second groove; The shortest distance between the first trench and the second trench is 20mm to 40mm; The distance between the top of the first groove and the top of the inner lining body is 15mm to 35mm; The distance between the bottom end of the second groove and the bottom end of the inner lining body is 15mm to 35mm.

3. The lining structure according to claim 2, wherein, The length of the first groove is the same as the length of the second groove, and the shortest distance between the centerline of the first groove in the length direction and the centerline of the inner lining body in the length direction is equal to the shortest distance between the centerline of the second groove in the length direction and the centerline of the inner lining body in the length direction.

4. The lining structure according to claim 2, wherein, The inner lining body is provided with a plurality of first grooves on one side of the inner wall of the electrolytic cell shell, which are used to fit the cell shell. The plurality of first grooves are arranged at intervals at the same height position. Along the horizontal direction, the shortest distance between the first groove closest to the first side of the inner lining body and the first side is 10mm to 30mm; the shortest distance between the first groove closest to the second side of the inner lining body and the second side is 10mm to 30mm. Wherein, the first side and the second side are the sides of the inner lining body that are arranged opposite each other in the horizontal direction for fitting into the inner wall of the electrolytic cell shell.

5. The lining structure according to claim 4, wherein, The shortest distance between two adjacent first trenches is 10mm to 30mm.

6. The lining structure according to claim 2, wherein, On one side of the inner lining body that is used to fit the inner wall of the electrolytic cell, a plurality of second grooves are formed in the horizontal direction, and the plurality of second grooves are arranged at intervals at the same height position. Along the horizontal direction, the shortest distance between the second groove closest to the first side and the first side is 10mm to 30mm; the shortest distance between the second groove closest to the second side and the second side is 10mm to 30mm. Wherein, the first side and the second side are the sides of the inner lining body that are arranged opposite each other in the horizontal direction for fitting into the inner wall of the electrolytic cell shell.

7. The lining structure according to claim 6, wherein, The shortest distance between two adjacent second grooves is 10mm to 30mm.

8. The lining structure according to claim 1, wherein, The depth of the second trench is greater than the depth of the first trench, and the openings of the first trench and the second trench are located on the same plane. The thickness of the insulation board disposed in the first trench is 10mm to 20mm; The insulation board disposed in the second groove has a thickness of 30mm to 40mm.

9. The lining structure according to any one of claims 1 to 8, wherein, The insulation board is a vermiculite insulation board.

10. The lining structure according to claim 9, wherein, The volume density of the vermiculite insulation board is 0.45 g / cm 3 to 0.55 g / cm 3 ; The vermiculite insulation board has a room temperature compressive strength ≥1.8MPa and a high temperature compressive strength ≥1.8MPa, wherein the test temperature for the high temperature compressive strength is ≥500℃. When the heating temperature is 900℃ and the heating time is 3h, the permanent linear change of the vermiculite insulation board is ≤1%; When the hot surface temperature is 600℃, the thermal conductivity of the vermiculite insulation board is ≤0.14W / (m·K); When the hot surface temperature is 800℃, the thermal conductivity of the vermiculite insulation board is ≤0.16W / (m·K).

Images