Online repairing method for side part of aluminum electrolysis cell

Abstract

The invention provides an online repairing method for the side portion of an aluminum electrolysis cell, and belongs to the technical field of electrolysis cell repairing. The online repairing method comprises the steps that monitoring information of the electrolysis cell is obtained, and a to-be-repaired part is determined according to the monitoring information; according to the geometric information of the to-be-repaired part, a repairing material is selected; the to-be-repaired part is pretreated; reducing the temperature of the to-be-repaired part to a target temperature, keeping the target temperature, and filling the to-be-repaired part with the repairing material to form a repaired part; and the repaired part is cooled. Under the conditions of accurately determining the repairing position and keeping the normal operation of the electrolytic cell, a local cooling mode is adopted, the repairing position is filled with the repairing material, and then cooling is performed, so that the stability and safety of the repaired part are improved, and the working temperature of the electrolytic cell shell of the repaired part is monitored and recorded; and safe, stable and efficient production of the repaired part is further ensured.

Description

Technical Field

[0001] This application belongs to the technical field of electrolytic cell repair, and particularly relates to an on-line repair method for the side of an aluminum electrolytic cell. Background Art

[0002] In the process of aluminum electrolysis production, the electrolytic cell is one of the core equipment, and its operating stability is directly related to production efficiency and product quality. With the extension of the service time of the electrolytic cell and the increase of the cell age, the side carbon blocks of the electrolytic cell are easily corroded and consumed, resulting in problems such as a high cell shell and an increased risk of side leakage. These problems not only affect the normal operation of the electrolytic cell but may also cause safety accidents, bringing significant economic losses to the enterprise.

[0003] At present, the repair methods for the side damage of the electrolytic cell include two types: traditional overhaul methods and on-line repair methods; traditional overhaul methods generally require production stoppage, which has a long repair cycle, high cost, and a large amount of aluminum production will be lost during the production stoppage period. Compared with the traditional overhaul method, the on-line repair method can reduce the production stoppage time to a certain extent, but there are problems such as unstable repair effect and easy re-damage of the repaired parts. Summary of the Invention

[0004] Therefore, the main purpose of this application is to provide an on-line repair method for the side of an aluminum electrolytic cell, which solves at least one technical problem existing in the prior art.

[0005] To solve the above problems, this application provides an on-line repair method for the side of an aluminum electrolytic cell, including: Obtaining the monitoring information of the electrolytic cell, and determining the part to be repaired according to the monitoring information; Selecting a repair material according to the geometric information of the part to be repaired; Performing pretreatment on the part to be repaired; Reducing the temperature of the part to be repaired to a target temperature, maintaining the target temperature, and filling the repair material onto the part to be repaired to form a repaired part; Performing a cooling treatment on the repaired part.

[0006] Optionally, the step of obtaining the monitoring information of the electrolytic cell and determining the part to be repaired according to the monitoring information includes: Obtaining the real-time temperature of the electrolytic cell shell, when the real-time temperature of the electrolytic cell shell is greater than the preset temperature, obtaining the dimensional parameters of the electrolytic cell stiffener plate, and determining the part to be repaired based on the dimensional parameters of the electrolytic cell stiffener plate.

[0007] Optionally, the step of obtaining the monitoring information of the electrolytic cell and determining the part to be repaired according to the monitoring information further includes: Obtain the real-time temperature of the electrolyzer cell shell. When the real-time temperature of the electrolyzer cell shell is greater than the preset temperature, obtain the remaining volume of the side carbon blocks of the electrolyzer, and determine the part to be repaired based on the remaining volume of the side carbon blocks of the electrolyzer.

[0008] Optionally, the step of selecting a repair material according to the geometric information of the part to be repaired includes: Select a repair material with the same size and shape as the part to be repaired according to the size and shape of the part to be repaired.

[0009] Optionally, the repair material includes silicon carbonitride side blocks, ceramic fiber boards, and calcium fluoride.

[0010] Optionally, the step of preprocessing the part to be repaired includes: Cut off the rib plates on the electrolyzer at the part to be repaired; Clean the impurities at the part to be repaired.

[0011] Optionally, the step of reducing the temperature of the part to be repaired to the target temperature, maintaining the target temperature, and filling the repair material onto the part to be repaired to form the repaired part includes: Use the air-cooling method to reduce the temperature of the preprocessed part to be repaired to the target temperature and maintain the target temperature; Fill the silicon carbonitride side blocks and ceramic fiber boards onto the part to be repaired, use calcium fluoride to fill the gaps, and fix the silicon carbonitride side blocks and ceramic fiber boards to form the repaired part.

[0012] Optionally, the step of cooling the repaired part includes: Use air-cooling to cool the electrolyzer cell shell of the repaired part to bond the calcium fluoride with the silicon carbonitride side blocks and the ceramic fiber boards.

[0013] Optionally, after the step of cooling the repaired part, the on-line repair method further includes: welding new rib plates on the electrolyzer cell shell around the repaired position after cooling treatment.

[0014] Optionally, after welding new rib plates on the repaired position after cooling treatment, the on-line repair method further includes: continuously monitoring and recording the working temperature of the electrolyzer cell shell of the repaired part.

[0015] By means of the above technical solution, the invention of the present application has at least the following beneficial effects: An on-line repair method for the side of an aluminum electrolytic cell is provided in an embodiment of the present application. It is designed based on the repair requirements of the side carbon blocks of the electrolytic cell. By accurately determining the repair position, while keeping the electrolytic cell running normally, a local cooling method is adopted to fill the repair material at the repair position and then cool it down, which improves the stability and safety of the repaired part. At the same time, it also ensures the safety of the repair process and the quality of the repair effect. And by monitoring and recording the working temperature of the cell shell of the repaired part, the safe, stable and efficient production of the repaired part is further ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An on-line repair method for the side of an aluminum electrolytic cell according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0019] In the present application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0021] See in combination Figure 1As shown, according to an embodiment of the present application, an on-line repair method for the side of an aluminum electrolytic cell is provided, including: Step S11, obtaining the monitoring information of the electrolytic cell, and determining the part to be repaired according to the monitoring information.

[0022] Obtain the real-time temperature information of the cell shell of the electrolytic cell through an infrared thermal imager or a thermocouple. When the real-time temperature of the cell shell of the electrolytic cell is greater than the preset temperature, obtain the dimensional parameters of the stiffening plate of the electrolytic cell, and determine the part to be repaired based on the dimensional parameters of the stiffening plate of the electrolytic cell.

[0023] Alternatively, obtain the real-time temperature of the cell shell of the electrolytic cell. When the real-time temperature of the cell shell of the electrolytic cell is greater than the preset temperature, obtain the remaining volume of the side carbon block of the electrolytic cell, and determine the part to be repaired based on the remaining volume of the side carbon block of the electrolytic cell.

[0024] Among them, the dimensional parameters of the stiffening plate of the electrolytic cell generally refer to the deformation condition of the stiffening plate. The deformation condition of the stiffening plate reflects the erosion degree of the side carbon block. If the carbon block bulges out at a certain place, it means that the furnace lining at the corresponding position becomes thinner, and the side of the electrolytic cell needs to be repaired immediately.

[0025] In this embodiment, the preset temperature refers to the working temperature of the steel shell on the side wall of the electrolytic cell.

[0026] Among them, obtaining the remaining volume of the side carbon block of the electrolytic cell means observing whether there is a missing phenomenon in the side carbon block of the electrolytic cell; if the damage of the side carbon block is relatively serious, for example, the carbon block is completely missing or mostly missing, and the electrolyte and molten aluminum have directly contacted the channel steel shell, at this time, the carbon block needs to be repaired. If the carbon block is partially missing, but the overall structure is still acceptable, and the main problem is local erosion or weakness of the furnace lining, the protection effect can be enhanced by repairing the side of the electrolytic cell.

[0027] In this embodiment, the displacement of the stiffening plate is monitored by a laser rangefinder to reflect the deformation condition of the stiffening plate; in other embodiments, visual inspection or strain gauge sensors can also be used to monitor the deformation of the stiffening plate. Visual inspection is to take regular photos and compare the position changes of the stiffening plate to reflect the deformation condition of the stiffening plate; using strain gauge sensors is to monitor the stress change of the stiffening plate in real time to reflect the deformation condition of the stiffening plate.

[0028] Step S12, selecting a repair material according to the geometric information of the part to be repaired.

[0029] Select a repair material with the same size and shape as the part to be repaired according to the size and shape of the part to be repaired.

[0030] During the on-line repair of the side of the electrolytic cell, the size of the part to be repaired refers to the damaged area, and the shape of the part to be repaired refers to the geometric features of the damaged position; the size and shape of the part to be repaired determine the size and shape of the repair material.

[0031] Among them, the repair materials usually include silicon carbonitride side blocks, ceramic fiber boards, and calcium fluoride.

[0032] The silicon carbonitride side blocks are resistant to high temperatures (>1600 °C), resistant to molten salt corrosion, and have much higher strength than ordinary carbon blocks; they have good chemical compatibility with the electrolyte and are not easily eroded by molten aluminum. The ceramic fiber board has high heat insulation, reducing the impact of thermal stress on the repaired part. Calcium fluoride is generally used as a filler for filling gaps to ensure the stability of the structure. The use of repair materials can effectively improve the strength and durability of the repaired part.

[0033] Step S13, pre-treat the part to be repaired.

[0034] Clean impurities and polish the part to be repaired. Avoid forming air gaps or weak bonding layers between the repair material and the substrate, reducing the repair strength, and at the same time improving the mechanical biting ability of the repair material.

[0035] Step S14, lower the temperature of the part to be repaired to the target temperature, maintain the target temperature, and fill the repair material onto the part to be repaired to form the repaired part.

[0036] Among them, the target temperature refers to the maximum allowable temperature threshold that the part to be repaired needs to reach through compressed air cooling before filling the repair material; in this embodiment, the target temperature is ≤200 °C. Create a thermodynamically stable environment for the repair material to avoid material failure caused by high temperature. At the same time, ensure the reliable bonding of the repair material layer and the cell lining to prevent thermal stress damage.

[0037] Step S15, cool the repaired part.

[0038] Cool the cell shell of the repaired part with high-pressure air to ensure that calcium fluoride is fully bonded to the silicon carbonitride side blocks and the ceramic fiber board.

[0039] Among them, in this embodiment, the cooling treatment time is 24 h, which is used to eliminate the internal thermal stress of the repair material layer, make calcium fluoride fully crystallize, and enhance the bonding strength. Make the silicon carbonitride side blocks and the ceramic fiber board achieve structural stabilization at low temperatures.

[0040] Step S16, weld new stiffeners on the cell shell around the repaired position after cooling treatment.

[0041] The new rib welding position is on the original undamaged cell shell steel plate around the repaired position, and then the new rib is welded to the cell shell steel plate. Due to the local material replacement of the repaired cell shell, the stiffness distribution changes. As a stiffener, the rib forms a space truss structure through welding, making the elastic modulus of the repaired part match that of the surrounding cell shell; at the same time, the rigid constraint of the rib can limit the free expansion of the repaired part.

[0042] As a refinement and extension of the specific implementation manner of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another on-line repair method for the side of an aluminum electrolytic cell is provided, and this method includes: Step S21, obtain the monitoring information of the electrolytic cell, and determine the part to be repaired according to the monitoring information.

[0043] Obtain the real-time temperature information of the cell shell of the electrolytic cell through an infrared thermal imager or a thermocouple. When the real-time temperature of the cell shell of the electrolytic cell is greater than the preset temperature, obtain the dimensional parameters of the ribs of the electrolytic cell, and determine the part to be repaired based on the dimensional parameters of the ribs of the electrolytic cell.

[0044] Or, obtain the real-time temperature of the cell shell of the electrolytic cell. When the real-time temperature of the cell shell of the electrolytic cell is greater than the preset temperature, obtain the remaining volume of the side carbon block of the electrolytic cell, and determine the part to be repaired based on the remaining volume of the side carbon block of the electrolytic cell.

[0045] Among them, the dimensional parameters of the ribs of the electrolytic cell generally refer to the deformation of the ribs. The rib deformation reflects the erosion degree of the side carbon block. If the carbon block bulges out at a certain place, it means that the furnace lining at the corresponding position becomes thinner, and the side of the electrolytic cell needs to be repaired immediately.

[0046] In this embodiment, the preset temperature refers to the working temperature of the steel shell on the side wall of the electrolytic cell.

[0047] Among them, obtaining the remaining volume of the side carbon block of the electrolytic cell means observing whether there is a missing phenomenon in the side carbon block of the electrolytic cell; if the damage of the side carbon block is relatively serious, for example, the carbon block is completely missing or mostly missing, and the electrolyte and molten aluminum have directly contacted the channel steel shell, at this time, the carbon block needs to be repaired. If the carbon block is partially missing, but the overall structure is still okay, and the main problem is local erosion or weakness of the furnace lining, the protection effect can be enhanced by repairing the side of the electrolytic cell.

[0048] In this embodiment, the displacement of the rib is monitored by a laser rangefinder to reflect the deformation of the rib; in other embodiments, visual inspection or strain gauge sensors can also be used to monitor the deformation of the rib. Visual inspection is to take regular photos and compare the position changes of the ribs to reflect the deformation of the ribs; using strain gauge sensors is to monitor the stress change of the ribs in real time to reflect the deformation of the ribs.

[0049] Step S22: Select a repair material according to the geometric information of the part to be repaired.

[0050] Select a repair material that is the same size and shape as the part to be repaired according to the size and shape of the part to be repaired.

[0051] During the on-line repair of the side of the electrolytic cell, the size of the part to be repaired refers to the damaged area, and the shape of the part to be repaired refers to the geometric features of the damaged position; the size and shape of the part to be repaired determine the size and shape of the repair material.

[0052] Among them, the repair materials usually include silicon carbonitride side blocks, ceramic fiber boards, and calcium fluoride.

[0053] The silicon carbonitride side blocks are resistant to high temperatures (>1600°C), resistant to molten salt corrosion, and have much higher strength than ordinary carbon blocks; they have good chemical compatibility with the electrolyte and are not easily eroded by molten aluminum. The ceramic fiber boards have high heat insulation properties and reduce the impact of thermal stress on the repaired part. Calcium fluoride is generally used as a filler for filling gaps to ensure the stability of the structure. The use of repair materials can effectively improve the strength and durability of the repaired part.

[0054] Step S23: Pretreat the part to be repaired.

[0055] Step S231: Cut off the stiffeners on the electrolytic cell at the part to be repaired; as a strengthening structure of the electrolytic cell shell, cutting off the stiffeners can fully expose the part to be repaired, facilitating the filling of the repair material. Step S232: Clean the impurities at the part to be repaired; specifically, use a pneumatic pick to clean the electrolyte, aluminum, residual carbon blocks, etc. at the part to be repaired; remove the impurities formed on the surface of the part to be repaired to avoid the formation of air gaps or weak bonding layers between the repair material and the substrate, reducing the repair strength.

[0056] Step S233: Grind the surface of the part to be repaired; form a microscopic uneven structure through grinding to improve the mechanical biting ability of the repair material; at the same time, ensure that the flatness of the part to be repaired is consistent to avoid stress concentration leading to the peeling of the repair material.

[0057] Step S24: Lower the temperature of the part to be repaired to the target temperature, maintain the target temperature, and fill the repair material onto the part to be repaired to form a repaired part.

[0058] Step S241: Use compressed air to lower the temperature of the pretreated part to be repaired to the target temperature. Among them, the target temperature refers to the maximum allowable temperature threshold that the part to be repaired needs to reach through cooling with compressed air before filling the repair material; in this embodiment, the target temperature is ≤200°C. This creates a thermodynamically stable environment for the repair material, avoiding material failure caused by high temperatures. At the same time, it ensures the reliable bonding between the repair material layer and the tank lining, preventing thermal stress damage.

[0059] Low-temperature filling of the silicon carbonitride side block can maintain the original strength; the ceramic fiber board has better flexibility at 200°C and is easy to fit complex damaged surfaces; calcium fluoride is in a semi-sintered state at 200°C, which can not only flow to fill the gaps but also quickly solidify to form a chemical-mechanical double bond.

[0060] Step S242, while maintaining at the target temperature, fill the silicon carbonitride side block and the ceramic fiber board on the part to be repaired; use calcium fluoride to fill the gaps to fix the silicon carbonitride side block and the ceramic fiber board, forming the repaired part.

[0061] While maintaining at the target temperature, fill the inner side of the part to be repaired with the silicon carbonitride side block to provide mechanical support and prevent the deformation of the electrolytic cell tank shell, and then use calcium fluoride to fill the gaps; lay the ceramic fiber board on the back of the silicon carbonitride side block, and then use calcium fluoride to fill the gaps; form the final repaired part.

[0062] First, place the silicon carbonitride side block to resist the erosion of molten aluminum, secondly, cover the outer layer with the ceramic fiber board to reduce heat loss, and finally, calcium fluoride is used to fill the gaps to integrate into a composite structure to avoid delamination between layers.

[0063] Step S25, perform a cooling treatment on the repaired part.

[0064] Use high-pressure air to cool the electrolytic cell tank shell of the repaired part to ensure that calcium fluoride is fully bonded to the silicon carbonitride side block and the ceramic fiber board.

[0065] Among them, in this embodiment, the cooling treatment time is 24 hours, which is used to eliminate the internal thermal stress of the repair material layer, make calcium fluoride fully crystallize, and enhance the bonding strength. This enables the silicon carbonitride side block and the ceramic fiber board to achieve structural stabilization at low temperatures.

[0066] Step S26, weld new stiffeners on the electrolytic cell tank shell around the repaired position after the cooling treatment.

[0067] The welding position of the new stiffener is the original electrolytic cell tank shell steel plate that is not damaged around the repaired position, and then the new stiffener is welded on the electrolytic cell tank shell steel plate. Due to the replacement of local materials in the repaired tank shell, the stiffness distribution changes. The stiffener, as a reinforcing rib, forms a space truss structure through welding to match the elastic modulus of the repaired part with the surrounding electrolytic cell tank shell; at the same time, the rigid constraint of the stiffener can limit the free expansion of the repaired part.

[0068] Step S27: Continuously monitor and record the operating temperature of the cell shell at the repaired part to ensure the operating performance of the repaired part.

[0069] The method of online repairing the side of the electrolytic cell with silicon carbonitride side blocks and ceramic fiber boards realizes the effective repair of the side carbon blocks of the electrolytic cell, can significantly improve the repair efficiency and reduce the repair cost. Through continuous monitoring and recording of the repaired part, the durability and stability of the repair effect are ensured. It reduces the production stoppage losses caused by the damage of the side carbon blocks of the electrolytic cell; reduces the high cost of major overhaul of the cell; improves the strength and durability of the repaired part; ensures the safety of the repair process and the quality of the repair effect.

[0070] The operation method of online repairing the side of the electrolytic cell with silicon carbonitride side blocks + ceramic fiber boards also has significant advantages in terms of economy. First of all, through the online repair method, it avoids the production loss of the output caused by the damage of the side carbon blocks of the electrolytic cell (calculated at 3.046 tons / tank / day, repair cycle of 25 days, roasting start-up of 5 days, edge trimming of 1 day, total of 31 days, loss of aluminum output of 94.45 tons, abnormal production management period of 90 days after the cell is started up, average power efficiency of 88%, 5.5% lower than the normal production of 93.5%, cumulative loss of output of 16.13 tons), and reduces the high cost of major overhaul of the cell (1.75 million yuan / unit). Secondly, the repair materials and processes adopted in this operation method have a high cost performance, can reduce the repair cost while ensuring the repair effect. The material cost per point = 362 yuan (silicon carbonitride side block) + 80 yuan (ceramic fiber board) + 115 yuan (calcium fluoride) = 557 yuan, labor cost: 200 yuan, total of 757 yuan / point. In addition, the temperature of the cell shell at the repaired side position drops significantly after repair, saving the air volume used for forced cooling with compressed air.

[0071] In summary, after taking side repair, the aluminum output loss per cell is reduced by 110.58 tons, and the profit is increased by 221,200 yuan; the cost of major overhaul of the cell is reduced by 175,000 yuan (depreciated over 10 years); the online repair materials and labor input are 757 yuan / point. After adopting side online repair to avoid major overhaul of the cell, the cumulative economic benefit per cell in the current year is 221,160 + 175,000 - 757 = 395,403 yuan.

[0072] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0073] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as within the protection scope of the present application.

Claims

1. An on-line side repair method for an aluminum electrolysis cell, characterized in that, Including: Obtain the monitoring information of the electrolytic cell, and determine the part to be repaired according to the monitoring information; Select a repair material according to the geometric information of the part to be repaired; Perform pretreatment on the part to be repaired; Reduce the temperature of the part to be repaired to the target temperature, maintain the target temperature, and fill the repair material onto the part to be repaired to form a repaired part; Perform a cooling treatment on the repaired part.

2. The on-line side repair method of an aluminum electrolytic cell according to claim 1, characterized in that The step of obtaining the monitoring information of the electrolytic cell and determining the part to be repaired according to the monitoring information includes: Obtain the real-time temperature of the electrolytic cell shell. When the real-time temperature of the electrolytic cell shell is greater than the preset temperature, obtain the dimensional parameters of the electrolytic cell stiffener plate, and determine the part to be repaired based on the dimensional parameters of the electrolytic cell stiffener plate.

3. The on-line side repair method of an aluminum electrolytic cell according to claim 1, characterized in that, The step of obtaining the monitoring information of the electrolytic cell and determining the part to be repaired according to the monitoring information further includes: Obtain the real-time temperature of the electrolytic cell shell. When the real-time temperature of the electrolytic cell shell is greater than the preset temperature, obtain the remaining volume of the side carbon block of the electrolytic cell, and determine the part to be repaired based on the remaining volume of the side carbon block of the electrolytic cell.

4. A method for on-line repair of the side part of an aluminum electrolytic cell according to any one of claims 1, 2 or 3, characterized in that, The step of selecting a repair material according to the geometric information of the part to be repaired includes: Select a repair material with the same size and shape as the part to be repaired according to the size and shape of the part to be repaired.

5. A method for on-line repair of the side part of an aluminum electrolysis cell according to claim 4, characterized in that, The repair material includes a silicon carbonitride side block, a ceramic fiber board, and calcium fluoride.

6. A side online repair method for an aluminum electrolytic cell according to claim 5, characterized in that, The step of performing pretreatment on the part to be repaired includes: Cut off the stiffener plate on the electrolytic cell at the part to be repaired; Clean the impurities at the part to be repaired.

7. A method for on-line repair of the side part of an aluminum electrolysis cell according to claim 6, characterized in that The step of reducing the temperature of the part to be repaired to the target temperature, maintaining the target temperature, and filling the repair material onto the part to be repaired to form a repaired part includes: Use an air-cooling method to reduce the temperature of the pretreated part to be repaired to the target temperature and maintain the target temperature; Fill the silicon carbonitride side block and the ceramic fiber board on the part to be repaired, use calcium fluoride to fill the gaps, and fix the silicon carbonitride side block and the ceramic fiber board to form a repaired part.

8. A method for on-line repair of the side part of an aluminum electrolysis cell according to claim 7, characterized in that, The step of performing a cooling treatment on the repaired part includes: Perform a cooling treatment on the electrolytic cell shell of the repaired part by air-cooling to bond the calcium fluoride with the silicon carbonitride side block and the ceramic fiber board.

9. The on-line side repair method of an aluminum electrolytic cell according to claim 8, characterized in that, After the step of performing a cooling treatment on the repaired part, the on-line repair method further includes: welding a new stiffener plate on the electrolytic cell shell around the repaired position after the cooling treatment.

10. A method for on-line repair of the side part of an aluminum electrolysis cell according to claim 9, characterized in that, After welding a new stiffener plate on the repaired position after the cooling treatment, the on-line repair method further includes: continuously monitoring and recording the working temperature of the electrolytic cell shell at the repaired part.

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