Charging method of prebaked anode aluminum electrolysis cell
By using a prebaked anode aluminum electrolytic cell loading method, and by uniformly laying electrolyte blocks and cryolite to form solid and semi-hollow cavity structures, the problem of uneven heating during the aluminum electrolytic cell roasting process is solved, thus achieving stable operation of the electrolytic cell and extending its service life.
Patent Information
- Application Number
- CN202410923983.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-11-21
AI Technical Summary
In existing aluminum electrolytic cell charging methods, uneven heating during the roasting process requires continuous adjustment of the anode current distribution, leading to unstable operation of the electrolytic cell.
The prebaked anode aluminum electrolytic cell is charged by uniformly laying electrolyte blocks, cryolite and covering material to form solid cavity and semi-hollow cavity structures, ensuring temperature uniformity and anode current distribution uniformity in the four corners and central seam areas of the electrolytic cell cavity.
This achieves uniform temperature and uniform anode current distribution during the roasting process, ensuring smooth start-up of the electrolytic cell, extending its service life, and improving operational stability.
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Figure CN120989673A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aluminum electrolytic cell loading, and in particular to a method for loading a prebaked anode aluminum electrolytic cell, the aluminum electrolytic cell, and its application. Background Technology
[0002] The loading of aluminum electrolytic cells is a complex and precise process. It involves assembling the aluminum electrolytic cells and filling them with the necessary materials to ensure that the electrolytic cells can operate efficiently and stably and produce high-quality aluminum.
[0003] The existing method of loading aluminum electrolytic cells into the furnace is to use a semi-cavity filling method. However, the temperature rise is uneven during the roasting process, and the anode current distribution needs to be constantly adjusted to ensure that the anode blocks of the electrolytic cell conduct electricity evenly.
[0004] Therefore, this application is made to solve the problem of uneven heating in aluminum electrolytic cells during the roasting process in the prior art. Summary of the Invention
[0005] The purpose of this application is to provide a method for charging a prebaked anode aluminum electrolytic cell, which can achieve a uniform heating gradient during the start-up of the electrolytic cell and a uniform anode current distribution.
[0006] To achieve the above objectives, this application provides the following solution:
[0007] This application provides a method for charging a prebaked anode aluminum electrolytic cell. The aluminum electrolytic cell includes an electrolytic cell cavity, with cathode carbon blocks laid at the bottom of the electrolytic cell cavity and multiple sets of anode blocks arranged on top of the cathode carbon blocks. The method for charging the prebaked anode aluminum electrolytic cell includes:
[0008] The first electrolyte block is evenly laid on the surface of the artificial leg extension and the first target area, wherein the first target area includes the surface of the cathode carbon block located in the middle seam area, and the first target area includes the surfaces of the cathode carbon blocks on both sides of the multiple sets of anode blocks parallel to the middle seam area. The first electrolyte block is laid at the same height as the artificial leg extension.
[0009] The second electrolyte block is laid on both sides of the aluminum outlet and both sides of the flue opening to form an isolation wall. The isolation wall is used to isolate the aluminum outlet and the flue opening from the filler located at the four corners of the electrolytic cell cavity.
[0010] The first cryolite is evenly spread in the second target area, wherein the second target area includes the central seam area, the areas on both sides of the multiple sets of anode blocks parallel to the central seam, and the four corners of the electrolytic cell cavity. The first cryolite is spread to cover the surface of the first electrolyte block and the artificial leg extension.
[0011] The baffle plate is placed between the outer edge of the four corner anodes and the edge of the side bricks, wherein the four corner anodes include anode blocks located at the four corners of multiple sets of anode blocks;
[0012] The covering material is laid on the plane formed by the central seam area, the top of the multiple sets of anode blocks, and the top of the tank shell. The baffle plate is used to isolate the four corners of the electrolytic cell cavity from the covering material.
[0013] Optionally, before the step of laying the second electrolyte block on both sides of the aluminum outlet end and the isolation wall formed on both sides of the flue opening, the charging method of the prebaked anode aluminum electrolytic cell further includes:
[0014] Calcium fluoride is evenly spread around the perimeter of the electrolytic cell cavity.
[0015] Optionally, before the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for loading the prebaked anode aluminum electrolytic cell further includes:
[0016] Soda ash is laid on top of the first cryolite.
[0017] Optionally, before the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for loading the prebaked anode aluminum electrolytic cell further includes:
[0018] The gaps between the multiple sets of anode blocks were sealed with first-grade rock wool.
[0019] Before the step of laying the covering material on the plane formed by the top of the multiple sets of anode blocks and the top of the tank shell, the charging method of the prebaked anode aluminum electrolytic cell further includes:
[0020] The second rock wool is used to fill the gap between the baffle plate and the anode frame.
[0021] Optionally, the covering material includes a third electrolyte block and a second cryolite, and the laying sequence of the covering material is as follows:
[0022] First, lay the third electrolyte block, and then lay the second cryolite on top of the third electrolyte block.
[0023] Optionally, the diameter of the first electrolyte block is 1-5cm; the laying height of the first electrolyte block is 30cm-35cm; and the diameter of the second electrolyte block is 20-30cm.
[0024] Optionally, the weight of the first cryolite is 5 tons ± 0.5 kg. In the central region and the region on both sides of the multiple sets of anode blocks parallel to the central seam, the first cryolite is laid at a height of 38-40 cm from the surface of the cathode carbon block. In the four corner regions of the electrolytic cell cavity, the first cryolite is laid at a height of 20-25 cm from the surface of the cathode carbon block.
[0025] Optionally, the weight of the third electrolyte block is 6 tons ± 60 kg, the thickness of the third electrolyte block is 90-100 mm, and the diameter of the third electrolyte block is 10-20 mm.
[0026] Optionally, the thickness of the second cryolite layer is 90-110cm.
[0027] Optionally, the weight of calcium fluoride is 200-300 kg.
[0028] According to the specific embodiments provided in this application, the following technical effects are disclosed:
[0029] This application provides a method for loading a prebaked anode aluminum electrolytic cell. A first electrolyte block is evenly laid on the surface of the artificial extension legs and the target area. A second electrolyte block is then laid on both sides of the aluminum outlet and the flue opening to form an isolation wall, preventing electrolyte leakage from the aluminum outlet and the flue opening. A first cryolite block is evenly laid in the second target area. A baffle plate is placed between the outer edges of the four corner anodes and the edges of the side bricks. Covering material is then laid in the central seam area and on the plane formed by the tops of multiple anode blocks and the top structure of the cell shell, creating a solid cavity loading and a four-corner semi-cavity structure. This reduces oxidation of the cathode blocks and artificial extension legs during startup roasting, protecting the aluminum electrolytic cell lining. During roasting, the roasting temperature changes uniformly and stably, the anode current is evenly distributed, and the furnace walls are stably formed after startup, effectively ensuring the smooth completion of the electrolytic cell roasting startup, ensuring continuous, stable, and efficient operation after startup, and extending the service life of the electrolytic cell. This method has high promotional value and economic benefits. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 A top view of a prebaked anode aluminum electrolytic cell provided in an embodiment of this application;
[0032] Figure 2 This is a graph showing the average temperature rise at the four corners of the 4081# calcination tank according to an embodiment of this application.
[0033] Figure 3 This is a temperature rise curve of the average temperature of the calcination seam in the 4081# sintering tank provided in an embodiment of this application;
[0034] Figure 4 This is a curve showing the average temperature rise of the AB side of the 4081# calcination tank according to an embodiment of this application.
[0035] Figure 5 This is a curve showing the overall average temperature rise during calcination of 4081# tank according to an embodiment of this application.
[0036] Figure 6 This is a graph showing the average temperature rise at the four corners of the 5111# calcination tank according to an embodiment of this application.
[0037] Figure 7 This is a curve showing the average temperature rise of the 5111# calcination seam in an embodiment of this application.
[0038] Figure 8 This is a curve showing the average temperature rise of the AB side of the 5111# calcination tank according to an embodiment of this application.
[0039] Figure 9 This is a curve showing the overall average temperature rise during calcination of the 5111# blast furnace, provided in an embodiment of this application.
[0040] Figure 1 In the middle, 1. motor block; 2. second electrolyte block; 3. aluminum outlet or flue opening. Detailed Implementation
[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0042] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0043] In an exemplary embodiment, a method for loading a prebaked anode aluminum electrolytic cell is provided. The aluminum electrolytic cell includes an electrolytic cell cavity, a cathode carbon block is laid at the bottom of the electrolytic cell cavity, and multiple sets of anode blocks are arranged on top of the cathode carbon blocks. The area between the anode blocks placed along the short axis of the electrolytic cell is a central seam, and the area between the anode blocks placed along the long axis of the electrolytic cell is a gap seam. The method includes the following steps:
[0044] Step 110: Evenly spread the first electrolyte block on the surface of the artificial leg extension and the first target area, wherein the first target area includes the surface of the cathode carbon block located in the middle seam area, and the first target area includes the surfaces of the cathode carbon blocks on both sides of multiple sets of anode blocks parallel to the middle seam area, the surfaces of the cathode carbon blocks on both sides of the multiple sets of anode blocks are located between the outer side of the anode blocks and the tank shell, and spread the first electrolyte block to the same height as the artificial leg extension.
[0045] Specifically, the diameter of the first electrolyte block is 1-5cm, and the height of the first electrolyte block is 30-35cm. It should be noted that electrolyte blocks are not required at the four corners of the electrolytic cell cavity in step 110. Multiple sets of anode blocks are installed inside the aluminum electrolytic cell, specifically two anode blocks. × There are 16 blocks, where 2 is the number of columns and 16 is the number of rows. The center seam is located between two columns of anode blocks, and the gap seam is located between the rows of anode blocks. The cathode carbon block surfaces on both sides of the multiple sets of anode blocks parallel to the center seam are located outside the anode blocks and between the artificial extension legs.
[0046] Step 120: Lay the second electrolyte block on both sides of the aluminum outlet and the flue opening to form an isolation wall. The isolation wall is used to isolate the aluminum outlet and the flue opening from the filler located at the four corners of the electrolytic cell cavity.
[0047] Specifically, the diameter of the second electrolyte block is 10-15cm. The second electrolyte blocks used on both sides of the aluminum outlet and flue opening are relatively regular in shape and stacked to form an electrolyte wall with a width of 20-30cm. This electrolyte wall isolates the aluminum outlet and flue opening from the four corners of the electrolytic cell cavity, so that the four corners of the electrolytic cell cavity form a semi-cavity structure. Furthermore, during the roasting process, the electrolyte wall can prevent materials from entering the four corners of the electrolytic cell cavity, thereby affecting the temperature rise at the four corners.
[0048] Step 130: Evenly spread the first cryolite in the second target area, wherein the second target area includes the central seam area, the areas on both sides of multiple sets of anode blocks parallel to the central seam area, and the four corners of the electrolytic cell cavity, and spread the first cryolite to cover the surface of the first electrolyte block and the artificial leg extension.
[0049] Specifically, the first cryolite weighs 5 tons and is in powder form. In the central seam area, the first cryolite needs to be laid to cover the first electrolyte block and fill the gaps between the electrolyte blocks. In the areas on both sides of the multiple sets of anode blocks parallel to the central seam, the first cryolite needs to be laid to cover the first electrolyte and fill the gaps between the electrolyte blocks. In the four corner areas of the electrolytic cell cavity, the first cryolite needs to be laid to cover the artificial extension legs. In the central seam area and the areas on both sides of the multiple sets of anode blocks parallel to the central seam, the first cryolite needs to be laid at a height of 38-40 cm from the surface of the cathode carbon block. In the four corner areas of the electrolytic cell cavity, the first cryolite needs to be laid at a height of 20-25 cm from the surface of the cathode carbon block.
[0050] Step 140: Place the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, wherein the four corner anodes include anode blocks located at the four corners of multiple sets of anode blocks.
[0051] Specifically, the baffle plate can be made of aluminum plate, but in actual work, other materials can also be selected as the baffle plate. The anodes at the four corners of the tank can be anode blocks numbered A1, B1, A16, and B16. The side bricks are set on the inside of the tank shell.
[0052] Optionally, in addition to the isolation walls laid on both sides of the aluminum outlet end, multiple sets of isolation walls can be laid sequentially between the filler at the four corners of the electrolytic cell cavity and the aluminum outlet end / flue opening. Isolation walls can also be laid on the outside of the anode at the four corners of the cell according to the actual situation. In addition to isolating the four corners of the electrolytic cell cavity from the aluminum outlet end / flue opening, these isolation walls can also serve to support the baffle plate.
[0053] Step 150: Lay the covering material on the plane formed by the central seam area and the top of the multiple sets of anode blocks and the top of the tank shell. The baffle plate is used to isolate the four corners of the electrolytic cell cavity from the covering material.
[0054] Specifically, the covering material includes a third electrolyte block and a second cryolite. The laying sequence of the covering material is as follows: first, the third electrolyte block, weighing 6 tons ± 60 kg, is spread on the central seam area and the plane formed by the tops of multiple anode blocks and the top of the tank shell. After the third electrolyte block is evenly spread, the second cryolite, weighing 8 tons ± 80 kg, is laid on top of the third electrolyte block. It can be understood that electrolyte walls are built on both sides of the aluminum outlet and the flue opening, and the filling material covers the artificial extension legs. The filling material at the four corners of the electrolytic cell cavity includes, but is not limited to, cryolite. Baffle plates are placed between the outer edges of the corner anodes and the edges of the side bricks, thus forming semi-cavities at the four corners of the electrolytic cell cavity, with a height of approximately 18-22 cm. Because the temperature in the central seam of the aluminum electrolytic cell cavity is high, the four corners of the electrolytic cell cavity heat up slowly due to their location in the heat dissipation area. The semi-cavity structure at the four corners of the electrolytic cell cavity in this embodiment avoids the oxidation of the cathode carbon blocks and the problem of surface bursting during heating. Furthermore, the semi-cavity structure ensures a minimal temperature difference between the four corners and the center of the electrolytic cell during roasting, resolving the issues of insufficient initial temperature and sudden temperature increases later in the roasting process. This results in a more uniform heating gradient and a more uniform anolyte current distribution during the roasting process, achieving uniform roasting and a highly efficient and stable electrolytic cell. The filler material melts into a liquid state during roasting, forming a solid cavity filling the aluminum electrolytic cell. The sufficient amount of filler material protects the cathode carbon blocks and artificial extension legs after melting, ensuring they are completely immersed in the liquid electrolyte and preventing contact with air, thus protecting them.
[0055] In an exemplary embodiment, before the step of laying the second electrolyte block on both sides of the aluminum outlet and the isolation wall formed on both sides of the flue opening, the method for loading the prebaked anode aluminum electrolytic cell further includes:
[0056] Calcium fluoride is evenly spread around the perimeter of the electrolytic cell cavity, with a weight of 200-300 kg. The weight of calcium fluoride added is calculated based on the calcium content in the electrolyte.
[0057] In one exemplary embodiment, prior to the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for charging the prebaked anode aluminum electrolytic cell further includes:
[0058] Soda ash is laid on top of the first cryolite, and the filling material at the four corners of the electrolytic cell cavity includes, but is not limited to, the first cryolite and soda ash.
[0059] In one exemplary embodiment, prior to the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for charging the prebaked anode aluminum electrolytic cell further includes:
[0060] Use first-grade rock wool to seal the gaps between multiple sets of anode blocks;
[0061] Specifically, unlike the anode block seams located horizontally between anode blocks, the anode block inter-seams are located vertically between anode blocks. Each piece of rock wool is cut to a width of 5-8 cm, with a length consistent with the electrolyte block. Multiple sets of anode block inter-seams are sealed with the first set of rock wool to prevent the covering material from entering the inter-seams. In other words, if the inter-seams are not sealed, the material on the covering material will flow into the inter-seams. As the temperature rises during roasting, the covering material solidifies, causing adjacent sets of anode blocks to stick together. Because the anode blocks expand during roasting, they will experience slight vertical movement. If adjacent sets of anode blocks stick together, it hinders the free thermal expansion of the bottom of the anode blocks, thus affecting the current distribution within the electrolytic cell.
[0062] Before the step of laying the covering material on the plane formed by the top of the multiple sets of anode blocks and the top of the tank shell, the charging method of the prebaked anode aluminum electrolytic cell further includes:
[0063] The second rock wool is used to fill the gap between the baffle plate and the anode frame.
[0064] The following is combined Figures 1-5 The specific processing steps are explained below:
[0065] Example 1
[0066] Step 1: After the lining of the 4081# aluminum electrolytic cell is completed, install anode block 1, clean the furnace and surrounding debris, and use compressed air to blow away dust from the cathode carbon block and the surface of the artificial extension leg.
[0067] Step 2: Evenly lay broken electrolyte blocks with a diameter of 1-5cm and a height of 30-32cm on the surface of the cathode carbon block on the AB side, the surface of the artificial extension leg, and the surface of the cathode carbon block in the middle seam. Do not lay electrolyte blocks at the four corners of the electrolytic cell cavity. The AB side includes the A side and the B side. The A side and the B side refer to the planes between the two sides of the multiple sets of anode blocks and the cell shell.
[0068] Step 3: Evenly spread approximately 200 kg of calcium fluoride around the perimeter of the electrolytic cell.
[0069] Step 4: Use electrolyte blocks with a diameter of 20-30cm 2 to surround the aluminum outlet end 3 and both sides of the flue opening, so that the aluminum outlet end, the flue opening and the four corners of the electrolytic cell cavity are isolated;
[0070] Step 5: Use approximately 5 tons of cryolite to evenly spread on the AB surface, the central seam, and the four corners of the electrolytic cell cavity. The central seam and AB surface must cover the electrolyte block, and the four corners of the electrolytic cell cavity must cover the extension leg surface; use 2 tons of soda ash to spread on top of the cryolite on the AB surface.
[0071] Step 6: Seal the gaps between the anode blocks with rock wool;
[0072] Step 7: Use aluminum baffles with a thickness of 1-2mm to place between the anode edges and the side brick edges at the four corners of the cell. The baffles will isolate the four corners of the electrolytic cell cavity from the upper covering material, so that the inside of the four corners of the electrolytic cell and the surrounding area form a flowable cavity channel.
[0073] Step 8: Cut the rock wool and lay it on top of the aluminum baffle plate so that it can cover the gap between the aluminum baffle plate and the anode block;
[0074] Step 9: Spread 60 tons ± 60 kg of crushed electrolyte blocks on the baffle plate, the middle seam, and the AB side of the electrolytic cell. After spreading the crushed electrolyte blocks evenly, spread 8 tons ± 80 kg of cryolite on top of the crushed electrolyte blocks.
[0075] Table 1 shows the anode current distribution during the roasting of cell 4081#. As can be seen from Table 1, by measuring the anode current distribution of 16 groups on both sides of surface A and B at the same time point during the roasting process of cell 4081# for four days, it can be shown that the charging method of the prebaked anode aluminum electrolytic cell in this application embodiment has a uniform anode current distribution and no bias current phenomenon with excessively high single anode current distribution occurs.
[0076] Table 1
[0077]
[0078] Figure 2 This is a graph showing the average temperature rise at the four corners of the 4081# calcination tank according to an embodiment of this application. Figure 3This is a temperature rise curve of the average temperature of the calcination seam in the 4081# blast furnace provided in one embodiment of this application. Figure 4 This is a temperature rise curve of the average temperature of the AB side of the 4081# calcination tank provided in an embodiment of this application. Figure 5 The average temperature rise curve of the 4081# calcination tank provided in one embodiment of this application. Figures 2-5 The horizontal and vertical axes in the figure represent the roasting temperature measured every 4 hours over four days of roasting in the electrolytic cell. Figure 2 The horizontal axis represents the average temperature of the four corners during roasting. Figure 3 The horizontal axis represents the average temperature of the center seam during roasting. Figure 4 This indicates the average temperature of surfaces A and B during roasting. Figure 5 This represents the overall average temperature at nine random measurement points within the electrolytic cell during roasting. Four points are taken at the four corners of the electrolytic cell cavity, three points are taken at the center seam, and one point is taken from surface A and one from surface B respectively. From... Figures 2-5 As can be seen, the prebaked anode aluminum electrolytic cell loading method provided in this application, through the method of loading into the solid cavity and the semi-empty cavities at the four corners of the electrolytic cell, enables the four corners of the electrolytic cell to heat up quickly, solving the problem of low corner temperatures in the original technology. Because the solid cavity loading contains sufficient liquid electrolyte, its conductivity makes the temperature rise curve smooth, solving the problem of insufficient initial temperature and sudden temperature increase at the later stage of the central seam and AB surface in the original technology.
[0079] Example 2
[0080] Step 1: After the lining of the 5111# aluminum electrolytic cell is completed, install anode block 1, clean the furnace and surrounding debris, and use compressed air to blow away dust from the cathode carbon block and the surface of the artificial extension leg.
[0081] Step 2: Evenly lay broken electrolyte blocks with a diameter of 1-5cm and a height of 32-35cm on the surface of the cathode carbon block on the AB side, the surface of the artificial extension leg, and the surface of the cathode carbon block in the middle seam. No electrolyte blocks are laid at the four corners of the electrolytic cell cavity. The AB side includes the A side and the B side. The A side and the B side refer to the planes between the two sides of the multiple sets of anode blocks and the cell shell.
[0082] Step 3: Evenly spread approximately 200 kg of calcium fluoride around the perimeter of the electrolytic cell.
[0083] Step 4: Use electrolyte blocks with a diameter of 10-15cm 2 to block the aluminum outlet 3 and both sides of the flue opening, and stack them to form an electrolyte wall with a width of 20-30cm, so that the aluminum outlet, flue opening and the four corners of the electrolytic cell cavity are isolated.
[0084] Step 5: Use approximately 5 tons of cryolite to evenly spread on the AB surface, the central seam, and the four corners of the electrolytic cell cavity. The central seam and AB surface must cover the electrolyte block, and the four corners of the electrolytic cell cavity must cover the extension leg surface; use 2 tons of soda ash to spread on top of the cryolite on the AB surface.
[0085] Step 6: Seal the gaps between the anode blocks with rock wool;
[0086] Step 7: Use aluminum baffles with a thickness of 1-2mm to place between the anode edges and the side brick edges at the four corners of the cell. The baffles will isolate the four corners of the electrolytic cell cavity from the upper covering material, so that the inside of the four corners of the electrolytic cell and the surrounding area form a flowable cavity channel.
[0087] Step 8: Cut the rock wool and lay it on top of the aluminum baffle plate so that it can cover the gap between the aluminum baffle plate and the anode block;
[0088] Step 9: Spread 60 tons ± 60 kg of crushed electrolyte blocks on the baffle plate, the middle seam, and the AB side of the electrolytic cell. After spreading the crushed electrolyte blocks evenly, spread 8 tons ± 80 kg of cryolite on top of the crushed electrolyte blocks.
[0089] Table 2 shows the anode current distribution during the roasting of cell 5111#. As can be seen from Table 2, by measuring the anode current distribution of 16 groups on both sides of surface A and B at the same time point during the roasting process of cell 5111# for four days, it can be shown that the furnace loading method of the prebaked anode aluminum electrolysis cell in this application embodiment has a uniform anode current distribution and no bias current phenomenon of excessively high single anode current distribution occurs.
[0090] Table 2
[0091]
[0092]
[0093] Figure 6 This is a temperature rise curve of the four corners of the 5111# calcination tank provided in an embodiment of this application. Figure 7 This is a temperature rise curve of the average seam in the 5111# calcination tank provided in an embodiment of this application. Figure 8 This is a temperature rise curve of the average temperature of the AB side of the 5111# calcination tank provided in an embodiment of this application. Figure 9 The average temperature rise curve of the 5111# calcination tank provided in an embodiment of this application is shown. Figures 6-9 The horizontal and vertical axes in the figure represent the roasting temperature measured every 4 hours over four days of roasting in the electrolytic cell. Figure 6 The horizontal axis represents the average temperature of the four corners during roasting. Figure 7 The horizontal axis represents the average temperature of the center seam during roasting. Figure 8 This indicates the average temperature of surfaces A and B during roasting. Figure 9This represents the overall average temperature at nine random measurement points within the electrolytic cell during roasting. Four points are taken at the four corners of the electrolytic cell cavity, three points are taken at the center seam, and one point is taken from surface A and one from surface B respectively. From... Figures 6-9 As can be seen, the prebaked anode aluminum electrolytic cell loading method provided in this application, through the method of loading into the solid cavity and the semi-empty cavities at the four corners of the electrolytic cell, enables the four corners of the electrolytic cell to heat up quickly, solving the problem of low corner temperatures in the original technology. Because the solid cavity loading contains sufficient liquid electrolyte, its conductivity makes the temperature rise curve smooth, solving the problem of insufficient initial temperature and sudden temperature increase at the later stage of the central seam and AB surface in the original technology.
[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.
[0095] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A method for charging a prebaked anode aluminum electrolytic cell, characterized in that, The aluminum electrolytic cell includes an electrolytic cell cavity, the bottom of which is lined with cathode carbon blocks, and multiple sets of anode blocks are disposed on top of the cathode carbon blocks. The method for loading the prebaked anode aluminum electrolytic cell includes: The first electrolyte block is evenly laid on the surface of the artificial leg extension and the first target area, wherein the first target area includes the surface of the cathode carbon block located in the middle seam area, and the surfaces of the cathode carbon blocks on both sides of the multiple sets of anode blocks parallel to the middle seam area. The first electrolyte block is laid at the same height as the artificial leg extension. The second electrolyte block is laid on both sides of the aluminum outlet and both sides of the flue opening to form an isolation wall. The isolation wall is used to isolate the aluminum outlet and the flue opening from the filler located at the four corners of the electrolytic cell cavity. The first cryostone is evenly spread in the second target area, wherein the second target area includes the central seam area, the areas on both sides of the multiple sets of anode blocks parallel to the central seam, and the four corners of the electrolytic cell cavity. The first cryostone is spread to the position that covers the first electrolyte block and the surface of the artificial leg extension. The baffle plate is placed between the outer edge of the four corner anodes and the edge of the side bricks, wherein the four corner anodes include anode blocks located at the four corners of the multiple sets of anode blocks; The covering material is laid on the plane formed by the central seam area, the top of the multiple sets of anode blocks, and the top of the tank shell. The baffle plate is used to isolate the four corners of the electrolytic cell cavity from the covering material.
2. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, Before the step of laying the second electrolyte block on both sides of the aluminum outlet end and the isolation wall formed on both sides of the flue opening, the charging method of the prebaked anode aluminum electrolytic cell further includes: Calcium fluoride is evenly spread around the perimeter of the electrolytic cell cavity.
3. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, Before the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for loading the prebaked anode aluminum electrolytic cell further includes: Soda ash is laid on top of the first cryolite.
4. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, Before the step of placing the baffle plate between the outer edge of the four corner anodes and the edge of the side bricks, the method for loading the prebaked anode aluminum electrolytic cell further includes: The gaps between the multiple sets of anode blocks were sealed with first-grade rock wool. Before the step of laying the covering material on the plane formed by the top of the multiple sets of anode blocks and the top of the tank shell, the charging method of the prebaked anode aluminum electrolytic cell further includes: The second rock wool is used to fill the gap between the baffle plate and the anode frame.
5. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The covering material includes a third electrolyte block and a second cryolite, and the laying sequence of the covering material is as follows: First, lay the third electrolyte block, and then lay the second cryolite on top of the third electrolyte block.
6. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The diameter of the first electrolyte block is 1-5cm; the laying height of the first electrolyte block is 30-35cm; and the diameter of the second electrolyte block is 20-30cm.
7. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The weight of the first cryolite is 5 tons ± 0.5 kg. In the central region and the region on both sides of the multiple sets of anode blocks parallel to the central seam, the first cryolite is laid at a height of 38-40 cm from the surface of the cathode carbon block. In the four corner regions of the electrolytic cell cavity, the first cryolite is laid at a height of 20-25 cm from the surface of the cathode carbon block.
8. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The weight of the third electrolyte block is 6 tons ± 60 kg, the thickness of the third electrolyte block is 90-100 mm, and the diameter of the third electrolyte block is 10-20 mm.
9. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The second layer of cryolite is 90-110cm thick.
10. The method for charging a prebaked anode aluminum electrolytic cell according to claim 1, characterized in that, The calcium fluoride weighs 200-300 kg.