Anode carbon block for aluminum reduction cells

Abstract

The application provides an anode carbon block for an aluminum electrolytic cell, which comprises an anode carbon block body, a steel claw assembly and an anode guide rod; the anode carbon block body is square as a whole and is provided with a protrusion at the upper portion; the steel claw assembly comprises a plurality of steel claws which are arranged in parallel and are connected perpendicularly to the anode guide rod; a carbon bowl corresponding to the number of the steel claws is formed in the protrusion; the lower end of each steel claw is provided with a plug-in part and is plugged into each carbon bowl respectively; a circular limiting step protruding upward is arranged at the middle position of the inner bottom wall of the carbon bowl; a clamping groove is formed in the middle position of the lower end surface of the plug-in part of the steel claw; the lower end of the plug-in part of the steel claw has a step surface; a first carbon ring which is in contact with the step surface is sleeved on the outside of the lower end of the plug-in part; and the outer ring surface of the first carbon ring and the inner side wall of the carbon bowl are bonded by carbon cement. The anode carbon block of the application can keep a good plug-in posture and a good conductive contact state of the steel claw during operation by the combined cooperation of plug-in limiting, cementing buffering and multi-point constraint, and is more stable and reliable in use.

Description

Technical Field

[0001] This application relates to the field of aluminum electrolysis technology, and in particular to an anode carbon block for an aluminum electrolysis cell. Background Technology

[0002] As the mainstream production method in the current aluminum electrolysis industry, the anode system structure has a significant impact on the overall cell operation stability, energy conversion efficiency, and anode replacement cycle. As a crucial component of the anode system, the anode carbon block primarily functions to conduct electricity, support the anode conductors, and transmit the reaction current. Operating in a high-temperature, high-current environment for extended periods, it places extremely high demands on the structural reliability and the stability of its conductive connections. With the development of large-scale electrolytic cells and high-current-density technologies, the structural design of the anode carbon block has gradually become one of the key factors determining the performance of the electrolysis system.

[0003] Existing anode carbon blocks and steel claws are mostly connected via a plug-in method. The lower end of the steel claw is usually embedded in a hole inside the carbon block body, and a mating connection is formed by the clamping force between the contact surfaces. Some designs also add additional components at certain locations on the carbon block to improve the connection strength. While this type of structure can meet basic operational requirements, it often struggles to cope with complex conditions such as thermal expansion stress at high temperatures, tank current surges, and mechanical disturbances in practical applications. This can lead to problems such as loosening of the gap and poor contact between the anode carbon block and the steel claw, which in turn affects the anode conductivity and may even cause operational failures.

[0004] A long-standing technical challenge in this field is how to effectively suppress the unstable connection and loosening of the anode carbon block and steel claws caused by thermal shock without changing the overall structure of the electrolytic cell, thereby improving the axial stability and conductive contact reliability of the connection structure. This application is proposed based on this situation. Utility Model Content

[0005] This application provides an anode carbon block for aluminum electrolysis cells to solve the problem of poor insertion stability of the anode carbon block and steel claw connection structure under high temperature conditions in the prior art.

[0006] This application provides an anode carbon block for an aluminum electrolysis cell, including an anode carbon block body, a steel claw assembly, and an anode guide rod;

[0007] The anode carbon block body is generally square with a protrusion on the upper part. The steel claw assembly includes multiple parallel steel claws that are perpendicularly connected to the anode guide rod. The protrusion has a carbon bowl corresponding to the number of steel claws. The lower end of each steel claw has an insertion part that is inserted into the carbon bowl. The inner bottom wall of the carbon bowl has a circular limiting step that protrudes upward and abuts against the lower end face of the steel claw. The steel claw has a snap-fit ​​groove that matches the circular limiting step at the lower end face of the insertion part. The steel claw has a stepped surface at the lower end of the insertion part. A first carbon ring that contacts the stepped surface is sleeved on the outer side of the lower end of the insertion part. The outer ring surface of the first carbon ring is bonded to the inner side wall of the carbon bowl with carbon putty.

[0008] In one optional embodiment, the protrusion is integrally formed from four consecutively arranged frustum protrusions, each having a cylindrical insertion groove, and the connection between the four frustum protrusions is an arc transition; the number of charcoal bowls is four, respectively disposed on the four frustum protrusions, and each charcoal bowl has an anti-detachment groove on its inner sidewall.

[0009] In one alternative embodiment, the anode carbon block body is formed by pressing prebaked anodes.

[0010] In one alternative embodiment, a second carbon ring is bonded and fixed to the outer side of the opening of each of the carbon bowls by carbon putty, and the second carbon ring is also fitted onto the steel claw.

[0011] In one alternative embodiment, both the first carbon ring and the second carbon ring are made of the same material as the anode carbon block body.

[0012] In one alternative embodiment, the steel claw is made of alloy steel and has a rod-shaped structure.

[0013] In one alternative embodiment, the steel claw is connected to the anode guide rod by welding or bolting.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. This application provides an anode carbon block for aluminum electrolysis cells, which enhances the axial fit between the steel claws and the anode carbon block body under high-temperature conditions. The anode carbon block body has multiple carbon cups on its protruding parts, the number of which corresponds one-to-one with the steel claws. The insertion part of each steel claw is inserted into the corresponding carbon cup from top to bottom, forming an insertion fit. The carbon cups structurally provide dedicated conductive channels for the steel claws, and the steel claws are rationally distributed along the anode carbon block body. This structural arrangement effectively disperses the heat load and current path, reducing the risk of steel claw loosening caused by uneven thermal stress or local load shifts, making the conductive components more stable under operating conditions.

[0016] 2. This application constructs a locking and fitting structure with a limiting function by setting an upwardly protruding circular limiting step on the inner bottom wall of the carbon bowl and opening a snap-fit ​​groove in the middle of the insertion end face of the steel claw. When the steel claw is inserted to the bottom of the carbon bowl, its snap-fit ​​groove and the limiting step form a circumferential contact, providing a certain radial support for the insertion part of the steel claw, which helps to limit the lateral swaying or displacement tendency of the steel claw in the insertion channel. Since the limiting step is directly set on the inner bottom wall of the carbon bowl, it itself is part of the carbon aggregate to achieve nesting with the steel claw, which not only improves the structural stability of the insertion connection, but also avoids the introduction of additional components and simplifies the manufacturing process. Moreover, in the high-temperature electrolysis operating environment, this locking structure has a positive effect on enhancing the insertion stability, reducing the risk of radial loosening caused by thermal stress or equipment vibration, and further improving the operational reliability of the anode system.

[0017] 3. This application provides a first carbon ring on the outer side of the stepped surface at the lower end of the steel claw insertion part. This first carbon ring is bonded to the inner wall of the carbon bowl using carbon putty. The first carbon ring structurally fits the steel claw and forms a circumferential constraint interface on the side wall of the carbon bowl, providing a certain buffering performance. The bonded carbon putty acts as a filler layer, absorbing local stress caused by differences in thermal expansion during operation, while suppressing the transmission of micro-vibrations, thereby improving the bonding stability of the insertion part. The anode carbon block for the aluminum electrolytic cell of this application, through a composite combination of insertion limiting, bonding buffer, and multi-point constraint, enables the steel claw to maintain a good insertion posture and conductive contact state during operation, thus meeting the engineering requirements for long-term stable operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an anode carbon block for an aluminum electrolytic cell provided in one embodiment of this application;

[0020] Figure 2 This is a schematic diagram showing the connection between the steel claw assembly and the anode guide rod according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the anode carbon block body provided in one embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the interior of a charcoal bowl provided in one embodiment of this application;

[0023] Figure 5 This is a schematic diagram showing the connection between the charcoal bowl and the steel claw according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100-Anode carbon block body; 200-Steel claw assembly; 210-Steel claw; 2101-Insertion part; 211-Snap-fit ​​groove; 212-Stepped surface; 300-Anode guide rod; 400-Protrusion; 410-Frustum protrusion; 500-Carbon bowl; 510-Anti-detachment groove; 600-Circular limiting step; 700-First carbon ring; 800-Second carbon ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Please see Figures 1-5 , Figure 1 This is a schematic diagram of the structure of an anode carbon block for an aluminum electrolytic cell provided in one embodiment of this application; Figure 2 This is a schematic diagram showing the connection between the steel claw assembly and the anode guide rod according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the anode carbon block body provided in one embodiment of this application; Figure 4 This is a schematic diagram of the interior of a charcoal bowl provided in one embodiment of this application; Figure 5 This is a schematic diagram illustrating the connection between the charcoal bowl and the steel claw according to an embodiment of this application. Figures 1-5 As shown in the figure, this application provides an anode carbon block for an aluminum electrolysis cell, including an anode carbon block body 100, a steel claw assembly 200, and an anode guide rod 300.

[0031] The anode carbon block body 100 is generally square and has a protrusion 400 on the top. The steel claw assembly 200 includes multiple parallel steel claws 210 that are perpendicularly connected to the anode guide rod 300. The protrusion 400 has carbon bowls 500 corresponding to the number of steel claws 210. The lower end of each steel claw 210 is provided with an insertion part 2101 and is inserted into the carbon bowl 500 respectively. The inner bottom wall of the carbon bowl 500 is provided with a facet for abutting against the lower end of the steel claw 210. The upward-protruding circular limiting step 600 is connected to the steel claw 210, which has a snap-fit ​​groove 211 at the middle of the lower end face of the insertion part 2101 that matches the circular limiting step 600. The steel claw 210 has a stepped surface 212 at the lower end of the insertion part 2101. A first carbon ring 700 that contacts the stepped surface 212 is sleeved on the outer side of the lower end of the insertion part 2101. The outer ring surface of the first carbon ring 700 is bonded to the inner side wall of the carbon bowl 500 by carbon putty.

[0032] To enhance the axial fit between the steel claw 210 and the anode carbon block body 100 under high-temperature conditions, this embodiment provides multiple carbon cups 500 on the protrusion 400 of the anode carbon block body 100, with the number corresponding to the number of steel claws 210. The insertion part 2101 of each steel claw 210 is inserted into the corresponding carbon cup 500 from top to bottom, forming an insertion fit relationship. The carbon cup 500 provides a dedicated conductive channel for the steel claw 210. The steel claws 210 are reasonably distributed along the anode carbon block body 100. This structural arrangement can effectively disperse the heat load and current path, reduce the risk of steel claw loosening caused by uneven thermal stress or local load shift, and make the conductive components more stable under working conditions.

[0033] Based on this, this embodiment constructs a fitting structure with a limiting function by setting an upwardly protruding circular limiting step 600 on the inner bottom wall of the carbon bowl 500 and opening a locking groove 211 in the middle of the end face of the insertion part 2101 of the steel claw 210. When the steel claw 210 is inserted into the bottom of the carbon bowl 500, its locking groove 211 and the limiting step 600 form a circumferential fit contact, which provides a certain radial support for the insertion part of the steel claw in terms of structure, and helps to limit the lateral swaying or displacement tendency of the steel claw in the insertion channel. Since the limiting step 600 is directly set on the inner bottom wall of the carbon bowl 500, it itself is part of the carbon aggregate to achieve nesting fit with the steel claw 210, which not only improves the structural stability of the insertion connection, but also avoids the introduction of additional components and simplifies the manufacturing process. Moreover, in the high-temperature electrolysis operating environment, this fitting structure has a positive effect on enhancing the insertion stability, which can reduce the risk of radial loosening caused by thermal stress or equipment vibration, and further improve the operational reliability of the anode system.

[0034] Furthermore, to further enhance the stability of the insertion part, in this embodiment, a first carbon ring 700 is provided on the outer side of the stepped surface 212 at the lower end of the insertion part 2101 of the steel claw 210. This first carbon ring 700 is bonded to the inner wall of the carbon bowl 500 by carbon putty. The first carbon ring 700 is structurally fitted to the steel claw 210 and forms a circumferential constraint interface on the side wall of the carbon bowl 500, providing a certain buffering performance. The bonded carbon putty can act as a filling layer, absorbing local stress caused by differences in thermal expansion during operation, while suppressing the transmission of micro-vibrations, thereby improving the fit stability of the insertion part.

[0035] As can be seen from the above, the anode carbon block used in the aluminum electrolysis cell of this embodiment, through the combined cooperation of insertion limit, adhesive buffer and multi-point constraint, enables the steel claw 210 to maintain a good insertion posture and conductive contact state during operation, thereby meeting the engineering requirements for long-term stable operation.

[0036] In some embodiments, the protrusion 400 is integrally formed by four frustum protrusions 410 that are continuously arranged and each has a cylindrical insertion groove, and the connection of the four frustum protrusions 410 adopts an arc transition; there are four charcoal bowls 500, which are respectively arranged on the four frustum protrusions 410, and each charcoal bowl 500 has an anti-detachment groove 510 on its inner sidewall.

[0037] In the above embodiments, based on the interlocking fit between the steel claw 210 and the anode carbon block body 100, the upper structure of the anode carbon block body 100 is further optimized and adjusted. The protrusion 400 is designed to be integrally formed by four continuously arranged frustum protrusions 410, with arc-shaped transition connections between each frustum protrusion 410. This helps to improve the geometric continuity of the overall structure, reduce stress concentration caused by abrupt boundary changes, and thus give it stronger structural adaptability under heating or stress conditions, reducing the possibility of cracking or local damage at the edge of the carbon cup.

[0038] Each frustum protrusion 410 is provided with a cylindrical insertion slot for accommodating the carbon bowl 500, which not only provides a clear position for the carbon bowl but also ensures that the insertion direction of the steel claws 210 remains consistent. The four carbon bowls 500 are evenly arranged on the carbon block body 100, making the spatial distribution of the steel claws 210 more balanced. This helps to make the conductive path distribution more reasonable, reducing current deviation or local overheating problems caused by uneven local conductivity, thereby making the electrolytic cell more stable during long-term operation.

[0039] In addition, an anti-detachment groove 510 is added to the inner wall of the carbon bowl 500. Through the reasonable design of the structural details of the carbon bowl 500 itself, this structure provides a relatively effective limiting assistance for the insertion part of the steel claw 210 without introducing additional components. When the system is in a high-temperature environment or when performing insertion and removal operations, this structure can locally restrict the axial position of the steel claw 210 in the carbon bowl 500, reducing the risk of the steel claw 210 loosening, slipping, or shifting.

[0040] In some embodiments, the anode carbon block body 100 is formed by pressing prebaked anode process.

[0041] In this embodiment, the anode carbon block body 100 is formed by prebaked anode pressing. This process involves high-temperature baking during the forming stage, resulting in a tighter bond between carbon particles and the release of volatile components, thus obtaining a carbon product with higher density and lower porosity. The resulting anode carbon block body 100 exhibits good dimensional stability and structural strength when exposed to high temperatures and strong currents, helping to reduce the risk of loss due to thermal shock and electrolyte erosion. Furthermore, the dense material structure not only improves overall conductivity uniformity but also provides a more stable support contact interface in the insertion area of ​​the steel claw 210. During long-term operation of the electrolytic cell, significant deformation of the carbon block can lead to uneven stress at the insertion points and deviation of the conductive path. By using prebaked molding, the thermal expansion trend of the anode carbon block tends to be consistent, and the stress state between each insertion point is more coordinated, thereby reducing structural stress fluctuations caused by local strain accumulation.

[0042] Furthermore, the anode carbon blocks formed by the calcined anode process exhibit superior adaptability to carbon mortar. In the bonding layer formed between the first carbon ring 700 and the carbon bowl 500, this adaptability manifests as strong interfacial adhesion and thermal stability, maintaining the integrity of the bonding interface under thermal cycling loads. This not only enhances the bonding stability of the joints but also slows down the formation and propagation of microcracks, positively contributing to the long-term reliable operation of the anode assembly.

[0043] The anode carbon block body is typically prepared using a raw material system with high-quality petroleum coke as aggregate and coal tar pitch as binder, through a high-temperature roasting process, forming a carbon structure with high density, high electrical conductivity, good thermal stability, and strong mechanical strength. This type of prebaked anode material can effectively resist fluoride gas corrosion and anode effect impact during electrolytic cell operation, and is widely used in large-current-density aluminum electrolysis systems, possessing a mature application foundation and process adaptability.

[0044] In some embodiments, a second carbon ring 800 is bonded and fixed to the outside of the opening of each carbon bowl 500 by carbon putty, and the second carbon ring 800 is simultaneously sleeved on the steel claw 210.

[0045] Based on the aforementioned multi-point insertion and limiting structure, this embodiment adds a second carbon ring 800 to the outer side of the opening of the carbon cup 500 and fixes it with carbon putty. Simultaneously, the second carbon ring 800 and the outer surface of the steel claw 210 are fitted together, thus constructing a wraparound external auxiliary limiting structure. This structure forms a circumferential positioning boundary at the upper edge of the carbon cup 500, which helps to provide additional fixed support points for the steel claw 210 under conditions of high temperature fluctuations or equipment vibration, reducing insertion wobbling caused by thermal expansion or mechanical disturbance.

[0046] The first carbon ring 700 is located at the bottom inside the carbon cup 500, and the second carbon ring 800 is located at its opening. The two are arranged opposite each other, clamping each other from above and below, thus restricting the insertion point of the steel claw 210 from both axial and radial directions, ensuring sufficient restraint on the steel claw. This dual-point support arrangement optimizes the overall connection and also weakens the vibration transmission path to some extent, resulting in more uniform stress diffusion at the insertion interface. Furthermore, the second carbon ring 800 is bonded and fixed using carbon putty, rather than relying on a rigid mechanical structure, which facilitates later disassembly.

[0047] In some embodiments, the first carbon ring 700 and the second carbon ring 800 are both made of the same material as the anode carbon block body 100.

[0048] In this embodiment, both the first carbon ring 700 and the second carbon ring 800 are made of the same material as the anode carbon block body 100 to enhance the matching performance of each structure under high-temperature operating conditions. The anode carbon block body 100 is typically made of prebaked carbon material, which has stable physical properties in terms of thermal expansion, electrical conductivity, and corrosion resistance. Using the same material for the carbon ring components helps to maintain consistent thermal deformation during electrolytic cell start-up and shutdown and load fluctuations, thereby reducing local gaps or stress accumulation at the interface due to expansion differences.

[0049] Furthermore, during the bonding stage, the same carbon materials exhibit good interfacial affinity, resulting in more uniform spread of the carbon adhesive during filling and a more stable bond structure. This type of bonding is less prone to delamination or fatigue degradation under prolonged heating and electric field conditions, helping to slow down the aging process of the connected components and improve structural retention performance.

[0050] Especially under the long-term high-temperature and high-current operating conditions of the steel claw 210, the first carbon ring 700 and the second carbon ring 800, as auxiliary limiting components, maintain the consistency of thermal and mechanical properties with the anode carbon block body 100. This reduces the probability of sudden thermal stress changes at the insertion interface and helps maintain the stability of the overall insertion structure. Moreover, the design concept of uniform materials not only simplifies the manufacturing and spare parts management process of carbon parts, but also provides higher compatibility and reliability for anode replacement and maintenance.

[0051] In some embodiments, the steel claw 210 is made of alloy steel and has a rod-shaped structure.

[0052] In this embodiment, the steel claw 210 is designed as a rod-shaped structure. This rod has a regular cross-section and is made of alloy steel, which enhances its overall performance in terms of mechanical load-bearing capacity, current conduction, and thermal adaptability. The rod-shaped structure provides a more uniform stress distribution, allows for higher dimensional accuracy during processing, and facilitates a vertical arrangement with the anode guide rod 300 when inserted into the carbon cup 500.

[0053] In terms of material selection, alloy steel balances high yield strength with suitable electrical conductivity, making it better suited for long-term service under complex operating conditions in high-temperature, high-current-density electrolytic cell environments. Compared to ordinary carbon steel, alloy steel has a denser microstructure, stronger corrosion resistance, and is less prone to early fatigue cracking in electrolyte atmospheres or strongly reducing environments, thus significantly delaying failure time.

[0054] As a key conductive component connecting the anode guide rod and the anode carbon block, the steel claw must operate in a complex environment of high temperature, high current density, and chemical corrosion for extended periods during aluminum electrolysis. Therefore, it is recommended to use low-carbon alloy steel or cast steel to balance mechanical strength, heat deformation resistance, and electrical conductivity. These alloy steel materials exhibit good dimensional stability and oxidation resistance at high temperatures, effectively extending the service life of the steel claw in the electrolytic cell and ensuring the stability of the anode structure and the reliability of the conductive path.

[0055] In some embodiments, the steel claw 210 and the anode guide rod 300 are connected by welding or bolting.

[0056] Based on the steel claw 210 being vertically inserted into the anode carbon block body 100 as a connecting component and cooperating with the anode guide rod 300 to form a conductive path, this embodiment further employs welding or bolting connections between the steel claw 210 and the anode guide rod 300 to adapt to assembly and maintenance requirements under different working conditions. The two connection methods each have their own characteristics in terms of structural performance and application scenarios, allowing for flexible selection based on specific usage environments.

[0057] Welded connections offer strong integrity, forming a continuous metal-to-metal contact interface between the steel claw 210 and the anode guide rod 300. This reduces contact gaps, helps lower contact resistance, and improves current conduction efficiency. Furthermore, this connection method exhibits higher rigidity under thermal and mechanical loads, making it less prone to loosening due to vibration or thermal deformation, suitable for long-term stable aluminum electrolysis operations. Bolted connections, on the other hand, prioritize convenient on-site operation, facilitating rapid assembly or disassembly. They offer strong engineering adaptability in situations requiring partial damage to the guide rod or frequent replacements, enhancing the flexibility and efficiency of subsequent maintenance.

[0058] For anode conductors, which serve as the primary current carriers, aluminum or aluminum alloys are typically used to achieve both high conductivity and lightweight construction. Aluminum conductors can be connected to steel claws via welding, bolting, or dissimilar metal transition blocks to create a stable electrical connection. They also exhibit good resistance to electrolyte corrosion and high-temperature conductivity, making them a common material choice in aluminum electrolysis anode systems.

[0059] The usage process of the anode carbon block for the aluminum electrolytic cell in this application embodiment is as follows:

[0060] Before the anode carbon block is put into use, the steel claws 210 and the anode guide rods 300 are pre-assembled. According to the required electrolytic cell layout, the steel claws 210 are evenly arranged at the lower end of the anode guide rods 300 in the designed quantity and securely connected by welding or bolts. After completion, the entire steel claw-guide rod assembly is transported to the assembly station of the anode carbon block body 100, ready for insertion.

[0061] During insertion, each steel claw 210 is slowly inserted from top to bottom, aligning with the insertion slot of the carbon cup 500 on the upper part of the anode carbon block body 100. The insertion action must be kept vertical to avoid skewing, which could cause jamming or damage to the carbon block. As the insertion part 2101 of the steel claw 210 is gradually pressed down, its end locking groove 211 will form a nested engagement with the circular limiting step 600 at the bottom of the carbon cup 500, creating a stable radial limiting interface. At the same time, the first carbon ring 700 completes bonding and matching with the side wall of the carbon cup 500 during insertion, forming preliminary auxiliary support.

[0062] After all the steel claws are inserted, the second carbon ring 800 is installed on the outer side of the opening of the carbon cup 500. The second carbon ring 800 is fitted onto the outer surface of the corresponding steel claw 210, and its outer edge is bonded and fixed to the inner wall of the upper opening of the carbon cup 500 with carbon putty. This ensures that the steel claw 210 is clamped and restricted in both vertical directions by the ring structure, thus forming a bidirectional stable insertion restriction system. This operation can further improve the vibration resistance and thermal expansion deformation resistance of the insertion part under heated conditions.

[0063] After assembly, the entire anode assembly is hoisted into the anode frame of the electrolytic cell and connected to the main conductive structure of the electrolysis system, completing the installation. During operation, the carbon block body 100 maintains structural stability under strong current and high temperature. The insertion parts maintain good conductive contact under the support of multiple carbon rings and cemented filling. The carbon cup 500 and the limiting step 600 work together to suppress the tendency of the steel claw to sway under electromagnetic disturbances, reducing the occurrence of loosening or abnormal contact resistance.

[0064] During maintenance, if the anode carbon blocks or steel claws show signs of aging or wear, the disassembly method can be selected based on the site conditions. For welded steel claw-guide rod assemblies, the steel claws can be removed from the guide rods using heat cutting or mechanical separation. For bolted connections, separation can be completed simply by removing the bolts. Furthermore, since the carbon rings are installed using carbon putty, they can be easily removed after softening by heat, facilitating the replacement and reassembly of components such as carbon blocks and steel claws, thus improving equipment efficiency and maintenance convenience.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An anode carbon block for an aluminum electrolytic cell, characterized in that, It includes an anode carbon block body (100), a steel claw assembly (200), and an anode guide rod (300). The anode carbon block body (100) is generally square and has a protrusion (400) on the upper part. The steel claw assembly (200) includes a plurality of parallel steel claws (210) that are perpendicularly connected to the anode guide rod (300). The protrusion (400) has carbon bowls (500) corresponding to the number of steel claws (210). Each steel claw (210) has a plug-in part (2101) at its lower end and is plugged into each carbon bowl (500). The inner bottom wall of the carbon bowl (500) has a part for contacting the end face of the lower end of the steel claw (210) at the middle position. The steel claw (210) has a locking groove (211) at the middle of the lower end face of the insertion part (2101) that matches the circular limiting step (600). The steel claw (210) has a stepped surface (212) at the lower end of the insertion part (2101). A first carbon ring (700) that contacts the stepped surface (212) is sleeved on the outer side of the lower end of the insertion part (2101). The outer ring surface of the first carbon ring (700) is bonded to the inner wall of the carbon bowl (500) by carbon putty.

2. The anode carbon block for an aluminum electrolytic cell according to claim 1, characterized in that, The protrusion (400) is integrally formed by four frustum protrusions (410) that are continuously arranged and each has a cylindrical insertion groove. The connection of the four frustum protrusions (410) adopts an arc transition. There are four charcoal bowls (500), which are respectively arranged on the four frustum protrusions (410), and each charcoal bowl (500) has an anti-detachment groove (510) on its inner sidewall.

3. The anode carbon block for an aluminum electrolytic cell according to claim 1, characterized in that, The anode carbon block body (100) is formed by pressing using a prebaked anode process.

4. The anode carbon block for an aluminum electrolytic cell according to any one of claims 1-3, characterized in that, Each of the charcoal bowls (500) has a second charcoal ring (800) bonded and fixed to the outside of its opening by charcoal putty, and the second charcoal ring (800) is also fitted onto the steel claw (210).

5. The anode carbon block for an aluminum electrolytic cell according to claim 4, characterized in that, The first carbon ring (700) and the second carbon ring (800) are both made of the same material as the anode carbon block body (100).

6. The anode carbon block for an aluminum electrolytic cell according to claim 1, characterized in that, The steel claw (210) is made of alloy steel and has a rod-shaped structure.

7. The anode carbon block for an aluminum electrolytic cell according to claim 1, characterized in that, The steel claw (210) and the anode guide rod (300) are connected by welding or bolting.

Images