Electrolytic aluminum anode structure based on silver electroplating spiral phosphorus pig iron connection and manufacturing method

Abstract

The invention discloses an electrolytic aluminum anode structure based on silver electroplating spiral phosphorus pig iron connection and a manufacturing method, the electrolytic aluminum anode structure comprises an anode carbon block, the anode carbon block is provided with a plurality of carbon bowls, and each carbon bowl is internally provided with an inner spiral groove; the carbon bowl further comprises an anode steel claw assembly, the anode steel claw assembly is provided with a plurality of steel claw teeth, one end of each steel claw tooth is provided with phosphorus pig iron, the phosphorus pig iron is connected with the carbon bowl, the periphery of the phosphorus pig iron is provided with an outer spiral groove matched with the inner spiral groove, and the surface of the phosphorus pig iron is further provided with a silver electroplating layer. According to the electrolytic aluminum anode structure, through the arrangement of the inner spiral groove and the outer spiral groove, the phosphorus pig iron and the carbon bowl can be well connected, so that the contact area of the phosphorus pig iron and the carbon bowl is remarkably increased, and the problem of loose connection caused by factors such as vibration in the electrolytic aluminum production process is effectively solved; and the voltage drop generated by current passing is also effectively reduced, and the conductive effect is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic aluminum equipment, and in particular to an electrolytic aluminum anode structure based on electroplated silver spiral phosphorus pig iron connection and a manufacturing method thereof. Background Art

[0002] The high cost caused by power consumption has always been a major problem that plagues aluminum electrolytic enterprises. The aluminum electrolytic industry has been committed to exploring and promoting methods and technologies with low power consumption. Among them, phosphorus pig iron casting anode assembly technology has obvious effects and has been widely recognized in the industry. The aluminum electrolytic anode assembled by this technology is mainly composed of aluminum guide rods, steel claws, phosphorus pig iron and anode carbon blocks. The steel claws and carbon blocks are bonded by casting phosphorus pig iron with good fluidity and cold brittleness, so that the guide rod assembly and the carbon block are combined into one. When transported to the electrolysis process for use, it can enhance conductivity, reduce power consumption losses, and thus reduce production costs.

[0003] At the same time, this assembly technology also exposed some problems during use. During the assembly process, this technology involves the pouring of molten phosphorus pig iron. Before pouring, the other anode modules need to be heated to a suitable temperature as a whole. In this process, a lot of energy is consumed, which increases the assembly cost. The connection grooves between the steel claws, carbon blocks and cast phosphorus pig iron prepared by this technology are relatively simple, and there are differences in thermal expansion performance between the three. During use, the whole needs to be immersed in high-temperature aluminum liquid, which makes it easy for the three to loosen and disengage, increasing the voltage drop caused by the passage of current between the three, and also increasing safety hazards. In addition, during the aluminum electrolysis process, the phosphorus pig iron will be corroded by the high-temperature molten aluminum liquid and electrolyte, as well as the oxygen generated during the electrolysis process, resulting in surface oxidation, further increasing the voltage drop.

[0004] Therefore, how to reduce energy consumption during anode assembly and ensure the safety of connection between assembled components and the stability of voltage drop are of great significance to reducing the production cost of the electrolytic aluminum industry. Summary of the invention

[0005] The purpose of the present invention is to provide an electrolytic aluminum anode structure and a manufacturing method based on electroplated silver spiral phosphorus pig iron connection in order to solve the problems existing in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is: On the one hand, an electrolytic aluminum anode structure based on electroplated silver spiral phosphorus pig iron connection is provided, comprising an anode carbon block, wherein a plurality of carbon bowls are provided on the anode carbon block, and each of the carbon bowls is provided with an inner spiral groove; It further includes an anode steel claw assembly, which is provided with a plurality of steel claw teeth. One end of each steel claw tooth is provided with phosphor cast iron, and the phosphor cast iron is connected to the carbon bowl. The outer circumference of the phosphor cast iron is provided with an outer spiral groove that matches the inner spiral groove, and the surface of the phosphor cast iron is also provided with a silver plating layer.

[0007] Through the arrangement of the inner spiral groove and the outer spiral groove, the electrolytic aluminum anode structure can better connect the phosphor cast iron and the carbon bowl, significantly increasing the contact area between the phosphor cast iron and the carbon bowl. Compared with the traditional connection of phosphor cast iron, it can provide a more stable connection effect, effectively reducing the problem of connection loosening caused by factors such as vibration during the production of electrolytic aluminum. Due to the increase in the contact area, the path for current transmission becomes wider, and the resistance will correspondingly decrease, resulting in a reduction in voltage drop. At the same time, the increase in the contact area enables the current to pass through the connection part more evenly and efficiently, thereby enhancing the conductive effect and improving the efficiency and stability of current transmission. Due to the increase in the contact area, the voltage drop generated by the passing of current is effectively reduced, enhancing the conductive effect.

[0008] Setting the silver plating layer on the outer circumference of the phosphor cast iron can greatly enhance the conductivity and corrosion resistance of the phosphor cast iron, extending the service life of the anode structure. It can reduce the resistance of the connection part, improve the current transmission efficiency, and at the same time avoid the surface high-temperature oxidation of the phosphor cast iron during use, thereby reducing power consumption and the cost of electrolytic aluminum production.

[0009] Furthermore, the anode carbon block is provided with a carbon block boss, and a plurality of the carbon bowls are arranged at intervals in the carbon block boss in sequence.

[0010] Furthermore, the number of the steel claw teeth and the carbon bowls is respectively 3 to 6, and they are arranged in one-to-one correspondence.

[0011] Furthermore, the anode steel claw assembly includes a steel claw cross beam, which is arranged parallel to the anode carbon block, and a plurality of the steel claw teeth are detachably suspended on the steel claw cross beam.

[0012] Furthermore, one end of the steel claw tooth is provided with a connecting screw, and the connecting screw is fixedly connected to the steel claw cross beam through a nut or a screw nut.

[0013] Furthermore, the other end of the steel claw tooth is formed with the phosphor cast iron by casting.

[0014] Furthermore, both the outer spiral groove and the inner spiral groove are of variable pitch structure, with the pitch gradually increasing from the bottom to the top, and the variation range of the pitch being 6 - 12 mm. With this variable pitch design, it can adapt to the thermal expansion gradient; at high temperatures, the pitch at the top shortens more significantly due to a higher expansion rate, forming a dynamic balance with the contraction trend at the bottom, and the overall interface contact pressure distribution is more uniform.

[0015] Furthermore, the spiral lines of the outer spiral groove and the inner spiral groove rotate and rise around the central axis at an inclination angle of 5° - 15°, forming an asymmetric three-dimensional spiral; the spiral line rises 0.3 - 0.8 mm upward every 180° rotation along the axial direction, forming a spiral lift angle, which can guide the release of thermal expansion deformation along the spiral path and avoid radial separation. The three-dimensional spiral gradient structure can also force the carbon bowl and the electroplated silver phosphorus cast iron to form a face-to-face contact, and the contact area between the carbon bowl and the electroplated silver phosphorus cast iron is significantly increased compared with the prior art.

[0016] On the other hand, a manufacturing method of an electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphorus cast iron is provided. The manufacturing method includes the following steps: Manufacture the anode carbon block and set the carbon bowl, and machine the inner spiral groove in the carbon bowl; Production and processing of the steel claw teeth and the phosphorus cast iron: According to the size of the inner spiral groove, prefabricate a phosphorus cast iron casting mold, place one end of the steel claw teeth in the casting mold, pour molten phosphorus cast iron into the casting mold, and after cooling and forming, open the casting mold to obtain the steel claw teeth with an outer spiral groove phosphorus cast iron; Machine the obtained steel claw teeth, machine a connecting screw at the end away from the phosphorus cast iron, and perform finish machining on the outer spiral groove on the outer periphery of the phosphorus cast iron to be adapted to the size of the inner spiral groove; Perform electroplating treatment on the phosphorus cast iron with the outer spiral groove to deposit a uniform and dense electroplated silver layer. After the electroplating treatment is completed, clean and dry the steel claw teeth and set them aside for use; Assemble the anode steel claw assembly and the carbon bowl, install the phosphorus cast iron of each steel claw tooth into the corresponding carbon bowl respectively, set a steel claw cross beam above the plurality of steel claw teeth, and connect and fix it to the connecting screw through a nut or a screw cap.

[0017] This manufacturing method enables the batch production and processing of the anode steel claw assemblies in a factory, and they can be assembled as needed during use, simplifying the production process of aluminum electrolysis enterprises; the design of the outer spiral groove and the inner spiral groove makes the assembly of the phosphorus cast iron and the carbon bowl more convenient and rapid. Without complex production processes, the connection can be completed simply by screwing the spiral phosphorus cast iron into the carbon bowl, greatly improving the assembly efficiency. The above casting process is simple, the assembly is convenient and rapid, significantly improving the assembly efficiency; during the aluminum electrolysis process of the electrolytic aluminum anode structure produced by the above method, the voltage drop is significantly reduced, the current efficiency is significantly improved, and the heat-resistant corrosion ability of the anode is enhanced, effectively extending the service life of the anode structure.

[0018] Further, the electroplating treatment includes the following steps: Clean the phosphorus cast iron and its outer spiral groove; Roughen the surfaces of the phosphorus cast iron and the outer spiral groove by sandblasting; Take the phosphorus cast iron as the cathode, immerse it in the prepared silver electroplating solution, apply a preset current and voltage, and cause the silver ions to undergo a reduction reaction on the surfaces of the phosphorus cast iron and the outer spiral groove, depositing to form a uniform and dense silver electroplating layer.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the arrangement of the inner spiral groove and the outer spiral groove in the electrolytic aluminum anode structure, on the one hand, the contact area between the ferrophosphorus and the carbon bowl is significantly increased. Compared with the traditional connection of ferrophosphorus, a more stable connection effect can be provided, effectively reducing the problem of connection looseness caused by factors such as vibration during the production of electrolytic aluminum. On the other hand, due to the increase in the contact area, the path of current transmission becomes wider during transmission, and the resistance will correspondingly decrease, resulting in a decrease in voltage drop. The increase in the contact area also enables the current to pass through the connection part more evenly and efficiently, thereby enhancing the conductive effect and improving the efficiency and stability of current transmission. Due to the increase in the contact area, the voltage drop generated by the passing of current is effectively reduced, enhancing the conductive effect; 2. The combined setting of the inner spiral groove and the outer spiral groove is different from the thread connection method and other groove connection methods in the prior art. In the present invention, the inner spiral groove and the outer spiral groove are used to connect the ferrophosphorus and the carbon bowl, and at the same time, the spiral groove is used to improve the connection stability and circuit transmission stability, which is beneficial to enhancing the safety and effectiveness of the entire electrolytic aluminum anode structure, reducing energy consumption, and lowering the production cost of electrolytic aluminum; 3. By setting the silver plating layer on the outer periphery of the ferrophosphorus, the conductivity of the ferrophosphorus can be greatly enhanced, the resistance of the connection part can be reduced, the current transmission efficiency can be improved, and at the same time, the surface high-temperature oxidation of the ferrophosphorus during use can be avoided, thereby reducing power loss and lowering the production cost of electrolytic aluminum. The silver-plated spiral ferrophosphorus connection of the present invention also has better corrosion resistance, extending the service life of the anode structure; 4. The setting of the silver plating layer on the ferrophosphorus in the present invention is different from the prior art of setting a plating layer on the surface of the carbon bowl. In the present invention, the silver plating layer is transferred from the carbon bowl to the three-dimensional spiral surface of the ferrophosphorus. The ferrophosphorus is a metal matrix, and the bonding force of the plating layer is enhanced. Moreover, the three-dimensional spiral gradient design makes the silver plating layer a conductive path topology on the surface of the ferrophosphorus, rather than an additional layer; 5. The electrolytic aluminum anode structure based on the silver-plated spiral ferrophosphorus connection optimizes the current path. From the steel claw teeth to the silver-plated ferrophosphorus and then to the anode carbon block, the steel claw teeth and the silver-plated ferrophosphorus form a first interface with extremely low resistance. The silver-plated ferrophosphorus and the carbon bowl form a second interface. While achieving a tight mechanical fit through the three-dimensional spiral gradient structure, the contact resistance is also significantly reduced; 6. This manufacturing method can mass-produce and process the anode steel claw assembly in the factory, and it can be assembled as needed during use, simplifying the production process of electrolytic aluminum enterprises. The design of the outer spiral groove and the inner spiral groove makes the assembly of the ferrophosphorus and the carbon bowl more convenient and fast. Without complex production processes, the spiral-shaped ferrophosphorus can be screwed into the carbon bowl to complete the connection, greatly improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an overall schematic diagram of the electrolytic aluminum anode structure based on the silver-plated spiral ferrophosphorus connection of the present invention; Figure 2 Structural schematic diagram of the claw teeth of the steel claw and the phosphorus cast iron of the present invention; Figure 3 Structural schematic diagram of the phosphorus cast iron of the present invention; Figure 4 Structural schematic diagram of the carbon bowl of the present invention; Figure 5 Cross-sectional structural schematic diagram of the carbon bowl of the present invention; Figure 6 Variable pitch structural schematic diagram of the phosphorus cast iron of the present invention; In the figure: 1. Steel claw crossbeam; 2. Connecting screw; 3. Claw teeth of the steel claw; 4. Phosphorus cast iron; 5. Carbon bowl; 6. Carbon block boss; 7. Anode carbon block; 8. Nut; 9. Connecting screw; 10. Silver plating layer; 11. Inner spiral groove; 12. Outer spiral groove. Specific embodiments

[0021] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work conditions belong to the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying 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 therefore cannot be understood as a limitation to the present invention. Embodiment 1

[0023] As Figures 1 to 4 shown, an electrolytic aluminum anode structure based on electroplated silver spiral phosphorus cast iron connection includes an anode carbon block 7, and a plurality of carbon bowls 5 are provided on the anode carbon block 7. An inner spiral groove 11 is provided in each of the carbon bowls 5; It further includes an anode steel claw assembly. The anode steel claw assembly is provided with a plurality of claw teeth 3 of the steel claw. One end of the claw teeth 3 of the steel claw is provided with phosphorus cast iron 4. The phosphorus cast iron 4 is connected to the carbon bowl 5. An outer spiral groove 12 matching the inner spiral groove 11 is provided on the outer periphery of the phosphorus cast iron 4, and a silver plating layer 10 is further provided on the surface of the phosphorus cast iron 4.

[0024] Through the arrangement of the inner spiral groove 11 and the outer spiral groove 12, the anode structure of this electrolytic aluminum can better connect the phosphorus cast iron 4 and the carbon bowl 5. On the one hand, this spiral groove structure significantly increases the contact area between the phosphorus cast iron 4 and the carbon bowl 5. Compared with the traditional connection of phosphorus cast iron, it can provide a more stable connection effect and effectively reduce the problem of connection loosening caused by factors such as vibration during the production process of electrolytic aluminum. On the other hand, due to the increase in the contact area, the path of current transmission becomes wider during the transmission process, and the resistance will correspondingly decrease, resulting in a reduction in voltage drop. Moreover, the increase in the contact area enables the current to pass through the connection part more evenly and efficiently, thereby enhancing the conductive effect and improving the efficiency and stability of current transmission. Due to the increase in the contact area, the voltage drop generated by the passing of current is effectively reduced, and the conductive effect is enhanced.

[0025] The combined arrangement of the inner spiral groove 11 and the outer spiral groove 12 is different from the threaded connection method and other groove connection methods in the prior art. The present invention not only uses the combination of the inner spiral groove 11 and the outer spiral groove 12 to connect the phosphorus cast iron 4 and the carbon bowl 5, but also relies on this spiral groove to improve the connection stability and circuit transmission stability, which is beneficial to enhancing the safety and effectiveness of the entire electrolytic aluminum anode structure, reducing energy consumption, and lowering the production cost of electrolytic aluminum.

[0026] Setting the silver plating layer 10 on the outer periphery of the phosphorus cast iron 4 can greatly enhance the electrical conductivity and corrosion resistance of the phosphorus cast iron 4. The silver plating layer 10 has excellent electrical conductivity, can reduce the resistance of the connection part, improve the current transmission efficiency, and at the same time avoid the surface high-temperature oxidation of the phosphorus cast iron during use, thereby reducing power consumption and lowering the production cost of electrolytic aluminum. In the electrolytic aluminum environment, the electrolyte has strong corrosiveness, and the traditional connection of phosphorus cast iron is easily corroded, affecting the service life. However, the silver-plated spiral phosphorus cast iron connection of the present invention has better corrosion resistance and prolongs the service life of the anode structure.

[0027] The present invention setting the silver plating layer 10 on the phosphorus cast iron 4 is different from the prior art of setting a plating layer on the surface of the carbon bowl. In the prior art, the combination of the carbon matrix and the metal plating layer is easily peeled off due to high-temperature oxidation or mechanical wear. The present invention transfers the silver plating layer from the carbon bowl to the three-dimensional spiral surface of the phosphorus cast iron. The phosphorus cast iron is a metal matrix, and the bonding force of the plating layer is enhanced. Moreover, the three-dimensional spiral gradient design makes the silver plating layer a conductive path topology on the surface of the phosphorus cast iron, rather than an additional layer.

[0028] The electrolytic aluminum anode structure based on electroplated silver spiral phosphor cast iron connection embodies the "single-stage functional interface" design, optimizing the current path from the steel claw teeth to the electroplated silver phosphor cast iron and then to the anode carbon block. The steel claw teeth 3 and the electroplated silver phosphor cast iron form a first interface, namely a metal-metal interface, with extremely low resistance; the electroplated silver phosphor cast iron and the carbon bowl 5 form a second interface, namely a metal-carbon interface. While achieving tight mechanical interlocking through a three-dimensional spiral gradient structure, the contact resistance is also significantly reduced.

[0029] Furthermore, a carbon block boss 6 is provided on the anode carbon block 7, and a number of the carbon bowls 5 are arranged at intervals in the carbon block boss 6. The carbon bowls 5 are arranged in rows at equal intervals. The setting of the carbon block boss 6 facilitates the processing of the carbon bowls 5 without damaging the body structure of the anode carbon block 7, and the carbon bowls 5 can be completely arranged within the carbon block boss 6.

[0030] Furthermore, 3 to 6 steel claw teeth 3 and carbon bowls 5 are respectively provided and arranged in one-to-one correspondence. For example, each anode steel claw assembly is provided with 6 steel claw teeth, and the number of carbon bowls provided at the carbon block boss is also 6, corresponding one-to-one to the anode steel claw teeth. In this embodiment, 4 steel claw teeth and carbon bowls are respectively provided.

[0031] Furthermore, the anode steel claw assembly includes a steel claw cross beam 1, the steel claw cross beam 1 is arranged parallel to the anode carbon block 7, and a plurality of the steel claw teeth 3 are detachably suspended on the steel claw cross beam 1.

[0032] Furthermore, a connecting screw 9 is provided at one end of the steel claw tooth 3, and the connecting screw 9 is fixedly connected to the steel claw cross beam 1 through a nut 8 or a nut. The steel claw tooth can also be connected to the steel claw cross beam by means of screws.

[0033] In this embodiment, the steel claw tooth is detachably connected to the steel claw cross beam 1 through the connecting screw 9 and the nut. This connection method is simple and convenient, and is also beneficial to subsequent disassembly and maintenance. Different numbers of steel claw teeth 3 can be connected below each steel claw cross beam 1 according to needs. When a single steel claw tooth 3 fails, it can be disassembled separately for repair or replacement without overall maintenance, without affecting the normal use of other steel claw teeth.

[0034] Furthermore, the other end of the steel claw tooth 3 is formed into the phosphor cast iron 4 by casting. The phosphor cast iron 4 produced in this way has better connection stability and effectiveness with the steel claw tooth 3, can form an integrated structure, and the required external spiral groove 12 can be cast together, reducing the processing difficulty of the external spiral groove.

[0035] In this embodiment, the outer spiral groove 12 and the inner spiral groove 11 are closely fitted, preferably with an interference fit, which can make the phosphor cast iron 4 and the carbon bowl 5 closely fit and connect. An interference fit can also form a direct conduction path; the axial height of the phosphor cast iron 4 is basically the same as the depth of the carbon bowl 5, so that the phosphor cast iron 4 is just accommodated in the carbon bowl 5.

[0036] The operating temperature of the aluminum electrolytic cell is as high as about 960 °C. The thermal expansion coefficients of the phosphor cast iron (CTE≈12×10 -6 / °C) and the carbon bowl (CTE≈4.5×10 -6 / °C) are significantly different, which will cause the interfacial contact pressure to change violently with temperature. In order to reduce the problem that local gaps or stress concentrations are likely to occur due to the mismatch of linear expansion at high temperatures in the spiral structure, the present invention further improves the structures of the inner spiral groove and the outer spiral groove.

[0037] Furthermore, as shown in Figure 5 and Figure 6 , both the outer spiral groove 12 and the inner spiral groove 11 are variable pitch structures, and the pitch gradually increases from the bottom to the top. The variation range of the pitch is 6 - 12 mm.

[0038] The variable pitch design with 6 mm - 12 mm can adapt to the thermal expansion gradient; the pitch at the top is larger (12 mm), and the pitch at the bottom is smaller (6 mm). At high temperatures, the pitch at the top shrinks more due to a higher expansion rate, forming a dynamic balance with the contraction trend at the bottom, and the overall interfacial contact pressure distribution is more uniform.

[0039] This variable pitch design can also extend the effective conduction path, which is 1.5 times that of the fixed pitch. After calculation, the current density per unit area can be reduced from 30 A / cm² to 18 A / cm², reducing the accumulation of Joule heat. After calculation, the local temperature is reduced by 50 - 80 °C.

[0040] Furthermore, the spiral lines of the outer spiral groove 12 and the inner spiral groove 11 rotate and rise around the central axis at an inclination angle of 5° - 15°, forming an asymmetric three-dimensional spiral; the spiral line rises 0.3 - 0.8 mm upward every 180° rotation along the axis, forming a spiral lift angle. In this embodiment, the spiral line rises 0.5 mm upward every 180° rotation along the axis.

[0041] The above-mentioned asymmetric three-dimensional spiral and the setting of the spiral lift angle can guide the release of thermal expansion deformation along the spiral path and avoid radial separation. The three-dimensional spiral gradient structure can also force the carbon bowl and the electroplated silver phosphor cast iron to form a face-to-face contact, and the contact area between the carbon bowl and the electroplated silver phosphor cast iron is significantly increased compared with the prior art.

[0042] Moreover, the pitch gradually decreases from the top to the bottom, and the stress decreases along the helix gradient, avoiding local stress concentration. The three-dimensional lifting design causes the helix to undergo slight torsion during axial thermal expansion, offsetting the shear force between the carbon bowl and the steel claws, and enhancing the interfacial shear strength. Example 2

[0043] A manufacturing method of an electrolytic aluminum anode structure based on electroplated silver spiral phosphor cast iron connection, the manufacturing method comprising the following steps: Step 1: Manufacture the anode carbon block 7 and set the carbon bowl 5. If there is a carbon block boss 6, set the carbon bowl 5 inside the carbon block boss 6, and machine the inner spiral groove 11 inside the carbon bowl 5.

[0044] Step 2: Production and processing of the steel claw teeth 3 and the phosphor cast iron 4: According to the size of the inner spiral groove 11, prefabricate a phosphor cast iron casting mold, place one end of the steel claw teeth 3 into the casting mold, pour molten phosphor cast iron into the casting mold, and after cooling and forming, open the casting mold to obtain the steel claw teeth 3 with an outer spiral groove phosphor cast iron; Machine process the obtained steel claw teeth 3, machine a connecting screw 2 at one end away from the phosphor cast iron, and perform fine processing on the outer spiral groove on the outer periphery of the phosphor cast iron 4 to make it match the size of the inner spiral groove 11 and increase its fit with the inner spiral groove.

[0045] Step 3: Perform electroplating treatment on the phosphor cast iron 4 with the outer spiral groove 12 to deposit a uniform and dense electroplated silver layer 10. After the electroplating treatment is completed, clean and dry the steel claw teeth and set them aside for later use.

[0046] Step 4: Assemble the anode steel claw assembly and the carbon bowl. Install the phosphor cast iron 4 of each steel claw tooth into the corresponding carbon bowl 5 respectively, set a steel claw crossbeam 1 above the plurality of steel claw teeth 3, and connect and fix it to the connecting screw 2 through a nut or a screw cap 8.

[0047] This manufacturing method can mass-produce and process the anode steel claw assembly in the factory, and only need to assemble it as needed during use, simplifying the production process of electrolytic aluminum enterprises; the design of the outer spiral groove and the inner spiral groove makes the assembly of the phosphor cast iron and the carbon bowl more convenient and fast. Without complex production processes, the spiral phosphor cast iron can be screwed into the carbon bowl to complete the connection, greatly improving the assembly efficiency. The above casting process is simple, the assembly is convenient and fast, significantly improving the assembly efficiency; the voltage drop during the aluminum electrolysis process of the electrolytic aluminum anode structure produced by the above method is significantly reduced, the current efficiency is significantly improved, and the heat-resistant corrosion ability of the anode is enhanced, effectively extending the service life of the anode structure.

[0048] Further, in the step 2, after removing rust and cleaning the surface of the steel claw teeth, place them in the casting mold.

[0049] Further, the electroplating treatment in step 3 includes the following steps: Clean the phosphorus pig iron and its outer spiral groove; use running water to thoroughly clean the spiral phosphorus pig iron to remove grease, dust and other impurities generated during casting and machining on the surface, ensuring that the surface is clean and pollution-free.

[0050] Roughen the surface of the phosphorus pig iron and the outer spiral groove by sandblasting to increase the surface roughness, so as to improve the bonding force between the electroplated layer and the substrate material.

[0051] Take the phosphorus pig iron as the cathode, immerse it in the prepared electroplating silver solution, apply a preset current and voltage, so that silver ions undergo a reduction reaction on the surface of the phosphorus pig iron and the outer spiral groove, and deposit to form a uniform and dense electroplated silver layer. After electroplating, take out the spiral phosphorus pig iron from the electroplating solution, wash it with running water to remove the residual electroplating solution and impurities on the surface, and then perform a drying treatment to remove the surface moisture. The silver-plated layer obtained by the above method has good quality, is smooth and flat, which is beneficial to the subsequent connection and fitting with the inner spiral groove in the carbon bowl.

[0052] The electroplating silver step time is 15 - 20 minutes; the main component of the electroplating silver solution is silver nitrate, the concentration range is 30 - 100 g / L, and the pH of the electroplating silver solution is controlled at 8 - 11; the applied current density is 0.5 - 2 A / dm². In the actual electroplating process, the relevant electroplating solution components and process parameters can be tested and adjusted according to the actual specific equipment conditions to ensure obtaining a high-quality electroplated silver layer.

[0053] In some embodiments, prepare an electroplating silver solution with the main component of silver nitrate, a concentration range of 30 g / L, and a pH of 8. Take the phosphorus pig iron with an outer spiral groove as the cathode, immerse it in the electroplating silver solution, apply a current with a current density of 0.5 A / dm², and electroplate silver for 15 minutes, so that silver ions undergo a reduction reaction on the surface of the spiral phosphorus pig iron and deposit to form a uniform and dense silver layer.

[0054] In other embodiments, prepare an electroplating silver solution with the main component of silver nitrate, a concentration range of 100 g / L, and a pH of 11. Take the phosphorus pig iron with an outer spiral groove as the cathode, immerse it in the electroplating silver solution, apply a current with a current density of 2 A / dm², and electroplate silver for 20 minutes, so that silver ions undergo a reduction reaction on the surface of the spiral phosphorus pig iron and deposit to form a uniform and dense silver layer.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron includes an anode carbon block, and is characterized in that, A number of carbon bowls are provided on the anode carbon block, and each carbon bowl is respectively provided with an inner spiral groove; It further includes an anode steel claw assembly. The anode steel claw assembly is provided with a number of steel claw teeth. One end of the steel claw teeth is provided with ferrophosphorus, the ferrophosphorus is connected to the carbon bowl, an outer spiral groove matching the inner spiral groove is provided on the outer periphery of the ferrophosphorus, and a silver plating layer is further provided on the surface of the ferrophosphorus.

2. The electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron according to claim 1, characterized in that, A carbon block boss is provided on the anode carbon block, and a number of the carbon bowls are arranged at intervals in sequence within the carbon block boss.

3. The electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron according to claim 1, characterized in that, The steel claw teeth and the carbon bowls are respectively provided with 3 to 6, and are arranged in one-to-one correspondence.

4. The electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron according to claim 1, characterized in that, The anode steel claw assembly includes a steel claw cross beam, the steel claw cross beam is arranged parallel to the anode carbon block, and a plurality of the steel claw teeth are detachably suspended on the steel claw cross beam.

5. The electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron according to claim 4, characterized in that, One end of the steel claw teeth is provided with a connecting screw rod, and the connecting screw rod is fixedly connected to the steel claw cross beam through a nut or a screw nut.

6. The electrolytic aluminum anode structure based on electroplated silver spiral phosphor cast iron connection according to claim 1, wherein The other end of the steel claw teeth is formed with the ferrophosphorus by means of casting.

7. The electrolytic aluminum anode structure based on electroplated silver spiral phosphor pig iron connection according to claim 1, characterized in that, Both the outer spiral groove and the inner spiral groove are variable pitch structures, and the pitch gradually increases from the bottom to the top. The variation range of the pitch is 6 to 12 mm.

8. The electrolytic aluminum anode structure based on electroplated silver spiral phosphor cast iron connection according to claim 1, characterized in that, The spiral lines of the outer spiral groove and the inner spiral groove respectively rotate and rise around the central axis at an inclination angle of 5° to 15°, forming an asymmetric three-dimensional spiral; the spiral line rises 0.3 to 0.8 mm upward every 180° rotation along the axis, forming a spiral lift angle.

9. The manufacturing method of the electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor cast iron according to any one of claims 1 to 8, characterized in that, The manufacturing method includes the following steps: Manufacture the anode carbon block and set the carbon bowl, and machine the inner spiral groove in the carbon bowl; Production and processing of the steel claw teeth and the ferrophosphorus: According to the size of the inner spiral groove, prefabricate a ferrophosphorus casting mold, place one end of the steel claw teeth in the casting mold, pour the molten ferrophosphorus into the casting mold, and after cooling and forming, open the casting mold to obtain the steel claw teeth with ferrophosphorus having an outer spiral groove; Machine the obtained steel claw teeth, machine a connecting screw rod at one end away from the ferrophosphorus, and perform fine processing on the outer spiral groove on the outer periphery of the ferrophosphorus to be adapted to the size of the inner spiral groove; Perform electroplating treatment on the ferrophosphorus with the outer spiral groove, deposit to form a uniform and dense silver plating layer. After the electroplating treatment is completed, clean and dry the steel claw teeth and reserve them for use; Assemble the anode steel claw assembly and the carbon bowl, respectively install the ferrophosphorus of each steel claw tooth into the corresponding carbon bowl, set a steel claw cross beam above the plurality of steel claw teeth, and connect and fix it to the connecting screw rod through a nut or a screw nut.

10. The manufacturing method of the electrolytic aluminum anode structure based on the connection of electroplated silver spiral phosphor pig iron according to claim 9, characterized in that, The electroplating treatment includes the following steps: Clean the ferrophosphorus and its outer spiral groove; Roughen the surfaces of the ferrophosphorus and the outer spiral groove by sandblasting; Take the ferrophosphorus as the cathode, immerse it in the prepared electroplating silver solution, apply a preset current and voltage, so that silver ions undergo a reduction reaction on the surfaces of the ferrophosphorus and the outer spiral groove, and deposit to form a uniform and dense silver plating layer.

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