A cathode conductive output device for an aluminum electrolysis cell

Abstract

A novel cathode conductive output device for aluminum electrolysis cells is a technical solution proposed to eliminate the negative impact of horizontal current in the aluminum melt layer within the molten aluminum pool on the electrolytic production process, reduce the cathode voltage drop, and improve the service life and current efficiency of the aluminum electrolysis cell. The cathode conductive output device of this invention is composed of a cathode carbon block and a circular cathode steel rod. The upper part of the cathode carbon block has a trapezoidal cross-section with high ends and a low middle section. The circular cathode steel rod is a copper-steel composite structure or a threaded rod cathode steel rod configuration. After the aluminum electrolysis cell is constructed, this cathode conductive output device allows the cathode current to be output from the aluminum melt layer within the molten aluminum pool to be conducted to the cathode busbar at the bottom of the outer side of the aluminum electrolysis cell through a region with relatively low resistance in the cathode carbon block and steel rod assembly.

Description

[0001] Technical Field: A cathode conductive output device for aluminum electrolysis cells is mainly used in the design and manufacture of aluminum electrolysis cell structures and in the production of electrolytic aluminum.

[0002] Background technology: The cathode conductive output device of aluminum electrolysis cell, also known as the cathode carbon block steel rod assembly of electrolysis cell, is built on the upper part of the internal insulation layer and anti-seepage layer of the aluminum electrolysis cell shell. It is used to construct the bottom of the cathode molten pool of aluminum electrolysis cell for the conductive output of cathode current of aluminum liquid. This component has the functions of carrying aluminum liquid electrolyte and transmitting cathode current.

[0003] The main structural features of the existing aluminum electrolysis cell cathode conductive output device, namely the cathode carbon block and steel rod assembly, are as follows: A continuous concave groove of the cathode steel rod is machined along the length of the rectangular cathode carbon block at its bottom. The cathode carbon block is then inverted so that the concave groove faces upwards. A rectangular strip-shaped cathode steel rod is then attached to the cathode carbon block using either steel rod bonding or casting with phosphorus pig iron, forming an aluminum electrolysis cell cathode conductive output device assembly. Figure 1 Figure 2 As shown, the design specifications for the cathode conductive output device of the aluminum electrolysis cell require that a sealant be used to construct a heat-insulating and leak-proof layer on the bottom shell of the aluminum electrolysis cell, thereby forming an aluminum electrolysis cell cathode molten pool structure with side furnace walls on the periphery and a planar cathode conductor at the bottom. The existing technology mainly has the following defects:

[0004] (I) Existing cathode conductive output devices for aluminum electrolysis cells have poor conductivity. In the electrolysis process, existing technology uses a conductive transition dielectric layer, approximately 15mm thick, filled with graphite carbon material or cast metal, between the inner wall surface of the concave groove of the cathode carbon block and the rectangular cathode steel rod, and between the outer surface layer of the rectangular cathode steel rod. The presence of this conductive transition dielectric layer not only increases the construction and material costs of the cathode carbon block and the rectangular cathode steel rod, but also adds a conductive transition dielectric layer and a conductive interface between them, thereby increasing the structural voltage drop of the cathode carbon block and steel rod assembly.

[0005] (II) Existing aluminum electrolytic cell cathode conductivity output devices suffer from low structural strength and poor stability: In existing cathode carbon block and steel rod assemblies, as the electrolytic heating temperature increases during electrolysis, the difference in thermal expansion stress between the cathode steel rod and the cathode carbon block also increases. Because the bottom of the concave opening of the cathode steel rod at the bottom of the cathode carbon block lacks structural constraint to support the expansion of the cathode steel rod, the horizontal thermal expansion stress generated outward under heat load concentrates at the corner connection of the concave opening, forming cracks. This leads to a sharp decline in the overall structural stability and conductivity of the cathode carbon block and steel rod assembly, shortening the service life of the aluminum electrolytic cell and prematurely requiring major repairs. This not only increases the major repair costs of the aluminum electrolytic cell but also increases the amount of hazardous waste slag generated during the major repairs.

[0006] (III) The existing cathode conductive output device for aluminum electrolysis cells has high construction costs: The existing cathode carbon block steel claw assembly, whether using cast iron phosphate to construct an intermediate layer of iron phosphate conductive medium between the open concave steel bar groove under the cathode carbon block and the cathode steel bar, or using carbon graphite steel bars pasted on to construct an intermediate layer of carbon graphite conductive medium between the open concave steel bar groove under the cathode carbon block and the cathode steel bar, not only requires material costs, but also a large amount of labor and mechanical power costs. In particular, the construction process of casting iron phosphate requires heating the cathode carbon block and cathode steel bar to 7020℃ before it can be implemented, which consumes a lot of electrical energy, thus resulting in high construction costs for the cathode carbon block steel claw assembly.

[0007] (iv) In existing aluminum electrolysis cell cathode conductive output devices, the cathode molten pool structure, when used in aluminum electrolysis production, results in a strong horizontal current generated within the aluminum molten pool. This horizontal current causes impacts on the aluminum molten pool's flow field, leading to corrosion damage to the side furnace walls and cathode carbon blocks, and ultimately, increased energy consumption in aluminum electrolysis production. This impacts the vertical fluctuations in the electrolyte layer and the secondary reduction reaction of the aluminum molten pool. Ultimately, this affects the overall current efficiency of the aluminum electrolysis cell and increases the power consumption for aluminum electrolysis production.

[0008] my country is a major producer of electrolytic aluminum. With technological advancements in the electrolytic aluminum industry, large-scale aluminum electrolytic cells (400KA and above) have become the main type of cell in my country's production. While the increased size of aluminum electrolytic cells has positively contributed to increasing the aluminum output per unit, improving labor productivity, and reducing production costs, the cathode conductive output device—the cathode carbon block steel rod assembly—still employs the traditional structure and construction process of bottom-mining rectangular cathode steel rods. This not only results in high construction costs, short service life, and high resistance and voltage drop, but also exacerbates the breakage rate of the cathode molten pool in large aluminum electrolytic cells, further shortening their lifespan. The aforementioned major defects in the existing structural design and manufacturing assembly process of the cathode steel rod conductors in aluminum electrolytic cells have become core technical problems urgently needing to be solved, hindering energy conservation, emission reduction, and carbon reduction in my country's electrolytic aluminum industry.

[0009] Summary of the Invention: To address the four problems and deficiencies in existing technologies, and to improve the conductivity of the cathode carbon block steel rod assembly, reduce the construction cost of the cathode conductive output device for aluminum electrolysis cells, optimize the structural performance of the cathode molten pool in aluminum electrolysis cells, extend the service life of aluminum electrolysis cells, improve the production process conditions of aluminum electrolysis cells, and increase the current efficiency of aluminum electrolysis cells, this invention discloses a novel structure for a cathode molten pool conductive output device for aluminum electrolysis cells, based on the principles of the thermoelectrochemical reaction process of aluminum electrolysis cells and experience from production practice. Its innovative technical solution is as follows:

[0010] In order to eliminate the weakening of the horizontal current balance of the cathode current output distribution in the electrolytic melting pool of the aluminum electrolytic cell, the horizontal setting of the upper surface of the cathode carbon block of the existing aluminum electrolytic cell cathode conductive output device is changed to an inclined trapezoidal surface design with high ends and low middle.

[0011] In order to reduce the resistance and voltage drop of the cathode carbon block steel rod assembly connection structure in the cathode conductive output device of aluminum electrolysis cell, and to improve its conductivity and structural stability and reliability, the existing cathode carbon block steel rod assembly configured with rectangular cathode steel rods will be replaced with a circular copper-steel composite cathode steel rod or a threaded rod-type circular cathode steel rod.

[0012] In order to eliminate the weakened horizontal current in the electrolytic molten pool of the aluminum electrolytic cell and to balance the current distribution of the cathode carbon block steel rod group, the cathode current input end of the circular copper-steel composite structure cathode steel rod of the aluminum electrolytic cell cathode conductive output device is configured with a copper-clad steel composite structure; its conductive output end is configured with a smooth rod structure.

[0013] In order to eliminate the weakened horizontal current in the electrolytic melting pool of the aluminum electrolysis cell and to balance the current distribution of the cathode carbon block steel rod group, the cathode current input end section of the threaded rod cathode steel rod is configured with an external thread rod structure; the external thread of the threaded rod section is configured to correspond with the internal thread end of the cathode steel rod conductive connection hole (6) on the cathode carbon block, and the cathode current output end section of the threaded rod cathode steel rod is configured with a circular smooth rod structure.

[0014] To eliminate the weakened horizontal current within the electrolytic molten pool of the aluminum electrolysis cell and to balance the current distribution of the cathode carbon block steel rod assembly, the cathode current input section of the circular copper-steel composite cathode steel rod is configured with a copper-steel composite structure; this can be achieved by using a copper-clad steel composite structure or by directly connecting the circular copper rods. The outer diameter of the circular copper-steel composite cathode steel rod is configured to correspond to the inner diameter of the conductive connection hole on the cathode carbon block cathode steel rod.

[0015] In order to eliminate the weakening of the horizontal current in the electrolytic melting pool of the aluminum electrolytic cell and to balance the distribution of the cathode current, the horizontal structure of the upper surface of the cathode carbon block of the existing aluminum electrolytic cell cathode conductive output device is changed to an inclined trapezoidal structure with high ends and low middle.

[0016] To improve the structural stability of the cathode carbon block steel rod assembly in the cathode conductive output device of the aluminum electrolysis cell, enhance the structural strength of the central structure of the cathode carbon block, and prevent thermal stress-induced destructive fracture in the central part of the cathode carbon block within the electrolysis cell, the existing rectangular cathode steel rod groove extending along the length of the bottom of the cathode carbon block is replaced with a cathode steel rod conductive connection hole constructed in two sections from the left and right ends of the cathode carbon block towards the center. That is, the central part of the cathode carbon block is a solid structure, and the tops of the two cathode steel rod conductive connection holes constructed from the left and right ends towards the center of the cathode carbon block are separated by a certain distance, which is a non-through design.

[0017] The cathode carbon block steel rod assembly constructed using the above-mentioned innovative technical solution, after forming a cathode molten pool on the heat insulation and anti-leakage layer of the aluminum electrolysis cell shell, has the following technological characteristics during the production of electrolytic aluminum in the aluminum electrolysis cell: the cathode current to be output from the aluminum liquid layer in the electrolytic molten pool can be electrically output to the cathode busbar at the bottom outside the electrolysis cell through a current output path with relatively low resistance value of the cathode carbon block steel rod assembly, by artificially setting an ideal state.

[0018] The innovative technical solution eliminates the need for the existing technology's steel rod paste or phosphorus pig iron conductive transition medium layer between the cathode steel rod and the iron-carbon interface of the cathode carbon block. Instead, it uses a circular or screw-type cathode steel rod directly connected to the cathode carbon block. Compared with the existing technology, this not only reduces the material cost of the structure but also the construction process cost, and lowers the resistance value resulting from the materials and construction process.

[0019] The innovative technical solution eliminates the existing structure of a through-type cathode steel rod groove along the same straight length at the bottom of the cathode carbon block. Instead, the cathode steel rod mounting holes are divided into two sections extending towards the center, with a certain distance between them. This means the two cathode steel rod mounting holes are not interconnected. Therefore, compared to existing technologies, this not only reduces construction costs and improves the utilization rate of the cathode carbon block, but also enhances the strength and stability of the cathode carbon block itself. Furthermore, it provides material and structural technical support for constructing a sloping trapezoidal cathode on top of the cathode carbon block, preventing intermediate breakage during use.

[0020] The upper part of the rectangular cathode carbon block adopts a sloping structure design on both sides or a trapezoidal structure design that slopes down from both sides to the middle. Compared with the existing technology, this not only reduces and weakens the impact intensity of the horizontal current generated by the aluminum liquid layer in the aluminum electrolytic cell, and reduces the impact wear of the horizontal current on the side furnace structure and the upper surface structure of the cathode carbon block, but also reduces the negative impact of the fluctuation of the aluminum liquid magnetic flow field on the vertical fluctuation of the electrolyte liquid layer, and reduces the secondary oxidation of the produced aluminum liquid. This achieves the goal of improving current efficiency, reducing the power consumption of the electrolytic aluminum production process, and carrying out energy-saving and carbon-reducing production.

[0021] The accompanying drawings illustrate the innovative technical solution and features of the cathode current output conductive structure and molten pool structure of the aluminum electrolysis cell described in this invention. These features will become clearer when reading the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the cross-section of a cathode carbon block with a through-type bottom-opening concave steel rod groove at the bottom, as described in the prior art.

[0023] Figure 2 for Figure 1 Side view.

[0024] Figure 3 This is a cross-sectional schematic diagram of a cathode carbon block steel rod assembly constructed using existing technology, which has a through-type bottom-opening concave groove at the bottom of the cathode carbon block and is assembled by casting iron phosphate or using carbon ramming paste.

[0025] Figure 4 for Figure 3 Side view.

[0026] Figure 5 This is a current distribution diagram of the cathode current output state of a cathode molten pool structure constructed using existing cathode carbon block steel rod assembly under electrolytic cell operating conditions.

[0027] Figure 6 This is a front view of the structure of the aluminum electrolysis cell cathode conductive output device configured with a screw-type cathode steel rod according to Embodiment 1 of the present invention.

[0028] Figure 7 for Figure 6 Side view.

[0029] Figure 8 This is a front view of the cathode carbon block in Example 1.

[0030] Figure 9 for Figure 8 Side view.

[0031] Figure 10 This is a front view of the screw-type cathode steel rod of Example 1.

[0032] Figure 11 This is a front view of the cathode conductive output device of the aluminum electrolysis cell configured with a circular cathode steel rod fitted with a conductive copper sleeve, according to Embodiment 2 of the present invention.

[0033] Figure 12 for Figure 11 Side view.

[0034] Figure 13 This is a front view of the cathode carbon block of Example 2.

[0035] Figure 14 This is a side view of 13.

[0036] Figure 15 This is a schematic diagram of the structure of the circular cathode steel rod conductive output device in Example 2.

[0037] Figure 16 for Figure 15 AA cross-sectional view.

[0038] Figure 17 Example 3 uses the cathode conductive output device of the aluminum electrolysis cell described in this invention, namely the cathode electrolysis molten pool structure constructed by the cathode carbon block steel rod group and the cathode current output conduction current distribution state diagram.

[0039] Figure 18 This is a schematic diagram of the structure of the cathode conductive output device of the aluminum electrolysis cell of the present invention, namely the cathode carbon block steel rod group, in Example 4.

[0040] The diagram shows: 1. Cathode carbon block, 2. Rectangular cathode steel rod, 3. Concave steel rod groove, 4. Steel rod paste or phosphorus pig iron; 5. Threaded rod type round cathode steel rod, 5-1 Threaded rod section, 5-2 Round smooth rod section, 6. Cathode steel rod conductive connection hole, 7. Round copper-steel composite cathode steel rod, 7-1 Copper-steel composite section, 7-2 Low carbon steel material section, 8. Cathode aluminum liquid layer, 9. Electrolyte liquid layer, 10. Side furnace side, 11. Side furnace wall, 12. Electrolytic cell shell, 13. Insulation layer, 14. Leakage prevention layer, 15. Cathode current, 16. Anode conductive device, 17. Anode carbon block, 18. Aluminum-steel composite connecting plate, 19. Flexible busbar connecting device, 20. Cathode busbar, 21. Transition connecting plate, 22. Square-round transition connecting plate, 23. Conductive copper sleeve.

[0041] Detailed Implementation: The technical solution and features of the aluminum electrolysis cell cathode conductive device and construction method described in this invention will become clearer by reading the illustrations and detailed implementation methods in the specification.

[0042] Example 1: As Figure 6 and Figure 7 As shown, the cathode conductive output device of the aluminum electrolysis cell described in Embodiment 1 of the present invention is composed of a cathode carbon block (1) with a slope that slopes towards the middle and is high at both ends and low in the middle, and a circular cathode steel rod (5) with a threaded rod. The iron-carbon bonding interface between the threaded rod circular cathode steel rod (5) and the cathode carbon block (1) is directly bonded to the iron-carbon contact interface.

[0043] like Figure 8 Figure 9 As shown, the cathode carbon block described in Embodiment 1 has the following characteristics: Two symmetrical cathode steel rod conductive connection holes (6) are constructed along the length of the cathode carbon block from both ends towards the middle; an internal thread is provided at the cathode current input end of the cathode steel rod conductive connection hole (6), and this thread corresponds to the external thread at the conductive input end of the threaded rod-type circular cathode steel rod (5). These holes are located at both ends of the cathode carbon block, with a certain distance between the tops of the two symmetrical circular cathode steel rod mounting connection holes (6), i.e., a non-through design in the middle. This makes the bottom middle of the cathode carbon block a solid structure design, thereby meeting the structural strength stability and reliability requirements of the inclined trapezoidal concave section in the middle of the trapezoidal cathode carbon block under thermal stress.

[0044] like Figure 10 As shown, the circular cathode steel rod described in this embodiment 1 is divided into two sections in the length direction. One section is the part at the conductive input end of the cathode steel rod. The characteristic of this section is that it is provided with a threaded connection section (5-1). The external thread of the threaded connection section (5-1) corresponds to the internal thread of the conductive connection hole of the cathode steel rod on the cathode carbon block (1). The other section is the part at the conductive output end of the cathode steel rod. The characteristic of this section is that the outside of the round steel is a smooth rod configuration.

[0045] The purpose of designing a threaded connection at the conductive input end of the cathode steel rod is twofold: first, to increase the conductive connection area at the iron-carbon interface; and second, to strengthen the connection and fixation strength between the two, thereby improving the stability of the connection between the cathode steel rod and the cathode carbon block and reducing voltage drop.

[0046] At the current output end of the cathode steel rod, the cathode steel rod is set as a smooth rod. The purpose is to prevent the circular cathode steel rod from causing thermal stress damage to the cathode carbon block with a small thermal expansion coefficient due to the increased thermal expansion stress in the length direction of the steel rod when starting the electrolytic cell or during production. This is a structural design that facilitates the expansion and deformation of the circular cathode steel rod to the outside.

[0047] Example 2: Figure 11 and Figure 12 As shown in Embodiment 2 of the present invention, the upper part of the cathode carbon block of the aluminum electrolysis cell cathode conductive output device is a trapezoidal layered structure that decreases towards the middle, i.e., a trapezoidal structure that is high at both ends and low in the middle. That is, it is constructed by combining a trapezoidal cathode carbon block (1) and two circular copper-steel composite cathode steel rods (7). The two circular copper-steel composite cathode steel rods (7) are assembled into the cathode carbon block (1) through the cathode steel rod conductive connection holes at both ends of the cathode carbon block (1).

[0048] like Figure 13 and Figure 14 As shown, the cathode carbon block steel rod assembly described in Embodiment 2 has the following structural technical features: the upper part of its cathode carbon block (1) is a stepped structure with high ends and low middle, that is, the two ends of the cathode carbon block are a series of horizontal stepped structures that gradually decrease towards the middle. Circular cathode steel rod conductive connection holes with corresponding copper-steel composite structures are constructed on the cathode carbon block.

[0049] like Figure 15 and Figure 16As shown in Embodiment 2, the circular copper-steel composite cathode steel rod of the cathode carbon block steel rod assembly is constructed in two sections along its length. The conductive input section of the circular cathode steel rod uses a copper-steel composite structure, specifically a copper-clad steel structure. This design utilizes the superior conductivity and thermal expansion coefficient of copper compared to low-carbon steel to create a tighter conductive bond between the circular steel rod and the cathode carbon block. This reduces the resistance of this section of the cathode conductive output device in the aluminum electrolysis cell, allowing the cathode current within the aluminum melt layer of the aluminum electrolysis cell to be concentrated and output to this section. This eliminates or reduces the probability of horizontal current generation or weakens the impact of horizontal current fluctuations on the electrolyte layer. The conductive output section of the circular cathode steel rod uses low-carbon steel. This utilizes the relatively poor conductivity and relatively high resistance of steel to facilitate the transfer of cathode current from the upper part of the cathode carbon block to the lower resistance area inside the molten pool of the aluminum electrolysis cell. This allows for a balanced cathode current output according to an ideal, manually set state.

[0050] Implementation 3, such as Figure 17 As shown, because the molten pool structure of the aluminum electrolytic cell in this embodiment adopts the cathode carbon block steel rod group structure with adjustable cathode aluminum liquid current output position and direction as described in this invention, i.e., the cathode carbon block steel rod group structure described in Embodiment 1 or Embodiment 2, which constitutes the cathode conductive molten pool structure for constructing the aluminum electrolytic cell, the cathode current to be output and conducted in the aluminum liquid layer within the molten pool can be evenly distributed and orderly conducted to the main busbar of the cathode DC system outside the electrolytic cell according to the ideal process state set by the aluminum electrolytic cell cathode conductive output device. This reduces the horizontal current and aluminum liquid flow field generated within the aluminum liquid layer, thus reducing the erosion and impact wear on the side furnace walls and the upper surface of the cathode carbon blocks. It also reduces the negative impact of aluminum liquid layer fluctuations on the electrolyte layer, reducing the possibility of secondary oxidation of metallic aluminum liquid within the electrolytic cell. This achieves the goal of optimizing the aluminum electrolytic cell production process and reducing the power consumption in aluminum electrolytic production.

[0051] Implementation 4, such as Figure 18 As shown, in the specific implementation process, if the shape of the configured cathode carbon block is changed to the upper part of the existing technology to be set as a plane in the construction process of the cathode carbon block steel rod group of the cathode conductive output device of aluminum electrolysis cell, and only the aluminum electrolysis cell cathode conductive output device with threaded rod type circular cathode steel rod (5) or circular copper steel composite cathode steel rod (7) described in this invention is used, it will also fall within the protection scope of the invention patent technical solution of this patent application because the solution is an equivalent or inferior technical solution design.

[0052] Structural description of the circular aluminum-steel composite cathode rod: (See below) Figure 15 Figure 16 As shown, the threaded rod type circular cathode steel rod or circular copper-steel composite cathode steel rod of the present invention is designed with a circular cathode steel rod at the output end of the cathode conduction. During the construction of the cathode conduction molten pool structure of the aluminum electrolysis cell, it is necessary to connect it with the aluminum-steel composite connecting piece and the flexible busbar connecting device set on the outside of the aluminum electrolysis cell shell. Since the rectangular cross-section cathode steel rod of the prior art has been replaced with a circular cathode steel plate rod, the connection method must be changed. In order to facilitate the conductive welding connection between the circular cathode steel rod and the existing aluminum-steel composite explosion welded piece, a square transition connecting plate can be installed at the conductive output end of the circular cathode steel rod and then welded to the aluminum-steel composite transition connecting plate.

Claims

1. A cathode conductive output device for an aluminum electrolysis cell, comprising a cathode carbon block and a cathode steel rod with a circular cross-section, characterized in that: The cathode carbon block is constructed using a copper-steel composite circular cathode steel rod or a circular cathode steel rod with threaded rods.

2. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: Its copper The cathode current input section of the steel composite circular cathode rod is configured with a copper-steel composite structure; its conductive output section is configured with a smooth rod structure, and the outer diameter of the copper-steel composite circular cathode rod is configured to correspond with the inner diameter of the conductive connection hole of the cathode rod on the cathode carbon block.

3. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: Its thread The cathode current input section of the rod-type circular cathode steel rod is configured with an externally threaded rod structure, while its cathode current output section is configured with a smooth rod-type circular steel structure.

4. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: The upper surface of the cathode carbon block is configured as an inclined trapezoidal structure with high ends and low middle. The trapezoidal inclined surface can be configured as a sloping structure, or as a stepped platform or concave groove structure that gradually decreases towards the middle of the carbon block.

5. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: in The cathode carbon block has conductive connection holes for cathode steel rods extending towards the middle at both ends. These conductive connection holes are configured to correspond to either circular copper-steel composite cathode steel rods or threaded rod-type cathode steel rods.

6. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: in The cathode carbon block has conductive connection holes for cathode steel rods extending towards the middle at both ends. The two conductive connection holes for cathode steel rods in the middle part of the cathode carbon block are non-through, meaning that the middle part of the cathode carbon block is a solid structure.

7. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: The copper-steel composite structure at the cathode current input end of the copper-steel composite circular cathode steel rod should adopt a copper-clad steel composite structure configuration, or a configuration in which copper rods and low-carbon steel rods are directly connected.

8. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: In the aluminum liquid layer within the electrolytic molten pool constructed using the cathode conductive output device of the aluminum electrolytic cell, the cathode current to be output from the cathode aluminum liquid layer can be conductively output to the cathode busbar at the bottom outside the electrolytic cell by artificially setting a current output path with a relatively low resistance value of the cathode carbon block steel rod group.

9. The cathode conductive output device for an aluminum electrolysis cell according to claim 1, characterized in that: To facilitate the conductive welding connection between the circular copper-steel composite cathode steel rod or the threaded rod cathode steel rod and the aluminum-steel composite explosive welding sheet, a square transition connecting plate can be installed at the conductive output end of the circular cathode steel rod, and then welded to the aluminum-steel composite transition connecting plate.

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