Cathode conductive output device of aluminum electrolysis cell

Abstract

The invention relates to a cathode conductive output device of an aluminum electrolysis cell, which aims to eliminate the negative influence of horizontal current of an aluminum liquid layer in an electrolytic bath of the aluminum electrolysis cell on an electrolysis production process, reduce the cathode voltage drop of the aluminum electrolysis cell, prolong the service life of the aluminum electrolysis cell and improve the current efficiency of the aluminum electrolysis cell. The aluminum electrolysis cell cathode conductive output device is formed by combining and configuring a cathode carbon block and a circular cathode steel bar, the upper part of the cathode carbon block is a trapezoidal section with two high ends and a low middle part, and the circular cathode steel bar is of a copper-steel composite structure or is configured by a threaded rod cathode steel bar; after the aluminum electrolysis cell cathode conductive output device is used for constructing an aluminum electrolysis cell electrolytic molten pool, cathode current to be output by a cathode molten aluminum layer in the electrolytic molten pool can pass through a manually set area with relatively low resistance value of a cathode carbon block steel bar group; and the cathode current is conducted and output to a cathode large bus at the bottom of the outer side of the aluminum electrolysis cell.

Description

[0001] Technical field: The cathode conductive output device of an aluminum electrolytic cell described in the present invention is mainly used for the construction of the cathode molten pool structure of an aluminum electrolytic cell.

[0002] Technical background: The cathode conductive output device of the aluminum electrolytic cell is mainly composed of a cathode carbon block and a cathode steel rod. It has two main functions: one is to conduct the cathode current output of the aluminum liquid layer in the electrolytic molten pool to the cathode busbar outside the bottom of the aluminum electrolytic cell; the other is to have the function of supporting the aluminum liquid and electrolyte liquid molten pool structure.

[0003] The construction process and structural features of the existing cathode conductive output device of aluminum electrolytic cells are as follows: first, at the bottom of the cathode carbon block, one to two downward-opening concave steel rod grooves for installing the rectangular cathode steel rod of the metal conductive output body are constructed along the length direction of the cathode carbon block by means of planing and milling machining. During assembly, the cathode carbon block is turned upside down, and the concave groove at the bottom of the cathode carbon block is opened upward. Then, the cathode steel rod with a rectangular cross section is placed in the downward-opening concave steel rod groove at the bottom of the cathode carbon block. Then, in the gap reserved between the cathode carbon block and the cathode steel, phosphorus pig iron or carbon paste is cast or fixed to form a three-sided contact conductive connection transition layer between the inner wall of the concave groove of the cathode carbon block and the outer wall of the cathode steel rod, so as to connect the cathode steel rod and the cathode carbon block structure together, so that it forms a structural component of the cathode conductor output device of the aluminum electrolytic cell. (See the attached manual) Figure 1 Attached Figure 2 and attached Figure 3 And attached Figure 4 ) The prior art mainly has the following defects:

[0004] (1) A carbon ramming paste layer or a phosphorus pig iron conductive connection transition layer is provided between the cathode carbon block and the cathode steel rod iron-carbon contact interface; this structural configuration not only has a complex construction process and high cost, but also leads to an increase in the connection resistance value, i.e., the voltage drop, between the cathode steel rod and the cathode carbon block.

[0005] (ii) Under the technical conditions of electrolytic heat working conditions, the rectangular cathode steel rod arranged in the concave groove of the cathode steel rod with a lower opening is prone to fracture at the corner of the concave groove of the cathode steel rod with a lower opening, because the horizontal thermal expansion stress is greater than the horizontal stress on the side of the cathode carbon block, resulting in damage to the entire cathode conductor and a decrease in the conductive performance.

[0006] (3) Since the rectangular cathode steel rod arranged in the cathode steel rod concave groove with a lower opening is constrained by the structural stress of the cathode carbon block on three sides and its bottom is open and not constrained; therefore, under the high-temperature working load technical conditions of the electrolytic cell, due to the difference in thermal expansion coefficients between the rectangular cathode steel rod and the cathode carbon block, the overall structural stability of the cathode conductor constructed by the cathode carbon block and the cathode steel rod will be poor.

[0007] (iv) Due to the lower opening of the cathode steel rod concave groove, the rectangular cross-section of the cathode carbon block is the same along the length direction. Therefore, only cathode steel rods with the same cross-section shape can be arranged along the length direction of the cathode carbon block. Therefore, it is not possible to adjust the distribution of horizontal current in the aluminum electrolytic cell molten pool by adjusting the cross-section of the cathode steel rod according to the technical conditions in the aluminum electrolytic cell.

[0008] Content of the invention: Based on the design principle that the conductive properties of the cathode conductive output body of an aluminum electrolytic cell, that is, the voltage drop of the cathode carbon block and steel rod group of the aluminum electrolytic cell is related to the material chemical composition of the conductive interface between the cathode carbon block and the cathode steel rod iron-carbon combination, the conductive contact area, the contact pressure between the two and the operating temperature, in order to overcome the above-mentioned defects of the prior art aluminum electrolytic cell introducing a carbon block and steel rod group, the present invention discloses a novel cathode carbon block structure of the cathode conductor of an aluminum electrolytic cell, so that on the basis of the cathode carbon block structure, a novel cathode conductive output device component of an aluminum electrolytic cell is constructed, which has excellent conductive properties, simple structure, stable performance and is convenient for adjusting the horizontal current in the aluminum electrolytic cell.

[0009] The main technical features of the structure of a novel cathode conductive output device for aluminum electrolytic cell described in the present invention are: the cathode carbon block of the prior art adopts a cathode steel bar with a rectangular cross section, and the cathode carbon block adopts a cathode steel bar with a circular cross section. That is, along the length direction of the cathode carbon block, from the outside to the inside, there are symmetrical cathode conductive output holes for configuring and installing the circular cathode steel bar, and the outer diameter of the circular cathode steel bar corresponds to the inner diameter of the cathode conductive output hole set on the cathode carbon block, so that the outer surface of the circular cathode steel bar and the inner wall surface of the cathode conductive output hole of the cathode carbon block can directly form a dense and fitted iron-carbon bonding interface for conductive connection under the technical conditions of high-temperature electrolytic thermal working conditions by utilizing the characteristics that the thermal expansion coefficient of the metal material is greater than that of the carbon graphite carbon material; so as to realize the conductive output function of the cathode current to be conducted and output by the aluminum liquid layer in the aluminum electrolytic cell molten pool, directly conducted to the circular cathode steel bar through the cathode carbon block, and then conducted to the aluminum-steel composite connecting piece and the cathode busbar by the circular cathode steel bar.

[0010] According to the above technical scheme: In order to enhance the conductive performance and mechanical structural strength of the cathode conductive output device, cathode conductive output holes for installing and configuring circular cathode steel rods are respectively arranged on the same horizontal center line in the length direction of the cathode carbon block; when designing and configuring, multiple cathode conductive output holes can be constructed at different positions of the two side sections of the same cathode carbon block; the cathode conductive output holes can adopt an equal diameter design or a non-equal diameter design; within the same cathode conductive output hole, an equal diameter setting or a variable diameter design can be adopted.

[0011] According to the above technical scheme; in order to reduce the manufacturing cost of the cathode conductive output device, facilitate the optimization of the structural design of the cathode carbon block, and increase its conductive performance and mechanical structural strength, two cathode conductive output holes are symmetrically expanded on the same center line at different positions of the two side sections of the same cathode carbon block, and are separated by a certain width horizontal spacing in the center of the cathode carbon block.

[0012] According to the above technical scheme, in order to optimize the conductive performance and mechanical structural strength of the cathode conductive output device, the circular cathode steel rod of the cathode conductive output device of the aluminum electrolytic cell is made of low-carbon steel or copper material, and the diameter of the circular cathode steel rod of the cathode conductive output device is mutually configured with the inner diameter of the cathode conductive output hole arranged on the cathode carbon block to ensure that the circumferential outer surface of the cathode steel plate and the inner surface of the cathode conductive output hole of the cathode carbon block directly form a dense iron-carbon bonding interface conductive connection under the technical conditions of the electrolysis working conditions.

[0013] According to the above technical scheme, in order to adjust the horizontal current in the electrolytic pool of an aluminum electrolytic cell and optimize the distribution of the magnetic flow field and the electric field, a circular cathode steel rod of a cathode conductive output device of an aluminum electrolytic cell can be constructed using two composite materials of copper and steel, that is, the conductive output end of the circular cathode steel rod is constructed using low-carbon steel, and the conductive input end of the cathode steel rod is constructed using copper material; at the connection between two sections of cathode steel rods of different materials, a threaded rod-type interlaced conductive connection or a steel rod inserted into a copper sleeve can be used for structural connection.

[0014] According to the above technical scheme, in order to improve the conductive performance of the cathode conductive output device of the aluminum electrolytic cell and realize the dense conductive connection between the circular cathode steel rod of the cathode conductive output device and the iron-carbon fitting interface of the conductive output hole of the cathode carbon block, a graphite electrode expansion conductive connecting plug is provided on the circular cathode steel rod; so as to optimize the conductive connection effect by automatically filling the microscopic gap between the circular cathode steel rod and the conductive output hole of the cathode carbon block with graphite expansion material under the high temperature technical conditions during the startup of the aluminum electrolytic cell.

[0015] According to the above technical scheme, in order to improve the conductive performance and mechanical structure stability of the cathode conductive output device of the aluminum electrolytic cell, multiple cathode conductive output holes with different diameters can be used on the same cathode carbon block, and multiple round cathode steel rods with different diameters can be used to configure them; so as to improve and optimize the overall mechanical structure and conductive performance of the cathode conductive output device.

[0016] According to the above technical solution, a cathode conductive output device for an aluminum electrolytic cell is provided with a rectangular transition connection block between the conductive output end of a circular cathode steel rod and an aluminum-steel composite explosive welding piece with a rectangular cross section.

[0017] According to the above technical scheme, a cathode conductive output device for an aluminum electrolytic cell, during the overall assembly of the cathode conductive output device, firstly, two sections of left-right symmetrical circular cathode steel bars are respectively assembled in the prefabricated corresponding cathode conductive output holes from the two side sections of the cathode carbon block; and then the conductive output end of the circular cathode steel bar is welded to the aluminum-steel composite explosion welding piece for conductive connection.

[0018] According to the above technical scheme, a cathode conductive output device for an aluminum electrolytic cell is provided, wherein the circular cathode steel bar is conductively welded to the aluminum-steel composite explosion welding piece (5) and the soft busbar connecting plate and the cathode busbar through a conductive transition connection block (4); or the circular cathode steel bar is directly conductively welded to the aluminum-steel composite explosion welding piece (5), the soft busbar connecting plate and the cathode busbar; thereby forming a novel cathode conductive output device for an aluminum electrolytic cell, which can conduct the cathode current in the aluminum electrolytic cell through the cathode carbon block and the cathode conductive output hole to the circular cathode steel bar, and then conduct it from the conductive output end of the cathode steel bar to the aluminum-steel composite connecting piece and the cathode busbar of the aluminum electrolytic cell.

[0014] According to the above technical solution, when the cathode conductive output device is assembled as a whole, the extrusion assembly method can be used to assemble the left and right circular cathode steel bars arranged on the same horizontal center line from the two side sections of the cathode carbon block into the corresponding prefabricated cathode conductive output holes. Thus, the cathode current conducted on the cathode carbon block is directly input and conducted to the cathode steel bar through the cathode conductive output hole by the circular cathode steel bar, and then conducted to the aluminum-steel composite connecting piece and the cathode busbar of the aluminum electrolytic cell from the conductive output end of the cathode steel bar.

[0015] According to the above technical scheme; one of the basic principles of configuring the cathode carbon block described in the present invention with a circular cathode steel rod is to utilize the characteristic that the thermal expansion coefficient of the circular cathode steel rod is greater than that of the graphite carbon material, so that the metal surface of the circular cathode steel rod after radial expansion can be tightly fitted with the inner wall surface of the cathode conductive output hole on the cathode carbon block to achieve conductive connection at the iron-carbon interface.

[0013] By reading the above technical solution, it can be known that the cathode conductive output device using a circular cathode steel bar structure of the present invention has the following innovations and technical advantages compared with the existing cathode conductive output device using a rectangular cathode steel bar structure:

[0014] By reading the above technical solution, it can be learned that the innovative cathode conductive output device will be arranged at the bottom of the cathode carbon block along the horizontal direction of the length of the cathode carbon block. The lower open concave steel rod groove with a full-length structure on the left and right sides of the cathode carbon block is changed to a design of a circularly closed cathode conductive output hole that is not connected to each other on the left and right ends along the horizontal direction of the length of the cathode carbon block. That is, the lower open concave groove in the middle of the cathode carbon block is cancelled, making it a solid structural connection structure. This can not only improve the mechanical structural strength of the horizontal length direction of the middle part of the cathode carbon block, but also prevent the corner fracture of the side wall of the concave groove at the bottom of the cathode carbon block, improve the stability of the bottom structure of the cathode conductive output device, and extend the service life of the cathode conductive output device.

[0015] By reading the above technical solution, we can know that the innovative cathode conductive output device adopts a circular cathode steel bar, which is connected to the cathode conductive output hole on the cathode carbon block by inserting it horizontally from the side, and directly implements the iron-carbon interface connection between the two. Thus, the carbon ramming connection transition layer or the cast phosphorus pig iron conductive transition layer between the rectangular cathode steel bar and the concave steel bar groove is eliminated. This not only reduces the construction cost of the cathode conductive output device and the waste of material resources, but also reduces the resistance value and voltage drop of the connection transition layer between the cathode steel bar and the cathode carbon block.

[0016] By reading the above technical solution, it can be learned that the innovative cathode conductive output device adopts a circular cathode steel rod and a cathode conductive output hole of the cathode carbon block for corresponding configuration. On the same center line, by adjusting the diameter of the cathode steel rod in sections and adjusting the cross-sectional ratio of the cathode carbon block and the cathode steel rod, the horizontal current distribution of the aluminum electrolytic cell can be adjusted to optimize the conductive performance of the aluminum electrolytic cell.

[0017] Description of the drawings: The technical scheme and technical features of the cathode conductive output device of an aluminum electrolytic cell described in the present invention will become clearer by reading the description of the drawings and the description of the specific embodiments.

[0018] Figure 1 This is a structural diagram of the cathode carbon block of the cathode conductive output device in the prior art.

[0019] Figure 2 for Figure 2 Side cross-sectional view of .

[0020] Figure 3 This is an assembly structure diagram of the cathode steel rod and cathode carbon block of the cathode conductive output device in the prior art.

[0021] Figure 4 for Figure 3 Side cross-sectional view of .

[0022] Figure 5 This is a schematic structural diagram of the cathode carbon block of Example 1 of the cathode conductive output device of the present invention.

[0023] Figure 6 for Figure 5 Side cross-sectional view of .

[0024] Figure 7 This is a schematic diagram of the structure of the aluminum cathode conductive output device of Example 2 of the present invention.

[0025] Figure 8 for Figure 7 Side view of

[0026] Fig. 9 for Figure 7 Top view of the cross section

[0027] Fig.10 This is a schematic elevation view of 1 / 2 of the structure of an aluminum cathode conductive output device constructed using round cathode steel bars made of two different materials, steel and copper, in Example 3 of the present invention.

[0028] Fig.11 for Fig.10 Schematic diagram of the structure of the cathode metal conductive device using steel and copper as the two materials to construct the circular cathode steel rod

[0029] Fig.12 The schematic diagram of the cross-sectional structure of a cathode carbon block of an aluminum cathode conductive output device of the present invention is configured with three circular cathode steel bars of different diameters.

[0030] Fig.13 A schematic diagram of the cross-sectional structure of a cathode carbon block of an aluminum cathode conductive output device of the present invention configured with four circular cathode steel bars of equal diameter.

[0031] Fig.14 The schematic diagram of the cross-sectional structure of the cathode carbon block of the aluminum cathode conductive output device of the present invention is configured with five circular cathode steel bars of different diameters.

[0032] Fig.15 Schematic diagram of the threaded rod connection construction method of the circular cathode steel using a copper-steel composite structure.

[0033] Fig.16 Schematic diagram of the construction method of the circular cathode steel adopting a copper-steel composite structure and its interlaced sleeve connection.

[0034] As shown in the figure: 1 cathode carbon block, 2 cathode conductive output hole, 3 circular cathode steel rod, 3-1 low carbon steel cathode steel rod segment, 3-2 copper steel rod segment, 4 rectangular conductive connection transition block, 5 aluminum steel composite explosion welding piece, 6 soft busbar connection belt, 7 cathode large busbar, 8 expanded graphite conductive joint bolt; 9 lower opening concave cathode steel rod slot, 10 rectangular cathode cathode steel rod, 11 ramming paste or phosphorus pig iron conductive transition connection layer.

[0035] Specific implementation method: The technical solution of the cathode conductive output device shown in the present invention is made clearer through the description of the following embodiments.

[0036] Example 1 Figure 5 Figure 6 As shown, the cathode carbon block (1) of the cathode conductive output device of the present invention is the main component of the cathode conductive output device of the aluminum electrolytic cell, and is characterized in that: at the left and right ends of the cathode carbon block (1) and on the horizontal line at the same height, two cathode conductive output holes (2) for configuring and installing the cathode metal conductive device are respectively provided, and the top ends of the two cathode conductive output holes are separated by a certain width S at the center of the cathode carbon block (1). That is, the two cathode conductive output holes (2) on the horizontal center line at the same height are not interpenetrating.

[0037] like Figure 7 , Figure 8 , Fig. 9 As shown, the diameter of the cathode conductive output hole (2) constructed on the same horizontal height line of the cathode carbon block (1) in this embodiment 1 is configured correspondingly to the diameter of the circular cathode steel rod (3) installed in the hole. The iron-carbon bonding interface between the circular cathode steel rod (3) and the cathode conductive output hole (2) of the cathode carbon block is a tightly fitting interface conductive connection under the electrolytic thermal working condition. That is, when designing the diameter of the cathode steel rod (3), it should be considered that the linear expansion coefficient of the metal material of the circular cathode steel rod (3) is greater than the linear expansion coefficient of the graphite material of the cathode carbon block (1). When designing the assembly gap, it should be fully considered that the change of the material temperature thermal expansion coefficient of the cathode steel rod (3) in the temperature range of 720°C to 850°C. The radial thermal expansion stress generated by the cathode carbon block (1) has an impact on the extrusion stress generated on the inner wall of the cathode conductive output hole (2); that is, the cathode steel rod (3) and the cathode carbon block (2) are closely fitted and conductively connected at the iron-carbon interface, and the radial thermal expansion stress of the cathode steel rod (3) does not cause mechanical structural damage to the cathode carbon block (1), so as to optimize the conductive performance and mechanical structural stability of the cathode conductor.

[0038] like Fig.10 Fig.11The cross section of the cathode steel rod (3) of the metal conductive output component of the cathode conductive output device described in this embodiment is circular, i.e. cylindrical. When assembling the cathode conductive output device, firstly, the circular cathode steel rod (3) is assembled into the corresponding cathode conductive output hole (2) from the end of the cathode carbon block (1) by side extrusion or insertion. If the cathode conductive output device adopts a single steel rod or double steel rod configuration, the conductive output end of the cathode steel rod (3) can be directly welded to the aluminum-steel composite explosion welding piece (5) for conductive connection configuration, so that the current output by the cathode conductor can be conducted to the cathode large busbar (7) through the aluminum busbar connecting soft belt (6). If the cathode conductive output device is configured with two or more circular cathode steel bars (3), in order to achieve a perfect conductive welding connection with the rectangular aluminum-steel composite explosive sheet (5), a conductive transition connecting plate (4) can be additionally configured at the conductive output end of the cathode steel bar (3) by welding, and then the ends of several circular cathode steel bars (3) are welded together on a conductive transition connecting plate (4), and then connected together with the aluminum-steel composite explosive welding sheet (5), and transmitted to the cathode large busbar (7) through the aluminum busbar connecting soft belt (6), so as to realize its cathode conductive output function.

[0039] Example 2: Fig.10 , Fig.11 As shown, the cathode conductive output device described in this embodiment has a cathode carbon block that is basically the same as that of embodiment 1, and its distinguishing technical features are: the same circular cathode steel rod (3) assembled in the cathode conductive output hole (2) of the cathode carbon block (1) is made of two conductive metal materials, and its cathode conductive input end portion (3-1) is made of copper metal material; its cathode conductive output end portion (3-2) is made of low carbon steel; from this point, it can be seen that the diameter of the cathode conductive output hole (2) of the cathode carbon block (1) should also be divided into two sections. The conductive input end of the cathode steel rod at the cathode conductive output hole (2), that is, the end constructed with copper metal material, has a relatively small diameter, and the conductive output end of the cathode steel rod at the cathode conductive output hole (2), that is, the end constructed with low carbon steel material, has a relatively large diameter.

[0040] like Fig.10 , Fig.11 As shown, in order to increase the conductivity between the cathode steel rod and the cathode carbon block iron-carbon bonding interface and fill the microscopic gap between the bonding interface, an "expanded graphite conductive joint plug" (8) for metallurgical arc furnace graphite electrode joints is installed on the circular cathode steel rod.

[0041] Embodiment 3: In order to adjust and optimize the conductive performance and mechanical structural performance of the cathode conductive output device, the cathode carbon block (1) and the cathode steel rod (3) structure configuration can be adopted as follows: Fig.12 , Fig.13 or Fig.14 The technical solution shown is to set a plurality of cathode conductive output holes (2) with different diameters on the same cathode carbon block, that is, on the same cathode carbon block (1), and to set a plurality of circular cathode steel rods with different diameters for configuration. For example, under the technical condition that the overall area of ​​the circular cathode steel rods remains unchanged, by reducing the diameter of the circular cathode steel rods and increasing the number of circular cathode steel rods, the overall conductive iron-carbon contact area between the cathode steel rods and the cathode carbon block is increased. The overall conductive performance of the cathode conductive device is improved; for example, under the technical condition that the overall area of ​​the circular cathode steel rods remains unchanged, on the same cathode carbon block, a plurality of circular cathode steel rods are progressively configured at different heights to improve and optimize the overall mechanical structure of the cathode conductive output device. It is used to improve the stability of the mechanism of the cathode conductive output device.

[0042] The cathode conductive output hole (2) designed and constructed on the cathode carbon block (1) of the cathode conductive output device of the present invention is processed by drilling and milling technology.

[0043] The circular cathode steel bar (3) of the cathode conductive output device described in the present invention is conductively connected to the aluminum-steel composite explosion welding piece by welding at the conductive output end, or the circular cathode steel bar is converted into a rectangular connector by a low-carbon steel conductive transition connection block (4), and then conductively connected to the rectangular aluminum-steel composite explosion welding piece. That is, during assembly, the circular cathode steel bar is assembled into the cathode conductive output hole, and then the conductive transition connection block is welded to the conductive output end of the circular cathode steel bar, and then conductively connected by welding to the aluminum-steel composite explosion welding piece, and then structurally connected to the soft busbar connecting plate strip; so that the cathode conductive output device can output the cathode current to be output by the cathode aluminum liquid in the aluminum electrolytic cell molten pool, which can be transmitted to the cathode large busbar (7) through the cathode carbon block (1), the circular cathode steel bar (3), the aluminum-steel composite explosion welding piece (5) and the soft busbar connecting plate strip (6). Fig.10 and Fig.11 shown.

[0044] like Fig.10 and Fig.11 As shown, when the cathode conductive output device needs to be able to adjust the current in the aluminum electrolysis molten pool, the same circular cathode steel bar can be constructed of copper and steel composite materials. The conductive output end of the circular cathode steel bar can be constructed of low-carbon steel, and the conductive input end of the cathode steel bar can be constructed of copper. The connection between the two can be welded or threaded rod-type interlaced conductive connection. Fig.15 As shown; or by inserting a steel rod into a copper sleeve to form a structural connection as shown Fig.16 shown.

Claims

1. A cathode conductive output device for an aluminum electrolytic cell is composed of a cathode carbon block and a round cathode steel rod, and is characterized in that: The two side end sections of the cathode carbon block are constructed with left-right symmetrical cathode conductive output holes for configuring and installing round cathode steel rods along the length direction of the cathode carbon block from the outside to the inside. The inner diameter of the round cathode conductive output hole is configured to correspond to the outer diameter of the round cathode steel rod, so that the iron-carbon bonding interface between the round cathode steel rod and the cathode conductive output hole of the cathode carbon block can directly form a tightly fitting conductive connection under the technical conditions of high-temperature electrolysis working conditions, utilizing the characteristics that the thermal expansion coefficient of the metal material is greater than that of the carbon graphite carbon material; so as to realize the conduction and output function of the cathode current to be conducted by the aluminum liquid layer in the aluminum electrolysis molten pool, through the cathode carbon block and the round cathode steel rod, to the aluminum-steel composite connecting piece and the cathode busbar.

2. A cathode conductive output device for an aluminum electrolytic cell according to claim 1, characterized in that: Multiple cathode conductive output holes and circular cathode steel rods can be constructed at different positions of the two side sections of the same cathode carbon block; the cathode conductive output holes and cathode steel rods can be designed with equal diameters or non-equal diameters; the same cathode conductive output hole can be designed with equal diameters or variable diameters.

3. The cathode conductive output device of an aluminum electrolytic cell according to claim 1, characterized in that: On the same cathode carbon block, two cathode conductive output holes and cathode steel rods which are symmetrically constructed on the same straight line are spaced horizontally at a certain width in the center of the cathode carbon block, that is, they are non-through arrangements.

4. The cathode conductive output device for an aluminum electrolytic cell according to claim 1 is characterized in that: The round cathode steel rod is made of low carbon steel or copper material.

5. The cathode conductive output device for an aluminum electrolytic cell according to claim 1 is characterized in that: The circular cathode steel rod can be made of a composite structure of copper and steel, that is, the conductive output end of the circular cathode steel rod is constructed with low-carbon steel, and the conductive input end of the cathode steel rod is constructed with copper material; at the connection between two sections of cathode steel rods of different materials, a threaded rod-type interlaced conductive connection can be adopted, or a steel rod can be inserted into a copper sleeve for structural connection.

6. The cathode conductive output device for an aluminum electrolytic cell according to claim 1, characterized in that: When the circular cathode steel rod can be made of copper and steel as a composite structure, the connection between the two sections of cathode steel rods of different materials can be made by threaded rod-type interlaced conductive connection, or by inserting the steel rod into the copper sleeve for structural connection.

7. The cathode conductive output device for an aluminum electrolytic cell according to claim 1 is characterized in that: In order to achieve a dense conductive connection between the circular cathode steel rod of the cathode conductive output device and the iron-carbon fitting interface of the conductive output hole of the cathode carbon block, a graphite electrode expansion conductive connecting plug is provided on the circular cathode steel rod; so that the microscopic gap between the circular cathode steel rod and the conductive output hole of the cathode carbon block, which is automatically filled with graphite expansion material, can be used under the high temperature technical conditions during the startup of the aluminum electrolytic cell to strengthen its conductive connection effect.

8. The cathode conductive output device for an aluminum electrolytic cell according to claim 1 is characterized in that: On the same cathode carbon block, multiple cathode conductive output holes with different diameters can be used, and multiple circular cathode steel rods with different diameters can be used for configuration; so as to improve and optimize the overall mechanical structure and conductive performance of the cathode conductive output device; a rectangular transition connection block is provided between the conductive output end of the circular cathode steel rod and the aluminum-steel composite explosion welding piece with a rectangular cross section.

9. The cathode conductive output device of an aluminum electrolytic cell according to claim 1, characterized in that: When assembling the cathode conductive output device as a whole, first assemble two sections of left-right symmetrical circular cathode steel rods in the prefabricated corresponding cathode conductive output holes from the two side sections of the cathode carbon block; then weld the conductive output end of the circular cathode steel rod to the aluminum-steel composite explosion welding piece for conductive connection.

10. The cathode conductive output device for an aluminum electrolytic cell according to claim 1, characterized in that: The circular cathode steel rod is connected to the aluminum-steel composite explosion welding piece (5), the soft busbar connecting plate and the cathode busbar by conductive welding through a conductive transition connection block (4); or the circular cathode steel rod is directly connected to the aluminum-steel composite explosion welding piece (5), the soft busbar connecting plate and the cathode busbar by conductive welding; thereby forming a novel aluminum electrolytic cell cathode conductive output device that can conduct the cathode current in the aluminum electrolytic cell through the cathode carbon block and the cathode conductive output hole to the circular cathode steel rod, and then conduct it from the conductive output end of the cathode steel rod to the aluminum-steel composite connecting piece and the aluminum electrolytic cell cathode busbar.

Images