Cathode conductive output device of aluminum electrolysis cell

Abstract

A cathode conductive output device of an aluminum electrolysis cell is formed by combining a cathode carbon block and circular cathode steel bars, and is characterized in that cathode conductive output holes which are symmetrical left and right and are used for configuring and installing the circular cathode steel bars are formed in two side end sections of the cathode carbon block from outside to inside along the length direction of the cathode carbon block; the inner diameter of the circular cathode conductive output hole corresponds to the outer diameter of the circular cathode steel bar, so that an iron-carbon combined connection interface between the circular cathode steel bar and the cathode conductive output hole of the cathode carbon block can be used for connecting the circular cathode steel bar and the cathode conductive output hole of the cathode carbon block under the technical condition of electrolytic high-temperature working conditions by utilizing the characteristic that the thermal expansion coefficient of a metal material is greater than that of a carbon graphite carbon material; the tightly attached conductive connection is directly formed; therefore, the conduction and output function of the cathode current which needs to be conducted and output by an aluminum liquid layer in an aluminum electrolysis molten pool is achieved, and the cathode current is conducted to the aluminum-steel composite connecting piece and the cathode large bus through the cathode carbon block and the circular cathode steel bar.

Description

TECHNICAL FIELD

[0001] The application relates to a cathode conductive output device of an aluminum electrolysis cell, which is mainly used for the construction of a cathode molten pool structure of the aluminum electrolysis cell. BACKGROUND

[0002] The cathode conductive output device of the aluminum electrolysis cell is mainly composed of a cathode carbon block and a cathode steel rod, and has two main functions, i.e. a cathode current output from an aluminum liquid layer in an electrolysis molten pool is conducted to a cathode busbar outside a cell bottom, and the cathode conductive output device has the function of bearing the aluminum liquid and the electrolyte molten pool structure.

[0003] The existing cathode conductive output device of the aluminum electrolysis cell has the following construction process and structural features: first, a lower opening type recessed steel rod groove for mounting a rectangular cathode steel rod of a metal conductive output body is formed on the bottom of the cathode carbon block along the length direction of the cathode carbon block by means of planing and milling machining; during assembly, the cathode carbon block is inverted upside down, the recessed groove on the bottom of the cathode carbon block is opened upward, then the rectangular cathode steel rod is placed in the lower opening type recessed steel rod groove on the bottom of the cathode carbon block, and then a three-side contact conductive connection transition layer is formed between the inner wall of the recessed groove of the cathode carbon block and the outer wall of the cathode steel rod by means of pouring phosphorus pig iron or fixing carbon paste in the gap between the cathode carbon block and the cathode steel, so that the cathode steel rod and the cathode carbon block are connected together, and a cathode conductive output device structure part of the aluminum electrolysis cell is formed. Figure 1 ATTACHMENT Figure 2 ATTACHMENT Figure 3 ATTACHMENT Figure 4 The existing technology has the following defects:

[0004] (1) The carbon paste layer or the phosphorus pig iron conductive connection transition layer is arranged between the iron-carbon contact interface of the cathode carbon block and the cathode steel rod, and the structure configuration not only has complex construction process and high cost, but also causes the connection resistance value, i.e. voltage drop, between the cathode steel rod and the cathode carbon block to increase.

[0005] (2) The rectangular cathode steel rod arranged in the lower opening type recessed steel rod groove is prone to fracture at the corner of the lower opening type recessed steel rod groove under the technical condition of electrolysis thermal working condition, because the horizontal thermal expansion stress is greater than the horizontal stress of the side of the cathode carbon block, and the cathode conductive body is damaged and the conductive performance is reduced.

[0006] (Three) because the rectangular cathode steel rod set in the concave groove of the lower opening cathode steel rod is constrained by the cathode carbon block on three sides, and its bottom surface is not constrained; therefore, under the high temperature working condition load technical conditions of the electrolytic cell, due to the difference between the thermal expansion coefficients of the rectangular cathode steel rod and the cathode carbon block, the stability of the overall structure of the cathode carbon block and the cathode steel rod is poor.

[0007] (Four) because the rectangular cross section of the cathode steel rod concave groove of the lower opening is the same along the length direction of the cathode carbon block, therefore, the cathode steel rod with the same cross section shape can only be arranged along the length direction of the cathode carbon block. Thus, the distribution of the horizontal current in the aluminum electrolytic cell bath cannot be adjusted by adjusting the cross section of the cathode steel rod. Practical new type content

[0008] According to the design principle of the cathode conductive output body of the 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, conductive contact area, contact pressure and working temperature between the iron-carbon combined conductive interface, in order to overcome the above-mentioned defects of the existing technology aluminum electrolytic cell cathode carbon block steel rod group, the application discloses a new type of cathode carbon block structure of aluminum electrolytic cell cathode conductive output device, so as to form a new type of cathode conductive output device with excellent conductive performance, simple structure, stable performance and convenient adjustment of horizontal current in the aluminum electrolytic cell.

[0009] The aluminum electrolytic cell cathode conductive output device has the following structural characteristics: the rectangular cross section cathode steel rod of the metal conductive output component of the prior art cathode carbon block is replaced by the circular cross section cathode steel rod. That is, along the length direction of the cathode carbon block, there are left and right symmetrical cathode conductive output holes for arranging and installing the circular cathode steel rod from outside to inside, the outer diameter of the circular cathode steel rod corresponds to the inner diameter of the cathode conductive output hole arranged on the cathode carbon block, so that the outer surface of the circular cathode steel rod and the inner wall surface of the cathode conductive output hole of the cathode carbon block can directly form a tight conductive connection by using the thermal expansion coefficient of the circular cathode steel rod metal material, which is greater than the characteristic of the carbon cathode graphite carbon material, under the high temperature thermal working condition technical conditions of electrolysis; the cathode current to be conducted and output by the aluminum liquid layer in the aluminum electrolytic cell bath is directly conducted to the circular cathode steel rod through the cathode carbon block, and then the cathode current is conducted to the aluminum-steel composite connecting piece and the cathode current of the cathode busbar.

[0010] According to the technical scheme, in order to enhance the electric conductivity and mechanical structural strength of the cathode conductive output device, a cathode conductive output hole for mounting and arranging a circular cathode steel rod is arranged on the same horizontal center line in the length direction of the cathode carbon block; when designing and constructing, a plurality of cathode conductive output holes can be constructed on different positions of two side sections of the same cathode carbon block; the cathode conductive output holes are designed and arranged with different diameters; and the same diameter or different diameter variable diameter design is adopted in the same cathode conductive output hole.

[0011] According to the technical scheme, in order to reduce the manufacturing cost of the cathode conductive output device and facilitate optimization of the electric conductivity and mechanical structural strength of the cathode carbon block, the two cathode conductive output holes on the same center line of the two side surfaces of the same cathode carbon block are designed as blind holes, that is, the two cathode conductive output holes and the cathode steel rod arranged on the same straight line on the same cathode carbon block are spaced apart by a certain width horizontal interval, that is, the holes are not through.

[0012] According to the technical scheme, in order to optimize the electric conductivity and mechanical structural strength of the cathode conductive output device, the circular cathode steel rod of the cathode conductive output device is manufactured by using low-carbon steel or copper material, the diameter of the circular cathode steel rod of the cathode conductive output device is matched with the inner diameter size of the cathode conductive output hole arranged on the cathode carbon block, so as 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 can directly form a dense iron-carbon bonding interface conductive connection under the electrolysis working technical condition.

[0013] According to the technical scheme, in order to adjust the horizontal current in the aluminum electrolysis cell electrolysis bath and optimize the distribution of the magnetic flow field and the electric field, the circular cathode steel rod of the aluminum electrolysis cell cathode conductive output device is constructed by using copper-steel composite material, that is, the low-carbon steel is used to construct the conductive output end of the circular cathode steel rod, and the copper material is used to construct the conductive input end of the cathode steel rod; the threaded rod type penetrating conductive connection or the configuration mode of inserting the steel rod into the copper sleeve is used to construct and connect the connection part of the two sections of different materials of the cathode steel rod.

[0014] According to the technical scheme, in order to improve the electric conductivity of the aluminum electrolysis cell cathode conductive output device and realize the dense conductive connection between the circular cathode steel rod of the cathode conductive output device and the iron-carbon bonding interface of the cathode carbon block conductive output hole, a graphite electrode expansion conductive connection plug is arranged on the circular cathode steel rod; so as to use the high temperature technical condition during the start of the aluminum electrolysis cell to automatically fill the micro gap joint between the circular cathode steel rod and the cathode carbon block conductive output hole with the graphite expansion material, so as to optimize the conductive connection effect.

[0015] According to the technical scheme, in order to improve the conductive performance and stability of the mechanical structure of the cathode conductive output device of the aluminum electrolysis cell, a plurality of cathode conductive output holes with different diameters are arranged on the same cathode carbon block, and a plurality of circular cathode steel rods with different diameters are arranged, so as to improve and optimize the overall mechanical structure and conductive performance of the cathode conductive output device.

[0016] According to the technical scheme, a cathode conductive output device of an aluminum electrolysis cell is provided with a rectangular transition connecting block between the conductive output end of the circular cathode steel rod and the aluminum-steel composite explosive welding sheet with a rectangular cross section.

[0017] According to the technical scheme, in the overall assembly of the cathode conductive output device, two symmetrical circular cathode steel rods are respectively assembled in the corresponding cathode conductive output holes of the two side cross sections of the cathode carbon block, and then the conductive output end of the circular cathode steel rod is welded and conductively connected with the aluminum-steel composite explosive welding sheet.

[0018] According to the technical scheme, a cathode conductive output device of an aluminum electrolysis cell is provided with a rectangular transition connecting block between the conductive output end of the circular cathode steel rod and the aluminum-steel composite explosive welding sheet with a rectangular cross section.

[0019] According to the technical scheme, in the overall assembly of the cathode conductive output device, two symmetrical circular cathode steel rods are respectively assembled in the corresponding cathode conductive output holes of the two side cross sections of the cathode carbon block, and then the conductive output end of the circular cathode steel rod is welded and conductively connected with the aluminum-steel composite explosive welding sheet.

[0020] According to the technical scheme, one of the basic principles of the conductive arrangement of the cathode carbon block and the circular cathode steel rod of the cathode conductive output device of the aluminum electrolysis cell is that the steel material 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 realize the tight fitting of the iron-carbon interface conductive connection with the inner wall surface of the cathode conductive output hole on the cathode carbon block.

[0021] By reading the above technical solutions can be known: the cathode conductive output device of the application adopts a circular cathode steel rod structure, which has the following innovative points and technical advantages compared with the existing cathode conductive output device with a rectangular cathode steel rod structure:

[0022] By reading the above innovative technical solutions can be known: a cathode conductive output device for an aluminum electrolysis cell is designed to have a circularly closed cathode conductive output hole along the length of the cathode carbon block in the horizontal direction, which is not connected to the left and right ends, instead of the original technology of setting a lower open concave steel rod groove along the length of the cathode carbon block in the horizontal direction and being connected to the left and right sides of the cathode carbon block. The lower open concave steel rod groove in the middle of the cathode carbon block is canceled and is structured as a solid cathode carbon block connection structure. This not only improves the mechanical structural strength of the horizontal length direction of the middle of the cathode carbon block, but also prevents the corner of the side wall of the concave groove at the bottom of the cathode carbon block from being broken, improves the stability of the bottom structure of the cathode conductive output device, and prolongs the service life of the cathode conductive output device.

[0023] By reading the above technical solutions can be known: a cathode conductive output device for an aluminum electrolysis cell adopts a circular cathode steel rod and a side horizontal direction insertion method to connect and configure the cathode conductive output hole on the cathode carbon block and directly implement the iron-carbon interface connection between the two. The carbon ramming connection transition layer or the cast phosphorus pig iron conductive transition layer between the rectangular cathode steel rod and the concave steel rod groove is canceled. This not only reduces the construction cost of the cathode conductive output device and reduces the waste of material resources, but also reduces the resistance value voltage drop of the connection transition layer between the cathode steel rod and the cathode carbon block.

[0024] By reading the above technical solutions can be known: a cathode conductive output device for an aluminum electrolysis cell adopts a circular cathode steel rod and a cathode conductive output hole of the cathode carbon block for corresponding configuration, which can adjust the horizontal current distribution of the aluminum electrolysis cell and optimize the conductive performance of the aluminum electrolysis cell by adjusting the straight length of the cathode steel rod and adjusting the cross section ratio of the cathode carbon block and the cathode steel rod on the same center line. BRIEF DESCRIPTION OF DRAWINGS

[0025] The implementation technical solutions and features of the cathode conductive output device for an aluminum electrolysis cell of the application can be clearer by reading the brief description of the drawings and the description of the specific embodiments.

[0026] Figure 1 The structure diagram of the cathode carbon block of the prior art cathode conductive output device.

[0027] Figure 2 The side view sectional view of Figure 2 .

[0028] Figure 3Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0029] Figure 4 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 3 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0030] Figure 5 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0031] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 6 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 5 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0032] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 7 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0033] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 8 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 7 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0034] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 9 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 7 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0035] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 10 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0036] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 11 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 10 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0037] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 12 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0038] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 13 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0039] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 14 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0040] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 15 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0041] Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Figure 16 Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block. Assembling structure diagram of prior art cathode conductive output device cathode steel rod and cathode carbon block.

[0042] The figure shows: 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 connecting transition block, 5. Aluminum-steel composite explosive welding sheet, 6. Soft busbar connecting strip, 7. Cathode busbar, 8. Expanded graphite conductive joint bolt; 9. Lower opening concave cathode steel rod groove, 10. Rectangular cathode steel rod, 11. Ramming paste or phosphorus pig iron conductive transition connecting layer. Detailed Implementation

[0043] The technical solution of the cathode conductive output device shown in this invention will be more clearly described through the following embodiments.

[0044] Example 1: As Figure 5 Figure 6 As shown, the structural feature of the cathode carbon block 1 of the cathode conductive output device for an aluminum electrolytic cell according to the present invention is that two symmetrical cathode conductive output holes 2 for mounting the cathode metal conductive device are respectively provided on the left and right ends of the cathode carbon block 1 at the same horizontal height. The inner top ends of the two cathode conductive output holes 2 are separated by a certain width distance S at the center of the cathode carbon block 1. That is, the two cathode conductive output holes 2 on the same horizontal center line are not interconnected, i.e., they are non-through blind hole designs.

[0045] like Figure 7 , Figure 8 , Figure 9 As shown, in this embodiment 1, the diameter of the cathode conductive output hole 2, located at the same horizontal height as the cathode carbon block 1, corresponds to the diameter of the circular cathode steel rod 3 installed within the hole. The iron-carbon interface between the circular cathode steel rod 3 and the cathode conductive output hole 2 of the cathode carbon block forms a tight, conductive connection under electrolytic thermal conditions. That is, when designing the diameter of the cathode steel rod 3, the linear expansion coefficient of the circular cathode steel rod 3's metallic material should be considered, as it is greater than that of the graphite material in the cathode carbon block 1. When designing the assembly gap, the radial thermal expansion stress generated by the difference in the thermal expansion coefficient of the cathode steel rod 3 within the temperature range of 720℃ to 850℃ should be fully considered, as it affects the compressive stress on the inner wall of the cathode conductive output hole 2 of the cathode carbon block 1. In other words, it is necessary to achieve a tight conductive connection between the iron-carbon interface of the cathode steel rod 3 and the cathode carbon block 2, while ensuring that the radial thermal expansion stress of the cathode steel rod 3 does not cause mechanical structural damage to the cathode carbon block 1. This optimizes the conductivity and mechanical stability of the cathode conductor.

[0046] like Figure 10 Figure 11The cross section of the cathode steel rod 3 of the metal conductive output component of the cathode conductive output device described in the embodiment is circular, i.e. cylindrical. When assembling the cathode conductive output device, first, 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 using the method of side extrusion or insertion. If the cathode conductive output device adopts single steel rod or double steel rod configuration, the conductive output end of the cathode steel rod 3 can be directly welded and conductively connected with the aluminum-steel composite explosive welding sheet 5, so that the current output by the cathode conductor can be conducted to the cathode bus 7 through the aluminum bus connecting soft belt 6. If the cathode conductive output device adopts 2 or more circular cathode steel rods 3, in order to perfectly composite the cathode conductive output hole 2 with the rectangular aluminum-steel composite explosive welding sheet 5, a conductive transition connecting plate 4 can be added to the conductive output end of the cathode steel rod 3 by welding, and then the ends of the several circular cathode steel rods 3 are welded on the conductive transition connecting plate 4, and then connected with the aluminum-steel composite explosive welding sheet 5, and conducted to the cathode bus 7 through the aluminum bus connecting soft belt 6, to realize the cathode conductive output function.

[0047] Embodiment 2: as shown in Figure 10 , Figure 11 The cathode carbon block of the cathode conductive output device described in the embodiment is basically the same as that of embodiment 1, and the difference is that 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 kinds of conductive metal materials, the cathode conductive input end part 3-1 is made of copper metal material, and the cathode conductive output end part 3-2 is made of low carbon steel. Therefore, it is known that the diameter of the cathode conductive output hole 2 of the cathode carbon block 1 should also be divided into two parts, the diameter of the cathode steel rod conductive input end of the cathode conductive output hole 2, i.e. the copper metal material structure end, is relatively small, and the diameter of the cathode steel rod conductive output end of the cathode conductive output hole 2, i.e. the low carbon steel material structure end, is relatively large.

[0048] As shown in Figure 10 , Figure 11 In order to increase the conductive performance between the cathode steel rod and the iron-carbon combination interface of the cathode carbon block, and fill the micro cracks between the combination interface, an "expansion graphite conductive joint plug" 8 for the graphite electrode joint of the metallurgical electric arc furnace is installed on the circular cathode steel rod.

[0049] Embodiment 3: in order to adjust and optimize the conductive performance and mechanical structure performance of the cathode conductive output device, the cathode carbon block 1 and the cathode steel rod 3 structure configuration can be as shown in Figure 12 , Figure 13 or Figure 14The technical scheme is shown, that is, a plurality of cathode conductive output holes 2 with different diameters are arranged on the same cathode carbon block, that is, on the same cathode carbon block 1, and a plurality of circular cathode steel rods with different diameters are arranged on the same cathode carbon block. Under the technical condition that the overall conductive area of the circular cathode steel rod is unchanged, the overall conductive iron-carbon contact area of the cathode steel rod and the cathode carbon block is increased by reducing the diameter of the circular cathode steel rod and increasing the number of the circular cathode steel rods. The overall conductive performance of the cathode conductive output device is improved. Under the technical condition that the overall conductive area of the circular cathode steel rod is unchanged, a plurality of circular cathode steel rods are arranged at different height positions on the same cathode carbon block, so as to improve and optimize the overall mechanical structure of the cathode conductive output device. The stability of the cathode conductive output device is improved.

[0050] The cathode conductive output hole 2 designed and constructed on the cathode carbon block 1 of the cathode conductive output device is processed by drilling and milling process,

[0051] The circular cathode steel rod 3 of the cathode conductive output device is connected to the aluminum-steel composite explosive welding sheet by welding at the conductive output end, or the circular cathode steel rod is converted into a rectangular connecting piece through a low-carbon steel conductive overconnection block 4, and then connected to the rectangular aluminum-steel composite explosive welding sheet. That is, when assembling, the circular cathode steel rod is assembled into the cathode conductive output hole, then the conductive overconnection block is welded with the conductive output end of the circular cathode steel rod, and then welded and connected to the aluminum-steel composite explosive welding sheet, and then connected to the flexible bus connection plate strip. The cathode conductive output device can output the cathode current required by the cathode aluminum liquid in the aluminum electrolysis cell to the cathode bus 7 through the cathode carbon block 1, the circular cathode steel rod 3, the aluminum-steel composite explosive welding sheet 5 and the flexible bus connection plate strip 6. Figure 10 and Figure 11 as shown.

[0052] As shown in Figure 10 and Figure 11 When the cathode conductive output device needs to adjust the current in the aluminum electrolysis cell, the same circular cathode steel rod can be constructed by using copper and steel as two kinds of composite materials. The conductive output end of the circular cathode steel rod can be constructed by using low-carbon steel, and the conductive input end of the cathode steel rod can be constructed by using copper material. The connection between the two can be welded or threaded rod type insertion conductive connection as shown in Figure 15 or the steel rod is inserted into the copper sleeve as shown in Figure 16 .

Claims

1. An aluminum cell cathode conductive output device, which is constructed by combining a cathode carbon block and a round cathode steel rod, characterized in that Two side end sections of the cathode carbon block are configured with left and right symmetrical cathode conductive output holes for mounting and arranging the round cathode steel rod along the length direction of the cathode carbon block from outside to inside, the outer diameter of the round cathode steel rod corresponds to the inner diameter of the cathode conductive output hole arranged on the cathode carbon block, so that the outer wall surface of the round cathode steel rod and the inner wall surface of the cathode conductive output hole of the cathode carbon block can be directly connected in a dense conductive connection under the high-temperature working condition of the aluminum electrolysis cell, the characteristics that the thermal expansion coefficient of metal material is greater than that of carbon graphite carbon material can be used, the cathode current in the aluminum liquid layer in the aluminum electrolysis cell is conducted and output through the cathode carbon block and the cathode conductive output hole, and then the cathode current is conducted to the aluminum-steel composite connecting piece and the cathode current output function of the cathode busbar through the round cathode steel rod.

2. An aluminium cell cathode current collecting and outlet arrangement according to claim 1 characterised in that the Different positions of the two side sections of the same cathode carbon block can be configured with multiple cathode conductive output holes. The cathode conductive output hole can be designed with equal diameter or non-equal diameter, that is, the same cathode conductive output hole can be designed with equal diameter or variable diameter.

3. An aluminium cell cathode current collector and outlet arrangement according to claim 1 wherein the said current collector is formed from a plurality of elongate conductive elements. The two left and right symmetrical cathode conductive output holes configured on the same cathode carbon block are designed as blind holes, that is, there is a certain horizontal spacing in the center part of the cathode carbon block.

4. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised in that: The round cathode steel rod is configured with low-carbon steel material or copper conductive material.

5. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised in that: The round cathode steel rod can be configured with copper-steel composite material, that is, the low-carbon steel is used to configure the conductive output end of the round cathode steel rod, and the copper material is used to configure the conductive input end of the cathode steel rod; the threaded rod type insertion conductive connection or the configuration mode of inserting the steel rod into the copper sleeve can be used to connect the two sections of cathode steel rods with different materials.

6. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised by: In order to realize the dense conductive connection between the round cathode steel rod of the cathode conductive output device and the iron-carbon interface of the cathode carbon block conductive output hole, a graphite electrode expansion conductive connection plug is arranged on the round cathode steel rod; so as to use the graphite expansion material to automatically fill the micro gap between the round cathode steel rod and the cathode carbon block conductive output hole under the high-temperature technical condition of the start of the aluminum electrolysis cell, and to strengthen the conductive connection effect.

7. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised by: 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 arranged; so as to improve and optimize the overall mechanical structure and conductive performance of the cathode conductive output device.

8. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised by: A rectangular transition connecting block is arranged between the conductive output end of the round cathode steel rod and the rectangular aluminum-steel composite explosive welding piece.

9. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised by: When the cathode conductive output device is assembled, the two left and right symmetrical round cathode steel rods are respectively arranged in the corresponding cathode conductive output holes of the two side sections of the cathode carbon block after being pre-processed; and the conductive output end of the round cathode steel rod is welded and conductively connected with the aluminum-steel composite explosive welding piece.

10. An aluminium cell cathode current collector and outlet arrangement according to claim 1 characterised by: Its round cathode steel rod passes through the conductive excess connection block and is connected with the aluminum steel composite explosion welding sheet and the soft bus connection plate strip and the cathode bus. Or the cathode steel rod is directly connected with the aluminum steel composite explosion welding sheet, the soft bus connection plate strip and the cathode bus through conductive welding. Thus, a new type of aluminum electrolysis cell cathode conductive output device is formed, which can conduct the cathode current in the aluminum electrolysis cell to the round cathode steel rod through the cathode carbon block and the cathode conductive output hole, and then conduct the cathode current from the conductive output end of the cathode steel rod to the aluminum steel composite connection sheet and the aluminum electrolysis cell cathode bus.

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