High-conductivity anode structure

Abstract

The utility model provides a high-conductivity anode structure which comprises a carbon block and an anode steel claw, the anode steel claw comprises a claw part, a carbon bowl is arranged on the carbon block, the claw part is inserted into the carbon bowl, a high-performance conductive film is embedded in the carbon bowl, and the high-performance conductive film is attached to the side wall of the carbon bowl. And a phosphorus pig iron casting body is cast between the high-performance conductive film and the claw part inserted in the carbon bowl. When the high-conductivity anode structure is assembled, the high-performance conductive film is embedded into the carbon bowl and is attached to the side wall of the carbon bowl, then the claw part of the anode steel claw is inserted into the carbon bowl, and molten phosphorus pig iron is cast between the high-performance conductive film and the claw part inserted into the carbon bowl; the high temperature of the molten phosphorus pig iron softens the high-performance conductive film, and when the molten phosphorus pig iron is cooled and solidified, the softened high-performance conductive film can be better in close contact with the solidified phosphorus pig iron casting body and the side wall of the carbon bowl, so that the iron-carbon pressure drop and the ineffective energy consumption of the high-conductivity anode structure in use are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of anode structures of aluminum electrolysis cells, and in particular to a high-conductivity anode structure. Background Art

[0002] Aluminum electrolytic cell anode is one of the important raw materials for electrolytic aluminum production. It acts as a conductor to conduct direct current into the electrolyte layer and also participates in the anode reaction of electrolysis as a carbon material. At present, the production of one ton of electrolytic aluminum consumes about 13,000 to 14,000 kWh of electricity. The energy consumption of electrolytic aluminum is mainly composed of the energy consumption of the anode part, the inter-electrode part, the cathode part and the busbar part.

[0003] The anode structure of an aluminum electrolytic cell in the prior art generally includes an anode guide rod, a steel-aluminum explosion welding block, an anode steel claw and a carbon block. A carbon bowl is provided on the carbon block, and the claw of the anode steel claw is inserted into the carbon bowl. The claw is connected to the carbon block by casting molten phosphorus pig iron in the carbon bowl. The energy consumption of the anode part is mainly caused by the Joule heat generated by the resistance of the anode. The anode voltage drop is mainly composed of the crimping voltage drop between the anode guide rod and the anode balance busbar, the anode guide rod voltage drop, the steel-aluminum explosion welding block voltage drop, the anode steel claw voltage drop and the iron-carbon voltage drop. In the electrolytic aluminum production process, the iron-carbon voltage drop of the anode of a 500kA aluminum electrolytic cell can reach 150-160mV, which is converted to an energy consumption of about 500kWh per ton of aluminum. The ineffective energy consumption caused by the iron-carbon voltage drop is relatively large. Therefore, it is necessary to improve the conductive structure or performance of the anode iron-carbon to reduce the ineffective energy consumption of the aluminum electrolytic cell.

[0004] The inventors have found through research that one of the reasons for the large pressure drop between iron and carbon is that the expansion coefficients of the cast molten phosphorus pig iron and the carbon block are different. When the molten phosphorus pig iron cools and solidifies, a gap will be generated between it and the carbon block, resulting in insufficient contact, which in turn leads to a large pressure drop between iron and carbon. Based on this research finding, the inventors made the present invention. Utility Model Content

[0005] The present application provides a highly conductive anode structure to solve the technical problems of large iron-carbon pressure drop and high ineffective energy consumption in the anode structure of aluminum electrolysis cells in the above-mentioned prior art.

[0006] The high-conductivity anode structure provided in this application adopts the following technical solutions:

[0007] A high-conductivity anode structure comprises a carbon block and an anode steel claw, wherein the anode steel claw comprises a claw portion, a carbon bowl is provided on the carbon block, the claw portion is inserted into the carbon bowl, a high-performance conductive film is embedded in the carbon bowl, the high-performance conductive film is bonded to the side wall of the carbon bowl, and a phosphorus pig iron casting is cast between the high-performance conductive film and the claw portion inserted into the carbon bowl.

[0008] The beneficial effects of the above technical solution are as follows: when assembling the high-conductivity anode structure of the present application, the high-performance conductive film is first embedded in the carbon bowl and made to fit the high-performance conductive film with the side wall of the carbon bowl, and then the claw of the anode steel claw is inserted into the carbon bowl, and then molten phosphorus pig iron is poured and filled between the high-performance conductive film and the claw inserted in the carbon bowl. The high temperature of the molten phosphorus pig iron will soften the high-performance conductive film, so that when the molten phosphorus pig iron cools and solidifies, the softened high-performance conductive film can better contact closely with the solidified phosphorus pig iron casting and the side wall of the carbon bowl, thereby reducing the iron-carbon pressure drop and invalid energy consumption of the high-conductivity anode structure of the present application when in use.

[0009] Furthermore, the electrical conductivity of the high-performance conductive film is greater than that of the phosphorus pig iron casting and the carbon block.

[0010] The beneficial effect is that the iron-carbon pressure drop can be further reduced.

[0011] Furthermore, the expansion coefficient of the high-performance conductive film is greater than that of the phosphorus pig iron casting and the carbon block.

[0012] The beneficial effect is that when the molten phosphorus pig iron cools and solidifies, the high-performance conductive film can be squeezed against the phosphorus pig iron casting and the side walls of the carbon block, thereby making the contact between the high-performance conductive film and the phosphorus pig iron casting and the side walls of the carbon block closer, further reducing the iron-carbon pressure drop.

[0013] Furthermore, the melting point of the high-performance conductive film is greater than that of the phosphorus pig iron casting.

[0014] Furthermore, the high-performance conductive film is a metal film.

[0015] Furthermore, the high-performance conductive film is a copper sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 Schematic diagram of the structure of a highly conductive anode according to an embodiment of the present application.

[0018] Description of reference numerals:

[0019] 1. Anode guide rod; 2. Steel-aluminum explosion welding block; 3. Carbon block; 4. Crossbeam; 5. Claw; 6. High-performance conductive film; 7. Phosphorus pig iron casting. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Those skilled in the art should know that the embodiments described below are part of the embodiments disclosed in this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0021] Reference Figure 1 The high-conductivity anode structure of the embodiment of the present application comprises an anode guide rod 1, a steel-aluminum explosion welding block 2, a carbon block 3 and an anode steel claw. The anode steel claw comprises a crossbeam 4 and a claw 5. A carbon bowl is provided on the carbon block 3, and the claw 5 is inserted into the carbon bowl. The anode guide rod 1 is an aluminum guide rod, and the anode guide rod 1 is welded and fixed to the aluminum block of the steel-aluminum explosion welding block 2, and the crossbeam 4 of the anode steel claw is welded and fixed to the steel block of the steel-aluminum explosion welding block 2.

[0022] Continue to refer to Figure 1 , a high-performance conductive film 6 is embedded in the carbon bowl, and the high-performance conductive film 6 is in contact with the circumferential side wall of the carbon bowl. The conductivity of the high-performance conductive film 6 is greater than that of the phosphorus pig iron casting 7 and the carbon block 3, the expansion coefficient of the high-performance conductive film 6 is greater than that of the phosphorus pig iron casting 7 and the carbon block 3, and the melting point of the high-performance conductive film 6 is greater than that of the phosphorus pig iron casting 7. In this embodiment, the high-performance conductive film 6 is a copper sheet. The phosphorus pig iron casting 7 is cast between the high-performance conductive film 6 and the claw 5 inserted in the carbon bowl.

[0023] The implementation principle of the high-conductivity anode structure of the embodiment of the present application is as follows: when assembling the high-conductivity anode structure of the present application, the high-performance conductive film 6 is first embedded in the carbon bowl and the high-performance conductive film 6 is made to fit the side wall of the carbon bowl, and then the claw portion 5 of the anode steel claw is inserted into the carbon bowl, and then the molten phosphorus pig iron is cast and filled between the high-performance conductive film 6 and the claw portion 5 inserted into the carbon bowl. The high temperature of the molten phosphorus pig iron will soften the high-performance conductive film 6, so that when the molten phosphorus pig iron is cooled and solidified, the softened high-performance conductive film 6 can better contact with the solidified phosphorus pig iron casting 7 and the side wall of the carbon bowl. Moreover, since the expansion coefficient of the high-performance conductive film 6 is greater than that of the phosphorus pig iron casting 7 and the carbon block 3, when the molten phosphorus pig iron is cooled and solidified, the high-performance conductive film 6 can squeeze the phosphorus pig iron casting 7 and the side wall of the carbon block 3, so that the high-performance conductive film 6 is in closer contact with the phosphorus pig iron casting 7 and the side wall of the carbon block 3, thereby reducing the iron-carbon pressure drop and ineffective energy consumption of the high-conductivity anode structure of the present application when in use.

[0024] The above is a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A high-conductivity anode structure, comprising a carbon block (3) and an anode steel claw, wherein the anode steel claw comprises a claw portion (5), a carbon bowl is provided on the carbon block (3), and the claw portion (5) is inserted into the carbon bowl, wherein: A high-performance conductive film (6) is embedded in the carbon bowl, the high-performance conductive film (6) is in contact with the side wall of the carbon bowl, and a phosphorus pig iron casting (7) is cast between the high-performance conductive film (6) and the claw (5) inserted in the carbon bowl.

2. The high conductivity anode structure according to claim 1, characterized in that: The electrical conductivity of the high-performance conductive film (6) is greater than that of the phosphorus pig iron casting (7) and the carbon block (3).

3. The high conductivity anode structure according to claim 2, characterized in that: The expansion coefficient of the high-performance conductive film (6) is greater than that of the phosphorus pig iron casting (7) and the carbon block (3).

4. The high-conductivity anode structure according to claim 3, characterized in that: The melting point of the high-performance conductive film (6) is greater than that of the phosphorus pig iron casting (7).

5. The high-conductivity anode structure according to claim 4, characterized in that: The high-performance conductive film (6) is a metal film.

6. The high-conductivity anode structure according to claim 5, characterized in that: The high-performance conductive film (6) is a copper sheet.

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