Precise medium-and-small-repair cathode carbon block reinforcing and repairing structure for cathode of aluminum electrolysis cell

Abstract

The utility model discloses an aluminum electrolysis cell cathode precise medium and small repair cathode carbon block reinforcing and repairing structure which comprises a cathode carbon block body, a repairing groove is formed in the damaged portion of a cathode carbon lining of the cathode carbon block body, a prefabricated carbon block matched with the repairing groove in shape is embedded in the repairing groove, and the prefabricated carbon block is arranged in the repairing groove. A gap between the prefabricated carbon block and the repairing groove is filled with a conductive graphite adhesive layer; a plurality of reinforcing assemblies are arranged at the junction of the prefabricated carbon block and the repairing groove. The method comprises the following steps: processing a similar cathode carbon block material into a prefabricated carbon block, smearing a contact surface with a special high-temperature conductive adhesive, aligning the prefabricated carbon block with a repair groove, drilling and tapping at a junction position, and fastening the junction by adopting a high-temperature conductive graphite jackscrew smeared with special furnace building adhesive, so as to prevent the prefabricated carbon block from being separated from the repair groove.

Description

Technical fields:

[0001] This utility model relates to a cathode carbon block repair structure, and in particular to a cathode carbon block reinforcement and repair structure for precision minor repair of aluminum electrolytic cell cathodes. Background technology:

[0002] Aluminum electrolytic cells typically have a service life of 5-8 years, requiring major overhauls. This involves completely removing the lining material from the cell, creating hazardous waste. New refractory and conductive materials are then inserted through the holes and compacted with carbon (cathode carbon blocks) tamping paste to form a monolithic carbon container. Each major overhaul consumes a large amount of new refractory or conductive materials and generates substantial amounts of hazardous waste. During major overhauls, some cells suffer from severe localized wear on the bottom (commonly known as W-wear), and most carbon block surfaces are not completely worn, and the insulation and pressure-resistant materials are not entirely damaged. Replacing the damaged areas would reduce maintenance costs and time, and decrease hazardous waste generation. Patent CN 111270268 A discloses a method for precision minor repairs of aluminum electrolytic cell cathodes and a cathode carbon block repair structure, but it does not consider the secure fastening design between the prefabricated carbon blocks and the repair grooves, making it prone to detachment. Utility model content:

[0003] To address the above problems, the purpose of this utility model is to provide a structure for reinforcing and repairing the cathode carbon block in the precision minor repair of aluminum electrolytic cell cathodes.

[0004] This utility model is implemented by the following technical solution: a precision minor repair structure for cathode carbon blocks in aluminum electrolytic cells, comprising a cathode carbon block body, wherein a repair groove is provided at the damaged part of the cathode carbon lining of the cathode carbon block body, a prefabricated carbon block adapted to the shape of the repair groove is inlaid in the repair groove, and a conductive graphite adhesive layer is filled in the gap between the prefabricated carbon block and the repair groove; and a number of reinforcement components are provided at the joint between the prefabricated carbon block and the repair groove.

[0005] Furthermore, the reinforcement component includes a high-temperature conductive graphite set wire, and a plurality of threaded holes are tapped at the joint between the prefabricated carbon block and the repair groove, with the high-temperature conductive graphite set wire assembled in each of the threaded holes.

[0006] Furthermore, the surface of the high-temperature conductive graphite top wire is coated with a special furnace-building adhesive.

[0007] Furthermore, the spacing between two adjacent threaded holes is 100-500 mm. The spacing between the threaded holes is determined according to the size of the precast carbon block; the spacing can be larger when the precast carbon block is large.

[0008] The advantages of this utility model are: prefabricated carbon blocks are made from similar cathode carbon block materials, and special high-temperature conductive adhesive is applied to the contact surface. After aligning the prefabricated carbon block with the repair groove, drilling and tapping are performed at the joint position. High-temperature conductive graphite top screws coated with special furnace-building adhesive are used to fasten the joint, thus preventing the prefabricated carbon block from separating from the repair groove. Attached image description:

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of a carbon block reinforcement and repair structure for a precision minor repair of the cathode in an aluminum electrolysis cell.

[0011] Figure 2 An exploded view of a carbon block reinforcement and repair structure for a precision minor repair of an aluminum electrolytic cell cathode.

[0012] 1. Cathode carbon block body, 2. Repair groove, 3. Precast carbon block, 4. High-temperature conductive graphite set screw, 5. Threaded hole. Detailed implementation method:

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figure 1-2 As shown, a precision minor repair structure for cathode carbon blocks in aluminum electrolytic cells includes a cathode carbon block body 1. The damaged part of the cathode carbon lining of the cathode carbon block body 1 is provided with a repair groove 2. A prefabricated carbon block 3 adapted to the shape of the repair groove 2 is inlaid in the repair groove 2. The gap between the prefabricated carbon block 3 and the repair groove 2 is filled with a conductive graphite adhesive layer. Several reinforcement components are provided at the joint between the prefabricated carbon block 3 and the repair groove 2.

[0015] In one specific embodiment, the reinforcing component includes a high-temperature conductive graphite tap 4. Several threaded holes 5 are tapped at the joint between the prefabricated carbon block 3 and the repair groove 2, and a high-temperature conductive graphite tap 4 is installed in each threaded hole 5. The high-temperature conductive graphite tap 4 is a mushroom-shaped tap made of isostatic graphite material, with a flexural strength > 100 MPa.

[0016] In one specific embodiment, the surface of the high-temperature conductive graphite top wire 4 is coated with a special furnace-building adhesive, such as conductive graphite adhesive.

[0017] In one specific embodiment, the spacing between two adjacent threaded holes 5 is 100-500 mm. The spacing between the threaded holes is determined according to the size of the precast carbon block; the spacing can be larger when the precast carbon block is large.

[0018] A method for reinforcing and repairing a cathode carbon block for precision minor repairs in aluminum electrolytic cells: The damaged pit is ground smooth to form a repair groove 2. The repair groove 2 is then mapped using manual, electromechanical, or optical methods. The mapped pattern is then reverse-engineered to create a prefabricated carbon block 3 for repair. This prefabricated carbon block 3 is then processed using CNC technology, employing a material similar to the carbon at the damaged area (including discarded damaged cathode blocks). Once the prefabricated carbon block 3 arrives on-site, a special furnace-building adhesive is applied to its surface. When the adhesive layer is no longer sticky, it is manually lifted and placed using a vacuum suction cup. After leveling, threaded holes 5 are drilled at the seam between the prefabricated carbon block 3 and the repair groove 2. High-temperature conductive graphite set screws 4, coated with the special furnace-building adhesive, are then screwed into the threaded holes 5. The block is ready for use after the adhesive has solidified (6-24 hours). This method eliminates the need for specialized equipment to cut and excavate the damaged furnace surface, making it easy to operate and reducing manual labor and operational difficulty. It overcomes the problems of using all-steel drills, which make it difficult to extract the core due to the large cross-sectional area of ​​the middle core layer, and the uneven bottom after core extraction, making it difficult to seal and combine with the repair block. It also overcomes the difficulties in construction using large equipment such as double-disc diamond saws, which is not conducive to reducing manual labor.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An aluminum electrolysis cell cathode precision minor repair cathode carbon block reinforcement repair structure, characterized in that, It includes a cathode carbon block body, a cathode carbon inner lining damage site of the cathode carbon block body is provided with a repair groove, a prefabricated carbon block which is matched with the shape of the repair groove is inlaid in the repair groove, and an electrically conductive graphite adhesive bonding layer is filled in the gap between the prefabricated carbon block and the repair groove; a plurality of reinforcing assemblies are arranged at the joint of the prefabricated carbon block and the repair groove.

2. The aluminum electrolysis cell cathode precision minor and intermediate repair cathode carbon block reinforcement repair structure according to claim 1, characterized in that, The reinforcing assembly includes a high-temperature conductive graphite top wire, a plurality of threaded holes are tapped at the joint of the prefabricated carbon block and the repair groove, and the high-temperature conductive graphite top wire is assembled in each threaded hole.

3. The aluminum electrolysis cell cathode precision minor and intermediate repair cathode carbon block reinforcement repair structure according to claim 2, characterized in that, The surface of the high-temperature conductive graphite top wire is coated with special furnace building glue.

4. The aluminum electrolysis cell cathode precision minor and intermediate repair cathode carbon block reinforcement repair structure according to claim 2, characterized in that, The interval between two adjacent threaded holes is 100-500 mm.

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