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Aluminum electrolysis cell cathode precision medium and small repairing method and cathode carbon block repairing structure

An aluminum electrolytic cell and cathode carbon block technology are applied in the method and cathode carbon block repairing structure, and in the field of precision small and medium repair of the cathode of aluminum electrolytic cell, which can solve the problem of the large difference of the paste resistivity of the cathode body and the uneven current distribution of the coke particle roasting tank. It can reduce the problem of uneven current distribution in the electrolytic cell, and achieve the effect of reducing efflux and processing capacity, uniform current distribution, and reducing maintenance costs.

Pending Publication Date: 2020-06-12
内蒙古五色石炉窑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Insufficient strength of the repaired part with paste, the difference between the resistivity of the paste and the cathode body is large, and the tank is usually damaged soon after starting
[0006] 2. After the refractory material repairs the damaged part of the cathode carbon material, the place is usually non-conductive, which increases the problem of uneven current distribution in the electrolytic cell and poor operating condition of the cell
[0007] 3. The erosion of some cathode steel rods affects the current distribution. Failure to repair will have a negative impact on the condition of the tank after start-up
[0008] The above repair method is easy to cause a series of problems such as uneven current distribution and local overheating when using the coke particle roasting tank, and it is more difficult to start the roasting

Method used

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  • Aluminum electrolysis cell cathode precision medium and small repairing method and cathode carbon block repairing structure
  • Aluminum electrolysis cell cathode precision medium and small repairing method and cathode carbon block repairing structure

Examples

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Embodiment 1

[0042]Example 1: For a 600KA aluminum electrolysis series, the electrolytic cell adopts the technology of fully graphitized cathode ferrophosphorus casting cathode steel rod. Due to the formation of large erosion pits at the cathode at the bottom of the tank, which affects safety in production, the tank was stopped for repair. After the tank was stopped, the electrolyte and metal aluminum on the surface of the cathode were cleaned. It was observed that the diameter of the largest erosion pit was about 400mm, and the depth was 220mm. There was no obvious damage to the cathode steel rod. Drill the damaged part with a 450mm diameter hollow drill to a depth of 260mm on the surface of the cast iron phosphorus. After crushing, take out the center drilled part, and use a mill to smooth the bottom of the hole to form a cylindrical repair groove. Graphitized cylindrical prefabricated carbon block with a diameter of 449mm and a height of 260mm is coated with graphite conductive adhesive...

Embodiment 2

[0043] Example 2: A 400KA electrolysis series electrolytic cell uses steel rods to paste graphite cathodes and steel rods. Due to an accident, the electrolytic cells need to be re-started after minor repairs.

[0044] 1. Use composite blocks to repair the damage where the upper surface area of ​​the erosion is large and the middle pit is deep. Such as figure 1 As shown in A in the middle: first cut the first layer of cylindrical repair grooves with a diameter of 350mm and a depth of 150mm at the damaged part. After the bottom of the groove corresponding to the first layer of cylindrical repair groove is calibrated to correspond to the position of the deep hole, the first cylindrical prefabricated carbon block with a diameter of 349mm and a length of 150mm is prefabricated, and the surface of the first cylindrical prefabricated carbon block is coated with metal conductive paste After curing, insert the first cylindrical prefabricated carbon block into the first layer of cylind...

Embodiment 3

[0053] Embodiment 3: as figure 1 As shown, a cathode carbon block repair structure for precise medium and small repair of the cathode of an aluminum electrolytic cell includes a cathode carbon block body 1, and the damaged part of the cathode carbon lining of the cathode carbon block body 1 is provided with a regular-shaped repair groove 2 for repairing The groove 2 is inlaid with a prefabricated carbon block 3 adapted to the shape of the repaired groove 2, and the gap between the prefabricated carbon block 3 and the repaired groove 2 is filled with a conductive graphite adhesive layer or a metal conductive paste adhesive layer .

[0054] Such as figure 1 As shown at A, the repaired groove 2 includes two layers of regular-shaped holes.

[0055] The first layer of cylindrical repair groove is a cylindrical hole with a diameter of 350mm and a depth of 150mm. The first cylindrical prefabricated carbon block with a diameter of 349mm and a length of 150mm is embedded in the firs...

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Abstract

The invention discloses an aluminum electrolysis cell cathode precision medium and small repairing method and a cathode carbon block repairing structure. The method comprises the following steps that(1) after an aluminum electrolysis cell is stopped, the damage condition of an aluminum electrolysis cell cathode is checked, wherein the damage condition of the aluminum electrolysis cell cathode comprises an erosion pit caused by the surface of a local cathode carbon block and a cathode erosion pit eroded by a local steel bar; and (2) determining a medium and small repair scheme according to thedamage condition of the aluminum electrolysis cell. The repairing structure comprises a cathode carbon block body, wherein a repairing groove in a regular shape is formed in the damaged part of a cathode carbon lining of the cathode carbon block body, and a prefabricated carbon block matched with the repairing groove in shape is embedded in the repairing groove. Through adopting the aluminum electrolysis cell cathode precision medium and small repairing method, the damaged part is repaired, a good repairing effect is achieved, the repairing time is short, the repairing cost is low, and the method is very suitable for repairing cell shutdown caused by physical and technical life.

Description

Technical field: [0001] The invention relates to a method for small and medium repair of an aluminum electrolytic cell and a repair structure, in particular to a method for precise small and medium repair of the cathode of an aluminum electrolytic cell and a repair structure of a cathode carbon block. Background technique: [0002] The overhaul of traditional aluminum electrolytic cells is mostly due to excessive pressure drop at the bottom of the furnace, heaving of the bottom of the furnace, low current efficiency, poor technical and economic indicators, and economic shutdown and overhaul that cannot sustain profitability. The overhaul of the traditional aluminum electrolytic cell is to replace all the cathode linings, which not only has high maintenance costs and long construction time, but also produces nearly 100 tons of hazardous waste. Taking the overhaul of a 400Ka electrolyzer as an example, the overhaul cost is more than 1.5 million yuan, including the cost of haza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
CPCC25C3/08
Inventor 不公告发明人
Owner 内蒙古五色石炉窑有限公司