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Online middle repairing method for electrolytic bath side part inner lining

A technology of electrolytic cell and side part, which is applied in the field of on-line intermediate repair of the side part of the electrolytic cell, which can solve the problems of waste of roasting start-up costs, waste of production time, damage to the bottom of the furnace, etc., so as to reduce the maintenance cost of the tank stop and prolong the service life , to reduce the effect of damage

Active Publication Date: 2009-05-27
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the maintenance cost during the shutdown of the tank is relatively high, and a large amount of production time will be wasted, and a large amount of roasting start-up costs will be wasted when the production is resumed again. destroy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A 300KA electrolyzer had extensive damage to the side lining. When repairing, draw out the electrolyte and aluminum liquid, so that the electrolyte level is 12cm, and the aluminum level is 12cm. Between the electrolyte and the side of the furnace, the surface shell material and the electrolyte block are compacted to form a barrier layer. Keep the voltage at 3.0-3.5V and the bath temperature at 940-970°C. Use an air pick to plan the covering material on the side of the electrolytic cell, the side of the electrolyte furnace, and the remaining side lining material to a depth of 32-35cm. Lay a layer of cold pound paste at the interface with a thickness of 3-5cm. Use side charcoal blocks with a thickness of 80 mm and a height of 300 mm, and place them on the cold paste one by one, with a gap of 1-3 mm. Updated side charcoal blocks throughout the sides. After the construction is over, raise the voltage to about 5V and gradually resume production.

Embodiment 2

[0020] A 150KA electrolyzer had extensive damage to the side lining. When repairing, draw out the electrolyte and aluminum liquid, so that the electrolyte level is 20cm, and the aluminum level is 15cm. Between the electrolyte and the side of the furnace, the surface shell material and the electrolyte block are compacted to form a barrier layer. Keep the voltage at 4.2-4.7V and the bath temperature at 960-990°C. Use an air pick to plan the covering material on the side of the electrolytic cell, the side of the electrolyte furnace, and the remaining side lining material to a depth of 32-35cm. Use a steel formwork for support, pound cold paste between the formwork and the side tank shell, and the thickness of the paste layer is 80-100mm. Construct in sections and sections until the entire side is rammed. After the construction is over, raise the voltage to about 5V and gradually resume production.

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Abstract

An electrolytic bath sideliner on-line second line maintenance method relates to aluminium cell maintenance method. It includes 1, adjusting electrolyte aluminum liquid horizontal total height to 35-15cm; 2, adjusting bath voltage to 1.8-5.5 v; 3, keeping cell temperature at 850-1100 degree centigrade; 4, pressing one barrier layer between electrolyte and furnace side; 5, using pneumatic tools to clean electrolytic bath side covered material, electrolyte furnace side, residuary side liner material, depth reaching 20-45cm, whole side being cleaned; 6, laying single-layer carbonaceous paste on cleaned interface with thickness of 1-10cm; 7, using charcoal block or carborundum block laying side of carbonaceous paste; 8, recovering production according to managing method after starting up electrolytic bath. Said invented method can replace whole sideliner material without electrolytic bath stopping operation.

Description

technical field [0001] The invention relates to an in-line repair method for the side lining of an electrolytic cell, which relates to a maintenance method for an aluminum electrolytic cell, which can completely renew the damaged side lining material of the electrolytic cell without stopping the cell. technical background [0002] Electrolysis is currently the only method for the industrial production of aluminum metal. This method uses molten cryolite as the electrolyte, carbon materials as the anode and cathode, and the side lining material of the furnace is generally made of carbonaceous materials or silicon carbide materials. Because the molten cryolite is extremely corrosive, in order to ensure the integrity of the side lining, in normal production, it is necessary to form a solid electrolyte layer between the side lining material and the molten cryolite, called the furnace side . However, due to changes and fluctuations in production, the side of the furnace is often...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 董少森罗英涛潘卫平焦庆国胡清韬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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