Reignition method for base aluminum groove

Abstract

A secondary starting method for a seat aluminum slot relates to a secondary starting method of an electrobath during an aluminum electrolyzing manufacture process which is characterized by after carrying out washing, complementing, arranging into a furnace and baking on the electrobath in turn, irrigating an aluminum liquid into the electrobath in 23 to 24 hours during transferring from baking to starting and the voltage rises to 6-6.5v in 2 to 3 hours after irrigating the aluminum liquid; uniformly decreasing the voltage from 6-6.5v to 4.5-4.8v in 2 to 3 hours after irrigating the aluminum, controlling the voltage to be uniformly decreased from 4.5-4.8V to 4.3-4.5 V in 24 hours, then uniformly decreasing the voltage to 4.2-4.3V again in 24 to 48 hours, then uniformly decreasing the voltage to 4.18-4.2V again in 48 to72 hours again, then uniformly decreasing the voltage to 4.16-4.18V again in 72 to 96 hours, maintaining the voltage in 4.10 to 4.16V in 96 to 120 hours, then entering into an anaphase management. In the invention, the voltage is below 6 to 6.5 during the day after starting to irrigate the aluminum liquid and the voltage is fast decreased to a normal voltage in five days; during the starting process, a furnace wall can be formed fast, thus solving the problem of large area rubefaction.

Description

technical field [0001] The invention relates to a secondary start-up method for an aluminum seat tank, and relates to a secondary start-up method for an electrolytic tank in an aluminum electrolytic production process. Background technique [0002] The secondary start-up of aluminum electrolytic cells is an important link in the electrolysis production process of modern large-scale aluminum electrolysis. The quality of the secondary start-up of the aluminum electrolytic cell plays a decisive role in the influence of the life of the cell. In order to prolong the life of the electrolyzer and reduce economic loss, high safety and reliability are required in the start-up process. The traditional method of starting the secondary roasting of the seat aluminum tank is usually to use ordinary cryolite to charge the furnace and roast the aluminum liquid. During the operation, the electrolyte is cleared out, the aluminum block in the tank is kept, and it is directly energized and ro...

AI Technical Summary

Problems solved by technology

Because there are many cracks in the cathode lining of the tank during the second start-up, the traditional roasting method will cause a strong thermal shock to the cathode lining, which will easily lead to anode depolarization and tank leakage. During the start-up process, soda ash must be added continuously to adjust the molecular ratio and increase It increases the labor intensity of the workers, and also leads to the instability of the technical conditions of the tank, and also causes a large area of ​​redness on the side carbon block, which reduces the life of the electrolytic tank