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Reignition method for base aluminum groove

A secondary start-up and aluminum trough technology, applied in the field of secondary start-up of aluminum troughs, can solve problems such as increased labor intensity of workers, unstable technical conditions of the trough, redness of the side carbon blocks, etc.

Inactive Publication Date: 2008-09-24
山西华圣铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Take the 300kA aluminum electrolytic cell as an example.

[0010] After the electrolytic cell is powered off and the cell is shut down, clean up the electrode material and the aluminum block in the cell, repair the electrolytic cell, and perform conventional furnace loading and roasting; within 23 hours after the start-up, the roasting is transferred to the electrolytic cell After pouring aluminum liquid, the voltage rises to 6V within 2 hours of pouring aluminum liquid; after 2 hours after pouring aluminum, the voltage 6V is evenly reduced to 4.5V; within the next 24 hours, the control voltage is evenly reduced from 4.5V to 4.3V; within 24-48 hours, reduce the voltage evenly by 4.2V; within 48-72 hours, reduce the voltage evenly to 4.18V; within 72-96 hours, reduce the voltage evenly to 4.16V, and maintain the voltage at 4.10 within 96-120 hours V, and then enter post-management. During the start-up process, the furnace side is formed rapidly, and there is no large ar...

Embodiment 2

[0012] Take the 350kA aluminum electrolytic cell as an example.

[0013] After the electrolytic cell is powered off and the cell is shut down, clean the electrode material and the aluminum block in the cell, repair the electrolytic cell, and carry out conventional furnace charging and roasting; within 24 hours after the start-up, the roasting is transferred to the electrolytic cell After pouring aluminum liquid, the voltage rises to 6.5V within 3 hours of pouring aluminum liquid; after 3 hours after pouring aluminum, the voltage 6.5V is uniformly reduced to 4.8V; within the next 24 hours, the voltage is controlled from 4.8V uniformly Reduce the voltage to 4.5V; within 24-48 hours, reduce the voltage to 4.3V evenly; within 48-72 hours, reduce the voltage to 4.2V evenly; within 72-96 hours, reduce the voltage to 4.18V evenly; Keep 4.16V, and then enter the post-management. During the start-up process, the furnace side is formed rapidly, and there is no large area of ​​redness o...

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PUM

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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 to 6.5v in 2 to 3 hours after irrigating the aluminum liquid; uniformly decreasing the voltage 6 to 6.5v to 4.5 to 4.8v in 2 to 3 hours after irrigating the aluminum, controlling the voltage to be uniformly decreased from 4.5 to 4.8V to 4.3 to 4.5 V in 24 hours, then uniformly decreasing the voltage to 4.2 to 4.3V again in 24 to 48hours, then uniformly decreasing the voltage to 4.18 to 4.2V again in 48 to72hours again, then uniformly decreasing the voltage to 4.16 to 4.18V again in 72 to 96hours, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 吴智明赵天德张恒成徐卫东祈合生闫太网胡金平代军王群黄桥边韩国王科元段亚丽李芳块李登锋
Owner 山西华圣铝业有限公司