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High-efficiency and energy-saving starting method for heat flow coke calcination in aluminum electrolysis

A high-efficiency energy-saving, roasting start-up technology, applied in the field of aluminum electrolysis production process, can solve the problems of increased monitoring and maintenance intensity of employees, shortened service life of electrolytic cells, and low labor intensity, so as to improve energy utilization rate, reduce possibility, and reduce The effect of labor intensity

Active Publication Date: 2013-05-08
YUNNAN ALUMINUM
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AI Technical Summary

Problems solved by technology

Most domestic aluminum electrolysis enterprises have adopted the cavity circulation roasting method, which does not lift the anode to start the roasting. The process is simple and the labor intensity is low, but there are still some areas that need to be further improved, such as the tank bottom, tank shell, square steel after starting The temperature "three high" problems shorten the service life of the electrolytic cell and bring great safety hazards, and the intensity of monitoring and maintenance of employees increases, especially for curved cathode electrolytic cells, this situation is extremely prominent

Method used

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  • High-efficiency and energy-saving starting method for heat flow coke calcination in aluminum electrolysis

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Embodiment Construction

[0024] 1. Filling of semi-silo material of aluminum electrolytic cell

[0025] In the process of filling the electrolytic cell, the half-bunk electrolyte powder is filled, which not only ensures that there is enough molten electrolyte to fill the cathode cracks, but also protects the cathode from excessive expansion and deformation caused by excessive thermal shock. At the same time, half-bunk filling ensures coke particles The generated heat flow flows in the sealed groove to strengthen the roasting of the side extension legs and the carbon block.

[0026] 2. Start 8 hours after lifting the anode

[0027] After the electrolytic cell was energized and baked for 72 hours, the anode was lifted for 8 hours, and the start-up was performed after 8 hours. Starting up after 8 hours of lifting the anode makes the cathode heating gradient of the electrolytic cell more reasonable, reduces the impact of thermal stress on the cathode, reduces the possibility of early damage to the cathode, and ...

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Abstract

The invention discloses a high-efficiency and energy-saving starting method for heat flow coke calcination in aluminum electrolysis. The method comprises the following steps of: 1), when filing an electrolytic bath, filling a half of a cabin with electrolyte powder; 2), after the electrolytic bath is electrified for calcinating for 72 hours, executing the operation of lifting a positive pole for 8 hours; 8 hours later, starting the aluminum electrolytic bath; 3), rapid adjustment of the control technology: (1) adjustment of electrolyte constituent, (2) voltage adjustment and (3) aluminum level adjustment. By the rapid adjustment to the control technology, within 30 days, the bath voltage drops to the normal production standard, the aluminum level reaches more than 30cm, and the normal production condition is realized. The method not only guarantees enough molten electrolyte for filing the negative pole gap, but also protects the negative pole from oversize expansion and deformation caused by overlarge heat shock, avoids waste of electric energy and improves the energy utilization rate.

Description

Technical field [0001] The invention relates to the technical field of aluminum electrolysis production technology, in particular to an aluminum electrolysis high-efficiency energy-saving heat flow coke particle roasting start method. Background technique [0002] For electrolytic aluminum plants, an important factor that affects electrolytic production costs and economic benefits is the life of aluminum electrolytic cells. The firing start method is undoubtedly one of the important factors that affect the life of the electrolytic cell. Most domestic aluminum electrolysis enterprises have adopted the cavity circulation roasting method, which does not lift the anode roasting to start. The process is simple and the labor intensity is low. However, there are also some areas that need further improvement, such as the bottom of the tank, the tank shell, and the square steel after the start. The "three high" temperature problems have shortened the life of the electrolyzer and brou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 李俊杨国荣刘强李绍文丁晓亮詹正学方国晟白恩贵李正权陈麟江寸跃祖
Owner YUNNAN ALUMINUM
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