Method of instantly adjusting energy balance of aluminium electrolytic tank according to alumina feeding quantity

An aluminum electrolytic cell and energy balance technology, applied in the field of aluminum electrolysis, can solve the problems of the bad influence of the current efficiency, the bad influence of the determination and control of the alumina concentration, and the increase

Inactive Publication Date: 2004-11-17
李德祥
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AI Technical Summary

Problems solved by technology

It has been seen in production that in the "waiting effect" cycle, due to the stop of feeding, the energy demand decreases, and the cell voltage does not decrease. It cannot return to normal within a few days. It is generally believed that the current efficiency will decrease by 1.5% for every 10°C increase in the electrolysis temperature, which obviously has a bad impact on the current efficiency. At the same time, the increase in temperature will also have adverse effects on the measurement and control of the alumina concentration influences

Method used

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Examples

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Embodiment Construction

[0094] Example 1: A 200KA intermediate automatic feeding prebaked aluminum electrolytic cell uses sandy alumina, the bottom of the cell is clean, the cell voltage is stable, the electrolysis temperature is 950°C, the current efficiency is 0.93, and the "normal feeding" cycle feeding interval is 110 Seconds, the feeding time interval given by a certain "underfeeding" cycle is 137 seconds, and the feeding time interval given by a certain "overfeeding" cycle is 92 seconds, no effect occurs 18 hours before the start of the "overfeeding" cycle, 48 hours "waiting effect" once. The maximum limit value of the tank voltage drop is given as 0.40 volts.

[0095] In this case, choose m 停 、m 欠 、m 过 Both are 0.9, K 停 、K 欠 、K 过 All are 0.9. Substitute the data into formula (1)(3) and round off below millivolts:

[0096] V Al2O3升温 =0.193+(950-950)×0.0002+(0.93-0.92)×0.21=0.195 volts

[0097] V Al2O3溶解 =0.229+(0.93-0.92)×0.25=0.232 volts

[0098] Use formula (5) to ca...

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Abstract

The invention relates to a method for instantly adjusting energy balance of aluminium electrolytic tank according to alumina feeding quantity which is adapted for automatic charging aluminium cell comprising, when the aluminum oxide charging quantity varies, adjusting the tank voltage instantaneously, in waiting effect cycle and artificial stop charging stage, lowering the tank voltage below the initialized voltage of the electrolytic tank, during insufficient charging cycle, lowering the tank voltage below the initialized voltage of the electrolytic tank by another value, during excess charging cycle, increasing the tank voltage above the initialized voltage of the electrolytic tank.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to a method for instantly adjusting the energy balance of an aluminum electrolytic cell with changes in the amount of alumina added. Background technique [0002] It is very important to maintain a normal energy balance in aluminum electrolytic cells. If the cell voltage is too high, the input energy is too much, the electrolysis temperature rises, and the current efficiency will decrease; if the cell voltage is too low, the input energy is insufficient, resulting in precipitation, which also reduces the current efficiency. So far, the energy balance of the aluminum electrolytic cell has been controlled only for a long period of average energy balance, which can be called the macroscopic energy balance. Adjust the setting voltage V setting of the aluminum electrolytic cell to achieve the purpose of maintaining energy balance. For changes in the short-term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
Inventor 李德祥
Owner 李德祥
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