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Method for controlling materials balance of electrolytic cell

A technology of material balance and electrolytic cell, which is applied in the field of material balance control of intermediate point-type blanking prebaked aluminum electrolytic cell to achieve the effect of stabilizing the operation of the electrolytic cell

Inactive Publication Date: 2008-10-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a considerable distance between the cell resistance change rate adjusted by this control strategy and the actual alumina concentration. Therefore, some scholars have pointed out that this control cannot be called alumina concentration control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1# aluminum electrolytic cell, its series current is 150kA, the electrolyte volume in the electrolytic cell is 4 tons according to calculation, the feeding amount of the feeder is 1.67kg after multiple calibrations, each electrolytic cell has 4 feeders, and the daily The number of feeding times is 290 times, the time interval in the under-quantity cycle is 500s, and the cutting interval in the excess cycle is 180s.

[0029] In the computer control system of the electrolytic cell, we set the target value of alumina concentration control as 2%, and the cell control system calculates the feeding period and discharge period of the electrolytic cell control by comparing the measured value of the alumina concentration with the target value. Material interval, control the cycle and interval of shelling and feeding cylinder action on the electrolytic cell to add alumina amount, so that the alumina concentration in the electrolytic cell is within the specified range. During the ...

Embodiment 2

[0033] 2# aluminum electrolytic cell, its series current is 300kA, the electrolyte volume in the electrolytic cell is estimated to be 8 tons, and the feeding amount of the feeder is 1.67kg after multiple calibrations. The number of blanking times is 580, the time interval in the under-period is 400s, and the interval between blanking in the over-period is 120s.

[0034] In the computer control system of the electrolytic cell, we set the target value of alumina concentration control as 1.9%. The cell control system calculates the feeding period and the discharge cycle of the electrolytic cell control by comparing the measured value of the alumina concentration with the target value. Material interval, control the cycle and interval of shelling and feeding cylinder action on the electrolytic cell to add alumina amount, so that the alumina concentration in the electrolytic cell is within the specified range. During the control process, manual sampling and analysis were carried ou...

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Abstract

A method for controlling an electrobath material balance relates to an aluminum electrolysis process, especially a material balance control method of the intermediate point type discharging pre-bake aluminum electrobath. t that: the control process is using the aluminum oxide concentration in the electrolyte measured by the bath control system soft measurement as the feedback value of the control of the aluminum oxide concentration in the bath control system; taking the setting value of the aluminum oxide concentration as the shifting condition of the aluminum oxide discharging period; the bath control system controls the discharging period of the aluminum oxide to achieve the aluminum oxide concentration controlled in a narrow range. The invention can effectively control the electrobath aluminum oxide concentration in a narrow range to make the material system of the electrobath in a stable which is beneficial for stabilizing the operation of the electrobath and saving energy and reducing the consumption for the production of electrolytic aluminum.

Description

technical field [0001] A method for controlling the material balance of an electrolytic cell relates to an aluminum electrolysis process, in particular a material balance control method for an intermediate point feeding prebaked aluminum electrolytic cell. Background technique [0002] The ultimate goal of aluminum electrolytic cell control is to make the electrolytic cell achieve better material balance and heat balance, and obtain better technical and economic indicators; the control of alumina concentration in the electrolytic cell is the key to the control of the electrolytic cell material balance. The traditional control method is based on the resistance change rate, using the control strategy of excessive, under, and normal feeding. It has been 20 years. This strategy has played a huge role in improving the technical and economic indicators of aluminum electrolysis. The current efficiency has increased from 89 % or so, increased to about 94%. People are accustomed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
Inventor 王鑫健张保伟刘彤
Owner GUIZHOU BRANCH CHINA ALUMINUM IND