Method for real-time detection of concentration of aluminum oxide in aluminum cell
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A real-time prediction, aluminum electrolytic cell technology, applied in the direction of material resistance, can solve the problems of large error, difficult to combine alumina concentration and control parameters, and high cost
Active Publication Date: 2008-10-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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[0002] In the 1980s, people used the limiting current method to measure the concentration of alumina in aluminum electrolysis. At the same time, many scholars also studied the battery potential method to measure the concentration of alumina, but these methods have large errors, high cost,
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Embodiment 1
[0054] The purpose of predicting the concentration of alumina in the electrolytic cell is to accurately measure the concentration of alumina. 1# aluminum electrolytic cell, its series current is 150kA, and the feeding capacity of the feeder is 1.67kg after multiple calibrations. The internal time interval is 500s, and the feeding interval in the excess cycle is 180s. The tank control system is used to measure and control the feeding cycle and time of the electrolytic tank and measure the alumina concentration in the electrolytic tank.
[0055] In the short period, the alumina concentration values measured by the tank control system are: 2.69, 2.60, 2.53, 2.48; at the same time, the values are also analyzed by manual sampling: 2.70, 2.60, 2.52, 2.47; the measurement accuracy is excellent. It is less than 1%, which can fully meet the requirements of electrolytic aluminum production and control.
Embodiment 2
[0057] 2# aluminum electrolytic cell, its series current is 300kA, the feeding capacity of the feeder is 1.67kg after multiple calibrations, each electrolytic cell has 4 feeders, the number of feedings per day is 580 times within a week, and the short cycle The internal time interval is 400s, and the feeding interval in the excess cycle is 120s.
[0058] In the short period, the alumina concentration values measured by the tank control system are: 2.49, 2.45, 2.32, 2.28. ; At the same time, manual sampling analysis is also carried out, and the values are: 2.50, 2.42, 2.32, 2.27; the measurement accuracy is better than 1%, which can fully meet the requirements of electrolytic aluminum production and control.
[0059] Using the method to predict the concentration of alumina in the control electrolytic cell is beneficial to the production process and operators to grasp the operation status of the electrolytic cell in time, and is beneficial to the management and control of th...
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Abstract
A method for predicting the concentration of aluminum oxide in an electrobath relates to a real-time control for the concentration of aluminum oxide by using a bath control machine real-time measuring and displaying the concentration of aluminum oxide in an electrobath. The method is characterized in that: the real-time predicting process is using the bath control system and the voltage of the real-time detecting electrobath and system current and controlling the discharging interval, the time and the discharging capacity parameter to build an electrobath operating parameter and a relation mode of the aluminum oxide concentration and then predicting the concentration of aluminum oxide in an electrobath and displaying the real-time aluminum oxide concentration on the bath control machine. The method of this invention is suitable for the intermediate point type discharging pre-bake aluminum electrobath of the 70kA-350kA series. This method can control the prediction of the concentration of aluminum oxide in aluminum and it is beneficial to the production technique and operating stuff to timely know the operating state of the electrobath which is a benefit for the management and control for the production of electrolytic aluminum.
Description
technical field [0001] A method for real-time prediction of the alumina concentration in an aluminum electrolytic cell relates to a real-time measurement and display of the alumina concentration in the electrolytic cell by using a cell control machine, which is used for real-time control of the alumina concentration in the electrolytic cell. Background technique [0002] In the 1980s, people used the limiting current method to measure the concentration of alumina in aluminum electrolysis. At the same time, many scholars also studied the battery potential method to measure the concentration of alumina, but these methods have large errors, high cost, and operability. Factors failed to promote application. The question of alumina concentration has temporarily lost its urgency since the alumina concentration was controlled in terms of dR / dt. At present, almost all aluminum electrolytic cells with intermediate point feeding use dR / dt to control the alumina concentration. This c...
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