Computer quenching method for aluminum cell anode effect

Abstract

The invention discloses a computer extinguishment method for the anode effect of an aluminum electrolytic bath. The method uses a computer to detect and judge the generation of the anode effect, automatically control and execute operations of adding alumina, ascending an anode, waiting and descending the anode and circularly execute the operations of ascending the anode, waiting and descending the anode until the anode effect is extinguished. The invention responds rapidly compared with a manual extinguishment method, can rapidly increase the concentration of alumina in an electrolyte solution below the anode, can impact an air film attached to the surface of the anode, is favorable to the acceleration of anode effect extinguishment and greatly shortens operation time needed for the anode effect extinguishment so as to greatly decrease energy consumption and greatly lighten the labor intensity of operators. The invention can improve the success rate of the anode effect extinguishment, prevents the electrolyte solution from overflowing out of the electrolytic bath, can not waste a great amount of heat and can prevent the high-temperature electrolyte solution from burning a bath cover.

Description

technical field [0001] The invention relates to a method for extinguishing the anode effect of an aluminum electrolytic cell, in particular to a computerized method for extinguishing the anode effect of an aluminum electrolytic cell. Background technique [0002] At present, in the industrial production process of metal aluminum, the anode effect often occurs in the aluminum electrolytic cell. The main manifestation of the anode effect is that the voltage of the aluminum electrolytic cell suddenly rises from the normal 4.2-4.4v to 30-60v, and an arc occurs on the anode, which suddenly increases the energy input into the electrolytic cell by several times, and the temperature of the electrolytic cell The main reason for its occurrence is that during the production of metal aluminum, the concentration of alumina in the electrolyte solution under the anode is too low, which destroys the stable power supply of the entire electrolysis series. There are two existing solutions. On...

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Problems solved by technology

The main manifestation of the anode effect is that the voltage of the aluminum electrolytic cell suddenly rises from the normal 4.2-4.4v to 30-60v, and an arc occurs on the anode, which suddenly increases the energy input into the electrolytic cell by several times, and the temperature of the electrolytic cell Rapid rise; the main reason for its occurrence is that in the production of metal aluminum, the concentration of alumina in the electrolyte solution under the anode is too low, which destroys the smooth power supply of the entire electrolysis series

There are two existing solutions. One is that when the anode effect occurs, the computer controlling the electrolyzer (i.e., the control box) will sound and flash an alarm to notify the operator to rush to the electrolyzer and add alumina to it. , and insert it under the anode with a wooden stick, and vigorously stir the aluminum liquid and the electrolyte solution to extinguish the anode effect, but this method is time-consuming, and a large amount of electric energy will be consumed during the stirring period, and the operator’s work intensity is relatively high, and This kind of violent stirring is easy to cause the loss of aluminum liquid in the electrolytic cell; in order to overcome the shortcomings of artificially extinguishing the anode effect, some domestic aluminum factories have adopted a method of lowering the anode to automatically extinguish the anode effect, and the method is mainly to use a computer to control the electrolytic cell , first add alumina, then lower the anode, wait for a while, then raise the anode

But this method has two disadvantages. One is that people usually think that the anode effect can be extinguished by reducing the pole distance by lowering the anode. However, after long-term practice, it is found that the success rate of using this method is not high; The anode is easy to extrude the high-temperature molten electrolyte solution and make it overflow the electrolytic cell, which not only loses the electrolyte solution, but also loses heat, and burns the tank cover