Aluminum electrolysis process adjusting method

Abstract

The invention discloses a method for adjusting an aluminum electrolysis process, which can pre-judge the running trend of an electrolytic cell according to the magnitude of a voltage deviation value V deviation and a voltage noise deviation value N deviation, and further adopts a corresponding regulation and control means for the electrolytic cell, so that regulation and control can be carried out before the electrolytic cell fluctuates, the electrolytic cell is prevented from generating relatively large fluctuation, and the service life of the electrolytic cell is prolonged. The stable operation of the electrolytic bath is influenced; according to the method, the cell temperature, the electrolyte level, the aluminum level and the aluminum oxide blanking over-under ratio of the electrolytic cell are used as the judgment basis for judging whether the electrolytic cell is in the cold stroke or the hot stroke, the operation condition of the electrolytic cell can be comprehensively judged, and compared with judgment through a single parameter, the judgment result is more objective, reasonable and accurate; according to the method, the working voltage, the aluminum fluoride blanking condition and the aluminum discharge task load are taken as regulation objects instead of singly regulating the working voltage, so that the operation economy of the electrolytic cell can be improved on the premise of ensuring that the electrolytic cell is quickly regulated to a stable operation state.

Description

Technical field: [0001] The invention relates to the field of aluminum electrolysis, in particular to an aluminum electrolysis process adjustment method. Background technique: [0002] The process of aluminum electrolysis is to use molten cryolite as solvent, alumina as solute, carbon body as anode, and aluminum liquid as cathode. The process of electrochemical reaction on the inner two electrodes. The cathode product is aluminum liquid, which is extracted from the electrolytic cell by vacuum ladle and sent to the foundry. After being purified and clarified in the holding furnace, it is cast into aluminum ingots or directly processed into wire billet profiles, etc. [0003] The electrolytic production process is the process of converting electrical energy into heat. The heat is accompanied by the flow of the melt and conducts convective heat exchange with the lining structure, and then conducts heat conduction in the lining structure. After reaching the tank shell, it is di...

AI Technical Summary

Problems solved by technology

However, due to the maintenance of the pole distance, the interference of the magnetic field, and the deviation of the data acquisition and feedback of the tank control system, periodic misjudgments will occur in the adjustment of the tank control system, resulting in the energy balance of the electrolyzer often being broken. There are frequent problems of overcooling or overheating, which in turn affect the melting of alumina. For example, the electrolyte particles entrained with alumina enter the bottom of the tank from the electrolyte layer to form precipitation before it can melt. By passing through, a part of the vertical current is converted into a horizontal current, causing a large amount of heat to be dissipated from the side wall of the electrolytic cell, resulting in an increase in the voltage drop at the bottom of the cell, and a rebound in the cell voltage, resulting in fluctuations in electrolytic production and frequent redness of the side wall of the electrolytic cell. The production efficiency of the electrolytic cell is reduced, the voltage is abnormal, the furnace is deformed, and the cell is stopped

At present, the above situation will occur when the electrolyzer runs continuously for about 7 days, which seriously affects the smooth operation of the electrolyzer