Research On Factors Influencing Service Life Of Prebaked Anode Aluminum Reduction Cell

The service life of the modern large-scale pre-baked aluminum electrolytic cell is one of the important comprehensive aluminum electrolytic production technical and economic levels. The span life of electrolyzer, not only related to the current efficiency of electrolyzer, power consumption, overhaul cost, the production cost of tons of aluminum electrolytic cell, more about the whole enterprise`s economic benefits and environmental benefits. Through a lot of reading literature, field investigation, combined with previous work with production practice. A more comprehensive study on the factors influencing the service life of aluminum electrolytic cell and response measures, the main research work is as follows:⑴Through the damage phenomenon of pre-baked cell system analysis, summarized the forms of cell damage. Analyzed the related to factors of cause cell damage.⑵According to different damage forms of electrolyzer, the damage mechanism of electrolytic tank is discussed, the main reason affecting electrolyzer breakage is the liquid penetration of the metal sodium, electrolyte and aluminum. Secondly, the existence of the physical fields contributed to the wear of aluminum electrolytic cell lining material, sodium, aluminum ion in the melt of discharge constitutes the electrochemical corrosion. Moreover, the thermal shock changes of electrolytic conditions of linings are caused by the electrolytic cell is an important cause of early damage. The systematic studies on the five factors of aluminum electrolytic cell breakage, the research involving electrolytic cell structure design, furnace construction materials quality, roasting starting method, electrolytic cell technical parameter management. Through the analysis of these factors, puts forward the method to extend the service life of aluminum electrolytic cell. Through the analysis of these factors, puts forward the method to extend the service life of aluminum electrolytic cell.⑶Systematic study of the five factors based on the damage of aluminum electrolytic cell, form design, material, structure of electrolytic cell, roasting starting method, operation management, production technology parameters and the application of new materials and other aspects, discusses the technical schemes to improve cell age.⑷The research and production practice show that aluminum reduction cell wall using Si3N4-SiC materials instead of common carbon material side, the cell side cooling effect is obvious. The application of TiB2 cathode coating in the electrolytic cell, can effectively prevent or delay the penetration of sodium and electrolyte, clean bottom, bottom pressure drop decreases, and reduce the impact of voltage, prevent early electrolytic cell damage, prolong the service life of the electrolytic cell. Roasting method still is given priority to with coke grain of roasting method. To counter the problem of current distribution, adjusted for current using a deflector. Improve the quality of anode, needs to improve the quality of raw materials and production equipment; optimize the formula; application of new technology.⑸The structure of the cell pressure distribution are simulated, the result showed that the cell structure of vertical stress is the cell shell structure of right angle type stress is most concentrated. Optimization for ship or fillet type structure, the stress values were significantly smaller.The research on pre-baked anode aluminum electrolysis productions, has certain guiding significances to prevent emergence of pot life short problems in Yulin New Materials Company.