Prebaked anode aluminum electrolytic bath

Abstract

The invention discloses equipment adopting a Hall-Heroult fused salt electrolysis process to produce aluminum-an aluminum electrolytic bath, in particular to an above 400kA degree of prebaked anode aluminum electrolytic bath. The prebaked anode aluminum electrolytic bath comprises an upper structure, a cathode structure and a cathode bus bar, the upper structure comprises a crossbeam, a door-typecolumn, an anode carbon block group, a large anode bus bar, an anode lifting mechanism, and a shell breaking blanking system and a closed smoke exhaust system, and the cathode structure comprises a bath shell and a lining, wherein the anode lifting mechanism adopts a ball screw and set square structure; the closed smoke exhaust system is a closed smoke exhaust system of lower flue section; a cathode carbon block is in a structure of graphite carbon block with width cathode; the bath shell is in a welded cradle bath shell structure; and the cathode bus bar is an unsymmetrical cathode bus bar. The prebaked anode aluminum electrolytic bath improves the synchronization and the heat dissipation of the lifting mechanism, reduces the frictional head losses and enhances the uniformity of smoke exhaust, and the anode current density of the electrolytic bath is improved.

Description

technical field [0001] The invention relates to an aluminum electrolytic cell, which is an equipment for producing aluminum by Hall-Elu molten salt electrolysis method, in particular to a prebaked anode aluminum electrolytic cell above 400kA level. Background technique [0002] Since Hall of the United States and Heroult of France invented the cryolite-alumina melt electrolysis method to produce aluminum in 1886, the world's aluminum industry has continued to use this method so far. The key equipment for the production of aluminum by electrolysis is the electrolytic cell. From its birth to the present, the electrolytic cell has successively experienced small prebaked anode electrolytic cell, side conductive continuous self-baked anode electrolytic cell (HSS), and upper conductive continuous self-baked anode electrolytic cell ( VSS), edge processing large capacity prebaked anode electrolyzer (SWPB), middle line unloading prebaked anode electrolyzer (CWPB) and the current inte...

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Problems solved by technology

[0005] (1) The anode current density of the electrolytic cell is low: the anode current density of the existing electrolytic cell is generally 0.8A / cm 2 the following

[0006] (2) The heat dissipation capacity of the electrolytic tank shell is not good, and the cathode voltage is too high: some of the existing electrolytic tank shells and cradle frames are connected by welding, and some are connected by contact, and most of the shells do not have welding fins , even if the heat sink is welded, the optimized design is not carried out, so the heat dissipation capacity of the cathode shell is not good. For the electrolytic cell with high anode density, it is not conducive to the formation of the side furnace side and affects the life of the cell

[0007] (3) There are certain defects in the closed smoke exhaust system of the electrolytic cell, and the smoke is not uniform: the design of the gas collection structure of the electrolytic cell is unreasonable, the extraction of each part in the electrolytic cell is uneven, and the gap between the cover plates is too large, so that The gas collection efficiency of the whole system is not high

[0008] (4) The heat dissipation capacity of the end of the electrolytic cell is insufficient, and the temperature of the tank shell is too high: the end structure of the existing electrolytic cell adopts a hoarding and stiffened plate structure, and the entire end looks like a honeycomb, which is very unfavorable for heat dissipation , so that the temperature of the tank shell here is too high, resulting in deformation of the tank shell and affecting the life of the tank

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