An aluminum electrolytic cell that slows down melt fluctuation and resists erosion

Abstract

The invention discloses an anti-scour aluminum electrolytic bath for retarding melt fluctuation. The anti-scour aluminum electrolytic bath comprises dry-type seepage-proof material (1), ordinary side carbon blocks (2), a cathode steel bar (8), cathode carbon blocks (9) and a bottom lining (10), wherein the side structure of the lining of the aluminum electrolytic bath is provided with a plurality of raised artificial breakwater ledges (7) according to melt flow regularity. The artificial breakwater ledges are arranged, and the effects of retarding the melt fluctuation and reducing the scour of a melt to sides are achieved, so that stable operation of the electrolytic bath with low energy consumption is realized; the artificial ledges are easy to produce and install, but the main body structure of the electrolytic bath is not influenced, so that long service life of the lining of the electrolytic bath is ensured.

Description

technical field [0001] The invention relates to an aluminum electrolytic cell, in particular to an aluminum electrolytic cell capable of slowing melt fluctuation and resisting erosion. Background technique [0002] The Hall-Héroult method is currently the only method for industrial primary aluminum production. It has the advantages of simple process and less direct pollution emissions, but it also has high energy consumption (>12500kWh / t- Al) and the short life of the tank (<2500 days). According to theoretical and practical analysis, the reason for the high energy consumption of the electrolyzer is determined by the electrochemical reaction itself in the electrolysis process on the one hand, and by the structural design of the electrolyzer and the configuration of process parameters on the other hand. Among them, the most direct parameter affecting energy consumption is the cell voltage, which is closely related to the pole distance of the electrolytic cell. However...

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Problems solved by technology

[0004] Under the increasing pressure of energy saving and consumption reduction, the current 300-600kA large-capacity and various new-type structure aluminum electrolytic cells generally adopt low voltage (3.70-3.90V), low electrolysis temperature (925-935 ℃), low superheat ( 10℃), low alumina concentration (1.5-2.5%), narrow material balance work area and narrow heat balance work area, coupled with the use of special-shaped cathode carbon blocks on some electrolytic cells, lead to dynamic self-adjustment of the tank sides The ability and protection function are greatly weakened. Once there is a small fluctuation in the electrolytic cell, the shape of the tank side is difficult to maintain a stable and ideal shape. As a result, the electrolytic cell is difficult to produce efficiently and stably, and the erosion of the side of the melt is intensified, shortening Tank life

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