Building method of aluminum electrolysis cell

Abstract

The invention relates to a building method of an aluminum electrolysis cell, which comprises a conventional building method and comprises the following building steps: (1) when cathode blocks of the electrolysis cell are manufactured, symmetrically chamfering the upper end part of each cathode block along the longitudinal direction, and forming a transverse groove at the top of each cathode block; (2) when the cathode blocks are built, reserving a gap of 20-40mm between every two adjacent cathode blocks, and tamping the gap by cathode tamping paste, wherein the opposite chamfers of the adjacent cathode blocks and the cathode tamping paste filled into the gap form a trapezoidal groove, and the depth of the trapezoidal groove is the same as the depth of the transverse groove at the top of each cathode block; and (3) forming one or two longitudinal grooves at the bottom of each cathode block, laying steel bars of corresponding sizes in each longitudinal groove, and tamping the gap between each cathode block and each steel bar by cathode steel bar paste. The aluminum electrolysis cell built by the method can greatly reduce the horizontal current in aluminum liquid to enable the current density of the cathode blocks and the cathode steel bars to be more uniform, thereby greatly prolonging the service life of the electrolysis cell.

Description

1. Technical field [0001] The invention relates to a method for building an aluminum electrolytic cell, in particular to a method for building an aluminum electrolytic cell with a special-shaped cathode structure. 2. Background technology [0002] At present, the extraction of aluminum in industry is mainly produced by cryolite-alumina molten salt electrolysis, and its special equipment is an electrolytic cell lined with carbonaceous materials. It is a refractory material and insulation brick. The carbon lining of the electrolytic cell is generally made of carbon bricks made of anthracite or graphite materials or a mixture of the two, which have good resistance to sodium salt and electrolyte corrosion. The carbon paste made of carbonaceous material is used for tamping between the block and the carbon block. [0003] The cathode structure of the existing aluminum electrolytic cell mostly adopts a groove at the bottom of the cathode carbon block and is equipped with a cathode...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN2846445Y discloses a micro-slit bonded cathode carbon block structure for an aluminum electrolytic cell. The cathode carbon blocks are closely arranged and bonded by extrusion. The tank can enhance the anti-leakage ability of the cathode and improve the service life of the aluminum electrolytic cell, but its electrolysis effect is not good. The horizontal current in the aluminum liquid is very large during electrolysis, and the aluminum liquid fluctuates greatly and is unstable.

Another example is that the Chinese patent CN201416037Y discloses a new type of aluminum electrolytic cell. The aluminum electrolytic cell increases the distance between the cathode carbon blocks, and the height of the fastening material is lower than that of the cathode carbon blocks, so that grooves appear between the cathode carbon blocks. , its role is to reduce the voltage drop between electrodes and improve the efficiency of electric energy, but the uneven distribution of current density and magnetic field during the use of the electrolyzer seriously affects the current efficiency

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