Using method for aluminum electrolytic cell

Abstract

The invention relates to a using method for an aluminum electrolytic cell, which comprises the following steps of: (1) adopting the aluminum electrolytic cell in which a longitudinal trapezoidal groove and a horizontal groove are crossed on the surface of a bottom cathode block, chamfering an upper end part of the cathode block longitudinally, and forming the horizontal groove on the top of the cathode block; (2) adopting wet-process calcining to start the electrolytic cell, filling the longitudinal trapezoidal groove and the horizontal groove with graphite scraps so as to be flush with an upper surface of the cathode block before calcining, filling a layer of medium with the thickness of 0.5 to 5cm and different resistivity in different subregions on the upper surface of the cathode of the whole electrolytic cell, and starting the electrolytic cell; and (3) setting the following electrolytic conditions of the electrolytic cell: the average voltage of the electrolytic cell is 3.50 to 3.90V, the electrolytic temperature is between 900 and 970 DEG C, the electrolyte molecular ratio is 2.0 to 3.0, the electrolyte level is 14 to 30cm, the aluminum level is 16 to 28cm, the electrode distance is 3.2 to 4.2cm and the alumina concentration is 1.0 to 3.0 percent.

Description

1. Technical field [0001] The invention relates to a method for using an aluminum electrolytic cell, in particular to a method for using an aluminum electrolytic cell with a special-shaped cathode structure. 2. Background technology [0002] For more than 100 years, the aluminum industry has continuously studied new methods of aluminum smelting, and explored various ways to increase the output of single-cell aluminum, save power consumption, improve labor conditions, and reduce production costs. Among them, improving and optimizing the structure of the electrolytic cell is the best. one of the ways. At present, the aluminum industry mainly adopts the Hall-Elu electrolysis method. The direct equipment is an electrolytic cell. The electrolytic cell is mainly composed of two parts. Blocks and lining materials are built by masonry. [0003] The cathode structure of the existing aluminum electrolytic cell mostly adopts a groove at the bottom of the cathode carbon block and is e...

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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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