Method for improving electrolyte viscosity of aluminum reduction cell

An aluminum electrolytic cell and electrolyte technology, which is applied in the field of electrolytic aluminum, can solve problems such as affecting current efficiency and stable production, unbalanced control of alumina concentration, and difficulty in discharging anode gas, reducing the phenomenon of shell head and bag, improving production stability, The effect of avoiding the phenomenon of alumina concentration imbalance

Inactive Publication Date: 2013-10-16
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

The shell head bag will affect the normal shelling and feeding of the electrolytic cell, and the feeding will not be smooth again, which will easily cause the anode effect and make the concentration of alumina in the electrolyte unbalanced, seriously affecting the current efficiency and stable production
In addition, the viscosity of the electrolyte is too high, resulting in poor solubility of alumina. At the same time, the carbon slag in the tank is not easy to separate, and the anode gas is not easy to discharge, resulting in excessive electrolyte pressure drop, average voltage rise and other unfavorable factors. The stability of the electrolytic cell is poor, which seriously affects the current. Efficiency and smooth production

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  • Method for improving electrolyte viscosity of aluminum reduction cell

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Embodiment Construction

[0018] The implementation of the present invention will be described in detail below in conjunction with the examples.

[0019] Take the 180KA aluminum electrolytic cell as an example:

[0020] 1. Adjustment of process technical conditions:

[0021] A representative tank A is selected as the implementation tank. In this tank, the electrolyte is sticky, the electrolyte is splashed at the aluminum outlet and the ignition hole of the blanking, and the sudden effect and the shell head bag increase. After analysis, the molecular ratio of the tank is high (2.6), the concentration of alumina is high (4.0%), and the degree of superheat is low (5.8°C). According to the above analysis, make the following adjustments to the tank parameters:

[0022] 1) Increase the working voltage by 5mv to 4.050V; and strengthen the insulation of the electrolytic cell to reduce heat loss;

[0023] 2) Increase the amount of aluminum fluoride added and reduce the molecular ratio to 2.45;

[0024] 3) A...

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Abstract

The invention discloses a method for improving electrolyte viscosity of an aluminum reduction cell, which comprises the following steps of: (1) raising working voltage by 5mv to 10mv; (2) reducing the molecular ratio of NaF / AlF3 to 0.1-0.2; (3) adjusting blanking NB interval and reducing alumina density to 1.5%-3.0%. Meanwhile, the aluminum reduction cell is insulated by the means of electrical heating to lessen heat loss. The method can be used for overcoming adverse factors caused by the hyperviscosity of electrolyte for aluminium electrolysis, lowering the labour intensity of workers, improving the production stability of the aluminum reduction cell, and guaranteeing the efficient and steady production of the aluminum reduction cell.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum, in particular to a method for improving the viscosity of the electrolyte of an aluminum electrolytic cell. Background technique [0002] In the production of aluminum electrolytic cells, due to the certain viscosity of the electrolyte, the viscosity of the electrolyte is inversely proportional to the degree of superheat of the electrolyte, that is, the smaller the degree of superheat, the greater the viscosity. The concentration of alumina is directly proportional to the viscosity of the electrolyte, that is, the greater the concentration of alumina, the greater the viscosity. During the frequent shelling and blanking process, layers of electrolyte and alumina mixture will adhere to the shelling hammer, and finally form a shell head package. The shell head bag will affect the normal shelling and feeding of the electrolytic cell, and the feeding will not be smooth again, which will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/18C25C3/20
Inventor 周虹王广稳田元欢郭刚杨得生汪建民贺铭兰李韦华王进才王昌红席霁琼
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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