Aluminum oxide is an important part of the production process of electrolytic aluminum, it is very necessary to analyze and study the content of alumina qualitatively. This paper will introduce the effect of alumina content on the main production parameters of electrolytic aluminum.

1, the effect of alumina content on the current efficiency

There are two kinds of view on this question, one is that the alumina content is high, the current efficiency is high; the other is the alumina content is low, the current efficiency is high. In fact, two kinds of statement can not say absolutely wrong, in different production conditions, and sometimes the content of alumina is too high, easy to produce precipitation and damage the electrolytic tank; sometimes the alumina content is too low, it is easy to happen anode effect. This is mainly based on the actual match of the production conditions to determine the applicability of alumina content. However, after special large-scale pre baked anode electrolytic cell, the results show that the alumina content is low.

2, the effect of alumina content on the electrolyte

The data show that the increase of alumina content will cause the electrolyte temperature to decrease, which can improve the current efficiency.

3. The effect of alumina content on the solubility of carbon dioxide in electrolyte

Practical surface, low alumina content so that the carbon dioxide reduced solubility in the electrolyte; reduced the total area of anode bubble, thereby reducing dissolved quantity of carbon dioxide reduce, thereby reducing the aluminum liquid secondary oxidation loss.

4, the relationship between alumina content and alumina precipitation

At present, most of the production are used in low temperature electrolysis process, the low temperature molecular ratio of the electrolyte in the production of aluminum oxide greatly reduced, easy to cause precipitation. Because the use of low alumina content, can avoid the generation of a large number of precipitation of electrolytic tank, is stable operation of electrolytic production.

Alumina has a more or less influence on the parameters of electrolytic production. In the production, it should pay more attention to the content of the control, according to the field conditions in real time to adjust the alumina content of the plan, do a good job to control.