The importance controlling alumina content in anodizing
Alumina is an important part of the anodized aluminum production process. It is necessary to analyze and study the alumina content qualitatively. This article will introduce the effect of alumina content on the main production parameters of electrolytic aluminum.
1, The effect of alumina content on current efficiency
There are two statements in the scientific community about this problem. One is that the alumina content is high and the current efficiency is high. The other is that the alumina content is low and the current efficiency is high. In fact, neither of the two statements can be said to be absolutely wrong. Under different production conditions, the alumina content is too high. It is liable to cause precipitation and damage the electrolytic cell. The alumina content is too low, and the anode effect is easy to occur. This mainly judges the applicability of alumina content according to the matching production conditions in practice. Since the special large-scale pre-baking tank for aluminum electrolysis, practice has proved that the effect of low alumina content is better.
2, The effect of alumina content on anodized
Data show that an increase in alumina content causes a decrease in electrolyte temperature, which improves current efficiency.
3, The effect of alumina content on the solubility of carbon dioxide in the anodized.
In practice, a low alumina content can reduce the solubility of carbon dioxide in the electrolyte. It can reduce the total area of anode bubbles, thereby reducing the amount of carbon dioxide dissolution, and then reducing the secondary oxidation loss of the aluminum liquid.
4, The relationship between alumina content and alumina precipitation
At present, most of the production uses low-temperature electrolysis. The solubility of low-temperature molecules in alumina is much lower than that of electrolytes in production, which is likely to cause precipitation. Because of the low alumina content, a large amount of precipitation in the electrolytic cell can be avoided, and the stable operation of electrolytic production.
Alumina has more or less influence on the parameters of electrolytic production. In production, attention should be paid to the content control, and the alumina content plan should be adjusted in real time according to the site conditions to do a good job of control.
