The Importance of Controlling Alumina Content in Electrolysis

Alumina is an important part in the production process of electrolytic aluminum. The qualitative analysis and research on the alumina content are very necessary. This article will introduce the influence of alumina content on the main production parameters of electrolytic aluminum.

A, The influence of the alumina content on current efficiency;

There are two kinds of statements on this issue the scientific community. Some think high alumina content will have high current efficiency; Others think low alumina content can bring high current efficiency. Actually, these two arguments are not absolutely wrong. Under different production conditions, sometimes if the alumina content is too high, it is easy to produce precipitation to damage to the electrolyzer; Sometimes, if the alumina content is too low, it may cause anode effect. This is mainly based on the actual production conditions to determine the suitable degree of alumina content. But it is proved that low alumina content will have better effect.

B, The influence of the alumina content on the electrolyte;

Data show that the improvement of alumina content will make the electrolyte temperature reduced, so as to improve current efficiency.

C, The influence of the alumina content on carbon dioxide solubility in the electrolyte;

The practice shows that the low alumina content will reduce carbon dioxide solubility in the electrolyte, and make the total area of the anode bubble decreased, thus reducing the dissolved amount of carbon dioxide to reduce secondary oxidation loss of molten aluminum.

D, The relationship between the alumina content and the precipitation of alumina.

At present, most producers use low temperature electrolysis method because the low alumina content can avoid a large amount of precipitation in the electrolytic cell and ensure stable operation of electrolytic production.

Alumina has more or less influence on parameters of electrolysis production, so we should pay much attention to the alumina content in production, and make real-time adjustment for the alumina content.