Cryolite plays an important role in the process of aluminum refining, which can effectively reduce the melting point of alumina. In addition, what other role can cryolite play? In addition to reducing the melting point of alumina, cryolite is mainly used as the main body of aluminum refining because of the following points. Next, I'll explain this knowledge to you. I hope it can be helpful to you.

1. Pure cryolite does not contain metal impurities whose precipitation point is higher than that of aluminum. As long as impurities are not brought into the outside world, electrolytic production can obtain more pure aluminum.

2. Cryolite can dissolve alumina very well. When the electrolysis temperature is 1000 ℃, the solubility of alumina in cryolite solution is generally about 10%.

3. At the electrolysis temperature, the density of the mixed solution of cryolite and alumina is much smaller than that of the liquid aluminum. It floats on the liquid aluminum to prevent the oxidation of aluminum and separate the aluminum from the electrolyte.

4. Have certain conductivity, so that the voltage of the electrolytic layer will not be too high.

5. The solution has a certain fluidity at the electrolysis temperature, and the anode gas can be discharged from the electrolyte, which is conducive to the circulation of the electrolyte.

6. In the melting state, cryolite basically does not absorb water and is not volatile, which will reduce the consumption of materials and ensure the stability of electrolyte.