The working principle of cryolite as a flux

The working principle of cryolite as a flux

Cryolite is a co-solvent in the aluminum industry. Alumina will dissolve in cryolite, just like a solution. Moreover, dissolution is much easier than melting, and the natural melting point will be lowered. And why can it be fluxed? Next, the cryolite manufacturer-Jin Shengwei Fluorochemicals, will explain to you, I hope it can be helpful to you.

Information: In addition to being able to dissolve alumina, it also has other indispensable properties. For example, it does not contain elements that are more positive than aluminum, has good stability, decomposes under normal conditions, is not volatile, and does not deliquesce, and has a higher melting point than aluminum. It is conductive Good performance, saving power and so on. It can be said that if there is no cryolite, there may not be such a large-scale aluminum industry in the world, the price is not so low, and the application is not so widespread.

   Cryolite is used as a solvent to dissolve alumina and then electrolyze. It plays a key role here. It solves the difficulties of alumina with high melting point (up to 2 050 ℃), non-conductivity, and inability to electrolyze alone. After the alumina is dissolved in it, it can be electrolyzed at a temperature (940 ℃ ~ 980 ℃). It also has other magical functions. It is lighter than aluminum in the molten state. The electrolytic aluminum sinks to the bottom of the tank, and cryolite floats on it, which plays a role in preventing aluminum from being oxidized by air.