Cryolite belongs to the white monoclinic crystal system and is slightly soluble in water. The molten cryolite can dissolve alumina. Cryolite is often used as a flux in the electrolytic aluminum industry. With it, milky white glass can be produced, and it is also an opacifying agent for enamel.
Cryolite Uses:
Cryolite can be used as a cosolvent in aluminum electrolysis, and can be used as a wear-resistant additive in grinding products. The grinding force and cutting force of the abrasive tools added with cryolite have been significantly improved, and the service life and storage time have also been shortened. be extended. Cryolite can be used as a solvent in iron alloys, boiling steel, non-ferrous metals, as a deoxidizer in casting, as a catalyst in olefin polymerization, as an anti-reflection coating, in glass, as an emulsifier It is used in enamel, in addition, it is also an opalescent agent for glass, a flux for welding materials, a filler for ceramics, etc.
The main purpose:
Cryolite produced in nature is very rare, and most of the cryolite used in industry is artificially produced. Cryolite is used as a co-solvent, additive, deoxidizer, catalyst, emulsifier, and filler in the fields of aluminum electrolysis, grinding products, ferroalloys, non-ferrous metals, enamel, glass, and ceramics.
Industrial quality requirements:
The field with the largest amount of cryolite is still the aluminum industry. As a flux for electrolytic aluminum smelting, there are strict requirements on the sodium-aluminum molecular ratio, impurity content, and water content of cryolite.
First of all, the higher the ratio of sodium to aluminum in cryolite, the higher the current efficiency of electrolytic aluminum smelting, which can reduce the loss of fluorine and reduce the pollution to the environment. High molecular ratio cryolite is also suitable for the aluminum removal industry used in other industries.
Secondly, the content of impurities such as silicon oxide, iron oxide, and phosphorus pentoxide in cryolite must be strictly controlled, because these impurities will affect the quality of aluminum ingots and the current efficiency of aluminum smelting.
Finally, control the water content of cryolite, the lower the water content, the better, because the presence of water will increase the consumption of cryolite.
