Cryolite, also known as sodium hexafluoroaluminate or sodium aluminum fluoride, is a white monoclinic mineral with chemical formula Na3AlF6. There is natural cryolite in nature, which is white columnar or massive crystal, like ice, so it is named. Industrial cryolite is mostly synthesized by artificial methods. It is a small white tasteless crystal, slightly soluble in water and easy to deliquesce. Its Mohs hardness is 2.5, and its density is 2.95-3g/cm?, The melting point is about 1000 ℃. Because it contains different impurities, it can also be gray white, light red, light brown and so on.

Conventional physical and chemical indexes of cryolite

Cryolite in molten state can dissolve a variety of salts and oxides. It can effectively reduce the melting point of alumina in the production process of electrolytic aluminum, so as to greatly reduce power consumption. It does not contain elements with better electrical properties than aluminum. It has good conductivity and stable performance. Therefore, it is an indispensable raw material in the process of electrolytic aluminum production. Cryolite is also used as a wear-resistant agent for grinding wheels and rubber products, which can effectively improve the wear resistance and service life of products. Solvents for alloys, non-ferrous metals and welding materials, deoxidizers for foundry industry, enamel emulsifiers, opacifiers and antireflective coatings for glass, fillers for ceramic industry, pesticides and other industries.

Conventional physical and chemical indexes of cryolite

Color: white, grayish white, light brown, light red

Form: solid sand, particle or powder

Crystal system: transparent to translucent monoclinic system

Main ingredients: sodium hexafluoroaluminate (Na3AlF6) ≥ 98.5%

Moisture content: ≤ 0.5%

Mohs hardness: 2.5

Density: 2.95-3g / cm?

Melting point: about 1000 ℃

Optical index: refractive index 1.338-1.339, birefringence 0.001, positive light, dispersion value 0.024

Main uses of cryolite

The cosolvent of electrolytic aluminum can greatly reduce power consumption

The additive of grinding wheel can improve the service life and wear resistance of grinding wheel

Abrasion resistant agent for rubber

Deoxidizers and fillers for metallurgical and alloy production

Emulsifier and sunscreen for glass

Pesticides, pesticide additives, etc