Cryolite introduction

Cryolite is a mineral also known as Na3AlF6. The monoclinic system, columnar crystal or block.
Mohs hardness 2.5, density 2.97 to 3.00 g / cm, refractive index 1.338 -1.339, birefringence 0.001,
Positive light, dispersion value 0.024. Glass to oily. Transparent, colorless, white, brown or red.
White fine crystal, odorless, greater solubility than natural cryolite, specific gravity is 3, hardness is 2 ~ 3, easy
Absorb water and get wet. Cryolite is mainly used as a flux for aluminum electrolysis, wear-resistant filler for rubber and grinding wheels, and enamel milk.
Whitening agent, glass sunscreen and metal flux, pesticides for crops, etc. No other one has been found so far
Compounds can replace cryolite. This is because cryolite has other properties besides being able to dissolve alumina.
Some indispensable properties, such as the absence of elements that are more electrically conductive than aluminum, good stability, not under normal conditions
Decomposition, a non-volatile, non-deliquescent, melting point higher than aluminum, good electrical conductivity, energy-saving, etc. It can be said that if not
With cryolite, there may not be such a large-scale aluminum industry in the world, and the price is not so low. Applications
It is not so extensive. At present, sodium hexafluoroaluminate is mostly synthesized by fluorite for industrial use.

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