A Brief Introduction of Synthetic Cryolite

Item name:Synthetic Cryolite

Molecularformula:  AlF6Na3
CAS No.:13775-53-6
Molecularweight:   209.5
Execute standard: National standard/GB
Apperance: still named sodium fluoaluminate. It is a white crystalline powder or a sandy size granularity as well.
Melting point: 1000°C

Cryolite was historically used as an ore of aluminium and later in the electrolytic processing of the aluminium-rich oxide ore bauxite (itself a combination of aluminium oxide minerals such as gibbsite, boehmite and diaspore). The difficulty of separating aluminium from oxygen in the oxide ores was overcome by the use of cryolite as a flux to dissolve the oxide mineral(s). Pure cryolite itself melts at 1012 °C (1285 K), and it can dissolve the aluminium oxides sufficiently well to allow easy extraction of the aluminium by electrolysis. Considerable energy is still required for both heating the materials and the electrolysis, but it is much more energy-efficient than melting the oxides themselves. Now, as natural cryolite is too rare to be used for this purpose, synthetic sodium aluminium fluoride is produced from the common mineral fluorite.

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