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Sodium fluorosilicate is a compound with the chemical formula Na2 iF6 Unlike other sodium salts, it has a low solubility in water.


Natural occurrence

Sodium hexafluorosilicate occurs naturally as the rare mineral malladrite found within some volcanic fumaroles.


Manufacturing

Sodium fluorosilicate is made by neutralizing fluorosilicic acid with
sodium chloride Sodium chloride , commonly known as Salt#Edible salt, edible salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. It is transparent or translucent, brittle, hygroscopic, and occurs a ...
or
sodium sulfate Sodium sulfate (also known as sodium sulphate or sulfate of soda) is the inorganic compound with formula Na2SO4 as well as several related hydrates. All forms are white solids that are highly soluble in water. With an annual production of 6 mill ...
. :H2 iF6+ 2 NaCl → Na2 iF6+ 2 HCl


Possible application

Sodium fluorosilicate is used in some countries as additives for
water fluoridation Water fluoridation is the controlled addition of fluoride to Public water supply, public water supplies to reduce tooth decay. Fluoridated water maintains fluoride levels effective for cavity prevention, achieved naturally or through supplem ...
, opal glass raw material, ore refining, or other fluoride chemical (like sodium fluoride, magnesium silicofluoride, cryolite, aluminum fluoride) production. It is used for extraction of
beryllium Beryllium is a chemical element; it has Symbol (chemistry), symbol Be and atomic number 4. It is a steel-gray, hard, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with ...
from
beryl Beryl ( ) is a mineral composed of beryllium aluminium Silicate minerals#Cyclosilicates, silicate with the chemical formula Be3Al2(SiO3)6. Well-known varieties of beryl include emerald and Aquamarine (gem), aquamarine. Naturally occurring Hex ...
, by roasting the mineral with it at 700-750 °C, leaching the soluble fluoride with water, and then precipitating it as Be(OH)2 at about pH 13. It also is an ingredient in some ceramic cements.


See also

* Fluorosilicic acid * Ammonium fluorosilicate


References

{{silicon compounds Sodium compounds Hexafluorosilicates