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Sodium fluorosilicate

1.27 g/100 mL (50 °C) 2.45 g/100 mL (100 °C) | NFPA-H = 2 | NFPA-F = 0 | NFPA-R = 0 125 mg/kg (rabbit, oral)

Fluorosilicic acid}} Sodium fluorosilicate is a compound with the chemical formula Na2[SiF6]. 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 or sodium sulfate.

:H2[SiF6] + 2 NaCl → Na2[SiF6] + 2 HCl

Possible application

Sodium fluorosilicate is used in some countries as additives for water fluoridation, 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 from beryl, 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.

References

References

  1. (2005). "Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005". RSC Publishing.
  2. Allan Zalkin, J. D. Forrester, David H. Templeton. (1964). "The Crystal Structure of Sodium Fluorosilicate". Acta Crystallographica.
  3. {{IDLH. fluoride. Fluorides (as F)
  4. "Malladrite".
  5. "PUB".
  6. Greenwood, Norman Neill. (1997). "Chemistry of the elements". Butterworth-Heinemann.
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sodium-compounds hexafluorosilicates
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