Sodium fluorosilicate
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| UN number | 2674 |
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| Template:Longitem | Na2[SiF6] |
| Molar mass | 188 g/mol |
| Appearance | white granular powder |
| Odor | odorless |
| Density | 2.7 g/cm3 |
| Solubility | insoluble in alcohol |
| Template:Longitem | 1.312 |
| Template:Longitem | trigonal |
| Template:Longitem | P321 |
| Template:Longitem | a = 8.859, c = 5.038
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| Template:Longitem | Ammonium hexafluorosilicate |
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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.[3]
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.[4]
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.[5]
It also is an ingredient in some ceramic cements.
See also
References
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