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CAS NUMBER: 16961-83-4
MOLECULAR FORMULA: F6H2Si
MOLECULAR WEIGHT: 144.08
DESCRIPTION:
Hydrofluosilicic acid is an inorganic compound with the chemical formula H2SiF6.
Aqueous solutions of Hydrofluosilicic acid consist of salts of the cation and hexafluorosilicate anion.
Hydrofluosilicic acids are colorless.
Hydrofluosilicic acid is produced naturally on a large scale in volcanoes.
Hydrofluosilicic acid is manufactured as a coproduct in the production of phosphate fertilizers.
The resulting hexafluorosilicic acid is almost exclusively consumed as a precursor to aluminum trifluoride and synthetic cryolite, which are used in aluminium processing.
Salts derived from Hydrofluosilicic acid are called hexafluorosilicates.
Hydrofluosilicic acid is one of the most commonly used fluoridation methods for treating drinking water.
Hydrofluosilicic acid is a challenging chemical because it has properties that pose a danger and specific storage concerns.
Hydrofluorosilicic acid is a chemical often known by other names like fluorosilicic acid and fluosilicic acid.
Hydrofluosilicic acid’s often abbreviated to HSA or FSA.
Hydrofluosilicic acid is a colorless chemical that is created when you take phosphoric rock from the ground and convert it to soluble fertilizer.
In this process, two very toxic fluoride gases hydrogen fluoride and silicon tetrafluoride are released.
The condensation from this hydrogen fluoride is collected, then scrubbed with water.
The liquid collected in these scrubbers is hydrofluorosilicic acid.
Hydrofluosilicic acid is entered into storage tanks and shipped to water departments throughout the country.
The most commonly discussed application for this chemical is water fluoridation at water treatment plants.
This process helps prevent periodontal problems and is added to drinking water.
Hydrofluosilicic acid is also commonly added to drinking water, but it can be five times as expensive.
But because Hydrofluosilicic acid can be more dangerous to store, it’s important to have a reliable and safe storage solution.
Hydrofluosilicic acid is present naturally in drinking water in large quantities and is not considered a risk.
Hydrofluosilicic acids used as fluoridating agents may contain some impurities.
Hydrofluosilicic acid can react with strong acids (such as sulfuric acid) to release fumes of toxic hydrogen fluoride.
Hydrofluosilicic acid attacks glass and materials containing silica.
Hydrofluosilicic acid reacts exothermically with chemical bases (examples: amines, amides, inorganic hydroxides).
Hydrofluosilicic acid reacts with active metals, including iron and aluminum to dissolve the metal and liberate hydrogen and/or toxic gases.
Hydrofluosilicic acid can initiate polymerization in certain alkenes.
Hydrofluosilicic acid reacts with cyanide salts and compounds to release gaseous hydrogen cyanide.
Hydrofluosilicic acid is a hazardous and corrosive byproduct of the production of hydrogen fluoride (HF) and phosphate-containing fertilizers.
Large amounts of this industrial waste are produced every year, approximately more than 2 million tons.
Hydrofluosilicic acid is obtained as a result of the reaction between HF and the inevitable impurities of silica contained in the acid grade fluorspar (CaF2) used as feedstock: in fact, SiO2 is one of the major impurities in acid grade fluorspar with a content ranging from 0.5 to 1.5% w/w.
Hydrofluosilicic Acid is also known as F6H2Si.
Hydrofluosilicic Acid is most used in aluminum production and ore refining.
Other applications include water fluoridation and various chemical synthesis reactions.
Similar to Hydrofluoric Acid, Hydrofluosilicic Acid is a strong corrosive capable of dissolving many storage materials.
For bulk Hydrofluosilicic Acid applications, storage is recommended in HDPE / XLPE vertical chemical tanks, cone bottom tanks, and double wall tanks rated to 1.9 specific gravity.
Hydrofluosilicic acid tank installation is recommended with PP / PVC fittings, Viton gaskets, and Hastelloy bolts.
This standard covers hydrofluosilicic acid for use in the treatment of potable water supplies.
Fluorosilicic acid solutions are corrosive and contact can severely irritate and burn the skin and eyes causing possible permanent eye damage.
Breathing concentrated Hydrofluosilicic acid solutions can severely irritate and burn the nose, throat, and lungs, causing nosebleeds, cough, wheezing and shortness of breath.
Many of the symptoms described are due to the hydrogen fluoride present as an impurity.
Hydrofluosilicic acid is manufactured and sold as aqueous (water) solutions.
The solutions are clear, colorless liquids that have a slightly sharp, pungent odor.
Common industrial solution strength concentrations are 23-25% and 40% in water.
Hydrofluorosilicic Acid is a colorless, fuming liquid and is the most commonly used fluoridation methods for treating drinking water.
Hydrofluosilicic acid is a complex chemical compound known for its strong scent and lack of color.
Hydrofluosilicic acid is synonymous for fluosilicic acid, and it is a compound that is used in many applications that play a role in our daily lives.
Like fluosilicic acid, it is used to develop fluoride in addition to in the development of myriad industrial materials and some cleaning products.
Hydrofluosilicic acid is also used as an electrolyte in the Betts electrolytic process for refining lead and as the active compound in some rust removal cleaning products.
Hydrofluosilicic acid can be the most dangerous chemical at a particular facility.
In the case of evaporation, it releases hydrogen fluoride that is extremely corrosive and will harm the lungs if it is breathed.
In addition, hydrofluorosilicic acid interacts with metals and produces a flammable hydrogen gas.
These dangers, along with potential corrosion or leakage, can cause imminent harm to working personnel and equipment.
Hydrofluorsilicic acid is a colorless fuming liquid with a penetrating pungent odor.
Hydrofluosilicic acid is very corrosive to metals and tissue.
Both the fumes and acute contact with the liquid can cause severe and painful burns.
Hydrofluosilicic acid is often referred to as fluorosilicic acid, silicofluoride.
Hydrofluosilicic acid’s created when you take a phosphoric rock from the ground and convert it to soluble fertilizer.
Hydrofluosilicic acid’s also used in water fluoridation, hardening of cement, ceramics, and also used as a wood preservative.
Hydrofluosilicic acid is added to the water supply to reduce the incidence of dental caries.
Hydrofluosilicic acid, sodium fluoride and sodium silicofluoride are the fluoride compounds that are commonly used for this purpose.
Hydrofluosilicic acid is produced as a co-product in the manufacture of phosphate fertilisers.
Phosphate rock, which contains fluoride and silica, is treated with sulphuric acid.
This produces two gases: silicon tetrafluoride and hydrogen fluoride.
These gases are passed through scrubbers where they react with water to form hydrofluosilicic acid.
Hydrofluosilicic acid is a strong, corrosive, pale yellow liquid with a characteristic sour odour.
Hydrofluosilicic acid is normally fed directly into water by means of various liquid feeding devices and metering pumps.
Hydrofluosilicic acid (HFS), is a water-white to a strawyellow colored solution with the chemical formula H2SiF6.
Hydrofluosilicic acid is manufactured from the mineral apatite, which is mined for its high phosphate content.
Hydrofluosilicic acid is used widely in the fertilizer industry and the fluoride recovered from the apatite is used to produce Fluorosilcic Acid.
Hydrofluosilicic acid is a chemical compound with the formula SiF4.
Hydrofluosilicic acid is notable for having a narrow liquid range: its boiling point is only 4 °C above its melting point.
Hydrofluosilicic acid is a tetrahedral molecule and is corrosive.
Hydrofluosilicic acid finds limited use in microelectronics and organic synthesis.
Hydrofluosilicic acid's also used in production of fluorosilicic acid.
Hydrofluosilicic acid is a kind of inorganic acid.
Hydrofluosilicic acid is majorly used for the fluoridation of water in United State to minimize the incidence of dental caries and dental fluorosis.
Hydrofluosilicic acid is majorly used for the manufacturing of aluminum fluoride and cryolite as well as many kinds of hexafluorosilicate salts.
Hydrofluosilicic acid can also be used for the production of silicon and silicon dioxide.
Hydrofluosilicic acid can also be used as an electrolyte in the Betts electrolytic process for refining lead.
Hydrofluosilicic acid is commonly used as a source of fluoride.
Hydrofluosilicic acid is converted to a variety of useful hexafluorosilicate salts.
Hydrofluosilicic acid is also used as an electrolyte in the Betts electrolytic process for refining lead.
Hydrofluosilicic acid is an important organic reagent for cleaving Si-O bonds of silyl ethers.
Hydrofluosilicic acid is used as wood a preservation agent and also used in surface modification of calcium carbonate.
Hydrofluosilicic acid is a colorless to light brown liquid.
Hydrofluosilicic acid is also manufactured from calcium fluoride or other fluoride-containing products.
Hydrofluorosilic acid is a strong depressant for many silicates during flotation of a number of oxidic minerals.
Hydrofluosilicic acid is used for gangue depression during flotation of tin, columbite and tantalite.
STRUCTURE:
Hydrofluosilicic acid has been crystallized as various hydrates.
In all of these salts, Hydrofluosilicic acid is hydrogen bonded to the cations.
Aqueous solutions of Hydrofluosilicic acid are often described as H2SiF6.
PRODUCTION:
Hydrofluosilicic acid is produced commercially from fluoride-containing minerals that also contain silicates.
Specifically, apatite and fluorapatite are treated with sulfuric acid to give phosphoric acid, a precursor to several water-soluble fertilizers.
This is called the wet phosphoric acid process.
As a by-product, approximately 50 kg of Hydrofluosilicic acid is produced per tonne of HF owing to reactions involving silica-containing mineral impurities.
Some of the hydrogen fluoride (HF) produced during this process in turn reacts with silicon dioxide (SiO2) impurities, which are unavoidable constituents of the mineral feedstock, to give silicon tetrafluoride.
Hydrofluosilicic acid can also be produced by treating silicon tetrafluoride with hydrofluoric acid.
USES:
Hydrofluosilicic acid is used for water fluoridation, as a metal surface treatment and cleaner and pH adjustment in industrial textile processing or laundries.
Hydrofluosilicic acid can also be used in the processing of hides, for hardening masonry and ceramics and in the manufacture of other chemicals.
The majority of the Hydrofluosilicic acid is converted to aluminium fluoride and synthetic cryolite.
These materials are central to the conversion of aluminium ore into aluminium metal.
The conversion to aluminium trifluoride is described as:
H2SiF6 + Al2O3 → 2 AlF3 + SiO2 + H2O
Hydrofluosilicic acid is also converted to a variety of useful hexafluorosilicate salts.
Hydrofluosilicic acid is used in the production of porcelains, the magnesium salt for hardened concretes and as an insecticide, and the barium salts for phosphors.
Hydrofluosilicic acid and the salts are used as wood preservation agents.
-Lead refining:
Hydrofluosilicic acid is also used as an electrolyte in the Betts electrolytic process for refining lead.
-Rust removers:
Hydrofluosilicic acid along with oxalic acid are the active ingredients used in Iron Out rust-removing cleaning products, which are essentially varieties of laundry sour.
-Niche applications:
Hydrofluosilicic acid is a specialized reagent in organic synthesis for cleaving Si–O bonds of silyl ethers.
Hydrofluosilicic acid is more reactive for this purpose than HF.
Hydrofluosilicic acid reacts faster with t-butyldimethysilyl (TBDMS) ethers than triisopropylsilyl (TIPS) ethers.
-Treating concrete:
The application of Hydrofluosilicic acid to a calcium rich surface such as concrete will give that surface some resistance to acid attack.
APPLICATION:
-Cement
-Ceramics
-Chemical Intermediate
-Electroplating
-Laundry Sour
-Ore Extraction
-Sterilizing Bottling Equipment
-Water Fluoridation
-Wood Preservative
FIRST AID:
-Inhalation:
Burning sensation.
Cough.
Laboured breathing.
Shortness of breath.
Symptoms may be delayed.
-Skin:
Redness.
Pain.
Skin burns.
-Ingestion:
Burning sensation.
Abdominal cramps.
Vomiting.
Shock or collapse
STABILITY:
- Stable under recommended storage conditions.
- Corrosive in contact with metals
- Gives off hydrogen by reaction with metals.
- Risk of violent reaction.
- Risk of explosion.
PROPERTIES:
-form: liquid
-concentration: 20-25 wt. % in H2O
-density: 1.22 g/mL at 25 °C
-InChI: 1S/F4Si.2FH/c1-5(2,3)4;;/h;2*1H
-InChI key: ZEFWRWWINDLIIV-UHFFFAOYSA-N
PHYSICAL HAZARD:
Hydrofluosilicic acid is corrosive and can corrode many metals.
Hydrofluosilicic acid is not flammable or explosive.
Exposure of Hydrofluosilicic acid to metals, strong oxidizers or high temperatures can cause decomposition.
Decomposition of Hydrofluosilicic acid will result in the liberation of hydrogen fluoride and hydrogen gas.
USES:
-Water Fluoridation
-Disinfecting Copper & Brass Vessels
-Sterilizing Bottling & Brewing
-Cement
-Ceramics
-Wood Preservative
USAGE:
-Water fluoridation
-ceramics
-disinfecting copper and brass vessels
-hardening cement
-wood preservative and impregnating compounds
-electroplating
-manufacture of aluminum fluoride
-synthetic cryolite and hydrogen fluoride
-sterilizing bottling and brewing equipment
PROPERTIES
-CAS Number: 16961-83-4
-Appearance: Liquid
-Boiling Point: 108.5 °C
-Color: Colorless
-Relative Density: 1.22 g/cm3
-Formula: F6H2Si
-Molecular Weight: 144.08
CHEMICAL PROPERTIES:
-Boiling point: 108-109°C
-density: 1.22 g/mL at 20 °C (lit.) 1.31 g/mL at 25 °C
-vapor pressure : 23hPa at 19.85℃
-refractive index: 1.3500
-Fp: 108-109°C
-storage temp.: 20°C
-solubility: H2O: 1 mg/mL, clear, colorless
-form: Liquid
-pka: 1.83[at 20 ℃]
-Specific Gravity: 1.38 (40%)
-color: Clear colorless
-Water Solubility: Miscible with water.
STORAGE:
Hydrofluosilicic acid can be the most dangerous chemical at your local water treatment plant.
Hydrofluosilicic acid can release hydrogen fluoride when it evaporates, Hydrofluosilicic acid’s corrosive, and Hydrofluosilicic acid can damage the lungs if breathed in, making it especially dangerous for plant employees if stored incorrectly.
Separated from strong bases and food and feedstuffs.
Well closed.
SYNONYM:
Hexafluorosilicic acid
16961-83-4
Dihydrogen hexafluorosilicate
Silicate(2-), hexafluoro-, dihydrogen
Hydrofluosilicic acid
Hydrofluorosilicic acid
Silicon hexafluoride dihydride
Fluorosilicic acid (H2SiF6)
hexafluorosilicon(2-); hydron
MFCD00036289
FLUOROSILIC ACID
Kieselfluorwasserstoffsaure
FLUOSILICIC ACID
53V4OQG6U1
DTXSID2029741
Dihydrogen hexafluorosilicate(2-)
NSC-16894
hexakis(fluoranyl)silicon(2-); hydron
DB-064742
FT-0626488
HYDROGEN HEXAFLUOROSILICATE (H2SIF6)
HEXAFLUOROSILICATE(2-)HYDROGEN (1:2)
FLUOSILICIC ACID (HYDROFLUOSILICIC ACID)
A811126
Q411250
J-521443
