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Home ProductsSodium Silicate Fluoride

Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight

Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight

    • Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight
    • Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight
    • Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight
  • Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight

    Product Details:

    Place of Origin: CHINA
    Brand Name: YIXIN
    Certification: ISO9001
    Model Number: YXF-005

    Payment & Shipping Terms:

    Minimum Order Quantity: 1-25ton
    Price: usd550-650/ton
    Packaging Details: 50kg/bag
    Delivery Time: 3-15days after received deposit
    Supply Ability: 1000 ton per month
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    Detailed Product Description
    Molcular Formula: Na2SiF6 Other Name: Sodium Hexafluorosilicate
    EINECS: 240-934-8 Color: White
    Appearance: Powder Or Granular Molecular Weight: 188.06

    CAS NO 16893-85-9 Sodium Fluorosilicate powder use for building industry and glass making 

     

    ►Description 

     

    Sodium fluorosilicate appears as white crystal, crystalline powder or colorless

     

    hexagonal crystals.

     

    It is odorless and tasteless.

     

    Its relative density is 2.68;

     

    it has moisture absorption capability.

     

    It can be dissolved in a solvent such as ethyl ether but insoluble in alcohol.

     

    The solubility in acid is greater than that in water.

     

    It can be decomposed in alkaline solution, generating sodium fluoride and silica.

     

    After searing (300 ℃), it is decomposed into sodium fluoride and silicon

     

    tetrafluoride. It is poisonous!
     

    In 25 degrees, the sodium fluorosilicate has its water solubility being 0.78%.

     

    Upon production, addition of an excess amount of sodium sulfate or sodium

     

    chloride can increase the concentration of sodium ions in the system, thereby

     

    increasing the solubility product of fluorine silicate and sodium ions, so that sodium

     

    fluoride can be subject to more complete precipitation. Sodium fluorosilicate is the

     

    byproduct in the production of calcium phosphate or the production of fluoride salt

     

    in aluminum factory. It generally appears as a white crystalline powder with low

     

    solubility in water (being 1% or less at room temperature), and the water solubility

     

    increases slightly with increasing temperature. The aqueous solution of sodium

     

    fluorosilicate is acidic (pH3). This is due to that its hydrolysis product contains

     

    hydrofluoric acid. Reduction of the acidicity of the solution facilitates the hydrolysis

     

    of sodium fluorosilicate. When pH is lower than 3.5-3.55, the hydrolysis reaction is

     

    stabilized. When the pH is equal to 4, the hydrolysis reaction rate is significant.

     

    When the pH value is equal to 8-8.5, the sodium fluorosilicate can be completely

     

    hydrolyzed to exhibit as silica gel and precipitated out. Therefore, when sodium

     

    fluorosilicate is added to the water glass, in addition to hardening effect of

     

    precipitation of silicon dioxide gel caused by the neutralization of the sodium

     

    hydroxide in the solution of water glass, the sodium fluorosilicate itself is also a

     

    source of silica gel.

    Reference quality standards

     

     

    105 ℃ Loss of weight upon drying% 0.17%
     

    Sodium fluorosilicate (based on dry mass) 99.50
     

    Free acid (calculated based on HCL) 0.0075
     

    Water insoluble matter 0.12%
     

    Heavy metals (Pb) content% <0.02
     

    % Fineness (through 250um sieve) 98.00
     

    Appearance white powder

    Specification 

     

       Na2Si6                Item                 Specification
    Na2SiF6 ≥99%
    Fe ≤0.02%
    Loss of Weight on drying at 105°C ≤0.40%
    Insoluble in Water ≤0.50%
    Free Acid(HCL) ≤0.15%
    Heavy Metal(Pb) ≤0.05%
     

    ►Toxicity

     

     

          This product is toxic with stimulation effect on the respiratory organ. People of

     

    mistakenly oral poisoning will get severe symptoms of damage to the

     

    gastrointestinal tract with the lethal dose being 0.4~4g. During the working of the

     

    operator, they should wear the necessary protective equipment to prevent

     

    poisoning. Production equipment should be sealed and the workshop should be

     

    well ventilated.

    ►Production method

         Calcium superphosphate byproduct method: use sulfuric acid and ground

     

    phosphate rock for production of superphosphate or fluorine-containing waste gas

     

    during extraction of phosphate with water absorbing silicon tetrafluoride to make it

     

    into fluorosilicate. When the concentration of fluorine acid solution reaches 8% to

     

    10%, stand static for clarification and remove the impurities with the clarified

     

    fluorine silicate solution being added of sodium chloride (being excess of about

     

    25%) for reaction of sodium fluorosilicate. Further go through centrifugation

     

    isolation, washing, air drying at a temperature below 300 ℃ and then pulverize to

     

    obtain the finished product of sodium fluorosilicate.
     

    H2SiF6 + 2NaCl → Na2SiF6 + 2HCl

    ►Storage characteristics

    Treasury: ventilation, low-temperature and drying; store it separately from food and

     

    acid

    Application 

    Sodium fluorosilicate can be used as:

     

    1. The insecticide in agriculture.

     

    2. Milky agent of enamel.

     

    3 the corrosion production agent of opal glass

     

    4. Wood preservatives and the raw material for the production of other kinds of

     

    fluoride as well as being applied to the smelting of beryllium and aluminum and

     

    pharmaceuticals, leather and rubber industry.

     

    5. the refractory material, it can be used as the coagulant as the water glass binding

     

    agent. Since sodium fluorosilicate has a low water solubility, it reaction with the

     

    water glass is slow and gradual. This can not only boost the construction but also

     

    has a high density and strength of the cured products.

     

    6. It is most commonly used in the inorganic material binding with the water glass.

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