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  • Tungsten Trioxide

    tungsten trioxide

    History

    Tungsten has a rich history dating back to its discovery during the 18th century. Peter Woulfe was the first to recognize a new element in the naturally occurring mineral, wolframite. Tungsten was originally known as wolfram, explaining the choice of "W" for its elemental symbol. Swedish chemist Carl Wilhelm Scheele contributed to its discovery as well with his studies on the mineral scheelite.
    In 1841, a chemist named Robert Oxland gave the first procedures for preparing tungsten trioxide and sodium tungstate. He was granted patents for his work soon after, and is considered to be the founder of systematic tungsten chemistry.

    Tungsten Trioxide Synonyms

    Tungsten oxide, tungsten(IV) oxide (WO2), tungsten(VI) oxide (WO3), tungsten trioxide, tungsten(VI) trioxide, tungstic anhydride, CAS#1314-35-8 (WO3), ditungsten pentaoxide, tetratungsten undecaoxide, tungsten oxide, tungsten oxide (W2O5), scheelite, wolframite, ferberitetungsten oxide (W4O11),

    Preparation

    Tungsten(VI) oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

    2WO3 + 3C + heat → 2W + 3CO2
    WO3 + 3H2 + heat → W + 3H2O

    Tungsten(VI) oxide occurs naturally in form of hydrates, which include minerals: tungstite WO3?H2O, meymacite WO3?2H2O and hydrotungstite (of same composition as meymacite, however sometimes written as H2WO4). These minerals are rare to very rare secondary tungsten minerals.
    Tungsten trioxide can be prepared in several different ways. CaWO4, or scheelite, is allowed to react with HCl to produce tungstic acid, which decomposes to WO3 and water at high temperatures.

    CaWO4 + 2HCl → CaCl2 + H2WO4
    H2WO4 + heat → H2O + WO3

    Another common way to synthesize WO3 is by calcination of ammonium paratungstate (APT) under oxidizing conditions:

    (NH4)10[H2W12O42]?4H2O → 12 WO3 + 10NH3 + 11H2O

    Structure

    The crystal structure of tungsten trioxide is temperature dependent. It is tetragonal at temperatures above 740 °C, orthorhombic from 330 to 740 °C, monoclinic from 17 to 330 °C, and triclinic from -50 to 17 °C. The most common structure of WO3 is monoclinic with space group P21/n.

    Uses

    tungsten trioxideTungsten trioxide is used for many purposes in everyday life. It is frequently used in industry to manufacture tungstates for x-ray screen phosphors, for fireproofing fabrics and in gas sensors. Due to its rich yellow color, WO3 is also used as a pigment in ceramics and paints.
    In recent years, tungsten trioxide has been employed in the production of electrochromic windows, or smart windows. These windows are electrically switchable glass that change light transmission properties with an applied voltage. This allows the user to tint their windows, changing the amount of heat or light passing through. Another new use for tungsten is in Dense Inert Metal Explosives, the first notable use of these devices was during the 2008–2009 Israel–Gaza conflict.
    2010- AIST reports a quantum yield of 19 % in photocatalytic water splitting with a cesium enhanced tungsten oxide photocatalys.

    Grade

    WO3 (%,min.)

    Impurities (%,max. )

    As

    Fe

    Ca

    (K+Na)

    Co

    Mg

    Special

    88.8

    0.001

    0.001

    0.001

    0.002

    0.0005

    0.0005

    1st

    88.5

    0.001

    0.001

    0.001

    0.002

    0.001

    0.0005

    Mn

    Ni

    Si

    Ti

    Mo

    Cu

    V

    P

    0.0005

    0.0005

    0.002

    0.0005

    0.002

    0.0005

    0.0005

    0.0007

    --

    0.0007

    0.002

    0.001

    0.005

    0.0007

    0.001

    0.0007

    S

    Cr

    Al

    Sb

    Pb

    Sn

    Bi

    Cd

    0.0007

    0.0003

    0.0003

    0.0002

    0.0001

    0.0001

    0.0001

    0.0001

    0.0007

    --

    0.0005

    0.0005

    0.0001

    0.0001

    0.0001

    0.0001

     

    Grade

    Igniting loss(%)

    Apparent density(g/cm3)

    Screen size  (mesh)

    Special

    11.2

    2~2.4

    -80,100%

    1st

    11.5

    2~2.4

     -

    Packing:In iron drums lined with two plastic bags of 100 or 200 kgs net each.
    Note:Any particular requirements to the products can be discussed.

    If you have any interest in tungsten trioxide, please feel free to contact us by email: sales@chinatungsten.com or by telephone: +86 592 5129696.

    More info>>

    1.Tungsten Powder

    2.E-catalog of Tungsten Powder

    3.Tungsten Trioxide

    4.MSDS of Tungsten Powder

     

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