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  • Ammonium Paratungstate(APT)

    What is ammonium paratungstate ?

    ammonium paratungstate Ammonium paratungstate is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(H2W12O42)?4H2O.

    APT is the most important precursor for the majority of tungsten products. Exceptions are only products of melting metallurgy and Menstrum WC produced directly from ore concentrates. All other intermediates such as tungsten trioxide, tungsten blue oxide, tungstic acid and ammonium metatungstate can be derived from APT, either by thermal decomposition or chemical conversion.

    Ammonium paratungstate is produced separating tungsten from its ore. Once the ammonium paratungstate is prepared, it is heated to its decomposition temperature, 600 °C. Left over is WO3, tungsten(VI) oxide. From there, the oxide is heated in an atmosphere of hydrogen, reducing the tungsten to elemental powder, leaving behind water vapor. From there, the Tungsten Powder Grades can be fused into any number of things, from wire to bars to other shapes.?

    Applications

    Ammonium Paratungstate is used as a laboratory reagent or as a source for high-purity tungstic acid, tungsten metal powder, or carbide. Other applications are in the fields of absorbent gels, coloring agent in the porcelain industry and the catalyst industry.

    Chemical composition of APT

    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

    Properties of APT

    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 sealde plastic bags with outer iron drums of 100/200 kgs net each. we can meet your special requirements.

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

     

    More info>>

    1.E-catalog of Tungsten Powder

    2.Ammonium Metatungstate

    3.Ready Press Tungsten Powder

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