Ammonium Paratungstate

Ammonium Paratungstate Picture
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Ammonium paratungstate is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(W12O41)·5H2O. It is insoluble in water, mainly used for preparation of ammonium metatungstate, tungsten oxide and tungsten powder. Heating ammonium paratungstate to 220-280°C loses part of ammonia and crystal water, which can be converted into ammonium metatungstate AMT, heating to above 600°C, loses all ammonia and crystal water, and completely transforms into tungsten trioxide.

APT Specification

Grade APT-0
WO3 Content(≥%min) 88.5
Impurity(%max)
Impurity Al As Bi Ca Cd Cr Co Cu Fe Mg Mn Mo
MAX 0.0005 0.0010 0.0001 0.0010 0.0010 0.0010 0.0010 0.0003 0.0010 0.0005 0.0005 0.0020
Impurity Na Ni K P Pb S Sb Si Sn Ti V LOI
MAX 0.0010 0.0005 0.0010 0.0007 0.0001 0.0008 0.0005 0.0010 0.0002 0.0010 0.0010 11.5

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