The chemical formula of ammonium metatungstate
HN₆OW (also expressed as (NH4)6H2W12O40·XH2O)
Ammonium metatungstate molecular weight
2974.32000
Accurate mass of ammonium metatungstate
2975.44000
PSA (Polar Surface Area) of Ammonium Metatungstate
603.47000
W content of ammonium metatungstate
The content of W in ammonium metatungstate is 72%, and the valence of W is +6.
Thermal stability of ammonium metatungstate
Ammonium metatungstate has high thermal stability and can withstand high temperatures without decomposing. At 200-300°C, all crystal water and most of the ammonium ions are removed; at a temperature of 300-350°C, a phase transformation occurs to generate metastable tungsten oxide; when the temperature rises to 500-550°C, there is still a small amount of The ammonium radicals and bound water are not decomposed; when the heat treatment temperature is above 600°C, they are completely decomposed into tungsten trioxide (WO3).
Reducing ability of ammonium metatungstate
Ammonium metatungstate is an effective reducing agent that helps reduce tungsten oxide to tungsten metal.
Chemical stability of ammonium metatungstate
Ammonium metatungstate has a high level of chemical stability and is resistant to oxidation and other chemical reactions, allowing it to not degrade significantly during storage and transportation.
Safety of ammonium metatungstate
Ammonium metatungstate is classified as a dangerous goods, with hazard category code R22, safety instructions S26, and carries the dangerous goods mark Xn.
To sum up, ammonium metatungstate has unique physical and chemical properties, including the appearance of white crystalline powder, high solubility, complex crystal structure, high thermal stability, reducing ability, chemical stability and high purity. These properties It has been widely used in many industrial and technical fields, including the production of tungsten metal, alloy steel, fire-proof fabrics, etc., and is used in the ceramic industry. In addition, it is also the main raw material for tungsten-based catalysts in refineries, as well as used in the manufacture of various petrochemical catalysts and other tungsten compounds.
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