What Is Ammonium Metatungstate?

What is ammonium metatungstate? Ammonium metatungstate, AMT for short, is a white or slightly yellow crystal powder that is soluble in water and insoluble in ethanol. AMT is an important intermediate compounds of tungsten hydrometallurgical process. Its chemical formula is (NH4) 6H2W12O40·XH2O, molecular formula is H8N2O4W, and molecular weight is 283.9145.

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The CB number of ammonium metatungstate is CB41411564, the EC number is 234-364-9, the CAS number is 14311-52-5, and the commodity code is 28418040.

In AMT, the content of W is 72%, and the valence of W is +6.

AMT is available by heating ammonium paratungstate (APT) to between 220 and 280 degrees Celsius. In this process, APT loses part of its ammonium and water compounds, transforming into AMT. AMT looks like APT, while APT is insoluble in water.

Ammonium metatungstate is widely used in petroleum industry, ceramic industry, fireproof fabric and could be used as a material for producing metal tungsten, tungsten alloy, and etc.

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