Identificating Ammonium Metatungstate and Ammonium Paratungstate

Also commonly termed APT, it is the "mother salt" or fundamental intermediate for downstream manufacturing of most tungsten materials and is used in tungsten-bearing catalysts. APT is quoted on the LME where its price is used as the precursor for the tungsten market.Ammonium paratungstate is a white crystalline powder having a minimum WO3 content of 88.5%, it is traded in container loads and priced in USD/mtu WO3. Its composition is typically:

WO3  =88.5%

Mo  <0.002%

Others  <0.001%

Also commonly termed AMT. It is has higher water-solubility than APT which suits its predominant application in tungsten-bearing catalysts. It is also a white crystalline powder of up to 99.95% purity AMT.Two grades are used in the industry having WO3 contents of minimum 83% and 90%.AMT is generally priced in USD/mt of material based on its WO3 content.

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