Something about Ammonium Paratungstate from Lanthanum Tungsten Electrode Material

Ammonium paratungstate (APT) is one of the raw materials for preparing lanthanum tungsten electrode, the other two are three tungsten oxide and lanthanum acetate, which is a white crystalline compound, and there are two shapes, flaky and acicular.

Physical properties
Molecular weight: 283.9145
Molar mass: 3132.2g / mоl
Boiling point: 600 ℃
Shape: acicular white crystals, flaky white crystals white crystals
Solubility: slightly soluble in water, insoluble in alcohol. When the temperature is less than 20 ℃, its solubility (in water) is less than 2%; when the temperature rises to 220-280 ℃, ammonium paratungstate lose some crystal water and ammonia, converting to ammonium paratungstate (AMT); when the temperature rise up to 600 ℃, it will lose all ammonia and crystalline water, converts to WO₃ (yellow).

Application
It is mainly used for the preparation of WO₃ or metal W powder, and it can also be used to prepare AMT or the other tungsten compounds, electric vacuum material (tungsten wire, tungsten rod), tungsten carbide (tungsten carbide cutting tools, drills, dies, etc.), mechanical parts (wear resistance, high temperature resistance and compression resistance) or as an additive (in petrochemical industry).



 

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