Ammonium Metatungstate
Ammonium Metatungstate (AMT) is an important compound product in the process of tungsten smelting.
It can be prepared by thermal degradation of Ammonium Paratungstate (APT) and can also be prepared by ion exchange with ammonium tungstate solution.
Ammonium tungstate water soluble white crystalline powder or slightly yellow, ammonium metatungstate dissolved in water, ammonium paratungstate slightly soluble in water, which is the difference between ammonium metatungstate and ammonium paratungstate.
Ammonium metatungstate is widely used as a raw material for the preparation of capacitors, nuclear shielding, flame retardants and corrosion inhibitors. It is also an excellent raw material for preparing superfine tungsten powder, high gravity alloy tungsten powder, phosphotungstic acid, arsenotungstic acid, silicotungstic acid.
In fact, what really makes ammonium metatungstate play an important role is in the field of petroleum processing. The field of petroleum processing, with the continuous development of the national economy, the strategic significance of oil has become increasingly prominent, and tungsten catalyst in some reactions with platinum-like catalytic activity, so that in the oil Industry has been widely used.
These years, preparation of ammonium metatungstate method has attracted much attention of many scholars,they have done a lots of research. The preparation of ammonium metatungstate also showed a hundred schools of thought contend, in addition to the traditional thermal degradation and ion exchange method, there are extraction, nanofiltration, electrodialysis, neutralization and so on.
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