Ammonium metatungstate(AMT) is an important intermediate compounds of tungsten hydrometallurgical process, is yellowish white crystals. The solubility is the largest in the tungsten compounds which is bigger than 300g WO3/100ml H2O (in 25℃).
Acid neutralization is a process for preparing the partial route of ammonium tungstate, can use organic acid (e.g. formic acid, acetic acid, citric acid, lactic acid, etc.), can also use inorganic acid (e.g. acid, nitric acid, etc.). Organic acid is ease and easy to operate, but the price is more expensive, the cost is one major drawback. Inorganic acid, nitric acidis easy to get and cheap, prepared by nitric acid is simple technology and equipment, so it attention of people and get industrial applications.
Ammonium Metatungstate could be manufactured in different process, usually prepared from ammonium paratungstate(AMT) by Chinatungsten Online. Ammonium metatungstate is shorted for AMT. The content of WO3 of AMT is over 90.00% or 91.00%. It appears white crystalline powder, looks like ammonium paratungstate, but insoluble in water. Ammonium metatungstate is widely used in petroleum industry, ceramic industry, fireproof fabric and could be used as material for metal tungsten, tungsten alloy and ect..