【Know Tungsten】What is Ammonium Metatungstate?

Ammonium metatungstate is an important intermediate compound in the tungsten wet smelting process. It appears as a white slightly yellow crystalline powder. Soluble in water, at 25℃, the solubility is greater than 300grams in 100ml water.

The main preparation methods are: acid neutralization method, thermal separation method, electrodialysis method, ion exchange method, solvent extraction method and preparation method using ammonium paratungstate as raw material. Among them, the acid neutralization method is the main process, which can use organic acids (formic acid, acetic acid, citric acid, lactic acid, etc.) or inorganic acids (tungstic acid, nitric acid, etc.). Organic acids are mild in acidity and easy to operate, but they are more expensive and affecting costs is a major drawback. Among inorganic acids, nitric acid is easy to obtain and cheap. The nitric acid neutralization method for preparing ammonium metatungstate has simple process and equipment, which has attracted people's attention and has been widely used in industrial production.

The purity of ammonium metatungstate provided by Chinatungsten Online is generally above 90.00% or 91.00%. 

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