Ammonium Metatungstate Producing Process

Below are the main producing processes of ammonium metatungstate:

1.Use ammonium tungstate solution as raw material, solvent extraction and ion exchange method is first prepared by metatungstate solution, then by evaporation and crystallization Get ammonium metatungstate.

2.Use sodium tungstate as raw material. By solvent extraction solution as raw material in AMT solution, followed by evaporation and crystallization to obtain ammonium metatungstate.

3.The heating thermal dissociation of APT, which lost its part ammonium And the water of crystallization, converted to ammonium metatungstate easily soluble in water, then evaporation and crystallization Get ammonium metatungstate.

4.Mixing APT in the water with acid and neutralize to PH3-4 condition. APT transforms into AMT solution, followed by evaporation and crystallization to obtain ammonium metatungstate.

U.S. mostly uses ammonium tungstate solution as raw material, first obtained ammonium metatungstate solution using solvent extraction or ion exchange method. Some European countries use sodium tungstate solution as raw material using solvent extraction. China mainly uses thermal decomposition method that use ammonium paratungstate (APT) as raw material.



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