There are many manufacturing methods for ammonium metatungstate (AMT), the main preparation processes are:
Ammonium tungstate solution raw material
Ammonium metatungstate solution is prepared by ion exchange method, and then ammonium metatungstate is obtained by evaporation and crystallization.
Sodium tungstate solution as raw material
The AMT solution was prepared by solvent extraction, and then ammonium metatungstate was obtained through evaporation and crystallization.
Thermal Dissociation Ammonium Paratungstate
Heating thermally dissociates ammonium paratungstate (APT) to lose part of ammonium and crystal water, and converts it into ammonium metatungstate which is easily soluble in water, and then obtains ammonium metatungstate through evaporation and crystallization.
Acid neutralization ammonium paratungstate
Ammonium paratungstate (APT) is stirred in water and neutralized with acid to pH 3-4 to convert APT into AMT solution, and then evaporate and crystallize to obtain ammonium metatungstate.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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