What Are the Methods for Preparing Ammonium Metatungstate?

Ammonium Metatungstate AMT [(NH4) 6H2W12O40 • XH20], water-soluble, 300g/100ml.

Ammonium metatungstate is mainly used in the production of metal tungsten, alloy steel, fireproof fabrics, and is also used in the ceramic industry. There are many methods for preparing ammonium metatungstate (AMT), and the main principles and processes for preparing AMT are:

1. Using ammonium tungstate solution as the raw material, prepare a solution of meta tungstate by solvent extraction or ion exchange method, and then evaporate and crystallize to obtain ammonium meta tungstate;
2. AMT solution is obtained by solvent extraction method using sodium tungstate solution as raw material, and then evaporated and crystallized to obtain ammonium metatungstate
3. Heat up and thermally dissociate APT to make it lose part of ammonium and water of crystallization, convert it into ammonium metatungstate that is easily soluble in water, and then evaporate and crystallize to obtain ammonium metatungstate.
   
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