The ion exchange method uses ammonium paratungstate as the raw material to prepare ammonium metatungstate using the ion exchange method. The ammonium paratungstate is heated at 130-140 ℃ for 1-8 hours, and the resulting product is mixed into a slurry. It is boiled at 80-100 ℃ for 2-6 hours to form an ammonium metatungstate solution. After concentration and crystallization, filtration and separation, and drying, the product is obtained. The electrodialysis method uses ammonium tungstate or ammonium paratungstate as raw material to prepare ammonium metatungstate through electrodialysis: ammonium paratungstate is added to the anode chamber, when the current passes through, the ammonium ion enters the cathode chamber through the anion exchange membrane, and the concentration of ammonium metatungstate in the anode chamber increases. Finally, release ammonium metatungstate solution from the cathode chamber and prepare ammonium metatungstate according to the above method.
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