Preparation method and system of high-solubility ammonium metatungstate

The invention discloses a preparation method and system of high-solubility ammonium metatungstate, and belongs to the field of metallurgy, the preparation method comprises the following steps: activating a raw material ammonium paratungstate at the temperature of 240-400 DEG C to obtain an activated product; mixing and dissolving the activated product and pure water, heating the water and productto boil to obtain a mixed solution, and adjusting the pH value of the mixed solution to obtain a dilute ammonium metatungstate solution; aging, filtering, heating and concentrating the diluted ammonium metatungstate solution obtained in the step 2 to obtain a concentrated ammonium metatungstate solution; and drying the concentrated ammonium metatungstate solution obtained in the step 3 to obtain an ammonium metatungstate product. According to the method, an ammonium paratungstate raw material is converted into water-soluble ammonium metatungstate through an activation step. The solubility of the ammonium metatungstate