How to Prepare High Purity Ammonium Paratungstate?

How to prepare high purity ammonium paratungstate? The researchers proposed an economical method for preparing high purity ammonium paratungstate with high yield and simple process.

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A Preparation Method of High Purity Ammonium Paratungstate

Pour 215 L of deionized water in a heated 200 L stirred reactor. Add 200 kg of APT·10H2O with stirring. Then, the suspension was treated at 90 °C for 2 h with stirring. When the molar ratio of NH3: W is 0.77: 1, the NH3 concentration in the liquid phase is 2.1 g/L. The pH at room temperature is 6.8. The mass ratio of solid to aqueous solution is 0.80: 1. After the treatment, the suspension was filtered, the product was washed with 10 L of deionized water, and finally dried at 100 °C to obtain 184 kg (corresponding to a yield of 95.3%) of high purity ammonium paratungstate.

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