Ammonium paratungstate, APT for short, is an important inorganic salt product with chemical formula (NH4)10(H2W12O42) ·4H2O. There are many ways to prepare APT, including ion exchange method, neutralization method, solvent extraction method, ultrasonic method, two step ion exchange method, evaporation crystallization method, and tungstic acid method, etc. Wherein, ion exchange process is attracted much attention.

The researchers proposed a preparation method of APT (ammonium paratungstate). The method is simple and easy to operate. The yield of APT is high. The obtained APT has high purity. And the energy consumption is extremely low.

The researchers proposed a new two step ion exchange method for the preparation of high purity ammonium paratungstate. This method overcomes the shortcomings of low tungsten adsorption capacity, low concentration of crude sodium tungstate feed liquid, and large dilution of feed liquid in the ion exchange process using strong basic anion exchange resin, while maintaining certain advantages.

Thermal decomposition process of APT is the thermal decomposition process of ammonium paratungstate. The researchers have proposed a detailed and systematic decomposition mechanism of ammonium paratungstate under inert gas on the basis of summarizing previous research results.