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.

It is a new process to obtain tungsten trioxide by microwave heating ammonium paratungstate. The process requires a short calcination time (only 4min, while the traditional method takes about 2h), and the prepared yellow WO3 powder product is of good quality so that it is worth applying in industry.

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.

The researchers proposed a method for preparing tungsten trioxide by using wet ammonium paratungstate as raw material.