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

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.

Thermal decomposition process of ammonium paratungstate has attracted much attention of researchers as it is an important raw material for preparing tungsten oxide (by calcining APT), and tungsten oxide is an important raw material for preparing tungsten powder by hydrogen reduction, and tungsten powder is an important raw material for preparing tungsten electrode by powder metallurgy.

Tungsten heavy alloy shield is made with high tungsten content and low amounts of Ni, Fe or Ni, Cu. Some tungsten alloy shields are added Co, Mo or Cr, etc. The density of tungsten heavy alloy could be as high as 16.8-18.8g/cm3.