Thermal Decomposition Process of Ammonium Paratungstate

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.

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Studies have shown that, there are four stages of the thermal decomposition process of ammonium paratungstate. The first three stages are releasing crystalline water, releasing ammonia gas to form amorphous compounds and releasing ammonia gas and water vapor to form ammonium tungsten bronze (ATB) products, and the fourth decomposition stage is the process of ATB decomposition into WO3. But what affect the APT’s thermal decomposition process? The decomposition process of ammonium paratungstate is affected by factors such as the structure, temperature, atmosphere, and analysis method of the APT raw materials. And its thermal decomposition process directly affects the product quality.

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