Effect of Calcination Temperature on Physical and Chemical Properties of Tungsten Trioxide

At present, in the industrial production of tungsten products, tungsten trioxide is mainly prepared by calcining ammonium paratungstate and then tungsten trioxide is used as a raw material for the production of related tungsten products. However, during the calcination of ammonium paratungstate, different calcination temperatures will have different effects on the physico-chemical properties of tungsten trioxide, which is the product of calcination of ammonium paratungstate.

After being calcined at different temperatures, the tungsten trioxide basically inherits the good morphological properties of ammonium paratungstate. This proves that the physical and chemical properties such as morphology and particle size of ammonium paratungstate have an important influence on the physical and chemical properties of subsequent tungsten products during calcination. According to the SEM images, the corresponding average particle sizes of tungsten trioxide at the calcination temperature of 500 ℃, 600 ℃ and 700 ℃ are 6.5μm, 5.9μm and 7.1μm. The average particle size of tungsten trioxide obtained at a small calcination temperature of 600 ° C is the smallest.

By analyzing the differential thermal-thermal gravimetric analysis of ammonium paratungstate, ammonium paratungstate can be completely decomposed at a temperature above 450 ℃. Therefore, when the calcination temperature is 500 ℃, ammonium paratungstate has been completely decomposed. However, since the crystallinity is not high due to the lower temperature, the fine grains tend to cause partial agglomeration, so the average grain size is larger than the calcination temperature at 600 ° C. When the temperature rises to 700 ℃, the temperature is too high will make tungsten oxide grains grow and hard agglomeration, resulting in large average particle size. Therefore, calcination of ammonium paratungstate tungsten trioxide prepared better calcination temperature of 600 ℃.

• < Prev
• Next >