Effect of Microwave Power on The Tungsten Trioxide Particle Size

Ammonium paratungstate as the preparation of tungsten trioxide raw materials, with strong microwave absorption capacity. Ammonium paratungstate can rapidly warm up in the microwave field. The use of microwave heating calcined ammonium paratungstate preparation of tungsten trioxide, which can change the traditional production methods, shorten the production time and reduce production energy consumption. However, the tungsten trioxide prepared by calcination at different microwave powers also has different morphological and particle size physical and chemical properties.

The ammonium paratungstate was placed at a temperature of 500 ° C for a calcination time of 60 minutes. The tungsten trioxide obtained after calcination was analyzed and analyzed. The corresponding average particle sizes at the microwave powers of 600W, 700W, 800W, 900W and 1000W were 6.22 μm, 5.8 μm, 5 μm, 6.42 μm and 7.6 μm, respectively. The average particle size of tungsten trioxide first decreases and then increases with the increase of microwave power. When the microwave power is 800W, the average particle size of tungsten trioxide is the smallest. The size of the microwave power corresponds to the speed of the heating rate. With the increase of microwave power, the heating rate can be accelerated and the decomposition rate and weight loss rate of ammonium paratungstate increase continuously, which is favorable for the better dispersibility and smaller particle size of tungsten trioxide. However, when the microwave power rose to 1000W, because the heating rate is too fast, resulting in ammonium paratungstate decomposition rate also accelerated. However, collisions between ammonium paratungstate particles are also aggravated, causing hard agglomeration between the particles and increasing the particle size of tungsten trioxide. Therefore, the use of microwave heating calcined ammonium paratungstate preparation of tungsten trioxide, the microwave power should be controlled at 800W or so.

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