Nano blue tungsten oxide for transparent thermal insulation window film can be used as a raw material for hydrogen reduction to prepare tungsten powder. And some scholars have studied the relationship between the reduction time and the particle size of tungsten powder. It is found that the particle size of the powder increases with the increasing of reduction time under the conditions: the ratio of H2/WO3-x is 4.0 and the reduction temperature is 800°C and 900°C, respectively.
When the ratio of H2/WO3-x is constant, the inclination angle is decreased or the rotation speed is decreased to prolong the reduction time and slow down the frequency of material turning. While the material layer in the furnace is increased, and the water vapor generated by the reaction is not easily discharged, thereby causing the increase in particle size of tungsten powder.
In actual production, in the case of a large amount of feed, the phenomenon of insufficient reduction will appear and the oxygen content will increase if reduction time is short; If reduction time is too long, the material will accumulate too high in the furnace head, the material will flow backward and be collected by the dust system. Therefore, the reduction time is preferably controlled at the range of 1~2.5 hours.
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