Nanometer blue tungsten oxide, which may be applied for producing thermal insulation paper, can be prepared by self-reduction of ammonium paratungstate (APT). And so other grain size of blue tungsten oxide powder is.
For example, the process parameters of micron particle size blue tungsten oxide are as follows, the temperature is in the range of 600~800°C, the rotary furnace speed is 0.3~2r/min, and the feeding speed is 150~300kg/h. The test results of the relevant performance of the obtained blue tungsten oxide powder are as follows: oxygen index (O/W) is 2.82~2.95, FSSS is 13.6~16.3μm, residual ammonia is 0.13%~0.34%. Observing the effect of the rotary furnace speed on the preparation of blue tungsten oxide, it was found that:
The effect of the rotary furnace speed on the blue tungsten oxide is that the blue tungsten oxide particle size distribution is uniform with the increase of the rotary furnace speed. This is because the rotation speed of the rotary furnace is accelerated, the contact time between the material and the furnace tube is short, the heat is uniform, and the exhaust gas is smooth, so that the quality of blue tungsten oxide is uniform and the uniformity of particle size distribution is good.
More details, please visit:
http://www.tungsten-powder.com/Blue-Tungsten-Oxide.html
