Dark blue nano tungsten oxide may be applied for preparing transparent thermal insulation nanopowder, which can be applied to a lot of heat insulation fields, such as baby room, sun room, elderly room, gym, indoor swimming pool, and botanical garden, etc. Moreover, with the advancement of science and technology and the improvement of living standards, people will definitely improve their own environment to enhance the comfort of the human body and thus improve the quality of life.
Certainly, the blue tungsten oxide can be used not only for the preparation of heat insulation products, but also for the production of tungsten powder. After calcining ultrapure ammonium paratungstate to obtain blue tungsten oxide in argon, the blue tungsten oxide is reduced, and then the reduction product tungsten powder is subjected to cyclic oxidation and twice reductions. Thus, medium grain size tungsten powder with a particle size distribution of 33.8μm and a specific surface area of 0.180m2/g can be prepared, and the particle size distribution is obviously superior to that of tungsten powder obtained by once reduction.
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