Quality of blue nano tungsten oxide for thermal insulation film can affect the quality of tungsten powder and tungsten carbide powder at the back end. Therefore, it is necessary to produce high-quality blue tungsten oxide powder with high specific surface area to meet the requirements of raw materials for ultrafine tungsten powder and tungsten carbide powder. Certainly, there must be good preparation processes and equipment support.
Researchers have explored a method for preparing high specific surface area of blue tungsten oxide, which mainly includes the following steps: Feed the ammonium paratungstate raw material (APT) from a raw material silo into a calciner (rotary furnace) through a screw feeder; Calcine the raw material in the calcination furnace under a negative pressure sealed environment. In this process, it is necessary to fill the calciner furnace with a protective gas --- nitrogen. The furnace temperature of the calciner is controlled by a gradient temperature control zone from high to low. The number of the furnace temperature control of the calciner is 3-6, and the temperature gradient is 800°C-500°C. The calcined material was cooled and sieved to obtain blue tungsten oxide powder with a specific surface area of 1mVg.
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