Blue nano tungsten oxide for infrared thermal insulation nano material may be prepared by self-reduction of ammonium paratungstate (APT). Some researchers have found a method and a device for preparing blue tungsten oxide powder from APT reduction method. In this process, no ammonia gas or mixed gas of nitrogen and hydrogen or hydrogen is needed, thereby reducing the production cost. At the same time, the emission of harmful gases such as ammonia into the atmosphere is eliminated, which means that the pollution is greatly reduced. That is to say, the preparation method and device greatly overcome the deficiencies of the prior production process.
The device comprises a reaction furnace tube, which is rotatably mounted in the heating furnace. One end of the furnace tube is set as a feed port, and the other end is set as a discharge port. The feed port is slightly higher than the discharge port. The outlet of the discharge port is connected with a discharge hopper. The lower part of the discharge hopper is connected with a sealing discharge and a cooling device and the upper part of the discharge hopper is connected with an air suction fan. An adjusting air valve is connected between the fan and the discharge hopper. The fan and the regulating air valve are connected.
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