Blue nano tungsten oxide may be applied for the preparation of transparent thermal insulation material. And the thermal insulation material is widely applied in building, car, and even airplane for heat insulation. Therefore, the production method of nanometer blue tungsten oxide for transparent heat insulating materials is developing with the progress of scientific research. At present, the blue tungsten oxide is mainly prepared by using ammonium paratungstate (APT) as raw material at home and abroad. The main process is as follows:
NH3 or a mixed gas of nitrogen and hydrogen decomposed by liquid ammonia or hydrogen is directly inletting into the discharge port. Under the suction of the fan at the feed port, NH3 or the mixed gas of nitrogen and hydrogen or hydrogen enters through the discharge port and exits the feed port after passing through the furnace tube. When the discharge port is inlet with ammonia gas, the ammonia gas is subjected to the action of tungsten oxide in the furnace tube and is decomposed into nitrogen gas and hydrogen gas. Then, the hydrogen gas will reduce the tungsten trioxide to blue tungsten oxide, and the blue tungsten oxide powder can be obtained at the discharge port.
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