Tungsten trioxide is a dingal material that can absorb light of a specific wavelength - mainly near-infrared light (heat radiation in the sunlight), so it can be used to produce living room thermal insulating film. With its popularization and application in the field of heat insulation, the preparation of tungsten trioxide powder has attracted much attention from the scholars. And the following is a method for preparing ultrafine tungsten trioxide.
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A Preparation Method of Ultrafine Tungsten Trioxide
Step One: Prepare a 45% sodium tungstate aqueous solution, adjust the pH of the solution to 8.0 with fumaric acid, and put into a high-pressure reaction kettle for hydrothermal reaction for 12 hours. And the obtained precipitate is filtered, concentrated and crystallized to obtain seed crystal.
Step Two: Add the seed crystal to the 30% sodium tungstate solution to obtain a mixture of the sodium tungstate solution and the seed crystal, and the mass ratio of the seed crystal to the sodium tungstate in the solution is 1: 4.5.
Step Three: Place the above mixture in a stainless steel high-pressure reaction kettle, hydrothermal react for 12 hours under the condition of strong stirring at 220 °C. After that, the stirring is stopped, and the reaction product slurry is obtained after cooling to room temperature.
Step Four: The reaction product slurry is filtered and washed to obtain a filter cake and a mother liquor, and the filter cake is calcined at 350 °C to obtain ultra-fine tungsten trioxide.
