Tungsten trioxide, doped with alkali metals, is increasingly applied for preparing hotel thermal insulating glass coating. Therefore, the preparation of the raw material tungsten trioxide powder is achieving more attention. In this regard, the experts introduced a method for preparing tungsten trioxide. The specific steps are as follows:
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Step One: Prepare a 45% sodium tungstate aqueous solution, adjust the pH of the solution to 6.5 with maleic acid, and hydrothermally react in a high-pressure reaction kettle for 12 hours. The obtained precipitate is filtered, concentrated and crystallized to obtain seed crystal.
Step Two: Add the seed crystal to a 42% 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. Under the condition of strong stirring at 220 °C, the hydrothermal reaction was carried out for 12 hours. After that, stop stirring, and the slurry was obtained after cooling to room temperature.
Step Four: The prepared slurry is filtered and washed to obtain a filter cake and a mother liquor, and the filter cake is baked at 350 °C to obtain ultra-fine tungsten trioxide.
