The main production methods of tungsten oxide (Tungsten Oxide, WO3) are as follows:
Tungstate Method
Through the steps of dissolution, acidification, precipitation, washing and drying of tungstate (such as ammonium tungstate or sodium tungstate), the tungsten oxide product is finally obtained.
Ammonolysis
Metal tungsten or tungstate is reacted with ammonia gas to produce ammonium tungstate (Ammonium Metatungstate, AMT), which is then calcined and oxidized to obtain tungsten oxide.
Alkali Fusion
Metal tungsten or tungstate reacts with alkali (such as sodium hydroxide or sodium carbonate) at high temperature to form tungstate solution, and after acidification, precipitation and calcination, tungsten oxide is obtained.
Screening oxidation method: Use specific screen materials to classify and screen tungsten oxide powder to obtain the required particle size and distribution.
Gas Phase Method
Tungsten oxide is directly synthesized under gas phase conditions by high temperature pyrolysis or chemical vapor deposition.
These methods may be adjusted and optimized in combination with different process steps and conditions in actual production to meet different application requirements. Which method to choose depends on factors such as the availability of raw materials, the economics of the process, and the quality requirements of the desired product. The production process of tungsten oxide may involve some chemical substances and high-temperature operation, and relevant safety operating procedures and environmental protection requirements should be followed.
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