Tungstate method (Ammonium Paratungstate, APT method) is a commonly used tungsten oxide production technology. The following are the basic steps of the tungstate method:
Raw Material Preparation
Ammonium tungstate (Ammonium tungstate) was used as the starting material. Ammonium tungstate is an inorganic salt containing tungsten, and its common form is white crystalline powder.
Solution Preparation
Dissolve ammonium tungstate in an appropriate amount of water to form ammonium tungstate solution. The concentration and proportion of the solution can be adjusted to control the properties of the product.
Precipitation
The ammonium tungstate solution is treated by heating and evaporation to promote the decomposition of ammonium tungstate and the formation of tungstate precipitates. This step is usually performed under specific temperature and pressure conditions to control the morphology and purity of the precipitate.
Filtrate And Drying
The precipitate is separated from the solution, usually by means of a filtrate. Subsequently, the precipitate can be processed by methods such as drying or sintering to remove residual moisture and impurities.
Preparation Of Tungsten Oxide
Finally, tungsten oxide can be obtained by heat-treating the precipitated tungstate. The heat treatment process is usually carried out at high temperature to cause the decomposition and conversion of tungstate to tungsten oxide. The specific heat treatment conditions can be adjusted according to the desired morphology and properties of tungsten oxide.
The tungstate method is a commonly used method for preparing tungsten oxide, which can be used to prepare tungsten oxide materials with different shapes and particle sizes. Its advantages include relatively simple operation and readily available raw materials. Tungsten oxide produced by this method can be used in various fields, such as catalysts, electrochemical materials, optical materials, etc.
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