In the production technology of tungsten oxide, the sodium tungstate method (Sodium Tungstate method) is one of the commonly used methods. The following are the basic steps of the sodium tungstate method:
Raw Material Preparation
Crush and grind tungsten ore to obtain fine tungsten powder. Common tungsten ores include Wolframite and Scheelite.
Acid Leaching
React tungsten powder with acid (usually concentrated sulfuric acid), and carry out acid leaching extraction under appropriate temperature and pressure. This process allows tungsten to react with acid to generate tungstate ions, and form a sodium tungstate solution.
Filtrate And Drying
The sodium tungstate solution is treated as a filtrate, and the solid sodium tungstate is separated. The separated solid sodium tungstate can be processed by drying or sintering to remove moisture and impurities.
Pyrolysis And Conversion
The solid sodium tungstate is pyrolyzed or calcined to convert it into tungsten oxide. This step is usually performed at high temperature to remove moisture and other volatiles while converting the sodium tungstate to tungsten oxide.
Preparation Of Tungsten Oxide
Finally, the solid sodium tungstate after pyrolysis or calcination is converted into tungsten oxide. The specific heat treatment conditions can be adjusted according to the desired morphology and properties of tungsten oxide.
Sodium tungstate method is a commonly used method for preparing tungsten oxide. The method has the advantages of relatively simple operation and readily available raw materials. The obtained tungsten oxide can be used in applications in the fields of catalysts, electrochemical materials, optical materials and the like.
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