Yellow tungsten oxide is one of the most important, highly pure intermediates for the production of other tungsten compounds including tungsten metal powder. Yellow tungsten oxide is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce yellow tungsten oxide. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal. Yellow tungsten oxide can be synthesized using various chemical methods, such as ‘wet’ chemical precipitation, hydrolysis of tungsten alkoxide or thermal decomposition of tungsten salts.

 

Scheelite is allowed to react with HCl to produce tungstic acid, which decomposes to yellow tungsten oxide and water at high temperatures. Another common way to synthesize yellow tungsten oxide is by calcination of ammonium paratungstate (APT) under oxidizing conditions.

 

 

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