Ammonium paratungstate (APT), a white crystalline salt, is well-known as the most important raw material for producing all other tungsten products, so the production methods of APT attract much attention.
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Production Methods of Ammonium Paratungstate
1.From tungsten ores. Tungsten ores, which are typically oxides, are digested in base to give solutions of tungstate together with many contaminating species. This crude extract is acidified and treated with sulfide to separate molybdenum trisulfide. Upon further acidification APT eventually crystallizes.
2.Laboratory methods. If a calcined WO3 is used, refluxing the ammonia solution is advisable to accelerate its dissolution.
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