Ammonium Paratungstate Tungstic Acid Method

Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH₄)₁₀(H₂W₁₂O₄₂)·4H₂O.

Method using ammonia tungstate tungstic acid dissolved, add a boil deionized water. In the stirring, heating by ammonia, Ph value is 8, in the boiling solution by adding acetic acid, and then use the dilute nitric acid. The Ph value is adjusted to 2 ~ 4, continuing heating concentrated to a relative density of 1.5 ~ 2, stop heating, cooling and filtering. The filtrate is added with ethanol. Stir, settlement after filtration, crystal at 80 ℃ drying, pulverizing to obtain the product.

Ammonium paratungstate is used as a source for high-purity tungsten oxides, tungsten metal powders, carbides, or as a laboratory reagent. Also tungsten powder including tungsten trioxide, tungsten blue oxide.




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