How to Prepare Ammonium Paratungstate?

How to prepare ammonium paratungstate? At present, ion exchange method and extraction method are mainly used to produce ammonium paratungstate (APT) by domestic manufacturers.

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Preparation of Ammonium Paratungstate by Ion Exchange Method

The ion exchange method is mainly used in the production of APT from wolframite and scheelite. Sodium tungstate solution is generated by alkaline decomposition of wolframite and scheelite; Add water to dilute the sodium tungstate solution to an extent, and use ion exchange resin to absorb tungsten, and then the ammonium tungstate solution is desorbed with ammonium salt; The ammonium tungstate solution is steamed to evaporate part of the water and ammonia to obtain APT.

Preparation of Ammonium Paratungstate by Extraction

The extraction method is mainly used in the production of APT from wolframite, scheelite, tungsten mixed ore and tungsten waste. Calcine wolframite, scheelite, tungsten mixed ore and tungsten waste, and then alkaline decomposition to generate sodium tungstate solution; Filter to remove impurity; Filtered sodium tungsten solution is subjected to extraction and back extraction to obtain ammonium tungstate solution; The ammonium tungstate solution is crystallized by evaporation to obtain APT.

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