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The chemical formula for ammonium paratungstate is (NH₄)₁₀(W₁₂O₄₁)·5H₂O.

Preparation of APT to take in many ways, the main process of preparation methods are：

1. Ammonium tungstate solution as raw material, solvent extraction or ion exchange method first obtained by partial tungstate solution, and then crystallized by evaporation ammonium paratungstate；

2. Sodium tungstate solution as raw material in a solvent extraction method take AMT solution, then crystallized by evaporation ammonium paratungstate.

3. Heat the dissociation APT, and lose some ammonium and water of crystallization, into the water-soluble ammonium paratungstate, and then evaporated to give crystals ammonium paratungstate.

Mainly used in the manufacture of tungsten metal powder like tungsten trioxide or tungsten blue oxide;the downstream products of metallic tungsten powder have tungsten material series, such as tungsten, tungsten and other electric vacuum materials; there are alloy series too, such as tungsten carbide alloy blade, alloy drill, alloy molds, etc.; and other wear, pressure, temperature and other machinery and equipment components.

Appearance: white crystal, shape are two kinds of flake or needle.
Solubility: slightly soluble in water, while 20 ℃ solubility less than 2% in water, insoluble in alcohol. The Ammonium paratungstate will lose some ammonia and water of crystallization when heated to 220-280 ℃, can be converted as ammonium metatungstate. Will lose all crystal water and ammonia when heated to above 600 ℃, into completely yellow tungsten oxide.

There are some particular existence forms of ammonium paratungstate: (1) 3(NH₄)₂O-7WO₃-6H₂O ；(2) 5(NH₄)₂O-12WO₃-5H₂O； (3) 5(NH₄)₂O-12WO₃-5H₂O ；(4) (NH₄)₂O-12WO₃-11H₂O .

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