Ammonium paratungstate is produced separating tungsten from its ore. Once the ammonium paratungstate is prepared, it is heated to its decomposition temperature, 600°C. Left over is WO3, tungsten oxide. From there, the oxide is heated in an atmosphere of hydroge, reducing the tungsten to elemental powder, leaving behind water vapor. From there, the tungsten powder can be fused into any number of things, from wire to bars to other shapes.

I.E. mechanical activating caustic decomposition and removing molybdenum from tungstate soluton by ion exchange method are used in this technological process for treating low grade tungsten concentrate with a low concent of WO3 and a high content of calcium and impurities to produce APT of high purity. The combination of whole technological process is reasonable and has the advantages of shorter high recovery of tungsten and high purity of product.

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Hydrogen produced in the cracking process of heated Ammonium paratungstate is used for the self-reduction of the cracked products. The impacts on blue tungsten oxide's properties by the major reduction parameters, including temperature and rotary kiln speed without ammonia or hydrogen. The application of this technology to environmental protection, energy conservation and production safety are focused.

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

Microwave decomposition of solid crystalline ammonium paratungstate (APT) and ammonium metatungstate (AMT) was investigated. It was observed that APT and AMT interact with 2.45-GHz microwave radiation. Samples of ammonium paratungstate (20-50 g) were successfully converted into WO3-x (0 ≤ x ≤ 0.2). A wide variety of morphological parameters were found. The interaction of AMT with the 2.45-GHz microwave radiation resulted in the partial loss of crystalline water and the partial dissolution of the sample in the released water.

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The strength of tungsten powder compacts mainly results from particles of irregular surface for particle shape is one of the most important factors affecting strength of tungsten powder compacts. Ammonium paratungstate has great influence on the tungsten powder particle shape. The compact strength varies greatly under the same process and raw materials with different properties while producing high compact performance tungsten powder using ammonium paratungstate one step reduction. The features of ammonium paratungstate for producing high compact performance tungsten powder are summarized by the experiments.

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