Ammonium Paratungstate Preparing Tungsten Trioxide

Ammonium paratungstate is chemical substance, and it is mainly white crystal. There are two kinds of sheet-like or needle-like, they are for the manufacture of yellow tungsten oxide or blue tungsten oxide powder. Ammonium paratungstate is used to make other tungsten compounds that are used in petrochemical industry, such as additive. The series of downstream products, such as tungsten and other electric vacuum materials; series of alloys, such as tungsten carbide, hard alloy, alloy blades, drill bits alloys, mold; wear, pressure, machinery and equipment and other high-temperature components.

Tungsten trioxide is an important η-type semiconductor oxide, it has a variety of crystal structure, and is has been applied in electrochromic, photochromic, sensing and catalysis, in which the quasi-spherical particle diameter of the tungsten trioxide is 100nm-700nm, spherical particle diameter of the tungsten trioxide is 20-200nm, both tungsten trioxide particles can be used as precursors nanometer tungsten carbide.

Vapor phase method is the most effective method for the preparation of nanostructures present; various vapor deposition techniques can form solid film, whiskers and particles. And a vapor deposition method from a high concentration of the reactants is not prepared in high purity product. But the disadvantage of the conventional vapor deposition method is very limited, since the product was collected under high vacuum or high temperature, continuous production can not be achieved. We make ammonium paratungstate as raw materials, argon as carrier, and combine innovative technology with calcination, in the vapor deposition; the reaction was collected in a low temperature region, the successful implementation produce a variety of WO₃ powders.

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