Spherical Crystal Ammonium Paratungstate

Spherical crystal ammonium paratungstate is an important raw material for preparing high density and high property tungsten alloy, tungsten oxide calcinated by spherical crystal ammonium paratungstate after hydrogen reduction has high apparent density, flow ability and even green density. It can be used to produce high property tungsten heavy alloy which has high density, tenacity and ductility. For example, W-Ni-Fe high density alloy produced by the spherical crystal tungsten powder which the fisher particle size is less than 200mm will has high density and tenacity.

The preparation of spherical crystal ammonium paratungstate is still under investigation. At present, the main technology for producing spherical tungsten powder is plasma condensation method. The equipment required for this method is complicated and the producing cost is very expensive. Producing efficiency is unsatisfied, thus it can not be used for industrial production which is only under experiment. The study on ammonium paratungstate is mainly focused on its particle size, particle size distribution, loose density and flow ability.


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