Arsenic doped ammonium paratungstate may be prepared by adopting simple arsenic, nitric acid solution and ammonium paratungstate (APT) as raw materials and forming in liquid phase, the preparing steps are as below:
1. Dissolve a certain amount of simple arsenic (As) in the nitric acid solution with a certain concentration until it completely dissolves;
2. Add APT powder into the nitric acid solution of simple arsenic, and control the content of arsenic in a certain value;
3. After completely mixing by electric stirring, the raw material is dried in an oven in the temperature of 70~90°C for 8~10 hours, and finally the arsenic doped ammonium paratungstate can be obtained after grinding.
Arsenic doped ammonium paratungstate is excellent raw material for preparing nano grain size tungsten powder. The preparation of nano tungsten powder with good dispersion and uniform particle size distribution is the key to produce nano-crystalline WC-Co tungsten carbide as the particle size and distribution of tungsten based alloy is directly inherited from W powder, while the preparation of high-quality nano WC powder is the key technology for producing nano-crystalline WC-Co tungsten carbide.
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