Tungsten Dioxide Hydrogen Reduction Method Producing Tungsten Powder

Reduction of tungsten trioxide with hydrogen chemical reaction is: WO3 + 3H2 = W + 3H20. Tungsten has four relatively stable oxides, and the reduction reaction actually is following the sequence which is from tungsten trioxide, blue tungsten oxide, tungsten dioxide to tungsten powder. In the course of these reactions are endothermic reactions, thus raising the reaction temperature conducive to the reaction. In the hydrogen reduction process of tungsten trioxide, tungsten powder particle size usually growing up. Because during the restore process, with the reduction temperature growing high, tungsten trioxide volatility increases, its vapor deposited on the surface of the particles which has been reduced cheap tungsten oxide or tungsten metal powder. If that time tungsten trioxide reduction again, then tungsten powder particles will grow. Study found that tungsten dioxide volatile low than tungsten trioxide, so in the industries they use a two-stage reduction method to take tungsten powder. The first step will use low temperature restore tungsten trioxide. At this step reduction temperature is low so tungsten oxide particles do not grow too much. The second step use tungsten dioxide to making metallic tungsten powder, with higher temperatures. Because at this step particle growth trend compared with the first stage is small. The advantage of using a two-stage reduction of tungsten powder can give a fine, middle size of the tungsten powder, tungsten powder to improve the quality of uniformity. To obtain coarse particles of tungsten powder, it can be used a high-temperature phase reduction method to achieve.

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