Industrial Purple Nano-Needle Tungsten Oxide Preparation Method

Nanoscale tungsten powder (granularity≦100 nm) and ultrafine tungsten powder (100 nm≦granularity≦500 nm) are major raw materials used for preparing nanoscale tungsten carbide powder (granularity≦100 nm), ultrafine tungsten carbide powder (100 nm≦granularity≦500 nm) and ultrafine grain cemented alloy (100 nm≦granularity≦500 nm), and the nanoscale and ultrafine tungsten carbide powders and ultrafine grain cemented alloy are products of a relatively high add-on value in the present international market.

Preparation method of nano-needle purple tungsten oxide, characterized in that ammonium paratungstate 5(NH₄)₂O.12WO₃.5H₂O is used as a raw material, and the method comprises the steps of:

1.Pushing the ammonium paratungstate 5(NH₄)₂O.12WO₃.5H₂O through a feed inlet of a feeding device into a heated furnace pipe, and moving the ammonium paratungstate 5(NH₄)₂O.12WO₃.5H₂O gradually from a low temperature area to a high temperature area while the inclined furnace pipe is being rotated;

2.Heating and decomposing the ammonium paratungstate 5(NH₄)₂O.12WO₃.5H₂O into tungsten trioxide WO₃, ammonia gas NH₃ and water vapor H₂O;

3.Thermally decomposing the ammonia gas NH₃ in the furnace pipe to produce reducing hydrogen gas H₂; 

4.Moving the raw material to the high temperature area while the inclined furnace pipe is rotating, such that when the temperature of the raw material continues rising, the tungsten trioxide WO₃ is reduced gradually by the hydrogen gas H₂ to produce purple tungsten oxide WO_2.72.

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