Preparation Method of Industrial Purple Nano-needle Tungsten Oxide

Provided is a preparation method of industrial purple nano-needle tungsten oxide, wherein ammonium paratungstate 5(NH4)2O⋅12WO3⋅5H2O, tungstic acid mWO3⋅nH2O (m≥1, n≥1), or oxides of tungsten WOx (2≤x≤3) is used as raw material, and a declined rolling furnace pipe is employed. At the inlet of the furnace pipe, the raw material is conveyed from the inlet into the heated furnace pipe by a feeder unit, and is moved gradually from a low temperature area to a high temperature area under the rotation of the declined furnace pipe; the raw material is reduced by H2 at the high temperature area, to obtain purple nano-needle tungsten oxide WO2.72 , the obtained tungsten oxide WO2.72 is moved gradually toward the outlet under the rotation of the declined furnace pipe, and is discharged from the outlet, as well cooled to about room temperature.

The method for preparing a nano-needle purple tungsten oxide, wherein is paratungstate 5 (NH 4) 2 O · 12WO 3 · 5H 2 O as raw materials, the following steps:

A, With a feed device from the feed end of the tungsten Chung-ammonium 5 (NH 4 of 5) 2 O Visual & 12WO 3 · 5H 2 O from the feed inlet pushed into to the heated furnace tube, in the role of rotation of the tilt furnace tube, gradually from low temperature zone to move to the high temperature zone;

B, Ammonium paratungstate (NH 4) 2 O · 12WO 3 · 5H 2 O was heated to decomposition of the tungsten trioxide WO 3, ammonia NH 3, and water vapor H 2 O;

C, In the furnace tube so that ammonia NH 3 is thermally decomposed to generate a reducing gas of hydrogen H 2;

D, The material in the rotation of the furnace tube inclined to continue to move to the high-temperature region, when the when material temperature continues, the tungsten trioxide WO 3 is hydrogen H 2 gradual reduction generated purple oxide of tungsten WO 2.72.




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