APT Mild Hydrogen Reduction Method Producing Blue Tungsten Oxide

Ammonium paratungstate mild hydrogen reduction method producing blue tungsten oxide is usually processed in multi tube furnace, after add in APT, decompose it in tube and inject hydrogen, maintain the reducing atmosphere in tube, emission the decomposed gas and waste gas out of tube and burn it. Phase composition of blue tungsten oxide can be adjusted by controlling hydrogen flow, reducing temperature and pushing rate of boat.

APT mild hydrogen reduction method producing blue tungsten oxide uses 11 tube furnace, temperature area is 5, reducing temperature is 300~450℃, the ventilation property is the best with proper NH3 content. NH3 content has big influence on blue tungsten oxide property, it is controlled between 0.6~0.9% during producing process. Blue tungsten oxide liquid suspension pH value is usually 3~4, it is hexagonal structure, has fast ion exchange ability in aqueous solution.