Violet nano tungsten oxide is the optimum raw material for producing ultrafine tungsten nanopowder with uniform grain size now as violet tungsten oxide is elongated columnar micro crystals with ammonium paratungstate fake crystalline accumulated. Its sharp split pore structure forms good permeability and can realize the fast recovery of dry hydrogen. At the same time, it can avoid generating β-W and α-W in WO2 period.
Violet Nano Tungsten Oxide to Produce Nano Tungsten Powder
Step one: The dry ammonium paratungstate (APT) is first quantitatively delivered by a spiral conveyor into an industrial rotary tube furnace and calcined under certain conditions.
As the NH3 generated by thermal decomposition of APT at high temperatures will be re-decomposed into H2 so that the generated WO3 will be reduced to WO2.72, which is self-reduction of violet tungsten oxide.
Step two: The violet tungsten oxide obtained in the previous step is fed into a 15 tube reduction furnace at proper intervals. And then the violet tungsten oxide obtained in three-furnace chamber, is preheated in the low-temperature zone and sent to the high-temperature zone to carry out high-flow dry hydrogen-controlled gas phase migration. Inverse reduction of hydrogen to prepare nano tungsten powder with different grain size.
Step three: Cooling down for 30 min, then baking, sieving and detecting.
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