
Blue nano tungsten oxide for thermal insulation dispersion may be prepared in a rotary kiln using ammonium paratungstate (APT) as a raw material. In the process of reducing APT to prepare blue tungsten oxide, after the formation of blue tungsten oxide (WO2.9), the WO2.9 particles enter the discharge hopper from the furnace tube and slide into the discharge pipe along the inverted cone funnel. At the same time, the water vapor, N2, H2 and part of the fine powder coming…