
Nano particle size violet tungsten oxide for thermal insulation paper can be prepared by the following process: The dried ammonium paratungstate (APT) is quantitatively fed into the industrial rotary tube furnace, which has passed NH3 by a screw conveyor. And APT is calcined under certain conditions. In this process, NH3 is decomposed to generate H2, which will make APT calcined in a mild reducing atmosphere, gradually decomposed, and reduced to obtain violet tungsten oxide. According to the microstructure of the…