Nano violet tungsten oxide applying in thermal insulating glass is prepared by a light reduction method in an industrial rotary furnace (the raw material is APT). In order to realize the continuous industrial production of violet tungsten oxide with fine and uniform particle, and stable quality, scholars, after long-term production test and research, have found that the production of nano grain size violet tungsten oxide by rotary kiln should meet the following conditions:
1. The furnace tube has a certain temperature gradient. In other words, the furnace can be zoned to control the temperature, and the temperature on each section of the furnace tube is uniform and stable to avoid the existence of heating dead zone and affect product quality.
2. The inner wall of the furnace tube should be smooth to prevent the reactants from sticking to the inner wall of the furnace tube, resulting in furnace accretion.
3. Facilitate mechanization and automation.
4. With good exhaust performance, the water vapor generated by the reaction can be discharged in time.
5. The rotary kiln should be sealed; the gas continuously flows through the furnace tube, which is in full contact with the material; meanwhile the outside of the furnace tube is uniformly heated.
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