Blue nano tungsten oxide for thermal insulation paper may be prepared by a new preparation system. And the specific steps are shown as below.
The APT was placed in a feed bin, and fed into a rotary furnace of a vacuum degree (0.5-0.8) X104 Pa at a speed of two hundred kilograms per hour through a screw feeder. A protective gas --- nitrogen gas was introduced. The temperature control is: one zone of 750°C, two zone of 750°C, three zone of 660°C, four zone of 630°C, five zone of 610°C and six zone of 610°C. After calcination in a rotary kiln, cooling, and sieving, blue tungsten oxide powder with a specific surface area of 12.35m2/g can be prepared.
The above-mentioned preparation system of high specific surface area of blue tungsten oxide includes a raw material silo, a feeder, a calciner, a tungsten oxide silo, and a vibrating screen. The raw material silo is connected to the feed port of the calciner through a feeder. The discharge port of the calciner is connected to the inlet of the tungsten oxide silo. The calciner is provided with 3-6 temperature zone control zones for calcining the feedstock at different temperatures. And the outlet of the tungsten oxide silo is connected to the vibrating screen.
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http://www.tungsten-powder.com/Blue-Tungsten-Oxide.html
