Purple Tungsten Production Principle and Characteristics

Purple tungsten oxide is a different form of tungsten oxide, tungsten, has a unique crystal structure and other tungsten oxide (blue tungsten), its performance is also very different. Blue tungsten large particles have sharp edges, gathered together by a small cube, in varying degrees of broken surface, and covered with cracks; morphology purple tungsten is significantly different from the other three, each Large particles are needle-like or rod-like grains of loose particles group. All of the tungsten oxide pellets.

Purple tungsten oxide production in general is ammonium paratungstate (APT) as raw materials in industrial rotary furnace bamboo, under certain conditions (such as access NH3) were calcined, due to the decomposition of NH3 H2, so that APT mild reducing atmosphere calcined gradual decomposition of tungsten oxide reduction generated purple. The total chemical reaction equation is as follows: 3 [5 (NH4) 2O • 12WO3 • 5H2O] = 2w18O49 + 40H2O + 35H2 + 15N2.

Characteristic purple tungsten oxide products, tungsten oxide appearance usually pale purple purple or blue-purple. Purple major components and physical properties of tungsten oxide, and its bulk density between 1.9 to 2.3, the oxygen index ≦ 2.72, specific surface between 1.3 to 3.0.

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