Preparing Ultra-Fine Purple Tungsten Oxide

In recent years, ultra-fine particles as a new material, which is widely applied, ultrafine tungsten powder and tungsten carbide powder as raw material for the production of ultra-fine grain carbide has also been of great concern to the metallurgical workers. Domestic and foreign production of ultrafine tungsten powder or tungsten carbide powder were a lot of research [. Currently, the preparation of ultrafine tungsten powder has three main research directions: one to the existing blue tungsten based on the improvement process; the second is the use of the new reduction methods, such as hydrogen halide reduction; the third is the use of laser, fluidized and other new technologies.

On the use of APT for raw materials, preparation of fine particles of the active hydrogen reduction of tungsten oxide in wet hydrogen conditions - Purple tungsten process was studied. The results showed that the formation conditions of tungsten and purple reduction temperature, hydrogen humidity, heating rate, raw size, material thickness and other factors, purple tungsten particle size reduction with increasing temperature, humidity, and temperature increase rate of hydrogen gas, the raw material size and the material thickness increases. With APT (10μm) as raw materials in pH2O:pH2 = 1.7:1,2h the temperature rose to 1173K, 1173K incubated at 1.5h in the conditions obtaining direct reduction purple tungsten grain size of 2.2μm.

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