Generally, hydrogen is used to reduce tungsten hexachloride to produce ultrafine tungsten powder. And this method is also known as tungsten hexachloride hydrogen reduction method to prepare ultrafine tungsten powder. It includes preparation of WCl6 and reduction of WCl6 into tungsten powder.
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The chlorination reaction of tungsten is: W+3Cl2→WCl6
In the reaction, if multiple chlorides are formed, they need to be removed by fractional distillation according to the boiling points of various chlorides.
The hydrogen reduction reaction of WCl6 is: WCl6+3H2→W+6HCl
Similarly, during the reduction of tungsten hexachloride, different reaction products may be obtained due to the different reaction rates. In addition, during the reduction process, the higher the reaction temperature, the finer the particle size of tungsten powder.
Also, there is a technology for preparing ultrafine tungsten powder from novel tungstate: Prepare hydrazine tungstate (ART for short) from tungstate-containing solution; Prepare blue tungsten oxide by ART; Prepare ultrafine tungsten powder by blue tungsten oxide.
