Hydrogen Reduction Tungsten Trioxide Crafts

Early preparation method is based on the classic tungsten powder and hydrogen as a reducing agent to restore the tungsten trioxide powder into metal tungsten powder, and this method is easy to control high purity tungsten powder and tungsten powder particle size, etc. In the past, it has been widely adopted in the world. Now, it is replaced by hydrogen reduction of tungsten blue.

Tungsten oxide reduction reactions are endothermic reaction, it is favorable for the restore response when temperature rises. Low tungsten oxide has a higher stability than the more expensive tungsten oxide; therefore, we use the two-stage reduction in the industry, and the second reduction temperature must be higher than the first temperature reduction. Tungsten and oxygen lines, there are tungsten trioxide WO3, tungsten oxide WO 2.9, tungsten oxide WO 2.72, tungsten oxide WO 2 and so on tungsten oxide. The total reaction of tungsten trioxide tungsten powder preparation is generally carried out step by step, that WO3 (yellow), WO 2.90 (blue), WO 2.72 (purple), WO2 (brown), W (gray).

Hydrogen reduction of tungsten trioxide, also known as yellow tungsten process, the most popular method is the continuous in the industrial production. Generally, we use the two-stage reduction system to take middle or partial fine particles and more uniform particle size tungsten powder, which is prepared by the WO3, W is prepared by the second WO2. At the time of preparation of coarse tungsten metal powder, it is used for some reduction, W is prepared by WO3.

Fine Tungsten Powder Principles
(1) A lower reduction temperature;
(2) A more stable temperature gradient;
(3) Push the boat slower speed;
(4) A small amount loaded boat or thinner material layer;
(5) Greater hydrogen flow and smaller hydrogen humidity;
(6) WO3 particles finer materials.

Coarse Tungsten Powder Principles
(1) The reduction of high temperature;
(2) A large temperature gradient;
(3) Faster push the boat speed;
(4) Large amount loaded boat or thick charge layer;
(5) The smaller and larger hydrogen flow humidity.

Hydrogen reduction of tungsten trioxide production of tungsten carbide powder has primarily for tungsten powder and tungsten material for processing of tungsten powder, tungsten powder of these two methods are different.

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