Tungsten Oxide

Tungsten(VI) oxide.pdf

Tungsten Oxide WO3 99.9%.pdf

Tungsten Oxide WO3  99.99%.pdf

Tungsten Oxide WO3  99.999%.pdf

The hydrogen reduction method of tungsten trioxide, also known as the yellow tungsten process, is widely used in industrial production as a continuous reverse hydrogen reduction approach. When preparing tungsten powder with medium or medium-fine particles and relatively uniform particle size, a two-stage reduction method is generally adopted, that is, the first stage is from WO3 to WO2, and the second stage is from WO2 to W. When preparing coarse-grained tungsten metal powder, a one-stage reduction method, namely WO3→W, is adopted. The production process is as shown in the following figure. The determination principle of the process system for medium and fine tungsten powder production is: (1) Adopt a lower reduction temperature; (2) There is a relatively stable temperature gradient along the furnace tube; (3) A relatively slow speed of pushing the boat; (4) Smaller loading capacity or thinner material layer; (5) Larger hydrogen flow rate and lower hydrogen humidity; (6) Use WO3 raw materials with finer particles. The production of coarse-grained tungsten powder adopts a one-stage direct reduction method. The principle for determining the reduction process system is: (1) Use a high reduction temperature; (2) There is a relatively large temperature gradient along the furnace tube; (3) Faster rowing speed; (4) Larger loading capacity or thicker loading layers; (5) Smaller hydrogen flow rate and larger hydrogen humidity.