Tungsten Oxide Hydrogen Reduction Equipment -- Four Tube Reduction Furnace
Tungsten oxide hydrogen reduction process is generally carried out in a multiple tube furnace, in the tubular reduction furnace, the most used in China are the thirteen tube reduction furnace and the four tube reduction furnace.
Four tube reduction furnace is commonly used as a tungsten oxide hydrogen reduction unit, the furnace shell is welded by ordinary steel plates, and the four tubes are placed at the same level on the same hearth. Compared with the old four tube muffle furnace up and down the structure, the temperature uniformity is much better. The automation level of the four tube reduction furnace is higher than the thirteen tube reduction furnace, and it is easier to realize mechanization and electrification, in addition, the capacity of the four tube reduction furnace is large, but the unit energy consumption is lower than the thirteen tube reduction furnace.
The furnace temperature of the four tube reduction furnace is between 600 °C and 1000 °C centigrade, and natural gas is used to heat the natural gas supply, generally speaking, the loading capacity of a four tube furnace is slightly larger than a thirteen tube reduction furnace, preparation of ultrafine tungsten powder temperature is set to the third gear. But theoretically, four tubes reduction furnace to make ordinary tungsten powder is not bad, the preparation of super tungsten powder is not as handy as the thirteen tube reduction furnace.
In industry, the production of tungsten powder is usually reduced by hydrogen reduction furnace. However, there are also documented that an enterprise adopts the two stage method to obtain fine particles of tungsten powder. When the two stage reduction is adopted, the first stage is carried out at a lower temperature (500 °C - 700 °C), the main function is to produce two suitable tungsten oxide for grain size, using four tube reduction furnace. The second stage was carried out at 600 °C and 1100 °C, using thirteen tube reduction furnace. But the author believes that the best scheme for preparing fine particles of tungsten powder should be to avoid the formation of WO2. In practical work, it is feasible to make a single reduction of hydrogen with blue tungsten or purple tungsten.
Whether it is a four tube reduction furnace or a thirteen tube reduction furnace, the capacity to produce ultrafine tungsten powders from them is not very high, in order to make the tungsten oxide powder uniformly heated, it is inevitable to reduce the amount of tungsten powder loaded into the container, only a thin layer, so the production capacity is obviously not to be seen. But fortunately the four tube reduction furnace is high, some scholars scholars suggest that one or two upper boats should be placed on the bottom of the reduction boat, and the hydrogen can flow in the boat, which can greatly improve the production capacity of ultrafine tungsten powder.
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