Analyzing Conditions of VTO Hydrogen Reduction Process

VTO hydrogen reduction process conditions include: reduction temperature, the amount of loading the boat, push the boat speed, the flow of hydrogen, hydrogen and hydrogen-way humidity will now analyze the various factors in order to optimize the process conditions.

(1) reduction temperature. The reduction temperature from tungsten in purple key role in the restoration process, but also affect the temperature of the partial pressure of the dynamic process and hydrated tungsten volatile compounds. The reduction temperature is high, coarse, low temperature, can bypass WO2 of reaction, fine granularity.

(2) the amount loaded boat. How many boat loading capacity is mainly reflected in the material thickness, material layer on the external diffusion of water vapor resistance material thickness, high resistance to slow the proliferation of granularity is coarse, and vice versa.

(3) push speed. If you push the boat fast, VTO low temperature preheat temperature unevenness already pushed rapidly with moisture will lead to a substantial increase but can not be discharged, resulting in the formation of hydrated tungsten compound, resulting particles grow .

(4) the hydrogen flow. Increasing the hydrogen flow helps steam quickly, timely discharge, reduce or avoid the generation of hydrated tungsten, and strengthen the exchange of material. Flow, fine granularity, but not too big, too easy to bring out resulting in low recovery of materials and tube blockage.

(5) hydrogen humidity. Humidity is easy to generate hydrated tungsten compound, causing the particle size grew. When hydrogen dew point of -65 ℃ or less can be achieved dry hydrogen states.

(6) through hydrogen mode. Shun inverse hydrogen and hydrogen can be used to produce ultra-fine tungsten powder, and their advantages.

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