Tungsten Disulfide Producing

There are three ways for producing tungsten disulfide which are the following:
The first method: tungsten disulfide produces by firing decomposition method. Firstly, stirring tungsten acid and ammonia water with at 57 ~ 60 ℃ to react for three hours, heat prevention  more than 16 hours of natural sedimentation. After reaction get the sodium tungstate then to react with hydrogen sulfide gas, to generate tetrathiotungstate acid. Finally after calcination, the tetrathiotungstate acid will decompose to tungsten disulfide. During the reaction, heating should at 100 ~ 200 ℃ / hr temperature gradient from room temperature to of 700 ~ 1200 ℃. Then after  heat preservation for 24 to 48 hours, then at 30 ~ 110 ℃ / hour temperature gradient descending to room temperature, and finally crushing the material. Related chemical reaction of the reaction equation is as follows:
H2WO4 + 2NH3 • H2O → (NH4) 2WO4 + 2H2O
(NH4) 2WO4 + 4H2S → (NH4) 2WS4 + 4H2O
2 (NH4) 2WS4 + 3O2 → 2WS2 + 4NH3 + 2S + 2SO2 + H2O
The second method: putting sulfur vapor through the red-hot tungsten can form tungsten disulfide
The third method: mixing tungsten with stoichiometric sulfur  at 800 ℃ for 24 hours in a nitrogen atmosphere can be formed WS2. If changing the reaction conditions, namely in 6MPa reacted with 1800 ℃, can be formed orthorhombic WS2.

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