Tungsten disulfide roasting decomposition method
Tungstic acid and ammonia water were reacted at 57-60°C for 3 hours, kept warm and naturally settled for more than 16 hours, and the ammonium tungstate produced reacted with hydrogen sulfide gas to produce ammonium tetrathiotungstate, which was roasted at high temperature and decomposed into tungsten disulfide.
H2WO4+2NH3•H2O→(NH4)2WO4+2H2O
(NH4)2WO4+4H2S→(NH4)2WS4+4H2O
2(NH4)2WS4+3O2→2WS2+4NH3+2S+2SO2+H2O
Reaction method of tungsten disulfide and liquid sulfur
WS2 can be formed by passing sulfur vapor to red hot tungsten. Mixing tungsten with stoichiometric sulfur blooms and reacting at 800°C for 24 hours in a nitrogen atmosphere can form WS2, such as reacting at 6MPa and 1800°C, can form orthorhombic WS2.
Tungsten disulfide tetrathioammonium tungstate method
Using ammonium tetrathiotungstate as raw material, heat and decompose ammonium tetrathiotungstate under the condition of isolation of air. When heating, the temperature gradient is 100~200℃/hour from room temperature to 700~1200℃. After keeping at this temperature for 24-48 hours, then lower it to room temperature with a temperature gradient of 30-110°C/hour, and then discharge and pulverize.
The preparation method of the ultra-fine scaly crystal tungsten disulfide used for lubricants has simple process equipment, does not pollute the environment, and is safe and reliable to operate, and can produce high-purity and ultra-fine tungsten disulfide with stable quality and a hexagonal crystal structure.
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