Method for preparing high-purity vanadium pentoxide through vacuum sublimation of metallurgical-grade vanadium pentoxide
A technology of vanadium pentoxide, metallurgical grade, applied in the field of preparation of high-purity vanadium pentoxide, vacuum sublimation of metallurgical grade vanadium pentoxide to prepare high-purity vanadium pentoxide, which can solve the problem of high cost and high-purity vanadium pentoxide Long production process and other issues, to achieve the effect of low cost, short process and high efficiency
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[0030] In order to prepare high-purity vanadium pentoxide more efficiently, the process is smoother, and the equipment is more durable. Preferably, the above method includes the following steps:
[0031] a. Metallurgical grade vanadium pentoxide is dried and crushed;
[0032] B, the metallurgical grade vanadium pentoxide processed in step a is sent into vacuum sublimation equipment, and vacuumized to 10 -3 ~10 - 6Pa, heat up to 700-1000°C for vacuum sublimation;
[0033] c. After the vacuum sublimation is completed, cool down, stop the vacuum, and take out to obtain high-purity vanadium pentoxide.
[0034] More preferably, in step a, the drying temperature is 80-150° C., and the drying time is 30-120 minutes. The pulverization adopts the airflow pulverization method, and pulverizes to -80 mesh.
[0035] Preferably, in step b, the temperature is raised to 700-1000° C., and the temperature is kept for 30-120 minutes for vacuum sublimation.
[0036] In order to prepare high...
Embodiment 1
[0043] Take 200 grams of metallurgical grade vanadium pentoxide, first dry it at 100°C for 120 minutes, put it into a 500mL platinum crucible, then put it into the middle of the vacuum sublimation apparatus furnace, close the vacuum sublimation apparatus, fill it with 0.1Pa nitrogen, and turn on the cooling water and a vacuum pump, and increase the temperature at 5°C / min. After 3 hours, the vacuum degree of the vacuum sublimator reaches 2.0×10 -5 Pa, the temperature in the middle of the furnace reaches 700°C, and the temperature is kept for 120 minutes. Turn off the heating current after the heat preservation is over, and continue to maintain the vacuum pump to work. After 4 hours, when the temperature of the vacuum sublimation instrument drops to 280°C, turn off the vacuum pump, cooling water and power supply. After 6 hours, fill in 0.1MPa nitrogen, vent, open the vacuum sublimation apparatus, take out the platinum crucible and the sublimation table, and collect the vanadium ...
Embodiment 2
[0045] Take 200 grams of metallurgical grade vanadium pentoxide, first dry it at 150°C for 60 minutes, and put it into a 500mL platinum crucible, then put it into the middle of the furnace of the vacuum sublimation apparatus, close the vacuum sublimation apparatus, fill it with 0.02Pa nitrogen, and turn on the cooling water and a vacuum pump, and increase the temperature at 5°C / min. After 4 hours, the vacuum degree of the vacuum sublimator reaches 1.0×10 -6 Pa, the temperature in the middle of the furnace reaches 1000°C, and the temperature is kept for 30 minutes. After the heat preservation is over, turn off the heating current and continue to maintain the vacuum pump. After 5 hours, when the temperature of the vacuum sublimation instrument drops to 250°C, turn off the vacuum pump, cooling water and power supply. After 6 hours, fill in 0.2MPa nitrogen, vent, open the vacuum sublimation apparatus, take out the platinum crucible and the sublimation table, and collect the vanadi...
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