Process for calcining ammonium metavanadate for preparing powdered vanadium pentoxide
A technology of vanadium pentoxide and ammonium metavanadate, which is applied in the field of powdery vanadium pentoxide calcination by ammonium metavanadate, can solve the problems of incomplete deamination, insufficient oxidizing atmosphere, high energy consumption, etc., and achieve the calcination process The effect of stable, continuous and stable operation, and short process flow
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Embodiment 1
[0031] (1) feed the ammonium metavanadate with a water content of 0.8wt% into the electric heating rotary kiln equipped with anti-caking facilities of diameter 800mm with feeder, feed rate 81kg / h; (2) heating and calcining, Cooling: Heat up the electric heating rotary furnace, ammonium metavanadate fully contacts with hot air in the furnace, the temperature of the material continues to rise, and begins to decompose at 210°C, continue to heat up to 550°C±2°C, keep it for 120 minutes, and then cool to 340°C, discharge; (3) Send the material cooled to 340°C into the cooling drum, stay for 30 minutes, and cool to 45°C to obtain the finished vanadium pentoxide 62.5kg / h; (4) Tail gas treatment and discharge : The decomposed ammonia and air go through the cyclone dust collector to collect a small amount of vanadium pentoxide contained in the exhaust gas, and then perform primary water washing and secondary pickling to reduce the ammonia content in the exhaust gas to the emission stand...
Embodiment 2
[0033] Adopt an electric heating rotary furnace with a diameter of 1250mm and equipped with anti-caking facilities. The feed ammonium metavanadate has a water content of 0.7wt%, the feed rate is 210kg / h, the calcination temperature is controlled at 525°C±2°C, and the calcination time is 150 minutes. The discharge temperature is controlled at 315°C, the material is cooled to 42°C in the cooling drum, and the product vanadium pentoxide is 162.2kg / h. The rest are the same as embodiment 1.
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