| abstract |
the present invention provides a system and method for the preparation of a high purity vanadium pentoxide powder. an industrial-grade vanadium pentoxide is converted to vanadium oxytrichloride by a low temperature fluidizing chlorination, in which a chlorination gas is preheated through a heat exchange between a fluidizing gas and a chlorination flue gas , and an appropriate amount of air is added to allow a portion of the carbon powder to burn in order to obtain a balanced heat supply during chlorination, thereby increasing chlorination efficiency and ensuring good selectivity in chlorination at low temperature. vanadium oxytrichloride is subjected to purification by rectification, ammonium salt precipitation and fluidized calcination, thereby obtaining a high purity vanadium pentoxide, in which the ammonia gas produced during calcination is condensed and then recycled for ammonium salt precipitation. the system and method have advantages of favorable adaptability for a raw material, less pollution, low energy consumption in production and low operating cost, stable product quality and so on, and are suitable for large-scale production of a high purity vanadium pentoxide powder with a purity above 4n. |