| abstract |
Provided are a system and method for preparing a high-purity divanadium pentoxide powder; industrial-grade divanadium pentoxide is converted to vanadium oxytrichloride using fluidizing low-temperature chlorination; by means of a fluidization gas exchanging heat with a chlorination flue gas, a chlorination gas is preheated and an appropriate amount of air is added, which causes the carbon powder to partially combust, thus providing a balanced supply of heat during the process of chlorination, improving chlorination efficiency, and ensuring the good selectivity of low-temperature chlorination; the vanadium oxytrichloride is distilled and purified, ammonium-salt precipitated, and fluidized and calcined to obtain high-purity divanadium pentoxide; the ammonia produced during calcining is condensed and returned to the ammonium salt precipitation for re-use. The system and method have the advantages of highly adaptable starting materials, low pollution, low energy consumption in production and low cost in operation, and stable product quality; the invention is suitable for use in the large-scale production of high-purity divanadium pentoxide having a purity of 4N or higher. |