SYSTEM AND METHOD FOR PREPARING HIGH-PURITY VANADIUM PENTOXIDE POWDER

摘要

The present invention provides a system and method for preparing high-purityvanadiumpentoxide powder. Industrial grade vanadium pentoxide is converted to vanadiumoxytrichloride bylow temperature fluidizing chlorination, wherein chlorinating gas is preheatedvia heat exchangebetween fluidizing gas and chlorination flue gas, and an appropriate amount ofair is added to enablea part of carbon powder to combust so as to achieve a balanced heat supplyduring the chlorination,thereby increasing the efficiency of chlorination and ensuring goodselectivity in low temperaturechlorination. The vanadium oxytrichloride is subjected to purification byrectification, ammoniumsalt precipitation and fluidized calcination, thereby obtaining high-purityvanadium pentoxide,wherein the ammonia gas produced during calcination is condensed and thenrecycled forammonium salt precipitation. The system and method have advantages offavorable adaptability to araw material, less pollution, low energy consumption in production and lowoperation cost, stableproduct quality and so on, and are suitable for large-scale production of high-purity vanadiumpentoxide powder with a purity of above 4N.