System and method for producing high-purity divanadium pentoxide powder

摘要

Provided are a system and method for producing a high-purity divanadium pentoxide powder; using fluidizing low-temperature chlorination, industrial-grade divanadium pentoxide is converted to vanadium oxytrichloride; 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 good selectivity of low-temperature chlorination; the vanadium oxytrichloride is distilled and purified, then fluidized-vapor-phase hydrolyzed, and fluidized-calcined to produce a high-purity divanadium pentoxide product and a hydrochloric acid solution by-product. The system and method have the advantages of highly adaptable starting materials, no discharge of polluted wastewater, low energy consumption in production and low cost in operation, and stable product quality; the invention is suitable for use in the large-scale industrial production of high-purity divanadium pentoxide having a purity of 4N or higher.