Method for recovering vanadium pentoxide in vanadium electrolyte

The invention discloses a method for recovering vanadium pentoxide in a vanadium electrolyte, and belongs to the technical field of vanadium recovery, the method comprises the following steps: adding a surfactant and an initiator into the vanadium electrolyte, and then using ultraviolet light to irradiate the solution; ammonium chloride is added into the solution subjected to ultraviolet irradiation, ultrasonic treatment is carried out, first-stage reverse extraction treatment is carried out, and precipitates are collected; then sodium hydroxide and sodium chloride are continuously added, ultrasonic treatment is carried out, two-stage reverse extraction treatment is carried out, and precipitates are collected; and respectively calcining precipitates generated in the two reverse extraction processes to respectively prepare vanadium pentoxide products with two purities. The method has the advantages of simplicity in operation, low cost, high recovery efficiency and the like, and can effectively solve the proble