System and method for preparing high-activity specific-valence-state electrolyte of all-vanadium flow battery

摘要

Provided are a system and a method for preparing a high-activity specific-valence-state electrolyte of an all-vanadium flow battery. A vanadium-containing material is reduced into a low-valence vanadium oxide with the averaged valence state being any value in the range of 3.0-4.5 through precise fluidization control, then water and sulfuric acid are added for dissolution, and a microwave field is further adopted for activation, so as to obtain a specific-valence-state vanadium electrolyte. Heat is efficiently utilized through heat exchange between the vanadium-containing material and a reduction tail gas and heat exchange between a reduction product and fluidized nitrogen; an inner member and discharging ports at different heights are arranged in a fluidized reduction bed to achieve precise control over the valence state of the reduction product; and vanadium ions are activated by using the special chemical effect of the microwave field, such that the electrolyte activity is greatly improved. The method has advantages such as a short process, high efficiency and cleanliness, and stable product quality; is suitable for large-scale industrial production; and has good economic benefits and social benefits.