Method for producing high-purity electrolytic solution in vanadium battery

摘要

Disclosed herein are a system and method for preparing a vanadium battery high-purity electrolyte, comprising preparing a low-valence vanadium oxide having an average vanadium valence of 3.5 by means of liquid phase hydrolysis and fluidization reduction with vanadium oxytrichloride as a raw material, adding clean water and sulfuric acid for dissolution, and further performing activation by using ultraviolet to obtain the vanadium electrolyte, which can be directly used in a new all-vanadium redox flow battery stack. The high-temperature tail gas in the reduction fluidized bed is combusted for preheating of the vanadium powder material, so as to recover the sensible heat and latent heat of the high-temperature tail gas, and the sensible heat of the reduction product is recovered through heat transfer between the reduction product and the fluidized nitrogen gas. An internal member is arranged in the reduction fluidized bed to realize the precise regulation of the valence state of the reduction product, and ultraviolet is used to activate the vanadium ions, thereby improving the activity of the electrolyte. The system and method have the advantages of short process, high efficiency and good cleanliness, stable product quality, etc. and is applicable to large-scale industrial production.