A system and method for producing high-purity energy storage materials for flow batteries from high-chromium vanadium slag

Abstract

The invention discloses a system and a method for producing a high-purity energy storage material for liquid flow batteries by using high chromium type vanadium residue. According to the present invention, through selective chlorination in a circulating fluidized bed, vanadium, chromium and iron in high chromium vanadium residue are converted into corresponding gaseous chlorides, and most of impurities such as manganese, titanium, silicon and the like in the vanadium residue are remained in the chlorinated residue so as to separate the valuable elements from other impurities; the gaseous chloride is subjected to high temperature dust collection to separate crude chromium trichloride, is subjected to medium temperature dust collection to separate crude ferric chloride, and is subjected to low temperature leaching to separate crude vanadium oxytrichloride; the crude chromium trichloride is subjected to volatilization purification to obtain high-purity chromium trichloride; the crude ferric chloride is subjected to volatilization purification to obtain high-purity ferric chloride; the crude vanadium oxytrichloride is subjected to rectification purification and catalytic oxidation to obtain high-purity vanadium pentoxide powder; and with the system and the method, the high-value comprehensive utilization of the high chromium type vanadium residue is achieved, and the high-purity energy storage material for liquid flow batteries is obtained through the one-step chlorination multi-stage recovery method.

Description

technical field

[0001] The invention belongs to the fields of energy and chemical industry, and in particular relates to a system and method for producing high-purity energy storage materials for liquid flow batteries from high-chromium vanadium slag. Background technique

[0002] Flow battery is a safe and reliable large-scale energy storage system, which has the advantages of high energy efficiency, easy system integration and scale-up. Among them, all-vanadium redox flow battery and iron / chromium redox flow battery are two battery systems with rapid development, and both have achieved battery modules above 10kW. All-vanadium redox flow batteries use vanadium pentoxide sulfuric acid solution as electrolyte; iron / chromium redox flow batteries use ferric chloride and chromium chloride hydrochloric acid solution as electrolyte; higher electrolyte purity can significantly reduce battery electrode Side reactions, so as to obtain higher energy conversion efficiency. With the r...

Images