Abstract:The traditional method of vanadium extraction from vanadium slag is sodium vanadium extraction process, which uses ammonium salt as the medium to achieve the dissociation of anion and cation of sodium vanadate, but it will produce a large amount of ammonia nitrogen wastewater and sodium sulfate solid waste, resulting in serious environmental pollution, complex process and high cost in the vanadium product preparation process. Based on this, a technology of membrane electrolysis was proposed to treat vanadium-containing leachate, which allows sodium ions to diffuse to cathode, while vanadium remains in anode. Vanadium pentoxide product was obtained by hydrolysis, precipitation and calcination, and sodium hydroxide product was recovered by evaporation and concentration of catholyte. The effects of electrolytic voltage, electrolytic time and vanadium precipitation temperature were investigated systematically. The results show that under the condition of voltage of 5 V and electrolytic time of 135 min, 85% sodium in the leachate can be separated and recovered. The leaching solution after electrolysis was heated at 120 ℃ for 90 min, the vanadium precipitation rate can reach 99%. The obtained vanadium pentoxide products meet the requirements of industry standards.