Removal of Iron from Acid Leaching Solution of Vanadium Slag by Complexation

In view of the high energy consumption in the process of roasting and low recovery rate of vanadium for the current vanadium extraction technologies,a new non-roasting process of pressure leaching of vanadium slag with waste acid from titanium dioxide production was put forward,and the extraction separation process of vanadium and iron in the leaching solution was investigated.The results show that the single-stage extraction rate of iron can reach 34.15% and the extraction rate of vanadium is less than 2% with up to 42.54 of separation coefficient for iron to vanadium,at pH=-0.86,25% of volume fraction for extraction agent N235,5:1 of volume ratio for organic to aqueous phase(V_O/V_A),10 min of shaking time and 140 g/L of Cl^- concentration by adding NaCl.The process can realize an effective separation of iron from the high iron-containing vanadium leaching solution.