Research on Removing Sodium from Extracted Vanadium Residue

The extracted vanadium tailings contain useful iron and vanadium,while they bring risk when it is used for iron-making process due to their high sodium content.To solve the problem,three methods such as leaching,reduction-magnetic separation and sodic reduction-leaching-magnetic separation to remove sodium had been studied.It is found out that pressure leaching with CaO can remove 80.5% of sodium from the tailing.When the tail is reduced at 800℃,iron is reduced into magnetite and hardly to be separated because of its tiny size.While the temperature is increased to 1 200℃,the magnetite is further reduced into metallic iron and then aggregate,leading excellent separation effect.Reducing the extracted vanadium tailing with sodium salt and coal powder can obtain simultaneous transformation of iron and vanadium.Then after leaching and magnetic separating processes,iron,sodium and vanadium are separated efficiently.Besides,sodium salt can be partly replaced by calcium salt.