Research on Leaching Vanadium from Vanadium and Titanium-bearing Tailings Produced in Reduction,Grinding and Separation of Vanadium-bearing Titaniferous Magnetite

A comparative research on the two vanadium extraction processes of sodium roasting and acid leaching is carried out in order to find a suitable way to extract vanadium from vanadium and titaniumbearing tailings generated in reduction,grinding and separation of vanadium-bearing titaniferous magnetite.The research shows that with the application of the sodium roasting process,the leaching rate of vanadium is only about 18% while with the acid leaching process,it can be higher than 70%.It can be concluded that it is suitable to employ the acid leaching process for vanadium extraction from the vanadium and titanium-bearing tailings.Material characteristics together with physical and chemical variation in the process of vanadium extraction indicate that through the process of sodium roasting,vanadium could be wrapped with complex insoluble compounds during roasting while it won't happen during pre-oxidation roasting of the acid leaching process,which is the main reason for its higher vanadium leaching rate.