Abstract
In this study, V was recovered from VTM(Vanadium titano-magnetite) minerals through CaO roasting and hydrometallurgy process. The CaO roasting process transforms the phases of Fe3O4 and FeTiO3 into CaFeOx and CaTiO3, respectively, and particularly facilitates the leaching of V. 10 wt% of CaO was mixed with VTM minerals and roasted for 3 hours at 1150 °C in an air atmosphere, and the roasted product was subjected to leaching process by sulfuric acid. As a result of leaching, 86% of V was leached by reacting for 6 hours at 1M sulfuric acid, 70℃, and 10% solid-liquid ratio, and at this time, the leaching efficiency of iron and titanium was 10%. A solvent extraction process was used to selectively separate V from iron and Ti by Alamine 336 as an extractant. Extraction was performed according to the concentration of Alamine 336 and the acidification rate. 80% of V was selectively extracted from Fe and Ti through 30% acidified 0.7M Alamine 336 and O/A ratio 1 through 3 stage countercurrent extraction. The recovered V is expected to be applied to industries related to vanadium redox flow batteries(VRFB) or energy storage system(ESS).
