Selective leaching of vanadium from V-Ti magnetite concentrates by pellet calcification roasting-H2SO4 leaching process

A novel method of pellet calcification roasting-H2SO4 leaching was proposed to efficiently separate and extract vanadium (V) from vanadium-titanium (V-Ti) magnetite concentrates. The leaching rate of V is as high as 88.98%, while the leaching rate of impurity iron is only 1.79%. Moreover, the leached pellets can be used as raw materials for blast furnace ironmaking after secondary roasting. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy with energy dispersive X-ray spectrometry (SEMEDS) analyses showed that V3+ was oxidized to V5+ after roasting at 1200 degrees C, and V5+ was then leached by H2SO4. X-ray diffraction (XRD) analyses and single factor experiment revealed a minimal amount of dissolved Fe2O3 during H2SO4 leaching. Therefore, a high separation degree of V and iron (Fe) from V-Ti magnetite concentrate was achieved through H2SO4 leaching. Compared with the traditional roastingleaching process, this process can achieve a high selectivity of V and Fe, and has excellent prospects for industrial production. (C) 2021 Published by Elsevier B.V. on behalf of China University of Mining & Technology.

Automated summary

A novel method of pellet calcification roasting-H2SO4 leaching was proposed to efficiently separate and extract vanadium (V) and impurity iron from vanadium-titanium (V-Ti) magnetite concentrates, achieving a high degree of separation between V and iron. The leached pellets can be used as raw materials for blast furnace ironmaking, showing excellent prospects for industrial production. Compared with traditional processes, this method has high selectivity for vanadium and iron.