Separation of Magnetic Vanadium Slag and Vanadium Extraction by Calcification Roasting

Using MLA mineral phase analyzer and optical microscope,the compositions and iron distribution of magnetic vanadium slag with different particle sizes,and the influence of metallic iron（MFe） on roasting-acid leaching were investigated.The results show that magnetic vanadium slag is made up of MFe and high-Fe vanadium slag,occupying 35.36% and 64.64%,respectively.The recovery of vanadium will be obviously reduced when MFe is more than 2%.A method featuring grinding and screening of the magnetic vanadium slag for separation of metallic iron used for Fe V melting,and vanadium extraction from the residual high-Fe vanadium slag via calcification roasting-acid leaching was proposed in this paper.The recovery rate of vanadium in roasting-leaching process is more than 86.16%,realizing comprehensive utilization of vanadium and iron resources.