Abstract: 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.