Abstract: The separation of magnetic materials from converter vanadium-bearing slag in the process of pretreatment of it for hydrometallurgical vanadium recovery has been researched and moreover,the feasibility and optimization of magnetic separation and screen separation are discussed as well. It is concluded that the screen separation is better than magnetic separation since the magnetic material amount in non-magnetic material is decreased slightly and the quantity of vanadium-bearing slag wrapped into the magnetic material is greatly reduced.