Study on the Mechanism of Iron Removal by Magnetic Separation from Carbide Slag Based on Isa Mill Pretreatment

To improve the size uniformity of TiC-bearing carbide slag for subsequent chlorination and reduce iron-related risks, Isa mill grinding and wet magnetic separation were optimized. The results show that the grinding process parameters have a significant impact on the particle size distribution of the product. Under the optimal conditions of a grinding Isa mill speed of 400 rpm, a pulp concentration of 36%, and a medium filling rate of 50%, the content of the intermediate particle size of 100-250 mesh in the ground product can reach 65.95%, and the particle size distribution is relatively narrow compared to typical grinding methods. Microscopy indicates that metallic Fe is closely associated with part of TiC, leading to minor TiC entrainment during iron removal. At 0.01256 T, total Fe (TFe) removal in tailings achieved 56.82%, while TiC recovery remained 98.53%, defining a practical operating window that balances iron removal efficiency and TiC loss.