Abstract Body

High gradient magnetic separation (HGMS) has been recognized as an effective method for extracting magnetic fine particles from various powder mixtures [1]. However, the effect of eddy currents on the particles during HGMS has not been adequately explored in previous research. To gain a more comprehensive understanding of this phenomenon, we conducted particle trajectory simulations using finite element analysis and numerical methods to assess the influence of eddy currents on the magnetic separation efficiency. The results show that the repulsive force induced by eddy currents affect the magnetic separation to some extent. This repulsive force is mainly influenced by factors as particle size, electrical conductivity and magnetization of particles. The particles with low magnetization experience a more pronounced impact from the repulsive force in contrast to those with higher magnetization. We also observed that the magnetic field gradient produced by the magnetic wires also plays a role in influencing eddy currents. This phenomenon is primarily attributed to the magnetic wire size and the applied magnetic field. These results are helpful for improving the accuracy and efficiency of HGMS. By considering the effect of eddy currents, the magnetic separation system can be optimized and its performance improved.

References

[1] Chen H and Miura O 2022 Removal of magnetic fine particles from carbon black powder by high gradient magnetic separation under dry condition IEEE Trans. Appl. Supercond. 32 3700605