Abstract: In view of the existing serious problems in current permanent magnetic roll magnetic separator, such as magnetic flux leakage, low magnetic field intensity etc, three new types of permanent magnetic roll magnetic system structure of Yoke-Cone(YC), Yoke-Round(YR), and Non-Yoke(NY) are proposed.And their magnetic field properties are simulated by Magnet software.The results showed that: the max value of circumferential magnetic field intensity and magnetic field gradient intensity around the roll surface, the max initial value of radial magnetic field intensity and magnetic field force decrease as the YC→YR→NY subsequence; The working depth value of radial magnetic field intensity decreases as YR→NY→YC subsequence, while that of radial magnetic field force decreases as YR→YC→NY subsequence.It shows that yoke can greatly improve the magnetism gathering and weaken magnetic flux leakage.Yoke-cone has a more significant effect on magnetism gathering, but its working depth is greatly reduced.The simulation results reflect that YR has best overall magnetic field characteristics, followed by YC and NY in order.

Key words: Permanent magnetic roll magnetic separator, Annular splicing magnetic system, Magnetic properties, Simulation analysis, Magnet software