Dynamic Magnetization Simulation and Accurate Magnetic Force Calculation of Magnetic Mineral Particles
Addressing the issues of existing micromagnetic simulation software's inability to directly calculate magnetic forces,the inaccuracy of magnetic force calculations on magnetic particles under macroscopic magnetic fields,and the unclear depiction of dynamic magnetization processes,this study employs micromagnetic theory and numerical simulation technology to refine the calculation methods for magnetic forces on magnetic particles.In collaboration with the multi-physics simulation soft-ware COMSOL,a software tool has been developed utilizing its physical field developer,app developer,and a magnetic field without electric current for precise force calculation on magnetic particles.This paper elaborates on the principles of the mi-cromagnetic simulation software for magnetic particles and compares it with the professional software MERRILL in the state of spontaneous magnetization.It concludes with a comparison of the accuracy between traditional simulation methods and mi-cromagnetic force calculation methods for determining the magnetic force on irregular magnetic particles of 100 nm under a uni-form magnetic field.The research findings indicate that,when simulating cubic magnetic particles of 80 nm with an identical grid size of 5 nm,both pieces of software show consistent spontaneous magnetization states across different initial conditions.The dynamic magnetization process of octahedral magnetic particles in a changing magnetic field is demonstrated using hystere-sis loops.Under a uniform magnetic field,the magnetic force calculation method using micromagnetism improves the calculation accuracy from 10-3 orders of magnitude to 10-11 orders of magnitude compared to the conventional calculation method;The soft-ware serves as a powerful tool for advancing the study of magnetic separation theory from a micromagnetic perspective,further facilitating the investigation of the dynamic magnetization process of magnetic particles during magnetic separation.This con-tributes significantly to enhancing the accuracy of calculating the magnetic force of magnetic particles.
micromagnetic simulationmagnetic force calculationsecondary developmentmineral sorting
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