微细赤铁矿粒间磁作用力的有限元计算

he theoretical formulations, which were derived from the magnetic dipole effective model, and finite element method, are important for researching magnetic force between mineral particles, moreover, for researching magnetic agglomeration. This paper presents a finite element method, and uses it to calculate the magnetic force between equal-diameter fine hematite particles under the external field of up to 5T. In the method the rotated magnetic field vector is served as boundary condition, which makes mineral particle coordinates remain static. The computational domain is divided several zones with different meshing densities, according to the different effects on the accuracy. Taken mineral particle spacing and magnetic rotation angle as variables respectively, the comprehensively comparison between the finite element method and the theoretical formulations is performed. The results show that, the theoretical formulations have high accuracy for the fine hematite particle; the shorter particle spacing, more satisfied calculated results the finite element method can provide; the computational error with fixed order of magnitude, which originates from the finite element method itself, leads to the calculation errors increases with increase of mineral particle spacing.