When magnetic fluid, as a separation medium, is placed in an inhomogeneous magnetic field (or the combined field of magnetic field and electric field), the method of separating different substances by using its quasi-weighting property is called magnetic fluid separation method. Can be divided into MHSS；; Magnetohydrodynamic separation (MHDS).

1) Hydrostatic separation method: Hydrostatic separation method is a separation method (flotation or sinking) in which magnetic fluid is used as separation medium and minerals are separated according to different densities and magnetic susceptibility. 2) Magnetohydrodynamic separation: It is a mineral separation method that uses strong electrolyte solution as separation medium, and under the combined action of magnetic field and electric field, according to the difference of density, magnetic susceptibility and conductivity between minerals.