Two ferrite permanent magnets fixed on an iron yoke were arranged with suitable distance and angle. A nonmagnetic body placed in a magnetic fluid between these magnets receives a magnetic levitation force towards a minimum point of magnetic field. Thus the magnetic fluid could be regarded as dense medium suspension of high specific gravity.We reported about the separation of glass and porcelain in the first paper “Sink and Float Separation with Magnetic Fluid”. However, ceramic particles smaller than 5mm in diameter couldn't be separated satisfactory. Here, the relation between particle size and separation efficiency was investigated. Sphalerite, Pyrite and Galena whose size was from 3 to 100 mesh were used. Specific gravities are about 4.5 and 7.5 respectively. A water-base magnetic fluid was used as a medium.When put into this fluid, the mixture of those nonmagnetic minerals separated, except for particles smaller than a certain size. It was found that the lowest limit of the separation size depended upon the difference of specific gravity of them. And the smaller the difference was, the larger the limit size was. The principal reason for nonseparation of fine particles is that each nonmagnetic particle in the magnetic fluid under a magnetic field adheres to each other in the direction of the line of magnetic force. However, they repulse each other when positioned along the vertical direction of the line of magnetic force. In order to use this repulse force, we therefore constructed trial equipment to separate adhered particles by turning the cylinder in which the particles were placed in the magnetic fluid. As a result, we were able to separate the major portions of Pyrite and Sphalerite particles larger than 100 mesh size.