Permanent magnet disk separators

This paper deals with the physical principles involved in using belt type cylindrical separators in which the active elements are permanent magnet disks. Equations are derived for the sticking force of magnetic particles as a function of particle type and size, disk diameter, belt speed, and the magnetic properties of the disk. This leads to an equation for the point where the particles will separate from the belt. In addition, the capacity of a machine of a certain size can be calculated and the parameters set to their optimum ranges. These machines are very suitable for separating small particles of reasonably large paramagnetic susceptibilities. For large particles or weak susceptibilities very strong magnetic materials, such as cobalt samarium, must be used.