Melkonova I. Disc Magnetic Separator with Improved Unloading Conditions

The thesis is devoted to the solution of the curren scientific problem of improvement of unloading conditions of Disk Separators with magnetic systems that is constructed on the basis of permanent magnets. Bulk substances are transported by belt conveyors. Unloading conditions are improved due to the using of advanced structures of magnetic systems and shaping of a working magnetic field with a preset topology. The mathematical description of the operating mode of magnetic separators is taken further development in this paper. Based on this description the Disk Magnetic Separator obtained new-made analytical expression that approximates the results of calculations to real processes and takes into account the basic geometric dimensions of the separator working space, permanent magnets material and parameters of bulk material, conveyor belt speed. For the first time the rational characteristics (shape and geometric dimensions) of the permanent magnets of the magnetic system of the disk separator of new design were determined with using the method of multivariate numerical-field calculations taking into account the spatial distribution of a force function for the magnetic field. Computational and experimental researchs of operating mode of the Disk Magnetic Separators were carried out. The dynamic problem of ferromagnetic solid motion in the working space of the Disk Magnetic Separator is formulated. The calculated relation is obtained which connects the basic geometric dimensions of the working space and takes into account the material of permanent magnets, parameters of bulk material and ferromagnetic solids and conveyor belt speed. The results thus obtained are compatible with experimental results and in practice of the known Magnetic Separation Devices with excitation of the working magnetic field from permanent magnets. In conclusion the direction of improvement of the Disk Magnetic Separator with the use of the combined magnetic system with ferrite magnets on the peripheral disk is offered. This will reduce the departure range of ferromagnetic inclusions and ensure their entry into the unloading zone at a constant speed of rotation of the non-magnetic unloading disk.