Extraction of ferromagnetic impurities from bulk agricultural materials

The work is devoted to actual problem of extrac-tion of ferromagnetic impurities from highly dis-persed agricultural materials such as flour, fine grains with the help of magnetic concentrators. Open multipolar systems have shown their ineffec-tiveness in a number of indicators. In this regard, the use of multigradient magnetic separators will significantly increase the separation efficiency. The empirical approach in creating designs does not allow predicting the effectiveness of recovery of ferromagnetic particles of granular agricultural ma-terials and positive result isn‟t always achieved in the creation of new devices. Possible forms of plots are shown on which there is picking up magnetic particles, i.e. the "centers" of coagulation. The val-ues of the field strength created by cylindrical mag-netic bars are given. An important element in the calculation of electromagnetic separator with hubs is to determine the effectiveness of its work, ex-pressed in terms of the relationship with the main electrical parameters of the device. The system of equations of the deposition of fine particles in the "center" of coagulation is presented. These equa-tions were also investigated numerically by varying the particles‟ parameters, environment and field. The dependence of the relative distance from the field strength, and the angle between the field vec-tor and the line of motion of the particle to the "cen-ter" is determined. It is proved that near the "cen-ter" there are two volumes of which small particles will settle to the respective poles. Taking into ac-count that the volumes are spherical and symmet-rical, the gain of weight of the "center" is defined at the expense of settled particles on it.