(1) Open magnetic system The open magnetic system refers to a magnetic system in which magnetic poles are arranged adjacent to each other and there is no inductive magnetic medium between the magnetic poles. According to the arrangement of magnetic poles, it is divided into curved magnetic system and planar magnetic system. As shown in Figure 4-5-16, the former is used for the weak magnetic field cylindrical magnetic separator, and the latter is used for the belt magnetic separator. The open magnetic system has a long magnetic path, large magnetic resistance, large magnetic flux leakage, low magnetic field strength, and a weak magnetic field magnetic separator for sorting ferromagnetic minerals. According to the basic characteristics of the magnetic field, the magnetic field strength at any point [x, y] in the open magnetic field is: As can be seen from the above equation, the magnetic field non-uniformity coefficient c is theoretically the magnetic field gradient at the unit magnetic field strength. It is a function of the pole distance l, a function of the cylindrical magnetic system, or the radius R of the cylindrical surface. Due to the influence of the polar distance and the radius of the magnetic system surface, the non-uniform coefficient c is more convenient than the magnetic field gradient to represent the non-uniformity of the magnetic field. The magnetic field force at any point on the plane of symmetry of the pole or the plane of the pole gap is: From this formula, when the magnetic field strength of the pole face is constant, the magnitude of the magnetic field force is determined by the non-uniform coefficient c and the position y. When R is constant, it is only determined by the pole distance l and the position y. The above formula is obtained under specific conditions. The conditions are: the magnetic pole head is an arc of approximate radius; the ratio of the magnetic pole width to the magnetic pole gap is within 1.0-1.5. For the actual magnetic separator magnetic system, the above two conditions are difficult to meet, therefore, the theoretical non-uniform coefficient is multiplied by the correction coefficient k () (See Table 4-5-5) for correction. (2) Closed magnetic system The closed magnetic system is a magnetic system in which magnetic poles are arranged oppositely. The sorting space is the air gap between the magnetic poles. Generally, the air gap is small, the magnetic flux of the magnetic flux passing through the air gap is small, and the magnetic flux leakage is small, so the sorting space has a strong magnetic field and is used for sorting a strong magnetic separator of weak magnetic minerals. However, this magnetic system has a low processing capacity. The closed magnetic system in the strong magnetic field magnetic separation device is shown in Figure 4-5-17. In the closed magnetic system, a single layer having a shaped induction magnetic pole forming the magnetic pole and the original closed system of a magnetic iron-based magnetic medium between the opposing magnetic poles with particular shapes. For the former magnetic system, the sorting space formed is a single layer, and the original magnetic pole is often a planar or trough magnetic pole, and the sensing is mostly a sharp tooth or a flat tooth pole, so that the magnetic flux is formed in a reasonably dense state at the sensing pole. , the sorting space produces a strong magnetic field and a large magnetic field gradient. The pair of magnetic poles are as follows (see Figure 4-5-18) (a) consisting of a planar magnetic pole and a single pointed inductive tooth; (b) consisting of two hyperbolic magnetic poles; (c), ( d) consisting of a planar original magnetic pole and a plurality of flat or pointed inductive teeth; (e); (f) by trough The original magnetic pole is composed of a plurality of flat or pointed inductive teeth; (g) is composed of a curved pole and a concave pole. The magnetic system with a special shape of ferromagnetic medium between the opposite magnetic poles can further improve the magnetic field gradient and the magnetic field force. Common magnetic media include balls, rods, tooth plates, steel mesh and steel wool, etc., and the radius of curvature of these magnetic media As the number becomes smaller, the single magnetic field gradient and the magnetic field force increase in turn. The magnetic field characteristics of the closed magnetic system are related to the magnetic pole form and the filling medium characteristics, which are relatively complicated. For detailed understanding, refer to the related magnetic circuit and magnetic separation theory.
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Magnetic system classification of magnetic separator
The magnetic source that generates the magnetic field in the sterilizer is called the magnetic system. According to the arrangement of the magnetic poles in the magnetic system, the magnetic system can be divided into an open magnetic system and a closed magnetic system.