New Technology of Magnetic Separation of Iron Ore---Magnetic Magnetic Field of Magnetic Separator (1)

The magnetic separation process is performed in the magnetic field of the magnetic separator sorting zone, so the magnetic field strength and its distribution state of the sorting zone have an important influence on the magnetic separation process.
The open magnetic field magnetic field is directly derived from the magnetic source magnetic pole; and the magnetic medium magnetic field in the closed magnetic system is provided by the induced magnetic field of the magnetic medium magnetic pole. One of the characteristics of the former is that the magnetic force force is longer than the latter, so the open magnetic system can sort a larger piece of magnetic ore.
(1) Open magnetic field magnetic field

The magnetic field of the most commonly used cylindrical magnetic separator is a typical open magnetic field. Fig. 1 is a view showing the arrangement of open magnetic poles. The H of this magnetic system along the χ and y directions can be calculated by

Where H _x and H _y ——— magnetic field strength at x and y, A/m;
H _o ———the magnetic field strength on the pole face (pole gap surface), A/m;
ι———pole distance, m.
On the symmetry plane of the magnetic pole, a=90°, H _x =0; in the plane of symmetry of the gap, a=0°, H _y =0. At this time, H _y and H _x are H _y =H _o exp-πy/ ι
H _x =H _o exp-πy/ι (2)
At the polar level (y = 0), the formula 1 can be expressed by:
H _x =H _o sinπx/ι
H _y =H _o cosπx/ι (3)
When the surface of the magnetic pole is arranged in a cylindrical plane, the magnetic field unevenness coefficient C (m ^-1 ) is equal to C=Ï€/ι+1/R ₁ (4)
Where R ₁ ———the radius of the cylinder, m.
When R ₁ →∞, when the surface of the magnetic pole is arranged in a plane C=Ï€/ι (5)
For a plane-arranged magnetic system, the magnetic field force F _my (A ² /m ³ ) is obtained by (2) as F _my =(HgradH) _y =CH _O exp(-2cy)[next]
(2) Closed magnetic field magnetic field
A Single-layer inductive magnetic field A magnetic circuit is formed by placing an integral inductive magnetic medium (such as a roller or a turntable) between the magnetic source poles. The most common types of poles consisting of a planar pole or a trough pole with a single or multiple toothed poles (flat or pointed pole).
2 is a structural view of a hyperbolic magnetic pole pair. The magnetic field strength of this magnetic pole can be calculated by the following formula

For a magnetic system composed of a plurality of hyperbolic magnetic poles, the change of the magnetic field strength on the magnetic symmetry plane can be approximated by the equation (7), and the value is lower than that of the single magnetic pole pair. Thus, when calculating the magnetic field force according to the formula (8), a correction factor of 0.7 to 0.8 should be introduced.
B Multi-layer inductive magnetic field In order to improve the processing capacity of the magnetic separator, most modern magnetic separators use multiple layers of induced magnetic fields. Commonly used magnetic media have a slotted plate. Balls, stencils, filament woven meshes and fibers (steel wool).
The structure of the tooth plate of the tooth plate is shown in Fig. 3. The two-tooth magnetic field can be calculated using an empirical formula:

(9) applies to the polar distance ι≈ (0.45 ~ 0.46) s and the tip angle β = 60 ° ~ 105 °.
The magnetic field force F _my is calculated by

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