SU1592043A1 - Magnetic separator - Google Patents

Description

The invention relates to the beneficiation of minerals and is intended for the magnetic enrichment of finely ground highly magnetic ores in the dry mode. The purpose of the invention is to increase the separation efficiency. In the casing 1 of the separator is a drum (B) 2, inside of which is placed a magnetic system 3 of magnets 4 of alternating polarity. On B 2 there is an induction grating (P) 5,

installed with shock absorbers 6. The working elements of P 5 are made of magnetic soft steel strips, which are located at a distance from each other, a multiple of the step of the magnets 4, and at a distance from the surface B 2 equal to 0.1-0.2 of the pitch of the magnets 4. Shock absorbers 6 are flat springs and fitted with sliders with clamps in the form of screws. During rotation of B 2, induction Р 5 enters the resonant mode and nonmagnetic floccules are affected by the total moment of mechanical forces of oscillating working elements P 5 and the oscillating gradient of the magnetic field, destroying the magnetic floccules. The change in the position of the sliders 9 on the shock absorbers 6 provides a resonant mode of operation P 5, in which the natural frequency of the shock absorbers 6 coincides with the frequency of the magnetic field of the separator. 1 hp ff, 3 ill.

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The invention relates to the beneficiation of minerals, in particular to the magnetic enrichment of finely ground highly magnetic ores in the dry mode.

The purpose of the invention is to increase the efficiency of separation,

Fig, 1 schematically shows the proposed separator; figure 2 - node I in figure 1; on fig.Z - node II in figure 2.

The separator includes a housing 1, a working body in the form of a drum 2, a stable magnetic system 3 consisting of permanent magnets 4 of alternating polarity and an induction grid 5 installed above the drum 2 using shock absorbers 6.

The induction grid 5 (figure 2) consists of rings 7 and working elements 8 fixed to them in the form of thin strips of soft magnetic steel. The rings 7 are located around the drum 2 and are connected to the latter with the help of shock absorbers 6. Shock absorber b is a flat spring and is equipped with a slider 9 (FIG. 3). The slider 9 is fixed in a certain place of the spring 6 by a screw 10, the Rings 7 are located around the drum 2 in such a way that the distance from the bottom edge of the working element 8 to the surface of the drum 2. is 0.1-0.2 pole steps of the magnetic system 3. The distance between the workers element: the lattice 8 is 5 times the pole of the magnetic system 3.

The separator works as follows.

The source material is fed to the rotating drum 2. Magnetic particles are attracted to the drum 2, and the main mass of non-magnetic is discarded from the drum 2 by centrifugal forces. The magnetic particles attracted to the drum 2 are grouped into floccules, which move together with the drum 2 to the place of discharge of the magnetic fraction. Along the path of motion, floccules are affected by a variable in magnitude and direction magnetic field. The frequency of this field depends on the pitch of the poles of the magnetic system 3 and the frequency of rotation of the drum 2. In addition, the floccules are acted upon by the centrifugal forces generated by the rotating drum 2. The magnitude of the centrifugal forces is chosen such that separation occurs in the "subcritical" mode, when the magnitude of the centrifugal force 5-10 ° (below critical, when magnetic floccules come off). In this mode, the magnetic

floccules fly over drum 2. During the flight, floccules rotate at a frequency equal to the frequency of the running field of the separator and meet working elements 8 of the induction grid 5. The induction grid 5 under the influence of an alternating magnetic field and mechanical forces generated by shock absorbers 6 enters resonance. and the working elements 8 of the grid 5 oscillate vigorously with respect to the drum 2. At the moment of passing the working element 8 above the pole, magnetic floccules are attracted to it. Under the influence of intense vibrations of the working element 8, floccules are destroyed and non-magnetic grains are released from them. Near the next pole, the material regrouped into a new floccula richer in magnetite and the process repeats. The released non-magnetic grains are removed from the process by centrifugal forces.

To ensure the resonant mode of operation of the induction grid 5, the natural frequency of oscillation of shock absorbers b must coincide with the frequency of the rotating magnetic field of the separator. This is achieved by changing the position of the sliders 9 on the shock absorbers 6.

The total effect on the magnetic floccules of the mechanical forces of the oscillating working elements 8 of the lattice 5 and the oscillating intensity gradient increases the separation efficiency.

Claims (2)

Claim 1. Magnetic separator, which includes a rotatably mounted drum with a magnetic system of alternating polarity magnets placed inside it, and an induction lattice, whose working elements consist of magnetic soft steel strips mounted circumferentially over the drum surface, characterized in that separation efficiency, the distance between the working elements of the induction grid is a multiple of the magnet pitch, and the induction grid is installed on the drum by means of shock absorbers at a distance from the surface of the drum, equal to 0.1-0.2 step magnets. 2. The separator according to claim 1, characterized in that it is provided with sliders with clamps in the form of screws installed with the possibility of movement on the shock absorbers, the latter being made in the form of flat springs. I 1592043