RU2419493C2 - Multichamber magnetic separator with travelling magnetic field - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to dressing of mineral resources. Proposed magnetic separator comprises magnetic system arranged on both sides of separation chambers and made up of magnetic units with alternating magnetic polarity or of alternating single and twin magnetic units wherein magnetic polarity of single units is opposite that of twin magnetic units. Magnetic units are arranged between nonmagnetic plates along disk circumference of 360° at a distance between units smaller than their width. If magnetic system has alternating magnetic polarity, then units arranged on one line and on both sides of separation chamber feature codirectional vectors of magnetic induction. If magnetic system is made up of alternating single and twin magnetic units, then those on both sides of separation chambers are displaced along the circumference through the angle that allows single units to stay on line crossing the twin units division center and to have codirectional vectors of magnetic induction.

EFFECT: higher intensity of travelling magnetic field in separation zone, reduced costs and higher specific efficiency.

3 dwg

Description

The proposal relates to the field of enrichment of magnetic minerals by magnetic separation methods, selective separation according to the magnetic properties of finely divided mineral powder mixtures in the form of pulps.

A known separator of mineral mixtures with rotating disks located on both sides of the separation chamber, on which at an angle of 90 ° are placed permanent magnets in the form of rectangular prisms [1]. The disadvantage of this separator is the low productivity and loss of part of the useful product with separation tails due to the insufficient intensity of the magnetic flux in the separation chamber.

The technical result of the invention is to increase the intensity of a traveling magnetic field in the separation zone due to the placement of permanent magnets with alternating magnetic polarity on both sides of the separation chamber, combining the effective destruction of magnetic flocculi in rotating magnetic fields with high productivity and selectivity of separation of the separated products while reducing cost. enrichment process.

The specified technical result is achieved due to the fact that in the magnetic separator the magnetic system is located on both sides of the separation chamber and is made of magnetic blocks with alternating magnetic polarity or alternating single and double with minimal clearance magnetic blocks with magnetic polarity of single blocks opposite to magnetic polarity double blocks, and the magnetic blocks are placed between non-magnetic disks along an arc of a disk circumference 360 ° at a distance between the blocks less than their width, If the magnetic system is made with alternating magnetic polarity, then the blocks located on both sides of the separation chamber and located on the same line have the magnetic direction of the magnetic induction vectors, while if the magnetic system is made of alternating single and double magnetic blocks, then the magnetic blocks on both sides separation chambers are displaced along an arc of a circle by an angle, which ensures the location of single blocks on a line passing through the center of division of double blocks and having co-directional the vectors of magnetic induction.

Figure 1 presents a schematic view of a multi-chamber magnetic separator (end view) and along section AA (Figure 2). Between the non-magnetic disks 1, mounted on the axis of rotation 2, are placed magnetic blocks 3 made of magnetized plates of barium ferrite. Magnetic blocks have alternating magnetic polarity and are located around the disk circumference 360 ° with magnetic induction vectors directed parallel to the axis of rotation. The rotation frequency can be regulated over a wide range using a unit with a variable frequency of power supply of the electric drive (not shown in FIG. 1).

The separation chamber 4, made of non-magnetic material, is located between the disks with magnets and is equipped with a feed channel for the separated product 5, output of non-magnetic tails 6 and magnetic concentrate 7. The inner walls are covered with wear-resistant plastic with a rough surface. Disks of magnetic steel 8 are placed in the unloading zone, equipped with slots and designed to lead the magnetic concentrate outside the magnetic system and brought into rotation from the axis of rotation of the disks 2. The number of separation chambers is determined by the designed capacity of the separator and its dimensions.

Depending on the separation tasks, the magnetic blocks have a different arrangement on the disks.

Figure 2 presents a schematic view of a separator consisting of three disks and two separation chambers. Magnetic blocks located on both sides of each chamber have the same direction of magnetic moments 9, 10 along the generatrix of the disk. In Fig.3, the magnetic system has dual magnetic blocks 11, 12 with the same magnetic polarity, alternating with single blocks of opposite magnetic polarity. The magnetic blocks on the other side of the separation chamber are offset so that the unit blocks 14 are located opposite the twin blocks 11, 12 and have the same direction of the magnetic induction vectors.

The separator operates as follows. The separated product in the form of pulp is fed through the loading nozzles 5 into the separation chambers. Under the action of a traveling magnetic field created by rotating disks with permanent magnets fixed to them, the product is divided into magnetic and non-magnetic components. In this case, there is multiple magnetization reversal and rotation of magnetic particles, contributing to the separation of magnetic, weakly magnetic and non-magnetic grains. Further movement of particles (due to their rotation) occurs towards the movement of the magnets along the walls of the chamber to the unloading zone, where they are attracted to rotating ferromagnetic disks and removed from the zone of action of the magnets.

When using the magnetic system of the second option, alternating magnetic forces are created in the separation zone (magnetic induction vectors 15, 16 are directed at an angle, which leads to the creation of an alternating magnetic field gradient), leading to additional multiple movement of magnetic particles from one chamber wall to another (effect " rinsing ”), which increases the selectivity of the separation of particles and to obtain magnetic concentrates of high purity.

The first type of magnetic system is most suitable for the first stage of magnetic separation, and the second for the last cleaning.

The use of several separation chambers and magnets located on both sides of their side surfaces using a single magnetic system to create magnetic fields in two chambers, as well as creating conditions for the multiple movement of magnetic particles between the walls of the separation chambers, allows a highly efficient separation process with high selectivity separation.

Thus, this technical solution will allow the following.

1. To increase the intensity of the traveling magnetic field in the separation zone by placing permanent magnets with alternating magnetic polarity on both sides of the separation chamber.

2. Combine the effective destruction of magnetic floccules in rotating magnetic fields with high productivity and selectivity of separation of the separated products.

3. To reduce the cost of the enrichment process.

4. Increase the specific productivity of the separator.

Information sources

Patent RU 2170620 C1,

B03C 1/12, 2001.

Claims (1)

A magnetic separator containing a magnetic system, characterized in that the magnetic system is located on both sides of the separation chambers and is made of magnetic blocks with alternating magnetic polarity or alternating single and double with minimal clearance magnetic blocks with magnetic polarity of single blocks of opposite magnetic polarity of the double blocks moreover, magnetic blocks are placed between non-magnetic disks along an arc of a disk circumference 360 ° at a distance between the blocks less than their width, if magnetic the system is made with alternating magnetic polarity, then the blocks located on both sides of the separation chamber and located on the same line have the magnetic direction of the magnetic induction vectors, while if the magnetic system is made of alternating single and double magnetic blocks, then the magnetic blocks on both sides of the separation chambers are displaced along an arc of a circle by an angle, ensuring the location of single blocks on a line passing through the center of division of the double blocks and having co-directional magnetic vectors tnoj induction.

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