SU1651966A1 - Magnetic separator-analyzer of intermittent action - Google Patents

Abstract

The invention relates to the separation of materials according to magnetic properties and can be used in the beneficiation of iron ores. The goal is to improve the quality of the analysis by separating the magnetic product into fractions with different magnetic properties. The device comprises a separation chamber 4 mounted above a magnetic system having the possibility of vertical movement. The magnetic system is made in the form of a cage 1 rotating around a vertical axis, on which magnets (M) are placed. The main magnets (M) 8 are located radially and have the same polarity. Each additional M 9 is located between two M 8 and has the opposite sex

Description

Fig 1

ness Each M 9 is shorter than M 8. All M 8 and 9 are magnetized in a vertical plane, and their outer ends are located on the same circle. Power is supplied to the cone feeder. 5.. The yoke 1 with the M 8 and 9 rotates from the electric motor 2. Under the action of a rotating magnetic field, the magnetic particles move towards the field in a spiral to the center of the yoke 1. At the ends

M 9 collects particles with the highest magnetization, at the ends of M 8 particles with less magnetization. In the center of the holder 1, particles are collected with a minimum magnetization. Non-magnetic particles accumulate along the periphery of the cage 1. The material is separated in annular zones, where the field and its gradient change dramatically. 1 hp f-ly, 2 ill.

The invention relates to the section of materials on magnetic properties and can be used in the enrichment of iron ores.

The purpose of the invention is to increase the quality of the analysis by separating the magnetic product into fractions with different magnetic properties.

FIG. 1 shows the proposed magnetic separator-analyzer, a general view; in fig. 2 - magnetic separator system.

The device contains a yoke 1 mounted on a shaft connected to an electric motor 2. A magnetic system is fixed on the yoke. Above the magnetic system there is a non-magnetic plate 3 on which a separation chamber 4 with a conical feeder 5 and a funnel 6 is mounted. A lifting device 7 provides vertical movement of the separation chamber relative to the magnetic system. The magnetic system (Fig. 2) contains the main 8 and additional 9 magnit located

radially on the periphery of the holder 1.

Additional magnets 9 are shorter than the main magnets 8, the polarity of the additional magnets 9 is opposite in sign to the polarity of the main magnets 8. The outer ends of all the magnets lie on the same circle.

The separator works as follows.

The material to be separated in powder form with the help of a container funnel 6 and a conical feeder 5 enters the separation chamber 4 in region A (Fig. 2). Under the action of an alternating traveling magnetic field, magnetic particles begin to move towards the moving magnets due to rotation around their horizontal axes along a spiral path.

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The trajectories are located towards the center of the separation chamber and are collected in ring-shaped areas B, C, D (Fig. 2). In each of these areas, there are particles that differ in their magnetic properties. This is explained as follows. A magnetic particle placed in an inhomogeneous magnetic field is acted upon by a force pulling it into the region of a stronger field. Under the action of this force, all magnetic particles from region A are transferred to region B. In this region, additional magnets 9 end, the field gradient and the field itself abruptly change, c. As a result, particles with the highest magnetization fall as if in a potential and are retained in this region, while particles with a lower magnetization value continue to move until the next potential we, which is in region B, i.e. at the point where the main magnets 8 terminate. Here particles with a lower magnetisation value are retained, while the rest move to region G. The location of additional magnets 9 radially on the periphery of the cage between the main magnets 8 allows the magnetic system field to be amplified, and the alternating polarity created by this arrangement allows you to extract weakly-magnetic components from the entire fraction placed in region A.

Example. Primary and secondary rectangular magnets are glued onto a nonmagnetic disk with a diameter of 21 cm. The main magnets have dimensions of 15x15x80 mm, additional magnets - 15x15x40 mm3. The main and additional magnets are magnetized in a vertical plane and are located radially on the disk, their polarities are anti-fire. Magnetic system for the preparation of ragpilozha barium ferrigon plates. The maximum magnetic field strength at the location of the substance to be separated is 2 I0 A / m. The electric motor drives a disk with a frequency of 5-10. For separation, the mineral product powder of oxidized ferruginous quartzites with a particle size of 0.01-0.1 mm was used. After 1 min after the start of rotation, the particles gathered in ring-shaped regions B, C, and G. The magnetic fractions were unloaded by installing scoops-collectors at the bottom of the separation chamber, into which the components collect as they move along the bottom of the chamber. In region A, a nonmagnetic fraction remained, which according to X-ray structural and chemical analyzes of quartz, fine hematite and hydroxide

Experiments have shown that with respect to the length of the primary and secondary magnets less than 1: 5, partial overlap of regions A and B is observed, which reduces the efficiency of dividing the magnetic phase into separate components, overlapping regions B and C, and for an aspect ratio of 1: 2 B and C are maximally separated from each other and the operation of the separator is most effective.

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gland. Ring B consists of,%: magnetite 48-50; hematite 20–25 and quartz 25 nents– lRI more than 4: 5 pro – 20–25. The magnetization of the products is 45.8 Gs-cm / g. Ring B consists of,%: hematite 70-75, quartz 20, magnetite 2-3 (magnetization 6.6 ГСX em / g). Ring G consists of,%: JQ quartz 60, hematite 39, magnetite 1 (magnetization 4.4 ГС СМ3 / g). The presence of the same minerals in the separated areas of the separation chamber is explained by incomplete opening of the grains.

When an artificial mixture consisting of minerals: magnetite, hematite, monoclinic and hexagonal pyrrhotites is used as a product, after 1 min of operation of the separator, their complete separation is observed, and hematite is concentrated in area A, magnetite in area B - monoclinic pyrrhotite, in region D - hexagonal pyrrhotite. Impurity of other minerals in certain areas did not exceed 1%. The number of rings (separation selectivity) can be changed by lifting the separation chamber (the device over the magnetic system with device h, the separation chamber being on a non-magnetic plate. To divide the magnetic phase into separate components, each time it is individually required to select the distance h between the magnetic system

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Claims (2)

1. Magnetic separator-analyzer of periodic action, including a separating chamber and installed under it with the possibility of vertical movement the magnetic system in the form of a rotatable cage around a vertical axis, on which vertically magnetized and radially arranged main magnets and additional magnets, differing in that, in order to improve the quality of the analysis due to the separation of the magnetic product into fractions with different magnetic properties, each additional The second magnet is located between the two main ones and has the opposite of them. 50 polarity and shorter than the core, while the outer ends of all magnets are located on the same circle. 2. The separator-analyzer according to claim 1, characterized in that 55 is provided with a cone-shaped feeder, with its tip upward and mounted above the chamber coaxially with it. 0 five 0 separation chamber. So, for example, when dividing magnetite and pyrrhotite when h 0, all magnetic particles are concentrated in area B (Fig. 2), at h 10 mm in area B, and at h 5 mm there is a division of the magnetic pelvis into individual components. In this case magnetite is concentrated in region B, pyrrhotite is concentrated in region B. The distance h, at which the magnetic phase is divided into separate components, depends on the strength of the field, my, divided minerals. It is chosen experimentally for each particular case. Experiments have shown that when the ratio of the length of primary and secondary magnets is less than 1: 5, partial overlap of regions A and B is observed, which reduces the efficiency of dividing the magnetic phase into separate components created by the magnetic system 1 and the magnetisation magnitude is 5 times higher: 5 pro Q overlap of areas B and C occurs, and with a ratio of lengths of 1: 2, areas A, B and C are maximally spaced from each other and the operation of the separator is most effective. Nenty- LRI respect to more than 4: 5 35 25 nenty- lRI respect more than 4: 5 pro jq 40 Invention Formula 1. Magnetic separator-analyzer of periodic action, including a separation chamber and a magnetic system installed under it with the possibility of vertical movement in the form of a rotatable casing around a vertical axis, on which vertically magnetized and radially arranged main magnets and additional magnets are fixed, that, in order to improve the quality of the analysis due to the separation of the magnetic product into fractions with different magnetic properties, each additional The second magnet is located between the two main ones and has the opposite of them. 0 polarity and shorter than the core, while the outer ends of all magnets are located on the same circle. 2. The separator-analyzer according to claim 1, characterized in that 5 is provided with a cone-shaped feeder, with its tip upward and mounted above the chamber coaxially with it. Fiyo.2