RU2319549C1 - Magnetic separator - Google Patents

Abstract

FIELD: mining industry; other industries; production of the magnetic separator used for separation of the material according to their magnetic properties.

SUBSTANCE: invention is pertaining to separation of the material according to their magnetic properties and may be used at reprocessing of the magnetite ores. Invention allows to improve efficiency of crushing of magnetic conglomerates at the expense of action of the magnetic forces with the variable value of the radial component and the inversion tangential component during movement of the separated product by the gyrating drum concerning the magnet system. The separator includes: the non-magnetic drum mounted with the capability of rotation; the bath; the loading and unloading tools; the magnet system located inside the drum and made in the form of the mounted on the magnetic conductor the main permanent magnets of the rectangular shape and the fixed on the surface the magnets and additional magnets made in the form of rectangular prisms and fixed on the surface of the main permanent magnets. Main and additional magnets have similar magnetic polarity. Prisms of additional magnets have smaller width, than main permanent magnets and, and are mounted in radial direction with clearance between them.

EFFECT: invention ensures increased efficiency of crushing of magnetic conglomerates.

5 dwg, 1 tbl

Description

The invention relates to the separation of materials by magnetic properties and can be used in the processing of magnetite ores.

Known magnetic separator, including a rotatably mounted non-magnetic drum, a bath, loading and unloading devices, a magnetic system located inside the drum, made in the form of permanent ceramic magnets of rectangular shape mounted on a magnetic circuit [1].

However, a disadvantage of the known magnetic separator is its low separation selectivity due to the inefficient use of inversion zones formed over round holes in the magnetic blocks.

The technical result to which this technical solution is aimed is to increase the efficiency of the destruction of magnetic conglomerates due to the influence of magnetic forces with a radial component and a variable inverse tangential component when the separated product is moved by a rotating drum relative to the magnetic system.

This result is achieved due to the fact that the magnetic separator, which includes a non-magnetic drum rotatably mounted, a bath, loading and unloading devices, a magnetic system located inside the drum, made in the form of permanent rectangular magnets mounted on the magnetic circuit, is equipped with fixed to the surface of the main magnets and made in the form of rectangular prisms with additional magnets, and the main and additional magnets are made with the same magnetic field polarity and prism additional magnets are made of smaller width than the main magnets and are installed in a radial direction with a gap between them.

In Fig.1 is a General view of the device, Fig.2 is a view A, Fig.3 is a schematic view of two magnetic blocks (end view of the drum), Fig.4 is a diagram of the direction of the components of magnetic forces, Fig.5 is a graphs illustrating the change in the values of magnetic forces in the radial direction with distance from the surface of the drum.

The magnetic separator includes a non-magnetic drum 2 mounted on the shaft 1 and rotatably mounted on the shaft 1, a bath 3, a loading device 4 and an unloading device 5, 6 located inside the yoke drum 7 with a magnetic circuit 8 on which the main permanent magnets 9 of a rectangular shape are fixed and magnets fixed to the surface 9 and made in the form of rectangular prisms of additional magnets 10. The main and additional magnets 9, 10 are made with the same magnetic polarity. The prisms of the additional magnets 10 are made smaller than the main magnets, and are installed in the radial direction with a gap between them. The optimum clearance should be equal to the width of the additional magnets. The main and additional magnets in a direction parallel to the geometric axis of rotation of the drum are placed without a gap, forming continuous parallel strips.

Magnetic separator operates as follows

The initial ore in the form of pulp through the loading device 4 enters the bath 3, where under the influence of the magnetic field of the permanent magnets 9, 10, the magnetic fraction is attracted to the surface of the non-magnetic drum 1 and is partially separated from the non-magnetic fraction. When moving the separated product relative to the magnetic system, additional prismatic magnets create pulsating radial and alternating tangential magnetic forces, leading to the effective destruction of magnetic conglomerates, strands and flocculus.

The weakly magnetic fraction is unloaded under the influence of pulp pressure through the unloading device 5. The magnetic product is unloaded through the device 6.

The interaction of the separated product and the magnetic system is illustrated in Fig.3-5. Figure 3 presents two magnetic blocks mounted on a magnetic circuit 8 and consisting of a main 9 and an additional 10 magnets. On the surface of the rotating drum 2, points A1-A7 are located, near which the magnetic forces were measured using a specially made device acting on 1 gram of magnetic concentrate and showing how many times the magnetic force FM exceeds the gravity force FT (Table 1).

Table 1. No. A1 A2 A3 A4 A5 A6 A7 Fm / Ft, X 0 -twenty 0 +20 0 -twenty 0 Fm / Ft, U +80 +40 0 +40 +80 +30 -twenty

The directions of the components of the magnetic forces correspond to the vector diagram shown in figure 4. Figure 5 presents graphs characterizing the change in the radial component of the magnetic forces when moving away from the surface of the drum R1 and R2 (curve 1 from point A7 and curve 2 from point A5, figure 3). The negative values of the magnetic forces on curve 1 illustrate the repulsion of the magnetic product from the magnetic system.

This technical solution is applicable when working with pulps and with dry materials. Magnets (Nd-Fe-Br) are used for weakly magnetic materials, and boron ferrite magnets are used for strongly magnetic materials. The same magnetic polarity of the magnets provides an increase in the depth of extraction, and the presence of additional magnets - an effective cleaning.

Thus, this technical solution will allow:

- effectively destroy magnetic conglomerates, strands and flocculi;

- provide high selectivity for the separation of separation products.

The source of information

1. Copyright certificate No. 1286288, cl. B03C 1/10, 87.

Claims (1)

A magnetic separator including a non-magnetic drum mounted for rotation, a bath, loading and unloading devices, a magnetic system located inside the drum, made in the form of rectangular permanent magnets mounted on the magnetic circuit, characterized in that it is provided with fixed magnets mounted on the surface and made in the form rectangular prisms with additional magnets, and the main and additional magnets are made with the same magnetic polarity, and the prisms are additional The solid magnets are made smaller than the main magnets and are installed in the radial direction with a gap between them.

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