RU1793971C - Magnetic separator - Google Patents

Abstract

Use: for enrichment of ferromagnetic materials. SUMMARY OF THE INVENTION: Inside the rotating drum 1, a magnetic system 2 is located, consisting of blocks of permanent magnets 4 mounted on the frame 3 and connected in series. The blocks of magnets in the row are made with the same directivity of the same poles, and between the rows with alternating. The rows are made with a step equal to 0.6-0.8 of the width of the block of permanent magnets 4. The geometric axes of the same and opposite poles are displaced, and the displacement of the opposite poles is 0.1-6.2 of the length of the block of permanent magnets 4. 3 ill., 1 tablet; & Yo

Description

FIG. g

The invention relates to mineral processing, and in particular to the design of magnetic separators for the enrichment of ferromagnetic materials.

A magnetic separator is known which comprises permanent magnets that are rigidly fixed in rows on the frame with an interpolar pitch between the rows. The geometric axis of the poles in the known magnetic system are symmetrical 1.

This device does not have a high enough quality magnetic product due to the low degree of release of magnetic particles trapped in the flocs when the material moves in a magnetic field parallel to the transverse axes of the magnet blocks.

The prototype is a magnetic separator including a rotating drum and a magnetic system located inside it, consisting of blocks of permanent magnets connected in series with alternating polarity of the poles both in the row and between the rows. Blocks of permanent magnets are made without a pole gap and with a displacement of the geometric axes of the same poles 2.

The prototype has the same drawback due to the small amplitude of magnetization reversal - a magnetic flocculus, which impairs the release of non-magnetic particles, and high losses of iron with tails due to insufficient depth of the magnetic field,

The purpose of the invention is to improve the quality of the magnetic product and reduce the mass fraction of iron in the tails.

This goal is achieved by the fact that in the known device, including a rotating drum, a stationary magnetic system located inside it, consisting of permanent magnets mounted on a frame and connected in series with the same directivity of the same polarities in series and alternating between in the series made with the displacement of the geometric axes of the opposite and opposite poles, the displacement of the geometric axes of the opposite poles is 0.1-0.2 lengths of the block of permanent magnets, and the series of constant bends are made in increments equal to 0.6--0.8 of the width of the block of permanent magnets.

The execution of a series of blocks of permanent magnets with a step and with simultaneous displacement of the geometrical axes of the opposite poles can improve the quality of the magnetic product and reduce the loss of iron in the tails due to the long path of the magnetic product along a complex path from the centers of the poles of one row

to another and larger amplitude of magnetization reversal of the magnetic flocculus strands due to the intense release of non-magnetic particles from the flocculus.

The step between the rows of magnets less than 0.6 of the width of the block of permanent magnets reduces the mass fraction of iron in the tails, because the depth of the floor is insufficient to hold the magnetic strands on the surface of the drum.

When performing a step of more than 0.8, the magnitude of the magnetic field is large, which leads to mechanical capture of the non-magnetic fraction by the magnetic product.

Performing a displacement of the geometrical axes of less than 0.1 reduces the quality of the magnetic product due to the amplitude of movement of the magnetic strands, which is not enough to completely release the magnetic particles.

Performing a displacement of more than 0.2 block length increases the loss of iron with tails, as the amplitude, on the contrary, is large, and magnetic particles cannot be held on the surface of the drum and go into tails.

In FIG. 1 shows a General view of the proposed device; in FIG. 2 - common pid of the magnetic system of the separator; in FIG. 3 shows the trajectories of magnetic particles in the proposed separator.

The device includes a rotating drum 1, a stationary magnetic system 2 located inside it, consisting of blocks of 4 permanent magnets 4 fixed on the frame 3 with a length of -I and a width a with the same directivity of the same polarities in the row and alternating directivity of the same polarities between p ladies. The magnet blocks are made with a displacement of the geometric axes of the opposite and opposite poles, while the displacement of the geometric axes of the opposite poles is 1-0.2 of the length I of the block of 4 permanent magnets. Blocks 4 are made with a step S equal to 0.6-0.8 of the width of the block a. The geometrical axes of blocks of magnets of opposite poles are offset relative to each other by a value of D equal to 0.1-0.2 of the length of a block of 4 permanent magnets.

The separator can be used for both dry and wet magnetic separation.

The device operates as follows.

The feed ore is fed to the rotating drum 1. The magnetic product is attracted to the drum. As the ore moves along the drum, due to the selected optimal ratio of the pitch between the poles and the displacement of the geometric axes of the opposite poles, the material undergoes active agitation about the magnetic field with a complex trajectory of movement (Fig. 3). Exit from the magnetic field, the concentrate enters the collector. Non-magnetic product also enters the appropriate collection (not shown in the drawing).

The device has been tested in laboratory conditions on magnetite ore Sokolovsko

Sarbaiskoye deposit with an initial grain size of 25.0 mm. The iron content in the starting product is 34.5%.

For experiments, a laboratory drum magnetic separator with a capacity of 500 kg / c was used. The magnetic field strength was 0.14 T, the width of the permanent magnet block was 88 mm, the length 135 mm,

The test results of the proposed and known devices are shown in the table.

Claims (1)

The claims A magnetic separator containing a rotating drum and a stationary magnetic system located inside it, consisting of blocks of permanent magnets fixed on the frame and connected by D rows with the same directivity of the same polarities in the row and alternating between rows made with a displacement of the geometric axes of the same and opposite poles, characterized in that, in order to increase the efficiency of the magnetic separator by improving the quality of the magnetic product and reducing the mass fraction of iron in the tail x, the displacement of the geometrical axes of the opposite poles is 0.1-0.2 of the length of the permanent magnet block, and the rows of permanent magnets are made in increments of 0.6-0.8 of the width of the permanent magnet block. XVosta I Mffk // i // r mtif x rodunt Figure 1