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Method of the magnetic concentration and the device for the method realization

IPC classes for russian patent Method of the magnetic concentration and the device for the method realization (RU 2288039):

B03C1/24 - with material carried by travelling fields

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FIELD: metal mining industry; methods and devices for magnetic concentration of the finely ground ores.

SUBSTANCE: the invention is pertaining to the field of metal mining industry, in particular, to the magnetic concentration of the finely ground ores containing the strong-magnetic materials and allows to improve the quality of the concentrate. The method provides for the gating of the mash through the working area of the electromagnetic separator with the motionless drum, when the layer of the having flocculated and moving on the working surface particles of the concentrate under action of the traveling magnetic field are exposed to such a mechanical action at which the floccules are destroyed making themselves free from the nonmagnetic fractions, which are flushed away by the water sprays, then the freed thus magnetic particles again are formed in floccules and are withdrawn into the discharge zone. The device includes the body-bath with the conical bottom, the working tool made in the form of the vertical casing-shell with the rotating circular magnet system, which is arranged inside the casing-shell and based on the permanent magnets. On the exterior surface of the casing-shell along its generatrix there are the mounted nets made out of the nonmagnetic material with the mesh size exceeding the maximum size of the grains, but less than the dimension of the floccules along their long axis, and near to the nets the flashing collectors are mounted. For withdrawal of the layer of the floccules of the magnetic fraction the spiral guide is installed.

EFFECT: the invention allows to improve the quality of the concentrate.

2 cl, 5 dwg

Usage: mining industry, the enrichment of the finely ground ore containing selfnominate materials.

The known method and device for its implementation, implemented in the device for mineral mixtures with selfnominate particles, comprising: a vertical, cylindrical housing; concentrically located therein casing installed inside to create a traveling field rotating cylindrical magnetic system; the supply system source of supply and discharge of the products of the separation. To create a downward gradient magnetic forces the casing is made in the form of a truncated, tapered down cone, and between the housing and casing are circular, cone-shaped guides [1].

The disadvantage of this method and apparatus is the low effectiveness of obtaining concentrates of high quality, such as a magnetic concentrate of magnetite iron ore. The coincidence of the direction vectors of competing with the separation of the magnetic force (vertical gradient) and gravity will have a negative effect on the separation process. At lower density, but due to the large size of the aggregates can be hydraulically particle size equal to or greater than the value of this parameter in grains valuable mineral (magnetite). Therefore, in the data the m will be the hit of the poor (tail) fractions in the concentrate.

In addition, the clusters will be captured in the working area of the separator layer of flocs and get into a magnetic fraction and also due to close the magnetic properties of pure concentrate particles and aggregates. In flocculi can be captured and non-magnetic particles as a result of mechanical and adhesive forces.

In this apparatus, in the discharge zone of the magnetic fraction no constructive-technological elements (the gap in the magnetic system, the impact of the jets of wash water etc), allowing you to easily take the concentrate. Therefore, in handling the annular gap at the bottom of the casing will be sticking and accumulation of particles of the magnetic fraction, which will reduce the reliability and efficiency of the device.

The closest analogue (prototype) of the claimed method and device for its implementation is a method implemented in a drum magnetic separator, comprising: a drum with two fixed magnetic systems placed inside of it with a gap relative to each other, the bath, the device for power supply, water and drainage products separation and two vibrator installed on the bottom of the bath. One of the vibrators is installed between the magnetic system and the other under the second course of rotation of the drum magnetic system [2].

The disadvantage of this method and apparatus is what I cannot create a traveling magnetic field of high frequency on the working surface of the drum with a fixed magnetic system due to the limitations of the linear speed of the drum (speed of 1-2 m/s, the frequency of 2-7 Hz). It is known that the frequency of rotation of the magnetic field vector defines the rotation frequency of the magnetic flocs on the working surface and, accordingly, the efficiency of the process of liberation of the magnetic particles from particles of waste rock and aggregates. Thus, low frequency make it difficult to obtain high-quality concentrates, and two vibrators will result in increased energy consumption and a reduction in the overall reliability of the separator.

The aim of the invention is to improve the quality of the concentrate in the operation of magnetic separation when the source power is characterised by a large number rotkovich fractions. This will allow after the first stages of grinding in the traditional technological schemes wet magnetic enrichment to introduce a product with a quality close to the quality of the final concentrate and thereby reduce the processing load on the equipment, to ensure energy saving.

It is known that in a magnetic field separators for enrichment Selfnominated ore particles magnetized mineral localroot with the formation of many individual strands-flocs. Each of flocs represents a set of elongated chains of serially connected through magnetic forces from several to tens or hundreds of particles and oriented with the long axis in space along Sylow the x lines of the magnetic field. The angle between the long axis of flocculi and the working surface of the separator depends on the position of flocculi relative to the poles of the magnetic system.

If the relative motion of the working surface and the magnetic system with alternating polarity in the direction of the motion vector field strength near the surface makes rotation, there occurs the phenomenon of "traveling" magnetic field. Flocculi, focusing along the lines of, also perform a rotational movement around the point of touch with the working surface and thus roll along its long axis along the surface toward the movement of the magnetic system. The frequency of rotation of the field vector and respectively flocs is directly proportional to the linear speed of the magnetic system relative to the surface and inversely proportional step of the poles.

In the formation of flocs in the magnetic field in them, due to the magnetic, mechanical, adhesive forces captured a part of particles with low magnetic susceptibility intergrowths, non-magnetic - waste rock. When moving layer of flocs due to the movement of the working body or traveling magnetic field in the working area of the separator flocculi not fully exempt from pustoporozhnim and rotkovich particles. Hydraulic, centrifugal, vibroacoustics and other competing magnetic forces when beings who, considering how wet magnetic separation is not sufficient for the complete separation of the particles of the concentrate and tailings (middlings). Therefore, the high quality of the concentrate is achieved multiple cleanings with the classification by size.

This objective is achieved in that in the method of magnetic enrichment, including the filing of the original material in the form of a pulp to a working surface with a traveling magnetic field, the separation of material under the action of magnetic, gravitational and hydraulic forces on the magnetic and nonmagnetic fractions and removal of these products, according to the invention the Department captured in flocculi rotkovich and non-magnetic particles from the expanded grains sinnemahoning mineral provided by mechanical destruction of flocs (deflocculation) by passing them through a non-magnetic grid with a cell size of more than the maximum grain enriched material and less than the size of the magnetic flocs along their long axis with subsequent rearrangement and re-flocculation of particles Selfnominated and while rinsing them with water. In the process of destruction of flocs, rearrangements and connections particles in new flocculi mineral content (ferromagnetic mineral in them increases.

The method is implemented in the device-magnetic separator for ore-dressing with selfnominate minerals, including vertically positioned cylindrical body with a conical bottom, concentric with the case to ascertain the hydrated stationary cylindrical casing-shell from rotating inside the closed magnetic system based on permanent magnets with alternating poles in diameter polarity to create a traveling magnetic field, systems power connection and removal products division, according to the invention perpendicular to the direction of movement of the layer sfokusirovalsja material, the generatrix of the cylindrical surface of the housing shell set grid of a nonmagnetic material with a cell size of more than the maximum grain enriched material and less than the size of the magnetic flocs along their long axis, with the supply of wash water to the layer to flush rotkovich and tail fractions, and unloading of the magnetic fraction is carried out by means of the spiral guide, diverting it down in the zone of weakening the action of magnetic forces.

Figure 1-2 shows the working area of the separator with the implementation of the claimed method magnetic ore dressing: magnetic system 1 and the working surface 2, moving flocculi 5,6; grid 3; guide 4.

Figure 3-5 shows the magnetic separator for implementing the method of magnetic ore beneficiation, including magnetic system 1 permanent magnet 4 and the casing-shell 2 located in the housing 3, the nozzles power source 5 and the washing water 6, grid disintegration (disintegration) of flocs 7, the drain chute 8 pipe 9 pipe 10 for release of tailings, the spiral rail 11 and concentrated nozzle 12.

The claimed method is as follows (figure 1). Magnetic particle source is about material, coming in the form of a slurry in a magnetic field, structured with the formation of a variety of flocs. In flocculi, in addition to the particles of the disclosed magnetic mineral, captured particles of aggregates and waste rock. The motion of the poles of the magnetic system 1 with alternating polarity on the working surface 2 creates a traveling magnetic field and the action of the formed flocculi 5 begin to move, rolling over the surface along its long axis toward the movement of the poles. Passing through the installed across the movement of flocs grid 3 with a cell size larger than the maximum grain size and less than the size of flocs along their long axis, they restrukturizuota (destroyed), and the particles concentrate exempt from non-magnetic and weakly magnetic particles, granular fraction that drops down, and slime climb up. Jet wash water intensify the process. After passing through the mesh, treated magnetic particles again are grouped in flocculi, continue to move, and then discharged in an area where there is no field for unloading.

The claimed device is a magnetic separator works as follows (figure 2). Source food in the form of slurry through nozzles 5 (figure 2 supply pipes two) is working on the outer casing surface of the shell 2. Rotating magnetic systems is, the Foundation has permanent magnets 4 alternating polarity (N-S-N-S...), creates the working surface of the traveling magnetic field, characterized by the rotation of the intensity vector at each point of the working surface of the shell. Non-magnetic particles under gravity down to the bottom of the casing and discharged through the pipe 10, and a layer of flocs formed in the magnetic field from the magnetic particle fraction and prityanuvshy to the surface of the casing, begins to move toward the movement of the poles of the magnetic system. Flocculi under the action of the traveling magnetic field passing through the grid 7 with a cell size larger than the maximum size of the grains and the smaller their size along the long axis, decay - restrukturizuota, and a jet of water from the reservoir 6 wash this postepowanie and rostkovia particles that fall down and are discharged through the pipe 10. Slime particles due to the upward flow of water rise up, go in the drain o-ring groove 8 and discharged through a pipe 9. After passing through the grid, purified magnetic particles again are formed in the layer of flocs, which spiral rail 11 is withdrawn from the zone of action of the magnetic field down and are discharged through the concentrated nozzle 12.

Sources of information

1. As the USSR №915967, 03 1/24, 30.03.82.

2. As the USSR №1620143, 03 1/10, 15.01.91.

2. Wet magnetic enrichment of finely ground ore with selfnominate minerals, including enclosure - bath with a conical bottom, a working body, which is a vertical casing-shell with inside a rotating circular magnetic system based on permanent magnets of alternating polarity to create a traveling magnetic field, the system supply source of food,water and conclusion separation products, characterized in that on the outer working surface of the casing of the shell along its generatrix installed grid of a nonmagnetic material with a cell size of more than the maximum grain enriched material and less than the size of the magnetic flocs along their long axis at a distance from the working surface near grids vertically installed flush manifolds, and on the working surface casing-shell - spiral guide, descending in the direction opposite to the direction of rotation of the magnetic system.