Method of magnetic separation and device to this end

FIELD: process engineering.

SUBSTANCE: invention relates to magnetic property separation of materials and may be used for extraction of highly magnetised materials from placer concentrates to be used in mining and lab conditions. Proposed method comprises forcing initial material through magnetic separator with cylindrical work surface with horizontal axis and variable, travelling, magnetic field, displacing flocculated magnetic particles by revolving drum and travelling magnetic field, separating material particles by magnetic forces, adhesion, friction as well as gravity and centrifugal forces into magnetic and nonmagnetic fractions, and discharging separation products. Magnetic fraction is subjected to continuous intensive cleaner flotation in forcing flocculated material along closed circular path over drum surface to separate joints and draw rock particles trapped in magnetic floccules, and periodic discharge of magnetic fraction after eliminating retaining magnetic field.

EFFECT: higher efficiency of magnetic separation and cleaning of highly magnetised impurities.

2 cl, 4 dwg

 

The invention relates to processes and devices for the separation of materials for magnetic properties and can be used for separation of particles Selfnominated minerals from placer concentrates (slatestone operations), exploration and laboratory practice.

The known method and device for its implementation, implemented in the separator for the separation of mineral raw materials for magnetic properties, comprising a cylindrical magnetic system of permanent magnets that create a traveling magnetic field, a stationary drum which are located on the outer side of the magnetic system, feeder, receivers product separation [1]. Shell in the zone of separation concentric magnetic system, and in the discharge zone of the magnetic fraction is tangent.

The disadvantage of this method and apparatus is the inability to obtain concentrates of high quality. The absence of competing with the magnetic forces of the centrifugal forces due to the immobility of the shell will cause the ingress of non-magnetic and poor rotkovich particles in magnetic product and thereby reduce its quality.

The closest analogue (prototype) of the proposed method and device for its implementation is a method implemented in a drum magnetic separator (design Laurilla), including: horizontal R is sporogony drum with a closed (circular) magnetic system, device for the upper feed enriched material, the magnetic induction magnetic puller product, devices for supply and exhaust of the products of separation [2]. Counter rotation of the shell of the drum and the magnetic system provides centrifugal mode magnetic enrichment in the high-frequency AC (running) magnetic field.

Lack of data and method of the separator is low efficiency in obtaining concentrates of high quality when the source material is characterized by a large content of small rotkovich fractions. Limited the total time spent enriching material on the drum surface (tenths of a second), caused by high speed rotation of the shell and the limited road passable material from the point of submitting it to the drum to the point of discharge (less than 360°) will not allow you to completely clear flakoll magnetic fraction from the fine aggregates and pustoporozhnim particles. The efficiency of magnetic induction stripper concentrate (brush) in the presence of moisture in the material is reduced.

The aim of the invention is the provision of magnetic concentrates with high quality original power supply, with a high content rotkovich fractions, as well as the achievement of highly purified mineral mixtures from sinnemahoning impurities.

Famous is, in a magnetic field separators magnetic particles (ferromagnetic) minerals localroot with the formation of many individual strands-flocs. Each of the flocs is a set of chains elongated sequentially connected via magnetic forces of the particles and oriented with the long axis in space along the magnetic field lines. The angle between the long axis of flocculi and the working surface of the separator depends on the mutual position of flocculi and poles of the magnetic system.

If the relative motion of the surface of the working body and the magnetic system with alternating polarity in the direction of the motion vector of the magnetic field near the surface makes rotation, there occurs the phenomenon of traveling magnetic fields. Flocculi, focusing along the lines of, also make freestylee 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 poles of the magnetic system. The frequency of rotation of the field vector and respectively flocs is directly proportional to the linear velocity of the relative movement of the magnetic system and the working surface and is inversely proportional step of the poles.

In the formation of flocs in magnetic field due to the magnetic forces, friction forces, adhesive forces is ohvatyvayutsya part of particles with low magnetic susceptibility - splices and non-magnetic - waste rock. In existing methods of magnetic separation of forces, gravitational, centrifugal, vibroacoustics and competing with holding forces are not sufficient for complete efficient separation of the particles of the concentrate and tailings (middlings). When moving layer of flocs due to the movement of the working body and the running of the magnetic field in the working area of the separator flocculi not fully exempt from pustoporozhnim and rotkovich particles. Therefore, the high quality of the concentrate or the degree of purification is provided by multiple cleanings with the classification by size.

In the existing drum separators, including taken as a prototype, faculy before unloading in concentrated Bay collection products separation only once be optimal for the separation of particles on the magnetic properties of the lower portion of the surface of the drum. In this area the attractive force of the magnetic field acts in the direction opposite to the action of centrifugal and gravitational forces. Time passing by faculae this plot is hundredths of seconds. As is known, the process of magnetic separation due to the complicated interaction of different origin of the forces acting on the set of particles with different physical properties, has substantially Eratosthenes, statistical in nature. Therefore, the probability of effective separation of particles on the magnetic properties in a single pass of flocs working area of the separator is less than 360°, with a limited time is not large enough.

This goal is achieved in the invention by the fact that in the method of magnetic enrichment (clean) dispersed mineral mixtures with selfnominate minerals, including the filing of the original material on the cylindrical working surface of the separator with a traveling magnetic field, the separation of material under the action of magnetic, gravitational, centrifugal forces on the magnetic and nonmagnetic fractions and removal of these products, the Department captured in flocculi rotkovich and non-magnetic particles from the expanded grains sinnemahoning mineral is provided by multiple passage sfokusirovalsja material in a closed circular path on the surface of the drum, and periodic unloading of the magnetic fraction is carried out after the termination of retaining its magnetic field on the entire surface the working side of the drum.

The method is implemented in the device - drum magnetic separator for separation of particles Selfnominated minerals from mineral mixtures, comprising a horizontally positioned drum with a rotating counter ring and the inner circular m is Gnanou system permanent magnet, with poles of alternating polarity supply systems supply and exhaust products division, which according to the invention the magnetic system is made along the length less than half the length of the drum, the shaft of the magnetic system and two based on the frame bearing Assembly is configured to move the magnet along the axis inside the drum axial movement of the shaft, and the outer surface of the shell is divided into two equal parts along the length of the flange-flange. The collection of products includes two compartments for nonmagnetic and magnetic fractions and can be moved perpendicular to the axis of the drum. To regulate the magnetic field on the working surface by changing the distance from this surface to the magnetic system on the sides of the drum are mounted removable sheets of flexible non-magnetic material different column.

Figure 1 shows the working surface of the drum separator 1 with the implementation of the method of magnetic separation, circular magnetic system 2, the trajectory of a layer of flocs, unloading non-magnetic fraction.

Figure 2 shows the lower part of the drum with a magnetic faculae and distribution of forces acting on the particle flocculi located at the lowest point of the drum surface.

Figure 3 shows the process of unloading the magnetic fraction after termination of the magnetic on the I on the surface of the drum.

Depicted in figure 4, a magnetic separator for implementation of the proposed method magnetic enrichment, includes: drum, consisting of a circular magnetic system of permanent magnets of alternating polarity 1, a cylindrical shell 2, flange-flange 3, which divides the surface of the shell into two parts, the shaft 4, the bearing assemblies 5 and lid 6, and the supply duct 7, case 8, the compartments of the collection of the products of separation of the tail 9 and concentrated 10, a removable cylindrical non-magnetic elements 11.

The inventive method is carried out as follows (figure 1). The magnetic particles of the source material from above the drum, fall within the zone of action of the magnetic field and is structured with the formation of a variety of flocs. In flocculi in addition to the particles of the disclosed magnetic minerals can be captured particles of aggregates and waste rock. The formed layer of flocs is moved from the sides of the drum in a traveling magnetic field in a circular motion. The velocity of flocs formed from the linear velocity of the shell of the drum and the speed of rolling them along their long axis toward the movement of the poles, i.e. by exposure to a traveling magnetic field. In the process of movement of the layer of flocs they are under the influence of centrifugal and gravitational forces are released from particles of aggregates and waste rock that ass is up in the rear compartment of a collection of products.

The best conditions for separation of rich ferromagnetic particles of the mineral and the poor (weakly or non-magnetic) particles will be at the lowest point of the drum surface (figure 2). Here the strength of the magnetic attraction FMand the main competing forces: gravitational Fgcentrifugal rotation of the drum FCBcentrifugal rotation (rolling) around point touch flocculi FCBwill act on the same vertical line, in opposite directions. The group of neighboring flocs disclosed by the fan, which promotes the release of them and of the gaps between non-magnetic and weakly magnetic particles. This situation is only for those flocs, which are near the lowest point, when the axis of one of the poles coincides with the vertical. After the pole is offset from the vertical, the conditions for separation become less favorable. When opposite the lowest point of the drum is the interpolar gap, faculy lie down on the drum and the effect of competing forces is to separate the particles are less efficient.

In the inventive method, the layer sfokusirovatjsya particles of magnetic mineral (material) repeatedly turns on the surface of the drum around its axis as it emanates from the tail fractions. The likelihood of effective section is of significantly enhanced by repeated passage of floculate the low point of the drum surface. Thus, the length of the zone of separation and time separation in this way can in fact be arbitrarily large.

Upon reaching the desired degree of purification of the magnetic flocs, i.e. after completion of phase magnetic separation for removal (discharge) of the magnetic fraction in the concentrated compartment of the collection of the products of the separation, retaining the magnetic field ceases to exist on the entire working surface of the drum (figure 3).

The proposed device is a magnetic separator works as follows (figure 4). The source material in the form of portions of a certain volume is fed through the hopper 7 on top of the horizontal cylindrical surface of the drum located in the housing 8. The magnetic system is in the direction of the horizontal axis of the drum is less than half of its total length (figure 4, section a-a), and the surface of the drum shell 2 is divided into two equal half - working and nonworking flange-the flange 3. Rotating opposite sides of the drum 2 and the circular magnetic system 1 on the basis of permanent magnets of alternating polarity (N-S-N-S...) create a traveling magnetic field, characterized by the rotation of the magnetic induction vector at each point of the working surface.

Layer sfokusirovalsja material begins to move on the surface of the drum in a circular closed path. In the de the effects on particle flocs forces - magnetic, adhesive, friction and opposing them mechanical - gravitational, centrifugal separates captured in flocculi or caught in the gap between the non-magnetic and weakly magnetic particles, which are discharged in the rear compartment sink products of separation 9. Flocculi forming layer, moving along a closed circular path, repeatedly pass through the lower portion of the drum surface, where the conditions for their removal from the tail fractions optimal. With each rotation, the mass fraction of magnetic mineral in the layer increases.

After completion of the process of magnetic separation of particles of a portion of the material the shell of the drum and the magnetic system are stopped, the drum is moved and concentrated Bay collection products separation unit 10 and the shaft 4 together with the magnetic system is moved inside the drum along its axis from position "I" under the working part of the drum in position "II" under the outside part. The shaft slides in the sleeve bearing 5. Flange the flange 3 restricts the movement of the magnetic product after magnetic system on the outside part of the drum.

After moving the magnetic system in position "II" on the surface of the drum magnetic field will not be magnetic product will freely discharge into a concentrated compartment SB is mica products.

Before separation the next portion of the magnetic material, the system is switched to position "I", under the drum is fed to the tail section of the collection of the products of the separation are given in the counter-rotation of the magnet and the shell and the cycle repeats.

When the selective allocation of narrow classes of particles of ferromagnetic minerals of different grain size and magnetic properties, it is necessary to adjust the magnitude of the magnetic induction on the surface of the drum. For this purpose, the surface of the shell of the working part of the drum is covered with a removable cylindrical elements of different thickness 11 of non-magnetic material. The value of the distance from the surface of the magnets to the work surface of the drum in the radial direction determines the magnitude of the magnetic induction and, accordingly, the magnetic force of attraction.

Sources of information

1. As the USSR №845855, VC 1/10, 25.07.81.

2. Plaksin, I. N., Karmazin VI, Ropinski V.F., Norkin CC, Karmazin V. New directions deep enrichment finely disseminated iron ore. - M.: Nauka, 1964.

1. The method of magnetic separation of fine mineral mixtures containing magnetic minerals, including transmission of the separated material through the working area of the magnetic separator with a cylindrical working surface with a horizontal axis and a variable - bemusement field moving sfokusirovatjsya magnetic particles due to the rotation of the drum and actions of the traveling magnetic field, the separation of material under the action of magnetic forces, adhesion, friction and competing with them by gravitational and centrifugal forces on the magnetic and nonmagnetic fractions and unloading of product separation, characterized in that provide intensive long-cleaners magnetic fraction due to repeated passage sfokusirovalsja material in a closed circular path on the surface of the drum with the Department rotkovich and pustoporozhnim particles trapped in the magnetic flocculi, and periodic unloading of the magnetic fraction after termination of retaining its magnetic field on the working surface of the drum.

2. A device for magnetic separation of fine mineral mixtures, comprising a horizontally positioned working body drum with internal circular closed magnetic system of permanent magnets of alternating polarity to create a traveling magnetic field in the opposite rotation of the shell and the magnetic system, devices for feeding the source material and the collection separation products, characterized in that the magnetic system is made along the length less than half the length of the drum, the shaft of the magnetic system and two of the bearing unit are madewith the possibility of axial movement of the magnetic system inside the drum, the outer surface of the shell is divided into two equal length parts: the working and nonworking flange-flange, and a collection of products includes two bays for nonmagnetic and magnetic fractions and can move perpendicular to the axis of the drum.

3. The device according to claim 2, characterized in that for changing the spacing between the surface of the magnetic system and the working surface of the drum with a replaceable cylindrical elements of different thickness.



 

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