Self-gravity dry magnetic separation table and its application in separation of magnetic minerals

Abstract

The application discloses a self-gravity dry-type magnetic separation shaking table and application thereof in separation of magnetic mineral, and belongs to the technical field of mineral separation. The shaking table comprises a shaking table bed surface; tailing receiving hoppers and concentrate receiving hoppers are sequentially arranged below the shaking table bed surface; a concentrate baffle is arranged on the lower surface of the shaking table bed surface and close to the concentrate receiving hopper; the concentrate baffle is fixedly connected with the bottom of the shaking table bed surface; a magnetic field generating device is arranged above the shaking table bed surface and is arranged on a magnetic force device support frame; the movement area of the magnetic field generating device is above the bed surface; the shaking table bed surface is relatively static, and the magnetic field generating device relatively reciprocates and integrally moves forward. The application combines the magnetic separation with the gravity separation, strengthens the dry separation of the magnetic material and the non-magnetic material, solves the problem of water shortage in the western region and even in the desert region, and obtains the concentrate product with primary properties.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral processing, and particularly relates to a self-gravity dry-type magnetic separation shaking table and application thereof in separation of materials containing magnetic minerals. BACKGROUND

[0002] Various minerals in the crust are closely associated and form a dense aggregate, or smelting slag, solid waste contains various materials with different properties. Since the uses of various minerals / materials are different, it is necessary to separate different minerals in ores or different materials in smelting slag and solid waste by beneficiation methods. Gravity separation, magnetic separation and flotation are the most common beneficiation separation methods, which separate the target minerals by using the differences in density, magnetism and surface wettability. However, for special separation conditions, the above separation methods are not very suitable. For example, the flotation method and the traditional wet magnetic separation method consume a large amount of water and pollute water quality, which limits the application of the above two methods in the western and even desert regions. For another example, in the preparation of high-purity nickel pyrite in the laboratory, the natural nickel pyrite has low purity, and a large amount of chalcopyrite and pyrrhotite exists in the ore, so it is necessary to separate the nickel pyrite from chalcopyrite and pyrrhotite. The traditional flotation method can separate chalcopyrite and even pyrrhotite, but the flotation method is carried out in water medium, and the nickel pyrite is easily oxidized and dissolved when it comes into contact with water, which changes its original surface properties. In addition, the residual flotation reagents also affect the surface properties of the nickel pyrite, which ultimately leads to the difficulty in meeting the application performance requirements of the purified nickel pyrite.

[0003] Magnetic separation is a feasible way to remove pyrrhotite or chalcopyrite, but wet magnetic separation also faces the problems encountered by flotation. In the dry magnetic separation process, especially in the process of using a magnetic drum, the material layer is thick and relatively static with the drum surface, which makes it difficult to solve the problem of magnetic separation entrainment, so that part of the non-magnetic material enters the magnetic separation concentrate, which ultimately affects the concentrate grade. Therefore, the existing beneficiation technology cannot meet the special beneficiation technology requirements.

[0004] Therefore, it is necessary to design a self-gravity dry-type magnetic separation shaking table to solve the above technical problems by using a magnetic-gravity combined separation process. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a self-gravity dry-type magnetic separation shaking table and its application in separation of materials containing magnetic minerals, which combines magnetic separation with gravity separation, strengthens the dry separation of magnetic materials and non-magnetic materials, solves the problem of water shortage in the western and even desert regions, and obtains concentrate products with original properties.

[0006] In order to achieve the above purpose, the present application provides the following technical solutions:

[0007] The application provides a self-gravity dry-type magnetic separation shaking table, which comprises a shaking table bed surface;

[0008] A tailing receiving hopper and a concentrate receiving hopper are sequentially arranged below the shaking table bed surface, and a concentrate baffle is arranged on the lower surface of the shaking table bed surface close to the concentrate receiving hopper and fixedly connected to the bottom of the shaking table bed surface.

[0009] A magnetic field generating device is arranged above the shaking table bed surface, the magnetic field generating device is arranged on a magnetic force device support frame, and the area above the bed surface is a magnetic field generating device movement area; the shaking table bed surface is relatively static, and the magnetic field generating device moves reciprocally but as a whole moves forward.

[0010] As a further improvement of the above scheme, the lower surface of the shaking table bed surface is a self-gravity magnetic-gravity separation area.

[0011] The lower surface of the shaking table bed surface is provided with bed strips of different heights and parallel installation, and the movement direction of the magnetic field generating device is perpendicular to the installation direction of the bed strips.

[0012] In the feeding area, the height of the bed strips is small; in the concentrate area, the height of the bed strips is large, and the height of the bed strips gradually increases from small to large.

[0013] As a further improvement of the above scheme, the shaking table bed surface has an included angle θ with the horizontal direction, and 0° < θ < 30°.

[0014] As a further improvement of the above scheme, the shaking table bed surface is supported by a plurality of supports.

[0015] As a further improvement of the above scheme, one side of the support is provided with a movable feeder.

[0016] As a further improvement of the above scheme, the movable feeder is provided with a feeding hopper, the feeding hopper is movable and rotatable to set an inclination angle, and the feeding hopper is convenient for conveying the mineral raw materials to the feeding area below the shaking table bed surface.

[0017] As a further improvement of the above scheme, a middling receiving hopper is arranged between the tailing receiving hopper and the concentrate receiving hopper.

[0018] As a further improvement of the above scheme, the magnetic field generating device is a permanent magnet or an electromagnet, the magnetic field strength can be adjusted, and the requirements from weak magnetism to strong magnetism can be met.

[0019] As a further improvement of the above scheme, a sliding rail is arranged on the magnetic force device support frame, and the magnetic field generating device can reciprocally move along the sliding rail.

[0020] As a further improvement of the above scheme, a driving device is arranged on the side surface of the shaking table bed surface, and the driving device is in transmission connection with the magnetic field generating device.

[0021] As a further improvement of the above scheme, the lower surface of the table bed is close to the tailings baffle on the side of the tailings receiving hopper.

[0022] The application also provides the application of the self-gravity dry magnetic separation table in the separation of magnetic minerals, including:

[0023] (1) transferring the mixture of magnetic minerals and non-magnetic minerals to the feeding hopper of the mobile feeder, moving the feeding hopper to the feeding area of the table bed and parallel to the table bed;

[0024] (2) the initial position of the magnetic field generating device above the table bed is above the feeding area, which generates a local magnetic field and adsorbs the materials in the feeding hopper below the table bed on the table bed;

[0025] (3) the magnetic field generating device moves along the slide rail from the feeding area to the concentrate area, and the movement feature is forward and backward reciprocating motion, but the forward stroke is greater than the backward stroke, so the whole moves forward (asymmetric stroke), and the magnetic field of the table bed changes during the movement of the magnetic field generating device relative to the table bed, and the magnetic minerals move with the movement of the magnetic field generating device, while the non-magnetic minerals directly fall into the tailings receiving hopper due to the action of gravity;

[0026] (4) during the movement of the magnetic materials with the magnetic field generating device, part of the non-magnetic materials will be entrained in the bed layer, and the action of the bed strip is to form protrusions and depressions on the table bed, to cause the materials to "roll" during the movement and release the non-magnetic materials in the bottom layer of the materials (close to the table bed), and the non-magnetic materials will fall off from the table bed under the action of gravity, thereby achieving the purpose of gradually separating the magnetic materials from the non-magnetic materials;

[0027] (5) the magnetic materials are finally accumulated at the concentrate baffle, while the magnetic field generating device continues to move forward and gradually moves away from the concentrate baffle, and at the same time, the magnetic field strength of the concentrate baffle gradually weakens, and the magnetic minerals fall into the concentrate receiving hopper under the action of gravity.

[0028] In a specific embodiment, the inclination angle between the table bed and the horizontal plane is θ, which increases the rolling degree of the materials during the rising process under the action of gravity, and is beneficial to further strengthen the separation of non-magnetic materials and prevent the premature falling of magnetic materials, thereby ensuring the recovery rate of magnetic materials.

[0029] In a specific embodiment, the magnetic field strength of the magnetic field generating device is a key factor to determine the separation index, and a smaller magnetic field strength can be used for separating strong magnetic minerals such as magnetite or pyrrhotite, while a higher magnetic field strength is required for separating weak magnetic minerals such as hematite or chalcopyrite.

[0030] In a specific embodiment, the asymmetric stroke motion feature of the magnetic field generating device is another key factor determining the separation index. The greater the stroke frequency, the faster the motion speed of the magnetic field generating device, which determines the faster motion speed of the material on the table surface, the more violent the collision and the jumping over the bars, the more easily the non-magnetic or weakly magnetic material falls off as tailings, and only the strongly magnetic mineral particles can be adsorbed on the table surface all the time, eventually becoming high-grade concentrate products. In addition, under the condition of high stroke frequency, the relative speed difference between the magnetic field generating device and the material will be larger, which will lead to a larger distance between the material layer and the magnetic field generating device, and the magnetic force on the material will decrease, which will also promote the falling of non-magnetic and weakly magnetic materials. In addition, the greater the forward stroke of the magnetic field generating device and the smaller the backward stroke, the faster the overall forward trend of the magnetic field generating device and the material, and the shorter the separation time on the table surface, which makes it easier to bring weakly magnetic and moderately magnetic particles into the concentrate product, which is beneficial to ensure the recovery rate of magnetic separation.

[0031] In a specific embodiment, the magnetic field generating device is a replaceable permanent magnet or an electromagnetic coil with adjustable current (electromagnet).

[0032] In a specific embodiment, when the bar height is high, the rolling phenomenon of the material layer jumping over the bar is more significant, and when the bar height is low, the rolling phenomenon is weaker.

[0033] In a specific embodiment, the distribution of the bars as a whole gradually increases the concentrate grade according to the principle of from low to high. The height of the bars on the table surface is adjusted according to the mineral raw material and the beneficiation parameters.

[0034] In a specific embodiment, the stroke and the stroke frequency of the asymmetric stroke motion of the magnetic field generating device are adjusted according to the mineral raw material and the beneficiation parameters.

[0035] In a specific embodiment, the stroke of the asymmetric stroke motion of the magnetic field generating device is 1-15 cm / s, the stroke frequency is 1-20 c / min, and the magnetic field strength is 0.1-1.0 T.

[0036] In a specific embodiment, the height of the bars on the table surface is adjustable, ranging from 0.5 mm to 20 mm.

[0037] The application discloses a self-gravity dry-type magnetic separation shaking table, which is used for strengthening the separation effect of dry-type magnetic separation, overcoming the dependence of a mineral processing technology in the west and other water-deficient areas on water, and realizing water-free mineral processing in special mineral processing conditions such as high-purity nickel pyrite preparation, and further obtaining material products with high quality and original surface properties, so as to realize comprehensive and efficient development and utilization of resources. The device fully utilizes the difference in magnetism of different materials, replaces the role of washing water in a traditional water medium shaking table with a gravity field, and realizes the separation of magnetic materials and non-magnetic materials. Meanwhile, a convex bed strip is used to replace the traditional grooves of the shaking table, so that the rolling of the material layer is realized, and then the non-magnetic materials mixed in the material layer are gradually exposed and separated; the asymmetric stroke movement of a magnetic field generating device is controlled, the stroke and stroke frequency characteristics are adjusted, and the separation is regulated; the magnetic field strength of the magnetic field generating device is adjusted, the relative size of the magnetic attraction and the gravity suffered by the magnetic materials is adjusted, and then the separation effect is adjusted.

[0038] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0039] (1) In the traditional water medium shaking table, the upward surface of the shaking table is the working surface, and the washing water is used to give the material a horizontal movement force on the shaking table surface, and grooves are arranged on the shaking table surface to realize the rolling of the material, so as to loosen the material, reduce the entrainment, realize the separation of magnetic materials and non-magnetic materials. In the application, the downward surface of the shaking table is the working surface, and the composite force field composed of magnetic force and gravity is used to realize the separation of magnetic materials and non-magnetic materials, and then the water medium is cancelled, and dry separation is realized. The upward magnetic force suffered by the magnetic material is greater than the downward gravity, and the magnetic material is still adsorbed on the shaking table surface, and then becomes a concentrate product, while the upward magnetic force suffered by the non-magnetic material is less than the downward gravity, and the non-magnetic material will be separated from the shaking table surface and fall to become a tailing product.

[0040] (2) Compared with the traditional dry-type magnetic separation, in the self-gravity dry-type magnetic separation shaking table, the magnetic field generating device will make asymmetric stroke movement, and the material will make reciprocating movement on the shaking table surface provided with bed strips with different heights, and collide with and roll over the shaking table surface, so as to realize the exposure of the magnetic material mixed in the material layer, and the magnetic material is rapidly separated from the separation shaking table surface under the action of gravity, and then the separation precision is improved.

[0041] (3) Since there is no water medium and no chemical agent, when the self-gravity dry-type magnetic separation shaking table is used for separating special materials, the original surface properties of the materials can be maintained, and qualified products with high quality and original surface properties can be obtained.

[0042] (4) The self-gravity dry-type magnetic separation shaking table can fully utilize the composite force field composed of the magnetic field and the gravity field, and strengthen the separation efficiency of the magnetic materials and the non-magnetic materials. BRIEF DESCRIPTION OF DRAWINGS

[0043] Fig. 1 is a front view of the self-gravity dry magnetic separation shaker.

[0044] Fig. 2 is a schematic diagram of the whole self-gravity dry magnetic separation shaker.

[0045] Fig. 3 is a schematic diagram of the inclination angle between the shaker bed surface and the horizontal plane.

[0046] Wherein, 1-shaker bed surface; 101-feeding area; 102-concentrate area; 2-tailings baffle; 3-tailings receiving hopper; 4-intermediate product hopper; 5-concentrate receiving hopper; 6-concentrate baffle; 7-magnetic field generating device; 8-magnetic device support frame; 9-slideway; 10-bed strip; 11-support; 12-mobile feeder (not shown); 1201-feeding hopper; 13-driving device. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0048] In the treatment of iron-nickel co-associated ore containing pyrrhotite or other magnetic-nonmagnetic mixed materials, flotation or wet magnetic separation is usually selected for high-precision separation. However, in arid regions, water resources are particularly precious, and the demand for dry separation is particularly prominent. Due to the lack of water as a dispersion and separation medium, the traditional dry magnetic separation has particularly significant agglomeration and inclusion, resulting in much lower separation precision and separation efficiency than wet magnetic separation. In addition, in some cases, the addition of water or chemical reagents will change the original surface properties of the material, affecting the subsequent properties and applications of the material. Overall, there is still a great demand and great market potential for dry high-precision separation in the field of material separation.

[0049] The present application realizes the separation of magnetic / nonmagnetic materials by using a composite force field of magnetic field and gravity field, and through the asymmetric stroke movement of the magnetic field generating device and the special design of the height of the shaker bed surface bed strip, the material layer is rolled and moved, and the entrained nonmagnetic materials are exposed to strengthen the separation. Finally, the magnetic materials and nonmagnetic materials can be efficiently separated under waterless conditions and maintain good original surface properties.

[0050] Reference is made to the accompanying drawings Figs. 1-3 , a self-gravity dry magnetic separation shaker, comprising a shaker bed surface 1;

[0051] Below the shaking table surface 1, there are tailings receiving funnel 3 and concentrate receiving funnel 5 in sequence. On the lower surface of the shaking table surface 1, near the concentrate receiving funnel 5, there is a concentrate baffle 6. The concentrate baffle 6 is fixedly connected to the bottom of the shaking table surface 1.

[0052] A magnetic field generating device 7 is provided above the shaking table surface 1. The magnetic field generating device 7 is mounted on the magnetic device support frame 8. The area above the table surface is the moving area of ​​the magnetic field generating device. The shaking table surface 1 is relatively stationary, while the magnetic field generating device 7 moves back and forth but forward as a whole.

[0053] In a preferred embodiment, the area below the shaking table surface 1 is a gravity-magnetic-weight separation region;

[0054] The lower surface of the rocking table is provided with bed strips 10 of different heights and installed in parallel. The direction of movement of the magnetic field generating device 7 is perpendicular to the installation direction of the bed strips 10.

[0055] In the feeding zone 101, the height of the bed bars 10 is relatively small; in the concentrate zone 102, the height of the bed bars 10 is relatively large, with the height of the bed bars gradually increasing from small to large.

[0056] In a preferred embodiment, the shaking table surface 1 forms an angle θ with the horizontal direction, where 0° < θ < 30°.

[0057] In a preferred embodiment, the shaking table surface 1 is supported by a plurality of supports 11.

[0058] In a preferred embodiment, a mobile feeder 12 is provided on one side of the support 5.

[0059] In a preferred embodiment, the mobile feeder 12 is provided with a feed hopper 1201, which can be moved and rotated at a set angle to facilitate the transfer of mineral raw materials to the feeding area 101 below the shaking table.

[0060] In a preferred embodiment, a middlings receiving funnel 4 is provided between the tailings receiving funnel 3 and the concentrate receiving funnel 5.

[0061] In a preferred embodiment, the magnetic field generating device 7 is a permanent magnet or an electromagnet, and the magnetic field strength can be adjusted to meet the requirements of weak to strong magnetic fields.

[0062] In a preferred embodiment, the magnetic device support frame 8 is provided with a slide rail 9, and the magnetic field generating device 7 can reciprocate along the slide rail 9.

[0063] In a preferred embodiment, a drive device 13 is provided on the side of the shaking table surface 1, and the drive device 13 is connected to the magnetic field generating device 7 for transmission.

[0064] The application of the gravity-driven dry magnetic separation shaking table described in this application in the separation of magnetic minerals includes:

[0065] (1) Transfer the mixture of magnetic and non-magnetic minerals to the feed hopper of the mobile feeder, and move the feed hopper to the feeding area of ​​the shaking table and make it parallel and close to the shaking table surface;

[0066] (2) The initial position of the magnetic field generating device above the shaking table is above the feeding area. It will generate a local magnetic field and adsorb the material below the shaking table and in the feeding hopper onto the shaking table.

[0067] (3) The magnetic field generating device moves along the slide rail from the feeding area to the concentrate area. Its movement is characterized by back-and-forth reciprocating motion, but the forward stroke is greater than the backward stroke, so the whole moves forward (asymmetric stroke). During the movement of the magnetic field generating device relative to the shaking table surface, the magnetic field of the shaking table surface changes. Magnetic minerals will move with the movement of the magnetic field generating device, while non-magnetic minerals will fall directly into the tailings receiving funnel due to gravity.

[0068] (4) During the movement of magnetic materials with the magnetic field generating device, some non-magnetic materials will be trapped in the bed. The function of the bed strips is to form protrusions and depressions on the surface of the shaking table, so that the materials will "roll" during the movement and release the non-magnetic materials at the bottom of the material (close to the surface of the shaking table). The non-magnetic materials will fall off the surface of the shaking table under the action of gravity, thereby achieving the purpose of gradually separating the magnetic materials from the non-magnetic materials.

[0069] (5) The magnetic material eventually accumulates at the concentrate baffle, while the magnetic field generating device continues to move forward and gradually moves away from the concentrate baffle. At the same time, the magnetic field strength of the concentrate baffle gradually weakens, and the magnetic minerals fall into the concentrate receiving funnel under the action of gravity.

[0070] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0071] Example 1

[0072] The test sample was nickel pyrrhotite purchased from Guangxi, with Ni, Fe, S and Cu grades of 2.58%, 14.46%, 7.60% and 1.83%, respectively. The mineral composition was nickel pyrrhotite, pyrrhotite, chalcopyrite and quartz.

[0073] Dry crushing and screening methods were used to obtain qualified material with 80% of the material being -200 mesh. Then, the material was separated using the gravity dry magnetic separation shaking table described in this application. The magnetic field strength was adjusted to 0.5T, the stroke to 6cm / s, the stroke rate to 10c / min, the bed surface inclination angle to 30°, and the strip height to 1mm to 20mm. Finally, a concentrate product with a Ni grade of 23.65% and a recovery rate of 60.41% and a tailings product with a Ni grade of 1.09% and a recovery rate of 39.59% were obtained.

[0074] Comparative Example 1

[0075] The comparative example used the same test samples as the example, and its grinding fineness and beneficiation process were also consistent with the example.

[0076] In the process of separating nickel-bearing pyrite ore, dry crushing and screening are first used to obtain qualified material with 80% of the material being -200 mesh. Then, a dry magnetic separator is used for separation with a magnetic field strength of 0.5T and a drum speed of 30r / min. Finally, nickel concentrate with a Ni grade of 3.60% and a recovery rate of 55.06% and tailings with a Ni grade of 2.01% and a recovery rate of 44.94% are obtained.

[0077] The above content is only a specific implementation example of this application, and not all application examples of this application. All schemes that follow the technical concept of this application or make modifications based on the technical concept of this application are within the protection scope of the claims of this application.

Claims

1. A gravity-driven dry magnetic separation shaker, comprising a shaker bed surface (1), characterized in that: Below the shaking table surface (1), there are a tailings receiving funnel (3) and a concentrate receiving funnel (5) in sequence. On the lower surface of the shaking table surface (1) near the concentrate receiving funnel (5), there is a concentrate baffle (6). The concentrate baffle (6) is fixedly connected to the bottom of the shaking table surface (1). A magnetic field generating device (7) is provided above the rocking bed surface (1). The magnetic field generating device (7) is mounted on a magnetic device support frame (8). The area above the bed surface is the moving area of ​​the magnetic field generating device. The rocking bed surface (1) is relatively stationary, while the magnetic field generating device (7) moves back and forth but forward as a whole. The area below the shaking table surface (1) is a gravity-magnetic-gravity separation area; The lower surface of the rocking bed is provided with bed strips (10) of different heights and installed in parallel. The direction of movement of the magnetic field generating device (7) is perpendicular to the installation direction of the bed strips (10). In the feeding area (101), the height of the bed strips (10) is relatively small; In the concentrate area (102), the height of the bed strips (10) is relatively large, and the height of the bed strips gradually increases from small to large.

2. The gravity-driven dry magnetic separator according to claim 1, characterized in that: The shaking table surface (1) has an angle θ with the horizontal direction, where 0° < θ < 30°.

3. The gravity-driven dry magnetic separator according to claim 1, characterized in that: The shaking table surface (1) is supported by several supports (11), and a mobile feeder (12) is provided on one side of each support (11).

4. The gravity-driven dry magnetic separator according to claim 3, characterized in that: The mobile feeder (12) is equipped with a feed hopper (1201), which can be moved and rotated at a set angle.

5. The gravity-driven dry magnetic separator according to claim 1, characterized in that: A middlings receiving funnel (4) is provided between the tailings receiving funnel (3) and the concentrate receiving funnel (5).

6. The gravity-driven dry magnetic separator according to claim 1, characterized in that, The magnetic field generating device (7) is a permanent magnet or an electromagnet.

7. The gravity-driven dry magnetic separator according to claim 1, characterized in that, The magnetic device support frame (8) is provided with a slide rail (9), and the magnetic field generating device (7) can reciprocate along the slide rail (9).

8. The gravity-driven dry magnetic separator according to claim 7, characterized in that, The side of the shaking table (1) is provided with a drive device (13), which is connected to the magnetic field generating device (7) for transmission.

9. The application of the gravity-driven dry magnetic separation shaking table according to any one of claims 1 to 8 in the separation of magnetic minerals, characterized in that, include: S1. The mixture of magnetic and non-magnetic minerals is transferred to the feed hopper (1201) of the mobile feeder. The feed hopper (1201) is moved to the feeding area (101) of the shaking table and is parallel and close to the shaking table surface. S2. The initial position of the magnetic field generating device (7) above the shaking table is above the feeding area (101). It will generate a local magnetic field and adsorb the material in the feeding hopper (1201) below the shaking table onto the shaking table (1). S3. The magnetic field generating device (7) moves along the slide rail (9) from the feeding area (101) to the concentrate area (102). Its movement is characterized by back-and-forth motion, but the forward stroke is greater than the backward stroke, so the whole moves forward. During the movement of the magnetic field generating device (7) relative to the shaking table surface, the magnetic field of the shaking table surface changes. Magnetic minerals will move with the movement of the magnetic field generating device, while non-magnetic minerals will fall directly into the tailings receiving funnel (3) due to gravity. S4. During the movement of magnetic materials with magnetic field generating device (7), some non-magnetic materials will be trapped in the material layer. The function of bed strip (10) is to form protrusions and depressions on the surface of the shaking table, so that the material will "roll" during the movement and release the non-magnetic materials at the bottom of the material layer. The non-magnetic materials will fall off the surface of the shaking table under the action of gravity, thereby achieving the purpose of gradually separating magnetic materials from non-magnetic materials. S5. The magnetic material eventually accumulates at the concentrate baffle (6), while the magnetic field generating device (7) continues to move forward and gradually moves away from the concentrate baffle (6). At the same time, the magnetic field strength of the concentrate baffle (6) gradually weakens, and the magnetic minerals fall into the concentrate receiving funnel (5) under the action of gravity.

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