Magnetic arc suitable for weak magnetic mineral separation

Abstract

The utility model discloses a magnetic arc suitable for weakly magnetic mineral separation, which comprises a feeding pipe, a rotary drum rotationally arranged relative to the feeding pipe, a fixed magnetic steel component positioned outside the rotary drum, and a fan-shaped collecting hopper positioned in the rotary drum and connected with the feeding pipe. A plurality of water spraying holes are formed in the front surface of the backwashing water pipe; and the water spraying holes are arranged over against the inner wall of the rotary drum. Compared with the prior art, energy is saved, consumption is reduced, discharging of the rotary drum is more convenient and easier, discharging of materials is more complete under the common action of the ore discharging water pipe and the concentrate scraper, a Halbach array is adopted in the magnetic system structure, higher field intensity can be generated, and the Halbach array magnetic system structure can maximize the magnetic field of the permanent magnet. And a higher induced magnetic field is generated. And more energy loss does not need to be provided. A higher magnetic field means that the enrichment rate of magnetic iron in lean ore can be maximized.

Description

Technical Field

[0001] The utility model relates to the field of magnetic separation of weak magnetic minerals, in particular to a magnetic arc suitable for separation of weak magnetic minerals. Background Art

[0002] The magnetic separation process is generally manifested as the interaction between magnetism and gravity. In the magnetic field, the magnetic force on the magnetic mineral particles is much greater than their own gravity. Therefore, the magnetic mineral particles are sucked from the slurry to the surface of the magnetic separator drum under the action of the magnetic force, and the non-magnetic mineral particles settle under the action of gravity, thus completing the separation process.

[0003] For fine-grained mineral particles, their stress conditions have undergone a major change. For magnetic minerals, as the particle size of mineral particles decreases, the difference between the gravity, buoyancy and magnetic force they are subjected to gradually decreases, making it increasingly difficult to adsorb minerals. When this difference is small to a certain extent, the magnetic mineral particles are suspended in the slurry and move toward the direction close to the magnetic separator drum under the action of the disturbed flow field and are difficult to settle. The movement direction of fine-grained non-magnetic minerals is consistent with that of magnetic minerals. In the process of magnetic mineral particles moving toward the magnetic separator drum to form magnetic agglomerations, the fine-grained non-magnetic mineral particles are wrapped on the surface of the magnetic separator drum. Since fine-grained non-magnetic minerals are difficult to settle, the non-magnetic mineral particles removed during the flipping of the magnetic agglomerates along the drum surface will be captured by the magnetic agglomerates again and are difficult to remove, which will not only cause the quality of the concentrate to decline, but also reduce the recovery rate of weakly magnetic minerals.

[0004] For example, the company previously applied for a utility model patent, CN219723219U, which discloses a magnetic separation device for fine-grained weakly magnetic minerals. This device also has the following disadvantages:

[0005] During magnetic separation, some magnetic minerals will have non-magnetic materials wrapped around the magnetic material when passing through the magnetic field, resulting in low grade after magnetic separation and inability to achieve fine screening. Summary of the invention

[0006] In order to solve the above technical problems, the inventors have obtained the technical solution of the utility model through practice and summary. The utility model adopts the following technical solution:

[0007] A magnetic arc suitable for the separation of weakly magnetic minerals, comprising a feed pipe, a rotating drum rotatably arranged relative to the feed pipe, a fixed magnetic steel assembly located outside the rotating drum, and a fan-shaped collecting hopper located in the rotating drum and connected to the feed pipe. The invention is characterized in that it also comprises a backwashing water pipe inserted into the feed pipe and having a plurality of water spray holes on the front side, and the water spray holes are arranged directly opposite to the inner wall of the rotating drum.

[0008] Preferably, the backwash water pipe includes an axial section one, an axial section two, and a radial section. The axial section one is inserted into the feed pipe, the radial section runs through the feed pipe and its two ends are respectively connected to the axial section one and the axial section two, the radial section is horizontally arranged, and the axial section two is located in the drum and close to the inner wall of the drum.

[0009] In a preferred embodiment, one end of the feeding tube is a feeding inlet, and the other end is a magnetic material outlet;

[0010] The feed inlet end is equipped with an unloading water pipe and a feed inlet pipe. The unloading water pipe is installed on the fan-shaped collecting hopper, and a water outlet inclined hole is provided on it. The water outlet inclined hole is used to wash the inner wall of the drum.

[0011] The magnetic material outlet is connected to the fan-shaped collecting hopper for discharging the magnetic material;

[0012] A baffle is arranged between the feed inlet and the magnetic material outlet.

[0013] Preferably, a concentrate scraper is installed on the fan-shaped collecting hopper, and the concentrate scraper is located below and behind the ore unloading water pipe.

[0014] Preferably, the fixed magnetic steel assembly includes a yoke and a magnetic group fixed to the yoke, and the magnetic group is arranged in a Halbach array.

[0015] Preferably, the overall cross-section of the magnetic group is a semi-ring structure and is deflected 30-60° relative to the top in the opposite direction of the rotating drum.

[0016] Preferably, a driven pulley is installed at one end of the rotating drum;

[0017] The magnetic arc also includes a reduction motor, which drives the driven pulley to rotate via a driving pulley and a belt at the output end.

[0018] Beneficial Effects

[0019] Compared with the traditional structure, this solution saves energy and reduces consumption. The drum unloading is more convenient and easy. Under the joint action of the unloading water pipe and the concentrate scraper, the material is unloaded more completely. The magnetic system structure adopts the Halbach array to generate a higher field strength. The structure of the Halbach array magnetic system can maximize the magnetic field of the permanent magnet. Produce a higher induced magnetic field. No more energy loss is required. A higher magnetic field means that the enrichment rate of magnetic iron in lean ore can be maximized.

[0020] The magnetic steel layout adopts Halbach array, which will generate a super strong magnetic field on the inner surface of the drum. The magnetic field intensity is greater than 1T. Under the action of the strong magnetic field, the magnetic material will be adsorbed on the wall of the drum, and the magnetic material adsorbed on the drum will roll, and the material will be purified under the action of backwash water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an axial cross-sectional view of the rotary drum of the utility model;

[0022] Figure 2 It is a radial cross-sectional view of the rotary drum of the utility model;

[0023] Figure 3 It is a top view of the magnetic arc;

[0024] Figure 4 This is the structural diagram of the backwash water pipe. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a magnetic arc suitable for the separation of weak magnetic minerals includes a feed pipe 1, a drum 2 rotatably arranged relative to the feed pipe 1, a fixed magnetic steel assembly 3 located outside the drum 2, and a fan-shaped collecting hopper 4 located in the drum 2 and connected to the feed pipe 1, characterized in that it also includes a backwashing water pipe 5 inserted in the feed pipe 1 and provided with a plurality of water spray holes on the front, and the water spray holes are arranged facing the inner wall of the drum 2. Through the backwashing water pipe 5, the magnetic material is adsorbed on the inner wall of the drum 2 under the action of the magnetic field generated by the fixed magnetic steel assembly 3, and is washed and purified to remove the entrained non-magnetic materials, complete the purification process, and facilitate the loss of the magnetic field effect later, and fall into the fan-shaped collecting hopper 4 under the action of gravity to complete the selection of weak magnetic minerals.

[0029] Embodiment 2, in a magnetic arc, such as Figure 4As shown, the backwash water pipe 5 includes an axial section 1 51, an axial section 2 52, and a radial section 53. The axial section 1 51 is inserted into the feed pipe 1, and the radial section 53 runs through the feed pipe 1 and its two ends are respectively connected to the axial section 1 51 and the axial section 2 52. The radial section 53 is horizontally arranged and is in the horizontal plane where the axis of the drum 2 is located. The axial section 2 52 is located in the drum 2 and is arranged close to the inner wall of the drum 2, and the end away from the radial section 53 is a closed end. The horizontally arranged radial section is directly facing the inner wall of the drum 2 to disperse the weak magnetic particles, and the weak magnetic particles are controlled as much as possible not to be blown up or down, thereby ensuring the screening efficiency.

[0030] Embodiment 3, as Figure 1 As shown, in the magnetic arc, one end of the feed pipe 1 is the feed inlet end, and the other end is the magnetic material outlet end;

[0031] The feed inlet end is provided with an unloading water pipe 11 and a feed inlet pipe 12. The unloading water pipe 11 is installed on the fan-shaped collecting hopper 4, and is provided with a water outlet inclined hole, which is used to wash the inner wall of the drum 2;

[0032] The magnetic material outlet is connected to the fan-shaped collecting hopper 4 for discharging the magnetic material;

[0033] A baffle is arranged between the feed inlet and the magnetic material outlet.

[0034] The material enters the drum 2 through the feed inlet pipe 12. The drum 2 rotates, and the fixed magnetic steel assembly 3 generates a magnetic field to adsorb the magnetic material on the drum 2. After rotating to the top, due to the existence of the unloading water pipe 11, the magnetic material will fall into the fan-shaped collecting hopper 4 under the action of gravity and impact, realizing the automatic collection of the magnetic material, and finally discharged from the magnetic material outlet.

[0035] Embodiment 4, in a magnetic arc, such as Figure 1 As shown, the drum 2 still has a residual magnetic field when it is out of the magnetic field, especially the strong magnetic material is difficult to remove, which will shield the magnetic field over time and make the equipment lose its effect, so a concentrate scraper 41 is installed on the fan-shaped collecting hopper 4, and the concentrate scraper 41 is located at the lower rear side of the unloading water pipe 11. After the unloading water pipe 11 is flushed and unloaded, it is scraped again to make the unloading more complete.

[0036] Example 5, in a magnetic arc, such as Figure 2 As shown, the fixed magnetic steel assembly 3 includes a magnetic yoke 31 and a magnetic group 32 fixed to the magnetic yoke 31 , and the magnetic group 32 is arranged in a Halbach array.

[0037] The overall cross-section of the magnetic group 32 is a semi-ring structure and is deflected 30-60°, preferably 30°, relative to the top in the direction opposite to the rotation direction of the drum 2 .

[0038] Example 6, in a magnetic arc, such as Figure 1 and Figure 3As shown, a driven pulley 21 is installed at one end of the rotating drum 2;

[0039] The magnetic arc further includes a reduction motor 22, which drives the driven pulley 21 to rotate via a driving pulley and a belt at the output end.

[0040] Working principle: the reduction motor 22 includes a driving motor and a reducer. The reduction motor 22 drives the drum 2 to rotate through the active pulley, belt, and driven pulley 21. The feeding pipe 1 does not rotate, and the slurry enters the drum 2 through the feeding inlet pipe 12. The magnetic field (intensity greater than 1T) generated by the magnetic group 32 adsorbs the magnetic material on the drum 2, and it is flushed and cleaned through the backwash water pipe 5. Then it passes through the top of the magnetic field and enters the material drop area. It will fall off by gravity at the top of the fan-shaped collecting hopper 4. The unloading water pipe 11 flushes part of the magnetic material down through the water outlet inclined hole, and finally completes the unloading through the concentrate scraper 41 and is discharged from the magnetic material outlet. The slurry after magnetic separation is discharged from the bottom end cover of the drum.

[0041] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution and inventive concept of the utility model should be included in the protection scope of the utility model.

Claims

1. A magnetic arc suitable for the separation of weakly magnetic minerals, comprising a feed pipe (1), a drum (2) rotatably arranged relative to the feed pipe (1), a fixed magnetic steel assembly (3) located outside the drum (2), and a fan-shaped collecting hopper (4) located inside the drum (2) and connected to the feed pipe (1), characterized in that: It also includes a backwash water pipe (5) which is inserted into the feed pipe (1) and has a plurality of water spray holes arranged on the front side, wherein the water spray holes are arranged facing the inner wall of the rotating drum (2).

2. A magnetic arc suitable for separation of weak magnetic minerals according to claim 1, characterized in that: The backwash water pipe (5) comprises an axial section one (51), an axial section two (52), and a radial section (53); the axial section one (51) is inserted into the feed pipe (1); the radial section (53) passes through the feed pipe (1) and its two ends are respectively connected to the axial section one (51) and the axial section two (52); the radial section (53) is arranged horizontally; and the axial section two (52) is located in the drum (2) and is arranged close to the inner wall of the drum (2).

3. A magnetic arc suitable for separation of weak magnetic minerals according to claim 2, characterized in that: One end of the feeding pipe (1) is a feeding inlet, and the other end is a magnetic material outlet; A discharge water pipe (11) and a feed inlet pipe (12) are installed in the feed inlet end. The discharge water pipe (11) is installed on the fan-shaped collecting hopper (4) and is provided with a water outlet inclined hole, which is used to wash the inner wall of the rotating drum (2). The magnetic material outlet is connected to the fan-shaped collecting hopper (4) for discharging the magnetic material; A baffle is arranged between the feed inlet and the magnetic material outlet.

4. A magnetic arc suitable for separation of weak magnetic minerals according to claim 2, characterized in that: The fan-shaped collecting hopper (4) is provided with a concentrate scraper (41), and the concentrate scraper (41) is located at the lower rear side of the ore unloading water pipe (11).

5. The magnetic arc suitable for separation of weak magnetic minerals according to claim 2, characterized in that: The fixed magnetic steel component (3) comprises a magnetic yoke (31) and a magnetic group (32) fixed to the magnetic yoke (31), and the magnetic group (32) is arranged in a Halbach array.

6. A magnetic arc suitable for separation of weak magnetic minerals according to claim 5, characterized in that: The overall cross-section of the magnetic group (32) is a semi-ring structure and is deflected 30-60 degrees relative to the top in the opposite direction of rotation of the rotating drum (2).

7. A magnetic arc suitable for separation of weak magnetic minerals according to claim 2, characterized in that: A driven pulley (21) is installed at one end of the rotating drum (2); The magnetic arc further comprises a reduction motor (22), and the reduction motor (22) drives the driven pulley (21) to rotate via a driving pulley and a belt at an output end.

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