Two-stage magnetic separation system

Abstract

The utility model relates to the technical field of material magnetic separation and recovery, in particular to a two-stage magnetic separation system which comprises a storage bin, the storage bin is connected with a screening device through a feeding pipeline, and a feeding fan is arranged on the feeding pipeline; a coarse material outlet and a fine material outlet are formed in the screening device, the coarse material outlet is connected with the first magnetic separation device, and the fine material outlet is connected with the black powder bin; the first magnetic separation device is provided with a first magnetic trough and a first non-magnetic trough, the first non-magnetic trough is connected with the second magnetic separation device through the feeding device, and the second magnetic separation device is provided with a second magnetic trough and a second non-magnetic trough; the first magnetic separation device and the second magnetic separation device are respectively connected with a negative pressure pipeline which is connected with the storage bin. According to the utility model, materials can be magnetically separated twice, so that the magnetic separation is more thorough; the situation that dust drifts away and pollutes the environment in the magnetic separation process can be avoided, meanwhile, the powdery materials can be further recycled, and the recycling rate of the materials is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of material magnetic separation and recovery, in particular to a secondary magnetic separation system. Background Art

[0002] Waste lithium batteries contain numerous recyclable components, including valuable metals and organic matter. Safe and efficient recycling of lithium batteries is a key issue in sustainable resource utilization. Existing waste lithium battery recycling processes primarily involve crushing the batteries, followed by high-temperature pyrolysis, screening, and sorting to recover products such as black powder, copper, iron, and aluminum.

[0003] In the recycling process of waste lithium batteries, the crushed waste lithium batteries are crushed and then subjected to high-temperature pyrolysis to obtain a pyrolysis mixture, that is, a mixture of iron, copper, aluminum and black powder. Most of the powdered black powder is then screened and separated. The components of the remaining pyrolysis mixture after screening are mainly iron particles, copper particles and aluminum particles. The iron particles are ferromagnetic. Therefore, in the existing technology, the iron particles in the pyrolysis mixture are generally separated by a magnetic separation device, which is convenient for the separate recycling of this part of iron, and is also conducive to the subsequent separation of copper and aluminum.

[0004] Magnetic separation devices typically transport the pyrolysis mixture via a conveyor belt. A magnetic attraction device is installed above a portion of the conveyor belt to absorb the magnetic material (i.e., iron particles) in the pyrolysis mixture, achieving magnetic separation. However, some black powder remains in the pyrolysis mixture after screening. This black powder hinders the magnetic attraction device from absorbing the magnetic material, resulting in incomplete magnetic separation. Furthermore, existing magnetic separation devices are unable to recycle this black powder, resulting in a low resource recovery rate. Furthermore, dust is easily dispersed during the magnetic separation process, causing environmental pollution and posing a safety hazard. Utility Model Content

[0005] In view of the technical problems in the prior art of using magnetic separation devices to perform magnetic separation on pyrolysis mixtures, such as incomplete magnetic separation, difficulty in recycling black powder, low resource recovery rate, and easy pollution, the utility model provides a two-stage magnetic separation system, which can perform two magnetic separations on the material through a first magnetic separation device and a second magnetic separation device, making the magnetic separation more thorough; it can avoid the situation where dust is scattered and polluting the environment during the magnetic separation process, and at the same time, the powdered material can be further recycled to improve the material recovery rate.

[0006] The utility model provides a secondary magnetic separation system, comprising a storage bin, which is connected to a screening device via a feed pipe, and a feed fan is provided on the feed pipe;

[0007] The screening device is provided with a coarse material discharge port and a fine material discharge port, the coarse material discharge port is connected to the first magnetic separation device, and the fine material discharge port is connected to the black powder bin;

[0008] The first magnetic separation device is provided with a first magnetic material trough and a first non-magnetic material trough. The first non-magnetic material trough is connected to the feed port of the second magnetic separation device through a feeding device. The second magnetic separation device is provided with a second magnetic material trough and a second non-magnetic material trough. The first magnetic separation device and the second magnetic separation device are respectively connected to the negative pressure pipe, and the negative pressure pipe is connected to the storage bin.

[0009] When the secondary magnetic separation system of the present invention is used to magnetically separate the pyrolysis mixture, the pyrolysis mixture is first sent to the storage bin for collection, and then enters the screening device for screening under the action of the feed fan. After screening, the black powder mixed in the pyrolysis mixture enters the black powder bin from the fine material discharge port, which is convenient for further recycling of the black powder; the remaining powdery material is discharged from the coarse material discharge port and enters the feed port of the first magnetic separation device for the first magnetic separation. The powdery material raised during the first magnetic separation process is absorbed into the negative pressure pipeline and further returned to the storage bin for recycling.

[0010] After the first magnetic separation, most of the iron is discharged through the first magnetic trough, and the remaining material is the first non-magnetic material, which is sent to the second magnetic separation device through the feeding device for the second magnetic separation. The powdery material raised during the second magnetic separation process is absorbed into the negative pressure pipe and further returned to the storage bin for recycling.

[0011] After the second magnetic separation, the remaining iron in the first non-magnetic material is discharged through the second magnetic material trough, and the remaining material is the second non-magnetic material, which is discharged through the second non-magnetic material trough.

[0012] Furthermore, the first magnetic separation device and the second magnetic separation device are both dry magnetic separators.

[0013] Furthermore, the first magnetic separation device includes a first material conveyor belt, which is connected to the first base frame; a first magnetic material conveyor belt and a first dust removal cover are arranged above the first material conveyor belt, a first magnet is arranged inside the first magnetic material conveyor belt, and the first dust removal cover is connected to the negative pressure pipe; a first non-magnetic material trough is arranged below the discharge end of the first material conveyor belt, and a first magnetic material trough is arranged below the discharge end of the first magnetic material conveyor belt;

[0014] The second magnetic separation device includes a second material conveyor belt, which is connected to the second base frame; a second magnetic material conveyor belt and a second dust removal cover are arranged above the second material conveyor belt, a second magnet is arranged on the inside of the second magnetic material conveyor belt, and the second dust removal cover is connected to the negative pressure pipe; a second non-magnetic material trough is arranged below the discharge end of the second material conveyor belt, and a second magnetic material trough is arranged below the discharge end of the second magnetic material conveyor belt.

[0015] Furthermore, the feeding device is selected from a belt conveyor, a screw feeder or a wind conveyor.

[0016] Furthermore, the first magnetic material trough and the second magnetic material trough are both connected to the iron pellet bin.

[0017] Furthermore, the mesh size of the screening device is 100-300 μm.

[0018] Furthermore, the screening device is a swing screen or a drum screen.

[0019] The beneficial effects of the present invention are:

[0020] The secondary magnetic separation system provided by the utility model connects the first non-magnetic material trough of the first magnetic separation device with the feed port of the second magnetic separation device through a feeding device, and the non-magnetic material after magnetic separation by the first magnetic separation device can be magnetically separated by the second magnetic separation device, so that the magnetic separation is more thorough; the first magnetic separation device and the second magnetic separation device are both connected to a negative pressure pipe, and powdery materials such as dust in the material can be collected through the negative pressure pipe into a storage bin for recycling treatment, thereby avoiding the situation where dust is scattered and polluting the environment during the magnetic separation process, and at the same time, this part of the powdery material can be further recycled to improve the recycling rate of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a structural diagram of the secondary magnetic separation system in Example 1.

[0023] Figure 2 This is a schematic structural diagram of the first magnetic separation device in Example 1.

[0024] Figure 3 This is a schematic structural diagram of the second magnetic separation device in Example 1.

[0025] In the figure, 1-first magnetic separation device, 11-feeding device, 12-negative pressure pipe, 13-feed fan, 101-first material conveyor belt, 102-first base frame, 103-first magnetic material conveyor belt, 104-first magnet, 105-first dust removal cover, 106-first non-magnetic material trough, 107-first magnetic material trough, 2-second magnetic separation device, 201-second material conveyor belt, 202-second base frame, 203-second magnetic material conveyor belt, 204-second magnet, 205-second dust removal cover, 206-second non-magnetic material trough, 207-second magnetic material trough, 3-storage bin, 4-screening device, 5-black powder bin, 6-iron pellet bin. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] Example 1

[0028] A secondary magnetic separation system includes a storage bin 3 connected to a screening device 4 via a feed pipe, and a feed fan 13 is provided on the feed pipe;

[0029] The screening device 4 is a swing screen with a mesh size of 100-300 μm. The screening device 4 is provided with a coarse material discharge port and a fine material discharge port. The coarse material discharge port is connected to the first magnetic separation device 1, and the fine material discharge port is connected to the black powder bin 5.

[0030] The first magnetic separation device 1 is a dry magnetic separator, including a first material conveyor belt 101, which is connected to a first base frame 102; a first magnetic material conveyor belt 103 and a first dust removal cover 105 are arranged above the first material conveyor belt 101, a first magnet 104 is arranged inside the first magnetic material conveyor belt 103, and the first dust removal cover 105 is connected to the negative pressure pipe 12; a first non-magnetic material trough 106 is arranged below the discharge end of the first material conveyor belt 101, and a first magnetic material trough 107 is arranged below the discharge end of the first magnetic material conveyor belt 103, and the first magnetic material trough 107 is connected to the iron pellet bin 6;

[0031] The first non-magnetic trough 106 is connected to the feed port of the second magnetic separation device 2 through the feeding device 11. The feeding device 11 is a belt conveyor. The second magnetic separation device 2 is a dry magnetic separator, including a second material conveyor belt 201, and the second material conveyor belt 201 is connected to the second base frame 202; a second magnetic material conveyor belt 203 and a second dust removal cover 205 are arranged above the second material conveyor belt 201, a second magnet 204 is arranged on the inside of the second magnetic material conveyor belt 203, and the second dust removal cover 205 is connected to the negative pressure pipe 12; a second non-magnetic trough 206 is arranged below the discharge end of the second material conveyor belt 201, and a second magnetic trough 207 is arranged below the discharge end of the second magnetic material conveyor belt 203, and the second magnetic trough 207 is connected to the iron particle bin 6;

[0032] The negative pressure pipe 12 is connected to the storage bin 3 .

[0033] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A secondary magnetic separation system, comprising a storage silo, characterized in that: The storage bin is connected to the screening device through a feed pipe, and a feed fan is provided on the feed pipe; The screening device is provided with a coarse material discharge port and a fine material discharge port, the coarse material discharge port is connected to the first magnetic separation device, and the fine material discharge port is connected to the black powder bin; The first magnetic separation device is provided with a first magnetic material trough and a first non-magnetic material trough. The first non-magnetic material trough is connected to the feed port of the second magnetic separation device through a feeding device. The second magnetic separation device is provided with a second magnetic material trough and a second non-magnetic material trough. The first magnetic separation device and the second magnetic separation device are respectively connected to the negative pressure pipe, and the negative pressure pipe is connected to the storage bin.

2. The secondary magnetic separation system according to claim 1, characterized in that: The first magnetic separation device and the second magnetic separation device are both dry magnetic separators.

3. The secondary magnetic separation system according to claim 1, characterized in that: The first magnetic separation device includes a first material conveyor belt, which is connected to a first base frame; a first magnetic material conveyor belt and a first dust removal cover are arranged above the first material conveyor belt, a first magnet is arranged inside the first magnetic material conveyor belt, and the first dust removal cover is connected to a negative pressure pipe; a first non-magnetic material trough is arranged below the discharge end of the first material conveyor belt, and a first magnetic material trough is arranged below the discharge end of the first magnetic material conveyor belt; The second magnetic separation device includes a second material conveyor belt, which is connected to the second base frame; a second magnetic material conveyor belt and a second dust removal cover are arranged above the second material conveyor belt, a second magnet is arranged on the inside of the second magnetic material conveyor belt, and the second dust removal cover is connected to the negative pressure pipe; a second non-magnetic material trough is arranged below the discharge end of the second material conveyor belt, and a second magnetic material trough is arranged below the discharge end of the second magnetic material conveyor belt.

4. The secondary magnetic separation system according to claim 1, characterized in that: The feeding device is selected from a belt conveyor, a screw feeder or a wind conveyor.

5. The secondary magnetic separation system according to claim 1, characterized in that: The first magnetic material trough and the second magnetic material trough are both connected to the iron pellet bin.

6. The secondary magnetic separation system according to claim 1, characterized in that: The sieve aperture of the screening device is 100-300 μm.

7. The secondary magnetic separation system according to claim 1, characterized in that: The screening device is a swing screen or a drum screen.

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