Powder online dry magnetic separator

Abstract

The utility model discloses an on-line dry magnetic separator for powder, and belongs to the technical field of dry magnetic separation equipment. The magnetic separator comprises a magnetic separator body shell, a first-stage non-magnetic-conductive magnetic separation sleeve and a second-stage non-magnetic-conductive magnetic separation sleeve, the interior of the shell, the first-stage non-magnetic-conductive magnetic separation sleeve and the second-stage non-magnetic-conductive magnetic separation sleeve are combined to form a sealed magnetic separation inner cavity, a feeding and discharging pipeline is arranged on the magnetic separator body shell, and the feeding and discharging pipeline is connected with a powder conveying system. An electromagnetic magnetic system assembly and an auxiliary separation and separation assembly are arranged in the magnetic separation inner cavity; and the electromagnetic system assembly and the auxiliary separating and sorting assembly are respectively controlled to move through corresponding power mechanisms. According to the dry-type online magnetic separation device, the electromagnet is adopted to replace a common permanent magnet, the high-efficiency dry-type online magnetic separation device is directly constructed on a pipeline or at the tail end of a conveying system on the premise that a raw powder pneumatic conveying system is not greatly transformed, and two-stage or multi-stage separation is realized in magnetic separation equipment; and magnetic components with relatively high purity can be effectively obtained through magnetic separation or can be used as an iron removal process of fine powder.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry magnetic separation equipment, in particular to an online dry magnetic separator for powder, which is suitable for online dry magnetic separation of fly ash or similar fine powders. Background Art

[0002] Existing dry magnetic separation equipment generally includes electromagnetic and permanent magnet types. They mainly use the magnetic field strength or magnetic field strength gradient of the magnetic system to separate magnetic components from non-magnetic components. Due to the inherent characteristics of dry fine powders, magnetic particles are affected by magnetic field forces, gravity and mutual forces in the magnetic field. Although non-magnetic particles have no magnetic response in the magnetic field, they will be attracted and pushed by magnetic particles. Fine powders are affected by multiple forces in the magnetic field and have strong agglomeration forces that are difficult to disperse. This leads to problems such as poor sorting efficiency and excessive product entrainment in magnetic separation equipment. Even if some equipment introduces vibration or wind sweeping designs, it still cannot fundamentally improve the dispersibility of fine powders during the magnetic separation process. At the same time, pneumatic conveying is generally used for the transportation of dry fine powders in industry. The powder has a certain speed and pressure when flowing with compressed air in the pipeline. It is also difficult for currently available dry magnetic separation equipment to achieve online sorting. Utility Model Content

[0003] In order to overcome the shortcomings of the above-mentioned existing equipment, the purpose of the utility model is to provide an online dry magnetic separator for powder, which adopts electromagnets instead of commonly used permanent magnets. Without making major modifications to the original powder pneumatic conveying system, a high-efficiency dry online magnetic separation device is directly constructed on the conveying system pipeline or at the end, and secondary or multi-stage separation is realized inside the magnetic separation equipment, so as to effectively obtain higher-purity magnetic components by magnetic separation or serve as a de-ironing process for fine powder.

[0004] In order to achieve the above purpose, the technical measures adopted by this utility model are:

[0005] A powder online dry magnetic separator comprises a magnetic separator body shell and a primary non-magnetic magnetic separation sleeve and a secondary non-magnetic magnetic separation sleeve arranged in the magnetic separator body shell. The interior of the magnetic separator body shell and the primary non-magnetic magnetic separation sleeve and the secondary non-magnetic magnetic separation sleeve are combined to form a sealed magnetic separation inner cavity. The magnetic separator body shell is provided with an inlet and outlet pipe connected to the magnetic separation inner cavity. The inlet and outlet pipes are connected to a powder conveying system. An electromagnetic magnetic system component for magnetic separation and material separation and an auxiliary separation and sorting component for auxiliary separation are provided in the magnetic separation inner cavity. The electromagnetic magnetic system component and the auxiliary separation and sorting component are respectively controlled to move by corresponding power mechanisms.

[0006] Furthermore, the electromagnetic magnetic system assembly includes a first-level electromagnetic magnetic separation roller and a second-level electromagnetic magnetic separation roller rotatably arranged in the magnetic separation inner cavity, and at least one group of electromagnet units are provided inside the two electromagnetic magnetic separation rollers; the first-level non-magnetic magnetic separation sleeve and the second-level non-magnetic magnetic separation sleeve are respectively sleeved on the outside of the first-level electromagnetic magnetic separation roller and the second-level electromagnetic magnetic separation roller, and fixed on the outer shell of the magnetic separator body.

[0007] Furthermore, the auxiliary separation and sorting component includes an impeller screw conveyor for receiving the powder after screening by the first-level non-magnetic magnetic separation casing, an auxiliary air blowing device for blowing away lightweight non-magnetic powder, and an auxiliary sorting grid and guide plate for further separating the powder blown by the auxiliary air blowing device.

[0008] Furthermore, the secondary non-magnetic magnetic separation casing is arranged at the lower side of the primary non-magnetic magnetic separation casing, and the impeller screw conveyor and the auxiliary sorting grid and guide plate are arranged between the primary non-magnetic magnetic separation casing and the secondary non-magnetic magnetic separation casing; the auxiliary sorting grid and guide plate are arranged at an angle, and the auxiliary air blowing device is located at the upper side of the auxiliary sorting grid and guide plate, and its air outlet is arranged corresponding to the auxiliary sorting grid and guide plate.

[0009] Furthermore, the outer sides of the primary non-magnetic conductive magnetic separation casing and the secondary non-magnetic conductive magnetic separation casing are both provided with a raised horizontal bar structure or a grid structure.

[0010] Furthermore, the magnetic separator body shell is provided with a magnetic separator feed pipe, a non-magnetic powder outlet pipe and a magnetic separation powder outlet pipe for discharging the magnetic powder after sorting treatment; a powder dispersion device is provided at the connection between the magnetic separator feed pipe and the magnetic separator body shell.

[0011] Furthermore, 6-8 groups of electromagnet units are provided inside the first-level electromagnetic magnetic separation roller and the second-level electromagnetic magnetic separation roller, and the magnetic field strength of the two is 8000GS-12000GS.

[0012] Furthermore, Hall sensors are provided on the inner walls of the primary non-magnetic magnetic separation sleeve and the secondary non-magnetic magnetic separation sleeve for sensing the rotation angle of the corresponding electromagnetic roller and controlling the on and off of the single set of electromagnets to form the required working magnetic field.

[0013] Furthermore, both the primary non-magnetic separation casing and the secondary non-magnetic separation casing are provided with ultrasonic vibration devices to reduce the interaction force between the moving powders on the casing surface.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) In the present invention, based on the innovative structural design that the non-magnetic magnetic separation sleeve is fixed to the magnetic separator housing and the magnetic separation roller is embedded in the non-magnetic magnetic separation sleeve, the non-magnetic magnetic separation sleeve and the magnetic separator housing together form a completely sealed magnetic separation inner cavity, thereby realizing the nesting of an online magnetic separation device on the powder conveying system or at the end; at the same time, it also solves the problem of magnetic materials adhering to the magnetic inner tube to form accumulation when the traditional dry magnetic separator is working;

[0016] (2) In the present invention, a strip-shaped protrusion structure is provided on the outer surface of the non-magnetic magnetic separation sleeve, and an ultrasonic vibration device is provided on the non-magnetic magnetic separation sleeve. When the electromagnetic magnetic separation roller rotates in the non-magnetic magnetic separation sleeve, the magnetic components adsorbed by the magnetic field and the entrained non-magnetic components also move on the surface of the non-magnetic magnetic separation sleeve. The ultrasonic vibration weakens the interaction force between the particles and forms a loose state. During the movement, the strip-shaped protrusion structure causes jumping and flipping, thereby realizing the separation of magnetic and non-magnetic components and reducing the entrainment of non-magnetic components in the product.

[0017] (3) In the present invention, the electromagnetic magnetic system components and auxiliary separation and sorting components are provided to achieve multi-stage sorting and purification, which can effectively improve the content and purity of the obtained magnetic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a main structural diagram of the present utility model.

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0020] Explanation of the accompanying symbols: 1. Magnetic separator feed pipe; 2. Magnetic separator body shell; 3. Powder dispersion device; 4. First-level electromagnetic magnetic separation roller; 5. First-level non-magnetic magnetic separation casing; 6. Impeller screw conveyor; 7. Auxiliary air blowing device; 8. Auxiliary sorting grid and guide plate; 9. Second-level electromagnetic magnetic separation roller; 10. Second-level non-magnetic magnetic separation casing; 11. Rotating motor; 12. Magnetic separation powder outlet pipe; 13. Non-magnetic powder outlet pipe. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. The following description of the embodiments is intended only to facilitate understanding of the present invention. It should be noted that, for those skilled in the art, various modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0022] Example

[0023] A powder online dry magnetic separator is directly embedded in the fly ash conveying pipeline or arranged in front of the next-level fly ash bin at the end of the ash conveying system; it includes a magnetic separator body shell, electromagnetic magnetic system components, auxiliary separation and sorting components and a power mechanism.

[0024] Specifically, the top and bottom of the magnetic separator housing 2 are respectively equipped with a magnetic separator feed pipe 1 and a non-magnetic powder outlet pipe 13, which are connected to the powder conveying system. A magnetic separation powder outlet pipe 12 and a compressed air inlet pipe for auxiliary separation are located in the middle. A powder dispersion device 3 is installed below the magnetic separator feed pipe 1 at the junction with the magnetic separator housing 2. The interior of the magnetic separator housing 2 forms a sealed magnetic separation chamber.

[0025] The transported fly ash enters the magnetic separator body shell 2 through the magnetic separator feed pipe 1, and the magnetic powder obtained after magnetic separation is discharged from the system and collected through the magnetic separation powder outlet pipe 12. The remaining fly ash after magnetic separation returns to the ash conveying system pipeline through the non-magnetic powder outlet pipe 13 or enters the next-level fly ash bin.

[0026] Specifically, the electromagnetic magnetic system component is located in the non-magnetic magnetic separation casing, which includes a first-level electromagnetic magnetic separation roller 4 and a second-level electromagnetic magnetic separation roller 9.

[0027] The first-level electromagnetic magnetic separation roller 4 and the second-level electromagnetic magnetic separation roller 9 are respectively arranged inside the first-level non-magnetic magnetic separation casing 5 and the second-level non-magnetic magnetic separation casing 10. Both magnetic separation rollers can rotate and the speed is controlled by frequency conversion through the corresponding power mechanism to adapt to the conveying flow rate of the powder.

[0028] There are 6 to 8 groups of electromagnet units inside the two electromagnetic separation rollers, and the magnetic field strength of the two is 8000GS-12000GS; the electromagnet units are evenly distributed in a circular pattern inside the electromagnet units, and the current of each group of electromagnet units is controlled by the change of the rotation angle of the corresponding electromagnetic separation roller, thereby forming a special magnetic system with periodic changes during the rotation of the corresponding electromagnetic separation roller.

[0029] The primary non-magnetic separation sleeve 5 and the secondary non-magnetic separation sleeve 10 are respectively mounted on the outside of the primary electromagnetic separation roller 4 and the secondary electromagnetic separation roller 9, and are fixedly mounted on the magnetic separator body housing 2. The outer surfaces of both non-magnetic separation sleeves are provided with a raised grid or horizontal stripe structure of a certain height. Hall sensors are provided on the inner walls of the primary non-magnetic separation sleeve 5 and the secondary non-magnetic separation sleeve 10 to sense the rotation angle of the corresponding electromagnetic roller and control the power on and off of the single set of electromagnets to form the required working magnetic field. Both the primary non-magnetic separation sleeve 5 and the secondary non-magnetic separation sleeve 10 are also provided with ultrasonic vibration devices to reduce the interaction force between the moving powder on the sleeve surface.

[0030] The magnetic components in the powder are attracted by the magnetic field of the electromagnetic roller, and adhere, jump and desorb on the surface of the non-magnetic magnetic separation sleeve, thereby completing the separation from the non-magnetic components.

[0031] Specifically, the auxiliary separation and sorting component is located in the magnetic separation cavity, and includes an impeller screw conveyor 6, an auxiliary air blowing device 7, and an auxiliary sorting grid and guide plate 8.

[0032] The impeller screw conveyor 6 is used to receive the coarse magnetic powder dropped from the non-magnetic magnetic separation casing 5 due to power failure of the electromagnet, and then conduct it to the guide plate 8 of the auxiliary sorting grid machine.

[0033] The auxiliary air blowing device 7 includes an air knife. The auxiliary air blowing device 7 and the material dispersing device 3 both use compressed air as power, so that the coarse magnetic powder is further separated from the non-magnetic powder when passing through the auxiliary sorting grid machine guide plate 8.

[0034] Specifically, the power mechanism includes a set of rotating motors 11, which are used to control the rotation of the first-level electromagnetic magnetic separation roller 4 and the second-level electromagnetic magnetic separation roller 9 inside the non-magnetic magnetic separation casing 5 and the non-magnetic magnetic separation casing 10; and are used to control the rotation angle of the induction electromagnetic magnetic separation roller and the non-magnetic magnetic separation casing.

[0035] The working process of the system in this embodiment is as follows:

[0036] Step 1: Fly ash enters the magnetic separator body shell 2 from the ash conveying pipeline through the magnetic separator feed pipe 1 and is uniformly dispersed by the powder dispersion device 3;

[0037] Step 2: The fly ash is attracted by the magnetic field formed by the primary electromagnetic magnetic separation roller 4 near the primary non-magnetic magnetic separation casing 5, adheres to the surface of the primary non-magnetic magnetic separation casing 5, and follows the rotation of the primary electromagnetic magnetic separation roller 4, moving on the surface of the primary non-magnetic magnetic separation casing 5 to achieve primary separation.

[0038] Step 3: When the first-stage electromagnetic separation roller 4 rotates to a certain angle, the corresponding group of electromagnets is de-energized and demagnetized. The magnetic powder attracted by this group of electromagnets begins to fall onto the impeller screw conveyor 6, which rotates in the opposite direction to the first-stage electromagnetic separation roller 4. As the first-stage electromagnetic separation roller 4 continues to rotate, the de-energized group of electromagnets is restored and continues to attract magnetic powder, thus forming continuous magnetic separation.

[0039] Step 4: The magnetic powder, pushed by the impeller screw conveyor 6, falls evenly and passes through the auxiliary sorting grid and guide plate group 8. During the magnetic process, the auxiliary air blowing device 7 is activated to blow off the light fly ash in the magnetic powder, and the magnetic powder passes through the grid and guide plate group, thus completing the secondary sorting.

[0040] Step 5: When the magnetic powder passes through the auxiliary separation grid and the guide plate group 8 and falls near the secondary non-magnetic magnetic separation sleeve 10, it is attracted by the magnetic field formed by the secondary electromagnetic magnetic separation roller 9, adheres to the surface of the secondary non-magnetic magnetic separation sleeve 10, and follows the rotation of the secondary electromagnetic magnetic separation roller 9, moves on the surface of the secondary non-magnetic magnetic separation sleeve 10, and realizes the three-level separation;

[0041] Step 6: Magnetic Powder Separation: When the secondary electromagnetic separation roller 9 rotates to a certain angle, the corresponding set of electromagnets is de-energized and demagnetized. The magnetic powder attracted by this set of electromagnets begins to fall into the collection tank and, through the periodic opening and closing of the magnetic separation powder outlet pipe 12, is discharged from the magnetic separator under the internal pressure. The remaining non-magnetic fly ash after magnetic separation passes through the non-magnetic powder outlet pipe 13 and returns to the ash conveying pipeline or enters the next-level fly ash silo.

Claims

1. A powder online dry magnetic separator, characterized in that: The invention comprises a magnetic separator body shell (2) and a first-level non-magnetic magnetic separation sleeve (5) and a second-level non-magnetic magnetic separation sleeve (10) arranged in the magnetic separator body shell (2); the interior of the magnetic separator body shell (2) and the first-level non-magnetic magnetic separation sleeve (5) and the second-level non-magnetic magnetic separation sleeve (10) are combined to form a sealed magnetic separation inner cavity; the magnetic separator body shell (2) is provided with an inlet and outlet pipe connected to the magnetic separation inner cavity; the inlet and outlet pipe is connected to the powder conveying system; an electromagnetic magnetic system component for magnetic separation and an auxiliary separation and sorting component for auxiliary separation are provided in the magnetic separation inner cavity; the electromagnetic magnetic system component and the auxiliary separation and sorting component are respectively controlled to move by corresponding power mechanisms.

2. The powder online dry magnetic separator according to claim 1, characterized in that: The electromagnetic magnetic system assembly comprises a first-level electromagnetic magnetic separation roller (4) and a second-level electromagnetic magnetic separation roller (9) rotatably arranged in the magnetic separation inner cavity, and at least one group of electromagnet monomers are provided inside the two electromagnetic magnetic separation rollers; the first-level non-magnetic magnetic separation sleeve (5) and the second-level non-magnetic magnetic separation sleeve (10) are respectively sleeved on the outside of the first-level electromagnetic magnetic separation roller (4) and the second-level electromagnetic magnetic separation roller (9), and are fixed on the outer shell (2) of the magnetic separator body.

3. The powder online dry magnetic separator according to claim 2, characterized in that: The auxiliary separation and sorting component comprises an impeller screw conveyor (6) for receiving powder screened by the first-stage non-magnetic magnetic separation sleeve (5), an auxiliary air blowing device (7) for blowing away the magnetic powder, and an auxiliary sorting grid and guide plate (8) for further separating the powder blown by the auxiliary air blowing device (7).

4. The powder online dry magnetic separator according to claim 3, characterized in that: The secondary non-magnetic magnetic separation casing (10) is arranged at the side and lower part of the primary non-magnetic magnetic separation casing (5); the impeller screw conveyor (6) and the auxiliary separation grid and guide plate (8) are arranged between the primary non-magnetic magnetic separation casing (5) and the secondary non-magnetic magnetic separation casing (10); the auxiliary separation grid and guide plate (8) are arranged at an angle; the auxiliary air blowing device (7) is located at the side and upper part of the auxiliary separation grid and guide plate (8), and its air outlet is arranged corresponding to the auxiliary separation grid and guide plate (8).

5. The powder online dry magnetic separator according to any one of claims 1 to 3, characterized in that: The outer sides of the primary non-magnetic conductive magnetic separation sleeve (5) and the secondary non-magnetic conductive magnetic separation sleeve (10) are both provided with a raised horizontal strip structure or a grid structure.

6. The powder online dry magnetic separator according to claim 1, characterized in that: A magnetic separator feed pipe (1), a non-magnetic powder outlet pipe (13), and a magnetic separation powder outlet pipe (12) for discharging magnetic powder after separation are provided on the magnetic separator body housing (2); a powder dispersion device (3) is provided at the connection between the magnetic separator feed pipe (1) and the magnetic separator body housing (2).

7. The powder online dry magnetic separator according to claim 2, characterized in that: The first-level electromagnetic magnetic separation roller (4) and the second-level electromagnetic magnetic separation roller (9) are provided with 6-8 groups of electromagnet monomers, and the magnetic field strength of the two is 8000GS-12000GS.

8. The powder online dry magnetic separator according to claim 1, characterized in that: Hall sensors are provided on the inner walls of the primary non-magnetic separation sleeve (5) and the secondary non-magnetic separation sleeve (10) for sensing the rotation angle of the corresponding electromagnetic roller and controlling the on and off of the single set of electromagnets to form a required working magnetic field.

9. The powder online dry magnetic separator according to claim 1, characterized in that: The first-level non-magnetic separation sleeve (5) and the second-level non-magnetic separation sleeve (10) are both provided with ultrasonic vibration devices to reduce the interaction force between moving powders on the sleeve surfaces.

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