Polluted residue soil heavy metal multi-stage magnetic separator and use method thereof

Abstract

The invention relates to the technical field of muck resourceful treatment, in particular to a contaminated muck heavy metal multistage magnetic separator and a using method thereof.The contaminated muck heavy metal multistage magnetic separator comprises a magnetic separation box and further comprises a multistage magnetic separation assembly, the multistage magnetic separation assembly comprises a plurality of conveying belts installed in the magnetic separation box, and each conveying belt is internally provided with a first magnet; the material distributing assembly comprises a material vibrating frame which is movably mounted in the conveying belt, and the material distributing assembly further comprises a material distributing frame which is mounted on the magnetic separation box; and the winnowing assembly comprises a winnowing box arranged on one side of the magnetic separation box, a flow dividing pipe is arranged above the magnetic separation box, and a cleaning frame is arranged at the bottom of the conveying belt. The material vibrating frame is arranged in the magnetic separation box to raise muck on the conveying belt, and meanwhile, the two material distributing plates are arranged in the material distributing frame to scatter the muck entering the conveying belt, so that the contact area between the muck and the conveying belt is increased, and the magnetic separation effect is improved; and meanwhile, flying dust and particles attached to the conveying belt are subjected to magnetic separation through the winnowing assembly, and the magnetic separation quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of slag resource processing, and in particular to a contaminated slag heavy metal multi-stage magnetic separator and a use method thereof. Background Art

[0002] Permanent magnetic separator is a mechanical device that separates materials based on the magnetic difference between them. The basic principle is to use the background magnetic field generated by the permanent magnet and the magnetic field gradient force generated by the magnetic medium to capture fine magnetic materials. It is one of the most widely used and versatile separation processes. In recent years, with the emergence of high-magnetic-energy-level NdFeB permanent magnets, permanent magnetic separators with compact and simple structure, low cost, low energy consumption, easy operation and maintenance, and stable operation have a broader application prospect.

[0003] The existing permanent magnetic separators have the following problems: among them, the permanent magnetic separator adopts continuous loading, and the loading position is fixed, which also leads to the subsequent magnetic separation position being fixed. Not only that, it will also cause the slag to accumulate in the magnetic separator, reducing the effect of magnetic separation; in addition, some slag with smaller particle size will adhere to the conveyor belt due to its lighter weight during the magnetic separation process, instead of being magnetically attracted and screened out. At the same time, some lighter magnetic slag will also adhere to the conveyor belt, which makes it difficult to distinguish these fine particles, and also causes a layer on the conveyor belt, reducing the effect of magnetic separation. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a contaminated slag heavy metal multi-stage magnetic separator and a method of using the same, which can effectively solve the problems in the prior art that fine particles are not easily separated by magnetic separation and slag is easy to accumulate.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a contaminated soil heavy metal multi-stage magnetic separator, comprising a magnetic separation box and further comprising: A multi-stage magnetic separation assembly comprises a plurality of conveyor belts installed in a magnetic separation box, and the conveyor belts are arranged in a stepped manner, and each of the conveyor belts is provided with a first magnet; The material separation component includes a material vibration frame movably installed in the conveyor belt. When the conveyor belt is running, the material vibration frame vibrates up and down to impact the conveyor belt. The material separation component also includes a material separation frame installed on the magnetic separation box; The air separation component comprises an air separation box arranged on one side of the magnetic separation box, a shunt pipe is arranged above the magnetic separation box, and the air separation box and the shunt pipe are connected, a cleaning rack is arranged at the bottom of the conveyor belt, and an exhaust pipe is connected between the cleaning rack and the air separation box.

[0006] Furthermore, a first material guide plate is provided in the magnetic separation box, a second material guide plate is provided on one side of each conveyor belt, a baffle is provided in the magnetic separation box, and a discharge port is opened between the baffle and the first material guide plate.

[0007] Furthermore, a transmission frame is slidably mounted on the side wall of the magnetic separation box, the transmission frame and multiple vibrating material frames move synchronously, a transmission plate is fixedly mounted on the transmission frame, a motor for driving the conveyor belt to rotate is provided on the side wall of the magnetic separation box, a cam is provided on the output shaft of the motor, and the cam is in sliding contact with the transmission plate.

[0008] Furthermore, an air collecting pipe is fixedly installed on the side wall of the magnetic separation box, a first piston tube is connected to the bottom wall of the air collecting pipe, a first piston rod is movably inserted at the bottom end of the first piston tube, the first piston rod is fixedly connected to the top wall of the transmission frame, and a return spring is provided in the first piston tube.

[0009] Furthermore, a first material distribution plate is slidably installed in the material distribution rack, a second piston tube is fixedly installed on the outer wall of one side of the material distribution rack, a second piston rod is movably inserted into one side of the second piston tube, and the second piston rod movably passes through the side wall of the material distribution rack and is fixedly connected to the first material distribution plate, and a first connecting tube is connected between the second piston tube and the gas collecting pipe.

[0010] Furthermore, a second material distribution plate is slidably installed in the material distribution rack, a third piston tube is fixedly installed on the outer wall of one side of the material distribution rack, a third piston rod is movably inserted into one side of the third piston tube, and the third piston rod movably passes through the side wall of the material distribution rack and is fixedly connected to the second material distribution plate, and a second connecting pipe is connected between the third piston tube and the gas collecting pipe.

[0011] Furthermore, a second magnet is rotatably installed in the air separation box, a recovery box is connected to one side of the air separation box, and a fan is provided on one side of the recovery box.

[0012] Furthermore, a rotating frame is rotatably installed in the wind separation box, a wind wheel is installed on the side wall of the rotating frame, and the second magnet is installed on the rotating frame.

[0013] Furthermore, a recovery port is provided on the cleaning rack, and an inner wall of the recovery port is inclined.

[0014] A method for using a contaminated soil heavy metal multi-stage magnetic separator comprises the following steps: S1: The slag is transported to the material distribution rack by an external conveying device, the slag is broken up by the first material distribution plate and the second material distribution plate in the material distribution rack, and the slag is transported by a conveyor belt and magnetically separated; S2: When the conveyor belt is transporting the slag, the conveyor belt is hit by the vibrating rack to lift the slag on the conveyor belt, so that the slag can be more fully magnetically separated; S3: The debris attached to the conveyor belt is scraped away by the cleaning rack, and the blown-up debris and the debris attached to the conveyor belt are extracted into the air separation box by the fan for magnetic separation, so as to complete the collection of the lighter debris that can be attracted by the magnet.

[0015] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: A vibrating rack is set in the magnetic separation box to lift the debris on the conveyor belt. Two dividing plates are set in the dividing rack to break up the debris entering the conveyor belt, thereby increasing the contact area between the debris and the conveyor belt and improving the magnetic separation effect. At the same time, the wind separation component is used to magnetically separate the flying dust and particles attached to the conveyor belt to improve the quality of magnetic separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is an overall schematic diagram of the present invention from a front view perspective; Figure 2 It is an overall schematic diagram of the rear view angle of the present invention; Figure 3 It is a schematic diagram of the internal structure of the magnetic separation box; Figure 4 for Figure 3 A magnified view of the structure of part A; Figure 5 for Figure 3 A magnified view of the structure of part B; Figure 6 for Figure 3 A front view of Figure 7 It is a structural schematic diagram of the vibrating material frame; Figure 8 is a front cross-sectional view of the first piston tube portion; Fig. 9 It is a structural schematic diagram of the material distribution rack part; Fig.10 It is a structural schematic diagram of the air separation box part.

[0018] The numbers in the figure represent respectively: 1, magnetic separation box; 2, conveyor belt; 3, first material guide plate; 4, second material guide plate; 5, ladder frame; 6, material distribution frame; 7, loading frame; 8, baffle; 9, motor; 10, material vibration frame; 11, transmission frame; 12, cam; 13, transmission plate; 14, air collecting pipe; 15, first piston tube; 16, first piston rod; 17, return spring; 18, first magnet; 19, first material distribution plate; 20, second material distribution plate; 21, second piston tube; 22, second piston rod; 23, first connecting pipe; 24, third piston tube; 25, third piston rod; 26, second connecting pipe; 27, air separation box; 28, recovery box; 29, fan; 30, diverter pipe; 31, suction frame; 32, cleaning frame; 33, recovery port; 34, exhaust pipe; 35, rotating frame; 36, second magnet; 37, wind wheel. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0020] The present invention will be further described below in conjunction with the embodiments.

[0021] Embodiment: A multi-stage magnetic separator for heavy metals in contaminated soil, such as Figure 1 As shown, the device includes a magnetic separation box 1, such as Figure 3 As shown, in order to improve the quality of magnetic separation, a multi-stage magnetic separation component is arranged in the magnetic separation box 1, including a plurality of conveyor belts 2 installed in the magnetic separation box 1, and the conveyor belts 2 are arranged in a stepped manner, a motor 9 for driving the conveyor belts 2 to rotate is provided on the side wall of the magnetic separation box 1, each conveyor belt 2 is provided with a first magnet 18, a first guide plate 3 is provided in the magnetic separation box 1, a second guide plate 4 is provided on one side of each conveyor belt 2, a baffle 8 is provided in the magnetic separation box 1, and a discharge port is opened between the baffle 8 and the first guide plate 3, and a ladder frame 5 is provided on the top of the magnetic separation box 1 to reduce the empty space inside, so that it is convenient to collect the flying dust generated during the magnetic separation and screening of the slag.

[0022] The top of the magnetic separation box 1 is provided with a material distribution rack 6, such as Figure 1 or Figure 2 It can be seen that a loading rack 7 is arranged above the distribution rack 6. The loading rack 7 here can be externally connected to a conveyor belt or a spiral loading rack for loading, etc., and the selection is made according to the actual type of slag and comprehensive cost.

[0023] like Figure 3As shown, multiple conveyor belts 2 are driven to rotate by a motor 9, and the slag first falls on the top conveyor belt 2 through a distribution rack 6. As the conveyor belt 2 rotates, the slag falls step by step on the conveyor belt 2 below, wherein a first magnet 18 is arranged at the rotating shaft of the conveyor belt 2. Under the magnetic attraction of the first magnet 18, some metal particles are adsorbed and transferred to the second guide plate 4, and then lose their magnetic force, and fall on the second guide plate 4 due to their own gravity, and then concentrate on the first guide plate 3 until they roll to the discharge port. A collecting device (not shown in the figure) can be arranged at the discharge port, and the specific type of collecting device is added according to actual needs.

[0024] like Figure 3 As shown, in order to prevent the accumulation of slag, a material separation component is arranged in the magnetic separation box 1, which includes a vibrating frame 10 movably installed in the conveyor belt 2. When the conveyor belt 2 is running, the vibrating frame 10 vibrates up and down to hit the conveyor belt 2. A transmission frame 11 is slidably installed on the side wall of the magnetic separation box 1. The transmission frame 11 and multiple vibrating frames 10 move synchronously. A transmission plate 13 is fixedly installed on the transmission frame 11. A cam 12 is provided on the output shaft of the motor 9. The cam 12 and the transmission plate 13 are in sliding contact. An air collecting pipe 14 is fixedly installed on the side wall of the magnetic separation box 1. A first piston tube 15 is connected to the bottom wall of the air collecting pipe 14. A first piston rod 16 is movably inserted at the bottom end of the first piston tube 15. The first piston rod 16 is fixedly connected to the top wall of the transmission frame 11. A return spring 17 is provided in the first piston tube 15. The component also includes a distribution rack 6 installed on the magnetic separation box 1, and a first distribution plate 19 is slidably installed in the distribution rack 6, a second piston tube 21 is fixedly installed on the outer wall of one side of the distribution rack 6, a second piston rod 22 is movably inserted on one side of the second piston tube 21, and the second piston rod 22 movably penetrates the side wall of the distribution rack 6 and is fixedly connected to the first distribution plate 19, a first connecting pipe 23 is connected between the second piston tube 21 and the gas collecting pipe 14, a second distribution plate 20 is slidably installed in the distribution rack 6, a third piston tube 24 is fixedly installed on the outer wall of one side of the distribution rack 6, a third piston rod 25 is movably inserted on one side of the third piston tube 24, and the third piston rod 25 movably penetrates the side wall of the distribution rack 6 and is fixedly connected to the second distribution plate 20, and a second connecting pipe 26 is connected between the third piston tube 24 and the gas collecting pipe 14.

[0025] When the conveyor belt 2 is conveying, Figure 2 As shown, one of the motors 9 also drives the cam 12 to rotate. When the cam 12 rotates, it will intermittently push up the transmission plate 13 and the transmission frame 11. When the transmission frame 11 moves up, it will drive the first piston rod 16 to move up. The first piston rod 16 moves into the first piston tube 15 and compresses the return spring 17. When the cam 12 no longer presses the transmission plate 13, the return spring 17 helps the transmission frame 11 to reset through its rebound force. The above process completes the up and down vibration of the transmission frame 11, thereby driving the up and down vibration of the vibrating frame 10. Figure 3 As shown, when the vibrating frame 10 vibrates up and down, the slag on the conveyor belt 2 will be vibrated and lifted up, thereby achieving the purpose of turning the material and improving the contact between the slag and the conveyor belt 2 more fully, which not only prevents the accumulation of slag, but also improves the magnetic separation quality of the slag.

[0026] While the material is being lifted by the vibrating frame 10, a first material dividing plate 19 and a second material dividing plate 20 are also provided in the material dividing frame 6. Figure 3 and Figure 4 As shown, a plurality of material passing gaps are provided on the first material dividing plate 19 and the second material dividing plate 20, and the material passing gaps of the first material dividing plate 19 and the second material dividing plate 20 are perpendicular to each other. Moreover, when the first piston rod 16 moves back and forth in the first piston tube 15, the air in the air collecting pipe 14 flows, thereby driving the second piston rod 22 and the third piston rod 25 to slide back and forth, thereby driving the first material dividing plate 19 and the second material dividing plate 20 to slide back and forth, further improving the effect of breaking up the slag and facilitating the subsequent magnetic separation.

[0027] The specific working steps are as follows: when the first piston rod 16 moves toward the first piston tube 15, the air in the first piston tube 15 enters the air collecting pipe 14, and under the action of air pressure, the air in the air collecting pipe 14 enters the second piston tube 21 and the third piston tube 24 respectively through the first connecting pipe 23 and the second connecting pipe 26, so that the second piston rod 22 extends out of the second piston tube 21, and the third piston rod 25 extends out of the third piston tube 24, thereby pushing the first dividing plate 19 and the second dividing plate 20 to slide; and when the first piston rod 16 moves toward the outside of the first piston tube 15, the first piston tube 15 extracts the air in the air collecting pipe 14, and under the action of air pressure, the air collecting pipe 14 extracts the air in the second piston tube 21 and the third piston tube 24 respectively through the first connecting pipe 23 and the second connecting pipe 26, so that the second piston rod 22 moves into the second piston tube 21, and the third piston rod 25 moves into the third piston tube 24, thereby pulling the first dividing plate 19 and the second dividing plate 20 to slide, achieving a good dividing effect.

[0028] In order to improve the collection and screening of fine dust, an air separation component is added to the device, including an air separation box 27 arranged on one side of the magnetic separation box 1, a shunt pipe 30 is arranged above the magnetic separation box 1, and the air separation box 27 and the shunt pipe 30 are connected, and a plurality of suction racks 31 are arranged on the ladder frame 5, and the end of the shunt pipe 30 away from the air separation box 27 is connected to the plurality of suction racks 31 one by one (such as Figure 3As shown), a cleaning rack 32 is provided at the bottom of the conveyor belt 2, and a recovery port 33 is opened on the cleaning rack 32, and the inner wall of the recovery port 33 is inclined. An exhaust pipe 34 is connected between the cleaning rack 32 and the air separation box 27, and a second magnet 36 is rotatably installed in the air separation box 27. A recovery box 28 is connected to one side of the air separation box 27. It is worth noting that the air pipe connected between the recovery box 28 and the air separation box 27 is oriented toward the non-center of the air separation box 27, so that a rotating airflow can be generated in the air separation box 27, thereby increasing the residence time of the slag and improving the quality of magnetic separation. A fan 29 is provided on one side of the recovery box 28, and a rotating rack 35 is rotatably installed in the air separation box 27. A wind wheel 37 is installed on the side wall of the rotating rack 35, and the second magnet 36 is installed on the rotating rack 35.

[0029] like Figure 1 As shown, the air in the recovery box 28 and the air separation box 27 is extracted by the fan 29, and the air separation box 27 extracts the air in the magnetic separation box 1 through the diverter pipe 30 and the exhaust pipe 34 respectively.

[0030] Among them, a suction frame 31 is provided at the end of the shunt pipe 30, such as Figure 3 As shown, the suction rack 31 is located above the conveyor belt 2. When the vibrating rack 10 lifts the material, the light slag is sucked away and enters the air separation box 27 through the shunt pipe 30. On the other hand, Figure 5 As shown, the cleaning rack 32 scrapes off the dirt attached to the conveyor belt 2, and the cleaning rack 32 is far away from the first magnet 18, which means that there is no magnetic separation at the cleaning rack 32, which means that the dirt scraped off by the cleaning rack 32 is of relatively light quality, and the dirt enters the air separation box 27 through the air extraction pipe 34, and further magnetically separates under the action of the second magnet 36. The dirt that is not magnetically separated by the second magnet 36 enters the recovery box 28.

[0031] In addition, the airflow drives the wind wheel 37 to rotate the rotating frame 35, and the rotating frame 35 drives the second magnet 36 to rotate, thereby improving the quality of magnetic separation.

[0032] A method for using a contaminated soil heavy metal multi-stage magnetic separator comprises the following steps: S1: The slag is transported to the material distribution rack 6 by an external conveying device, the slag is broken up by the first material distribution plate 19 and the second material distribution plate 20 in the material distribution rack 6, and the slag is transported by the conveyor belt 2 and magnetically separated; S2: When the conveyor belt 2 is transporting the slag, the conveyor belt 2 is impacted by the vibrating frame 10 to lift the slag on the conveyor belt 2, so as to perform more thorough magnetic separation on the slag; S3: The debris attached to the conveyor belt 2 is scraped away by the cleaning frame 32, and the blown-up debris and the debris attached to the conveyor belt 2 are extracted into the air separation box 27 by the fan 29 for magnetic separation, so as to complete the collection of the lighter debris that can be magnetically attracted.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage magnetic separator for heavy metals in contaminated soil, comprising a magnetic separation box (1), characterized in that: Also includes: A multi-stage magnetic separation assembly, comprising a plurality of conveyor belts (2) installed in a magnetic separation box (1), wherein the conveyor belts (2) are arranged in a stepped manner, and each of the conveyor belts (2) is provided with a first magnet (18); The material separation component comprises a material vibration frame (10) movably mounted in the conveyor belt (2); when the conveyor belt (2) is in operation, the material vibration frame (10) vibrates up and down to impact the conveyor belt (2); the material separation component further comprises a material separation frame (6) mounted on the magnetic separation box (1); The air separation component comprises an air separation box (27) arranged on one side of a magnetic separation box (1), a shunt pipe (30) is arranged above the magnetic separation box (1), and the air separation box (27) and the shunt pipe (30) are connected, a cleaning rack (32) is arranged at the bottom of the conveyor belt (2), and an exhaust pipe (34) is connected between the cleaning rack (32) and the air separation box (27).

2. A contaminated soil heavy metal multi-stage magnetic separator according to claim 1, characterized in that: The magnetic separation box (1) is provided with a first material guide plate (3), and each side of the conveyor belt (2) is provided with a second material guide plate (4). The magnetic separation box (1) is provided with a baffle plate (8), and a material discharge port is provided between the baffle plate (8) and the first material guide plate (3).

3. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 1, characterized in that: A transmission frame (11) is slidably mounted on the side wall of the magnetic separation box (1), the transmission frame (11) and the plurality of vibrating frames (10) move synchronously, a transmission plate (13) is fixedly mounted on the transmission frame (11), a motor (9) for driving the conveyor belt (2) to rotate is disposed on the side wall of the magnetic separation box (1), a cam (12) is disposed on the output shaft of the motor (9), and the cam (12) and the transmission plate (13) are in sliding contact.

4. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 3, characterized in that: An air collecting pipe (14) is fixedly mounted on the side wall of the magnetic separation box (1); a first piston tube (15) is connected to the bottom wall of the air collecting pipe (14); a first piston rod (16) is movably inserted into the bottom end of the first piston tube (15); the first piston rod (16) is fixedly connected to the top wall of the transmission frame (11); and a return spring (17) is provided in the first piston tube (15).

5. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 4, characterized in that: A first material distribution plate (19) is slidably mounted in the material distribution frame (6); a second piston tube (21) is fixedly mounted on an outer wall of one side of the material distribution frame (6); a second piston rod (22) is movably inserted into one side of the second piston tube (21); the second piston rod (22) movably penetrates the side wall of the material distribution frame (6) and is fixedly connected to the first material distribution plate (19); and a first connecting tube (23) is connected between the second piston tube (21) and the gas collecting pipe (14).

6. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 4, characterized in that: A second material distribution plate (20) is slidably mounted in the material distribution frame (6); a third piston tube (24) is fixedly mounted on an outer wall of one side of the material distribution frame (6); a third piston rod (25) is movably inserted into one side of the third piston tube (24); the third piston rod (25) movably penetrates the side wall of the material distribution frame (6) and is fixedly connected to the second material distribution plate (20); and a second connecting tube (26) is connected between the third piston tube (24) and the gas collecting pipe (14).

7. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 1, characterized in that: A second magnet (36) is rotatably mounted in the air separation box (27), one side of the air separation box (27) is connected to a recovery box (28), and one side of the recovery box (28) is provided with a fan (29).

8. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 7, characterized in that: A rotating frame (35) is rotatably mounted in the wind separation box (27), a wind wheel (37) is mounted on a side wall of the rotating frame (35), and the second magnet (36) is mounted on the rotating frame (35).

9. The multi-stage magnetic separator for heavy metals in contaminated soil according to claim 1, characterized in that: The cleaning frame (32) is provided with a recovery port (33), and the inner wall of the recovery port (33) is inclined.

10. A method for using the contaminated soil heavy metal multi-stage magnetic separator according to claim 1, characterized in that: The following steps are involved: S1: conveying the slag to the distribution rack (6) by means of external conveying equipment, breaking up the slag by means of a first distribution plate (19) and a second distribution plate (20) in the distribution rack (6), conveying the slag by means of a conveyor belt (2) and performing magnetic separation; S2: When the conveyor belt (2) is transporting the slag, the conveyor belt (2) is impacted by the vibrating frame (10), so that the slag on the conveyor belt (2) is lifted up, and the slag is more fully magnetically separated; S3: The debris attached to the conveyor belt (2) is scraped away by the cleaning frame (32), and the blown-up debris and the debris attached to the conveyor belt (2) are extracted by the fan (29) into the air separation box (27) for magnetic separation, thereby completing the collection of the lighter debris that can be attracted by the magnet.

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