Low-grade tin ore preparation equipment based on magnetic separation and flotation

Abstract

The low-grade tin ore preparation equipment comprises a rack, a smashing magnetic separation device and a flotation machine, the smashing magnetic separation device is installed on the rack, and the smashing magnetic separation device comprises a roller, a direct-current magnetic attraction assembly, an alternating-current demagnetization assembly, a driving mechanism and an iron collecting groove; the direct-current magnetic attraction assembly and the alternating-current demagnetizing assembly are sequentially arranged in the rotating direction of the roller, the iron collecting groove extends into the roller and is located below the alternating-current demagnetizing assembly, a plurality of grinding balls are arranged in the roller, and the diameter of each grinding ball is larger than the width of the discharging port. The direct-current magnetic attraction assembly attracts iron ore in tin ore materials to the inner wall of the roller and cannot attract the grinding balls to the inner wall of the roller, and the flotation machine is located at the discharging opening. The tin ore crushing and magnetic separation device has the beneficial effects that tin ore crushing and magnetic separation are completed in the roller, the tin ore crushing and magnetic separation efficiency is effectively improved, the advantage that the tin ore separation efficiency is high is achieved, and the tin ore crushing and magnetic separation device is particularly suitable for ore separation operation of low-grade tin ore.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing equipment, and in particular to low-grade tin ore dressing equipment based on magnetic separation and flotation. Background Art

[0002] Tin is a metal with the advantages of ductility, chemical stability, corrosion resistance and low melting point, and has a wide range of applications.

[0003] The Chinese invention patent application document with publication number CN117548225A discloses a beneficiation method of low-grade tin ore using magnetic separation and flotation. The beneficiation method of low-grade tin ore using magnetic separation and flotation comprises the following steps: step (1) crushing and grinding the low-grade tin ore, using water as a leaching agent, and performing wet magnetic separation through a magnetic separator to obtain magnetic minerals and magnetic tailings; step (2) drying the magnetic tailings after magnetic separation, placing them in a flotation agent for flotation treatment, and obtaining flotation minerals and flotation tailings; step (3) concentrating the flotation tailings after flotation treatment to obtain concentrated tailings; step (4) smelting the concentrated tailings to finally obtain tin metal, sulfides, silicates, oxides and impurities. The combination of magnetic separation and flotation improves the ore separation efficiency and recovery rate, and water is used as the leaching liquid in the magnetic separation process to reduce costs and not introduce new impurities. The flotation agent can reduce the surface tension of the tin ore and improve the leaching rate.

[0004] The Chinese utility model patent with the announcement number CN221452923U discloses a jet flotation machine for coal mine processing, including a flotation tank, a generating device installed inside the flotation tank, the generating device including a jet unit and an air intake unit, the jet unit is installed inside the flotation tank, the air intake unit is installed on the back of the flotation tank, the jet unit includes a jet pipe, a motor 1, a driven wheel, a transmission belt, a transmission wheel, a mounting cylinder, a jet head, a jet branch pipe, and a bearing, the air intake unit includes a feed box, a feed pipe, a longitudinal partition, a channel, and a vent pipe, a push unit is installed inside the flotation tank, the push unit includes a push box, a lifting device, a connecting column, and a push plate, and a discharge unit is installed on the top of the flotation tank, the discharge unit includes a motor 2, a rotating plate, a foam overflow port, and an inclined plate. The processing of coal mines is completed through the generating device.

[0005] The tin content in low-grade tin ore is relatively small, and how to improve the beneficiation efficiency of low-grade tin ore has become the key to the tin output rate of low-grade tin ore. The existing technology has the problem of low tin beneficiation efficiency. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a low-grade tin ore beneficiation equipment based on magnetic separation and flotation, which includes a frame, a crushing magnetic separation device and a flotation machine. The low-grade tin ore beneficiation equipment based on magnetic separation and flotation has the advantage of high tin ore beneficiation efficiency.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0008] A low-grade tin ore dressing equipment based on magnetic separation and flotation comprises a frame, a crushing magnetic separation device and a flotation machine, wherein the crushing magnetic separation device is mounted on the frame, the crushing magnetic separation device comprises a drum, a DC magnetic attraction component, an AC demagnetization component, a driving mechanism and an iron collecting trough, the drum is rotatably mounted on the frame, a feed port and a discharge port are arranged at both ends of the drum, the feed port is used to put tin ore materials, the driving mechanism is mounted on the frame, the driving mechanism is connected to the drum, the DC magnetic attraction component and the AC demagnetization component are arranged in sequence along the rotation direction of the drum, the AC demagnetization component is located above the drum, the iron collecting trough extends into the drum, the iron collecting trough is located below the AC demagnetization component, a plurality of grinding balls are arranged in the drum, the diameter of the grinding balls is greater than the width of the discharge port, the DC magnetic attraction component adsorbs the iron ore in the tin ore materials on the inner wall of the drum and cannot adsorb the grinding balls on the inner wall of the drum, and the flotation machine is located at the discharge port.

[0009] Through such an arrangement: the crushing and magnetic separation of tin ore are completed in the drum, so that during the crushing and magnetic separation process, there is no need to transport the tin ore between different equipment, nor is there any need to load and unload the tin ore on different equipment, which effectively improves the efficiency of tin ore crushing and magnetic separation, and achieves the advantage of higher tin ore dressing efficiency, which is especially suitable for the dressing operation of low-grade tin ore.

[0010] Preferably, the DC magnetic attraction assembly comprises a magnetic attraction bracket and a plurality of DC coils, the magnetic attraction bracket is fixedly connected to the frame, and the plurality of DC coils are mounted on the magnetic attraction bracket.

[0011] Through such an arrangement, it is possible to separate magnetic impurities from tin ore.

[0012] Preferably, the AC demagnetization component includes a demagnetization bracket, a strong AC coil and a weak AC coil. The demagnetization bracket is fixedly connected to the frame, and the strong AC coil and the weak AC coil are both installed on the demagnetization bracket. The strong AC coil is located on the side of the weak AC coil close to the DC magnetic attraction component. The strong AC coil and the weak AC coil are both used to emit an alternating magnetic field on the side wall of the drum. The intensity of the alternating magnetic field generated by the strong AC coil is greater than the intensity of the alternating magnetic field generated by the weak AC coil.

[0013] Through such an arrangement, the function of generating an alternating magnetic field on the side wall of the drum is achieved.

[0014] Preferably, the strong AC coil is provided in plurality, and the plurality of strong AC coils are arranged along the axial direction of the drum, and the weak AC coil is provided in plurality, and the plurality of weak AC coils are arranged along the axial direction of the drum.

[0015] Through such an arrangement, it is ensured that the drum side walls and magnetic impurities at different positions can be demagnetized.

[0016] Preferably, the driving mechanism comprises a first driving member, a driving gear and a driven gear, wherein the first driving member is mounted on a frame, the driving gear is rotatably connected to the frame and fixedly connected to an output shaft of the first driving member, and the driven gear is mounted on a drum and meshes with the driving gear.

[0017] Through such an arrangement, the function of the driving mechanism driving the drum to rotate is realized.

[0018] Preferably, the iron collecting trough is fixedly provided with a first water spray pipe and a second water spray pipe, wherein the first water spray pipe is located above the iron collecting trough, and the second water spray pipe is located below the iron collecting trough.

[0019] Through such an arrangement, the function of discharging the tin ore in the drum is achieved.

[0020] Preferably, two crushing and magnetic separation devices are provided in total, and the two crushing and magnetic separation devices are symmetrically arranged. A crushing gap is provided between the two drums, and a crushing convex strip is fixedly connected to the outer wall of the drum, and the crushing convex strip extends along the axial direction of the drum.

[0021] Through such setting, the function of crushing tin ore is achieved.

[0022] Preferably, the frame is equipped with a conveyor belt located below the crushing gap, and a storage box is provided below the output end of the conveyor belt.

[0023] Through such an arrangement, the crushed tin ore can be transported to a storage box as a standby tin ore material.

[0024] Preferably, the storage box is located on a side of the drum close to the feed inlet.

[0025] Such an arrangement facilitates the conveyance of the tin ore material in the storage box to the feed port of the drum.

[0026] Preferably, the flotation machine includes a flotation cell, a scraper, a second driving member, and a feed trough. The flotation cell opens upward and is located below a discharge port. The scraper is rotatably connected to the upper end of the flotation cell. The second driving member is mounted on the flotation cell and the output shaft is fixedly connected to the scraper. The feed trough is fixedly mounted on the outer side wall of the flotation cell.

[0027] Through such an arrangement, the flotation machine can realize the function of flotation of tin ore.

[0028] Compared with the prior art, the present invention has achieved beneficial technical effects:

[0029] 1. The magnetic field generated by the DC coil absorbs the magnetic impurities in the tin ore powder on the inner wall of the drum. During the rotation of the drum, the magnetic impurities are driven to move toward the AC demagnetization component by friction. The strong AC coil and the weak AC coil generate an alternating magnetic field at the magnetic impurities and the side wall of the drum at the magnetic impurities. The strong AC coil is used to change the magnetic moment direction of the magnetic domain of the magnetic impurities and the drum at the magnetic impurities, and then the weak AC coil is used to weaken the magnetization intensity of the magnetic impurities and the drum at the magnetic impurities, so as to achieve the effect of demagnetizing the magnetic impurities, so that the magnetic impurities fall from the position close to the AC demagnetization component to the iron collecting trough. The iron-free tin ore powder cannot be absorbed by the DC magnetic suction component on the side wall of the drum and continues to roll at the bottom of the drum, thereby realizing the function of magnetic separation of tin ore.

[0030] 2. The crushing and magnetic separation of tin ore are completed in the drum, so that the tin ore does not need to be transported between different equipment during the crushing and magnetic separation process, nor does it need to be loaded and unloaded on different equipment. The efficiency of tin ore crushing and magnetic separation is effectively improved, achieving the advantage of high tin ore dressing efficiency, which is especially suitable for the dressing operation of low-grade tin ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a low-grade tin ore dressing equipment based on magnetic separation and flotation in an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of a conveyor belt and a storage box in an embodiment of the present invention;

[0033] Figure 3 is a cross-sectional view of a drum in an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of a DC magnetic attraction component and an AC demagnetization component in an embodiment of the present invention.

[0035] The technical features indicated by the reference numerals are as follows:

[0036] 10. Frame; 11. Crushing and magnetic separation device; 12. Drum; 13. Feed inlet; 14. Discharge outlet; 15. Crushing gap; 16. Conveyor belt; 17. Storage box; 18. Crushing convex strip; 21. Iron collecting trough; 22. First water spray pipe; 23. Second water spray pipe; 24. Baffle; 31. Magnetic bracket; 32. DC coil; 33. Demagnetization bracket; 34. Strong AC coil; 35. Weak AC coil; 41. First driving member; 42. Driving gear; 43. Driven gear; 51. Flotation tank; 52. Scraper; 53. Second driving member; 54. Feeding trough; 61. Grinding ball; 62. Lead core; 63. Wear-resistant layer. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments, but the scope of protection claimed in the present invention is not limited to the following specific embodiments.

[0038] refer to Figure 1-4 A low-grade tin ore dressing equipment based on magnetic separation and flotation includes a frame 10, a crushing magnetic separation device 11 and a flotation machine, wherein the crushing magnetic separation device 11 is installed on the frame 10.

[0039] The crushing magnetic separation device 11 includes a drum 12, a DC magnetic attraction component, an AC demagnetization component, a driving mechanism and an iron collecting trough 21. The drum 12 is rotatably mounted on the frame 10. The driving mechanism is mounted on the frame 10, and the driving mechanism is connected to the drum 12. The driving mechanism includes a first driving member 41, a driving gear 42, and a driven gear 43. The first driving member 41 is mounted on the frame 10, and the driving gear 42 is rotatably connected to the frame 10 and fixedly connected to the output shaft of the first driving member 41. The driven gear 43 is mounted on the drum 12 and meshes with the driving gear 42. The first driving member 41 is a reduction motor. The first driving member 41 drives the drum 12 to rotate on the frame 10 through the driving gear 42 and the driven gear 43, thereby realizing the function of the driving mechanism driving the drum 12 to rotate.

[0040] The two ends of the drum 12 are provided with a feed port 13 and a discharge port 14. The feed port 13 is used to put in tin ore materials, and the discharge port 14 is used to discharge materials. A total of two crushing and magnetic separation devices 11 are provided, and the two crushing and magnetic separation devices 11 are symmetrically arranged. A crushing gap 15 is provided between the two drums 12, and a crushing convex strip 18 is fixedly connected to the outer wall of the drum 12, and the crushing convex strip 18 extends along the axial direction of the drum 12. The two crushing and magnetic separation devices 11 crush and magnetically separate the tin ore at the same time, which plays a role in improving production efficiency. The two drums 12 on both sides of the crushing gap 15 rotate in opposite directions, and the side wall of the drum 12 close to the crushing gap 15 turns downward. Put the tin ore with a larger width on the crushing gap 15, and the drum 12 drives the crushing convex strip 18 to crush the tin ore on the crushing gap 15, so as to realize the function of crushing the tin ore. The frame 10 is equipped with a conveyor belt 16 located below the crushing gap 15, and a storage box 17 is provided below the output end of the conveyor belt 16. After the width of the tin ore at the crushing gap 15 is smaller than the width of the crushing gap 15, the tin ore falls onto the conveyor belt 16 below the crushing gap 15, and the conveyor belt 16 conveys the crushed tin ore to the storage box 17 for standby use as tin ore material. The storage box 17 is located on the side of the drum 12 close to the feed port 13. It facilitates the conveyance of the tin ore material in the storage box 17 to the feed port 13 of the drum 12.

[0041] A plurality of grinding balls 61 are arranged in the drum 12, and the diameter of the grinding balls 61 is larger than the width of the discharge port 14. The grinding balls 61 are provided with a lead core 62 and a wear-resistant layer 63, the lead core 62 is located in the wear-resistant layer 63, the lead core 62 is made of lead, and the wear-resistant layer 63 is made of steel. The lead is arranged in the grinding balls 61, which can reduce the attraction of the magnetic field to the grinding balls 61, thereby preventing the grinding balls 61 from being adsorbed on the side wall of the drum 12 by the DC magnetic attraction component.

[0042] The DC magnetic attraction component and the AC demagnetization component are arranged in sequence along the rotation direction of the drum 12. The AC demagnetization component is located above the drum 12. The iron collecting trough 21 extends into the drum 12. The iron collecting trough 21 is located below the AC demagnetization component. The DC magnetic attraction component adsorbs the iron ore in the tin mineral material on the inner wall of the drum 12 and cannot adsorb the grinding balls 61 on the inner wall of the drum 12. The flotation machine is located at the discharge port 14.

[0043] The DC magnetic attraction assembly includes a magnetic attraction bracket 31 and a plurality of DC coils 32. The magnetic attraction bracket 31 is fixedly connected to the frame 10, and the plurality of DC coils 32 are mounted on the magnetic attraction bracket 31. Direct current is supplied to the DC coil 32, so that the DC coil 32 generates a magnetic field at the side wall of the drum 12, and the magnetic impurities are adsorbed on the surface of the drum 12 by the magnetic field generated by the DC coil 32. The magnetic impurities move with the rotation of the drum 12, so that the magnetic impurities are separated from the tin ore.

[0044] The AC demagnetization component includes a demagnetization bracket 33, a strong AC coil 34 and a weak AC coil 35. The demagnetization bracket 33 is fixedly connected to the frame 10. The strong AC coil 34 and the weak AC coil 35 are both installed on the demagnetization bracket 33. The strong AC coil 34 is located on the side of the weak AC coil 35 close to the DC magnetic attraction component. The strong AC coil 34 and the weak AC coil 35 are both used to emit an alternating magnetic field on the side wall of the drum 12. The intensity of the alternating magnetic field generated by the strong AC coil 34 is greater than the intensity of the alternating magnetic field generated by the weak AC coil 35. The function of generating an alternating magnetic field on the side wall of the drum 12 is realized. A plurality of strong AC coils 34 are provided, and the plurality of strong AC coils 34 are arranged along the axial direction of the drum 12. A plurality of weak AC coils 35 are provided, and the plurality of weak AC coils 35 are arranged along the axial direction of the drum 12. Multiple strong AC coils 34 and multiple weak AC coils 35 are arranged along the axial direction of the drum 12, so that the multiple strong AC coils 34 and multiple weak AC coils 35 can cover different positions of the drum 12, ensuring that the side walls of the drum 12 and magnetic impurities at different positions can be demagnetized.

[0045] The iron collecting trough 21 is fixedly provided with a first water spray pipe 22 and a second water spray pipe 23, wherein the first water spray pipe 22 is located above the iron collecting trough 21, and the second water spray pipe 23 is located below the iron collecting trough 21. Both the first water spray pipe 22 and the second water spray pipe 23 are connected to an external water source. The first water spray pipe 22 sprays water into the iron collecting trough 21, and the magnetic impurities in the iron collecting trough 21 are flushed to the outside of the iron collecting trough 21 by the water flow, thereby realizing the function of discharging the impurities in the iron collecting trough 21. When the tin ore in the drum 12 needs to be discharged, the second water spray pipe 23 sprays water into the drum 12, and the tin ore is flushed to the outside of the drum 12 through the discharge port 14 by the water flow, thereby realizing the function of discharging the tin ore in the drum 12.

[0046] The drum 12 is detachably provided with a baffle 24 for blocking the discharge port 14. When the tin ore is crushed and magnetically separated, the baffle 24 is installed on the drum 12, and the tin ore is blocked by the baffle 24 so that the tin ore is retained in the drum 12. When the tin ore in the drum 12 needs to be discharged, the baffle 24 is disassembled from the discharge port 14, so that the tin ore can be discharged from the discharge port 14.

[0047] The flotation machine includes a flotation tank 51, a scraper 52, a second driving member 53, and a feeding trough 54. The flotation tank 51 opens upward and is located below the discharge port 14. The scraper 52 is rotatably connected to the upper end of the flotation tank 51. The second driving member 53 is installed on the flotation tank 51 and the output shaft is fixedly connected to the scraper 52. The feeding trough 54 is fixedly installed on the outer wall of the flotation tank 51. The second driving member 53 is a reduction motor.

[0048] The tin ore material is put into the drum 12 through the feed port 13, and the driving mechanism drives the drum 12 to rotate at a speed of 30 to 80 r / min on the frame 10, so that the tin ore material and the grinding balls 61 roll and collide in the drum 12, so that the tin ore material can be ground by the grinding balls 61 to obtain tin ore powder. Then the driving mechanism drives the drum 12 to rotate at a speed of 5 to 20 r / min on the frame 10, and respectively passes direct current, strong alternating current and weak alternating current into the DC coil 32, the strong alternating current coil 34 and the weak alternating current coil 35, and the current of the strong alternating current is greater than the current of the weak alternating current, so that the DC coil 32, the strong alternating current coil 34 and the weak alternating current coil 35 generate magnetic fields respectively. The magnetic field generated by the DC coil 32 adsorbs the magnetic impurities in the tin ore powder on the inner wall of the drum 12. The drum 12 drives the magnetic impurities to move toward the AC demagnetization component through friction during rotation. The strong AC coil 34 and the weak AC coil 35 generate an alternating magnetic field at the magnetic impurities and the side wall of the drum 12 at the magnetic impurities. The strong AC coil 34 first changes the magnetic moment direction of the magnetic domain of the magnetic impurities and the drum 12 at the magnetic impurities, and then the weak AC coil 35 weakens the magnetization intensity of the magnetic impurities and the drum 12 at the magnetic impurities, so as to achieve the effect of demagnetizing the magnetic impurities, so that the magnetic impurities fall downward from the position close to the AC demagnetization component into the iron collecting tank 21, and the iron-free tin ore powder cannot be adsorbed on the side wall of the drum 12 by the DC magnetic attraction component and continues to roll at the bottom of the drum 12, realizing the function of magnetic separation of the tin ore. The tin ore powder after magnetic separation is sent to the flotation machine through the discharge port 14, and the tin ore powder is floated by the flotation machine to realize the function of ore dressing of the tin ore.

[0049] The tin ore powder in the drum 12 is discharged downward into the flotation tank 51 through the discharge port 14. A flotation machine is added to the flotation tank 51, and then gas is introduced into the bottom of the flotation tank 51 to make the flotation agent generate foam that moves upward. By utilizing the different hydrophilicity differences between the flotation machine, the tin ore, and the impurities in the tin ore, the tin ore can move upward with the foam while the impurities sink to the bottom of the flotation tank 51. Then, the scraper 52 is driven to rotate by the second driving member 53. During the rotation process, the scraper 52 scrapes the tin ore that moves to the top of the flotation tank 51 with the foam onto the feed trough 54, so that the tin ore can be discharged through the feed trough 54, thereby realizing the function of the flotation machine to float the tin ore.

[0050] This embodiment has the following advantages:

[0051] By completing the crushing and magnetic separation of the tin ore in the drum 12, there is no need to transport the tin ore between different devices during the crushing and magnetic separation process, nor is there any need to load and unload the tin ore on different devices, which effectively improves the efficiency of the crushing and magnetic separation of the tin ore, achieves the advantage of high tin ore beneficiation efficiency, and is particularly suitable for the beneficiation operation of low-grade tin ore.

[0052] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the invention.

Claims

1. A low-grade tin ore dressing equipment based on magnetic separation and flotation, characterized in that: The invention comprises a frame (10), a crushing magnetic separation device (11) and a flotation machine, wherein the crushing magnetic separation device (11) is mounted on the frame (10), the crushing magnetic separation device (11) comprises a roller (12), a DC magnetic attraction component, an AC demagnetization component, a driving mechanism and an iron collecting trough (21), the roller (12) is rotatably mounted on the frame (10), a feed port (13) and a discharge port (14) are provided at both ends of the roller (12), the feed port (13) is used to place tin mineral material, the driving mechanism is mounted on the frame (10), the driving mechanism is connected to the roller (12), and the The DC magnetic attraction component and the AC demagnetization component are arranged in sequence along the rotation direction of the drum (12); the AC demagnetization component is located above the drum (12); the iron collecting trough (21) extends into the drum (12); the iron collecting trough (21) is located below the AC demagnetization component; a plurality of grinding balls (61) are arranged in the drum (12); the diameter of the grinding balls (61) is greater than the width of the discharge port (14); the DC magnetic attraction component adsorbs the iron ore in the tin mineral material onto the inner wall of the drum (12) and cannot adsorb the grinding balls (61) onto the inner wall of the drum (12); and the flotation machine is located at the discharge port (14).

2. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1 is characterized in that: The DC magnetic attraction component comprises a magnetic attraction bracket (31) and a plurality of DC coils (32); the magnetic attraction bracket (31) is fixedly connected to the frame (10); and the plurality of DC coils (32) are mounted on the magnetic attraction bracket (31).

3. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1 is characterized in that: The AC demagnetization component comprises a demagnetization bracket (33), a strong AC coil (34) and a weak AC coil (35); the demagnetization bracket (33) is fixedly connected to the frame (10); the strong AC coil (34) and the weak AC coil (35) are both mounted on the demagnetization bracket (33); the strong AC coil (34) is located on a side of the weak AC coil (35) close to the DC magnetic attraction component; the strong AC coil (34) and the weak AC coil (35) are both used to emit an alternating magnetic field on the side wall of the drum (12); the intensity of the alternating magnetic field generated by the strong AC coil (34) is greater than the intensity of the alternating magnetic field generated by the weak AC coil (35).

4. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 3 is characterized in that: The strong AC coil (34) is provided in plurality, and the plurality of strong AC coils (34) are arranged along the axial direction of the drum (12); the weak AC coil (35) is provided in plurality, and the plurality of weak AC coils (35) are arranged along the axial direction of the drum (12).

5. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1 is characterized in that: The driving mechanism comprises a first driving member (41), a driving gear (42), and a driven gear (43); the first driving member (41) is mounted on a frame (10); the driving gear (42) is rotatably connected to the frame (10) and fixedly connected to an output shaft of the first driving member (41); and the driven gear (43) is fixedly mounted on a roller (12) and meshes with the driving gear (42).

6. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1 is characterized in that: The iron collecting trough (21) is fixedly provided with a first water spray pipe (22) and a second water spray pipe (23), wherein the first water spray pipe (22) is located above the iron collecting trough (21), and the second water spray pipe (23) is located below the iron collecting trough (21).

7. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1 is characterized in that: A total of two crushing and magnetic separation devices (11) are provided, and the two crushing and magnetic separation devices (11) are symmetrically arranged. A crushing gap (15) is provided between the two rollers (12). A crushing convex strip (18) is fixedly connected to the outer wall of the roller (12), and the crushing convex strip (18) extends along the axial direction of the roller (12).

8. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 7 is characterized in that: The frame (10) is provided with a conveyor belt (16) located below the crushing gap (15), and a storage box (17) is provided below the output end of the conveyor belt (16).

9. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 8, characterized in that: The storage box (17) is located on a side of the drum (12) close to the feed port (13).

10. The low-grade tin ore dressing equipment based on magnetic separation and flotation according to claim 1, characterized in that: The flotation machine comprises a flotation tank (51), a scraper (52), a second driving member (53), and a feeding trough (54); the flotation tank (51) opens upward and is located below a discharge port (14); the scraper (52) is rotatably connected to the upper end of the flotation tank (51); the second driving member (53) is mounted on the flotation tank (51) and the output shaft is fixedly connected to the scraper (52); and the feeding trough (54) is fixedly mounted on the outer side wall of the flotation tank (51).

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