Low-grade ore screening device and screening method thereof

Abstract

The invention relates to the technical field of mining screening devices, and discloses a low-grade ore screening device and a screening method.The low-grade ore screening device comprises a rack and an exciting coil, the exciting coil is arranged at the top of the rack, upper supports are arranged at the positions, located on the outer side of the exciting coil, of the top of the rack, and a main shaft is arranged between the tops of the upper supports; a rotating ring sorting chamber is arranged on the outer wall of the main shaft, a discharging groove is formed in the position, located below the rotating ring sorting chamber, of the top of the rack, a discharging groove is formed in the position, located in the rotating ring sorting chamber, of the middle of the upper support, an upper support supporting plate is arranged in the position, located above the discharging groove, of the middle of the upper support, and a feeding shell is arranged on one side of the top of the upper support supporting plate. In the rotating process of the rotating ring separation chamber, the bottom of the separation chamber can make contact with the elastic scraping plate, large-particle minerals at the bottom of the separation chamber are scraped, large-particle impurities in the minerals are prevented from blocking filtering holes of the separation chamber, and the magnetic separation device is prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of mining screening devices, in particular to a low-grade ore screening device and a screening method thereof. Background Art

[0002] Low-grade ores usually contain a variety of mineral components. The interaction between these components makes the beneficiation process complicated. Since the metal content in low-grade ores is low, the content of other useless components or impurities is correspondingly high. In order to improve the utilization rate of low-grade ores, a variety of useful components in the ore can be separated and extracted through screening devices to separate valuable minerals.

[0003] For example, the existing Chinese patent (CN204448258U) discloses a beneficiation device for ultra-low-grade vanadium-titanium magnetite. The feeder continuously transports the ore to the ore crusher, and the ore crusher crushes the ore into ore with a diameter of less than 12 mm. After crushing, the ore is put into the first-stage grinding and classification device for grinding, and the ore fineness reaches -200 mesh, accounting for 45%. The ore sand is screened out by a cylindrical screen to remove the coarse slag with a diameter greater than 1.5 mm. The coarse slag returns to the first-stage grinding and classification device for grinding. After the coarse slag is screened out, the ore sand passes through a disc magnetic separator and a high-gradient pulsating strong magnetic machine in turn. The disc magnetic separator is used for iron removal, and the high-gradient pulsating strong magnetic machine is used for rough selection of ilmenite; the coarse iron concentrate obtained by the disc magnetic separator and the strong magnetic coarse concentrate obtained by the high-gradient pulsating strong magnetic machine are mixed in a first-stage mixing device. The mixture of the two is successively ground by the second-stage grinding and classification device and the third-stage grinding and classification device, so that the fineness of the mixture reaches -200 mesh, accounting for more than 95%. The mixture after grinding passes through the first stage of the drum weak magnetic separator and the drum medium magnetic separator in turn. The magnetic minerals obtained from the first stage of the drum weak magnetic separator and the drum medium magnetic separator are mixed in the second stage mixing device. The mixed magnetic minerals are re-grinded by the four-stage grinding and classification device. The re-ground magnetic minerals enter the second stage of the drum weak magnetic separator and the third stage of the drum weak magnetic separator in turn, and after being refined, the final iron concentrate is obtained.

[0004] The above technical solution adopts high-gradient strong-stimulation magnetic separation of mineral materials. However, during the magnetic separation process of the existing high-gradient magnetic separator, the particles will be affected by multiple forces such as magnetic force, fluid drag, gravity, etc. The combined effect of these forces causes the movement trajectory of the particles in the sorting chamber to be complex and changeable. Gangue and conjoined particles are easily absorbed on the surface of the accumulation body. As the magnetic separation process proceeds, the sorting chamber is easily blocked. Summary of the invention

[0005] The object of the present invention is to provide a low-grade ore screening device and a screening method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a low-grade ore screening device, comprising: a frame and an excitation coil, the frame top is provided with an excitation coil, the frame top is provided with an upper bracket outside the excitation coil, a main shaft is provided between the tops of the upper brackets, a swivel sorting chamber is provided on the outer wall of the main shaft, a discharge chute is provided on the frame top below the swivel sorting chamber, a discharge chute is provided in the middle of the upper bracket inside the swivel sorting chamber, an upper bracket support plate is provided in the middle of the upper bracket above the discharge chute, a feed shell is provided on one side of the top of the upper bracket support plate, an upper receiving shell is provided on the top of the upper bracket support plate above the feed shell, a first discharge hopper is provided at the bottom of the discharge chute, a second discharge hopper is provided on one side of the outer wall of the discharge chute, a main motor is provided on one side of the top of the upper bracket, one end of the output shaft of the main motor is fixed to the main shaft, the discharge chute is arranged vertically and equidistantly, an elastic scraper is provided at the interval on the top of the discharge chute, and an elastic support pad is provided on one side of the bottom of the elastic scraper.

[0007] Preferably, a pulse mechanism housing is provided on one side of the frame, a transmission shaft is provided on one side inside the pulse mechanism housing, an eccentric swing arm is provided on the outer wall of the transmission shaft, a sliding shaft is provided inside one end of the eccentric swing arm, a pulse shaft is provided on the outer wall of one end of the eccentric swing arm, a pulse sleeve is provided on one end of the pulse shaft, and one end of the pulse sleeve is fixedly connected to the first unloading hopper.

[0008] Preferably, a driving gear is fixed to one end of the main motor output shaft, and a driven gear is fixed to one end of the main shaft, and the driving gear is meshed with the driven gear.

[0009] Preferably, a water pipe bracket is provided at the top of the upper bracket outside the rotating ring sorting chamber, a flushing water pipe is provided inside the water pipe bracket, and a water outlet is provided at the bottom of the flushing water pipe.

[0010] Preferably, there are a plurality of rotating ring sorting chambers, and partitions are provided between the plurality of rotating ring sorting chambers.

[0011] Preferably, a pulse mechanism driving motor is provided on one side of the frame, and a belt transmission mechanism is provided between the pulse mechanism driving motor and the transmission shaft.

[0012] Preferably, the elastic scraper is made of an elastic steel plate, and the top end of the elastic scraper is in contact with an outer wall of one side of the rotating ring sorting chamber.

[0013] A low-grade ore screening method comprises a low-grade ore screening device.

[0014] Preferably, a low-grade ore screening method comprises the following steps: S1: Crushing: Use a jaw crusher to initially crush the large ore, and then use a cone crusher for fine crushing until the required particle size is reached; S2: Screening: the crushed iron ore is screened through a vibrating screen to obtain iron ore particles of different sizes; S3: Grinding: the fine iron ore after screening enters the ball mill for grinding until it reaches the required fineness; S4: Wet magnetic separation: the iron ore slurry after grinding enters the magnetic separator, and the magnetic iron minerals are separated by the action of the magnetic field to obtain iron ore concentrate; S5: Flotation. The tailings after magnetic separation enter the flotation machine, and an appropriate amount of flotation reagent is added. The non-magnetic minerals are floated by stirring and aeration to achieve separation. S6: Gravity separation: the tailings or other minerals that need to be re-selected after flotation enter the spiral chute or jig to achieve separation through gravity; S7: Dehydration: Dehydration of the concentrate after gravity separation is carried out through a dehydration screen.

[0015] Preferably, during the screening process, the parameters of feed rate, water feed rate and reagent addition rate are monitored in real time; according to the monitoring results and the mineral processing effect, the process parameters are adjusted in time to ensure the stable operation of the mineral processing process.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes that when screening low-grade ores, the large ore is initially crushed by a jaw crusher, and then finely crushed by a cone crusher until the required particle size is reached; the crushed iron ore is screened by a vibrating screen to obtain iron ore particles of different particle sizes; the fine iron ore after screening enters a ball mill for grinding until the required fineness is reached; the iron ore slurry after grinding enters a magnetic separator, and the magnetic iron minerals are separated by the action of a magnetic field to obtain an iron ore concentrate; the tailings after magnetic separation enter a flotation machine, and a proper amount of flotation reagent is added, and non-magnetic minerals are floated by stirring and aeration to achieve separation; the tailings after flotation or other minerals that need to be re-selected enter a spiral chute or a jig, and are separated by gravity; the re-selected concentrate is dehydrated by a dewatering screen; In the magnetic separation process, a magnetic field is generated by an exciting coil, and the ore pulp is transported to the feed shell through a pipeline and enters the separation area through the discharge trough of the magnetic pole. When the magnetic particles in the ore pulp enter the magnetic field, they will be adsorbed to the surface of the magnetic medium by the magnetic field force. Since the magnetic force on the non-magnetic particles is extremely weak and smaller than the combined force of fluid power and gravity, they will break away from the surface of the magnetic medium and enter the first discharge hopper from the lower magnetic pole discharge trough through the gaps between the magnetic media to become tailings. The magnetic particles adsorbed on the surface of the magnetic medium continue to move with the rotation of the rotating ring until they gradually break away from the magnetic field area and enter the top non-magnetic area, where they will be flushed into the upper receiving shell by flushing water to become magnetic products. During the rotation of the rotating ring sorting chamber, the bottom of the sorting chamber will contact the elastic scraper to scrape the large particles of minerals at the bottom of the sorting chamber to prevent large particles of impurities in the minerals from clogging the filter holes of the sorting chamber and clogging the magnetic separation device.

[0017] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a low-grade ore screening device according to the present invention; Figure 2 It is a main cross-sectional view of a low-grade ore screening device of the present invention; Figure 3 for Figure 2 The enlarged structural diagram at A in the middle; Figure 4 A three-dimensional diagram of a low-grade ore screening device of the present invention from another perspective; Figure 5 A three-dimensional diagram of a low-grade ore screening device of the present invention from another perspective; Figure 6 This is a front view of a low-grade ore screening device of the present invention; Figure 7 It is a left view of a low-grade ore screening device of the present invention; Figure 8 It is a right view of a low-grade ore screening device of the present invention; Fig. 9 A top view of a low-grade ore screening device according to the present invention; Fig.10 A half-section diagram of a low-grade ore screening device of the present invention; Fig.11 The present invention is a flow chart of a low-grade ore screening method.

[0019] In the figure: 1. frame; 2. exciting coil; 3. upper bracket; 4. main motor; 5. driving gear; 6. driven gear; 7. main shaft; 8. rotating ring sorting chamber; 9. partition; 10. water pipe bracket; 11. flushing water pipe; 12. upper bracket support plate; 13. upper receiving shell; 14. feed shell; 15. first discharge hopper; 16. pulse sleeve; 17. pulse shaft; 18. pulse mechanism shell; 19. pulse mechanism driving motor; 20. belt transmission mechanism; 21. transmission shaft; 22. eccentric swing arm; 23. sliding shaft; 24. discharge chute; 25. discharge chute; 26. elastic scraper; 27. elastic support pad; 28. second discharge hopper. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1: Please refer to Figure 1-Figure 3 The present invention provides a technical solution: a low-grade ore screening device, comprising: a frame 1 and an excitation coil 2, the frame 1 is provided with an excitation coil 2 on the top, an upper bracket 3 is provided on the top of the frame 1 and located outside the excitation coil 2, a main shaft 7 is provided between the tops of the upper brackets 3, and a rotating ring sorting chamber 8 is provided on the outer wall of the main shaft 7. During the magnetic separation process, a magnetic field is generated by the excitation coil 2, and the ore slurry is transported to the feed shell 14 through a pipeline and enters the sorting area through the discharge trough 24 of the magnetic pole. When the magnetic particles in the ore slurry enter the magnetic field, they will be adsorbed onto the surface of the magnetic medium by the action of the magnetic field force.

[0022] The top of the frame 1 is located below the rotating ring sorting chamber 8 and is provided with a discharge trough 25. The middle of the upper bracket 3 is located inside the rotating ring sorting chamber 8 and is provided with a discharge trough 24. The middle of the upper bracket 3 is located above the discharge trough 24 and is provided with an upper bracket support plate 12. A feed shell 14 is provided on one side of the top of the upper bracket support plate 12. An upper receiving shell 13 is provided above the feed shell 14 at the top of the upper bracket support plate 12. A first discharge hopper 15 is provided at the bottom of the discharge trough 25. During the magnetic separation process, a magnetic field is generated by the excitation coil 2, and the slurry is transported to the feed shell 14 through a pipeline, and enters the separation area through the discharge trough 24 of the magnetic pole. When the magnetic particles in the ore pulp enter the magnetic field, they will be attracted to the surface of the magnetic medium by the magnetic force. Since the magnetic force on the non-magnetic particles is extremely weak and smaller than the combined force of the fluid dynamics and gravity, they will break away from the surface of the magnetic medium and enter the first discharge hopper 15 from the lower magnetic pole discharge trough 25 through the gaps between the magnetic media to become tailings. The magnetic particles attracted to the surface of the magnetic medium continue to move with the rotation of the rotating ring until they gradually break away from the magnetic field area and enter the top non-magnetic area, where they will be flushed into the upper receiving shell 13 by flushing water to become magnetic products. A second discharge hopper 28 is provided on one side of the outer wall of the discharge chute 25, and water and other impurities enter the second discharge hopper 28. A main motor 4 is provided on one side of the top of the upper bracket 3, and one end of the output shaft of the main motor 4 is fixed to the main shaft 7. The discharge chute 25 is arranged vertically and equidistantly, and an elastic scraper 26 is provided at the interval of the top of the discharge chute 25, and an elastic support pad 27 is provided on one side of the bottom of the elastic scraper 26. The elastic scraper 26 is made of elastic steel plate, and the top of the elastic scraper 26 abuts against the outer wall of one side of the rotating ring sorting chamber 8.

[0023] During the rotation of the rotating ring separation chamber 8, the bottom of the separation chamber will contact the elastic scraper 26 to scrape the large particles of minerals at the bottom of the separation chamber to prevent large particles of impurities in the minerals from clogging the filter holes of the separation chamber and clogging the magnetic separation device.

[0024] Example 2: Please refer to Figure 1-Figure 10 The present invention provides a technical solution: a low-grade ore screening device, which is further compared with the embodiment 1 in that: a pulse mechanism housing 18 is provided on one side of the frame 1, a transmission shaft 21 is provided on one side of the pulse mechanism housing 18, an eccentric swing arm 22 is provided on the outer wall of the transmission shaft 21, a sliding shaft 23 is provided inside one end of the eccentric swing arm 22, a pulse shaft 17 is provided on the outer wall of one end of the eccentric swing arm 22, a pulse sleeve 16 is provided on one end of the pulse shaft 17, and one end of the pulse sleeve 16 is fixedly connected to the first discharge hopper 15. A pulse mechanism driving motor 19 is provided on one side of the frame 1, and a belt transmission mechanism 20 is provided between the pulse mechanism driving motor 19 and the transmission shaft 21. The pulse mechanism driving motor 19 cooperates with the belt transmission mechanism 20 to drive the transmission shaft 21 to rotate, thereby driving the eccentric swing arm 22 to swing, and the swing of the eccentric swing arm 22 is converted into a linear reciprocating motion through the sliding shaft 17, driving the pulse shaft 17 and the pulse sleeve 16 to pulse the slurry in the first discharge hopper 15, and the slurry will then reciprocate up and down. This pulsating fluid keeps the ore particles in a loose state during the sorting process, thereby effectively eliminating the mechanical inclusions of non-magnetic particles. It prevents them from agglomerating due to gravity or magnetic force. This loose state is conducive to better contact between magnetic particles and magnetic media, improving the capture rate. Under the action of pulsating fluid force, non-magnetic particles are more likely to fall off from the magnetic particle clusters, reducing mechanical inclusions and thus improving the grade of magnetic concentrate. The pulsating mechanism can also effectively prevent the blockage of magnetic media and separation channels. Since the ore particles in the slurry are in a loose state, they are more likely to pass through the magnetic medium pile and separation channels, reducing the risk of blockage.

[0025] A driving gear 5 is fixed to one end of the output shaft of the main motor 4, and a driven gear 6 is fixed to one end of the main shaft 7, and the driving gear 5 meshes with the driven gear 6. When the main motor 4 is started, its output shaft starts to rotate. The rotating output shaft drives the driving gear 5 to rotate. The driving gear 5 meshes with the driven gear 6, so the driven gear also starts to rotate. The rotation of the driven gear drives the main shaft 7 to rotate. The rotation of the main shaft then drives the swivel connected thereto to rotate.

[0026] A water pipe support 10 is provided at the top of the upper bracket 3, located outside the rotating ring sorting chamber 8, a flushing water pipe 11 is provided inside the water pipe support 10, and a water outlet is provided at the bottom of the flushing water pipe 11. There are several rotating ring sorting chambers 8, and partitions 9 are provided between the several rotating ring sorting chambers 8. The upper bracket 3 supports the water pipe support 10, and the rotating ring sorting chamber 8 is divided into multiple independent separation areas by the partitions 9. The water pipe support 10 supports the flushing water pipe 11 to ensure that the flushing water can be accurately transported to the appropriate position of the rotating ring sorting chamber. The flushing water pipe 11 provides flushing water to the rotating ring sorting chamber through the water outlet at its bottom to help separate and clean the magnetic material.

[0027] Example 3: Please refer to Fig.11 The present invention provides a technical solution: a low-grade ore screening device and a low-grade ore screening method, including a low-grade ore screening device. A low-grade ore screening method comprises the following steps: S1: Crushing: Use a jaw crusher to preliminarily crush large pieces of ore, and then use a cone crusher for fine crushing until the required particle size is reached; Use a jaw crusher to coarsely crush large pieces of ore. The jaw crusher crushes the ore through the squeezing action of two jaw plates. After the preliminary crushing, the ore enters the cone crusher for fine crushing. The cone crusher further crushes the ore to the required particle size through the squeezing and shearing action between the rotating cone and the fixed liner; S2: Screening: The crushed iron ore is screened by a vibrating screen to obtain iron ore particles of different sizes. The crushed iron ore is screened by a vibrating screen, which makes the ore particles jump and roll on the screen surface through vibration, thereby achieving classification by particle size. S3: Grinding: the fine iron ore after screening enters the ball mill for grinding until it reaches the required fineness; the fine iron ore after screening is sent to the ball mill for grinding. The ball mill impacts and grinds the ore through the rotating cylinder and the steel balls inside, thereby achieving fine grinding; S4: Wet magnetic separation: the iron ore slurry after grinding enters the magnetic separator, and the magnetic iron minerals are separated by the action of the magnetic field to obtain iron ore concentrate; The magnetic field is generated by the exciting coil 2, and the ore pulp is transported to the feed shell 14 through the pipeline, and enters the separation area through the discharge trough 24 of the magnetic pole. When the magnetic particles in the ore pulp enter the magnetic field, they will be adsorbed to the surface of the magnetic medium by the magnetic force. Since the magnetic force on the non-magnetic particles is extremely weak, which is smaller than the combined force of the fluid dynamics and gravity, they will break away from the surface of the magnetic medium, pass through the gaps between the magnetic media, and enter the first discharge hopper 15 from the lower magnetic pole discharge trough 25 to become tailings. The magnetic particles adsorbed on the surface of the magnetic medium continue to move with the rotation of the rotating ring until they gradually break away from the magnetic field area and enter the top non-magnetic area, where they will be flushed into the upper receiving shell 13 by flushing water to become magnetic products. S5: Flotation. The tailings after magnetic separation enter the flotation machine, and an appropriate amount of flotation reagent is added. The non-magnetic minerals are floated by stirring and aeration to achieve separation. S6: Gravity separation: the tailings after flotation or other minerals that need to be re-selected enter the spiral chute or jig, and separation is achieved through gravity. The tailings after flotation or other minerals that need to be re-selected are sent to the spiral chute or jig, and through gravity, the minerals of different densities produce different movement trajectories in the equipment, thereby achieving separation. The inclination angle of the equipment and the feed amount are adjusted to ensure the effect of gravity separation. S7: Dehydration: Dehydration of the re-selected concentrate is carried out through a dehydration screen. The re-selected concentrate is sent to the dehydration screen. The dehydration screen removes the water in the concentrate through vibration.

[0028] During the screening process, the parameters of feed rate, water supply, and reagent addition are monitored in real time; according to the monitoring results and the beneficiation effect, the process parameters are adjusted in time to ensure the stable operation of the beneficiation process. During the entire screening process, it is necessary to monitor the parameters such as feed rate, water supply, and reagent addition in real time. According to the monitoring results and the beneficiation effect, the process parameters are adjusted in time to ensure the stable operation of the beneficiation process. This includes adjusting the feed rate of the crusher, the feed rate and grinding time of the mill, the magnetic field strength of the magnetic separator, the reagent addition amount and stirring and aeration conditions of the flotation machine, the inclination angle and feed rate of the gravity separation equipment, etc.

[0029] Through these detailed steps, the stability and efficiency of the low-grade ore screening method can be ensured, and the utilization rate of the ore and the product quality can be improved.

[0030] When screening low-grade ores, a jaw crusher is used to preliminarily crush large pieces of ore, and then it is crushed by a cone crusher until the required particle size is reached; the crushed iron ore is screened by a vibrating screen to obtain iron ore particles of different particle sizes; the screened fine iron ore enters a ball mill for grinding until the required fineness is reached; the iron ore slurry after grinding enters a magnetic separator, and the magnetic iron minerals are separated by the action of a magnetic field to obtain an iron ore concentrate; the tailings after magnetic separation enter a flotation machine, and an appropriate amount of flotation reagent is added. The non-magnetic minerals are floated by stirring and aeration to achieve separation; the tailings after flotation or other minerals that need to be re-selected enter a spiral chute or jig, and are separated by gravity; the re-selected concentrate is dehydrated by a dewatering screen; In the magnetic separation process, a magnetic field is generated by the exciting coil 2, and the ore pulp is transported to the feed shell 14 through the pipeline, and enters the separation area through the discharge trough 24 of the magnetic pole. When the magnetic particles in the ore pulp enter the magnetic field, they will be adsorbed on the surface of the magnetic medium by the magnetic field force. Since the magnetic force on the non-magnetic particles is extremely weak, which is smaller than the combined force of the fluid dynamics and gravity, they will break away from the surface of the magnetic medium, pass through the gaps between the magnetic media, and enter the first discharge hopper 15 from the lower magnetic pole discharge trough 25 to become tailings. The magnetic particles adsorbed on the surface of the magnetic medium continue to move with the rotation of the rotating ring until they gradually break away from the magnetic field area and enter the top non-magnetic area, where they will be flushed into the upper receiving shell 13 by flushing water to become magnetic products. During the rotation of the rotating ring separation chamber, the bottom of the separation chamber will contact the elastic scraper 26 to scrape the large particles of minerals at the bottom of the separation chamber to prevent large particles of impurities in the minerals from clogging the filter holes of the separation chamber and clogging the magnetic separation device.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A low-grade ore screening device, comprising: A frame (1) and an exciting coil (2), characterized in that: an exciting coil (2) is provided on the top of the frame (1); an upper bracket (3) is provided on the top of the frame (1) and located outside the exciting coil (2); a main shaft (7) is provided between the tops of the upper brackets (3); a rotating ring sorting chamber (8) is provided on the outer wall of the main shaft (7); a discharge trough (25) is provided on the top of the frame (1) and located below the rotating ring sorting chamber (8); a discharge trough (24) is provided in the middle of the upper bracket (3) and located inside the rotating ring sorting chamber (8); an upper bracket support plate (12) is provided in the middle of the upper bracket (3) and located above the discharge trough (24); the upper bracket support plate ( A feed shell (14) is provided on one side of the top of the upper bracket support plate (12), an upper receiving shell (13) is provided on the top of the upper bracket support plate (12) located above the feed shell (14), a first discharge hopper (15) is provided on the bottom of the discharge trough (25), a second discharge hopper (28) is provided on one side of the outer wall of the discharge trough (25), a main motor (4) is provided on one side of the top of the upper bracket (3), one end of the output shaft of the main motor (4) is fixed to the main shaft (7), the discharge troughs (25) are arranged in a vertical shape with equal distances, an elastic scraper (26) is provided at an interval at the top of the discharge trough (25), and an elastic support pad (27) is provided on one side of the bottom of the elastic scraper (26).

2. A low-grade ore screening device according to claim 1, characterized in that: A pulse mechanism housing (18) is provided on one side of the frame (1), a transmission shaft (21) is provided on one side of the pulse mechanism housing (18), an eccentric swing arm (22) is provided on the outer wall of the transmission shaft (21), a sliding shaft (23) is provided on one end of the eccentric swing arm (22), a pulse shaft (17) is provided on the outer wall of one end of the eccentric swing arm (22), a pulse sleeve (16) is provided on one end of the pulse shaft (17), and one end of the pulse sleeve (16) is fixedly connected to the first discharge hopper (15).

3. A low-grade ore screening device according to claim 1, characterized in that: A driving gear (5) is fixed to one end of the output shaft of the main motor (4), a driven gear (6) is fixed to one end of the main shaft (7), and the driving gear (5) is meshed with the driven gear (6).

4. A low-grade ore screening device according to claim 1, characterized in that: A water pipe support (10) is provided at the top of the upper support (3) and located outside the rotating ring sorting chamber (8), a flushing water pipe (11) is provided inside the water pipe support (10), and a water outlet is provided at the bottom of the flushing water pipe (11).

5. A low-grade ore screening device according to claim 1, characterized in that: A plurality of the rotating ring sorting chambers (8) are provided, and partition plates (9) are provided between the plurality of the rotating ring sorting chambers (8).

6. A low-grade ore screening device according to claim 2, characterized in that: A pulse mechanism drive motor (19) is provided on one side of the frame (1), and a belt drive mechanism (20) is provided between the pulse mechanism drive motor (19) and the drive shaft (21).

7. A low-grade ore screening device according to claim 1, characterized in that: The elastic scraper (26) is made of an elastic steel plate, and the top end of the elastic scraper (26) abuts against an outer wall of one side of the rotating ring sorting chamber (8).

8. A method for screening low-grade ore, characterized in that: It comprises the low-grade ore screening device described in any one of claims 1-7.

9. A low-grade ore screening method according to claim 8, characterized in that: The following steps are involved: S1: Crushing: Use a jaw crusher to initially crush the large ore, and then use a cone crusher for fine crushing until the required particle size is reached; S2: Screening: the crushed iron ore is screened through a vibrating screen to obtain iron ore particles of different sizes; S3: Grinding: the fine iron ore after screening enters the ball mill for grinding until it reaches the required fineness; S4: Wet magnetic separation: the iron ore slurry after grinding enters the magnetic separator, and the magnetic iron minerals are separated by the action of the magnetic field to obtain iron ore concentrate; S5: Flotation. The tailings after magnetic separation enter the flotation machine, and an appropriate amount of flotation reagent is added. The non-magnetic minerals are floated by stirring and aeration to achieve separation. S6: Gravity separation: the tailings or other minerals that need to be re-selected after flotation enter the spiral chute or jig to achieve separation through gravity; S7: Dehydration: Dehydration of the concentrate after gravity separation is carried out through a dehydration screen.

10. A low-grade ore screening method according to claim 8, characterized in that: During the screening process, the parameters of feed rate, water supply and reagent addition are monitored in real time; according to the monitoring results and mineral processing effects, the process parameters are adjusted in time to ensure the stable operation of the mineral processing process.

Images