CN116140057A - Continuous selection device for rich ore extraction - Google Patents

Abstract

The invention relates to the technical field of magnetic separation in mineral processing plants, in particular to a continuous separation device for extracting rich ore. Including frame, vibrating feeding unit, plate type coarse magnetic separation unit and roller type fine magnetic separation unit; the vibrating box of the vibrating feeding unit vibrating feeder is arranged obliquely from the feeding end to the discharging end; plate type coarse magnetic separation unit The plate conveyor of the unit is fixed in the vibrating box at the same inclination; the rough separation waste rock chute is fixed in the bottom of the feeding end, the rough separation concentrate chute is fixed in the bottom of the discharge section, and the fine magnetic separation feed hopper is fixed in the coarse The bottom of the concentrate chute; the roller-type fine magnetic separation unit includes fine magnetic separation and sorting rollers, which are installed in the fine magnetic separation feeding hopper; A vertical partition is arranged between the material flow, which is divided into a selected waste rock discharge hopper and a selected ore discharge hopper. Realize continuous multiple sorting of magnetite, and reduce equipment, infrastructure investment and operation and management costs on the basis of obtaining ideal product indicators.

Description

A continuous separation device for extracting rich ore

technical field

The invention relates to the technical field of magnetic separation in mineral processing plants, in particular to a continuous separation device for extracting rich ore.

Background technique

As most of the current iron ore minerals have a certain degree of magnetism, magnetic separation is the most important beneficiation method for iron ore. Among them, strong magnetic minerals such as magnetite and titanium magnetite are mostly separated by drum magnetic separators. Weak magnetic minerals such as hematite, limonite, specularite, etc. are usually separated by vertical ring high-speed magnetic separator and flat-ring high-speed magnetic separator. Magnetite is currently the most widely used iron ore with large reserves. Due to its strong magnetic properties, magnetite is separated and recovered by a weak magnetic separator with a low magnetic field strength.

At present, many magnetite mines, especially magnetite mines in Australia and Brazil, have a raw ore grade of 45% to 50%, which is a rich ore with relatively high magnetite content. However, the current iron ore sales grade is generally between 58% and 65%, which requires magnetic separation and enrichment of magnetite to achieve the required sales grade index. And for some ores whose grades are between 45% and 0%, they often pass through a magnetic separation, and the grades still cannot meet the requirements of sales.

The existing dry-type magnetic separator can only perform one sorting operation for a single device. To obtain a more ideal sorting index, it is only possible to use multiple devices and set up multiple operations for scanning or selection operations. Equipment investment If it is too large, it will take up a lot of space in the factory building, and the investment in infrastructure is high, and the operation and maintenance costs are high.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a continuous separation device for extracting rich ore, which realizes continuous multiple selection of magnetite, and reduces equipment and infrastructure investment on the basis of obtaining ideal product indicators. Reduce operation and management costs.

To achieve the above object, the present invention adopts the following technical solutions:

A continuous selection device for rich ore extraction, including a frame, a vibrating feeding unit, a plate-type rough magnetic separation unit and a roller-type fine magnetic separation unit; the vibrating feeding unit includes a vibrating feeder, and its vibrating box The body is arranged obliquely from the feed end to the discharge end; the plate coarse magnetic separation unit includes a plate conveyor, and the plate conveyor is fixed in the vibration box with the same inclination; the rougher waste rock chute is fixed at the bottom of the feed end, and the coarse separation The concentrate chute is fixed at the bottom of the discharge section, and the fine magnetic separation feed hopper is fixed at the bottom of the rougher concentrate chute; the roller-type fine magnetic separation unit includes fine magnetic separation and separation rollers, and the fine magnetic separation and separation rollers are installed In the fine magnetic separation feeding hopper; under the fine magnetic separation sorting roller, a longitudinal partition plate is arranged between the roller and the material flow, which is divided into a selected waste rock discharge hopper and a selected ore discharge hopper.

Further, the frame includes an upper platform and a lower platform; the vibrating feeding unit is installed on the upper platform, and the roller type fine magnetic separation unit is installed on the lower platform.

Further, the vibrating feeder includes a vibrating box, an eccentric vibrating block, a vibrating motor, a spring and a base; the eccentric vibrating block is installed on the vibrating box, and the eccentric vibrating block is connected to the vibrating motor through a rotating shaft; the base Fixed on the frame, the top of the spring is connected with the vibration box, and the bottom is connected with the base.

Further, the plate-type coarse magnetic separation unit is composed of a plate conveyor and a power connection plate; the plate conveyor includes a conveying plate, a driving roller and a driving motor; the driving motor is connected with the driving roller, and the conveying plate is installed on the driving roller; the conveying plate is composed of multiple An electromagnetic plate chain plate is connected in series through guide chains at both ends.

Further, the strength of the chain plates of the electromagnetic plate is 100-200 mT, and the gap between adjacent chain plates is 1.3-1.48 times of the maximum particle size of the magnetite.

Further, one end of the chain plate is provided with a contact switch, and the contact switch is a spring-type contact switch; the upper part of the longitudinal beam on the side of the contact switch of the sorting section of the slat conveyor is provided with a connecting plate, and the electric plate There is a power connection groove with a width of 10-20mm in the middle, and the two sides of the power connection groove are insulating rubber.

Further, the roller-type fine magnetic separation unit includes a fine magnetic separation and separation roller and a roller motor; the fine magnetic separation and separation roller is located at the side of the discharge opening of the rough concentrate chute.

Further, the fine magnetic separation sorting roller has a built-in permanent magnet system with a wrap angle of 110-130 degrees on the side facing the material flow. The magnetic system is fan-shaped and set with the horizontal axis of the sorting roller as the center line. The direction of rotation on the feed stream side of the sorting roller is downward rotation.

Further, a 30mm-80mm wear-resistant rubber layer is provided on the surface of the fine magnetic separation and separation roller, and the magnetic field strength on the surface of the roller is 0.6-0.8 times that of the rough separation magnetic field.

Further, the vibrating motor of the vibrating feeder, the transmission motor of the apron conveyor, and the roller motor of the fine magnetic separation and sorting roller are all frequency conversion speed regulating motors, and the current intensity of the electric plate and the fine magnetic separation and sorting roller Adjustable, the start-stop and frequency conversion signals of the three motors, the current intensity signals of the power board and the fine magnetic separation roller are all connected to the control box.

Compared with prior art, the beneficial effect of the present invention is:

1) The present invention creatively integrates the roughing, selecting and vibrating boxes on the same frame, thus realizing the integration of two operations in one piece of equipment, and the structure of the device is compact, thus reducing the number of equipment And layout space, thereby reducing equipment investment and plant construction costs, reducing energy consumption and operating management costs.

2) The coarse magnetic separation of the present invention adopts the mode of vibrating plate magnetic separation. After the material is fed into the upper part of the apron conveyor at the feeding end of the box, the magnetite adsorption is realized under the action of the magnetic force of the electromagnetic plate in the sorting section; under the action of the vibration force provided by the vibrating box, part of the magnetite is realized. Weaker, or the waste rock mixed in the adsorbed magnetite is thrown forward, and the thrown matter is then continuously adsorbed and thrown away by the subsequent electromagnetic plate. Between the slabs, it is discharged to the waste rock discharge hopper. The concentrated ore after repeated adsorption and throwing away is finally moved to the unloading area with the traction of the electromagnetic plate. At this time, the electromagnetic plate is powered off and the magnetic force disappears. hopper. The above-mentioned structure realizes repeated multiple separations of magnetite under the magnetic force and vibration standpoint, thereby ensuring continuous multiple times of non-magnetic rock throwing off of magnetic minerals. Each throwing and re-separation can discharge some low-grade ores with weak magnetic properties and ore-gangster joints, so as to achieve the goal of increasing the grade and lay a solid foundation for the final high-grade concentrate products. Base.

3) In the middle of the power connection plate of the present invention is a power connection groove with a width of only 5-10mm, and the two sides are insulating rubber. The electromagnetic board is energized to realize the magnetization of the electromagnetic board. The power connection method of this building is quickly connected and disconnected, and the danger of contacts is eliminated, which ensures safety.

4) The electromagnetic board of the present invention can realize the adjustment of the field strength between 100-200mT by controlling the magnitude of the connected current, thereby realizing the control and adjustment of the ore magnetic adsorption; the vibration motor of the vibration unit can be frequency-controlled to realize the vibration intensity The control and adjustment of the plate conveyor belt can be adjusted by frequency conversion to realize the time length adjustment of the ore in the sorting section, which can realize the control and adjustment of the sorting time. Thus, the adjustment and control of the magnetic force and vibration force of the sorting force field are realized, and the acquisition of a suitable force field is ensured. Combined with the control of the sorting time, the acquisition of high-grade sorted ore products is guaranteed.

5) The fine magnetic separation feeding hopper of the present invention realizes the clustered distribution of the concentrate products in the width of the rough magnetic separation, thereby reducing the vertical width of the material to 200-400mm, thus effectively avoiding the If it is too wide, the field strength will drop too much when the boundary material is too far away from the magnetic separation roller, resulting in the situation that the magnetic separation material cannot be adsorbed. The separation environment of the magnetic separation roller is advantageously optimized, thereby advantageously avoiding the loss of magnetite at the boundary of the material flow.

6) The present invention carries out fine magnetic separation again to the product of coarse magnetic separation, and the field strength of fine magnetic separation is 0.6～0.8 times of coarse magnetic separation field strength, thereby released again by the lower field strength of fine magnetic separation mixed in Some low-grade magnetite or conjoined bodies in the coarse magnetic separation concentrate have achieved a further increase in the grade of the coarse magnetic separation concentrate. Through rough magnetic separation and fine magnetic separation, the grade of magnetite with a grade of more than 45% can be increased to about 65%, so as to obtain high-quality iron concentrate, thus meeting the market demand for high-quality magnetite concentrate .

7) The surface of the magnetic separation roller of the present invention is provided with a wear-resistant rubber layer of 30 mm to 80 mm, which advantageously guarantees the service life of the magnetic separation roller, reduces the maintenance frequency of the magnetic separation roller, and improves the equipment operation rate.

8) The roller motor of the fine magnetic separation and sorting roller of the present invention is a variable frequency speed regulation motor, so that the inertial kinetic energy of the magnetic ore adsorbed can be adjusted when unloading, and the unloading track of the magnetic ore can be changed, thereby adjusting the separation plate on both sides The proportion of the material to ensure the maximum grade of magnetic separation concentrate.

9) The vibrating motor of the vibrating feeder of the present invention, the transmission motor of the apron conveyor, and the roller motor of the fine magnetic separation and separation roller are all frequency conversion speed regulating motors, and the electric plate and the fine magnetic separation and separation roller The current intensity is adjustable, the start-stop and frequency conversion signals of the three rotating motors, the current intensity signals of the power board and the fine magnetic separation roller are all connected to the control box. high degree of automation.

Description of drawings

Fig. 1 is a schematic top view of the structure of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is a schematic diagram of the structure of the power connection board and the power connection groove of the present invention.

In the figure: 1-frame 2-vibration box 3-eccentric excitation block 4-rotating shaft 5-vibration motor 6-spring 7-base 8-upper platform 9-plate conveyor 10-connection plate 11-longitudinal beam 12-conveyor plate 13-guide chain 14-transmission roller 15-transmission motor 16-basic platform 17-rougher waste rock chute 18-rougher concentrate chute 19-first support 20-second support 21 contacts Switch 22-connection tank 23-insulating rubber 24-fine magnetic separation feed hopper 25-fine magnetic separation sorting roller 26-roller motor 27-bearing seat 28-base 29-lower platform 30-partition plate 31- Selected waste rock discharge hopper 32-selected ore discharge hopper 33-magnetic system.

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more; the term

The orientation or positional relationship indicated by "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on The orientation or positional relationship shown in the drawings is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as Limitations on the Invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

【Example】

As shown in Figure 1-3, a continuous separation device for extracting rich ore products includes a frame 1, a vibrating feeding unit, a plate-type rough magnetic separation unit and a roller-type fine magnetic separation unit.

The frame 1 includes an upper platform 8 and a lower platform 29 , the upper platform 8 is located at the top of the frame 1 , and the lower platform 19 is located at the bottom of the frame 1 .

The vibrating feeder is a vibrating feeding unit, and the vibrating feeder includes a vibrating box 2 , an eccentric vibration block 3 , a vibrating motor 5 , a spring 6 and a base 7 . Two eccentric vibration excitation blocks 3 are mirror-symmetrically arranged and mounted on the top of the vibration box 2, and the eccentric vibration excitation blocks 3 are connected to the vibration motor 5 through the rotating shaft 4 and the universal coupling. The vibrating box 2 is arranged obliquely from the feeding end to the discharging end. Two springs 6 are arranged on the outer sides of the side plates on both sides in the length direction of the box. The base 7 is fixedly connected to the upper platform 8 of the frame 1. The top of the spring 6 It is connected with the vibrating box body 2, and the bottom is connected with the base 7.

The plate-type coarse magnetic separation unit is composed of a plate conveyor 9 and a power-connecting plate 10 . The slat conveyor 9 is built in the vibration box 2 with the same inclination and is connected with the inner side of the vibration box 2 through the longitudinal beams 11 on both sides.

The slat conveyor 9 includes a conveying plate 12 , a driving roller 14 and a driving motor 15 . The driving motor 15 is connected with the driving drum 14 and drives it to rotate, and the conveying plate 12 is installed on the driving drum 14 . The conveying plate 12 is formed in series by a plurality of electromagnetic plate chain plates through the guide chains 13 at both ends.

The strength of the chain plate of the electromagnetic plate is 100-200mT, and the gap between adjacent chain plates is 1.3-1.48 times the maximum particle size of the magnetite ore. One end of each chain plate is provided with a contact switch 21, and the contact switch 21 is a spring contact switch. The upper part of the longitudinal beam 11 located on one side of the slat conveyor 9 sorting section and the contact switch 21 is provided with a power connection plate 10, and the middle of the power connection plate 10 is provided with a power connection groove 22 with a width of 10-20mm. The side is insulating rubber 23.

The drive motor 15 of the drive roller 14 of the slat conveyor 9 is placed outside the vibrating box 2, and is connected with the foundation platform 16 bolted to the side wall of the box body.

The plate conveyor 9 is divided into a sorting section and an ore unloading section in the length direction from the feeding end to the discharging end. The length of the sorting section is 3-8 meters, the length of the unloading section is 1-2 meters, and Below is the roller fine magnetic separation unit.

The bottom of the sorting section is connected to the rougher waste rock chute 17, and the bottom of the discharge section is connected to the rougher concentrate chute 18, the rougher waste rock chute passes through its first support 19, and the rougher concentrate chute passes through its second support 20 It is connected with the upper platform 8 of the rack 1.

The roller-type fine magnetic separation unit includes a fine magnetic separation feed hopper 24 , a fine magnetic separation sorting roller 25 and a roller motor 26 . The fine magnetic separation feed hopper 24 is connected with the rough separation concentrate discharge chute 18 through a flange. The fine magnetic separation sorting roller 25 is connected with the lower level 29 of the frame 1 through the bearing blocks 27 at its two ends, and the roller motor 26 is placed outside the fine magnetic separation feed hopper 24 and passed through the base 28 and the frame 1. There are 29 companies on the lower platform. The fine magnetic separation and sorting roller 25 is located in the fine magnetic separation feed hopper 24, below the side of the rough separation concentrate chute 18 discharge port.

The fine magnetic separation feeding hopper 24 is located below the return chain plate of the plate conveyor unloading section, and is a closing type hopper, the width of the lower opening of the hopper is 200-400 mm. The fine magnetic separation and sorting rollers 25 are arranged at 50-100 mm to the left of the material flow of the fine magnetic separation feed hopper 24 .

Below the fine magnetic separation and sorting roller 25, a longitudinal partition 30 is arranged between the roller and the material flow, and with the longitudinal partition 30 as the boundary, a selected waste rock discharge hopper is arranged below the partition 31 and selected ore discharge hopper 32.

The fine magnetic separation sorting roller 25 has a built-in permanent magnet magnetic system 33 with a wrap angle of 110-130 degrees on the side facing the material flow. The magnetic system 33 is fan-shaped and set with the horizontal axis of the sorting roller as the center line. The direction of rotation of the feed flow side of the sorting drum 25 is downward rotation.

A wear-resistant rubber layer of 30 mm to 80 mm is provided on the surface of the fine magnetic separation and sorting roller 25 , and the magnetic field strength on the surface of the roller is 0.6 to 0.8 times that of the coarse separation magnetic field.

The vibrating motor 5 of the vibrating feeder, the transmission motor 15 of the plate conveyor, and the roller motor 26 of the fine magnetic separation and sorting roller are all frequency conversion speed regulating motors, and the power of the electric plate 10 and the fine magnetic separation and sorting roller 25 The current intensity is adjustable, the start-stop and frequency conversion signals of the three motors, the current intensity signals of the power board 10 and the fine magnetic separation and sorting roller 25 are all connected with the control box.

The present invention creatively integrates the roughing, refining and vibrating box 2 on the same frame, thereby realizing the integration of two stages of operations in one piece of equipment, and the device has a compact structure, thus reducing the number of equipment and The space is arranged, thereby reducing the investment in equipment and the construction cost of the plant, reducing energy consumption and operation management costs.

The coarse magnetic separation of the present invention adopts the mode of vibrating plate magnetic separation. After the material is fed into the upper part of the apron conveyor 9 at the feeding end of the box, the adsorption of magnetite is realized under the action of the magnetic force of the electromagnetic plate in the sorting section; under the action of the vibration force provided by the vibrating box 2, the Part of the magnetism is weak, or the waste rock mixed in the adsorbed magnetite is thrown forward, and the thrown matter is then continuously adsorbed and thrown away by the subsequent electromagnetic plate. Between the slits of the slabs, it is discharged to the waste rock discharge hopper. The concentrated ore after repeated adsorption and throwing away is finally moved to the unloading area with the traction of the electromagnetic plate. At this time, the electromagnetic plate is powered off and the magnetic force disappears. Hopper 24. The above-mentioned structure realizes repeated multiple separations of magnetite under the magnetic force and vibrating position, thereby ensuring the non-magnetic rocks of magnetic minerals to be thrown off for multiple times continuously. Each throwing and re-separation can discharge some low-grade ores with weak magnetic properties and ore-gangster joints again, so as to achieve the purpose of gradually increasing the grade and lay a solid foundation for high-grade final concentrate products. Base.

In the middle of the connecting plate 10 of the present invention is a connecting groove 22 with a width of only 5-10 mm, and the two sides are insulating rubber 23. Spring compression electrifies the electromagnetic board to realize magnetization of the electromagnetic board. The power connection method of this building is quickly connected and disconnected, and the danger of contacts is eliminated, which ensures safety.

The electromagnetic board of the present invention can realize the adjustment of the field strength between 100 and 200mT by controlling the magnitude of the connected current, thereby realizing the control and adjustment of the ore magnetic adsorption; the vibration motor 5 of the vibration unit can be adjusted by frequency conversion to realize the vibration intensity Control and adjustment: The transmission motor 15 of the plate conveyor belt can be adjusted by frequency conversion to realize the time length adjustment of the ore in the sorting section, which can realize the control and adjustment of the sorting time. Thus, the adjustment and control of the magnetic force and vibration force of the sorting force field are realized, and the acquisition of a suitable force field is ensured. Combined with the control of the sorting time, the acquisition of high-grade sorted ore products is guaranteed.

The fine magnetic separation feeding hopper 24 of the present invention realizes the clustered distribution of the concentrated ore product in the width of the rough magnetic separation, thereby reducing the vertical width of the material to 200-400 mm, thereby effectively avoiding the excessive separation of the material due to the separation width. Wide, when the boundary material is too far away from the magnetic separation roller, the field strength drops too much, resulting in the situation that the magnetic separation material cannot be adsorbed. The separation environment of the magnetic separation roller is advantageously optimized, thereby advantageously avoiding the loss of magnetite at the boundary of the material flow.

In the present invention, fine magnetic separation is carried out on the product of coarse magnetic separation again, and the field strength of fine magnetic separation is 0.6～0.8 times of the field strength of coarse magnetic separation, so that the lower field strength of fine magnetic separation releases the mixture mixed in coarse magnetic separation again. Some low-grade magnetite or conjoined bodies in the concentrated ore have achieved a further increase in the grade of the coarse magnetic-separated concentrate. Through rough magnetic separation and fine magnetic separation, the grade of magnetite with a grade of more than 45% can be increased to about 65%, so as to obtain high-quality iron concentrate, thus meeting the market demand for high-quality magnetite concentrate .

The fine magnetic separation and sorting roller 25 of the present invention is provided with a wear-resistant rubber layer of 30 mm to 80 mm on the surface, which advantageously guarantees the service life of the magnetic separation roller, reduces the maintenance frequency of the magnetic separation roller, and improves the equipment operation rate.

The roller motor 26 of the fine magnetic separation and sorting roller 25 of the present invention is a variable frequency speed regulation motor, so that the inertial kinetic energy when the magnetic ore is unloaded can be adjusted, the unloading trajectory of the magnetic ore can be changed, and the two sides of the partition plate can be adjusted. The proportion of the material to ensure the maximum grade of magnetic separation concentrate.

The vibration motor 5 of the vibrating feeder of the present invention, the transmission motor 15 of the apron conveyor, and the roller motor 26 of the fine magnetic separation and separation roller are all frequency conversion speed regulating motors, and the electric plate 10 and the fine magnetic separation and separation roller The current intensity of 25 is adjustable, the start-stop and frequency conversion signal of three rotating motors, the current intensity signal of power board 10 and fine magnetic separation sorting roller 25 are all connected with control box. high degree of automation.

Claims (10)

1. A continuous selection device for rich ore extraction, characterized in that: it comprises a frame, a vibrating feeding unit, a plate type coarse magnetic separation unit and a roller type fine magnetic separation unit; the vibrating feeding unit includes a vibrating feeding unit Feeder, the vibrating box is arranged obliquely from the feeding end to the discharging end; the plate type coarse magnetic separation unit includes a plate conveyor, and the plate conveyor is fixed in the vibrating box with the same inclination; the rough waste rock chute is fixed in the feeding The bottom of the material end, the rougher concentrate chute is fixedly connected to the bottom of the discharge end, and the fine magnetic separation feed hopper is fixedly connected to the bottom of the rougher concentrate chute; the roller-type fine magnetic separation unit includes fine magnetic separation rollers, fine magnetic The separation and separation rollers are installed in the fine magnetic separation feed hopper; below the fine magnetic separation and separation rollers, there is a longitudinal partition between the rollers and the material flow, which is divided into a selected waste rock discharge hopper and a selected ore discharge hopper . 2. A kind of continuous selection device for rich ore extraction according to claim 1, characterized in that: the frame includes an upper platform and a lower platform; the vibrating feeding unit is installed on the upper platform, and the roller type fine The magnetic separation unit is installed on the lower platform. 3. A continuous selection device for rich ore extraction according to claim 1, characterized in that: the vibrating feeder includes a vibrating box, an eccentric vibration block, a vibrating motor, a spring and a base; The eccentric excitation block is installed on the vibration box, and the eccentric excitation block is connected with the vibration motor through the rotating shaft; the base is fixed on the frame, the top of the spring is connected with the vibration box, and the bottom is connected with the base. 4. A continuous selection device for rich ore extraction according to claim 1, characterized in that: the plate type coarse magnetic separation unit is composed of a plate conveyor and a power connection plate; the plate conveyor includes a conveying plate, a transmission The roller is connected to the transmission motor; the transmission motor is connected to the transmission roller, and the conveying plate is installed on the driving roller; the conveying plate is composed of a plurality of electromagnetic plates and chain plates connected in series through guide chains at both ends. 5. A continuous separation device for extracting rich ore according to claim 4, characterized in that: the strength of the electromagnetic plate chain plate is 100-200mT, and the gap between adjacent chain plates is the maximum particle size of magnetite 1.3 to 1.48 times of that. 6. A continuous selection device for rich ore extraction according to claim 4, characterized in that: one end of the chain plate is provided with a contact switch, and the contact switch is a spring-type contact switch; In the sorting section of the slat conveyor, the upper part of the longitudinal beam on one side of the contact switch is provided with a power connection plate, and a power connection groove with a width of 10-20mm is arranged in the middle of the power plate, and the two sides of the power connection groove are insulating rubber. 7. A continuous selection device for rich ore extraction according to claim 1, characterized in that: said roller-type fine magnetic separation unit comprises a fine magnetic separation sorting roller and a roller motor; The sorting rollers are located on the side of the discharge opening of the rough concentrate chute. 8. A continuous separation device for enriched ore extraction according to claim 7, characterized in that: said fine magnetic separation and separation roller is built-in a permanent magnet with a wrap angle of 110-130 degrees on the side facing the material flow Magnetic system, the magnetic system is fan-shaped and set with the horizontal axis of the sorting roller as the center line, and the direction of rotation of the feed flow side of the fine magnetic separation and sorting roller is downward rotation. 9. A continuous separation device for rich ore extraction according to claim 7, characterized in that: the surface of the fine magnetic separation roller is provided with a wear-resistant rubber layer of 30 mm to 80 mm, and the surface of the roller is The intensity of the magnetic field is 0.6-0.8 times of the intensity of the roughing magnetic field. 10. A continuous selection device for rich ore extraction according to claim 4, characterized in that: the vibration motor of the vibrating feeder, the drive motor of the apron conveyor, the fine magnetic separation and separation roller The roller motors are all frequency conversion motors, the current intensity of the power board and the fine magnetic separation and sorting roller is adjustable, the start-stop and frequency conversion signals of the three motors, the current intensity signal of the power board and the fine magnetic separation and separation roller are connected to the control box.

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