CN105772219B - Wind-force dry-type magnetic separator - Google Patents

Abstract

The invention discloses an air dry type magnetic separator, which comprises a frame, a casing, a dust removal device connected with the inner cavity of the casing for exhausting and dedusting, and a non-magnetic cylinder installed in the casing and driven to rotate by a driving device Sieve roller, feeding device is installed above the non-magnetic cylindrical sieve roller, fine material bin, tailing material bin and unloading device are installed under the non-magnetic cylindrical sieve roller, and the roller surface of the non-magnetic cylindrical sieve roller is equipped with A number of ventilation holes, a fixed magnetic system is installed inside the non-magnetic cylindrical screen roller, and an air chamber connected with the ventilation holes is also arranged inside the non-magnetic cylindrical screen roller. There is a baffle plate extending from the discharge port of the feeding device along the rotation direction of the non-magnetic cylindrical sieve roller, and there is a distance between the baffle plate and the outer surface of the non-magnetic cylindrical sieve roller. The air dry magnetic separator has the advantages of simple and compact structure, can effectively reduce magnetic agglomeration and inclusion, and improve the efficiency of magnetic separation of materials.

Description

Wind Dry Magnetic Separator

technical field

The invention relates to the technical field of magnetic separation equipment, in particular to an air-driven dry magnetic separator.

Background technique

Magnetic separation is a technology based on the magnetic difference of different components in the separated material. In the actual material separation, the material particles are simultaneously affected by the magnetic force and the competitive force in the non-uniform magnetic field of the magnetic separator, and the combined force of the two determines the trajectory of the particles. In order to increase the sortability between different components, it is theoretically necessary to consider expanding the difference in the resultant force of magnetic force and competitiveness of different components in the magnetic field.

In the existing dry magnetic separation equipment, the inclusions caused by the agglomeration of magnetic particles are relatively serious, and the sorting effect is poor. How to realize the loosening of materials during the sorting process, reduce magnetic agglomeration and inclusions, and effectively recover magnetic materials at the same time is a dry magnetic The problem to be solved by selecting the equipment.

The magnetic roller is widely used in iron ore separation because of its simple structure and convenient operation. At present, the magnetic roller combined with magnetic wind is a research hotspot, and how to effectively introduce wind force in the magnetic field has become the key point of this research.

The Chinese patent with publication number CN104128260A weakens the gravity effect and strengthens the magnetic force effect through the introduction of vertical wind force and roller surface wind force. The disadvantage is that the effect of the primary roller is poor, and it is necessary to rely on multi-stage separation to effectively improve the separation efficiency.

The Chinese patent with publication number CN103128000A considers introducing wind force and vibrating force opposite to the direction of magnetic force to strengthen the sorting process. The disadvantage is that the design of the air-permeable plate outside the roller and its joint design with the rotating air cavity are not clear, which leads to the unclear effect of wind force on the material, and the introduction of vibration force has high requirements for equipment manufacturing, making it difficult to effectively use the equipment.

The Chinese patent whose publication number is CN103008105A feeds the ore through the air flow, so that the material is in a fluidized state, and the loose material also has an impact decontamination effect on the material on the surface of the roller. Its disadvantage is that it is only suitable for fine-grained materials with a narrower particle size, and the airflow pressure is demanding. Although the materials are fluidized, it is difficult to guarantee the recovery rate.

Notification number is CN202290293U Chinese patent considers to introduce fluidized sorting groove below the roller, to play the effect of loose material. The disadvantage is that the design requirements for the fluidized bed are high, the material is difficult to distribute evenly on the fluidized bed, and the dust collection function is not considered in the design.

Although the above-mentioned technologies have introduced wind power into the magnetic field, either the wind power has a single effect, and it is difficult to take into account the grade and recovery rate at the same time, or the design is unreasonable, and it is difficult to apply and realize.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and provide a wind-driven dry-type magnetic separator with a simple and compact structure, which can effectively reduce magnetic agglomeration inclusions and improve the efficiency of material magnetic separation.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A wind-driven dry-type magnetic separator, comprising a frame, a casing, a dust removal device connected with the inner cavity of the casing to extract air and dust, and a non-magnetic cylindrical screen roller installed in the casing and driven to rotate by a driving device. A feeding device is installed above the non-magnetic cylindrical screen roller, and a fine material bin, a tailing bin and a discharge device are arranged below the non-magnetic cylindrical screen roller. The roller surface of the non-magnetic cylindrical screen roller is A number of ventilation holes are provided, and a fixed magnetic system is installed inside the non-magnetic cylindrical screen roller. An air chamber connected with the ventilation holes is also arranged inside the non-magnetic cylindrical screen roller. The casing is connected with the wind device, and the casing is equipped with a baffle plate extending from the discharge port of the feeding device along the rotation direction of the non-magnetic cylindrical screen roller. Leave space between surfaces.

In the above-mentioned air dry magnetic separator, preferably, the side of the baffle plate facing the non-magnetic cylindrical screen roller is provided with several vertical plates arranged at intervals, and each vertical plate is arranged along the axis of the non-magnetic cylindrical screen roll. arranged in the direction.

In the above-mentioned wind-force dry magnetic separator, preferably, the distance between the baffle plate and the outer surface of the non-magnetic cylindrical screen roller is 10 mm to 300 mm, and the extension length of the baffle plate corresponds to the length of the non-magnetic cylindrical sieve The central angle of the roller is 5°~45°.

The above-mentioned wind-force dry magnetic separator, preferably, the discharge port of the feeding device is connected with a wind-blocking baffle that is close to the outer surface of the non-magnetic cylindrical screen roller, and the wind-blocking baffle and the material blocking The plates are located on both sides of the discharge port of the feeding device.

The above-mentioned air dry magnetic separator, preferably, the magnetic system extends from the discharge port of the feeding device along the rotation direction of the non-magnetic cylindrical screen roll, and the magnetic system and the non-magnetic cylindrical screen roll The axial width of the cylindrical screen rollers is the same, and the magnetic wrap angle of the magnetic system can be set from 90° to 180°.

In the above-mentioned wind-force dry magnetic separator, preferably, the aperture of the ventilation hole gradually decreases along the radially outward direction of the non-magnetic cylindrical screen roll, and the roll surface opening ratio of the non-magnetic cylindrical screen roll is 1%~20%.

For the wind-forced dry-type magnetic separator above, preferably, the unloading device includes a material partition plate and a selection blowing pipe, and the material partition plate is installed on the fine material bin and the tail end in a manner that the rotation angle can be adjusted. Between the silos, the angle adjustment range of the material partition plate is ±40°; the selected material blowing pipe is installed above the fine material silo in a way that the air supply angle can be adjusted.

In the above-mentioned wind-force dry magnetic separator, preferably, the air chamber is only ventilated to the ventilation holes that move to a fixed area near the discharge port of the feeding device, and the fixed area is along the non-magnetic The rotation direction of the cylindrical screen roller extends, and the extension length of the fixed area corresponds to the central angle of the non-magnetic cylindrical screen roller, which is 100°~190°.

In the above-mentioned air dry magnetic separator, preferably, the air chamber is an arc-shaped air chamber fixed on the magnetic system and having a thickness of 3 mm to 6 mm in the radial direction of the non-magnetic cylindrical sieve roller. The gap between the chamber and the inner surface of the non-magnetic cylindrical screen roller is 3mm~5mm; the air chamber opens toward one end of the inner surface of the nonmagnetic cylindrical screen roller, and the opening ratio is 30%~80%; the two sides of the air chamber A sealing strip is set between the inner surface of the non-magnetic cylindrical screen roller; the air chamber is an integral chamber and is connected to the air supply device through the air guide channel; or the air chamber is separated into multiple non-magnetic The first small chambers arranged in the axial direction of the magnetic cylindrical sieve rollers, each first small chamber is connected to the air supply device through its own independent air guide channel; or the air chamber is divided into a plurality of The second small chambers are arranged in the circumferential direction of the non-magnetic cylindrical screen roller, and each second small chamber is connected to the air supply device through their own independent air guide channels; or the air chambers are connected to each other through a plurality of interconnected The strip-shaped chamber is divided into several sub-chambers, and each sub-chamber is divided into a plurality of first small chambers arranged in the axial direction of the non-magnetic cylindrical sieve roller or a plurality of first small chambers arranged in the axial direction of the non-magnetic cylindrical sieve through a partition. The second small chambers arranged in the circumferential direction of the roller, each strip-shaped chamber and the first small chamber or each strip-shaped chamber and the second small chamber are connected to the air supply device through their own independent air guide channels .

In the above-mentioned air dry magnetic separator, preferably, the air chamber includes an annular chamber arranged along the circumference of the entire inner surface of the non-magnetic cylindrical screen roller, and the annular chamber is divided into several non-magnetic The third small chambers arranged in the circumferential direction of the cylindrical screen rollers are provided with an air guide channel at both ends of each third small chamber, and an air supply device is sleeved on the rotating shaft of the non-magnetic cylindrical screen rollers. Connected hollow air supply pipes, each air guide channel extends to the hollow air supply pipe along the radial direction of the non-magnetic cylindrical screen roller and contacts the outer surface of the hollow air supply pipe, and the hollow air supply pipe is provided with only A gap for supplying air to the air guide passage communicated with the ventilation hole in the fixing area.

Compared with the prior art, the present invention has the advantages that: the air-force dry magnetic separator of the present invention is provided with some ventilation holes on the roll surface of the non-magnetic cylindrical screen roll, and the inside and outside of the non-magnetic cylindrical screen roll The magnetic system and the baffle plate are respectively set up, and the air is sprayed out from the ventilation holes through the air supply device and the air chamber, which can form a composite force field with the combined effects of wind force, gravity, magnetic force and centrifugal force, which is more conducive to fine-grain embedding Strong magnetic ore separation can effectively promote the dispersion between magnetic and non-magnetic particles, reduce magnetic agglomeration and inclusion, and strengthen gravity separation, effectively solve the problem of fine-grained magnetic agglomeration and inclusion in the process of magnetic separation of fine-grained materials, and improve the The efficiency of magnetic separation of fine-grained materials; at the same time, the non-magnetic cylindrical screen roller, magnetic system and baffle plate are arranged in a relatively closed shell, which is beneficial to reduce dust pollution. The air dry magnetic separator has a simple and compact structure, is easy to manufacture, and has strong operability, and is especially suitable for the separation of fine-grained strong magnetic minerals.

Description of drawings

Fig. 1 is the schematic structural view of the air dry magnetic separator of embodiment 1.

Fig. 2 is a top view of the air dry magnetic separator in Fig. 1 (with the panel on the top of the casing removed).

FIG. 3 is a schematic diagram of the enlarged structure at A in FIG. 1 .

FIG. 4 is a schematic diagram of the enlarged structure at B in FIG. 1 .

FIG. 5 is a schematic diagram of the air chamber of the first structural form in Embodiment 1. FIG.

FIG. 6 is a schematic diagram of the air chamber of the second structural form in Embodiment 1. FIG.

FIG. 7 is a schematic diagram of the air chamber of the third structural form in Embodiment 1. FIG.

Fig. 8 is a structural schematic diagram of the air chamber and the air guide channel arranged on the non-magnetic cylindrical screen roller in Embodiment 2.

FIG. 9 is a schematic diagram of an enlarged structure at point C in FIG. 8 .

illustration:

1. Frame; 2. Cabinet; 3. Dust removal device; 4. Non-magnetic cylindrical screen roller; 41. Ventilation hole; 5. Feeding device; 6. Concentrate bin; 7. Tailing bin; 8. Magnetic Department; 9. Air chamber; 10. Air supply device; 11. Material blocking plate; 12. Vertical plate; 13. Wind blocking plate; 14. Material partition plate; A small chamber; 102, the second small chamber; 103, a strip chamber; 104, the third small chamber; 105, a hollow air supply pipe.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1 to 4, the wind-force dry magnetic separator of the present embodiment includes a frame 1, a casing 2, a dust removal device 3 that communicates with the inner cavity of the casing 2 for ventilation and dust removal, and is installed in the casing 2. The non-magnetic cylindrical sieve roller 4 is driven by the driving device to rotate. The casing 2 is installed on the frame 1. The dust removal device 3 adopts the combination of the exhaust fan and the exhaust pipe. The driving device adopts the combination of the existing motor and the reducer. The driving device drives the non-magnetic cylindrical screen roller 4 to rotate at an adjustable speed to adapt to different sorting conditions. A feeding device 5 is installed above the non-magnetic cylindrical screen roller 4. The feeding device 5 is a feeding hopper. The discharge port is located directly above the non-magnetic cylindrical sieve roller 4, and the bottom of the non-magnetic cylindrical sieve roller 4 is provided with a fine material bin 6, a tailing material bin 7 and a discharge device. The roller surface of the non-magnetic cylindrical sieve roller 4 is provided with a number of ventilation holes 41, the inside of the non-magnetic cylindrical sieve roller 4 is provided with a fixedly installed magnetic system 8, and the non-magnetic cylindrical sieve roller 4 is also provided with ventilation holes 41. The air chamber 9, the air chamber 9 links to each other with an air supply device 10, the air supply device 10 includes a blower fan and an air supply pipe, the air supply device 10 can supply wind to the air chamber 9, and the wind is blown out from the ventilation hole 41, and the air supply The air volume is adjusted according to the materials of different particle sizes. The casing 2 is equipped with a baffle plate 11 extending from the discharge port of the feeding device 5 along the rotation direction of the non-magnetic cylindrical screen roller 4. There is a gap between them, through the counterattack of the baffle plate 11 and the wind force and centrifugal force of the non-magnetic cylindrical screen roller 4, the feed material is fluidized between the non-magnetic cylindrical sieve roller 4 and the baffle plate 11, and strengthened The recovery of magnetic materials in the feed. The compressed air from the air supply device 10 is fed into the air chamber 9, and then blown out through the ventilation hole 41, forming an air flow opposite to the direction of the magnetic force in the magnetic separation area of the non-magnetic cylindrical sieve roller 4, which can realize the loosening of magnetic agglomerates , to improve the sorting effect.

In this embodiment, as shown in FIG. 3 , the side of the baffle plate 11 facing the non-magnetic cylindrical screen roller 4 is provided with several vertical plates 12 arranged at intervals along the extending direction of the material baffle plate 11, and each vertical plate 12 is arranged along the non-magnetic The axial direction arrangement of the magnetic cylindrical screen roller 4 and the arrangement of the vertical plate 12 can further strengthen the recovery of magnetic materials.

In this embodiment, the material retaining plate 11 is a circular arc plate, the distance between the material retaining plate 11 and the outer surface of the non-magnetic cylindrical screen roller 4 is 10 mm to 300 mm, and the extension length of the material retaining plate 11 corresponds to that of the non-magnetic cylindrical screen. The central angle of the roller 4 is 5° to 45°. The baffle plate 11 can be provided with an inner lining of a wear-resistant and impact-resistant material, and the inner lining is installed in a detachable manner for easy replacement.

In the present embodiment, as shown in Fig. 1 and Fig. 3, the discharge opening of feeding device 5 is connected with wind-blocking baffle 13, and wind-blocking baffle 13 is close to the outer surface of non-magnetic cylinder screen roller 4, and The wind baffle 13 and the material baffle 11 are respectively arranged on both sides of the discharge port of the feeding device 5 . The wind-blocking baffle 13 can prevent unselected materials from overflowing from the side of the non-sorting chamber, and at the same time promote fine-grained non-magnetic materials to enter the dust removal device 3 .

In this embodiment, the magnetic system 8 extends from the discharge port of the feeding device 5 along the rotation direction of the non-magnetic cylindrical screen roller 4. The magnetic system 8 is fan-shaped as a whole, and the magnetic system 8 and the non-magnetic cylindrical screen roller 4 The width of the non-magnetic cylindrical screen roller 4 in the axial direction is the same, and the magnetic wrap angle of the magnetic system 8 can be set from 90° to 180° (that is, the extension length of the magnetic system 8 corresponds to the central angle of the non-magnetic cylindrical screen roller 4 90°~180°); the magnetic system 8 can adopt any one of N/S magnetic pole alternating arrangement magnetic system, single N magnetic pole arrangement magnetic system and single S magnetic pole arrangement magnetic system. When the magnetic system 8 adopts N/S magnetic poles alternately arranged magnetic system, it can make the materials turn over and improve the separation effect. Above-mentioned magnetic system 8 can adopt permanent magnet or electromagnetic.

In the present embodiment, as shown in Figure 3, the aperture of ventilation hole 41 gradually decreases along the radially outward direction of non-magnetic cylindrical screen roller 4, and the hole pattern design of this kind of ventilation hole 41 can reduce wind force in the ventilation hole. The resistance loss is improved, and the utilization efficiency of the wind is improved. The roll surface opening rate of the non-magnetic cylindrical screen roller 4 is 1%~20%. Several air holes 41 are preferably evenly distributed on the roll surface of the non-magnetic cylindrical screen roll 4. The size of the air holes 41 depends on the particle size of the sorted material. It depends on the size, generally 0.2mm~5mm. When the sorted material is a medium-grained material of 1~15, the aperture size of the ventilation hole 41 is 0.5mm~5mm. The non-magnetic cylindrical screen roller 4 of this embodiment is made of non-magnetic and wear-resistant materials, and its two ends are sealed. In other embodiments, the ventilation hole 41 on the non-magnetic cylindrical screen roller 4 is not limited to one aperture size and type, for example, a combination of through holes with different aperture sizes and types can be used to make the ejected air flow uneven, It can further promote the effective dispersion and separation of materials.

In this embodiment, as shown in Figure 4, the unloading device includes a material dividing plate 14 and a selection blowing pipe 15, and the selection blowing pipe 15 is connected with a selection fan. This kind of unloading device can refer to the existing technology. The material dividing plate 14 is installed between the fine material bin 6 and the tailing material bin 7 in an adjustable rotation angle, and the angle adjustment range of the material dividing plate 14 is ±40°. For example, the material dividing plate 14 can adopt bolts Hinged installation, the rotation angle can be adjusted by tightening the bolts. By adjusting the material separation plate 14 to a suitable angle, the output of concentrate and tailings can reach the best ratio; the selected blowing pipe 15 can be adjusted in the way of air supply angle Installed on the top of the fine material bin 6, the air supply angle can be adjusted from 0° to 90°, and the selection blowing pipe 15 can also be installed in a bolt-hinged way, by adjusting the selection blowing pipe 15 to a suitable air supply The angle and proper wind speed can make the magnetic products reach the best grade.

In the present embodiment, the air chamber 9 is only ventilated to the ventilation holes 41 that move to the fixed area near the discharge port of the feeding device 5, and the fixed area is from the discharge port of the feeding device 5 along the side of the non-magnetic cylindrical screen roller 4. The direction of rotation extends, and the extension length of the fixed area corresponds to the central angle of the non-magnetic cylindrical screen roller 4, which is 100°-190°. In this embodiment, the central angle corresponding to the fixed area is slightly larger than the central angle corresponding to the magnetic system 8, which can further promote the smooth desorption of magnetic materials from the non-magnetic cylindrical screen roller 4 in the non-sorting area.

In this embodiment, the air chamber 9 is an arc-shaped air chamber fixed on the magnetic system 8 and having a thickness of 3 mm to 6 mm in the radial direction of the non-magnetic cylindrical screen roller 4. The air chamber 9 and the non-magnetic cylindrical screen roller The gap on the inner surface of 4 is 3mm~5mm; the air chamber 9 opens towards one end of the inner surface of the non-magnetic cylindrical screen roller 4, and the opening ratio is 30%~80%; Sealing strips are arranged between the inner surfaces.

The air chamber 9 of this embodiment is an integral chamber and is connected to the air supply device 10 through the air guide channel. Further, the air chamber 9 can also be divided into several small chambers by a partition, and each small chamber The independent air guide channel is connected with the air supply device 10 . The air chamber 9 can be specifically arranged in the following structural forms: 1. The air chamber 9 is divided into a plurality of first small chambers 101 arranged in the axial direction of the non-magnetic cylindrical screen roller 4 by a partition plate (see Fig. 5 ), each first small chamber 101 is in an arc shape arranged around the non-magnetic cylindrical sieve roller 4, and each first small chamber 101 is connected to the air supply device 10 through its own independent air guiding channel; 2. Air chamber 9. Separated by partitions into a plurality of second small chambers 102 arranged in the circumferential direction of the nonmagnetic cylindrical screen roller 4 (see FIG. 6 ), each second small chamber 102 is arranged along the nonmagnetic cylindrical screen roller 4 A straight strip type arranged in the axial direction, each second small chamber 102 is connected to the air supply device 10 through its own independent air guiding channel; 3. The air chamber 9 is divided into several interconnected strip chambers 103 Sub-chambers, each sub-chamber is divided into a plurality of first small chambers 101 arranged in the axial direction of the non-magnetic cylindrical screen roller 4 (see Figure 7) or each sub-chamber is separated by a partition A plurality of second small chambers 102 arranged in a row in the circumferential direction of the non-magnetic cylinder screen roller 4, each strip-shaped chamber 103 and the first small chamber 101 or each strip-shaped chamber 103 and the second small chamber The chambers 102 are respectively connected with the air supply device 10 through independent air guide channels. The air chamber 9 , the air supply mechanism and the air supply mode in the above various structural forms can keep the air blown out from the ventilation holes 41 in a good air pressure balance.

Regardless of the above-mentioned structural form, a hollow pipe can be sleeved on the rotating shaft of the non-magnetic cylindrical screen roller 4, and the air supply device 10 and each air guide channel can be connected through the hollow pipe.

The working process of the wind-force dry magnetic separator of the present embodiment is as follows: start the suction fan of the dust removal device 3 and start the dust removal work, start the blower fan of the air supply device 10 and the selected blower fan connected with the selection blowing pipe 15, and the air supply device 10 The wind force is fed into the air chamber 9, and the airflow is ejected through the ventilation holes 41 on the non-magnetic cylindrical screen roller 4, forming an effective composite force field of magnetic force, gravity, wind force and centrifugal force within the effective range of the magnetic system 8. Start the motor of the driving device, and the motor drives the non-magnetic cylindrical screen roller 4 to rotate through the reducer. After the speed is stable, the feeding starts. The belt conveyor sends the material into the feeding device 5, and the material is fed into the feeding device 5 through the feeding device 5 The outer surface of the non-magnetic cylindrical sieve roller 4 is dispersed by the airflow ejected from the ventilation hole 41 at the first time to obtain further loosening, and the magnetic material is attracted by the magnetic force of the magnetic system 8 and moves toward the non-magnetic cylindrical sieve roller 4. The non-magnetic material is blown away from the non-magnetic cylindrical screen roller 4 by the wind force without being caught by the magnetic force. After the material passes through the area of the composite force field, two streams are formed, which are divided into two parts by the material partition plate 14, and one part enters the Part of the concentrate bin 6 enters the tail bin 7, thereby realizing the sorting of materials.

Example 2

The air dry magnetic separator of this embodiment is basically the same as that of Embodiment 1, the difference is that: as shown in Figure 8 and Figure 9, the wind chamber 9 in this embodiment includes the entire inner surface of the non-magnetic cylindrical screen roller 4 The circular chamber arranged around the circumference of the circular chamber is divided into 6 to 90 third small chambers 104 arranged around the circumference of the non-magnetic cylindrical sieve roller 4 by a partition, and each third small chamber 104 Both ends of each are provided with an air guide channel, and the rotating shaft of the non-magnetic cylindrical screen roller 4 is sleeved with a hollow air supply pipe 105 connected with the air supply device 10, and each air guide channel is along the diameter of the non-magnetic cylindrical screen roll 4. Extend to the hollow air supply pipe 105 in the direction and contact the outer surface of the hollow air supply pipe 105. The hollow air supply pipe 105 is provided with a gap. The air channel is connected for air supply. The above-mentioned annular chamber and each air guide channel are fixed on the non-magnetic cylindrical sieve roller 4, wherein the air guide channel can be formed by partitioning.

The advantage of this kind of air supply structure and air supply mode is that: the air chamber 9, the air guide channel and the non-magnetic cylindrical screen roller 4 can be a whole that is fixedly connected to each other, and there is no need to set up a sealing structure, which eliminates the need for sealing conditions due to poor sealing conditions. The problem of low air supply efficiency caused by good performance.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples. For those skilled in the art, improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims (7)

1. A wind-driven dry magnetic separator, including a frame (1), a casing (2), a dust removal device (3) connected to the inner cavity of the casing (2) for ventilation and dust removal, and a dust removal device (3) installed on the casing (2) ) and driven by the driving device to rotate the non-magnetic cylindrical screen roller (4), the feeding device (5) is installed above the non-magnetic cylindrical screen roller (4), the non-magnetic cylindrical screen roller ( 4) is provided with a concentrate bin (6), a tailing bin (7) and a discharge device, which is characterized in that: the roller surface of the non-magnetic cylindrical screen roller (4) is provided with a number of ventilation holes (41) , the non-magnetic cylindrical screen roller (4) is provided with a fixedly installed magnetic system (8), and the non-magnetic cylindrical screen roller (4) is also provided with an air chamber ( 9), the air chamber (9) is connected with an air supply device (10), and the casing (2) is equipped with a non-magnetic cylindrical screen roller ( 4) The baffle plate (11) extending in the direction of rotation, there is a distance between the baffle plate (11) and the outer surface of the non-magnetic cylindrical screen roller (4); the air chamber (9) only Move to the ventilation holes (41) in a fixed area near the outlet of the feeding device (5) for ventilation, and the fixed area is from the outlet of the feeding device (5) along the direction of rotation of the non-magnetic cylindrical screen roller (4) Extend, and the extension length of the fixed area corresponds to the central angle of the non-magnetic cylindrical screen roller (4) is 100°~190°; the wind chamber (9) is fixed on the magnetic system (8) and The magnetic cylindrical screen roller (4) is an arc-shaped air chamber with a thickness of 3mm~6mm in the radial direction, and the gap between the air chamber (9) and the inner surface of the non-magnetic cylindrical screen roller (4) is 3mm~5mm; The air chamber (9) is open toward one end of the inner surface of the non-magnetic cylindrical screen roller (4), and the opening ratio is 30% to 80%; ) with a sealing strip between the inner surfaces; the air chamber (9) is an integral chamber and is connected to the air supply device (10) through an air guide channel; or the air chamber (9) is divided into multiple A first small chamber (101) arranged in the axial direction of the non-magnetic cylindrical sieve roller (4), each first small chamber (101) passes through its own independent air guide channel and air supply device (10 ) connected; or the air chamber (9) is divided into a plurality of second small chambers (102) arranged in the circumferential direction of the non-magnetic cylindrical screen roller (4) through a partition, and each second small chamber ( 102) are respectively connected to the air supply device (10) through independent air guide channels; or the air chamber (9) is divided into several sub-chambers by a plurality of interconnected strip-shaped chambers (103), and each sub-chamber The chamber is divided into multiple first small chambers (101) arranged in the axial direction of the non-magnetic cylindrical screen roller (4) or multiple first small chambers arranged in the circumferential direction of the non-magnetic cylindrical screen roller (4) by partitions The arranged second small chambers (102), each strip-shaped chamber (103) and the first small chamber (101) or each strip-shaped chamber (103) and the second small chamber (102) pass through their respective Independent air guide channel and air supply device (1 0) connected. 2. The wind-driven dry-type magnetic separator according to claim 1, characterized in that: the side of the baffle plate (11) facing the non-magnetic cylindrical screen roller (4) is provided with several vertical plates arranged at intervals (12), each vertical plate (12) is arranged along the axial direction of the non-magnetic cylindrical screen roller (4). 3. The air dry magnetic separator according to claim 1, characterized in that: the distance between the baffle plate (11) and the outer surface of the non-magnetic cylindrical screen roller (4) is 10mm~300mm , the extension length of the baffle plate (11) corresponding to the central angle of the non-magnetic cylindrical screen roller (4) is 5°-45°. 4. The wind-driven dry-type magnetic separator according to claim 1, characterized in that: the discharge port of the feeding device (5) is connected to the outer surface of the non-magnetic cylindrical screen roller (4). The wind-blocking baffle (13), the wind-blocking baffle (13) and the material baffle (11) are respectively arranged on both sides of the discharge port of the feeding device (5). 5. The air-driven dry magnetic separator according to claim 1, characterized in that: the aperture of the ventilation hole (41) gradually decreases along the radially outward direction of the non-magnetic cylindrical screen roller (4), The roll surface opening ratio of the non-magnetic cylindrical screen roll (4) is 1%-20%. 6. The air dry magnetic separator according to claim 1, characterized in that: the unloading device includes a material separation plate (14) and a selection blowing pipe (15), and the material separation plate (14) Installed between the fine material bin (6) and the tailing material bin (7) in an adjustable rotation angle, the angle adjustment range of the material dividing plate (14) is ±40°; the selection The blowing pipe (15) is installed above the fine material bin (6) in an adjustable manner for the air supply angle. 7. The air dry magnetic separator according to claim 1, characterized in that: the air chamber (9) includes an annular chamber arranged along the circumference of the entire inner surface of the non-magnetic cylindrical screen roller (4), The annular chamber is divided into a number of third small chambers (104) arranged around the circumference of the non-magnetic cylindrical sieve roller (4) through partitions, and both ends of each third small chamber (104) are provided with There is an air guide channel, and a hollow air supply pipe (105) connected to the air supply device (10) is sleeved on the rotating shaft of the non-magnetic cylindrical screen roller (4). The radial direction of (4) extends to the hollow air supply pipe (105) and is in contact with the outer surface of the hollow air supply pipe (105), and the hollow air supply pipe (105) is opened with a The vents (41) communicate with the gap of the air-guiding channel for air supply.