CN216261247U - Dry-method ore dressing system - Google Patents

Abstract

The utility model relates to a dry beneficiation system, comprising: the crushing and pulverizing equipment is provided with a first material inlet and a first material outlet and comprises a crushing and pulverizing structure for pulverizing the pretreated ore material in a crushing mode; and the second magnetic separator is positioned at the downstream of the crushing powder manufacturing equipment and used for separating mineral powder materials processed by the crushing powder manufacturing equipment, and the second magnetic separator is provided with a second feed inlet, a second concentrate discharge hole and a second tailing discharge hole, and the second feed inlet of the second magnetic separator is connected with the first material outlet of the crushing powder manufacturing equipment. The crushing and powder making form is adopted, so that the materials and the materials are subjected to mutual impact friction, the mineral malts and metals are effectively dissociated, the integrity of crystal particles is kept, the over-grinding problem of the ore materials is effectively reduced, and the qualified grade can be selected after the crushed and powder made materials enter the second magnetic separator.

Description

Dry-method ore dressing system

Technical Field

The utility model relates to the technical field of magnetic material sorting, in particular to a dry-method mineral separation system.

Background

The existing magnetic mineral separation method comprises a wet separation process and a dry separation process. The wet beneficiation needs a large amount of water in the levigating process, the beneficiation method has high requirement on water resources in a mining area, and water consumption in the beneficiation process is large, so that waste of the water resources is caused. A dry-method ore dressing process, as the name suggests, does not need to add a large amount of water in the process of grinding, for example, the utility model patent of China with the application number of CN201610093801.6 (the publication number of CN105983475A) applies for a high-pressure roller mill crushing system for magnet mines, which comprises a gyratory crusher, a vibrating screen, a cone crusher, a conveying belt, a high-pressure roller mill, a strong-magnetic dry separator, a weak-magnetic dry separator and a lifter.

However, in the dry separation process, when dry grinding is performed, powder making equipment usually adopts a Raymond mill, a ball mill, a high-pressure counter roll, a high-pressure roller mill and a vertical mill, and the powder making equipment has high requirements on the moisture of materials, can make powder only by controlling the moisture to be 2-3%, and has high requirements on the production environment. In addition, the crushing of the materials is realized by the extrusion and the friction of the materials and the wear-resistant materials, so that the consumption of consumable materials of the equipment is large, particularly, the powder-making equipment takes the finest particle size of the minerals as the dissociation standard to realize the grade and the recovery rate of the minerals, but because the crystal particles of the minerals are unequal and the minerals are dissociated in the finest particle size, the limit of ore grinding is increased, and the over-grinding phenomenon of coarse particle crystals occurs, so that the problems of over-grinding and insufficient dissociation are difficult to solve.

Therefore, the existing dry beneficiation system needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a dry-method ore dressing system which can effectively reduce the over-grinding problem and improve the ore dressing grade so as to simplify the whole ore dressing process.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a dry beneficiation system, comprising:

the crushing and pulverizing equipment is provided with a first material inlet and a first material outlet and comprises a crushing and pulverizing structure for pulverizing the pretreated ore material in a crushing mode;

and the second magnetic separator is positioned at the downstream of the crushing powder manufacturing equipment and used for separating mineral powder materials processed by the crushing powder manufacturing equipment, and the second magnetic separator is provided with a second feed inlet, a second concentrate discharge hole and a second tailing discharge hole, and the second feed inlet of the second magnetic separator is connected with the first material outlet of the crushing powder manufacturing equipment.

As the improvement, still including being used for carrying out the first magnet separator of elementary separation to the ore material after the completion of the preliminary crushing treatment, it has first feed inlet and first concentrate discharge gate and first tailing discharge gate, the first concentrate discharge gate of first magnet separator with broken powder process equipment's first material import links to each other, the second tailing discharge gate of second magnet separator with the first feed inlet of first magnet separator links to each other. If the grade of the ore material after the pre-crushing treatment in the previous process is relatively low, the ore material can be enriched by the first magnetic separator, and the ore material enters crushing and powder making equipment for crushing and powder making after primary separation; of course, if the grade of the ore material after the pre-crushing treatment in the previous process is relatively high, the first magnetic separator can be omitted, and the ore material directly enters the crushing and pulverizing equipment for crushing and pulverizing.

In order to further improve the powder selection grade of a second magnetic separator in the subsequent process, the magnetic separator further comprises a powder selecting machine which is arranged between the crushing and powder preparing device and the second magnetic separator, wherein the powder selecting machine is provided with a second material inlet and a second material outlet, the second material inlet is connected with the first material outlet, and the second material outlet is connected with a second feeding hole of the second magnetic separator. Compared with the conventional method of screening powder by adopting a vibrating screen in the prior art, the powder screening machine can more effectively control the fineness of materials and better meet the requirement of subsequent magnetic separation. Certainly, some minerals are relatively coarse in embedded particle size, the crushing powder-making equipment can meet the mineral separation requirement once, and the powder separator can be omitted. The powder concentrator is further improved, the powder concentration effect is improved, and the powder concentrator is a vortex powder concentrator.

In order to recycle the coarse materials generated by the powder concentrator, the powder concentrator is also provided with a coarse material outlet which is connected with the first magnetic separator.

In order to avoid the problem of material accumulation or insufficient supply, the continuous feeding is realized, and the continuous feeding device further comprises a storage bin, wherein the storage bin is positioned between the first magnetic separator and the crushing powder making equipment and is used for receiving ore materials subjected to primary separation by the first magnetic separator.

In order to realize continuous and stable feeding among the devices, lifting machines for conveying ore materials are arranged between the first magnetic separator and the stock bin, between the stock bin and the crushing and powder making device, between the crushing and powder making device and the powder selecting machine and between the powder selecting machine and the second magnetic separator.

In order to effectively separate the fine dust and improve the ore dressing grade, the second magnetic separator is also provided with a wind power separation assisting device.

In order to further improve the efficiency of pulverizing in a pulverized form, the pulverized coal pulverizing equipment comprises:

a housing having an accommodating chamber;

the first driving piece is arranged on the shell and is provided with a first rotating shaft vertically extending into the accommodating cavity;

the second driving piece is arranged on the shell and is provided with a second rotating shaft vertically extending into the accommodating cavity, the first rotating shaft and the second rotating shaft are coaxially arranged and are positioned on the inner side of the first rotating shaft, and the second rotating shaft and the first rotating shaft independently rotate;

the impact rotating disc is arranged in the accommodating cavity, is connected with the first rotating shaft and can rotate along with the first rotating shaft, first hammer heads are distributed on the impact rotating disc at intervals along the circumferential direction of the impact rotating disc, and a gap is reserved between the impact rotating disc and the top of the accommodating cavity, so that a first crushing cavity is formed;

the impact rotating disc is arranged in the accommodating cavity, is positioned below the impact rotating disc and is connected with the second rotating shaft so as to rotate along with the second rotating shaft, the impact rotating disc and the impact rotating disc are arranged at intervals and define a second crushing cavity together with the inner peripheral wall of the shell, the top of the impact rotating disc is provided with a cavity with an opening facing the impact rotating disc, and the cavity is internally provided with an impact plate component used for pulling out ore materials falling into the cavity towards the impact rotating disc;

the impact rotary disc and the impact rotary disc jointly form the crushing and pulverizing structure.

The impact rotating disc can upwards throw up the ore material that falls into at the rotation in-process and cooperate with the impact rotating disc of top, realizes the impact breakage repeatedly of material, has guaranteed the effect of broken powder process. The crushing opposite-punching powder making machine can make the material and the material mutually oppositely rub, so that the mineral maltite and the metal are effectively dissociated, and the integrity of the crystal particles is kept.

In order to guarantee that the material can be thrown upwards rapidly effectively on falling into the counterattack rolling disc, the cavity wholly is big-end-up, and uses the second pivot is the radius platform form of axis, counterattack board subassembly includes the edge the counterattack board that the circumferencial direction interval of the diapire of cavity set up, each counterattack board certainly the diapire of cavity upwards inclines in the circumferencial direction of cavity.

In order to further improve the opposite impact effect of the materials in the second crushing cavity and improve the powder making efficiency, the rotating directions of the first rotating shaft and the second rotating shaft are opposite, so that the rotating directions of the impact rotating disc and the counter-impact rotating disc are also opposite.

As an improvement, the shell is provided with a first material inlet at the top and a first material outlet at the bottom, the first material inlet is communicated with the first crushing cavity, and the first material outlet is communicated with the second crushing cavity.

Compared with the prior art, the utility model has the advantages that: the ore material after the pretreatment is processed is pulverized in a crushing mode through crushing pulverizing equipment, wherein the crushing pulverizing mode is adopted, so that the material and the material are subjected to mutual impact friction, the mineral wheat stone and metal are effectively dissociated, the integrity of crystalline particles is kept, the problem of excessive grinding of the ore material is effectively reduced, and the qualified grade can be selected after the crushed pulverized material enters a second magnetic separator. In the preferred scheme, the ore materials after the pre-crushing treatment is finished are primarily sorted by the first magnetic separator, then are crushed and milled by the crushing and milling equipment, and finally enter the second magnetic separator and then are qualified, wherein the minerals which are not dissociated can circularly enter the first magnetic separator and are continuously crushed by the subsequent crushing and milling equipment, so that the automatic circulating production flow is formed. The dry-method mineral separation system combines the form of crushing and pulverizing, effectively reduces the problem of over-grinding of materials, improves the mineral grade and effectively simplifies the whole mineral separation process.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a crushing and pulverizing apparatus according to an embodiment of the present invention;

FIG. 3 is a vertical cross-sectional view of FIG. 2;

FIG. 4 is a schematic perspective view of FIG. 2 with the housing omitted;

fig. 5 is a schematic perspective view of a reaction rotary disk of a crushing powder making device according to an embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1-5, a dry beneficiation system includes a first magnetic separator 10, a bin 30, a crushing and pulverizing device 20, a powder concentrator 50, a second magnetic separator 40, and a hoist 31.

Referring to fig. 1, a first magnetic separator 10 has a first feed port 11, a first concentrate discharge port 12 and a first tailings discharge port 13, and is used for primary separation of ore materials after the pre-crushing treatment is completed. The term "ore material after the pre-crushing treatment" refers to ore material (i.e. ore material) with a size of substantially less than 5 mm, which is obtained by conventional crushing equipment, and the ore material enters the first magnetic separator 10 through the first feed opening 11 for primary separation. The first magnetic separator 10 adopts a conventional dry separation magnetic separator, the dry separation magnetic separator adopts gradient magnetic field arrangement, minerals roll in a magnetic field during the operation of equipment, and wheat stones are thrown out under the action of centrifugal force through the adjustment of the rotating speed of the equipment, so that the purpose of improving the grade is achieved. The first magnetic separator 10 of this embodiment can be designed to have a magnetic field ranging from 2500 gauss to 8000 gauss, depending on the materials.

With continued reference to FIG. 1, a silo 30 is located downstream of the first magnetic separator 10 for receiving ore material primarily sorted by the first magnetic separator 10. Ore material is conveyed between the first magnetic separator 10 and the bin 30 through the elevator 31.

The crushing and pulverizing equipment 20 is located downstream of the first magnetic separator 10 and has a first material inlet 201 and a first material outlet 202, wherein the first material inlet 201 is connectable to the first concentrate outlet 12 of the first magnetic separator 10, and preferably, is adapted to be connected to the bin 30.

An important inventive point of the utility model is that: the applicant finds that in a dry-method mineral separation system, the crushing equipment is used for pulverizing in a crushing mode, so that materials and materials can be subjected to mutual impact friction, the mineral maltite and metal can be effectively dissociated (the mineral embedded particle size is effectively dissociated), the integrity of crystalline particles is maintained, and the dry separation grade is effectively improved. Through a large number of tests, the applicant conducts powder-making and mineral-dressing tests on various crushing devices, and finds that after various existing crushing devices such as a vertical shaft sand making machine, a counterattack sand making machine, an impact sand making machine, a counterattack flour mill and the like make powder in a crushing mode, the minerals can be effectively dissociated and the grade of the minerals is improved. The crushing and pulverizing equipment 20 of the present embodiment is preferably a opposed jet mill, and the structure of the opposed jet mill is described below.

The broken powder process equipment 20 (towards milling machine) of this embodiment is including broken powder process structure, can carry out the powder process with broken form to the ore material after first magnet separator 10 is elementary selected separately through this broken powder process structure. The crushing mill 20 comprises a housing 21, a first driving member 22, a second driving member 23, an impact turning disc 24 and an impact turning disc 25, wherein the impact turning disc 25 and the impact turning disc 24 together form the crushing mill structure described above, and are shown in detail in fig. 2-5.

Referring to fig. 3, the housing 21 is a vertically arranged cylindrical structure having a receiving cavity 210. The housing has a first material inlet 201 at the top and a first material outlet 202 at the bottom, the first material inlet 201 communicating with the first crushing chamber 26 and the first material outlet 202 communicating with the second crushing chamber 27, wherein the first crushing chamber 26 and the second crushing chamber 27 are described below.

The first driving member 22 and the second driving member 23 are only disposed at the top of the housing 21, wherein the first driving member 22 has a first rotating shaft 221 vertically extending into the accommodating cavity 210, and the second driving member 23 has a second rotating shaft 231 vertically extending into the accommodating cavity 210. The first driving member 22 and the second driving member 23 can both adopt a belt pulley transmission mechanism driven by a driving motor, and a belt pulley of the belt pulley transmission mechanism can be respectively coaxially connected with the corresponding first rotating shaft 221 and the second rotating shaft 231. In the present embodiment, the first rotating shaft 221 and the second rotating shaft 231 are coaxially disposed and located inside the first rotating shaft 221, and the second rotating shaft 231 and the first rotating shaft 221 rotate independently, specifically, a bearing piece may be disposed between the first rotating shaft 221 and the second rotating shaft 231 to realize independent rotation, and the transmission shaft structure of the independent movement of the two shafts is a "main shaft" structure disclosed in "a rotating disc mechanism and a crusher for an impact crusher" with application number of cn201721555537.

The impact rotary disk 24 and the reaction rotary disk 25 are both arranged in the accommodating cavity 210 and are respectively arranged in the accommodating cavity 210 at intervals up and down. Specifically, the impact rotary disk 24 is connected to the first rotary shaft 221 to be rotatable with the first rotary shaft 221 with a gap between the impact rotary disk 24 and the top of the receiving chamber 210, thereby forming the first crushing chamber 26. Wherein, it has first tup 240 to distribute along its circumference interval on the impact rotating disk 24, and when the impact rotating disk 24 rotated, first tup 240 that distributes on it can realize the breakage to the material with the inner wall (specifically the fluted disc that has the tooth's socket) cooperation of casing 21.

The impact rotary disk 25 is located below the impact rotary disk 24, is connected with the second rotating shaft 231 and can rotate along with the second rotating shaft 231, the impact rotary disk 25 and the impact rotary disk 24 are arranged at intervals, and the impact rotary disk 25 and the inner peripheral wall of the shell 21 jointly define a second crushing cavity 27. The second hammers 250 are distributed on the impact rotating disc 25 at intervals along the circumferential direction of the impact rotating disc, and when the impact rotating disc 24 rotates, the second hammers 250 distributed on the impact rotating disc can be matched with the inner wall (specifically, a fluted disc with tooth grooves) of the shell 21 and the bottom wall of the impact rotating disc 24 to crush materials. Furthermore, the top of the reaction rotor 25 has a cavity 251 open towards the impact rotor 24, wherein the cavity 251 has a reaction plate assembly therein for pulling ore material falling into the cavity 251 towards the impact rotor 24. Specifically, the cavity 251 is formed in a rounded truncated cone shape having a large upper portion and a small lower portion as a whole and having the second rotation shaft 231 as an axis, the reaction plate assembly includes reaction plates 28 provided at intervals in a circumferential direction of a bottom wall of the cavity 251, and each of the reaction plates 28 is inclined upward from the bottom wall of the cavity 251 in the circumferential direction of the cavity 251. The impact rotating disc 25 can rapidly and effectively throw out materials falling onto the impact rotating disc 25 upwards in the rotating process, so that repeated impact crushing of the materials is realized, and the effect of crushing and pulverizing is ensured. The crushing opposite-punching powder making machine can make the material and the material mutually oppositely rub, so that the mineral maltite and the metal are effectively dissociated, and the integrity of the crystal particles is kept.

Referring to fig. 4, the first rotating shaft 221 and the second rotating shaft 231 of the present embodiment rotate in opposite directions, that is, the impact rotating disk 24 and the reaction rotating disk 25 rotate in opposite directions. The opposite rotating directions of the impact rotating disc 24 and the counter-impact rotating disc 25 are designed to further improve the opposite impact effect of the materials in the second crushing cavity 27, and the powder making efficiency is improved.

Referring to fig. 1, the powder concentrator 50 is disposed between the crushing and pulverizing device 20 and the second magnetic separator 40, wherein the powder concentrator 50 has a second material inlet 51, a second material outlet 52 and a coarse material outlet 53, the second material inlet 51 is connected to the first material outlet 202, the second material outlet 52 is connected to the second feed inlet 41 of the second magnetic separator 40, and the coarse material outlet 53 is connected to the first magnetic separator 10, so as to send the coarse material generated by the powder concentrator 50 into the first magnetic separator 10, thereby realizing recycling. Compared with the conventional method of screening powder by using a vibrating screen in the prior art, the powder separator 50 can effectively control the fineness of materials, improve the screening output, better meet the requirement of subsequent magnetic separation and further improve the powder separation grade of the second magnetic separator 40 in the subsequent process. The powder concentrator 50 of this embodiment is preferably a vortex powder concentrator 50, such as a Sepax high efficiency jida vortex powder concentrator 50 product available from jiangsu jida machinery manufacturing limited.

The second magnetic separator 40 is located downstream of the mill 50 and has a second feed inlet 41 and a second concentrate discharge 42 and a second tailings discharge 43. The second feed inlet 41 of the second magnetic separator 40 is connected with the first material outlet 202 of the crushing powder making device 20, and the second tailing discharge outlet 43 of the second magnetic separator 40 is connected with the first magnetic separator 10. In the embodiment, the first magnetic separator 10 is provided with the tailings for discharging, the tailing running is controlled, the second magnetic separator 40 is provided with the concentrate for discharging, and the qualified grade is controlled, wherein the tailings of the second magnetic separator 40 are returned to the first magnetic separator 10 to control the tailing running. The magnetic field range designed by the second magnetic separator 40 is 1000 to 4000 gausses, and the magnetic field range is used for finely separating the mineral powder materials processed by the crushing and pulverizing equipment 20 and subjected to powder separation by the powder separator 50. According to the current process design, the concentrate grade of 60-67 percent can be selected according to different ore material specifications, and the range of the magnetic iron is controlled to be 0.5-1.

The second magnetic separator 40 of this embodiment adopts gradient magnetic field arrangement, and the mineral rolls in the magnetic field during equipment operation, through equipment rotational speed adjustment, throws out the wheat stone under the effect of centrifugal force, reaches the purpose that improves the grade to install wind power selection-assisting equipment on the preparator, make fine dust effective separation, wherein, the magnetic separator structure and the theory of operation that have wind power selection-assisting equipment are prior art, no longer describe repeatedly. In addition, in order to avoid the dust pollution caused by the operation of the first magnetic separator 10 and the second magnetic separator 40, the first magnetic separator 10 and the second magnetic separator 40 are further connected with a dust removal device 60, preferably, the first magnetic separator 10 and the second magnetic separator 40 of the embodiment are connected with the same dust removal device 60, wherein the dust removal device can adopt various existing dust removers.

The working flow of the dry beneficiation system of the embodiment is as follows:

referring to fig. 1, the ore material after the pre-crushing treatment enters a first magnetic separator 10 for primary separation to improve grade, the ore material after the primary separation enters a bin 30, the tailing discharge is controlled simultaneously, tailings are discharged, then the raw material in the bin 30 is metered and fed to a crushing powder making device 20, the crushing powder making device 20 performs hedging powder making in a crushing mode to make mineral powder meeting the metal dissociation, then a powder selecting machine 50 performs powder selection, and finally the mineral powder enters a second magnetic separator 40 for secondary selection to select qualified grade and separate qualified fine powder, wherein the minerals (unqualified ore materials) which are not dissociated circularly enter the first magnetic separator 10 and are continuously crushed by a subsequent crushing device 20, so that an automatic circulating production process is formed. The dry-method mineral separation system combines the form of crushing and pulverizing, effectively reduces the problem of over-grinding of materials, and improves the mineral grade, thereby effectively simplifying the whole mineral separation process.

The dry beneficiation system of the embodiment can be used for magnetite beneficiation, such as: magnetite, vanadium titano-magnetite, delafossite, pyrite and other associated minerals associated with magnetite.

Claims (9)

1. A dry beneficiation system, characterized by comprising:

the crushing and pulverizing equipment (20) is provided with a first material inlet (201) and a first material outlet (202) and comprises a crushing and pulverizing structure for pulverizing the pretreated ore material in a crushing mode;

the second magnetic separator (40) is positioned at the downstream of the crushing and pulverizing equipment (20) and is used for separating the mineral powder materials processed by the crushing and pulverizing equipment (20), the second magnetic separator is provided with a second feeding hole (41), a second concentrate discharging hole (42) and a second tailing discharging hole (43), and the second feeding hole (41) of the second magnetic separator (40) is connected with the first material outlet (202) of the crushing and pulverizing equipment (20);

the crushing pulverizing apparatus (20) comprises:

a housing (21) having an accommodation chamber (210);

the first driving piece (22) is arranged on the shell (21) and is provided with a first rotating shaft (221) vertically extending into the accommodating cavity (210);

the second driving piece (23) is arranged on the shell (21) and is provided with a second rotating shaft (231) vertically extending into the accommodating cavity (210), the first rotating shaft (221) and the second rotating shaft (231) are coaxially arranged and are positioned on the inner side of the first rotating shaft (221), and the second rotating shaft (231) and the first rotating shaft (221) independently rotate;

the impact rotating disc (24) is arranged in the accommodating cavity (210), is connected with the first rotating shaft (221) and can rotate along with the first rotating shaft (221), first hammer heads (240) are distributed on the impact rotating disc (24) at intervals along the circumferential direction of the impact rotating disc, and a gap is reserved between the impact rotating disc (24) and the top of the accommodating cavity (210), so that a first crushing cavity (26) is formed;

the impact rotating disc (25) is arranged in the accommodating cavity (210), is positioned below the impact rotating disc (24), is connected with the second rotating shaft (231) and can rotate along with the second rotating shaft (231), is arranged at an interval with the impact rotating disc (24), and defines a second crushing cavity (27) together with the inner peripheral wall of the shell (21), the top of the impact rotating disc (25) is provided with a cavity (251) which is opened towards the impact rotating disc (24), and the cavity (251) is internally provided with an impact plate assembly used for pulling out ore materials falling into the cavity (251) towards the impact rotating disc (24);

the impact rotating disc (24) and the impact rotating disc (25) jointly form the crushing and pulverizing structure.

2. The dry beneficiation system according to claim 1, wherein: still including being used for carrying out the first magnet separator (10) of elementary separation to the ore material after the completion of pre-crushing treatment, it has first feed inlet (11) and first concentrate discharge gate (12) and first tailing discharge gate (13), first concentrate discharge gate (12) of first magnet separator (10) with first material import (201) of broken powder process equipment (20) link to each other, second tailing discharge gate (43) of second magnet separator (40) with first feed inlet (11) of first magnet separator (10) link to each other.

3. The dry beneficiation system according to claim 2, wherein: the magnetic separator is characterized by further comprising a powder concentrator (50) arranged between the crushing powder-making equipment (20) and the second magnetic separator (40), wherein the powder concentrator (50) is provided with a second material inlet (51) and a second material outlet (52), the second material inlet (51) is connected with the first material outlet (202), and the second material outlet (52) is connected with a second feeding hole (41) of the second magnetic separator (40).

4. The dry beneficiation system according to claim 3, wherein: the powder concentrator (50) is also provided with a coarse material outlet (53), and the coarse material outlet (53) is connected with the first magnetic separator (10).

5. The dry beneficiation system according to claim 3, wherein: still include feed bin (30), be located first magnet separator (10) with between broken powder process equipment (20), be used for receiving the warp the ore material after first magnet separator (10) elementary separation.

6. The dry beneficiation system according to claim 5, wherein: the first magnetic separator (10) and the bunker (30), the bunker (30) and the crushing powder-making equipment (20), the crushing powder-making equipment (20) and the powder selecting machine (50) and the second magnetic separator (40) are all provided with a lifting machine (31) used for conveying ore materials.

7. The dry beneficiation system according to any one of claims 1 to 6, wherein: the cavity (251) is in a shape of an inverted circular truncated cone with a large upper part and a small lower part and taking the second rotating shaft (231) as an axis, the impact plate assembly comprises impact plates (28) arranged at intervals along the circumferential direction of the bottom wall of the cavity (251), and each impact plate (28) inclines upwards from the bottom wall of the cavity (251) in the circumferential direction of the cavity (251).

8. The dry beneficiation system according to claim 7, wherein: the first rotating shaft (221) and the second rotating shaft (231) rotate in opposite directions, so that the impact rotating disc (24) and the reaction rotating disc (25) rotate in opposite directions.

9. The dry beneficiation system according to claim 7, wherein: the shell is provided with a first material inlet (201) at the top and a first material outlet (202) at the bottom, the first material inlet (201) is communicated with the first crushing cavity (26), and the first material outlet (202) is communicated with the second crushing cavity (27).

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