A fully automatic coal flow rapid separation gangue in-situ filling system and filling method

Abstract

The application discloses a kind of full-automatic coal flow quick separation gangue in-situ filling system and filling method, and filling system includes: heavy medium separator, selected clean coal conveyor, selected gangue conveyor, goaf gangue conveyor and rear filling conveying equipment;The feed inlet of heavy medium separator is located below the external raw coal crusher;The conveying belt of selected clean coal conveyor is located near the top of heavy medium separator;The conveying belt of selected gangue conveyor is located near the bottom of heavy medium separator;The discharge end of goaf gangue conveyor is located above the feed end of rear filling conveying equipment, and the discharge end of rear filling conveying equipment is located above goaf.The raw coal and gangue of raw coal flow are quickly separated from the mining source, and the separated gangue is directly conveyed to goaf for in-situ filling, which realizes gangue separation and local treatment, reduces the pollution to the ground environment, surface subsidence, and reduces the production and transportation cost of mine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal gangue treatment, and particularly relates to a full-automatic coal flow rapid separation gangue in-situ filling system and a filling method. BACKGROUND

[0002] Gangue not rising to the shaft is an important symbol of modern green mining of coal. Coal is the main energy and consumption resource in China, and with the accelerated pace of development and construction of national coal bases, 770 million tons of coal gangue needs to be discharged every year. In the mining process, a large amount of gangue is accumulated, which not only destroys good farmland, but also speeds up the environmental pollution of the mining area and increases the cost of raw coal production and transportation. For many years, the amount of accumulated coal gangue is huge, and the spontaneous combustion and explosion of gangue cause serious safety hazards, and there is no device in the existing technology to effectively treat gangue. SUMMARY

[0003] In order to solve the above problems existing in the prior art, the present application provides a full-automatic coal flow rapid separation gangue in-situ filling system and a filling method. The technical problem to be solved by the present application is realized by the following technical scheme:

[0004] The first aspect of the embodiment of the present application provides a full-automatic coal flow rapid separation gangue in-situ filling system, comprising: a dense medium separator, a selected clean coal conveyor, a selected gangue conveyor, a goaf gangue conveyor and a backfilling conveying device;

[0005] The feed inlet of the dense medium separator is located below the external raw coal crusher;

[0006] The conveying belt of the selected clean coal conveyor is located near the top of the dense medium separator;

[0007] One end of the conveying belt of the selected clean coal conveyor is located on one side of the raw coal crusher, and the other end extends to above the feed end of the rubber transport trough conveyor outside the dense medium separator along the long axis of the top of the dense medium separator;

[0008] The conveying belt of the selected gangue conveyor is located near the bottom of the dense medium separator and extends along the long axis of the bottom of the dense medium separator;

[0009] One end of the conveying belt of the selected gangue conveyor passes through the dense medium separator and is located above the feed end of the goaf gangue conveyor, and the other end extends to the end inside the dense medium separator;

[0010] The discharge end of the goaf gangue conveyor is located above the feed end of the backfilling conveying device, and the discharge end of the backfilling conveying device is located above the goaf.

[0011] In an embodiment of the present application, further comprising: a heavy medium storage tank, a heavy medium monitor, a camera and a heavy medium pumping pump;

[0012] The heavy medium monitor is fixedly arranged in the heavy medium separator.

[0013] The camera is fixedly arranged above the heavy medium separator.

[0014] The heavy medium pumping pump has one end in the heavy medium storage tank and the other end in the heavy medium separator.

[0015] The heavy medium storage tank is arranged on one side outside the heavy medium separator.

[0016] In an embodiment of the present application, the post-rack filling conveying device comprises a post-rack filling conveyor and a rotary transfer device.

[0017] The rotating part of the rotary transfer device is fixedly connected with the conveying belt of the feed end of the post-rack filling conveyor.

[0018] In an embodiment of the present application, the rotary transfer device comprises a driving motor and a rotating part.

[0019] The output shaft of the driving motor is fixedly connected with the conveying surface of the post-rack filling conveyor and the rotating part.

[0020] In an embodiment of the present application, a plurality of filling molds are arranged in the goaf.

[0021] The filling mold comprises a stone mound body filling mold, a wall body filling mold, a dam body filling mold or a column body filling mold.

[0022] The second aspect of the embodiment of the present application provides a full-automatic coal flow rapid separation gangue in-situ filling method, which is applied to the full-automatic coal flow rapid separation gangue in-situ filling system provided in the first aspect of the embodiment of the present application, and comprises the following steps:

[0023] Step one: the broken raw coal in the raw coal crusher falls into the heavy medium separator for screening treatment; wherein, the clean coal moves upward to the surface close to the liquid screening medium in the heavy medium separator to fall onto the conveying belt of the clean coal separating conveyor, the gangue moves downward to the bottom close to the liquid screening medium to fall onto the conveying belt of the gangue separating conveyor, and the coal and gangue separation screening is completed.

[0024] Step two: the clean coal separating conveyor conveys the clean coal to the feed end of the rubber belt conveying chute conveyor, and the rubber belt conveying chute conveyor conveys the clean coal to the ground.

[0025] Step three, the gangue conveyor in the goaf conveys the gangue to the feeding end of the backfill conveying device, and the backfill conveying device conveys the gangue to the filling mold in the goaf for filling.

[0026] In one embodiment of the present application, further comprising:

[0027] The heavy medium monitoring instrument monitors the parameters of the liquid screening medium in the heavy medium separator, and sends the monitoring data to the external automatic control system, and the automatic control system controls the heavy medium drainage pump to work according to the received monitoring data.

[0028] The beneficial effects of the present application are:

[0029] The present application realizes the separation of gangue from raw coal at the source of mining, and directly transports the separated gangue to the goaf for in-situ backfilling, realizes the separation of gangue with mining, and treats the coal-gangue solid waste on site, effectively solves the problem of a large amount of gangue treatment. The gangue is directly used for backfilling the goaf, reduces the amount of gangue ascending the shaft, reduces the pollution, occupation and surface subsidence of the ground environment, reduces the production and transportation cost of the mine, and realizes green mining without gangue ascending the shaft.

[0030] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the heavy medium separator, the clean coal conveying device, the gangue conveying device and the goaf gangue conveying device provided by the embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of the goaf gangue conveying device and the backfill conveying device provided by the embodiment of the present application;

[0033] Figure 3 is a schematic diagram of a top view of Figure 1 ;

[0034] Figure 4 is a top view of the backfill conveying device provided by the embodiment of the present application;

[0035] Figure 5 is a structural schematic diagram of the gangue mound provided by the embodiment of the present application;

[0036] Figure 6 is a structural schematic diagram of the gangue wall provided by the embodiment of the present application;

[0037] Figure 7 is a structural schematic diagram of the gangue dam provided by the embodiment of the present application;

[0038] Figure 8 is a structural schematic diagram of the gangue column provided by the embodiment of the present application;

[0039] Figure 9 is a working state schematic diagram of a filling wall body filling mold of a full-automatic coal flow rapid separation gangue in-situ filling system provided by an embodiment of the present application;

[0040] Figure 10 is a working state schematic diagram of a filling stone pier body filling mold of another full-automatic coal flow rapid separation gangue in-situ filling system provided by an embodiment of the present application.

[0041] Legend:

[0042] 10 - dense medium separator; 11 - liquid screening medium; 12 - dense medium liquid storage tank; 13 - dense medium liquid monitor; 14 - camera; 15 - dense medium liquid pumping pump; 20 - clean coal conveying machine; 30 - gangue conveying machine; 40 - goaf gangue conveying machine; 50 - backfilling conveying equipment; 51 - backfilling conveying machine; 52 - rotating transfer device; 60 - raw coal crusher; 70 - scraper conveyor; 81 - gangue pier; 82 - gangue wall; 83 - gangue dam; 84 - gangue column; 90 - rubber transport chute conveyor. DETAILED DESCRIPTION

[0043] The present application will be further described in conjunction with specific embodiments, but the embodiments of the present application are not limited thereto.

[0044] As shown in Figure 1 , Figure 2 and Figure 3 , a full-automatic coal flow rapid separation gangue in-situ filling system comprises a dense medium separator 10, a clean coal conveying machine 20, a gangue conveying machine 30, a goaf gangue conveying machine 40 and backfilling conveying equipment 50.

[0045] Raw coal is mined by a coal mining machine and is crushed by a raw coal crusher 60 and then falls into a raw coal separation screen of the dense medium separator 10 for screening treatment. A scraper conveyor 70 is further arranged above the raw coal crusher 60 to convey raw coal into the raw coal crusher 60. A feed inlet of the dense medium separator 10 is located below the external raw coal crusher 60. The dense medium separator 10 is filled with a liquid screening medium 11, and the density of the liquid screening medium 11 is between that of raw coal and gangue (i.e. the density is greater than that of raw coal but less than that of gangue). Coal and gangue falling into the dense medium separator 10 will float on the surface of the screening liquid due to the different densities, and the gangue will sink to the bottom of the liquid screening medium 11.

[0046] The conveying belt of the sorted clean coal conveyor 20 is located near the top of the dense medium separator 10. One end of the conveying belt of the sorted clean coal conveyor 20 is located at one side of the raw coal crusher 60, and the other end of the conveying belt of the sorted clean coal conveyor 20 extends along the long axis of the top of the dense medium separator 10 to above the feed end of the rubberized in-pit conveyor 90 outside the dense medium separator 10. When sorting in the dense medium separator 10, the coal falls onto the conveying belt of the sorted clean coal conveyor 20 and is conveyed to the rubberized in-pit conveyor 90 and then to the ground.

[0047] The conveying belt of the sorted gangue conveyor 30 is located near the bottom of the dense medium separator 10 and extends along the long axis of the bottom of the dense medium separator 10. One end of the conveying belt of the sorted gangue conveyor 30 extends out of the dense medium separator 10 and is located above the feed end of the goaf gangue conveyor 40, and the other end of the conveying belt of the sorted gangue conveyor 30 extends to the end inside the dense medium separator 10; when sorting in the dense medium separator 10, the gangue falls onto the conveying belt of the sorted gangue conveyor 30 at the bottom and is conveyed to the goaf gangue conveyor 40.

[0048] The discharge end of the goaf gangue conveyor 40 is located above the feed end of the backfill conveyor 50, and the discharge end of the backfill conveyor 50 is located above the goaf. The goaf gangue conveyor 40 conveys the gangue into the backfill conveyor 50, which conveys the gangue to the goaf for goaf filling. At the same time, the gangue falls into the filling mold in the goaf through the backfill conveyor 50 as filling material, preventing the rapid roof fall in the back of the frame from inducing the roof fall in the front of the frame, slowing down the impact caused by the roof fall speed in the back of the frame and the overall subsidence of the roof in the front of the frame.

[0049] In this embodiment, the coal and gangue sorting process uses the principle of density difference of coal and gangue at the source of coal flow, uses heavy medium screening technology, crushing technology and fracturing technology to separate coal and gangue, separates coal and gangue, transports clean coal to the ground, fills the goaf space with separated gangue to form different filling bodies such as gangue mound 81, gangue dam 83 and gangue wall 82, realizes gangue without lifting to the surface, effectively alleviates the problem of roof impact and excessive overall subsidence of the roof, and realizes green, economic and environmental protection.

[0050] The present application realizes the separation of gangue from the source of coal flow, directly conveys the separated gangue to the goaf for in-situ filling, realizes the separation of gangue from the source of coal flow, treats the coal and gangue solid waste on site, shortens the transportation distance of gangue, is convenient to operate, effectively solves the problem of large amount of gangue accumulation, directly uses gangue to fill the goaf, reduces the amount of gangue lifted to the surface, reduces the pollution, occupation and surface subsidence of the ground environment, reduces the production and transportation cost of the mine, realizes green mining without lifting gangue to the surface.

[0051] Specifically, the gangue processing process of the filling system of the embodiment is as follows:

[0052] Step one, the raw coal crushed in the raw coal crusher 60 falls into the dense medium separator 10 for screening treatment; wherein, the clean coal moves upward to the surface close to the liquid screening medium 11 in the dense medium separator 10 to fall onto the conveying belt of the clean coal conveying machine 20, and the gangue moves downward to the bottom close to the liquid screening medium 11 to fall onto the conveying belt of the gangue conveying machine 30, to complete the separation and screening of the coal and gangue;

[0053] Step two, the clean coal conveying machine 20 conveys the clean coal to the feeding end of the rubberized in-pit conveying machine 90, which conveys the clean coal to the ground.

[0054] Step three, the goaf gangue conveying machine 40 conveys the gangue to the feeding end of the backfilling conveying equipment 50 behind the support, which conveys the gangue to the filling mold in the goaf for filling.

[0055] Wherein, a plurality of filling molds are arranged in the goaf, and the plurality of filling molds include a stone pier body filling mold, a wall body filling mold, a dam body filling mold or a column body filling mold. The gangue is filled in these filling molds to form a gangue pier 81, a gangue wall 82, a gangue dam 83 or a gangue column 84, as shown in Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in Figure 9 and Figure 10 During the raw coal mining process, the mining equipment, the raw coal crusher 60 and the filling system constitute a train of equipment, as the train of equipment advances, the working face is continuously advanced, raw coal mining is carried out on the working face, and the filling mold is placed in the goaf after mining is completed, and the filling system sequentially completes filling.

[0056] In one embodiment, as shown in Figure 1 and Figure 2 A full-automatic coal flow rapid separation gangue in-situ filling system further comprises a dense medium liquid storage tank 12, a dense medium liquid monitor 13, a camera 14 and a dense medium liquid pumping pump 15.

[0057] The dense medium liquid monitor 13 is fixedly arranged inside the dense medium separator 10, and the dense medium liquid monitor 13 is used to monitor the height, concentration, temperature and other parameters of the liquid screening medium 11. The camera 14 is fixedly arranged above the dense medium separator 10, and the camera 14 shoots the video of the working process of the dense medium separator 10 to monitor the working process of the dense medium separator 10.

[0058] One end of the heavy medium pumping device 15 is located in the heavy medium storage tank 12, and the other end of the heavy medium pumping device 15 is located in the heavy medium separator 10. The heavy medium storage tank 12 is arranged on one side outside the heavy medium separator 10. The heavy medium storage tank 12 is used to store the liquid screening medium. The heavy medium pumping device 15 can inject the liquid screening medium in the heavy medium storage tank 12 into the heavy medium separator 10, or pump the liquid screening medium 11 in the heavy medium separator 10 out of the heavy medium storage tank 12.

[0059] In this embodiment, when the height, concentration, temperature and other parameters of the liquid screening medium 11 in the heavy medium separator 10 change, for example, when the liquid level is too low (too high), the heavy medium pumping device 15 performs the injection (pumping) operation. The filling system of this embodiment has high automation degree, is convenient for monitoring the work of the heavy medium separator 10, and improves the production efficiency.

[0060] Specifically, the heavy medium monitor 13, the camera 14 and the heavy medium pumping device 15 can be controlled by an external automatic control system. The heavy medium monitor 13 monitors various parameters of the liquid screening medium 11 in the heavy medium separator 10 and sends the monitoring data to the external automatic control system. The automatic control system determines whether the monitoring data changes according to the received monitoring data, sends the injection or pumping operation instruction to the heavy medium pumping device 15 according to the change of the monitoring data, and controls the heavy medium pumping device 15 to work.

[0061] Further, as shown in Figure 3 and Figure 4 The post-rack filling conveying device 50 includes a post-rack filling conveyor 51 and a rotating transfer device 52. The rotating part of the rotating transfer device 52 is fixedly connected with the conveying belt at the feeding end of the post-rack filling conveyor 51. The rotating transfer device 52 can drive the conveying belt of the post-rack filling conveyor 51 to rotate a certain angle in the horizontal plane with the rotating transfer device 52 as the rotation center. The discharging end of the post-rack filling conveyor 51 moves accordingly, and the discharging end can be located above the filling mold at different positions to convey the gangue to the filling mold at different positions for filling. Of course, the rotating post-rack filling conveyor 51 can also fill different positions in the same filling mold for uniform filling.

[0062] Further, the rotating transfer device 52 includes a driving motor and a rotating part.

[0063] The output shaft of the driving motor is perpendicular to the conveying surface of the rear filling conveyor 51 and is fixedly connected with the rotating part. Specifically, the rear filling conveyor 51 fills the gangue to the filling mold corresponding to the discharge end position of the conveying belt, and after the filling is completed, the driving motor drives the rotating part to rotate, the rotating part drives the rear filling conveyor 51 to rotate by a certain angle θ, and the discharge end of the rear filling conveyor 51 moves to another position to fill the gangue to another filling mold, and the filling is gradually completed along with the movement of the working face, and the degree of automation is high.

[0064] The embodiment of the present application also provides a full-automatic coal flow quick gangue separation in-situ filling method, which is applied to the full-automatic coal flow quick gangue separation in-situ filling system and comprises the following steps:

[0065] In step one, the raw coal crushed in the raw coal crusher 60 falls into the dense medium separator 10 for screening treatment, wherein the clean coal moves upward to the surface close to the liquid screening medium 11 in the dense medium separator 10 to fall onto the conveying belt of the clean coal separator conveyor 20, and the gangue moves downward to the bottom close to the liquid screening medium 11 to fall onto the conveying belt of the gangue separator conveyor 30, so that the coal and gangue separation and screening are completed.

[0066] In step two, the clean coal separator conveyor 20 conveys the clean coal to the feeding end of the rubberized conveying gallery conveyor 90, and the rubberized conveying gallery conveyor 90 conveys the clean coal to the ground.

[0067] In step three, the gangue separator conveyor 40 conveys the gangue to the feeding end of the rear filling conveying equipment 50, and the rear filling conveying equipment 50 conveys the gangue to the filling mold in the goaf for filling.

[0068] It should be noted that in the working processes of steps one, two and three, the heavy medium liquid monitor 13 monitors the parameters of the liquid screening medium 11 in the dense medium separator 10 and sends the monitoring data to the external automatic control system, and the automatic control system controls the heavy medium liquid pumping pump 15 to work according to the received monitoring data.

[0069] As shown in Figure 9 and Figure 10 In the working processes of steps one, two and three, the mining equipment, the raw coal crusher 60 and the filling system continuously advance, the working face continuously advances, the raw coal is mined on the working face, the mined raw coal is conveyed to the raw coal crusher 60 through the scraper conveyor 70 for crushing, and the crushed raw coal sequentially fills the filling molds in the mined goaf through the filling system.

[0070] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0071] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0072] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0074] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the specification.

[0075] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For those skilled in the art, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the protection scope of the present application.

Claims

1. A fully automated coal flow rapid separation and gangue in-situ backfilling system, characterized in that, include: Heavy medium separator (10), coal sorting conveyor (20), gangue sorting conveyor (30), goaf gangue conveyor (40) and backfilling conveyor (50); The feed inlet of the heavy medium separator (10) is located below the external raw coal crusher (60). A scraper conveyor (70) is provided above the raw coal crusher (60) to transport raw coal into the raw coal crusher (60). The conveyor belt of the coal sorting conveyor (20) is located near the top of the heavy medium separator (10); One end of the conveyor belt of the sorting coal conveyor (20) is located on one side of the raw coal crusher (60), and the other end extends along the long axis of the top of the heavy medium separator (10) to above the feed end of the grouted conveyor (90) outside the heavy medium separator (10). The conveyor belt of the sorting gangue conveyor (30) is located near the bottom of the heavy medium separator (10) and extends along the long axis of the bottom of the heavy medium separator (10). One end of the conveyor belt of the sorting gangue conveyor (30) passes through the heavy medium separator (10) and is located above the feed end of the goaf gangue conveyor (40), while the other end extends to the end of the interior of the heavy medium separator (10). The discharge end of the goaf gangue conveyor (40) is located above the feed end of the back-mounted filling conveyor (50), and the discharge end of the back-mounted filling conveyor (50) is located above the goaf. It also includes: a heavy medium storage tank (12), a heavy medium monitor (13), a camera (14), and a heavy medium pump (15); The heavy medium liquid monitor (13) is fixedly installed inside the heavy medium separator (10); The camera (14) is fixedly mounted above the heavy medium separator (10); The heavy medium pump (15) has one end located inside the heavy medium storage tank (12) and the other end located inside the heavy medium separator (10); The heavy medium storage tank (12) is located on one side outside the heavy medium separator (10); The rear filling and conveying equipment (50) includes: a rear filling conveyor (51) and a rotary transfer device (52); The rotating part of the rotary transfer device (52) is fixedly connected to the conveyor belt at the feed end of the frame-back filling conveyor (51); The rotating transfer device (52) includes: a drive motor and a rotating part; The output shaft of the drive motor is perpendicular to the conveying surface of the rear filling conveyor (51) and is fixedly connected to the rotating part.

2. The fully automated coal flow rapid separation and gangue in-situ backfilling system according to claim 1, characterized in that, Multiple filling molds are installed within the goaf area; The filling mold includes: stone pier filling mold, wall filling mold, dam filling mold or column filling mold.

3. A fully automated method for rapid separation of coal flow and in-situ backfilling of gangue, characterized in that, The fully automated coal flow rapid separation and gangue in-situ backfilling system described in claim 1 or 2 includes the following steps: Step 1: The raw coal crushed in the raw coal crusher (60) falls into the heavy medium separator (10) for screening. The clean coal moves upward to the surface of the liquid screening medium (11) in the heavy medium separator (10) and falls onto the conveyor belt of the clean coal conveyor (20). The gangue moves downward to the bottom of the liquid screening medium (11) and falls onto the conveyor belt of the gangue conveyor (30), thus completing the coal and gangue separation and screening. Step 2: The sorting coal conveyor (20) transports the clean coal to the feed end of the conveyor belt (90), and the conveyor belt (90) transports it to the ground. Step 3: The gangue conveyor (40) in the goaf area transports the gangue to the feed end of the backfilling conveyor (50), and the backfilling conveyor (50) transports the gangue to the filling mold in the goaf area for filling.

4. The fully automated method for rapid separation of coal flow and in-situ backfilling of gangue according to claim 3, characterized in that, Also includes: The heavy medium liquid monitor (13) monitors the parameters of the liquid screening medium (11) in the heavy medium separator (10) and sends the monitoring data to the external automatic control system. The automatic control system controls the heavy medium liquid pump (15) to work according to the received monitoring data.

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