Multi-path dense medium feeding device

Abstract

The utility model provides a multi-path dense medium feeding device. The multi-path dense medium feeding device comprises a qualified medium barrel, a first feeding pipeline, a second feeding pipeline and at least one qualified medium feeding pump. A liquid level meter is arranged in the qualified medium barrel, and the top of the qualified medium barrel is connected with a water supplementing pipeline and a material supplementing pipeline through a water supplementing valve and a material supplementing valve respectively; an inlet of the qualified medium feeding pump is connected with the qualified medium barrel, and an outlet of the qualified medium feeding pump is connected with dense medium feeding ports of the first dense medium separation equipment and the second dense medium separation equipment through a first feeding pipeline and a second feeding pipeline respectively; a first flow regulating valve is arranged on the first feeding pipeline, and a second flow regulating valve and a first clear water regulating valve are arranged on the second feeding pipeline. According to the multi-path dense medium feeding device, two-stage dense medium feeding with the adjustable density range can be provided for a cascade type coarse slime dense medium separation system.

Description

Technical Field

[0001] The present application belongs to the technical field of heavy medium coal preparation, and specifically provides a multi-channel heavy medium feeding device. Background Art

[0002] The coarse coal slime sorting system can efficiently sort the coarse coal slime with a particle size of 1.0mm to 0.2mm obtained during coal mining, which can effectively increase coal production and avoid waste of coal resources. It has attracted more and more attention in the industry.

[0003] Existing coal slime sorting equipment mainly includes coal slime heavy medium cyclone, spiral separator, heavy medium interference bed separator and coarse coal slime heavy medium sorting system composed of the above equipment. For example, patent CN105597914A discloses a heavy medium interference bed coarse coal slime sorting system, which is composed of a cascaded coal slime water grading cyclone and a heavy medium interference bed separator to form a two-stage sorting structure. After the bottom flow of the coal slime water grading cyclone enters the heavy medium interference bed separator, the clean coal and medium coal (or gangue) are recovered through the overflow and bottom flow of the heavy medium interference bed respectively.

[0004] In the above-mentioned two-stage sorting architecture, the coal sludge water grading cyclone and the heavy medium interference bed separator need to be equipped with independent coal sludge water buckets and qualified medium buckets. In particular, the mixing of coal sludge water requires separately set mixing buckets and mixing pumps, which makes the structure of the feeding part and the processing process complicated and the operating energy consumption increased. At the same time, over-crushing problems are prone to occur during the mixing and transportation of coal sludge. To solve the above problems, a two-stage heavy medium sorting system can be formed by cascading two-stage heavy medium sorting equipment to replace the original coal sludge water grading cyclone cascade heavy medium interference bed separator architecture. Obviously, the feeding structure of the heavy medium suspension needs to be optimized so that the heavy medium feed meets the feeding standard of the two-stage heavy medium sorting equipment. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the present application provides a multi-channel heavy medium feeding device through an embodiment, which provides a heavy medium suspension for a first heavy medium sorting device and a second heavy medium sorting device cascaded in a coarse coal slime heavy medium sorting system. The multi-channel heavy medium feeding device includes a qualified medium barrel, a first feeding pipeline, a second feeding pipeline, and at least one qualified medium feeding pump; a liquid level gauge is arranged inside the qualified medium barrel, and the top is connected to the water replenishment pipeline and the feeding pipeline through a water replenishment valve and a feeding valve respectively; the inlet of the qualified medium feeding pump is connected to the qualified medium barrel, and the outlet is connected to the heavy medium feeding ports of the first heavy medium sorting device and the second heavy medium sorting device through the first feeding pipeline and the second feeding pipeline respectively; a first flow regulating valve is arranged on the first feeding pipeline, and a second flow regulating valve and a first clean water regulating valve are arranged on the second feeding pipeline.

[0006] Preferably, the first heavy medium separation equipment is a heavy medium cyclone; the second heavy medium separation equipment is a heavy medium interference bed separator; the density ratio between the heavy medium suspension entering the heavy medium cyclone through the first feed pipeline and the heavy medium suspension entering the heavy medium interference bed separator through the second feed pipeline is 1.1 to 1.5.

[0007] Preferably, the first feed pipeline is also provided with a first density meter, a first magnetic content meter and a first pressure transmitter; the second feed pipeline is also provided with a second density meter, a second magnetic content meter and a second pressure transmitter, and the first clean water regulating valve is arranged at the front end of the second density meter.

[0008] Preferably, there are two qualified medium feed pumps, namely a first qualified medium feed pump and a second qualified medium feed pump; the outlet of the first qualified medium feed pump is connected to the first feed pipeline, and the outlet of the second qualified medium feed pump is connected to the second feed pipeline.

[0009] Furthermore, the connection position of the first qualified medium feed pump and the qualified medium barrel is not higher than the connection position of the second qualified medium feed pump and the qualified medium barrel.

[0010] Preferably, a coal slime feeding funnel is arranged above the heavy medium cyclone; the multi-channel heavy medium feeding device also includes a third feeding pipeline, one end of which is connected to the qualified medium feeding pump, and the other end enters the coal slime feeding funnel along a tangent through a pre-cyclone wetting pipe.

[0011] Preferably, the third feed pipeline is provided with a third flow regulating valve, a third density meter, a third magnetic content meter, a third pressure transmitter and a second clean water regulating valve; the second clean water regulating valve is arranged at the front end of the third density meter.

[0012] Preferably, the density of the heavy medium suspension entering the coal slime feeding hopper through the third feeding pipeline is not greater than the density of the heavy medium suspension entering the heavy medium cyclone through the first feeding pipeline.

[0013] Preferably, the upper portion of the qualified medium barrel is a cylindrical structure, the lower portion is a conical structure, and a high-pressure blowing device is provided at the bottom of the qualified medium barrel.

[0014] The multi-channel heavy medium feeding device provided in this embodiment optimizes the feeding structure of the existing coarse coal slime heavy medium sorting system, uses only one qualified medium barrel, and provides heavy medium suspensions with different densities to the two-stage heavy medium sorting devices through the first feeding pipeline and the second feeding pipeline at the same time. There is no need to additionally set up a mixing barrel for evenly mixing the qualified medium suspension with the selected coal slime, which effectively reduces the number of equipment and operating energy consumption, and avoids the problem of over-crushing during the mixing and transmission of coal slime. At the same time, the heavy medium suspensions in the two feeding pipelines are adjusted to a suitable density ratio range through the first clean water regulating valve to meet the feeding standard of the two-stage heavy medium sorting equipment for the heavy medium suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the framework of a multi-channel heavy medium feeding device provided according to an embodiment of the present application;

[0016] Figure 2 A schematic diagram of the connection of a multi-channel heavy medium feeding device provided in an embodiment of the present application for providing heavy medium feeding for a coarse coal slime heavy medium separation system;

[0017] Figure 3 It is a schematic diagram of the framework of a multi-channel heavy medium feeding device provided according to an embodiment of the present application;

[0018] Figure 4 A schematic diagram of the framework of the multi-channel heavy medium feeding device provided according to an embodiment of the present application and its connection for providing heavy medium feeding for a coarse coal slime heavy medium separation system;

[0019] Figure 5 for Figure 4 Schematic diagram of the structure of a medium-heavy medium cyclone.

[0020] Numbers in the figure

[0021] A multi-channel heavy medium feeding device 1, a qualified medium barrel 11, a water replenishment valve 111, a water replenishment pipeline 112, a replenishment valve 113, a replenishment pipeline 114, a first qualified medium feeding pump 121, a second qualified medium feeding pump 122, a first feeding pipeline 131, a first flow regulating valve 1311, a first magnetic content meter 1312, a first density meter 1313, a first pressure transmitter 1314, a second feeding pipeline 132, a second flow regulating valve 1321, a first magnetic content meter 1322, a second density meter 1323, a second pressure transmitter 1324, a first clean water regulating valve 1325, a third feeding pipeline 133, a third flow regulating valve 1326, a third magnetic content meter 1327, a second density meter 1328, a second pressure transmitter 1329, a first clean water regulating valve 1330, a third feeding pipeline 1331, a third flow regulating valve 1332, a third magnetic content meter 1333, a second density meter 1334, a second pressure transmitter 1335, a third clean water regulating valve 1336, a third clean water regulating valve 1337, a third clean water regulating valve 1338, a third clean water regulating valve 1339, a third clean water regulating valve 1340, a third clean water regulating valve 1341, a third clean water regulating valve 1342, a third clean water regulating valve 1343, a third clean water regulating valve 1344, a third clean water regulating valve 1345, a third clean water regulating valve 1346, a third clean water regulating valve 1347, a third clean water regulating valve 1348, a third clean water regulating valve 1349, a third clean water regulating valve 1349, a third clean water regulating valve 1341, a third clean water regulating valve 1342 31, third magnetic content meter 1332, third density meter 1333, third pressure transmitter 1334, pre-cyclone wetting tube 1335, heavy medium cyclone 2, cylinder 21, medium feed port 22, overflow port 23, underflow port 24, coal slime feed funnel 25, feed pipe 26, bracket 27, heavy medium interference bed separator 3, clean coal extraction device 4, clean coal de-medium laminated high frequency fine screen 41, clean coal magnetic separator 42, clean coal laminated high frequency fine screen 43, clean coal slime centrifugal dehydrator 44, diverter valve 45, tail coal extraction device 5, tail coal de-medium laminated high frequency fine screen 51, tail coal magnetic separator 52, tail coal laminated high frequency fine screen 53, tail coal slime centrifugal dehydrator 54. DETAILED DESCRIPTION

[0022] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0023] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, it 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 specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, the words first, second, etc. are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance, and their names may be different in the detailed description and claims of the present application.

[0024] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0025] The present application provides a multi-channel heavy medium feeding device through an embodiment, which is arranged in a coarse coal slime heavy medium separation system adopting a two-stage heavy medium separation architecture, and is used to provide a heavy medium suspension that meets the standards for a cascaded first heavy medium separation device and a second heavy medium separation device. Figure 1 It is a schematic framework diagram of a multi-channel heavy medium feeding device 1 provided according to some preferred embodiments of the present application.

[0026] like Figure 1 As shown, the multi-channel heavy medium feeding device 1 includes a qualified medium barrel 11, a first qualified medium feeding pump 121, a first feeding pipeline 131 and a second feeding pipeline 132, wherein the inlet of the first qualified medium feeding pump 121 is connected to the qualified medium barrel 11, and the outlet is connected to the heavy medium feeding ports of the first heavy medium sorting device and the second heavy medium sorting device through the first feeding pipeline 131 and the second feeding pipeline 132 respectively, and the heavy medium suspension in the qualified medium barrel is pumped into the first heavy medium sorting device and the second heavy medium sorting device respectively.

[0027] Preferably, the upper part of the qualified medium barrel 11 is a cylindrical structure, and the lower part is a conical structure, and a liquid level meter (not shown) is arranged inside the qualified medium barrel 11. The top of the qualified medium barrel 11 is connected to the water supply pipeline 112 through the water supply valve 111, and is connected to the feed supply pipeline 114 through the feed valve 113. The liquid level meter is locked and controlled with the water supply valve 111 and the feed valve 113. When the liquid level in the qualified medium barrel 11 is lower than the preset lower limit (such as 50%), the water supply valve 111 and the feed valve 113 are used to replenish new clean water and medium powder (such as magnetite powder) according to a preset ratio. When the liquid level in the qualified medium barrel 11 reaches the preset upper limit (such as 80%), it is automatically closed, thereby achieving a normal liquid level and ensuring stable production. In addition, in some preferred embodiments, a high-pressure blast device is arranged at the bottom of the qualified medium barrel 11 to prevent the magnetite powder from settling and causing material accumulation problems.

[0028] Furthermore, if Figure 1As shown, a first flow regulating valve 1311 is provided on the first feed pipeline 131, and a second flow regulating valve 1321 is provided on the second feed pipeline 132, which are used to control the flow of the heavy medium suspension pumped into the first heavy medium separation device and the second heavy medium separation device respectively.

[0029] In some preferred embodiments, Figure 1 As shown, a first magnetic content meter 1312 and a first density meter 1313 are also provided on the first feed pipeline 131, and a second magnetic content meter 1322 and a second density meter 1323 are also provided on the second feed pipeline 132. Densitometers and magnetic content meters are provided on the first feed pipeline 131 and the second feed pipeline 132, respectively, so that the density and magnetic content of the qualified medium suspension can be detected online, and then the density and magnetic content of the qualified medium suspension on each feed pipeline can be adjusted by adding water or medium.

[0030] In some preferred embodiments, further, a first pressure transmitter 1314 is provided on the first feed pipeline 131 near the medium feed port of the first heavy medium separation device to perform real-time detection and adjustment of the pressure of the heavy medium suspension entering the first heavy medium separation device (in the embodiment of the present application, the heavy medium suspension entering the first heavy medium separation device through the first feed pipeline 131 is represented by the first heavy medium suspension); a second pressure transmitter 1324 is provided on the second feed pipeline 132 near the medium feed port of the second heavy medium separation device to perform real-time detection and adjustment of the pressure of the heavy medium suspension entering the second heavy medium separation device (in the embodiment of the present application, the heavy medium suspension entering the second heavy medium separation device through the second feed pipeline 132 is represented by the second heavy medium suspension).

[0031] When a two-stage heavy medium separation device cascade architecture is adopted, a gradient separation product can be formed by setting the density of the heavy medium in the two heavy medium separation devices, for example, Figure 2A coarse coal slime heavy medium separation system is shown which provides two-stage heavy medium feeding through the multi-channel heavy medium feeding device 1. In the system, the first-stage heavy medium separation equipment is a heavy medium cyclone 2, and the second-stage heavy medium separation equipment is a heavy medium interference bed separator 3, wherein the medium feed port of the heavy medium cyclone 2 receives the heavy medium suspension from the qualified medium barrel 11 through the first feed pipeline 131 and rotates at high speed in its cylinder, and a coal slime feeding funnel is arranged on the upper part of the coal slime heavy medium cyclone 2. The selected coarse coal slime in its original state enters the coal slime heavy medium cyclone 2 through the coal slime feeding funnel in a pressureless manner by relying on its own gravity, and is efficiently separated under the action of centrifugal force, wherein the slurry containing clean coal components is discharged through its overflow port into the clean coal extraction device 4, and the high-density tail coal slurry containing medium coal and gangue components is discharged through the bottom flow port into the heavy medium interference bed separator 3.

[0032] The medium feed port of the heavy medium interference bed separator 3 receives the heavy medium suspension from the qualified medium barrel 11 through the second feed pipeline 132. Under the action of the interference bed, the slurry entering from the bottom flow port of the coal slime heavy medium cyclone 2 is further sorted according to the density difference. The slurry with lower density enters the clean coal extraction sub-device 4 through the overflow port, and the slurry with higher density enters the tail coal extraction device 5 through the bottom flow port.

[0033] In some specific embodiments, the clean coal extraction device 4 includes a cascade of clean coal de-medium laminated high-frequency fine screens 41, a clean coal magnetic separator 42, a clean coal laminated high-frequency fine screen 43 and a clean coal slime centrifugal dewatering machine 44, wherein the overflow ports of the heavy medium cyclone 2 and the heavy medium interference bed separator 3 are connected to the clean coal de-medium laminated high-frequency fine screen 41, and the overflow products thereof are combined and enter the clean coal de-medium laminated high-frequency fine screen 41 for de-medium treatment, the screened material of the clean coal de-medium laminated high-frequency fine screen 41 is returned to the qualified medium barrel 11, and the screened material is diluted with clean water to a concentration of 15-25%, and then enters the clean coal magnetic separator 42 for medium recovery operation, and the clean coal magnetic separator 42 recovers The concentrate product returns to the qualified medium barrel 11, and the tailings product enters the clean coal laminated high-frequency fine screen 43 for dehydration and desliming; the screened material of the clean coal laminated high-frequency fine screen 43 enters the clean coal slime centrifugal dehydrator 44 for final moisture control, and its dehydration product is a qualified clean coal product, and its centrifuge liquid enters the flotation machine; in addition, preferably, the clean coal extraction device 4 also includes a diverter valve 45 arranged on the pipeline for the screened material of the clean coal de-medium laminated high-frequency fine screen 41 to return to the qualified medium barrel 11, which is used to divert the screened material of the de-medium laminated high-frequency fine screen 41 to the clean coal magnetic separator 42 for medium recovery, so as to reduce the coal slime content in the heavy medium suspension in the qualified medium barrel 11.

[0034] The tailing coal extraction device 5 comprises a cascaded tailing coal de-intermediation laminated high-frequency fine screen 51 , a tailing coal magnetic separator 52 , a tailing coal laminated high-frequency fine screen 53 and a tailing coal slime centrifugal dewatering machine 54 .

[0035] Among them, the bottom flow port of the heavy medium interference bed separator 3 is connected to the tailing coal de-mediumizing laminated high-frequency fine screen 51, and its bottom flow product enters the tailing coal de-mediumizing laminated high-frequency fine screen 51 for de-mediuming treatment, and the underscreen of the tailing coal de-mediumizing laminated high-frequency fine screen 51 is returned to the qualified medium barrel 11, and the overscreen is diluted with clean water to a concentration of 15-25% and then enters the tailing coal magnetic separator 52; the concentrate product of the tailing coal magnetic separator 52 returns to the qualified medium barrel 11, and the tailings product enters the tailing coal laminated high-frequency fine screen 53; the overscreen of the tailing coal laminated high-frequency fine screen 53 enters the tailing coal slime centrifugal dehydrator 54, and the underscreen enters the concentrator; the dehydration product of the tailing coal slime centrifugal dehydrator 54 is tailings, and the centrifugal liquid enters the concentrator.

[0036] Generally, compared with the coal slime heavy medium cyclone 2, the heavy medium interference bed separator 3 requires relatively lower rising medium density and concentration, that is, the density of the first heavy medium suspension is greater than the density of the second heavy medium suspension. Preferably, the ratio of the two densities is 1.1 to 1.5.

[0037] To adjust the density ratio of the first heavy medium suspension to the second heavy medium suspension, as Figure 1 As shown, a first clean water regulating valve 1325 is also provided on the second feed pipeline 132, and the first clean water regulating valve 1325 is provided at the front end of the second densitometer 1323. On the basis of the density of the first heavy medium suspension outputted from the first qualified medium feed pump 12 obtained by the first densitometer 1313, the amount of added clean water is adjusted by the first clean water regulating valve 1325 and the density of the second heavy medium suspension obtained after dilution is detected by the second densitometer 1323, thereby achieving the adjustment of the density and concentration ratio of the second heavy medium suspension to the first heavy medium suspension to an appropriate range.

[0038] Through the above-mentioned arrangement, the multi-channel heavy medium feeding device 1 can perform efficient heavy medium feeding operation on the coarse coal slime heavy medium sorting system adopting the two-stage heavy medium sorting architecture. On the basis of using only one qualified medium barrel 11, the first feeding pipeline 131 and the second feeding pipeline 132 simultaneously provide heavy medium suspensions with different densities for the two-stage heavy medium sorting device. There is no need to additionally set up a mixing barrel for evenly mixing the qualified medium suspension with the selected coal slime, which effectively reduces the number of equipment and operating energy consumption, and avoids the problem of over-crushing during the mixing and transmission of coal slime. At the same time, through the first clean water regulating valve 1325, the heavy medium suspensions in the two feeding pipelines are adjusted to a suitable density ratio range to meet the feeding standard of the two-stage heavy medium sorting equipment for the heavy medium suspension.

[0039] Figure 3 The frame structure diagram of the multi-channel heavy medium feeding device 1 provided according to some preferred embodiments of the present application is shown. Figure 1Except for the same parts, the number of qualified medium feed pumps in the heavy medium feeding device 1 is two, namely the first qualified medium feed pump 121 and the second qualified medium feed pump 122, wherein the first feed pipeline 131 is still connected to the first qualified medium feed pump 121, and the second feed pipeline 132 is connected to the second qualified medium feed pump 122, and the qualified medium suspension is pumped into the second heavy medium sorting equipment through the second qualified medium feed pump 122.

[0040] Preferably, if Figure 3 As shown, the first qualified medium feed pump 121 and the second qualified medium feed pump 122 are arranged at different heights of the qualified medium barrel 11, wherein the connection position of the second qualified medium feed pump 122 and the qualified medium barrel 11 is higher than the connection position of the first qualified medium feed pump 121 and the qualified medium barrel 11, and the two have a height difference of H.

[0041] The reason for separately setting the second qualified medium feed pump 122 for the second feed pipeline 132 and making the two feed pumps form a certain height difference is that the second qualified medium enters the second heavy medium separation device (such as Figure 2 The density of the second heavy medium suspension entering the heavy medium interference bed separator 3) generally needs to be less than that entering the first heavy medium separator (such as Figure 2 The density of the first heavy medium suspension in the heavy medium cyclone 2) is due to the large density of the magnetic medium in the heavy medium suspension, which has an obvious tendency to fall due to gravity. Therefore, the medium suspension in the qualified medium barrel 11 often shows a density stratification phenomenon, so that the density of the suspension located in the lower part of the qualified medium barrel 11 is naturally greater than the density of the suspension in the upper part. By utilizing this phenomenon, by raising the position of the second qualified medium feed pump 122, the suspension pumped out by it can be closer to the density required by the heavy medium interference bed separator 3 than the suspension pumped out by the first qualified medium feed pump 121, and the operating requirements can be met without excessive dilution operations.

[0042] because Figure 2 In the coarse coal slime heavy medium separation system shown in the figure, the coal slime directly enters the cylinder of the heavy medium cyclone through the coal slime feeding funnel by its own gravity. In order to make it meet the working index of the cyclone as much as possible when entering the cylinder, it can be pre-swirled and pre-wetted in advance. For this purpose, Figure 4 As shown, in some preferred embodiments, a third feed pipeline 133 may be further added, and the third feed pipeline 133 is used to pre-cyclone and pre-wet the selected coal slime at the coal slime feed funnel of the heavy medium cyclone 2, so as to ensure more efficient sorting of the coal slime after entering the cylinder.

[0043] Among them, a third flow regulating valve 1331 is provided on the third feed pipeline 133, which is used to adjust the flow of the heavy medium suspension for pre-spinning and pre-wetting treatment of the coal slime. In addition, in some preferred embodiments, a third magnetic content meter 1332, a third density meter 1333 and a third pressure transmitter 1334 are also provided on the third feed pipeline 133. The setting method and working method of the above devices are the same as or similar to the corresponding devices on the first feed pipeline 131 and the second feed pipeline 132, and are not repeated here.

[0044] Similar to the previous analysis, the density of the heavy medium suspension (referred to as the third heavy medium suspension in this embodiment) that enters the coal slime feeding funnel for pre-swirling and pre-wetting treatment of the coal slime needs to be adjusted according to the properties of the selected coal slime. Preferably, the density of the third heavy medium suspension is less than or equal to the density of the first heavy medium suspension.

[0045] Figure 4 The first feed pipeline 131, the second feed pipeline 132 and the third feed pipeline 133 are all connected to the first qualified medium feed pump 121. In some preferred embodiments, in order to adjust the density of the third heavy medium suspension, a second clean water regulating valve (not shown in the figure) can also be set at the front end of the third density meter 1333 on the third feed pipeline 133; in addition, it can also be as follows Figure 3 As shown, a second qualified medium feed pump 122 is added, and the second qualified medium feed pump 122 is used to provide feed for the second feed pipeline 132 and the third feed pipeline 133, and then the density is adjusted in combination with the second clean water regulating valve; in other preferred embodiments, a third qualified medium feed pump (not shown in the figure) can be further added, and its height relative to the qualified medium barrel 11 can be set according to the density required to be achieved by the third heavy medium suspension, so as to adjust the density of the third heavy medium suspension in a more efficient and water-saving manner.

[0046] Figure 5 Shows Figure 4 The specific structural diagram of the medium and heavy medium cyclone 2 is as follows: Figure 5 As shown, the heavy medium cyclone 2 includes a cylinder 21 , a medium feed port 22 , an overflow port 23 , an underflow port 24 , and a coal sludge feed hopper 25 .

[0047] Among them, the coal slime feeding funnel 25 is connected to the cylinder 21 through the feeding pipe 26, so that the selected coal slime enters the cylinder 21 under the action of gravity. The end of the third feeding pipeline 133 is connected with a pre-rotation wetting pipe 1335, which penetrates and enters the coal slime feeding funnel 25 at a tangent angle, forming a high-speed rotating centrifugal force field in the coal slime feeding funnel 25. After the selected coal slime enters, it can be quickly mixed with the high-speed rotating third heavy medium suspension to obtain the rotation speed required for effective sorting, thereby achieving the purpose of efficient sorting.

[0048] Furthermore, if Figure 5 As shown, the cross section of the medium feed port 22 is rectangular, and the medium feed port 22 enters the cylinder 21 at one side of the lower part of the coal slime heavy medium cyclone 2 by a tangent or involute feeding method. The overflow pipe connected to the overflow port 23 is vertically inserted into the central cavity at the lower part of the cylinder 21. The bottom flow port 24 is arranged on one side of the upper part of the cyclone, and its size can be adjusted according to the properties of the processed coal slime and the production index requirements.

[0049] In some preferred embodiments, the ratio of the length to the diameter of the cylinder 21 is in the range of 3.5 to 4.5, the ratio of the caliber of the medium feed port 22 to the diameter of the cylinder 21 is in the range of 0.20 to 0.25, the ratio of the caliber of the overflow port 23 to the diameter of the cylinder 21 is in the range of 0.30-0.40, and the ratio of the caliber of the underflow port 24 to the diameter of the cylinder 21 is in the range of 0.25 to 0.30. The size of the length-to-diameter ratio determines the sorting time of the input coal slime in the cyclone. The sizes of the feed port, overflow port and underflow port have a significant influence on the sorting index and can be customized according to the properties of the input coal slime and production index requirements.

[0050] In addition, if Figure 5 As shown, the cylinder 21 is fixed obliquely by a bracket 27, and the coal slime feeding direction of the coal slime feeding funnel 25 is kept vertical.

[0051] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A multi-channel heavy medium feeding device, which provides heavy medium suspension for the first heavy medium separation device and the second heavy medium separation device cascaded in the coarse coal slime heavy medium separation system, characterized in that: It includes a qualified medium barrel, a first feed pipeline, a second feed pipeline, and at least one qualified medium feed pump; A liquid level gauge is provided inside the qualified medium barrel, and the top is connected to the water supply pipeline and the material supply pipeline through the water supply valve and the material supply valve respectively; The inlet of the qualified medium feed pump is connected to the qualified medium barrel, and the outlet is connected to the heavy medium feed ports of the first heavy medium sorting device and the second heavy medium sorting device through the first feed pipeline and the second feed pipeline respectively; The first feed pipeline is provided with a first flow regulating valve, and the second feed pipeline is provided with a second flow regulating valve and a first clean water regulating valve.

2. The multi-channel heavy medium feeding device according to claim 1, characterized in that: The first heavy medium separation equipment is a heavy medium cyclone; The second heavy medium separation equipment is a heavy medium interference bed separator; The density ratio between the heavy medium suspension entering the heavy medium cyclone through the first feed pipeline and the heavy medium suspension entering the heavy medium interference bed separator through the second feed pipeline is 1.1 to 1.

5.

3. The multi-channel heavy medium feeding device according to claim 1, characterized in that: The first feed pipeline is also provided with a first density meter, a first magnetic content meter and a first pressure transmitter; The second feed pipeline is also provided with a second density meter, a second magnetic content meter and a second pressure transmitter, and the first clean water regulating valve is provided at the front end of the second density meter.

4. The multi-channel heavy medium feeding device according to claim 1, characterized in that: There are two qualified medium feed pumps, namely a first qualified medium feed pump and a second qualified medium feed pump; The outlet of the first qualified medium feed pump is connected to the first feed pipeline, and the outlet of the second qualified medium feed pump is connected to the second feed pipeline.

5. The multi-channel heavy medium feeding device according to claim 4, characterized in that: The connection position of the first qualified medium feed pump and the qualified medium barrel is not higher than the connection position of the second qualified medium feed pump and the qualified medium barrel.

6. The multi-channel heavy medium feeding device according to claim 2, characterized in that: A coal sludge feeding funnel is arranged above the heavy medium cyclone; The multi-channel heavy medium feeding device also includes a third feeding pipeline, one end of which is connected to the qualified medium feeding pump, and the other end of which enters the coal slime feeding funnel along a tangent through a pre-swirl wetting pipe.

7. The multi-channel heavy medium feeding device according to claim 6, characterized in that: The third feed pipeline is provided with a third flow regulating valve, a third density meter, a third magnetic content meter, a third pressure transmitter and a second clean water regulating valve; The second clean water regulating valve is arranged at the front end of the third density meter.

8. The multi-channel heavy medium feeding device according to claim 7, characterized in that: The density of the heavy medium suspension entering the coal slime feeding hopper through the third feeding pipeline is not greater than the density of the heavy medium suspension entering the heavy medium cyclone through the first feeding pipeline.

9. The multi-channel heavy medium feeding device according to claim 1, characterized in that: The upper part of the qualified medium barrel is a cylindrical structure, the lower part is a conical structure, and a high-pressure blowing device is arranged at the bottom of the qualified medium barrel.

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