Coal mine underground thousand-magnitude drainage pretreatment system and process

Abstract

The invention discloses a coal mine underground thousand-magnitude drainage pretreatment system and a coal mine underground thousand-magnitude drainage pretreatment process wherein the coal mine underground drainage pretreatment system comprises: a coarse grain separation system comprising a first-stage sand-water separator and a solid-liquid separator, the feed end of the first-stage sand-water separator receiving coal mine underground slime water, and the feed end of the solid-liquid separator receiving the coal mine underground slime water; the particle discharging end of the first-stage sand-water separator is connected with the feeding end of the solid-liquid separator, and the solid-liquid separator discharges screened slime particles to the belt conveyor from the oversize product discharging end through the screening effect; the dewatering and screening system comprises a pre-screening thickener and a high-frequency dewatering screen, an overflow discharging end of the primary sand-water separator and an undersize material discharging end of the solid-liquid separator are respectively connected with a feeding end of the pre-screening thickener, slime water concentrated by the pre-screening thickener is connected with a feeding end of the high-frequency dewatering screen through a concentration discharging end, and the high-frequency dewatering screen is connected with a discharging end of the high-frequency dewatering screen through a discharging end of the high-frequency dewatering screen. The high-frequency dewatering screen discharges screened slime particles to the belt conveyor from the oversize product discharging end through the screening effect, and the undersize product discharging end of the high-frequency dewatering screen communicates with a sludge pool.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to a system and process for pre-treating underground thousand-level drainage in a coal mine. Background Art

[0002] At present, the main form of drainage system in coal mines at home and abroad is: the coal sludge water from the coal mining face, tunneling face, etc. flows to the central water tank through the transfer pump and ditch. After sedimentation, it is transferred to the ground through the large drainage pump in the water pump room at the bottom of the well. The sediment in the central water tank is excavated by manual excavation or other methods.

[0003] For coal mines with a relatively high content of coal slime in the coal slime water, the water is discharged to the ground through a central water pump, which causes considerable wear on the large pump impeller, increases the number of spare pumps and spare parts, and the workload of maintenance, and may even cause drainage paralysis. The workload of clearing the coal slime after sedimentation in the central water tank is large and the cycle is long, which causes great difficulties and safety hazards to coal mine production. In order to solve this technical problem, the existing technology usually adopts the following technical solutions:

[0004] (1) Design to increase the volume of the central water tank, the number of spare water tanks, and the number of spare water pumps. Although this technical solution ensures the effective volume of the central water tank, prolongs the cleaning cycle, and increases the mine drainage capacity, it still cannot solve the problem of heavy coal slime excavation workload and equipment wear caused by the high coal slime content in the coal slime water, and it also increases the mine construction workload and equipment investment.

[0005] (2) Research and use clearing equipment to speed up the clearing speed. This technical solution improves the efficiency of clearing coal slime, but it is still a passive treatment and cannot solve the problem of heavy workload and equipment wear caused by the high content of coal slime in coal slime water.

[0006] (3) Before entering the silo, the coal sludge water is separated by adding a sedimentation tank. This technical solution settles the coal sludge in a sedimentation tank before the coal sludge water enters the silo, which reduces the coal sludge content in the central water silo and reduces the workload of coal sludge excavation in the central water silo. However, the coal sludge in the sedimentation tank still needs to be excavated, and it cannot solve the problem of large workload of coal sludge excavation caused by the high coal sludge content in the coal sludge water.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes a thousand-level underground coal mine drainage pretreatment system and process, which realizes the pretreatment of coal slime water before entering the warehouse, reduces the coal slime content in the central water warehouse, and fundamentally solves the problems of large coal slime excavation workload and equipment wear caused by the high coal slime content in the coal slime water.

[0009] Specifically, the following technical solution is adopted: a coal mine underground thousand-level drainage pretreatment system, comprising:

[0010] The coarse particle separation system includes a primary sand-water separator and a solid-liquid separator. The feed end of the primary sand-water separator receives the coal slurry water from the coal mine, and the particle discharge end of the primary sand-water separator is connected to the feed end of the solid-liquid separator. The solid-liquid separator discharges the screened ore slurry particles from the screen discharge end to the belt conveyor through the screening action.

[0011] The dewatering and screening system comprises a pre-screen concentrator and a high-frequency dewatering screen. The overflow discharge end of the primary sand-water separator and the screen under discharge end of the solid-liquid separator are respectively connected to the feed end of the pre-screen concentrator. The coal slurry water concentrated by the pre-screen concentrator is connected to the feed end of the high-frequency dewatering screen through the concentrated discharge end. The high-frequency dewatering screen discharges the screened ore sludge particles from the screen over discharge end to the belt conveyor through the screening action. The screen under discharge end of the high-frequency dewatering screen is connected to the sludge pool.

[0012] As an optional embodiment of the present invention, the coarse particle separation system includes a secondary sand-water separator, and the overflow discharge end of the primary sand-water separator is connected to the feed end of the pre-screen concentrator through the secondary sand-water separator;

[0013] The overflow discharge end of the primary sand-water separator is connected to the feed end of the secondary sand-water separator, and the particle discharge end of the secondary sand-water separator is connected to the feed end of the pre-screen concentrator.

[0014] As an optional embodiment of the present invention, the coarse particle separation system includes a cyclone concentrator, and the particle discharge end of the secondary sand-water separator is connected to the feed end of the pre-screen concentrator through the cyclone concentrator;

[0015] The particle discharge end of the secondary sand-water separator is connected to the feed end of the cyclone concentrator, and the coal slime water after the cyclone concentrator concentration treatment is connected to the feed end of the pre-screen concentrator through the concentration discharge end;

[0016] Optionally, the coarse particle separation system includes a slag grid machine, and the coal slime water in the coal mine is sieved by the slag grid machine to remove large particles of debris and then enters the primary sand and water separator.

[0017] As an optional embodiment of the present invention, a coal mine underground thousand-level drainage pretreatment system of the present invention includes a sludge treatment system, which includes a mud water cyclone and a sedimentation regulating tank. The feed end of the mud water cyclone is connected to the sludge tank. The mud water cyclone cyclones the coal sludge water in the sludge tank through rotation, centrifugation and gravity. The small-particle coal sludge water after cyclone treatment is discharged to the sedimentation regulating tank through the overflow discharge end of the mud water cyclone, and the large-particle coal sludge water after cyclone treatment circulates through the cyclone discharge end of the mud water cyclone into the feed end of the high-frequency dewatering screen.

[0018] As an optional embodiment of the present invention, the overflow discharge end of the secondary sand-water separator, the overflow discharge end of the cyclone concentrator, and the overflow discharge end of the pre-screen concentrator are respectively connected to the sedimentation regulating tank.

[0019] As an optional embodiment of the present invention, the sludge treatment system includes a micro-sand settler and a water-sand cyclone, the feed end of the micro-sand settler is connected to the sedimentation regulating tank, the sedimentation discharge end of the micro-sand settler is connected to the feed end of the water-sand cyclone, and the water outlet end of the micro-sand settler is connected to the central water tank;

[0020] The water-sand cyclone extracts micro-sand from the coal slurry water through rotation, centrifugation and gravity, and circulates the micro-sand into the sedimentation regulating tank through the cyclone discharge end of the water-sand cyclone, and discharges the coal slurry into the sludge tank through the overflow discharge end of the water-sand cyclone for further circulated treatment.

[0021] The present invention also provides a coal mine underground thousand-level drainage pretreatment process of a coal mine underground thousand-level drainage pretreatment system, comprising:

[0022] The primary sand-water separator of the coarse particle separation system receives the coal slime water in the coal mine, separates the water in the coal slime water from the large-particle minerals by gravity and filtration, and the coal slime water containing the large-particle minerals enters the solid-liquid separator after separation, and the coal slime water containing the small-particle minerals enters the dehydration screening system. The solid-liquid separator screens the coal slime water containing the large-particle minerals by screening, and the mineral slime particles with a diameter greater than or equal to the first preset diameter R1 on the screen enter the belt conveyor, and the coal slime water under the screen enters the dehydration screening system;

[0023] The pre-screen concentrator of the dewatering and screening system receives the coal slurry water output by the primary sand-water separator and the solid-liquid separator respectively. The pre-screen concentrator concentrates the coal slurry water by rotation, centrifugation and gravity. The coal slurry water with a diameter of ore particles smaller than the second preset diameter R2 overflows and is discharged. The concentrated coal slurry water with a diameter of ore particles greater than or equal to the second preset diameter R2 is input into the high-frequency dewatering screen. The high-frequency dewatering screen dehydrates the ore slurry particles by high-frequency linear vibration. The ore slurry particles with a diameter greater than or equal to the third preset diameter R3 on the screen enter the belt conveyor, and the coal slurry water under the screen flows into the sludge pool.

[0024] Wherein, the first preset diameter R1>the second preset diameter R2>the third preset diameter R3.

[0025] As an optional embodiment of the present invention, the primary sand-water separator of the coarse particle separation system separates the water from the large particle minerals in the coal slime water by gravity and filtration, and the coal slime water containing the small particle minerals enters the dehydration screening system, which includes:

[0026] The first-level sand-water separator inputs the coal slurry water containing small particles of minerals after separation into the second-level sand-water separator, and the second-level sand-water separator separates water from mineral particles by gravity and filtration. The coal slurry water containing large particles of minerals after separation enters the cyclone concentrator, and the coal slurry water containing small particles of minerals is discharged through the overflow discharge end of the second-level sand-water separator;

[0027] The cyclone concentrator concentrates the coal slime water by rotation, centrifugation and gravity. The coal slime water with slime particle diameter smaller than the second preset diameter R2 overflows and is discharged. The coal slime water with slime particle diameter greater than or equal to the second preset diameter R2 after concentration is input into the pre-screen concentrator of the dehydration screening system.

[0028] As an optional embodiment of the present invention, a coal mine underground thousand-level drainage pretreatment process of the present invention comprises:

[0029] The sludge cyclone of the sludge treatment system receives the coal sludge water in the sludge pool, and the sludge cyclone separates the coal sludge water in the sludge pool through rotation, centrifugation and gravity. After separation, the coal sludge water with a sludge particle diameter smaller than the second preset diameter R2 overflows into the sedimentation and regulating tank, and the coal sludge water with a sludge particle diameter greater than or equal to the second preset diameter R2 circulates into the high-frequency dewatering screen.

[0030] As an optional embodiment of the present invention, a coal mine underground thousand-level drainage pretreatment process of the present invention comprises:

[0031] Monitor the water level of the coal sludge water in the sludge pool, and when it is detected that the current water level reaches a preset water level threshold, start the stirring mechanism in the sludge pool to stir, and then control the feed pump to start working to pump the coal sludge water in the sludge pool into the sludge cyclone;

[0032] Monitor the first flow rate of coal slurry water input from the slurry cyclone to the high-frequency dewatering screen, and the second flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen. When the sum of the first flow rate and the second flow rate is greater than the input flow rate threshold of the high-frequency dewatering screen, reduce or suspend the flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention discloses a coal mine underground thousand-level drainage pretreatment system and process, which pretreats the coal slime water before it enters the central water bin, and the coarse particle separation system realizes the extraction and separation of large-sized mineral slime particles in the coal slime water, and the dehydration and screening system further realizes the screening and separation of mineral slime particles based on the coal slime water treated by the coarse particle separation system. In this way, after the coal slime water is treated by the coarse particle separation system and the dehydration and screening system, the content of mineral slime particles in the coal slime water is greatly reduced, so that after the coal slime water enters the central water bin, the mineral slime particle content is small, thereby reducing the workload of coal slime clearing; in addition, the size of the mineral slime particles in the coal slime water entering the central water bin is very small, which can greatly reduce the wear on the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A system framework diagram of a thousand-level underground coal mine drainage pretreatment system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0037] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] See also Figure 1 As shown in the figure, a coal mine underground thousand-level drainage pretreatment system of this embodiment has a processing capacity of up to 3000m 3 / h, including:

[0042] The coarse particle separation system 100 includes a primary sand-water separator 102 and a solid-liquid separator 104. The feed end of the primary sand-water separator 102 receives coal slurry water from the coal mine, and the particle discharge end of the primary sand-water separator 102 is connected to the feed end of the solid-liquid separator 104. The solid-liquid separator 104 discharges the screened sludge particles from the screen discharge end to the belt conveyor 400 through the screening effect.

[0043] The dewatering and screening system 200 includes a pre-screen concentrator 201 and a high-frequency dewatering screen 202. The overflow discharge end of the primary sand-water separator 102 and the screen under discharge end of the solid-liquid separator 104 are respectively connected to the feed end of the pre-screen concentrator 201. The coal slurry water concentrated by the pre-screen concentrator 201 is connected to the feed end of the high-frequency dewatering screen 202 through the concentrated discharge end. The high-frequency dewatering screen 202 discharges the screened sludge particles from the screen over discharge end to the belt conveyor 400 through the screening effect. The screen under discharge end of the high-frequency dewatering screen 202 is connected to the sludge pool 301.

[0044] A thousand-level underground drainage pretreatment system for a coal mine in the present embodiment pretreats the coal slime water before it enters the central water bin. The coarse particle separation system 100 realizes the extraction and separation of large-sized slime particles in the coal slime water. The dewatering and screening system 200 further realizes the screening and separation of slime particles based on the coal slime water treated by the coarse particle separation system 100. In this way, after the coal slime water is treated by the coarse particle separation system 100 and the dewatering and screening system 200, the content of slime particles in the coal slime water is greatly reduced, so that after the coal slime water enters the central water bin, the slime particle content is small, thereby reducing the workload of coal slime clearing. In addition, the size of slime particles in the coal slime water entering the central water bin is very small, which can greatly reduce the wear on the equipment.

[0045] The primary sand-water separator 102 of this embodiment, also known as the sand-water filter, classifies the coal slurry particles in the coal slurry water by gravity, centrifugation and cyclone. The coarse coal slurry water with particles ≥ 1 mm is pumped into the solid-liquid separator by a slurry pump. The flow rate of the slurry pump is 150m 3 / h.

[0046] The solid-liquid separator 104 of this embodiment specifically adopts an inclined screen solid-liquid separator, and its working principle mainly involves a physical separation process, and solid-liquid separation is achieved through a specific mechanical structure. It is usually composed of a stainless steel flat filter screen surface, and the screen surface is inclined so that the coal slurry water to be treated can be evenly distributed on the screen surface, and the coal slurry particles are trapped, while the filtered coal slurry water flows out from the gaps in the screen plate and is discharged through the screen discharge end. At the same time, under the action of the inclined vibration, the coal slurry particles are pushed to the spiral shaft in the screen and discharged through the screen discharge end, thereby achieving the effect of solid-liquid separation. The solid-liquid separator discharges the screened ≥1mm ore slurry particles from the screen discharge end to the belt conveyor 400 through the screening action.

[0047] The pre-screen concentrator 201 of this embodiment concentrates the coal slurry water by rotation, centrifugation and gravity, and the coal slurry particles are ≤ 0.075mm and 680m 3 / h of coal sludge water overflows and is discharged for further treatment. The concentrated sludge particles are > 0.075mm, 240m 3 / h of coal slime water is discharged into the high-frequency dewatering screen 202.

[0048] The high-frequency dewatering screen 202 of this embodiment dehydrates the coal slime particles by high-frequency linear vibration. The coal slime particles with a diameter greater than 0.2 mm on the screen enter the belt conveyor 400 and are transferred to the mineral flow system, and the coal slime water under the screen flows into the sludge pool 301.

[0049] As an optional implementation of this embodiment, the coarse particle separation system 100 of this embodiment includes a secondary sand-water separator 103, and the overflow discharge end of the primary sand-water separator 102 is connected to the feed end of the pre-screen thickener 201 through the secondary sand-water separator 103, and the feed pump (460m 3 / h, two units) into the pre-screen thickener 201;

[0050] The overflow discharge end of the primary sand-water separator 102 is connected to the feed end of the secondary sand-water separator 103 , and the particle discharge end of the secondary sand-water separator 103 is connected to the feed end of the pre-screen concentrator 201 .

[0051] The secondary sand-water separator 103 of this embodiment further separates water and sand from the coal slurry water overflowed from the primary sand-water separator 102, thereby improving the water-sand separation effect in the coal slurry water.

[0052] Furthermore, the coarse particle separation system 100 of this embodiment includes a cyclone thickener 105, and the particle discharge end of the secondary sand-water separator 103 is connected to the feed end of the pre-screen thickener 201 through the cyclone thickener 105; the particle discharge end of the secondary sand-water separator 103 is connected to the feed end of the cyclone thickener 105, and the coal slurry water concentrated by the cyclone thickener 105 is connected to the feed end of the pre-screen thickener 201 through the concentrated discharge end. The cyclone thickener 105 of this embodiment concentrates the coal slurry water by rotation, centrifugation, and gravity, and the coal slurry water with a diameter of less than 75 microns overflows and is discharged for further treatment, and the concentrated coal slurry water with a diameter of more than 75 microns is pumped into the pre-screen thickener 201.

[0053] The high frequency dewatering screen 202 of this embodiment has a grading particle size of 0.2 mm and a processing capacity of ≤270 m 3 / hour, the above-mentioned cyclone concentrator 105 is a primary concentrator, and the pre-screen concentrator 201 is a secondary concentrator. The flow rate after concentration is less than 270m 3 / hour, meeting the processing capacity requirement of the high-frequency dewatering screen 202.

[0054] The cyclone concentrator 105 of this embodiment is a primary concentrator, and the pre-screen concentrator 201 is a secondary concentrator. After the coal slurry is subjected to two-stage concentrating treatments of the cyclone concentrator 105 and the pre-screen concentrator 201, it is input to the high-frequency dewatering screen 202 to meet the processing capacity of the high-frequency dewatering screen 202. It should be understood by those skilled in the art that when selecting and designing the concentrator and the high-frequency dewatering screen, the processing capacity of the high-frequency dewatering screen 202 is considered to design a two-stage or multi-stage concentrator. Specifically, the high-frequency dewatering screen 202 of this embodiment has a grading particle size of 0.2 mm and a processing capacity of ≤270 m 3 / hour, the above-mentioned cyclone concentrator 105 is a first-stage concentrator, and the pre-screen concentrator 201 is a second-stage concentrator. After the two-stage concentrator, the flow rate is less than 270m 3 / hour, meeting the processing capacity of the high-frequency dewatering screen 202.

[0055] Optionally, the coarse particle separation system of this embodiment includes a slag grater 101, and the coal slurry water in the coal mine is sieved by the slag grater 101 to remove large particles of debris and then enters the primary sand and water separator 102. Specifically, mineral floating objects, wood chips, and large pieces of gangue with a diameter greater than 50 mm in the coal slurry water in the coal mine can be sieved by the slag grater 101.

[0056] Furthermore, a coal mine underground thousand-level drainage pretreatment system of this embodiment includes a sludge treatment system 300, the sludge treatment system 300 includes a mud cyclone 302 and a sedimentation adjustment tank 303, the feed end of the mud cyclone 302 is connected to the sludge tank 301, the mud cyclone 302 cyclones the coal sludge water in the sludge tank through rotation, centrifugation and gravity, and the sludge water in the sludge tank is less than 0.075mm and 150m after cyclone treatment. 3 / h small-particle coal slurry is discharged into the sedimentation and adjustment tank 303 through the overflow discharge end of the slurry cyclone 302. After the cyclone treatment, the particles are larger than 0.075mm and 60m 3 / h of large-particle coal slurry water circulates through the cyclone discharge end of the slurry cyclone 302 and flows into the feed end of the high-frequency dewatering screen 202.

[0057] Specifically, the coal sludge water in the sludge pool 301 is stirred by a stirring mechanism (specifically, a stirring pump) and pumped into the sludge cyclone 302 through a feeding pump. The sludge cyclone 302 cyclones the coal sludge water through rotation, centrifugation and gravity. The coal sludge water with a particle diameter of less than 75 microns overflows into the sedimentation and adjustment tank 303, and the coal sludge water with a particle diameter of more than 75 microns circulates into the high-frequency dewatering screen 202.

[0058] High frequency dewatering screen 202 processing capacity 150m 3 / and, two units, with a grading particle size of 0.2mm, the dry coal slime particles above 0.2mm on the sieve are discharged to the belt conveyor, and the particles below 0.2mm, 210m 3 / h of coal sludge water enters the sludge pool 301.

[0059] In a coal mine underground thousand-level drainage pretreatment system of the present embodiment, a high-frequency dewatering screen 202, a sludge pool 301 and a sludge cyclone 302 constitute an internal self-circulation system. The coal sludge water after screening by the high-frequency dewatering screen 202 is discharged into the sludge pool 301. The coal sludge water in the sludge pool 301 is cycloned by the sludge cyclone 302 and then circulated back to the high-frequency dewatering screen 202 for further treatment, thereby separating the coal sludge particles in the coal sludge water as much as possible, and reducing the coal sludge particle content in the coal sludge water before entering the central water tank as much as possible, thereby solving the problems of heavy workload of coal sludge excavation and equipment wear caused by the high coal sludge content in the coal sludge water.

[0060] At the same time, in a coal mine underground thousand-level drainage pretreatment system of this embodiment, the overflow discharge end of the secondary sand-water separator 103, the overflow discharge end of the cyclone concentrator 105, and the overflow discharge end of the pre-screen concentrator 201 are respectively connected to the sedimentation regulating tank 303.

[0061] In this embodiment, the overflow of the primary sand-water separator 102 with fine particles of less than 1 mm enters the secondary sand-water separator 103. The secondary sand-water separator 103 classifies the coal slurry particles in the coal slurry water through gravity, centrifugal and cyclonic effects. The concentrated coal slurry water is pumped through a slurry pump (slurry pump flow rate 650m 3 / h, 4 units in total, total flow rate 2600m 3 / h) into the cyclone concentrator 105, the secondary sand and water separator 103 overflow ≤ 0.075mm coal slurry, 200m 3 / h enters the sedimentation and adjustment tank 303. The cyclone concentrator 105 overflows by centrifugal and cyclonic action ≤ 0.075mm, 1800m 3 / h coal slurry and the overflow of the secondary sand-water separator 103 are merged into the sedimentation regulating tank 303. <0.075mm, 800m 3 / h concentrated coal slime water and solid-liquid separator under sieve <1mm, 120m 3 / h of coal slurry water is merged into the feed bucket of the pre-screen concentrator 201.

[0062] Therefore, in this embodiment, by setting up a sedimentation regulating tank 303, the incoming coal slurry water particles are less than 0.075 mm, and by setting up a sludge tank 301, the incoming coal slurry water particles are less than 0.2 mm.

[0063] Furthermore, the sludge treatment system 300 described in this embodiment includes a micro-sand settler 304 and a water-sand cyclone 305, the feed end of the micro-sand settler 304 is connected to the sedimentation and regulating tank 303, the sedimentation discharge end of the micro-sand settler 304 is connected to the feed end of the water-sand cyclone 305, and the water outlet end of the micro-sand settler 304 is connected to the central water tank; the water-sand cyclone 305 extracts micro-sand from the coal sludge water through rotation, centrifugation and gravity, and circulates into the sedimentation and regulating tank 303 through the cyclone discharge end of the water-sand cyclone 305, and discharges the coal sludge water into the sludge tank 301 through the overflow discharge end of the water-sand cyclone 305, and circulates the treatment again.

[0064] The coal slime water in the sedimentation and adjustment tank 303 of this embodiment is stirred by adding micro sand (including reagents) to flocculate and polymerize the fine coal slime particles in the coal slime water, and the polymer and the coal slime water flow into the micro sand sedimentator 304 together.

[0065] The micro-sand settler 304 of this embodiment, through the inclined plate settling action, the sediment is pumped into the water-sand cyclone for separation, the micro-sand is reused repeatedly, the coal sludge water overflows to the sludge pool 301 for repeated treatment, and the overflow water flows into the central water tank.

[0066] In the present embodiment, a coal mine underground thousand-level drainage pretreatment system, a sedimentation regulating tank 303, a micro-sand settler 304 and a water-sand cyclone 305 constitute an internal self-circulation system, and the coal slime water in the sedimentation regulating tank 303 is circulated for treatment, so as to separate the coal slime particles in the coal slime water as much as possible, and to reduce the coal slime particle content before the coal slime water enters the central water tank as much as possible, so as to solve the problems of heavy coal slime excavation workload and equipment wear caused by the high coal slime content in the coal slime water.

[0067] This embodiment also provides a coal mine underground thousand-level drainage pretreatment process of the coal mine underground drainage pretreatment system, including:

[0068] The primary sand-water separator of the coarse particle separation system receives the coal slime water in the coal mine, separates the water in the coal slime water from the large-particle minerals by gravity and filtration, and the coal slime water containing the large-particle minerals enters the solid-liquid separator after separation, and the coal slime water containing the small-particle minerals enters the dehydration screening system. The solid-liquid separator screens the coal slime water containing the large-particle minerals by screening, and the mineral slime particles with a diameter greater than or equal to the first preset diameter R1 on the screen enter the belt conveyor, and the coal slime water under the screen enters the dehydration screening system;

[0069] The pre-screen concentrator of the dewatering and screening system receives the coal slurry water output by the primary sand-water separator and the solid-liquid separator respectively. The pre-screen concentrator concentrates the coal slurry water by rotation, centrifugation and gravity. The coal slurry water with a diameter of ore particles smaller than the second preset diameter R2 overflows and is discharged. The concentrated coal slurry water with a diameter of ore particles greater than or equal to the second preset diameter R2 is input into the high-frequency dewatering screen. The high-frequency dewatering screen dehydrates the ore slurry particles by high-frequency linear vibration. The ore slurry particles with a diameter greater than or equal to the third preset diameter R3 on the screen enter the belt conveyor, and the coal slurry water under the screen flows into the sludge pool.

[0070] Wherein, the first preset diameter R1>the second preset diameter R2>the third preset diameter R3.

[0071] A thousand-level underground drainage pretreatment process of a coal mine in the present embodiment pretreats the coal slime water before it enters the central water bin, and the coarse particle separation system realizes the extraction and separation of large-sized slime particles in the coal slime water, and the dehydration and screening system further realizes the screening and separation of slime particles based on the coal slime water treated by the coarse particle separation system. In this way, after the coal slime water is treated by the coarse particle separation system and the dehydration and screening system, the content of slime particles in the coal slime water is greatly reduced, so that after the coal slime water enters the central water bin, the slime particle content is small, thereby reducing the workload of coal slime clearing; in addition, the size of slime particles in the coal slime water entering the central water bin is very small, which can greatly reduce the wear on equipment.

[0072] Specifically, in this embodiment, the first preset diameter R1 = 1 mm, the second preset diameter R2 = 75 μm, and the third preset diameter R3 = 0.2 mm.

[0073] As an optional implementation of this embodiment, in a coal mine underground thousand-level drainage pretreatment process of this embodiment, the primary sand-water separator of the coarse particle separation system separates the water from the large particle minerals in the coal slurry water by gravity and filtration, and the coal slurry water containing small particle minerals enters the dehydration screening system, including:

[0074] The first-level sand-water separator inputs the coal slurry water containing small particles of minerals after separation into the second-level sand-water separator, and the second-level sand-water separator separates water from mineral particles by gravity and filtration. The coal slurry water containing large particles of minerals after separation enters the cyclone concentrator, and the coal slurry water containing small particles of minerals is discharged through the overflow discharge end of the second-level sand-water separator;

[0075] The cyclone concentrator concentrates the coal slime water by rotation, centrifugation and gravity. The coal slime water with slime particle diameter smaller than the second preset diameter R2 overflows and is discharged. The coal slime water with slime particle diameter greater than or equal to the second preset diameter R2 after concentration is input into the pre-screen concentrator of the dehydration screening system.

[0076] In this embodiment, a coal mine underground thousand-level drainage pretreatment process is provided, in which a secondary sand-water separator and a cyclone concentrator further separate water and sand from the coal slurry water overflowed from the primary sand-water separator, thereby improving the water-sand separation effect in the coal slurry water.

[0077] Furthermore, a coal mine underground thousand-level drainage pretreatment process of this embodiment includes:

[0078] The sludge cyclone of the sludge treatment system receives the coal sludge water in the sludge pool, and the sludge cyclone separates the coal sludge water in the sludge pool through rotation, centrifugation and gravity. After separation, the coal sludge water with a sludge particle diameter smaller than the second preset diameter R2 overflows into the sedimentation and regulating tank, and the coal sludge water with a sludge particle diameter greater than or equal to the second preset diameter R2 circulates into the high-frequency dewatering screen.

[0079] A coal mine underground thousand-level drainage pretreatment process of the present embodiment performs regular re-treatment on the coal sludge water in the sludge pool, and circulates the treated coal sludge water back to the high-frequency dewatering screen for further screening, thereby forming a self-circulation within the system, thereby separating the coal sludge particles in the coal sludge water as much as possible, and minimizing the coal sludge particle content in the coal sludge water before it enters the central water bin, thereby solving the problems of heavy coal sludge excavation workload and equipment wear caused by the high coal sludge content in the coal sludge water.

[0080] As an optional implementation of this embodiment, a coal mine underground thousand-level drainage pretreatment process of this embodiment includes:

[0081] Monitor the water level of the coal sludge water in the sludge pool, and when it is detected that the current water level reaches a preset water level threshold, start the stirring mechanism in the sludge pool to stir, and then control the feed pump to start working to pump the coal sludge water in the sludge pool into the sludge cyclone;

[0082] Monitor the first flow rate of coal slurry water input from the slurry cyclone to the high-frequency dewatering screen, and the second flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen. When the sum of the first flow rate and the second flow rate is greater than the input flow rate threshold of the high-frequency dewatering screen, reduce or suspend the flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen.

[0083] The coal sludge input to the high-frequency dewatering screen in this embodiment comes from the pre-screen concentrator and the sludge cyclone at the same time, and the coal sludge water in the sludge cyclone comes from the sludge pool. The coal sludge water in the sludge pool is treated regularly rather than in real time. Therefore, when it is monitored that the current water level of the coal sludge water in the sludge pool reaches the preset water level threshold, it is necessary to give priority to the coal sludge water in the sludge pool to ensure that the underground thousand-level drainage pretreatment system of a coal mine in this embodiment can operate normally.

[0084] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A coal mine underground thousand-level drainage pretreatment system, characterized in that: include: The coarse particle separation system includes a primary sand-water separator and a solid-liquid separator. The feed end of the primary sand-water separator receives the coal slurry water from the coal mine, and the particle discharge end of the primary sand-water separator is connected to the feed end of the solid-liquid separator. The solid-liquid separator discharges the screened ore slurry particles from the screen discharge end to the belt conveyor through the screening action. The dewatering and screening system comprises a pre-screen concentrator and a high-frequency dewatering screen. The overflow discharge end of the primary sand-water separator and the screen under discharge end of the solid-liquid separator are respectively connected to the feed end of the pre-screen concentrator. The coal slurry water concentrated by the pre-screen concentrator is connected to the feed end of the high-frequency dewatering screen through the concentrated discharge end. The high-frequency dewatering screen discharges the screened ore sludge particles from the screen over discharge end to the belt conveyor through the screening action. The screen under discharge end of the high-frequency dewatering screen is connected to the sludge pool.

2. A coal mine underground thousand-level drainage pretreatment system according to claim 1, characterized in that: The coarse particle separation system comprises a secondary sand-water separator, and the overflow discharge end of the primary sand-water separator is connected to the feed end of the pre-screen thickener through the secondary sand-water separator; The overflow discharge end of the primary sand-water separator is connected to the feed end of the secondary sand-water separator, and the particle discharge end of the secondary sand-water separator is connected to the feed end of the pre-screen concentrator.

3. A coal mine underground thousand-level drainage pretreatment system according to claim 2, characterized in that: The coarse particle separation system includes a cyclone concentrator, and the particle discharge end of the secondary sand-water separator is connected to the feed end of the pre-screen concentrator through the cyclone concentrator; The particle discharge end of the secondary sand-water separator is connected to the feed end of the cyclone concentrator, and the coal slime water after the cyclone concentrator concentration treatment is connected to the feed end of the pre-screen concentrator through the concentration discharge end; Optionally, the coarse particle separation system includes a slag grid machine, and the coal slime water in the coal mine is sieved by the slag grid machine to remove large particles of debris and then enters the primary sand and water separator.

4. A coal mine underground thousand-level drainage pretreatment system according to claim 3, characterized in that: The utility model comprises a sludge treatment system, wherein the sludge treatment system comprises a sludge cyclone and a sedimentation regulating tank. The feed end of the sludge cyclone is connected to the sludge tank. The sludge cyclone cyclones the coal sludge water in the sludge tank through rotation, centrifugation and gravity. The small-particle coal sludge water after cyclone treatment is discharged to the sedimentation regulating tank through the overflow discharge end of the sludge cyclone. The large-particle coal sludge water after cyclone treatment is circulated through the cyclone discharge end of the sludge cyclone and flows into the feed end of the high-frequency dewatering screen.

5. A coal mine underground thousand-level drainage pretreatment system according to claim 4, characterized in that: The overflow discharge end of the secondary sand-water separator, the overflow discharge end of the cyclone concentrator, and the overflow discharge end of the pre-screen concentrator are respectively connected to the sedimentation regulating tank.

6. A coal mine underground thousand-level drainage pretreatment system according to claim 4, characterized in that: The sludge treatment system comprises a micro-sand sedimentator and a water-sand cyclone, wherein the feed end of the micro-sand sedimentator is connected to the sedimentation regulating tank, the sedimentation discharge end of the micro-sand sedimentator is connected to the feed end of the water-sand cyclone, and the water outlet end of the micro-sand sedimentator is connected to the central water tank; The water-sand cyclone extracts micro-sand from the coal slurry water through rotation, centrifugation and gravity, and circulates the micro-sand into the sedimentation regulating tank through the cyclone discharge end of the water-sand cyclone, and discharges the coal slurry into the sludge tank through the overflow discharge end of the water-sand cyclone for further circulated treatment.

7. A coal mine underground thousand-level drainage pretreatment process of the coal mine underground thousand-level drainage pretreatment system according to any one of claims 1 to 6, characterized in that: include: The primary sand-water separator of the coarse particle separation system receives the coal slime water in the coal mine, separates the water in the coal slime water from the large-particle minerals by gravity and filtration, and the coal slime water containing the large-particle minerals enters the solid-liquid separator after separation, and the coal slime water containing the small-particle minerals enters the dehydration screening system. The solid-liquid separator screens the coal slime water containing the large-particle minerals by screening, and the mineral slime particles with a diameter greater than or equal to the first preset diameter R1 on the screen enter the belt conveyor, and the coal slime water under the screen enters the dehydration screening system; The pre-screen concentrator of the dewatering and screening system receives the coal slurry water output by the primary sand-water separator and the solid-liquid separator respectively. The pre-screen concentrator concentrates the coal slurry water by rotation, centrifugation and gravity. The coal slurry water with a diameter of ore particles smaller than the second preset diameter R2 overflows and is discharged. The concentrated coal slurry water with a diameter of ore particles greater than or equal to the second preset diameter R2 is input into the high-frequency dewatering screen. The high-frequency dewatering screen dehydrates the ore slurry particles by high-frequency linear vibration. The ore slurry particles with a diameter greater than or equal to the third preset diameter R3 on the screen enter the belt conveyor, and the coal slurry water under the screen flows into the sludge pool. Wherein, the first preset diameter R1>the second preset diameter R2>the third preset diameter R3.

8. A coal mine underground thousand-level drainage pretreatment process according to claim 7, characterized in that: The primary sand-water separator of the coarse particle separation system separates the water from the large particles of minerals in the coal slime water by gravity and filtration, and the coal slime water containing small particles of minerals enters the dehydration screening system, including: The first-level sand-water separator inputs the coal slurry water containing small particles of minerals after separation into the second-level sand-water separator, and the second-level sand-water separator separates water from mineral particles by gravity and filtration. The coal slurry water containing large particles of minerals after separation enters the cyclone concentrator, and the coal slurry water containing small particles of minerals is discharged through the overflow discharge end of the second-level sand-water separator; The cyclone concentrator concentrates the coal slime water by rotation, centrifugation and gravity. The coal slime water with slime particle diameter smaller than the second preset diameter R2 overflows and is discharged. The coal slime water with slime particle diameter greater than or equal to the second preset diameter R2 after concentration is input into the pre-screen concentrator of the dehydration screening system.

9. A coal mine underground thousand-level drainage pretreatment process according to claim 7, characterized in that: include: The sludge cyclone of the sludge treatment system receives the coal sludge water in the sludge pool, and the sludge cyclone separates the coal sludge water in the sludge pool through rotation, centrifugation and gravity. After separation, the coal sludge water with a sludge particle diameter smaller than the second preset diameter R2 overflows into the sedimentation and regulating tank, and the coal sludge water with a sludge particle diameter greater than or equal to the second preset diameter R2 circulates into the high-frequency dewatering screen.

10. A coal mine underground thousand-level drainage pretreatment process according to claim 9, characterized in that: include: Monitor the water level of the coal sludge water in the sludge pool, and when it is detected that the current water level reaches a preset water level threshold, start the stirring mechanism in the sludge pool to stir, and then control the feed pump to start working to pump the coal sludge water in the sludge pool into the sludge cyclone; Monitor the first flow rate of coal slurry water input from the slurry cyclone to the high-frequency dewatering screen, and the second flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen. When the sum of the first flow rate and the second flow rate is greater than the input flow rate threshold of the high-frequency dewatering screen, reduce or suspend the flow rate of coal slurry water input from the pre-screen concentrator to the high-frequency dewatering screen.

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