CN116062939A

CN116062939A - System and method for treating and recycling underground coal slime water of coal mine

Info

Publication number: CN116062939A
Application number: CN202310097637.6A
Authority: CN
Inventors: 田康; 唐建军; 晋树青; 牛明明; 张江涛; 任浩; 王鹏; 杜军; 王勇; 张强
Original assignee: Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co ltd
Current assignee: Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-05-05

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a system and a method for treating and recycling coal slime water in a coal mine; the system comprises a water-sand separation unit for removing large-particle-size particles in the slime water, a pretreatment unit for removing suspended particles, gelatinous substances and floccules in the slime water by precipitation, a coagulation reaction unit for agglomerating the suspended substances and magnetic seeds in the water to form magnetic alum flowers by adding magnetic seed media and flocculating agents, a super-magnetic separation treatment unit for rapidly separating the magnetic floccules under the action of a high-strength magnetic field generated by a permanent magnetic material, and a precise filtration unit for reducing the content of soluble solid suspended substances and metal ions in the slime water by a flat ceramic membrane and reverse osmosis membrane purification filtration mode; the underground coal slime water treatment recycling system for the coal mine effectively reduces the underground coal slime water treatment difficulty, avoids sump siltation, improves the underground recycling degree of the mine well, and realizes the efficient utilization of mine water resources.

Description

System and method for treating and recycling underground coal slime water of coal mine

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a system and a method for treating and recycling underground coal slime water of a coal mine.

Background

The emission of mine water and slime water produced in the mine of China every year is the first in the world, and slime water is mixed by water, coal particles, coal dust, rock dust and the like and is sourced from fully mechanized mining face, tunneling face, bottom-pumping roadway drilling, kilometer drilling machine sites and the like. The coal cinder content is large, the suspended solids content of the coal slime rock powder is high, so that the water sump in a disc area and the water sump in the center are seriously deposited, the water sump is always in a state of 'one-sump-water-half-sump mud', the effective volume of the water sump is seriously influenced, the energy consumption of water discharge is seriously formed, the abrasion and maintenance cost of pump house and pipe network equipment is high, the water sump is frequently subjected to dredging, and the water sump is deposited to influence the safe and effective volume.

The disc area water sump is generally dredged by a sump dredger, the dredging period of the outer sump is 50-60 days, the dredging period of the inner sump is 20-30 days, the dredging time is long, and the standby water sump is full of water sump coal slime during dredging, so that the drainage efficiency is seriously affected. Meanwhile, the traditional method has low mechanization level, high risk coefficient, high labor intensity and low cleaning efficiency. The conventional treatment of underground slime water mainly removes particles, but mine water with only removing the impurities of the particles such as coal particles, coal dust, rock dust and the like can not meet the requirement of deep recycling. The conventional process currently employed for slime water treatment is "primary sedimentation-coagulation-sedimentation-filtration". The primary sedimentation mode is an inclined plate sedimentation tank transformed by a roadway, but coal slime sediment precipitated in a short period cannot be effectively discharged, so that the labor intensity of manual dredging is increased. The dosage is large in the coagulation process, the reaction time is long, and the treatment cost is high. The effluent water treated by the conventional process is low in quality and still contains organic matters, nitrogen and ammonia, emulsified oil, calcium and magnesium salts and various metal ions, the treated coal slime water cannot meet the underground water requirement and cannot be recycled in situ, and finally is discharged to the ground through a water pump house, so that the energy consumption is increased.

In a word, the recycling treatment of the slime water firstly needs to solve the problem of slime deposition. And secondly, transferring the ground slime water treatment flow to underground direct treatment. And thirdly, the coal slime water is directly subjected to advanced treatment underground, the ground emission of the coal slime water can be reduced by recycling the high-quality water outlet, the water shortage of underground coiled areas is supplemented, the recycled coal slime can be also subjected to secondary utilization, the energy is saved, the emission is reduced, the resource utilization is improved, and the environmental pollution is reduced.

Therefore, the system and the method for directly treating and recycling the slime water underground can save energy consumption and reduce the phenomenon of accumulation of underground water bins, simultaneously realize the precise filtration treatment of mine water underground, realize the high-efficiency utilization of mine water resources and have important significance for the safe production and sustainable development of coal mines.

Disclosure of Invention

The invention aims to provide a system for treating and recycling underground coal slime water of a coal mine, which reduces the difficulty of underground coal slime water treatment, avoids sump accumulation, reduces lifting energy consumption, improves the removal efficiency of particles in the coal slime water, improves the underground recycling degree of the coal mine, realizes the efficient utilization of the water resources of the coal mine and solves the problems in the background art.

The technical scheme adopted for solving the technical problems is as follows: the underground coal slime water treatment and recycling system for the coal mine comprises a water sand separation unit for removing large-particle-size particles in the slime water, a pretreatment unit for removing suspended particles, gelatinous substances and floccules in the slime water through precipitation, a coagulation reaction unit for forming magnetic 'alum blossom' by coagulating the suspended substances and the magnetic seeds in the water together by adding a magnetic seed medium and a flocculating agent, a super-magnetic separation treatment unit for rapidly separating the magnetic floccules under the action of a high-intensity magnetic field generated by a permanent magnetic material, and a precise filtration unit for reducing the content of soluble solid suspended substances and metal ions in the slime water through a flat ceramic membrane and reverse osmosis membrane purification filtration mode; the water sand separation unit, the pretreatment unit, the coagulation reaction unit, the super-magnetic separation treatment unit and the precise filtration unit are sequentially connected through pipelines.

Further, the water-sand separation unit comprises a collecting tank, a filter screen, rake teeth, a traction chain, a guiding device and a driving device;

the filter screen is arranged in the collecting tank, the collecting tank is divided into a mud water area and a sewage area, the filter screen comprises a primary filter screen, a high-density filter screen and a filter screen collecting hopper, the filter screen collecting hopper is connected between the primary filter screen and the bottom of the high-density filter screen, an outlet of the filter screen collecting hopper is positioned above the main ore conveying adhesive tape after passing through the collecting tank, and a shutter plate capable of being opened and closed is arranged on the filter screen collecting hopper;

the traction chain is guided and supported by the guide devices at the two ends and driven by the driving device to circularly rotate, the rake teeth are distributed on the traction chain, and the traction chain drives the rake teeth to salvage sundries filtered by the primary filter screen.

Further, the pretreatment unit comprises a multistage pre-sedimentation tank and a mining slurry pump, the mining slurry pump is arranged at the bottom of the multistage pre-sedimentation tank, and the mining slurry pump can convey coal slime impurities precipitated in the pre-sedimentation tank to the sludge collecting tank through a sludge pipe.

Further, a plurality of aeration pipes and a plurality of sloping plates are arranged in the multistage pre-sedimentation tank, and the sloping plates are arranged in layers in the multistage pre-sedimentation tank; one end of the sloping plate is hinged with the pool wall, and the other end of the sloping plate is connected with a sloping plate traction rod which is connected with a traction motor through a steel wire; balance connecting rods in one-to-one correspondence with the inclined plates are fixed in the multistage pre-sedimentation tank, and springs are connected between the balance connecting rods and the inclined plates; the top of the multistage pre-sedimentation tank is provided with a compressed air pump, and the compressed air pump supplies air to an aeration pipe in the tank through a compressed air pipeline; the aeration pipe is arranged below the sloping plate, and the aeration pipe blows compressed air to the sloping plate through the aeration hole.

Further, the horizontal inclination angle of the inclined plate is 30-55 degrees, the turnover angle range of the inclined plate is 30-90 degrees, and the vertical arrangement interval of the inclined plate is 40-60 cm; the aeration holes on the aeration pipe are round holes, the aeration holes are uniformly distributed on the aeration pipe, the aperture of the aeration holes is 10-20 mm, and the arrangement interval of the aeration holes is 5-10 cm.

Further, the coagulation reaction unit comprises a mixing stirring tank, a primary reaction tank and a curing reaction tank which are sequentially connected through pipelines; a coagulant feeding pump is arranged on the mixing and stirring tank, and a coagulant aid feeding pump and a magnetic seed feeding pump are arranged on the primary reaction tank; the mixing stirring tank, the primary reaction tank and the curing reaction tank are respectively provided with a mining stirrer.

Further, the super-magnetic separation processing unit comprises a super-magnetic separation host and a security tank which are sequentially connected through pipelines.

Further, the precise filtering unit comprises a flat ceramic membrane filter and a reverse osmosis membrane filter which are sequentially connected through pipelines; the reverse osmosis membrane filter comprises a cartridge filter, a reverse osmosis device and a scale inhibitor adding device which are sequentially connected through pipelines.

The invention also aims to provide a method for treating and recycling the coal mine underground slime water, which adopts the system for treating and recycling the coal mine underground slime water and comprises the following steps:

s1, enabling underground coal slime water of a coal mine to enter a water-sand separation unit, and removing large-particle-size particles with the particle size of more than 5.0mm from the slime water; the method is used for reducing the sedimentation frequency of the underground water sump and the load of a subsequent treatment unit;

s2, allowing the slime water in the step S1 to enter a pretreatment unit for precipitation, wherein suspended matters in the precipitated slime water are smaller than 1000mg/L;

s3, enabling the coal slime water in the step S2 to enter a coagulation reaction unit, connecting a coagulant feeding pump with a mixing and stirring tank, feeding 100-500 mg/L polyaluminium chloride (PAC) into the mixing and stirring tank through the coagulant feeding pump, fully stirring the mixing and stirring tank through a mining stirrer, and enabling the coal slime water to enter a primary reaction tank; 5-10 mg/L Polyacrylamide (PAM) is added into the primary reaction tank through a coagulant aid feeding pump, and 10-30mg/L magnetic seeds (Fe) are added into the primary reaction tank through a magnetic seed feeding pump ₃ O ₄ ) Fully stirring the primary reaction tank by a mining stirrer, and then enabling the coal slime water to enter a curing reaction tank; the curing reaction tank forms magnetic alum blossom with PAC, PAM and magnetic seeds under the action of a mining stirrer.

S4, enabling the coal slime water in the step S3 to enter a super-magnetic separation treatment unit, wherein the super-magnetic separation treatment unit comprises a super-magnetic separation main machine and a security tank which are sequentially connected through a pipeline, a check valve is arranged in the security tank, clear water treated by the super-magnetic separation main machine is prevented from flowing back, and suspended matters in the coal slime water after super-magnetic separation are smaller than 30mg/L;

s5, enabling the slime water in the step S4 to enter a precise filtering unit, wherein the precise filtering unit comprises a flat ceramic membrane filter and a reverse osmosis membrane filter which are sequentially connected through pipelines, and recycling effluent; the step is to further remove the soluble solids and calcium, sodium and magnesium plasma in the mine water through a flat ceramic membrane filter and a reverse osmosis membrane filter respectively, so as to improve the water quality of the effluent recycling of the whole system.

Compared with the prior art, the invention has the advantages that:

(1) Compared with the treatment of a ground sewage plant, the underground advanced treatment of the coal slime water can save the energy consumption cost of the coal slime water, and avoid the influence of other pollutants on the environment in the ground coal slime water treatment.

(2) The invention constructs the deep treatment system of the slime water in front of the water sump or the central water warehouse in the underground disc area, plays the roles of separating mud from water and putting clean water into the water sump, and can collect most of sludge such as slime, cinder and the like in the slime water compared with the post treatment in the underground water sump, thereby realizing the efficient utilization of the slime water, changing waste into valuables, simultaneously effectively preventing the slime sludge in the water sump or the central water warehouse, reducing the dredging operation intensity and frequency and guaranteeing the safety production of mines.

(3) Compared with the existing underground gravity sedimentation tank technology, the invention adds a plurality of layers of sloping plate components in the multistage pre-sedimentation tank of the pretreatment unit, improves the sedimentation speed of suspended matters in the coal slime water by utilizing the shallow tank sedimentation principle, lays an aeration pipe at the bottom of the sloping plate by adding a mechanical tilting mechanism on the sloping plate, and can clean the high-concentration high-viscosity coal slime after being deposited on the sloping plate by adjusting the sloping plate tilting and the aeration pipe blowing so as to prevent the sedimentation effect of the sloping plate from being reduced due to long-term operation.

(4) Compared with the existing slime water treatment technology, the invention has the advantages that the suspended matters and the magnetic seeds in the water body are coagulated together to form the magnetic alum flowers by adding the magnetic seed medium and the flocculating agent, the magnetic alum flowers are rapidly separated under the action of the high-intensity magnetic field generated by the permanent magnetic materials in the super-magnetic separation treatment unit, and the pertinence and the broad spectrum of removing the particles with different particle diameters in the slime water are improved by combining the automatic control technology.

(5) The invention expands the underground slime water treatment process flow, adds a precise filtering unit, further carries out advanced treatment on the mine water treated by the super-magnetic separation unit by utilizing a flat ceramic membrane filter and a reverse osmosis membrane filter, removes soluble solids, calcium, sodium, magnesium and other ions in the mine water, meets the underground requirement, and realizes the high-efficiency recycling of the slime water.

Drawings

FIG. 1 is a schematic diagram of the system architecture of the present invention;

FIG. 2 is a schematic view of the structure of the water-sand separation unit of the present invention;

FIG. 3 is a schematic view of the structure of the filter screen of the water sand separating unit of the present invention;

FIG. 4 is a schematic diagram of the structure of a multistage pre-sedimentation tank in the present invention;

FIG. 5 is a schematic diagram of the structure of a coagulation reaction unit in the present invention.

In the figure: 1. the device comprises a water sand separation unit, 2, a pretreatment unit, 3, a coagulation reaction unit, 4, a super-magnetic separation treatment unit, 5, a precise filtration unit, 11 filter screens, 12, rake teeth, 13, a traction chain, 14, a guiding device, 15, a motor shield, 16, a driving device, 17, a sundry storage box, 18, a collecting tank, 21, a multistage pre-sedimentation tank, 22, a mining slurry pump, 23, a sludge pipe, 31, a mixing tank, 32, a mining stirrer, 33, a primary reaction tank, 34, a curing reaction tank, 35, a coagulant feeding pump, 36, a coagulant aid feeding pump, 37 magnetic seed feeding pump, 41, a super-magnetic separation host, 42, a security pot, 51, a flat ceramic membrane filter, 52, a reverse osmosis membrane filter, 101, a primary filter screen, 102, a high-density filter screen, a 103 filter screen collecting hopper, 104, an ore main operation tape, 220, a balance link, 221, a sloping plate, 222, an aeration hole, 223, an air pipe, 224, a compression pump, 226, a sloping plate, 227, a traction motor, 229 and a compression air pump.

Detailed Description

In order to relieve a series of safety problems caused by serious coal mine underground water sump siltation and frequent sump cleaning, the invention converts the coal slime water treatment concept from traditional underground water sump accumulation to ground lifting treatment before entering the underground water sump for direct treatment, can save the energy consumption cost of ground lifting treatment of coal slime water, improve the utilization rate of coal slime, and avoid the problems of serious underground water sump siltation, frequent sump cleaning, abrasion of drainage water pump pipeline equipment and the like. Meanwhile, the invention uses magnetic seed medium and flocculating agent to coagulate the suspended matters and magnetic seeds in the water body of the slime water to form magnetic alum, and the technology of quickly separating the magnetic alum clusters under the action of strong magnetic field by means of the high-strength magnetic field generated by the permanent magnetic material can remove the particles with different particle diameters in the slime water, reduce the content of soluble solid suspended matters and metal ions in the slime water by a flat ceramic membrane and reverse osmosis membrane purification filtration mode, and expand the technological process of slime water deep treatment, thus forming the underground slime water treatment and recycling system and method of the coal mine.

The technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings. It should be understood that the practice of the invention is not limited to the following examples, but is intended to be within the scope of the invention in any form and/or modification thereof.

In the present invention, unless otherwise specified, all parts and percentages are by weight, and the equipment, materials, etc. used are commercially available or are conventional in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components and devices in the following examples are, unless otherwise indicated, all those components and devices known to those skilled in the art, and their structures and principles are known to those skilled in the art from technical manuals or by routine experimentation.

Example 1

As shown in fig. 1: the system comprises a water-sand separation unit 1 for removing large-particle-size particles in slime water, a pretreatment unit 2 for removing suspended particles, colloidal substances and floccules in the slime water by precipitation, a coagulation reaction unit 3 for agglomerating the suspended substances and the magnetic seeds in the water body by adding a magnetic seed medium and a flocculating agent to form magnetic alum flowers, a super-magnetic separation treatment unit 4 for quickly separating the magnetic floccules under the action of a high-intensity magnetic field generated by a permanent magnetic material, and a precise filtration unit 5 for reducing the content of soluble solid suspended substances and metal ions in the slime water by a flat ceramic membrane and reverse osmosis membrane purification filtration mode; the water sand separation unit 1, the pretreatment unit 2, the coagulation reaction unit 3, the super-magnetic separation treatment unit 4 and the precise filtration unit 5 are sequentially connected through pipelines.

As shown in fig. 2 and 3: the water and sand separation unit 1 comprises a collecting tank 18, a filter screen 11, rake teeth 12, a traction chain 13, a guiding device 14 and a driving device 16.

The filter screen 11 is arranged in the collecting tank 18 to divide the collecting tank 18 into a mud water area and a sewage area, the filter screen 11 comprises a primary filter screen 101, a high-density filter screen 102 and a filter screen collecting hopper 103, the filter screen collecting hopper 103 is connected between the primary filter screen 101 and the bottom of the high-density filter screen 102, an outlet of the filter screen collecting hopper 103 after passing through the collecting tank 18 is positioned above an ore main conveying adhesive tape 105, and a shutter which can be opened and closed is arranged on the filter screen collecting hopper 103; during normal filtering operation, the flashboard is closed, and when sludge between the primary filter screen 101 and the high-density filter screen 102 is accumulated to a certain degree, the flashboard opens the sludge discharge, and the valve at the upstream of the water-sand separation unit 1 is closed during the sludge discharge.

The traction chain 13 is guided and supported by guide devices 14 at two ends and driven by a driving device 16 to circularly rotate, the rake teeth 12 are distributed on the traction chain 13, and the traction chain 13 drives the rake teeth 12 to salvage sundries filtered by the primary filter screen 101.

The pretreatment unit 2 comprises a multistage pre-sedimentation tank 21 and a mining slurry pump 22, wherein the mining slurry pump 22 is arranged at the bottom of the multistage pre-sedimentation tank 21, and the mining slurry pump 22 can convey coal slime impurities precipitated in the pre-sedimentation tank 21 to a sludge collecting tank through a sludge pipe 23.

As shown in fig. 4: the multistage pre-sedimentation tank 21 is square conical, a plurality of aeration pipes 223 and a plurality of sloping plates 221 are arranged in the multistage pre-sedimentation tank 21, and the sloping plates 221 are arranged in the multistage pre-sedimentation tank 21 in a layered manner; one end of the sloping plate 221 is hinged with the pool wall, the other end is connected with a sloping plate traction rod 226, and the sloping plate traction rod 226 is connected with a traction motor 227 through a steel wire; balance connecting rods 220 in one-to-one correspondence with the inclined plates 221 are fixed in the multistage pre-sedimentation tank 21, and springs are connected between the balance connecting rods 220 and the inclined plates 221; the top of the multistage pre-sedimentation tank 21 is provided with a compressed air pump 229, and the compressed air pump 229 supplies air to the aeration pipe 223 in the tank through a compressed air pipeline 224; an aeration pipe 223 is provided below the inclined plate 221, and the aeration pipe 223 blows compressed air toward the inclined plate 221 through the aeration hole 222.

The deposited coal slurry on the inclined plate 221 in the multistage pre-precipitation tank 21 is removed by means of mechanical inversion and aeration disturbance. The inclined plate 221 is driven by a traction motor 227 to rotate through a traction steel wire, the inclined plate 221 is reset under the action of a spring after the traction motor 227 is unloaded, and an overturning dredging working period of the inclined plate 221 is completed. Meanwhile, bubbles generated by the aeration pipe 223 can collide with the disturbance swash plate 221 to adhere to the coal slime, so that the coal slime is prevented from being deposited.

The horizontal inclination angle of the inclined plate 221 is 30-55 degrees, the reversible angle range of the inclined plate 221 is 30-90 degrees, and the vertical arrangement interval of the inclined plate 221 is 40-60 cm; the aeration holes 222 on the aeration pipe 223 are round holes, the aeration holes 222 are uniformly distributed on the aeration pipe 223, the aperture of the aeration holes 222 is 10-20 mm, and the arrangement interval of the aeration holes is 5-10 cm; in this example, the pore diameter of the aeration pores on the aeration pipe was 8mm, and the pore spacing was 10cm.

As shown in fig. 5: the coagulation reaction unit 3 comprises a mixing stirring tank 31, a primary reaction tank 33 and a curing reaction tank 34 which are sequentially connected through pipelines; a coagulant feeding pump 35 is arranged on the mixing and stirring tank 31, and a coagulant aid feeding pump 36 and a magnetic seed feeding pump 37 are arranged on the primary reaction tank 33; the mixing and stirring tank 31, the primary reaction tank 33 and the aging reaction tank 34 are each provided with a mining stirrer 32.

The mixing stirring tank 31 is internally provided with a mixing stirring paddle 311, the top of the mixing stirring paddle 311 is connected with a mining stirrer 32 extending out of the tank top of the mixing stirring tank 31, and the top of the mixing stirring tank 31 is connected with a polyaluminium chloride (PAC) coagulant feeding pump 35.

A flocculation stirring paddle 331 is arranged in the primary reaction tank 33, the top of the flocculation stirring paddle 331 is connected with a mining stirrer 32 extending out of the top of the primary reaction tank 33, and the top of the primary reaction tank 33 is connected with a Polyacrylamide (PAM) coagulant aid feeding pump 36 and magnetic seeds (Fe) ₃ O ₄ ) A magnetic seed feeding pump 37.

The curing reaction tank 34 is internally provided with a curing stirring paddle 341, and the top of the curing stirring paddle 341 is connected with a mining stirrer 32 extending out of the tank top of the curing reaction tank 34.

The super-magnetic separation processing unit 4 comprises a super-magnetic separation main machine 41 and a security tank 42 which are sequentially connected through pipelines; the safety tank 42 is provided with a check valve to prevent the reverse flow of the clean water treated by the super-magnetic separation main machine.

The precise filtering unit 5 comprises a flat ceramic membrane filter 51 and a reverse osmosis membrane filter 52 which are sequentially connected through pipelines; the reverse osmosis membrane filter 52 includes a cartridge filter, a reverse osmosis device, and a scale inhibitor addition device connected in sequence through a pipe.

Example 2

The method for treating and recycling the underground coal mine slime water by adopting the underground coal mine slime water treatment and recycling system of the embodiment 1 comprises the following steps:

s1, enabling underground coal slime water of a coal mine to enter a water-sand separation unit 1, and removing large-particle-size particles with the particle size of more than 5.0mm from the slime water; the method is used for reducing the sedimentation frequency of the underground water sump and the load of a subsequent treatment unit;

s2, enabling the slime water in the step S1 to enter a pretreatment unit 2, wherein the pretreatment unit 2 comprises a multistage pre-sedimentation tank 21, a mining slurry pump 22 and a sludge pipe 23, and suspended matters in the settled slime water are smaller than 1000mg/L;

s3, enabling the coal slime water in the step S2 to enter a coagulation reaction unit 3, wherein the coagulation reaction unit 3 comprises a mixing stirring tank 31, a primary reaction tank 33 and a curing reaction tank 34 which are sequentially connected through pipelines. The coagulant feeding pump 35 is connected with the mixing and stirring tank 31, 100-500 mg/L of polyaluminium chloride (PAC) is fed into the mixing and stirring tank 31 through the coagulant feeding pump 35, and the mixing and stirring tank 31 is fully stirred by the mining stirrer 32, and then the slime water enters the primary reaction tank 33; 5-10 mg/L Polyacrylamide (PAM) is added into the first-stage reaction tank 33 by a coagulant aid feed pump 36, and 10-30mg/L magnetic seeds (Fe) are added into the first-stage reaction tank 33 by a magnetic seed feed pump 37 ₃ O ₄ ) After the primary reaction tank 33 is fully stirred by the mining stirrer 32, the slime water enters the curing reaction tank 34 through a pipeline; the curing reaction tank 34 forms magnetic alum blossom with PAC, PAM and magnetic seeds under the action of the mining stirrer 32;

s4, enabling the coal slime water in the step S3 to enter a super-magnetic separation treatment unit 4, wherein the super-magnetic separation treatment unit 4 comprises a super-magnetic separation main machine 41 and a security tank 42 which are sequentially connected through a pipeline, a check valve is arranged in the security tank 42, clear water treated by the super-magnetic separation main machine is prevented from flowing back, and suspended matters in the coal slime water after super-magnetic separation are smaller than 30mg/L;

s5, enabling the coal slime water in the step S4 to enter a precise filtering unit 5, wherein the precise filtering unit 5 comprises a flat ceramic membrane filter 51 and a reverse osmosis membrane filter 52 which are sequentially connected through pipelines, and recycling effluent; the step is to further remove the soluble solids and calcium sodium magnesium plasma in the mine water through the flat ceramic membrane filter 51 and the reverse osmosis membrane filter 52 respectively, so as to improve the water quality of the effluent recycling of the whole system.

The above embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.

Claims

1. A coal mine underground slime water treatment recycling system is characterized in that: the underground coal slime water treatment and recycling system for the coal mine comprises a water sand separation unit (1) for removing large-particle-size particles in slime water, a pretreatment unit (2) for removing suspended particles, colloidal substances and floccules in the slime water through precipitation, a coagulation reaction unit (3) for forming magnetic alum flowers by coagulating the suspended substances and the magnetic seeds in the water together by adding a magnetic seed medium and a flocculating agent, a super-magnetic separation treatment unit (4) for rapidly separating the magnetic floccules under the action of a high-intensity magnetic field generated by a permanent magnetic material, and a precise filtration unit (5) for reducing the content of soluble solid suspended substances and metal ions in the slime water through a flat ceramic membrane and reverse osmosis membrane purification filtration mode; the water sand separation unit (1), the pretreatment unit (2), the coagulation reaction unit (3), the super-magnetic separation treatment unit (4) and the precise filtration unit (5) are sequentially connected through pipelines.

2. The underground coal mine slime water treatment and recycling system according to claim 1, wherein the system comprises the following components: the water-sand separation unit (1) comprises a collecting tank (18), a filter screen (11), rake teeth (12), a traction chain (13), a guide device (14) and a driving device (16);

the filter screen (11) is arranged in the collecting tank (18), the collecting tank (18) is divided into a mud water area and a sewage area, the filter screen (11) comprises a primary filter screen (101), a high-density filter screen (102) and a filter screen collecting hopper (103), the filter screen collecting hopper (103) is connected between the primary filter screen (101) and the bottom of the high-density filter screen (102), an outlet of the filter screen collecting hopper (103) passes through the collecting tank (18) and is positioned above an ore main conveying adhesive tape (105), and a gate plate capable of being opened and closed is arranged on the filter screen collecting hopper (103);

the traction chain (13) is guided and supported by guide devices (14) at two ends and driven by a driving device (16) to circularly rotate, rake teeth (12) are distributed on the traction chain (13), and the traction chain (13) drives the rake teeth (12) to salvage sundries filtered by the primary filter screen (101).

3. The underground coal mine slime water treatment and recycling system according to claim 2, wherein the system is characterized in that: the pretreatment unit (2) comprises a multistage pre-sedimentation tank (21) and a mining slurry pump (22), the mining slurry pump (22) is arranged at the bottom of the multistage pre-sedimentation tank (21), and the mining slurry pump (22) can convey coal slime impurities precipitated in the pre-sedimentation tank (21) to a sludge collecting tank through a sludge pipe (23).

4. The underground coal mine slime water treatment and recycling system according to claim 3, wherein the system comprises the following components: a plurality of aeration pipes (223) and a plurality of sloping plates (221) are arranged in the multistage pre-sedimentation tank (21), and the sloping plates (221) are arranged in layers in the multistage pre-sedimentation tank (21); one end of the sloping plate (221) is hinged with the pool wall, the other end of the sloping plate is connected with a sloping plate traction rod (226), and the sloping plate traction rod (226) is connected with a traction motor (227) through a steel wire; balance connecting rods (220) which are in one-to-one correspondence with the inclined plates (221) are fixed in the multistage pre-sedimentation tank (21), and springs are connected between the balance connecting rods (220) and the inclined plates (221); the top of the multistage pre-sedimentation tank (21) is provided with a compressed air pump (229), and the compressed air pump (229) supplies air to an aeration pipe (223) in the tank through a compressed air pipeline (224); the aeration pipe (223) is arranged below the inclined plate (221), and the aeration pipe (223) blows compressed air to the inclined plate (221) through the aeration holes (222).

5. The underground coal mine slime water treatment and recycling system according to claim 4, wherein the system comprises the following components: the horizontal inclination angle of the inclined plate (221) is 30-55 degrees, the turnover angle range of the inclined plate (221) is 30-90 degrees, and the vertical arrangement interval of the inclined plate (221) is 40-60 cm; the aeration holes (222) on the aeration pipe (223) are round holes, the aeration holes (222) are uniformly distributed on the aeration pipe (223), the aperture of the aeration holes (222) is 10-20 mm, and the arrangement interval of the aeration holes is 5-10 cm.

6. The underground coal mine slime water treatment and recycling system according to claim 5, wherein the system is characterized in that: the coagulation reaction unit (3) comprises a mixing stirring tank (31), a primary reaction tank (33) and a curing reaction tank (34) which are sequentially connected through pipelines; a coagulant feeding pump (35) is arranged on the mixing and stirring tank (31), and a coagulant aid feeding pump (36) and a magnetic seed feeding pump (37) are arranged on the primary reaction tank (33); the mixing stirring tank (31), the primary reaction tank (33) and the curing reaction tank (34) are respectively provided with a mining stirrer (32).

7. The underground coal mine slime water treatment and recycling system according to claim 6, wherein the system is characterized in that: the super-magnetic separation processing unit (4) comprises a super-magnetic separation host (41) and a security tank (42) which are sequentially connected through pipelines.

8. The underground coal mine slime water treatment and recycling system according to claim 7, wherein the system comprises the following components: the precise filtering unit (5) comprises a flat ceramic membrane filter (51) and a reverse osmosis membrane filter (52) which are sequentially connected through pipelines; the reverse osmosis membrane filter (52) comprises a cartridge filter, a reverse osmosis device and a scale inhibitor adding device which are sequentially connected through pipelines.

9. A method for treating and recycling underground coal mine slime water by adopting the underground coal mine slime water treating and recycling system of claim 8, which is characterized in that: the method specifically comprises the following steps:

s1, enabling underground coal slime water of a coal mine to enter a water-sand separation unit (1) to remove particles with large particle diameters of more than 5.0mm in the slime water;

s2, allowing the slime water in the step S1 to enter a pretreatment unit (2) for precipitation, wherein suspended matters in the precipitated slime water are smaller than 1000mg/L;

s3, enabling the coal slime water in the step S2 to beThe mixed slurry enters a coagulation reaction unit (3), a coagulant feeding pump (36) is connected with a mixing and stirring tank (31), 100-500 mg/L of polyaluminium chloride is fed into the mixing and stirring tank (31) through the coagulant feeding pump (35), and after the mixing and stirring tank (31) is fully stirred by a mining stirrer (32), the coal slurry water enters a primary reaction tank (33); 5-10 mg/L polyacrylamide is added into the first-stage reaction tank (33) through a coagulant aid feeding pump (36), 10-30mg/L magnetic seeds are added into the first-stage reaction tank (33) through a magnetic seed feeding pump (37), and the magnetic seeds are Fe ₃ O ₄ After the primary reaction tank (33) is fully stirred by a mining stirrer (32), coal slime water enters a curing reaction tank (34); the curing reaction tank (34) forms magnetic alum blossom with polyaluminium chloride, polyacrylamide and magnetic seeds under the action of a mining stirrer (32);

s4, enabling the slime water in the step S3 to enter a super-magnetic separation treatment unit (4), wherein a safety tank (42) of the super-magnetic separation treatment unit (4) is provided with a check valve to prevent clear water treated by a super-magnetic separation main machine (41) from flowing backwards, and suspended matters in the slime water subjected to super-magnetic separation are smaller than 30mg/L;

s5, enabling the slime water in the step S4 to enter a precise filtering unit (5), and recycling the effluent.