A mine multi-stage water treatment system and method

Abstract

The application discloses a kind of mine multistage water treatment system and method, belong to mine water treatment technical field, the system includes tubular flocculation unit, AFM filter material unit, silicon carbide membrane separation unit, RO reverse osmosis unit, CFRO countercurrent reverse osmosis unit, according to the different water quality of raw water, different water inlet unit is selected, mine water is multistage treated, and is hierarchically utilized, wherein flocculation and filter material water production can be used for greening dust removal water, membrane separation water production can be used for production and domestic water, limit reverse osmosis water production can be used for underground equipment and drinking water etc..The system water production of the application fully meets the water demand of various types of mine, process is simple and efficient, and the area is smaller, reduces investment and operating cost, while realizing the resource utilization of mine water.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mine water treatment, and particularly relates to a mine multistage water treatment system and method. BACKGROUND

[0002] With the advance of coal mining time and the expansion of mining scale, the amount of production equipment and domestic water will be more and more large. In the process of production and domestic water of coal mine, a large amount of coal dust, rock dust, suspended solids, mineral chemical composition, artificial pollution and microorganism are mixed into water, so that the originally good water quality water resources are polluted, resulting in high suspended solids, chemical oxygen demand, sulfide and total hardness in mine water. A large amount of mine wastewater exceeding the standard is directly discharged without treatment, which will cause water pollution, damage to groundwater system, and lead to shortage of production and domestic water of many coal mines.

[0003] Because the mining of ore deposit destroys the original occurrence state of groundwater and produces fissures, resulting in serious decline of groundwater level, at the same time, the coal enterprise constantly improves the consciousness of water quality requirement of mine area domestic water, mine equipment water and mine area environmental protection, therefore, mine water reuse is imperative, and it is particularly important to perfect and improve the configuration of related water treatment equipment.

[0004] AFM filter material is a new type of active filter material, which can be used as a direct substitute for quartz sand in any type of quartz sand filter. Its surface is chemically activated and heat treated, and has negative electricity and presents lipophilic and hydrophobic characteristics. It can adsorb impurities in the surrounding water through charge, and filter out the nutrients required for the survival of bacteria in water through charge adsorption, so that bacteria and microorganisms in water can be well removed. It has been verified that at a flow rate of 20 m / h and a material height of 1000 mm, the removal rate of 1 mu m particle size particles can reach 97%. Compared with traditional quartz sand filter material, the filtration performance can be doubled, and it also has the ability of resisting bacterial and microbial erosion and self-disinfection. Because there is no bacterial and microbial membrane attached, the backwashing water volume can be reduced by more than 50%, the filtration precision is improved, the waste of water resources is reduced, and the service life can be up to 10 years.

[0005] Silicon carbide (SiC) membrane separation technology is considered the future of filtration. Because SiC ceramic membranes are prepared using recrystallization technology, they possess high mechanical strength and good chemical stability. Furthermore, SiC material exhibits natural superhydrophilicity (contact angle of only 0.3°), far exceeding that of ceramic materials such as alumina, resulting in a membrane porosity exceeding 45%, leading to high water flux. The isoelectric point of SiC membranes is around pH=3, and the membrane surface maintains a negative charge over a wide pH range, making it difficult for dissolved organic carbon and transparent polymer particles to adhere to the membrane surface. This results in good fouling resistance and facilitates the removal of negatively charged substances from the water surface, such as bacteria, algae, MLSS, transparent polymer particles, and oils. Maintenance costs are low, making it suitable for water treatment in extreme environments. Due to its high chemical resistance, SiC membranes are robust and durable, capable of withstanding regular chemical cleaning. A variety of cleaning programs can be tailored to the characteristics of the fouling agents, and it is resistant to all oxidants, including ozone and hydroxyl radicals.

[0006] Reverse osmosis (RO) technology applies pressure to the high-concentration solution side. When the operating pressure exceeds the osmotic pressure of the solution, water is separated from the brine through the reverse osmosis membrane. It primarily separates the solvent from the solutes within the solvent's ionic range, allowing only water and solvent to pass through. This removes most suspended solids, colloids, organic matter, and salts from the water. Countercurrent reverse osmosis (RO) technology uses innovative technology and a deep understanding of scale removal and prevention to push the RO system to its operational limits. It adds a small amount of salt solution to the RO membrane outlet to maintain the brine concentration at the RO membrane feed and osmosis ends, effectively reducing the pressure difference across the membrane. Through multi-stage series treatment, the concentrate is further concentrated, achieving the goal of reducing concentrate volume. Simultaneously, due to the lower pressure difference across the membrane, the overall system energy consumption is also lower.

[0007] By combining tubular flocculation technology, AFM filter media, silicon carbide ceramic membrane separation, and multi-stage and extreme reverse osmosis technologies, multi-stage water purification and graded production water quality can be achieved. This water can be used for underground fire-fighting spray dust suppression, coal mining machines, emulsion preparation for hydraulic support equipment, surface production water, landscaping, coal washing, employee bathing, and domestic water supply. This avoids water waste, protects the mining area's ecological environment, and increases economic benefits.

[0008] CN201410729733.9 discloses a deep purification system for mine water, including a hydrocyclone desander, an aeration buffer tank, and a manganese sand filter. Traditional mine water treatment and reuse processes require large land areas, have complex equipment, high investment and operating costs, and poor treatment effects. There is an urgent need in those skilled in the art to develop a multi-stage mine water treatment system and method to meet existing application market and performance requirements. Summary of the Invention

[0009] In view of the deficiencies of the prior art, the present application provides a mine multi-stage water treatment system and method, which takes AFM filter material technology, silicon carbide membrane separation technology, multi-stage and reverse flow reverse osmosis technology as the core. The suspended solids and large particle substances in the mine water are removed through tubular flocculation and AFM filter material filtration, the water quality is clarified and purified, the pollutants such as microorganisms, particulate matter and macromolecular substances in the mine water are effectively removed through the silicon carbide membrane separation device, and the microfiltration and ultrafiltration water are realized. The reverse osmosis system is used for removing most of the soluble salts, heavy metal ions, organic matter, colloids, bacteria and viruses and other impurities in the water, realizing the deep purification of the mine water, and ensuring the high quality and high quality of the water produced by the system. The reverse flow reverse osmosis technology reduces the amount of mine concentrated water, further recovers part of the water in the concentrated water, and reduces the cost of subsequent treatment and disposal of the concentrated water.

[0010] Through the system, the mine water is purified and softened, the water quality of the system is stable, the water is used in stages, the waste of water resources is avoided, the cost of water resource utilization is reduced, the comprehensive management of the mine water is realized, and the mine water is purified and applied.

[0011] In order to achieve the above object, the present application provides a mine multi-stage water treatment system and method, which comprises a tubular flocculation device, an AFM filter device, a silicon carbide membrane separation device and a limit reverse osmosis device. The suspended solids, particulate matter, organic matter, soluble salts, heavy metal ions, bacteria and viruses in the mine water are effectively removed. The system selects different water inlet units according to the different water quality of raw water, and the mine water is treated in multiple stages. The water produced by the system fully meets the water demand of various types of mines, the process is simple and efficient, the land occupation area is small, the investment and operation cost are reduced, and the resource utilization of the mine water is realized.

[0012] A mine multi-stage water treatment system, comprising a mine multipurpose water inlet separation device and a purification device, the water inlet separation device comprising a tubular flocculation unit, an AFM filter unit and a silicon carbide membrane separation unit, wherein the tubular flocculation unit, the AFM filter unit and the silicon carbide membrane separation unit are connected in series, mine multipurpose water is introduced into the tubular flocculation unit (1), the AFM filter unit and the silicon carbide membrane separation unit respectively, and the silicon carbide membrane separation unit has a clean water outlet end; the desalination device comprises a RO reverse osmosis unit and a CFRO reverse flow reverse osmosis unit which are connected in sequence; the RO reverse osmosis unit has a clean water inlet end, a reverse osmosis concentrated water outlet end and a water outlet end, the clean water inlet end is connected to the silicon carbide membrane separation unit to extract the clean water; the CFRO reverse flow reverse osmosis unit has a concentrated water inlet end, an ultra-concentrated water side outlet end and a water outlet end, wherein the concentrated water inlet end is connected to the reverse osmosis concentrated water outlet end of the reverse osmosis unit to extract;

[0013] Further, the processing method of the mine multi-stage water treatment system comprises the following steps: firstly, the mine reused water is subjected to tubular flocculation clarification in a tubular flocculation unit, the obtained clarified water is subjected to filtration and purification in an AFM filter material tank, part of the produced water is used for ground greening, underground spray dust removal and fire prevention; another part of the produced water is subjected to further purification in an AFM filter material unit, part of the produced water is used for coal washing and domestic water, another part of the produced water is subjected to further purification and water quality softening treatment in an RO reverse osmosis unit, the produced water can be used for underground hydraulic equipment water and domestic drinking water, the reverse osmosis concentrated water is subjected to further recovery of part of the water in the concentrated water in a CFRO countercurrent reverse osmosis unit, and the concentrated water is reduced in amount.

[0014] Further, the AFM filter material unit is provided with an automatic filter material backwashing unit, the silicon carbide membrane separation unit is provided with an automatic silicon carbide membrane backwashing unit, and the RO reverse osmosis unit is provided with an automatic RO membrane backwashing unit.

[0015] Further, the tubular flocculation unit is provided with a flocculation dosing unit for automatically adding chemicals, and the reverse osmosis device is provided with a reverse osmosis membrane dosing unit for automatically adding chemicals.

[0016] Further, the system produces water in stages for greening, production, equipment and domestic water.

[0017] Further, the system further comprises a water pump lifting and conveying system and a pressurizing device.

[0018] Further, the system further comprises water quality online monitoring equipment.

[0019] Further, the system can select different water inlet separation devices according to the water quality of raw water, the tubular flocculation unit, the AFM filter material unit and the silicon carbide membrane separation unit can directly process water or be connected in series for multi-stage processing.

[0020] Further, the RO reverse osmosis unit is a one-stage reverse osmosis or a multi-stage reverse osmosis according to the water quality requirement of the produced water.

[0021] Further, the system adopts programmable microcomputer intelligent control operation.

[0022] SDI is an important index for detecting the water inlet of the reverse osmosis system, and is also a main means for testing whether the water outlet of the pretreatment system meets the water inlet requirement of the reverse osmosis.

[0023] Further, the water inlet of the RO reverse osmosis unit has an SDI of less than or equal to 5 and a pH of 2 to 11.

[0024] Further, the desalination rate of the reverse osmosis membrane of the RO reverse osmosis unit is greater than or equal to 98%, the operating pressure is less than or equal to 1.5 MPa, and the water recovery rate is greater than or equal to 65%.

[0025] Further, the CFRO reverse osmosis unit recovers 50% of the water from the reverse osmosis concentrated water, and the water recovery rates of the RO reverse osmosis unit and the CFRO reverse osmosis unit are both greater than or equal to 85%.

[0026] The AFM filter material can remove 97% of particles with a particle size of 1 mu m at a flow rate of 20 m / h and a filter material height of 1000 mm, and has a service life of 10 years.

[0027] Further, the separation precision of the silicon carbide membrane of the silicon carbide membrane separation unit is progressive pulse, the average pore size is 0.01-1 mu m, the structure of the silicon carbide membrane can be a tubular membrane or a plate type membrane, the filtration mode can be selected as dead-end filtration or cross-flow filtration, and the average size of the membrane pore size is preferably 0.5 mu m, 0.1 mu m and 0.04 mu m, and the filtration pressure is 0.6-1 MPa.

[0028] Further, the cleaning mode of the membrane separation device can be in-situ cleaning, hydraulic and pneumatic backwashing.

[0029] Further, the water treatment system is used for multi-stage treatment of mine water, but is not limited thereto, and can be used in the textile, energy and power industries.

[0030] The present application has the following beneficial effects:

[0031] 1. The present application uses a new type of modified filter material, and the filtration performance is doubled compared with the traditional quartz sand filter material, the filter material has high surface negative charge and biological resistance, and does not allow bacteria and other microorganisms to grow on the surface, which can reduce the average water consumption of backwashing by 50%.

[0032] 2. The silicon carbide membrane has high mechanical strength and porosity, resulting in high water flux, chemical stability, resistance to washing, long service life of more than 8 years.

[0033] 3. The reverse osmosis technology can increase the water recovery rate, reduce the amount of concentrated water, greatly reduce the treatment cost of concentrated water, and further realize zero discharge of wastewater.

[0034] 4. The treatment system has advanced process, high water treatment efficiency and precision, stable product water quality, simple equipment, compact structure, high integration degree, convenient operation, small occupied area, low operation and maintenance cost, long service life of equipment, and the core filter material can be replaced for 10 years.

[0035] 5. The present application can be widely used in mine water resource utilization, and has good application prospect and economic value. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1This is a simplified process flow diagram of the multi-stage mine water treatment system described in this invention. Figure 1 In the middle, 1-tubular flocculation unit, 2-AFM filter media unit, 3-silicon carbide membrane separation unit, 4-RO reverse osmosis unit, 5-CFRO countercurrent reverse osmosis unit, 6-flocculation dosing unit, 7-filter media backwashing unit, 8-silicon carbide membrane backwashing unit, 9-desalination device backwashing unit, 10-reverse osmosis membrane dosing unit. Detailed Implementation Example 1

[0037] Multi-stage water treatment system in mines, such as Figure 1 As shown, the system includes an influent separation device and a purification device. The influent separation device includes a tubular flocculation unit 1, an AFM filter media unit 2, and a silicon carbide membrane separation unit 3, which are connected in series. Mine reclaimed water is introduced into each of these units. The silicon carbide membrane separation unit 3 has a purified water outlet. The desalination device includes an RO reverse osmosis unit 4 and a CFRO countercurrent reverse osmosis unit 5 connected in sequence. The RO reverse osmosis unit 4 has a purified water influent, a reverse osmosis concentrate outlet, and a product water outlet. The silicon carbide membrane separation unit 3 has a purified water outlet for extraction; the CFRO countercurrent reverse osmosis unit 5 has a concentrate inlet, an ultra-concentrated water outlet, and a product water outlet, wherein the concentrate inlet is extracted from the reverse osmosis concentrate outlet of the reverse osmosis unit 4; the AFM filter media unit 2 is equipped with an automatic filter media backwashing unit 7, the silicon carbide membrane separation unit 3 is equipped with an automatic silicon carbide membrane backwashing unit 8, and the RO reverse osmosis unit 4 is equipped with an automatic RO membrane backwashing unit 9; the tubular flocculation unit 1 is equipped with an automatic dosing flocculation dosing unit 6, and the RO reverse osmosis unit 4 is equipped with an automatic dosing reverse osmosis membrane dosing unit 10.

[0038] The mine reuse water raw water enters the tubular flocculation unit 1 and the AFM filter material unit 2 for AFM filter material filtration to remove suspended solids and large particle substances in the mine water, achieve water quality clarification and purification, and effectively remove pollutants such as microorganisms, particulate matter and macromolecular substances in the mine water through the silicon carbide membrane separation device, to achieve microfiltration and ultrafiltration water production. The reverse osmosis system is used to remove most of the soluble salts, heavy metal ions, organic matter, colloids, bacteria and viruses and other impurities in the water, to achieve deep purification of the mine water, and the countercurrent reverse osmosis technology is used to reduce the amount of the mine concentrated water, further recover part of the water in the concentrated water, and reduce the cost of subsequent treatment and disposal of the concentrated water. The mine reuse water is first subjected to tubular flocculation clarification in the tubular flocculation unit, the obtained clarified water enters the AFM filter material tank for filtration and purification, part of the water production is used for ground greening, underground spray dusting and fire prevention, another part of the water production enters the AFM filter material unit for further purification, part of the water production is used for coal washing and domestic water, another part of the water production enters the RO reverse osmosis unit for further purification and water quality softening treatment, the water production can be used for underground hydraulic equipment water and domestic drinking water, and the reverse osmosis concentrated water enters the CFRO countercurrent reverse osmosis unit for further recovery of part of the water in the concentrated water, to reduce the amount of the concentrated water.

[0039] When 100 t / h of mine wastewater is treated, the water quality has a turbidity of 36.4 NTU, a total dissolved solids content of 1827 mg / L, a total hardness of 899 mg / L, a large amount of visible suspended solids, and excessive bacterial count and total coliform count. Through the use of the silicon carbide membrane separation process, the water quality has a turbidity of ≤0.5 NTU, is clear and transparent, the bacterial count is qualified, the calcium and magnesium ion concentration is ≤1 ppm, the water production rate can reach 90 t / h, and the water production rate is 90%. The water quality of the reverse osmosis and countercurrent reverse osmosis has a turbidity of ≤0.01 NTU, a total dissolved solids content of 1827 mg / L, a total hardness of 56 mg / L, an electrical conductivity of ≤10 μs / cm, the pure water production rate is 75 t / h, and the water recovery rate is 80%. Example 2

[0040] The mine multi-stage water treatment system is as follows Figure 1As shown, the system comprises a raw water separation device and a purification device, wherein the raw water separation device comprises a tubular flocculation unit 1, an AFM filter material unit 2, and a silicon carbide membrane separation unit 3, the tubular flocculation unit 1, the AFM filter material unit 2, and the silicon carbide membrane separation unit 3 are connected in series, mine reuse water is introduced into the tubular flocculation unit 1, the AFM filter material unit 2, and the silicon carbide membrane separation unit 3, and the silicon carbide membrane separation unit 3 has a clean water outlet end; wherein the desalination device comprises a RO reverse osmosis unit 4 and a CFRO countercurrent reverse osmosis unit 5 which are sequentially connected; the RO reverse osmosis unit 4 has a clean water inlet end, a reverse osmosis concentrated water outlet end, and a water production outlet end, and the clean water inlet end is connected to the silicon carbide membrane separation unit 3 to extract clean water; wherein the CFRO countercurrent reverse osmosis unit 5 has a concentrated water inlet end, an ultra-concentrated water side outlet end, and a water production outlet end, wherein the concentrated water inlet end is connected to the reverse osmosis concentrated water outlet end of the reverse osmosis unit 4 to extract concentrated water;

[0041] The raw mine reuse water enters the tubular flocculation unit 1 for tubular flocculation and the AFM filter material unit 2 for AFM filter material filtration to remove suspended solids and large particles in the mine water, achieve water quality clarification and purification, effectively remove pollutants such as microorganisms, particulate matter, and macromolecular substances in the mine water through the silicon carbide membrane separation device, and achieve microfiltration and ultrafiltration water production. The reverse osmosis system is used to remove most of the soluble salts, heavy metal ions, organic matter, colloids, bacteria, viruses, and other impurities in the water, achieve deep purification of the mine water, the countercurrent reverse osmosis technology reduces the amount of mine concentrated water, recovers part of the water in the concentrated water, and reduces the cost of subsequent treatment and disposal of the concentrated water. The mine reuse water is first subjected to tubular flocculation clarification in the tubular flocculation unit, the obtained clarified water enters the AFM filter material tank for filtration and purification, part of the water production is used for ground greening and underground spray dusting and fire prevention; another part of the water production enters the AFM filter material unit for further purification, part of the water production is used for coal washing and domestic water, another part of the water production enters the RO reverse osmosis unit for further purification and water quality softening treatment, the water production can be used for underground hydraulic equipment water and domestic drinking water, the reverse osmosis concentrated water enters the CFRO countercurrent reverse osmosis unit for further recovery of part of the water in the concentrated water, and the amount of the concentrated water is reduced. The RO reverse osmosis unit is a secondary reverse osmosis unit according to the water quality requirements of the water production. The system adopts programmable microcomputer intelligent control operation.

[0042] The water quality of the RO reverse osmosis unit is SDI≤5, pH 2, the system further comprises a water pump lifting conveying system and a pressurizing device, the system further comprises an online water quality monitoring device, the pollution density index SDI of the ultrafiltration water is determined by the method in ASTM D4189-07; the desalination rate of the MTRO8040TW reverse osmosis membrane is 99.2%, the operating pressure is 1.5 MPa, and the water recovery rate is 70%. The CFRO countercurrent reverse osmosis unit recovers 50% of the water based on the reverse osmosis concentrated water, the water recovery rates of the RO reverse osmosis unit and the CFRO countercurrent reverse osmosis unit are both equal to 87%; the dijie external diameter is 40 mm, the channel is 37 holes, the channel diameter is 4 mm, the membrane tube length is 1200, the average pore size is 1000 nm, the plate type silicon carbide membrane is dijie, the filtration pressure is 0.6 MPa, and the AFM filter material is AFM-0. The separation precision of the silicon carbide membrane of the silicon carbide membrane separation unit is a progressive pulse, and the filtration mode is dead-end filtration. Example 3

[0043] The mine multi-stage water treatment system is the same as that in Embodiment 2. The mine reuse water raw water enters the tubular flocculation unit 1, the tubular flocculation and AFM filter material unit 2 for AFM filter material filtration to remove suspended solids and large particle substances in the mine water, achieve water quality clarification and purification, and effectively remove microorganisms, particulate matter, macromolecular substances and other pollutants in the mine water through the silicon carbide membrane separation device, to achieve microfiltration and ultrafiltration water production. The reverse osmosis system is used to remove most of the soluble salts, heavy metal ions, organic matter, colloids, bacteria and viruses and other impurities in the water, to achieve deep purification of the mine water, and the countercurrent reverse osmosis technology is used to reduce the amount of the mine concentrated water, further recover part of the water in the concentrated water, and reduce the cost of subsequent treatment and disposal of the concentrated water. The mine reuse water is first subjected to tubular flocculation clarification in the tubular flocculation unit, and the obtained clarified water enters the AFM filter material tank for filtration and purification. Part of the water production is used for ground greening, underground spray dusting and fire prevention. Another part of the water production enters the AFM filter material unit for further purification. Part of the water production is used for coal washing and domestic water production. Another part of the water production enters the RO reverse osmosis unit for further purification and water quality softening treatment. The water production can be used for underground hydraulic equipment water and domestic drinking water. The water quality SDI3, pH 11 of the water entering the RO reverse osmosis unit. The system further comprises a water pump lifting and conveying system and a pressurizing device. The system further comprises an online water quality monitoring device. The pollution density index SDI of the ultrafiltration water production is determined by the method in ASTM D4189-07. The concentrated water of the reverse osmosis enters the CFRO countercurrent reverse osmosis unit, to further recover part of the water in the concentrated water and reduce the amount of the concentrated water. Further, the RO reverse osmosis unit is a primary reverse osmosis unit. The system is intelligently controlled and operated by a programmable microcomputer. The desalination rate of the MTRO8040TW reverse osmosis membrane is 98%, the operating pressure is 1 MPa, and the water recovery rate is 65%. The CFRO countercurrent reverse osmosis unit recovers 50% of the water based on the reverse osmosis concentrated water. The water recovery rate of the RO reverse osmosis unit and the CFRO countercurrent reverse osmosis unit is 85%. The Puchuang S-S-R-10-48-4 high-purity silicon carbide cross-flow tubular membrane has a ceramic membrane length of 1020 mm, 48 channels, a channel diameter of 4 mm, an average pore size of 0.01 μm, and a filtration pressure of 1 MPa. The separation precision of the silicon carbide membrane of the silicon carbide membrane separation unit is a progressive pulse, and the filtration mode is cross-flow filtration.

Claims

1. A multi-stage water treatment system for mines, characterized in that, The device includes an influent separation unit and a desalination unit. The influent separation unit includes a tubular flocculation unit (1), an AFM filter media unit (2), and a silicon carbide membrane separation unit (3). The tubular flocculation unit (1), the AFM filter media unit (2), and the silicon carbide membrane separation unit (3) are connected in series. Mine reclaimed water is introduced and connected to the tubular flocculation unit (1), the AFM filter media unit (2), and the silicon carbide membrane separation unit (3) respectively. The silicon carbide membrane separation unit (3) has a purified water outlet. The desalination unit includes an RO reverse osmosis unit (4) and a CFRO countercurrent reverse osmosis unit (5) connected in sequence. The RO reverse osmosis unit (4) has a purified water inlet, a reverse osmosis concentrate outlet, and a product water outlet. The purified water inlet is introduced into the purified water outlet of the silicon carbide membrane separation unit (3) for extraction. The CFRO countercurrent reverse osmosis unit (5) has a concentrate inlet, an ultra-concentrated water outlet, and a product water outlet. The concentrate inlet is introduced into the reverse osmosis concentrate outlet of the reverse osmosis unit (4) for extraction. The system can select different inlet water separation devices according to the raw water quality. The tubular flocculation unit (1), AFM filter media unit (2), and silicon carbide membrane separation unit (3) can all be directly treated or connected in series for multi-stage treatment. The treatment method of the multi-stage water treatment system in the mine includes: firstly, the mine reclaimed water is subjected to tubular flocculation clarification in the tubular flocculation unit (1), and the clarified water enters the AFM filter media unit (2) for filtration and purification. Part of the produced water enters the AFM filter media unit (2) for further purification, and part of the produced water enters the RO reverse osmosis unit (4) for further purification and water softening treatment. The produced water can be used for water for underground hydraulic equipment and domestic drinking water. The reverse osmosis concentrate enters the CFRO countercurrent reverse osmosis unit (5) for further recovery of some water in the concentrate and reduction of the concentrate volume. The AFM filter media is a chemically activated filter medium based on aluminosilicate zeolite and clinoptilolite.

2. The multi-stage mine water treatment system as described in claim 1, characterized in that, The AFM filter unit (2) is equipped with an automatic filter backwashing unit (7), the silicon carbide membrane separation unit (3) is equipped with an automatic silicon carbide membrane backwashing unit (8), and the RO reverse osmosis unit (4) is equipped with an automatic RO membrane backwashing unit (9).

3. The multi-stage mine water treatment system as described in claim 1, characterized in that, The tubular flocculation unit (1) is equipped with an automatic dosing flocculation dosing unit (6), and the RO reverse osmosis unit (4) is equipped with an automatic dosing reverse osmosis membrane dosing unit (10).

4. The multi-stage mine water treatment system as described in claim 1, characterized in that, The system also includes a water pump lifting and conveying system and a pressurization device, and the system also includes online water quality monitoring equipment.

5. The multi-stage mine water treatment system as described in claim 1, characterized in that, The separation accuracy of the silicon carbide membrane in the silicon carbide membrane separation unit (3) is progressive pulse, with an average pore size of 0.01~1μm.

6. The multi-stage mine water treatment system as described in claim 1, characterized in that, The RO reverse osmosis unit (4) is a single-stage reverse osmosis or a multi-stage reverse osmosis according to the requirements of the product water quality. The feed water quality of the RO reverse osmosis unit (4) is SDI≤5, pH2~11, and the desalination rate of a single reverse osmosis membrane of the RO reverse osmosis unit (4) is ≥98%, and the water recovery rate is ≥65%.

7. The multi-stage mine water treatment system as described in claim 1, characterized in that, The system is operated using programmable microcomputer intelligent control.

8. The multi-stage mine water treatment system as described in claim 1, characterized in that, The CFRO countercurrent reverse osmosis unit (5) recovers 50% of the water based on the reverse osmosis concentrate. The water recovery rates of both the RO reverse osmosis unit (4) and the CFRO countercurrent reverse osmosis unit (5) are greater than or equal to 85%.

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