Step-by-step softening process system for high-hardness coal mine water

Abstract

The utility model discloses a high-hardness coal mine water step-by-step softening process system, and relates to the technical field of mine water treatment. Comprising an adjusting tank, an efficient rotational flow purification dosing system, an efficient rotational flow purifier, a clarification water tank, a high-density sedimentation dosing system, a first high-density sedimentation tank, a sulfuric acid dosing device, a sodium hypochlorite dosing device, a first softening water tank, a ceramic membrane ultrafiltration device, an ultrafiltration water producing tank, a reverse osmosis dosing system, a reverse osmosis device, a fresh water tank and a reverse osmosis concentrated water tank, a second high-density sedimentation tank, a variable-porosity filter tank and a second softening water tank; the device is reasonable in structural design, short and efficient in technological process and stable in softening effect, calcium and magnesium ions can be recycled step by step, meanwhile, reverse osmosis produced water reaches the industrial and agricultural reuse water standard, and zero emission of mine water can be achieved by combining the subsequent process with the advanced treatment process.

Description

Technical Field

[0001] The utility model relates to the technical field of mine water treatment, in particular to a step-by-step softening process system for high-hardness coal mine water. Background Art

[0002] A large amount of mine water is produced during the mining process of large and medium-sized coal mines. This water often has the characteristics of large water volume, high suspended matter, high hardness, and high salt content. Mine water generally contains suspended matter mainly composed of coal dust and rock powder, and the salt content is basically 1000-4000 mg / L. The salt content of mine water in a small number of mines is more than 5000 mg / L. In addition, the total hardness and calcium hardness are also very high, generally in the range of 1000-2000 mg / L (calculated as calcium carbonate). Therefore, the direct discharge of mine water not only wastes a lot of precious water resources, but also pollutes the surrounding environment, and greatly restricts the normal production of coal mining enterprises.

[0003] Centralized treatment of mine water and reuse for coal mine production water and industrial and agricultural production water in surrounding areas can effectively alleviate the contradiction of water shortage while protecting the local environment, which is very conducive to the sustainable development of the ecological environment. Membrane technology has become a key research object in the field of zero discharge of mine water, such as Chinese patent applications with application numbers 201810723437.6, 201811306485.1, 201821967438.7, and 202121863177.6. Commonly used membrane systems require a softening pretreatment process to remove calcium and magnesium hardness in water to reduce the risk of system scaling. However, the current softening pretreatment process is basically to remove calcium and magnesium hardness simultaneously, and a large amount of flocculants, coagulants, acids and alkalis need to be added at the same time, which has a high operating cost, and the softening process is unstable, especially the softening effect of reverse osmosis concentrated water is poor. At the same time, the chemical sludge produced is difficult to realize the resource utilization of calcium and magnesium ions, and the disposal as industrial solid waste will greatly increase the operating costs of enterprises. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a high-hardness coal mine water step softening process system with a reasonable structural design, so as to realize the recovery and utilization of calcium and magnesium ions in such wastewater, and the softening effect is stable and the investment and operation cost is low.

[0005] The technical solution adopted by the utility model to solve the above problems is: a high-hardness coal mine water step softening process system, which is characterized by comprising a regulating tank, a high-efficiency cyclone purification and dosing system, a high-efficiency cyclone purifier, a clarifying water tank, a high-density precipitation and dosing system, a first high-density precipitation tank, a sulfuric acid dosing device, a sodium hypochlorite dosing device, a first softening water tank, a ceramic membrane ultrafiltration device, an ultrafiltration water production tank, a reverse osmosis dosing system, a reverse osmosis device, a fresh water tank, a reverse osmosis concentrated water tank, a second high-density precipitation tank, a variable pore filter tank and a second softening water tank;

[0006] The water outlet of the regulating tank is connected to the water inlet of the high-efficiency cyclone purifier, the outlet of the high-efficiency cyclone purification dosing system is connected to the reagent inlet of the high-efficiency cyclone purifier, the water outlet of the high-efficiency cyclone purifier is connected to the water inlet of the clarified water tank, the water outlet of the clarified water tank is connected to the water inlet of the first high-density sedimentation tank, the outlet of the high-density sedimentation dosing system is respectively connected to the reagent inlets of the first high-density sedimentation tank and the second high-density sedimentation tank, the water outlet of the first high-density sedimentation tank is connected to the water inlet of the first softening water tank, the outlets of the sulfuric acid dosing device and the sodium hypochlorite dosing device are both connected to the water outlet of the first high-density sedimentation tank, The water outlet of the first softening water tank is connected to the water inlet of the ceramic membrane ultrafiltration device, the water outlet of the ceramic membrane ultrafiltration device is connected to the water inlet of the ultrafiltration water production tank, the water outlet of the ultrafiltration water production tank and the outlet of the reverse osmosis dosing system are both connected to the water inlet of the reverse osmosis device, the water production outlet of the reverse osmosis device is connected to the water inlet of the fresh water tank, the concentrated water outlet of the reverse osmosis device is connected to the water inlet of the reverse osmosis concentrated water tank, the water outlet of the reverse osmosis concentrated water tank is connected to the water inlet of the second high-density sedimentation tank, the water outlet of the second high-density sedimentation tank is connected to the water inlet of the variable pore filter, and the water outlet of the variable pore filter is connected to the water inlet of the second softening water tank.

[0007] Furthermore, the high-efficiency cyclone purification dosing system includes a polyaluminium chloride dosing device and a coagulant dosing device, and the outlets of the polyaluminium chloride dosing device and the coagulant dosing device are both connected to the agent inlet of the high-efficiency cyclone purifier.

[0008] Furthermore, the high-density precipitation dosing system includes a sodium hydroxide dosing device, a sodium carbonate dosing device, a polyferric sulfate dosing device and a coagulant dosing device, and the outlets of the sodium hydroxide dosing device, the sodium carbonate dosing device, the polyferric sulfate dosing device and the coagulant dosing device are all connected to the reagent inlets of the first high-density precipitation tank and the second high-density precipitation tank.

[0009] Furthermore, the reverse osmosis dosing system includes a reverse osmosis antiscalant dosing device and a reverse osmosis reductant dosing device, and the outlets of the reverse osmosis antiscalant dosing device and the reverse osmosis reductant dosing device are both connected to the agent inlet of the reverse osmosis device.

[0010] Furthermore, the water outlet of the regulating tank is connected to the water inlet of the high-efficiency cyclone purifier through a raw water pump; the water outlet of the clarified water tank is connected to the water inlet of the first high-density sedimentation tank through a clarified water pump; the water outlet of the first softened water tank is connected to the water inlet of the ceramic membrane ultrafiltration device through a softened water pump; the water outlet of the ultrafiltration water production tank is connected to the water inlet of the reverse osmosis device through an ultrafiltration water production pump and a reverse osmosis high-pressure pump; the water outlet of the reverse osmosis concentrated water tank is connected to the water inlet of the second high-density sedimentation tank through a reverse osmosis concentrated water pump.

[0011] Working method: Mine water enters the regulating tank, enters the high-efficiency cyclone purifier through the raw water pump, and polyaluminium chloride and coagulant are added to the inlet mixer of the high-efficiency cyclone purifier for flocculation reaction. The clean water after high-efficiency cyclone separation enters the clarified water tank; the effluent from the clarified water tank enters the first high-density sedimentation tank through the clarified water pump for decalcification and softening treatment, and sodium hydroxide, sodium carbonate, polyferric sulfate and coagulant are added to the dosing pipe of the first high-density sedimentation tank to control the pH value at 9.2~9.5, and the effluent contains 0.5~1.0mmol / L of excess carbonate ion content. The effluent from the first high-density sedimentation tank is added with sulfuric acid and sodium hypochlorite for pH adjustment and sterilization treatment, and then enters the first softening water tank, and enters the ceramic membrane ultrafiltration device through the softening water pump for deep filtration treatment; the effluent from the ceramic membrane ultrafiltration device enters the ultrafiltration water production tank, and enters the reverse osmosis device through the ultrafiltration water production pump and the reverse osmosis high-pressure pump for desalination treatment, and the reverse osmosis device produces water and enters the fresh water tank; the concentrated water from the reverse osmosis device enters the reverse osmosis concentrated water tank, and enters the second high-density sedimentation tank through the reverse osmosis concentrated water pump for magnesium removal and softening reaction. Sodium hydroxide, sodium carbonate, polyferric sulfate and coagulant are added to the dosing pipe of the second high-density sedimentation tank to control the reaction pH value at 11.0~11.5. The effluent from the second high-density sedimentation tank is added with sulfuric acid for pH adjustment, and then enters the variable pore filter tank, and enters the second softening water tank after filtration. Finally, the high-hardness coal mine water is treated by step-by-step softening and synergistic membrane method, and the softening effect is relatively stable. Calcium and magnesium ions can be recycled step by step. At the same time, the reverse osmosis water meets the industrial and agricultural reuse water standards, and the subsequent combination with deep treatment technology can achieve zero discharge of mine water.

[0012] Furthermore, the high-efficiency cyclone purifier is based on the principle of chemical coagulation + cyclone separation to remove coal powder, colloid and other substances in mine water. The first high-density sedimentation tank is based on the principle of double alkali chemical softening precipitation. By adding NaOH, Na2CO3, polyferric sulfate, coagulant, etc., the reaction pH value is controlled to be 9.2~9.5, and the excess carbonate content in the effluent is ensured to be 0.5~1.0mmol / L, mainly to make the Ca in the water 2+The ions react chemically to form CaCO3 precipitates, with a calcium hardness removal rate of more than 95%, and help to reduce pH callback pressure and reduce acid usage. The ceramic membrane ultrafiltration device uses an inorganic α-Al2O3 ceramic membrane component with an average pore size of 30nm; the reverse osmosis device adopts a one-stage, two-stage, and inter-stage pressurization structure with a recovery rate of 70%~80%. At the same time, the membrane concentration process can greatly increase the magnesium ion concentration in the RO concentrate (about 4~5 times that of the influent), which helps to improve the magnesium ion removal rate through the coupling effect of synergistic chemical precipitation treatment. The second high-density sedimentation tank is based on the principle of double-alkali chemical softening precipitation. By adding NaOH, Na2CO3, polyferric sulfate, coagulant, etc., the reaction pH is controlled to be 11.0~11.5, which mainly increases the Mg in the water. 2+ The ions react chemically to generate Mg(OH)2 precipitation, and the magnesium hardness removal rate can reach over 95%.

[0013] Compared with the prior art, the utility model has the following advantages and effects: the utility model has a reasonable structural design, a short process flow, can realize the step-by-step softening of calcium and magnesium ions, and the softening effect is stable and reliable. The ultrafiltration device adopts an inorganic ceramic membrane component, which has better tolerance to pollutants, can operate at high flux, and has a long service life. The turbidity of the produced water is less than 0.2NTU and the SDI is less than 3. The desalination system adopts a reverse osmosis process, and the water quality of the produced water fully meets the standards for industrial and agricultural reuse water, and the subsequent combination with the deep treatment process can achieve zero discharge of mine water. In particular, the membrane concentration process is used to increase the initial concentration of magnesium ions in the water, which can provide a higher concentration condition for the subsequent chemical precipitation treatment, overcome the low efficiency of the magnesium hydroxide precipitation reaction at low concentrations, and the problem that the flocculant and coagulant aid are easily added in excess to cause the subsequent membrane system to be blocked, and ensure the synergistic effect of membrane treatment and chemical softening precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a medium- and high-hardness coal mine water step softening process system.

[0015] In the figure: regulating tank 1, raw water pump 2, polyaluminium chloride dosing device 3, coagulant dosing device 4, high-efficiency cyclone purifier 5, clarified water tank 6, clarified water pump 7, sodium hydroxide dosing device 8, sodium carbonate dosing device 9, polyferric sulfate dosing device 10, first high-density sedimentation tank 11, sulfuric acid dosing device 12, sodium hypochlorite dosing device 13, first softened water tank 14, softened water pump 15, ceramic membrane ultrafiltration device 16, ultrafiltration water production tank 17, reverse osmosis scale inhibitor dosing device 18, reverse osmosis reducing agent dosing device 19, ultrafiltration water production pump 20, reverse osmosis high-pressure pump 21, reverse osmosis device 22, fresh water tank 23, reverse osmosis concentrated water tank 24, reverse osmosis concentrated water pump 25, second high-density sedimentation tank 26, variable pore filter 27, second softened water tank 28. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0017] See also Figure 1 In this embodiment, a high-hardness coal mine water step softening process system includes a regulating tank 1, a high-efficiency cyclone purification dosing system, a high-efficiency cyclone purifier 5, a clarified water tank 6, a high-density precipitation dosing system, a first high-density precipitation tank 11, a sulfuric acid dosing device 12, a sodium hypochlorite dosing device 13, a first softened water tank 14, a ceramic membrane ultrafiltration device 16, an ultrafiltration water production tank 17, a reverse osmosis dosing system, a reverse osmosis device 22, a fresh water tank 23, a reverse osmosis concentrated water tank 24, a second high-density precipitation tank 26, a variable pore filter 27 and a second softened water tank 28;

[0018] The water outlet of the regulating tank 1 is connected to the water inlet of the high-efficiency cyclone purifier 5, the outlet of the high-efficiency cyclone purification dosing system is connected to the reagent inlet of the high-efficiency cyclone purifier 5, the water outlet of the high-efficiency cyclone purifier 5 is connected to the water inlet of the clarified water tank 6, the water outlet of the clarified water tank 6 is connected to the water inlet of the first high-density sedimentation tank 11, the outlet of the high-density sedimentation dosing system is respectively connected to the reagent inlets of the first high-density sedimentation tank 11 and the second high-density sedimentation tank 26, the water outlet of the first high-density sedimentation tank 11 is connected to the water inlet of the first softening water tank 14, the outlets of the sulfuric acid dosing device 12 and the sodium hypochlorite dosing device 13 are both connected to the water outlet of the first high-density sedimentation tank 11, and the first softening water tank The water outlet of 14 is connected to the water inlet of the ceramic membrane ultrafiltration device 16, the water outlet of the ceramic membrane ultrafiltration device 16 is connected to the water inlet of the ultrafiltration water production pool 17, the water outlet of the ultrafiltration water production pool 17 and the outlet of the reverse osmosis dosing system are both connected to the water inlet of the reverse osmosis device 22, the water production outlet of the reverse osmosis device 22 is connected to the water inlet of the fresh water pool 23, the concentrated water outlet of the reverse osmosis device 22 is connected to the water inlet of the reverse osmosis concentrated water pool 24, the water outlet of the reverse osmosis concentrated water pool 24 is connected to the water inlet of the second high-density sedimentation tank 26, the water outlet of the second high-density sedimentation tank 26 is connected to the water inlet of the variable pore filter 27, and the water outlet of the variable pore filter 27 is connected to the water inlet of the second softening water pool 28.

[0019] Specifically, the high-efficiency cyclone purification dosing system includes a polyaluminium chloride dosing device 3 and a coagulant dosing device 4 , and the outlets of the polyaluminium chloride dosing device 3 and the coagulant dosing device 4 are both connected to the agent inlet of the high-efficiency cyclone purifier 5 .

[0020] Specifically, the high-density precipitation dosing system includes a sodium hydroxide dosing device 8, a sodium carbonate dosing device 9, a polyferric sulfate dosing device 10 and a coagulant dosing device 4. The outlets of the sodium hydroxide dosing device 8, the sodium carbonate dosing device 9, the polyferric sulfate dosing device 10 and the coagulant dosing device 4 are all connected to the reagent inlets of the first high-density precipitation tank 11 and the second high-density precipitation tank 26.

[0021] Specifically, the reverse osmosis dosing system includes a reverse osmosis antiscalant dosing device 18 and a reverse osmosis reductant dosing device 19 , and the outlets of the reverse osmosis antiscalant dosing device 18 and the reverse osmosis reductant dosing device 19 are both connected to the agent inlet of the reverse osmosis device 22 .

[0022] Specifically, the water outlet of the regulating tank 1 is connected to the water inlet of the high-efficiency cyclone purifier 5 through the raw water pump 2; the water outlet of the clarified water tank 6 is connected to the water inlet of the first high-density sedimentation tank 11 through the clarified water pump 7; the water outlet of the first softened water tank 14 is connected to the water inlet of the ceramic membrane ultrafiltration device 16 through the softened water pump 15; the water outlet of the ultrafiltration water production tank 17 is connected to the water inlet of the reverse osmosis device 22 through the ultrafiltration water production pump 20 and the reverse osmosis high-pressure pump 21; the water outlet of the reverse osmosis concentrated water tank 24 is connected to the water inlet of the second high-density sedimentation tank 26 through the reverse osmosis concentrated water pump 25.

[0023] Specifically, the high-efficiency cyclone purifier 5 is based on the principle of chemical coagulation + cyclone separation to remove coal powder, colloid and other substances in the mine water. The first high-density sedimentation tank 11 is based on the principle of double-alkali chemical softening and precipitation. By adding NaOH, Na2CO3, polyferric sulfate, coagulant, etc., the reaction pH value is controlled to be 9.2~9.5, and the excess carbonate content in the effluent is ensured to be 0.5~1.0mmol / L, mainly to make the Ca in the water 2+ The ions react chemically to form CaCO3 precipitates, with a calcium hardness removal rate of more than 95%, and help to reduce pH callback pressure and reduce acid usage. The ceramic membrane ultrafiltration device 16 uses an inorganic α-Al2O3 ceramic membrane component with an average pore size of 30nm; the reverse osmosis device 22 adopts a one-stage, two-stage, and inter-stage pressurization structure, with a recovery rate of 70%~80%. At the same time, the membrane concentration process can greatly increase the magnesium ion concentration in the RO concentrate (about 4~5 times that of the influent), which helps to improve the magnesium ion removal rate through the coupling effect of synergistic chemical precipitation treatment. The second high-density sedimentation tank 26 is based on the principle of double-alkali chemical softening precipitation. By adding NaOH, Na2CO3, polyferric sulfate, coagulant, etc., the reaction pH is controlled to be 11.0~11.5, mainly to increase the Mg in the water 2+ The ions react chemically to generate Mg(OH)2 precipitation, and the magnesium hardness removal rate can reach over 95%.

[0024] Working method: Mine water enters the regulating tank 1, enters the high-efficiency cyclone purifier 5 through the raw water pump 2, polyaluminum chloride and coagulant are added to the inlet mixer of the high-efficiency cyclone purifier 5 for flocculation reaction, and the clean water after high-efficiency cyclone separation enters the clarified water tank 6; the effluent of the clarified water tank 6 enters the first high-density sedimentation tank 11 through the clarified water pump 7 for decalcification and softening treatment, and sodium hydroxide, sodium carbonate, polyferric sulfate and coagulant are added to the dosing pipe of the first high-density sedimentation tank 11 to control the pH value at 9.2~9.5, and the effluent contains 0.5~1.0mmol / L of excess carbonate. The effluent of the first high-density sedimentation tank 11 is added with sulfuric acid and sodium hypochlorite for pH adjustment and sterilization treatment, and then enters the first softening water tank 14, and enters the ceramic membrane ultrafiltration device 16 through the softening water pump 15 for deep filtration treatment; the effluent of the ceramic membrane ultrafiltration device 16 enters the ultrafiltration water production tank 17, and enters the reverse osmosis device 22 through the ultrafiltration water production pump 20 and the reverse osmosis high-pressure pump 21 for desalination treatment, and the water produced by the reverse osmosis device 22 enters the fresh water tank 23; the concentrated water of the reverse osmosis device 22 enters the reverse osmosis concentrated water tank 24, and enters the second high-density sedimentation tank 26 through the reverse osmosis concentrated water pump 25 for magnesium removal and softening reaction, and sodium hydroxide, sodium carbonate, polyferric sulfate and coagulant are added to the dosing pipe of the second high-density sedimentation tank 26 to control the reaction pH value at 11.0~11.5. The effluent of the second high-density sedimentation tank 26 is added with sulfuric acid for pH adjustment, and then enters the variable pore filter 27, and enters the second softening water tank 28 after filtration. Finally, the high-hardness coal mine water is treated by step-by-step softening and synergistic membrane method, and the softening effect is relatively stable. Calcium and magnesium ions can be recycled step by step. At the same time, the reverse osmosis water meets the industrial and agricultural reuse water standards, and the subsequent combination with deep treatment technology can achieve zero discharge of mine water.

[0025] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0026] In addition, it should be noted that the above content described in this specification is only an example of the structure of the utility model. All equivalent changes made based on the structure, features and principles described in the utility model patent are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications, supplements or replace the specific embodiments described in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A high-hardness coal mine water step softening process system, characterized in that: It comprises a regulating tank (1), a high-efficiency cyclone purification dosing system, a high-efficiency cyclone purifier (5), a clarified water tank (6), a high-density sedimentation dosing system, a first high-density sedimentation tank (11), a sulfuric acid dosing device (12), a sodium hypochlorite dosing device (13), a first softened water tank (14), a ceramic membrane ultrafiltration device (16), an ultrafiltration water production tank (17), a reverse osmosis dosing system, a reverse osmosis device (22), a fresh water tank (23), a reverse osmosis concentrated water tank (24), a second high-density sedimentation tank (26), a variable pore filter (27) and a second softened water tank (28); The water outlet of the regulating tank (1) is connected to the water inlet of the high-efficiency cyclone purifier (5); the outlet of the high-efficiency cyclone purifier dosing system is connected to the reagent inlet of the high-efficiency cyclone purifier (5); the water outlet of the high-efficiency cyclone purifier (5) is connected to the water inlet of the clarified water tank (6); the water outlet of the clarified water tank (6) is connected to the water inlet of the first high-density sedimentation tank (11); the outlet of the high-density sedimentation dosing system is respectively connected to the reagent inlets of the first high-density sedimentation tank (11) and the second high-density sedimentation tank (26); the water outlet of the first high-density sedimentation tank (11) is connected to the water inlet of the first softened water tank (14); the outlets of the sulfuric acid dosing device (12) and the sodium hypochlorite dosing device (13) are both connected to the water outlet of the first high-density sedimentation tank (11); The water outlet of the ceramic membrane ultrafiltration device (14) is connected to the water inlet of the ceramic membrane ultrafiltration device (16), the water outlet of the ceramic membrane ultrafiltration device (16) is connected to the water inlet of the ultrafiltration water production pool (17), the water outlet of the ultrafiltration water production pool (17) and the outlet of the reverse osmosis dosing system are both connected to the water inlet of the reverse osmosis device (22), the water production outlet of the reverse osmosis device (22) is connected to the water inlet of the fresh water pool (23), the concentrated water outlet of the reverse osmosis device (22) is connected to the water inlet of the reverse osmosis concentrated water pool (24), the water outlet of the reverse osmosis concentrated water pool (24) is connected to the water inlet of the second high-density sedimentation pool (26), the water outlet of the second high-density sedimentation pool (26) is connected to the water inlet of the variable pore filter pool (27), and the water outlet of the variable pore filter pool (27) is connected to the water inlet of the second softening water pool (28).

2. The high-hardness coal mine water step softening process system according to claim 1 is characterized in that: The high-efficiency cyclone purification dosing system comprises a polyaluminium chloride dosing device (3) and a coagulant dosing device (4), wherein the outlets of the polyaluminium chloride dosing device (3) and the coagulant dosing device (4) are both connected to the reagent inlet of the high-efficiency cyclone purifier (5).

3. The high-hardness coal mine water step softening process system according to claim 1 is characterized in that: The high-density precipitation dosing system comprises a sodium hydroxide dosing device (8), a sodium carbonate dosing device (9), a polyferric sulfate dosing device (10) and a coagulant dosing device (4), wherein the outlets of the sodium hydroxide dosing device (8), the sodium carbonate dosing device (9), the polyferric sulfate dosing device (10) and the coagulant dosing device (4) are all connected to the reagent inlets of the first high-density precipitation tank (11) and the second high-density precipitation tank (26).

4. The high-hardness coal mine water step softening process system according to claim 1 is characterized in that: The reverse osmosis dosing system comprises a reverse osmosis antiscalant dosing device (18) and a reverse osmosis reductant dosing device (19), wherein the outlets of the reverse osmosis antiscalant dosing device (18) and the reverse osmosis reductant dosing device (19) are both connected to the agent inlet of the reverse osmosis device (22).

5. The high-hardness coal mine water step softening process system according to claim 1 is characterized in that: The water outlet of the regulating tank (1) is connected to the water inlet of the high-efficiency cyclone purifier (5) through a raw water pump (2); the water outlet of the clarified water tank (6) is connected to the water inlet of the first high-density sedimentation tank (11) through a clarified water pump (7); the water outlet of the first softened water tank (14) is connected to the water inlet of the ceramic membrane ultrafiltration device (16) through a softened water pump (15); the water outlet of the ultrafiltration water production tank (17) is connected to the water inlet of the reverse osmosis device (22) through an ultrafiltration water production pump (20) and a reverse osmosis high-pressure pump (21); and the water outlet of the reverse osmosis concentrated water tank (24) is connected to the water inlet of the second high-density sedimentation tank (26) through a reverse osmosis concentrated water pump (25).

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