Method and system for full-cycle control of chemical blockage of deep reinjection hypersalinity mine water

Abstract

The invention provides a method and a system for full-cycle control of chemical blockage of deep reinjection hypersalinity mine water, and the method comprises the following steps: step 1, collecting and detecting a water sample, and monitoring basic indexes of the environment; 2, carrying out a simulation test to determine the water quality of reinjection water; step 3, screening three filter materials for removing iron ions and manganese ions in the reinjection water, and determining an optimal ratio; 4, determining main chemical substances of reinjection blockage through indoor tests; 5, selecting an acid agent, and calculating the dosage to accurately remove chemical precipitates; according to the method, starting from the complete period of deep reinjection of the high-salinity mine water, after three root causes of chemical blockage caused by deep reinjection of the high-salinity mine water are fully revealed, a method for controlling the water quality before reinjection, treating the reinjection water in the front section and rapidly removing the chemical blockage in the reinjection is provided; and the risk of chemical blockage during reinjection is controlled to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of mine water, relates to deep storage and utilization of mine water, and specifically relates to a full-cycle control chemical plugging method and system for deep reinjection of high-mineralization mine water. Background Art

[0002] The western region is a rich area of ​​coal resources in my country, and it is also an arid and semi-arid climate water shortage area. Coal resources account for 70% of the total coal in the country, while water resources account for only 3% of the total. Mine water has become an important resource for protecting the ecological, production and living water in the mining area. However, with the extension of coal mining to deep or lower coal groups, changes in hydrogeological conditions, high-intensity coal mining activities and water-rock interaction, the mineralization of mine water has increased, and the total dissolved solids (TDS) concentration of mine water is greater than 1000mg / L (exceeding the Class III limit of 1000mg / L in the "Sanitary Standards for Drinking Water" and "Groundwater Quality Standards"). Highly mineralized mine water tastes bitter and cannot be drunk directly; if highly mineralized mine water is discharged directly without treatment, it will cause soil salinization; if highly mineralized mine water is directly irrigated, it will cause plants to lose water and wither and die, destroying the ecological environment. Therefore, it is very necessary to treat and utilize highly mineralized mine water in the western region.

[0003] High-mineralized well water needs to be concentrated and other deep treatments before comprehensive utilization. Deep treatment faces many problems such as large treatment scale, high treatment cost and difficulty in disposing of concentrated brine. Reinjecting high-mineralized mine water to a depth of less than 1000m through drilling and storing it in deep aquifers can not only reduce treatment costs, but also play an important role in replenishing groundwater resources and promoting deep water circulation. Therefore, deep reinjection provides a new concept and idea for the storage and utilization of high-mineralized mine water.

[0004] During the reinjection process of high-mineralized mine water, chemical blockage is prone to occur due to the influence of factors such as the water quality of the original mine water, the rock properties of the aquifer, and the temperature and pressure of the deep rock formation. The reasons for chemical blockage include the following three aspects: First, after the high-mineralized mine water enters the deep aquifer, the quality of the high-mineralized mine water is quite different from that of the aquifer. The mismatch of the two water qualities produces new chemical precipitation due to mixing; second, the high-mineralized mine water in the west has a high content of iron and manganese. During the reinjection process into the deep aquifer, the deep pH is higher than that of the mine water. Under the high pH state, iron and manganese are mainly Fe 3+ and Mn 2+The oxidative-reduction reaction generates new iron hydroxide and manganese hydroxide precipitates, which reduces the permeability of rock pores. Third, after the high-mineralization mine water enters the deep aquifer, the temperature and pressure increase, the original hydrogeochemical balance is broken, the solubility of CO2 decreases, and the CO3 in the aquifer 2- The concentration increases, thereby increasing the probability of CaCO3 precipitation. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method and system for controlling chemical blockage in the whole cycle of deep reinjection of high-mineralization mine water, so as to solve the technical problems in the prior art of chemical blockage caused by the mismatch between the reinjection water quality and the water quality of the target aquifer, the easy generation of iron hydroxide and manganese hydroxide precipitation by the iron and manganese elements in the reinjection water, and the increase of calcium ion and magnesium ion precipitation in the deep high temperature and high pressure environment.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A method for controlling chemical blockage in the whole cycle of deep-seated reinjection of high-mineralization mine water, the method comprising the following steps:

[0008] Step 1: Collection and testing of water samples and monitoring of basic environmental indicators:

[0009] Collection and testing of high-mineralized mine water samples to be reinjected and water samples from target reinjection aquifers, as well as basic indicator monitoring of the target reinjection aquifer environment.

[0010] The basic indicators of the target reinjection aquifer environment include temperature and pH.

[0011] Step 2: Conduct simulation tests to determine the quality of reinjection water:

[0012] According to the basic indicators of the target reinjection aquifer environment obtained in step one, a numerical model for the reinjection test of high-mineralized mine water is constructed to simulate the test when the high-mineralized mine water samples to be reinjected are mixed with the target reinjection aquifer water samples in different proportions.

[0013] According to the operation of the experimental numerical model, the amount of chemical precipitation under different mixing ratios is quantitatively calculated, and based on the principle of minimum chemical precipitation, a linear superposition model of the proposed reinjection high-mineralization mine water sample and the target reinjection aquifer water sample is constructed to ultimately determine the water quality of the reinjection water.

[0014] Step 3: Screen three filter media for removing iron and manganese ions from reinjection water and determine the best ratio:

[0015] Determine the concentrations of iron and manganese ions in the reinjection water whose water quality has been determined in step 2, set up a filtration test for iron and manganese ions before reinjection, preliminarily select three filter media with strong adsorption capacity for iron and manganese ions, and determine the optimal mixing ratio of the three filter media.

[0016] Step 4: Indoor test to determine the main chemical substances causing the reinjection blockage:

[0017] First, the three filter materials in step three are used to treat the iron ions and manganese ions in the reinjection water to obtain treated reinjection water.

[0018] Secondly, before reinjection, the treated reinjection water is subjected to a simulation test of the interaction between the reinjection water and the target rock indoors, and the chemical substances that cause blockage are identified in the rock after the simulation test.

[0019] Finally, the treated reinjection water is reinjected.

[0020] Step 5: Select the acid and calculate the dosage to accurately remove chemical precipitation:

[0021] The type of acid agent that matches the chemical substance that causes the blockage identified in step 4 is selected, and the amount of the acid agent is finally determined based on the concentration of the acid agent and the length and radius of the return pipe diameter during actual use.

[0022] The present invention also has the following technical features:

[0023] Specifically, in step one, the water samples of the high-mineralization mine water to be reinjected are water samples collected from different locations underground, including the roof sprinkling point, the drainage drilling point and the central water tank.

[0024] The collection of water samples from the target reinjection aquifer is carried out during drilling.

[0025] The high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample are filtered and treated, and the K in the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample are respectively detected by inductively coupled ion chromatograph. + 、Na + , Ca 2+ Mg 2+ 、SO4 2- and Cl - The concentration of HCO3 in the high-mineralized mine water samples to be reinjected and the target aquifer water samples was determined by chemical method. - concentration.

[0026] Preferably, in step 2, determining the water quality of the reinjection water specifically includes the following steps:

[0027] Step 201, using the Interactive module in the PHREEQC numerical simulation software, conduct a simulation test with the ratio of the proposed reinjection high-mineralization mine water sample to the target reinjection aquifer water sample being (1-9):(1-9), and input the average concentration of the proposed reinjection high-mineralization mine water sample and the concentration of different ions in the target reinjection aquifer water sample in each test.

[0028] The average concentration of different ions is obtained by calculating the average value of the different ion concentrations collected and detected in step one.

[0029] The temperature and pH set in the Interactive module are parameters monitored by the target reinjection aquifer environment in step one.

[0030] Step 202, according to the simulation test in step 201, obtain the mixing results of more than or equal to 8 groups of high-mineralization mine water samples to be reinjected and target reinjection aquifer water samples in different proportions, that is, obtain the chemical precipitation amounts of more than or equal to 8 groups of different substances.

[0031] In step 203, the chemical precipitation amounts of each group in step 202 are summed up respectively to obtain the sum of the chemical precipitation amounts in each group of experiments. According to the principle of minimum chemical precipitation amount, the mixing ratio of a group of high-mineralized mine water samples to be reinjected with the minimum chemical precipitation amount and the target reinjection aquifer water sample is taken as the optimal reinjection ratio.

[0032] The mixed water of the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample under the optimal reinjection ratio is the reinjection water.

[0033] Step 204, according to the optimal reinjection ratio in step 203, by constructing a linear superposition model, calculate the K + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - and HCO3 - The linear superposition model of the concentrations of the seven ions is:

[0034] C 回注 =K1×C 矿井水 +K2×C 地下水

[0035] Where:

[0036] C 回注 is the concentration of a certain ion in the reinjection water, in mg / L;

[0037] K1 is the proportion of the high-mineralization mine water sample to be reinjected in the optimal reinjection ratio obtained in the mixing test;

[0038] K2 is the proportion of the target reinjection aquifer water sample in the optimal reinjection ratio obtained in the mixing test;

[0039] C 矿井水 To study the K content of high mineralization mine water samples to be injected + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - or HCO3 - The average concentration of, in mg / L;

[0040] C 地下水 K in the aquifer water sample for target reinjection + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - or HCO3 - Concentration, in mg / L.

[0041] Preferably, in step three, the optimal mixing ratio of the three filter materials is coconut shell biochar: black sand: fly ash ceramsite = 80wt.%: 10wt.%: 10wt.%.

[0042] Preferably, in step five, when the chemical substance is calcium carbonate or magnesium carbonate, the acid agent is dilute hydrochloric acid.

[0043] When the chemical substance is calcium sulfate or magnesium sulfate, the acid agent is hydrofluoric acid.

[0044] The present invention also protects a full-cycle controlled chemical plugging system for deep-layer reinjection of high-mineralization mine water, which is used to implement the full-cycle controlled chemical plugging method for deep-layer reinjection of high-mineralization mine water as described above.

[0045] The system includes an intelligent mixing control device for reinjection water quality, an iron-manganese multi-media stratified filtration tank, and an acid injection device for precise flow control.

[0046] The reinjection water quality intelligent mixing control device is used to execute step two.

[0047] The iron-manganese multi-media layered filtration tank is used to perform step three.

[0048] The acid injection device with precise flow control is used to perform step five.

[0049] Specifically, the system also includes a water tank, a water pump is arranged inside the water tank, the water pump is connected to one end of a first water pipe, the other end of the first water pipe is connected to the mine water inlet of the reinjection water quality intelligent mixing control device, and a mixing tank drain outlet is also arranged at the bottom of the reinjection water quality intelligent mixing control device, the mixing tank drain outlet is connected to one end of a second water pipe, and the other end of the second water pipe is connected to the water storage tank.

[0050] The water storage tank is also provided with a water storage tank outlet, which is connected to the third water pipe. The third water pipe is provided with a third water pipe branch port, which is respectively connected to one end of the first branch of the third water pipe and one end of the second branch of the third water pipe.

[0051] The first water pipe is also provided with a first water pipe branch port, and the first water pipe branch port is connected to the other end of the first branch of the third water pipe.

[0052] The other end of the second branch of the third water delivery pipe is connected to the reinjection water inlet in the iron-manganese multi-media layered filter tank.

[0053] The iron-manganese multi-media layered filtration pool is also provided with a clean water outlet, which is connected to one end of a fourth water pipe, and the other end of the fourth water pipe is connected to an underground deep well.

[0054] A second acid injection pipe is also provided inside the deep well, and the second acid injection pipe is connected to the acid liquid output port in the acid injection device for accurately controlling the flow rate.

[0055] Specifically, the intelligent mixing control device for reinjection water quality comprises a mixing tank, wherein the interior of the mixing tank is an outer chamber, and the outer chamber is surrounded by a cylinder with an open top to form a mixing chamber with an open top.

[0056] A first mine water inlet pipe and a first groundwater inlet pipe are arranged on the inner side wall of the mixing chamber; a plurality of nozzles are evenly arranged on the first mine water inlet pipe and the first groundwater inlet pipe respectively.

[0057] The top of the first mine water inlet pipe is open, the bottom of the first mine water inlet pipe is connected to the mine water pipe branch port on the second mine water inlet pipe, one end of the second mine water inlet pipe is connected to the mine water inlet outside the bottom of the mixing tank, and the other end of the second mine water inlet pipe is connected to the bottom of the mixing chamber.

[0058] The top of the first groundwater inlet pipe is open, the bottom of the first groundwater inlet pipe is connected to one end of the second groundwater inlet pipe, and the other end of the second groundwater inlet pipe is connected to the groundwater inlet outside the bottom of the mixing tank.

[0059] The second groundwater inlet pipe is also provided with a groundwater inlet pipe branch, and the groundwater inlet pipe branch is connected with the bottom of the mixing chamber.

[0060] The channel formed by the mine water inlet, the second mine water inlet pipe, the mine water pipe branch port, the first mine water inlet pipe and the mixing chamber is the mine water inlet channel; the channel formed by the mine water inlet, the second mine water inlet pipe and the mixing chamber is also the mine water inlet channel.

[0061] The channel formed by the groundwater inlet, the second groundwater inlet pipe, the first groundwater inlet pipe and the mixing chamber is a groundwater inlet channel; the channel formed by the groundwater inlet, the second groundwater inlet pipe, the groundwater inlet pipe branch and the mixing chamber is also a groundwater inlet channel.

[0062] A mixing tank drain outlet is also provided at the bottom of the mixing tank, a first gap is provided between the top of the outer bin and the top of the mixing chamber, a second gap is provided between the inner wall of the mixing tank and the outer wall of the mixing chamber, and a channel connected by the first gap, the second gap and the mixing tank drain outlet is a drainage channel.

[0063] Specifically, the iron-manganese multi-media layered filter pool includes a first reinjection water pipe arranged horizontally, reinjection water inlets are arranged at both axial ends of the first reinjection water pipe, and the first reinjection water pipe is evenly arranged with a plurality of reinjection water pipe branch openings opening downward along the axial direction, and the plurality of reinjection water pipe branch openings are connected one-to-one with the tops of a plurality of second reinjection water pipes in the vertical direction, and the bottoms of the plurality of second reinjection water pipes are used to inject water into the coarse sand filter layer, a multi-media filter layer is laid at the bottom of the coarse sand filter layer, a bottom infiltration layer is laid at the bottom of the multi-media filter layer, and a clean water outlet is arranged at the bottom of the bottom infiltration layer.

[0064] A first backwash pipe in the horizontal direction is arranged at the bottom of the multi-media filter layer, backwash water inlets are arranged at both radial ends of the first backwash pipe, and a plurality of backwash pipe branch ports opening upward are evenly arranged along the radial direction of the first backwash pipe, and the plurality of backwash pipe branch ports are connected one by one with a plurality of second backwash pipes in the vertical direction.

[0065] Specifically, the acid injection device with precise flow control includes an acid liquid storage bottle, a bottom of which is provided with an acid liquid outlet, the acid liquid outlet is connected to one end of a first acid injection pipe, the other end of the first acid injection pipe is connected to the top of a second acid injection pipe, and the lower half of the second acid injection pipe is located in a water filter pipe in a deep well.

[0066] The bottom of the second acid injection pipe is connected to the top of the acid injection pump, and a small hole is also arranged on the part of the second acid injection pipe located in the water filter pipe.

[0067] Compared with the prior art, the present invention has the following technical effects:

[0068] (I) The present invention starts from the whole cycle of deep reinjection of high-mineralization mine water, and after fully revealing the three fundamental reasons causing chemical blockage caused by deep reinjection of high-mineralization mine water, proposes methods for water quality control before reinjection, front-end treatment of reinjection water, and rapid removal of chemical blockage during reinjection, thereby maximally controlling the risk of chemical blockage during reinjection.

[0069] (II) The method of the present invention can be directly extended to the high-mineralization deep-layer reinjection site, solving the problem of reduced reinjection efficiency and reduced reinjection water volume due to chemical blockage during the reinjection process, strengthening the deep storage and circulation of high-mineralization mine water, and ultimately solving the problem of large-scale and high-cost surface treatment of high-mineralization mine water.

[0070] (III) The system for controlling chemical blockages in the whole cycle during deep reinjection of high-mineralization mine water of the present invention adopts an intelligent hybrid control device for reinjection water quality to control water quality before reinjection, an iron-manganese multi-media stratified filtration tank to remove iron ions and manganese ions, and an acid injection device with precise flow control to efficiently remove chemical blockages in a high-temperature and high-pressure environment, thereby ultimately solving the problem of chemical blockages that are prone to occur during reinjection of high-mineralization mine water. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1(a) shows the relationship between the adsorption of iron ions and manganese ions by coconut shell biochar and time.

[0072] Figure 1(b) is a graph showing the relationship between the adsorption of iron ions and manganese ions by fly ash ceramsite and time.

[0073] Figure 1(c) is a graph showing the relationship between the adsorption of iron ions and manganese ions by black sand and time.

[0074] Figure 2 Schematic diagram of indoor water-rock interaction simulation test.

[0075] Figure 3 This is a scanning electron microscope image of chemical blocking materials in the target rock.

[0076] Figure 4 This is a schematic diagram of the structure of the deep layer reinjection system of high mineralization mine water.

[0077] FIG5( a ) is a schematic diagram of the structure of the intelligent mixing control device for reinjection water quality.

[0078] FIG. 5( b ) is a schematic diagram of the structure of the AA section in FIG. 5( a ) viewed from above.

[0079] Fig. 5(c) Schematic diagram of the panel of the water quality detector.

[0080] Figure 6 This is a schematic diagram of the structure of the iron-manganese multi-media layered filtration tank.

[0081] Figure 7 Schematic diagram of the structure of the acid injection device for precise flow control.

[0082] The meanings of the numbers in the figure are: 1-intelligent mixing control device for reinjection water quality, 2-iron-manganese multi-media layered filtration tank, 3-acid injection device for precise flow control, 4-water tank, 5-water storage tank, 6-deep well.

[0083] 101-mine water inlet, 102-mixing tank drain outlet, 103-second water delivery pipe, 104-mixing tank, 105-external bin, 106-mixing chamber, 107-first mine water inlet pipe, 108-first groundwater inlet pipe, 109-second mine water inlet pipe, 110-second groundwater inlet pipe, 111-groundwater inlet, 112-mine water inlet channel, 113-groundwater inlet channel, 114-mixer, 115-water quality detection probe, 116-first gap, 117-second gap, 118-drainage channel, 119-nozzle.

[0084] 201-reinjection water inlet, 202-clean water outlet, 203-fourth water pipe, 204-first reinjection water pipeline, 205-reinjection water pipeline branch, 206-second reinjection water pipeline, 207-coarse sand filter layer, 208-multi-media filter layer, 209-bottom percolation layer, 210-iron and manganese concentration monitor, 211-first backwash pipeline, 212-backwash water inlet, 213-backwash pipeline branch, 214-second backwash pipeline.

[0085] 301 - acid liquid outlet, 302 - acid liquid storage bottle, 303 - first acid injection pipe, 304 - acid injection pump.

[0086] 401 - water pump, 402 - first water pipe.

[0087] 501 - water outlet of water storage tank, 502 - third water pipe.

[0088] 601-the second acid injection pipe, 602-the water filter pipe.

[0089] 10401- stirring controller, 10402- water quality detector, 10403- pressure meter, 10404- air release valve.

[0090] 10901- mine water pipe branch, 10902- mine water regulating valve, 10903- mine water flow meter.

[0091] 11001-groundwater inlet pipe branch, 11002-groundwater regulating valve, 11003-groundwater flow meter.

[0092] 30301-Acid injection flow control and monitor, 30302-Valve.

[0093] 40201-The first water pipe branch.

[0094] 50201-branch outlet of the third water pipe, 50202-first branch of the third water pipe, 50203-second branch of the third water pipe.

[0095] 60101-Small hole.

[0096] 5020301-Water pipe controller.

[0097] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0098] It should be noted that, unless otherwise specified, all components, software, modules, instruments and materials in the present invention are components, software, modules, instruments and materials known in the prior art. For example, the inductively coupled ion chromatograph is a known inductively coupled ion chromatograph; the online physical and chemical index monitoring probe is a known online physical and chemical index monitoring probe;

[0099] PHREEQC numerical simulation software is the known PHREEQC numerical simulation software; Interactive module is the known Interactive module.

[0100] The overall technical concept of the present invention is that the high-mineralized mine water in the western mining area not only contains a variety of soluble conventional ions, but also has a high concentration of iron ions and manganese ions. When it is reinjected from the shallow to the deep layer, the high-mineralized mine water will interact with the deep aquifer and form a new hydrogeochemical balance. Not only will new carbonate, sulfate and other salt precipitations be generated, but also iron and manganese oxides and hydroxide precipitations will be generated, blocking the chemical pores of the rock, and ultimately reducing the mine water reinjection capacity.

[0101] Before designing the deep reinjection system of mine water, it is considered that there are three reasons for chemical blockage in deep reinjection of high-mineralized mine water: ① The quality of reinjection water does not match the quality of deep groundwater, and precipitation is generated due to mixing; ② The content of iron ions and manganese ions in reinjection water is high, and oxidation reactions occur during the reinjection process to generate chemical precipitation containing iron and / or manganese; ③ The deep environmental temperature and pressure increase, and the concentration of carbonate in the water increases, which is easy to combine with cations in the reinjection water to generate calcium carbonate precipitation. According to the causes of chemical blockage, the present invention provides a full-cycle chemical blockage control method and system for water quality control before reinjection, removal of iron and manganese elements at the front end, and timely removal of precipitation during reinjection, which will greatly reduce the probability of chemical precipitation before and during the reinjection of high-mineralized mine water.

[0102] It should be noted that the principle of minimum chemical precipitation amount in the present invention is to select a sample with the minimum chemical precipitation amount.

[0103] The groundwater in the present invention refers to the water in the target aquifer for reinjection.

[0104] In the present invention, high-mineralization mine water refers to mine water with a salt content higher than 1000 mg / L.

[0105] In the present invention, pH refers to acidity or alkalinity.

[0106] In the present invention, TDS refers to total dissolved solids.

[0107] In the present invention, the chemical method is used to determine HCO3 - The concentration is the commonly used chemical method to determine HCO3 - concentration.

[0108] In the present invention, Xiaobaodang No. 1 Coal Mine is located in the southwest of Shenmu City, Yulin City, Shaanxi Province, and is administratively under the jurisdiction of Dabaodang Town, Shenmu City, Yulin City. The mining area is located at the northern end of the Loess Plateau in northern Shaanxi and the southeastern edge of the Maowusu Desert. Most of the area is covered by Quaternary aeolian semi-fixed sand dunes and fixed sand dunes, dominated by wind erosion and aeolian desert hilly landforms, and the general trend of the terrain is high in the southwest and low in the east. The main aquifers in the mine are divided into the Quaternary Upper Pleistocene Salawusu Formation pore water aquifer, weathered rock bedrock fissure confined water aquifer, Jurassic Middle Anding Formation bedrock fissure confined water aquifer, Jurassic Middle Zhiluo Formation bedrock fissure confined water aquifer, and Jurassic Middle Yan'an Formation bedrock fissure confined water aquifer. The main source of mine water is the Yan'an Formation confined water aquifer.

[0109] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0110] Embodiment 1:

[0111] This embodiment provides a method for controlling chemical blockage in the whole cycle of deep-seated reinjection of high-mineralization mine water, which comprises the following steps:

[0112] Step 1: Collection and testing of water samples and monitoring of basic environmental indicators:

[0113] The collection and testing of high-mineralized mine water samples to be reinjected and the target reinjection aquifer water samples, as well as the monitoring of basic indicators of the target reinjection aquifer environment, the basic indicators of the target reinjection aquifer environment including temperature and pH, are carried out on-site by relying on online physical and chemical indicator monitoring probes lowered into the borehole.

[0114] The water samples of high-mineralization mine water to be reinjected are collected from different locations underground, including the roof sprinkling point, drainage drilling point and central water tank; the collection of target reinjection aquifer water samples is carried out during drilling; after the high-mineralization mine water samples to be reinjected are collected from underground or the target reinjection aquifer water samples are collected through drilling, the physical and chemical indicators pH, temperature and TDS of the water samples are tested on site using a portable multi-functional detector; the pH of the target reinjection aquifer water sample was measured to be 8.22 and the temperature was 60℃.

[0115] Table 1 Water quality analysis of high-mineralized mine water samples to be reinjected

[0116]

[0117] The samples of high-mineralized mine water to be reinjected and the samples of target aquifer to be reinjected were filtered and treated, and then the K in the samples of high-mineralized mine water to be reinjected and the samples of target aquifer to be reinjected were detected by inductively coupled ion chromatography in the laboratory. + 、Na + , Ca 2+ Mg 2+ 、SO4 2- and Cl - The concentration of HCO3 in the two water samples was determined by chemical method. - The water quality analysis table of the high-mineralization mine water samples to be reinjected is shown in Table 1, and the water quality analysis table of the target aquifer water samples to be reinjected is shown in Table 2.

[0118] Table 2 Water quality analysis of target reinjection aquifer water samples

[0119]

[0120] Step 2: Conduct simulation tests to determine the quality of reinjection water:

[0121] According to the basic indicators of the target reinjection aquifer environment obtained in step one, a numerical model for the reinjection test of high-mineralized mine water is constructed to simulate the test when the high-mineralized mine water samples to be reinjected are mixed with the target reinjection aquifer water samples in different proportions.

[0122] According to the operation of the experimental numerical model, the amount of chemical precipitation under different mixing ratios is quantitatively calculated, and based on the principle of minimum chemical precipitation, a linear superposition model of the proposed reinjection high-mineralization mine water sample and the target reinjection aquifer water sample is constructed to ultimately determine the water quality of the reinjection water.

[0123] Step 2 specifically includes the following steps:

[0124] Step 201, using the Interactive module in the PHREEQC numerical simulation software, conduct simulation tests with the ratios of the proposed high-mineralization mine water sample to the target reinjection aquifer water sample being 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8 and 1:9, respectively. In each test, the average concentration of the proposed high-mineralization mine water sample and the concentrations of different ions in the target reinjection aquifer water sample are input.

[0125] The average concentration of different ions is obtained by calculating the average value of the different ion concentrations collected and detected in step one.

[0126] The temperature and pH set in the Interactive module are the parameters monitored in the target reinjection aquifer environment in step 1, that is, pH 8.24 and temperature 65 °C.

[0127] In step 201, further, the simulation program related to the simulation test is as follows:

[0128] DATABASE C:\Program Files(x86)\USGS\Phreeqc Interactive\phreeqc.dat

[0129] SOLUTION 1

[0130] temp 65

[0131] pH 8.24

[0132] 4

[0133] redox pe

[0134] units mg / kgw

[0135] density 1

[0136] Na 534.6

[0137] Ca 19.22

[0138] Mg 1.33

[0139] S(6)44.62

[0140] Cl 228.97

[0141] Alkalinity 990.14

[0142] water 1#kg

[0143] SOLUTION 2

[0144] temp 60

[0145] pH 8.21

[0146] 4

[0147] redox pe

[0148] units mg / kgw

[0149] density 1

[0150] Na 7850.15

[0151] Ca 14511.02

[0152] Mg 894.06

[0153] S(6)2075.01

[0154] Cl 39739.84

[0155] Alkalinity 25.22

[0156] water 1#kg

[0157] MIX 1 1 0.1

[0159] 2 0.9.

[0160] Step 202, according to the simulation test in step 201, obtain the mixing results of 9 groups of high-mineralization mine water samples to be reinjected and the target reinjection aquifer water samples in different proportions, that is, obtain 9 groups of chemical precipitation amounts of different substances, including 1 group of chemical precipitation of four types: calcium carbonate precipitation, magnesium carbonate precipitation, calcium sulfate precipitation and magnesium sulfate precipitation.

[0161] Table 3 Chemical precipitation amount under different mixing ratios of two water samples

[0162]

[0163] Step 203, sum the 9 groups of chemical precipitation amounts in step 202 respectively to obtain the sum of the chemical precipitation amounts in each group of experiments. The calculation results are shown in Table 3. According to the principle of minimum chemical precipitation amount, it can be analyzed that when the ratio of the high-mineralization mine water sample to be reinjected to the target reinjection aquifer water sample is 9:1, the minimum total amount of chemical precipitation is 0.001580 mol / Kg. Therefore, the optimal reinjection ratio is when the ratio of the high-mineralization mine water sample to be reinjected to the target reinjection aquifer water sample is 9:1.

[0164] The mixed water of the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample under the optimal reinjection ratio is the reinjection water.

[0165] Step 204, according to the optimal reinjection ratio in step 203, by constructing a linear superposition model, calculate the K + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - and HCO3 - The linear superposition model of the concentrations of the seven ions is:

[0166] C 回注 =K1×C 矿井水 +K2×C 地下水

[0167] Where:

[0168] C 回注 is the concentration of a certain ion in the reinjection water, in mg / L;

[0169] K1 is the proportion of the high-mineralization mine water sample to be reinjected in the optimal reinjection ratio obtained in the mixing test;

[0170] K2 is the proportion of the target reinjection aquifer water sample in the optimal reinjection ratio obtained in the mixing test;

[0171] C 矿井水 To study the K content of high mineralization mine water samples to be injected + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - or HCO3 - The average concentration of, in mg / L;

[0172] C 地下水 K in the aquifer water sample for target reinjection + 、Na + , Ca 2+Mg 2+ 、SO4 2- , Cl - or HCO3 - Concentration, in mg / L.

[0173] The relevant results of the concentrations of seven ions in the reinjection water obtained according to the formula are shown in Table 4.

[0174] Table 4 Water quality analysis of high-mineralized mine water samples to be reinjected, target reinjection aquifer water samples and reinjection water

[0175]

[0176] According to Table 4, the water quality parameters of the reinjection water can be finally obtained: K + and Na + The sum of the concentrations is 1266.16 mg / L, Ca 2+ The concentration is 1468.4mg / L, Mg 2+ The concentration is 90.60mg / L, SO4 2- The concentration is 247.66 mg / L, Cl - The concentration is 4180.06mg / L, HCO3 - The concentration was 893.65 mg / L, the TDS was 8164.74 mg / L and the pH was 8.24.

[0177] Step 3: Screen three filter media for removing iron and manganese ions from reinjection water and determine the best ratio:

[0178] Determine the concentrations of iron and manganese ions in the reinjection water whose water quality has been determined in step 2, set up a filtration test for iron and manganese ions before reinjection, preliminarily select three filter media with strong adsorption capacity for iron and manganese ions, and determine the optimal mixing ratio of the three filter media.

[0179] Furthermore, in step three, the optimal mixing ratio of the three filter materials is coconut shell biochar: black sand: fly ash ceramsite = 80wt.%: 10wt.%: 10wt.%.

[0180] In step 3, the specific process of determining the optimal ratio is as follows:

[0181] Step 301, determine the iron ion concentration of 8.98 mg / L and the manganese ion concentration of 0.15 mg / L in the reinjection water whose water quality has been determined in step 2, and select a filter material that meets the four conditions of easy acquisition, good permeability, strong adsorption capacity for iron ions and manganese ions, and the concentration of iron ions and manganese ions dissolved and released in pure water is much lower than the concentration of iron ions and manganese ions in highly mineralized mine water.

[0182] In this embodiment, eight filter materials in three categories were initially selected, including soil around the mining area, waste recycling preparation materials, and activated carbon adsorption materials. The specific filter materials are shown in Table 5.

[0183] Table 5 Alternative filter media sources

[0184]

[0185] The indoor iron and manganese ion release test and adsorption test were used to determine the concentration of iron and manganese ions released by the eight filter materials in the blank state and the removal rate of iron and manganese ions. The analysis results are shown in Table 6. The test results show that the concentrations of iron and manganese ions released by the eight materials in the blank state are much lower than those of the high-mineralization mine water samples to be reinjected, but the removal rates of iron and manganese ions show differences.

[0186] Table 6 Concentrations of iron and manganese ions released by different filter media and removal rates of iron and manganese ions

[0187]

[0188] In general, the activated carbon filter media has a higher removal rate for iron and manganese ions, but among the three activated carbon filter media, coconut shell biochar has the highest removal rate, followed by fly ash ceramsite and loess, which also have much higher removal rates than fine sand and black sand. Therefore, coconut shell biochar, fly ash ceramsite, loess and black sand were initially selected as filter media.

[0189] Table 7 Permeability coefficients of eight filter media

[0190]

[0191] The permeability coefficients of these eight filter materials were determined by indoor tests. The permeability coefficients of each filter material are shown in Table 7.

[0192] Combined with the preliminary screening results of iron and manganese ion removal rates, the permeability coefficients of four media, coconut shell biochar, fly ash ceramsite, loess and black sand, were compared. The permeability coefficient of loess is on the order of 10 -5 The permeability coefficient of black sand is on the order of 10 -3 . If the permeability coefficient is too small, it is easy to cause blockage during the infiltration process. Considering that the permeability coefficients of the other two media, coconut shell biochar and fly ash ceramsite, are both small, and the removal rates of iron ions and manganese ions are high. Therefore, considering the key factors related to the release concentration, removal rate and permeability coefficient of the material for iron ions and manganese ions in the blank state, coconut shell activated carbon, fly ash ceramsite and black sand soil were finally determined as filter materials.

[0193] Step 302, using the filter material selected in step 301 as the medium material, respectively, conduct indoor oscillation adsorption tests, that is, mix 5g of the filter material with 50ml of reinjection water, and oscillate for 5min, 10min, 30min, 120min and 180min respectively. After the oscillation is completed, filter the supernatant to detect the concentration of iron ions and manganese ions in the supernatant, and calculate the adsorption amount of iron ions and manganese ions by the filter material at different times according to the concentration difference. The calculation formula of the adsorption amount is as follows:

[0194]

[0195] Where:

[0196] q t is the adsorption amount at time t, in mg / kg;

[0197] C t is the mass of iron ions or manganese ions in the supernatant at time t, in mg;

[0198] C0 is the initial mass of iron or manganese ions in the supernatant, in mg;

[0199] m is the mass of the filter material, in kg.

[0200] Since the filter material will undergo a reverse process of desorption after adsorbing iron ions and manganese ions, only the adsorption amount when the adsorption reaches equilibrium is the stable adsorption amount of the filter material. Therefore, the adsorption amount of coconut shell biochar, fly ash ceramsite and black sand soil for iron ions and manganese ions over time were tested respectively, and the results are shown in Figure 1 (a), Figure 1 (b) and Figure 1 (c). According to the stable adsorption amount determined by the three figures in Figure 1 (a), Figure 1 (b) and Figure 1 (c), a prediction model for the relationship between the stable adsorption amount and the maximum adsorption amount is constructed, and the maximum adsorption amount of a single medium is calculated. The prediction model for the relationship between the stable adsorption amount and the maximum adsorption amount is as follows:

[0201]

[0202] Where:

[0203] q t It is the maximum adsorption capacity, the unit is mg / kg.

[0204] q e It is the stable adsorption capacity, the unit is mg / kg.

[0205] e is a numerical constant, the base of the natural logarithm function, and is 2.718.

[0206] n1 is the pseudo-first-order adsorption reaction rate constant. Different filter materials have fixed adsorption reaction rate constants.

[0207] t is time, unit is min.

[0208] Finally, it was calculated that the maximum adsorption capacity of coconut shell biochar for iron ions and manganese ions were 92.41 mg / kg and 85.84 mg / kg respectively; the maximum adsorption capacity of fly ash expanded clay for iron ions and manganese ions were 11.78 mg / kg and 10.53 mg / kg respectively; the maximum adsorption capacity of black sand for iron ions and manganese ions were 72.97 mg / kg and 34.92 mg / kg respectively.

[0209] Step 303, the maximum adsorption capacity of the single medium for iron ions and manganese ions determined in step 302 is arranged in order from large to small, namely coconut shell biochar, black sand soil and fly ash ceramsite, so coconut shell biochar is determined as the main adsorption material, black sand soil is the first auxiliary adsorption material and fly ash ceramsite is the second auxiliary adsorption material.

[0210] Then, according to the ratios of main adsorption material: first auxiliary adsorption material: second auxiliary adsorption material of 8:1:1, 7:2:1, 6:3:1, 5:4:1 and 4:5:1, the superimposed adsorption amount of iron ions and manganese ions when the three filter materials are mixed in different proportions is calculated. When mixed, the superimposed adsorption amount of iron ions and manganese ions is calculated as follows:

[0211] q 混 =X1q 铁e *X 铁e +X3q 铁e +X1 锰e *X 锰e +X3q 锰e

[0212] Where:

[0213] q 混 It is the combined adsorption capacity of iron ions and manganese ions by the three filter materials when mixed, in mg / kg.

[0214] q 铁e When the adsorption is stable, the adsorption amount of iron ions by the filter material is expressed in mg / kg.

[0215] q 锰e When the adsorption is stable, the adsorption amount of manganese ions by the filter material is expressed in mg / kg.

[0216] X1, X2 and X3 are respectively the proportions of the main adsorbent material, the first auxiliary adsorbent material and the second auxiliary adsorbent material when mixed.

[0217] The results of the superimposed adsorption of iron and manganese ions when the three filter materials are mixed in different proportions are shown in Table 8. According to the superimposed adsorption of the filter materials calculated at different proportions, when the mass ratio of coconut shell biochar, black sand soil and fly ash ceramsite is 8:1:1, it is the best mixing ratio of the three filter materials. At this time, the adsorption of iron and manganese ions in the reinjection water by the filter material reaches the maximum, which is 155.62 mg / kg. Therefore, it is finally determined that the mass fractions of coconut shell biochar, black sand soil and fly ash ceramsite in the iron-manganese multi-media stratified filter pool are 80%, 10% and 10% respectively.

[0218] Table 8 Superimposed adsorption of iron ions and manganese ions by three filter materials in different proportions

[0219]

[0220] Step 4: Indoor test to determine the main chemical substances causing the reinjection blockage:

[0221] First, the three filter materials in step three are used to treat the iron ions and manganese ions in the reinjection water to obtain treated reinjection water.

[0222] Secondly, before reinjection, the treated reinjection water is subjected to a simulation test of the interaction between the reinjection water and the target rock indoors. The chemical substances that cause blockage are identified by means of scanning electron microscopy, energy spectrometer and mineral composition analysis on the rocks after the simulation test.

[0223] Finally, the treated reinjection water is reinjected.

[0224] In this embodiment, the target rock is a rock sample taken from the target reinjection aquifer during the drilling stage.

[0225] Specifically, in this embodiment, 500 ml of reinjection water and 500 g of target rock are placed in a beaker, and then different types of rocks from the target rock are added to the beaker, and the target rock and different types of rocks are mixed in a ratio of 10:1 by mass in the beaker, and the mixture is placed in the beaker to simulate the water-rock interaction process. The water-rock indoor simulation diagram is shown in FIG. Figure 2 As shown. Take 10ml of water sample from the stationary beaker every day to monitor the change of water quality. When the water quality remains stable, the test is stopped. Take out the target rock sample, crush it with a crusher, sieve it with a sieve, and analyze the mineral composition of the rock with an X-ray diffractometer, namely XRD. The specific analysis results are shown in Table 9.

[0226] Table 9 Main minerals in target rocks

[0227] Mineral Type quartz Potassium feldspar Sodium feldspar dolomite Calcite Proportion(%) 59.9 9.6 3.76 14.37 12.37

[0228] In addition, the target rock samples were cut into thin sections and tested using a scanning electron microscope. The test results are as follows: Figure 3At the same time, the energy spectrum analysis is performed on the location of pore blockage in the target rock to obtain the ratio of each element of the blocking substance. Finally, according to the ratio of different elements in the energy spectrum, the chemical composition of the blockage is judged and verified with the analysis results of the mineral composition. Finally, the type of chemical blockage substance is determined. From the test results, it can be seen that the chemical blockage substance is CaCO3.

[0229] Step 5: Select the acid and calculate the dosage to accurately remove chemical precipitation:

[0230] The type of acid agent that matches the chemical substance that causes the blockage identified in step 4 is selected, and the amount of the acid agent is finally determined based on the concentration of the acid agent and the length and radius of the return pipe diameter during actual use.

[0231] In this embodiment, the chemical clogging substance determined in step 4 is calcium carbonate, so 10wt.% dilute hydrochloric acid is selected as the reaction acid to remove the chemical clogging substance. The injection amount of acid is calculated based on the length and cross-sectional area of ​​the filter pipe. The cross-sectional area of ​​the filter pipe for on-site reinjection is 0.025m 2 , the length of the filter pipe is 15m, so the storage capacity in the filter pipe is calculated to be 0.0.375m 3 , based on the required diluted hydrochloric acid concentration of 10wt.%, the mass of concentrated hydrochloric acid with a concentration of 36wt.% that needs to be prepared can be calculated.

[0232] Embodiment 2:

[0233] This embodiment provides a system for controlling chemical plugging during the whole cycle of deep-layer reinjection of high-mineralization mine water. The system is used to execute the method for controlling chemical plugging during the whole cycle of deep-layer reinjection of high-mineralization mine water provided in Example 1.

[0234] The system includes an intelligent mixing control device for reinjection water quality 1, an iron-manganese multi-media layered filtration tank 2, and an acid injection device 3 for precise flow control, wherein:

[0235] The intelligent mixing control device 1 for reinjection water quality is used to execute step two.

[0236] The iron-manganese multi-media layered filter tank 2 is used to perform step three.

[0237] The acid injection device 3 with precise flow control is used to perform step five.

[0238] As a preferred solution of this embodiment, Figure 4As shown, the system also includes a water tank 4, a water pump 401 is arranged inside the water tank 4, and the water pump 401 is connected to one end of a first water pipe 402, and is characterized in that the other end of the first water pipe 402 is connected to the mine water inlet 101 of the reinjection water quality intelligent mixing control device 1, and a mixing tank drain 102 is also arranged at the bottom of the reinjection water quality intelligent mixing control device 1, and the mixing tank drain 102 is connected to one end of a second water pipe 103, and the other end of the second water pipe 103 is connected to the water storage tank 5.

[0239] The water storage tank 5 is also provided with a water storage tank outlet 501, which is connected to the third water pipe 502. The third water pipe 502 is provided with a third water pipe branch port 50201, which is respectively connected to one end of the third water pipe first branch 50202 and one end of the third water pipe second branch 50203.

[0240] The first water pipe 402 is also provided with a first water pipe branch port 40201 , which is connected to the other end of the first branch 50202 of the third water pipe.

[0241] The other end of the second branch 50203 of the third water pipe is connected to the reinjection water inlet 201 in the iron-manganese multi-media layered filter pool 2; a water pipe controller 5020301 is provided on the second branch 50203 of the third water pipe, and the water pipe controller 5020301 is located between the third water pipe branch port 50201 and the reinjection water inlet 201.

[0242] A clean water outlet 202 is also provided in the iron-manganese multi-media layered filter pool 2. The clean water outlet 202 is connected to one end of a fourth water pipe 203. The other end of the fourth water pipe 203 is connected to an underground deep well 6.

[0243] A second acid injection pipe 601 is also provided inside the deep well 6 , and the second acid injection pipe 601 is connected to the acid liquid outlet 301 in the acid injection device 3 for accurately controlling the flow rate.

[0244] As a preferred solution of this embodiment, as shown in Figures 5(a) and 5(b), the intelligent mixing control device 1 for reinjection water quality includes a mixing tank 104, an outer chamber 105 is inside the mixing tank 104, and an open-top mixing chamber 106 is formed in the outer chamber 105 by a cylinder with an open top.

[0245] A first mine water inlet pipe 107 and a first groundwater inlet pipe 108 are arranged on the inner side wall of the mixing chamber 106 ; a plurality of nozzles 119 are evenly arranged on the first mine water inlet pipe 107 and the first groundwater inlet pipe 108 .

[0246] The top of the first mine water inlet pipe 107 is open, the bottom of the first mine water inlet pipe 107 is connected to the mine water pipe branch port 10901 on the second mine water inlet pipe 109, one end of the second mine water inlet pipe 109 is connected to the mine water inlet 101 outside the bottom of the mixing tank 104, and the other end of the second mine water inlet pipe 109 is connected to the bottom of the mixing chamber 106.

[0247] The top of the first groundwater inlet pipe 108 is open, the bottom of the first groundwater inlet pipe 108 is connected to one end of the second groundwater inlet pipe 110, and the other end of the second groundwater inlet pipe 110 is connected to the groundwater inlet 111 outside the bottom of the mixing tank 104.

[0248] The second groundwater inlet pipe 110 is also provided with a groundwater inlet pipe branch 11001 , and the groundwater inlet pipe branch 11001 is connected to the bottom of the mixing chamber 106 .

[0249] The channel formed by the mine water inlet 101, the second mine water inlet pipe 109, the mine water pipe branch port 10901, the first mine water inlet pipe 107 and the mixing chamber 106 is the mine water inlet channel 112; the channel formed by the mine water inlet 101, the second mine water inlet pipe 109 and the mixing chamber 106 is also the mine water inlet channel 112.

[0250] The channel formed by the groundwater inlet 111, the second groundwater inlet pipe 110, the first groundwater inlet pipe 108 and the mixing chamber 106 is the groundwater inlet channel 113; the channel formed by the groundwater inlet 111, the second groundwater inlet pipe 110, the groundwater inlet pipe branch 11001 and the mixing chamber 106 is also the groundwater inlet channel 113.

[0251] A stirrer 114 is disposed inside the mixing chamber 106, and water quality detection probes 115 are disposed at the bottom of the stirrer 114 and on the inner wall of the bottom of the mixing tank 104, respectively. A stirring controller 10401 and a water quality detector 10402 are also disposed on the outer wall of the mixing tank 104. The water quality detector 10402 adopts a known water quality detector, and its panel is shown in FIG5(c).

[0252] A pressure gauge 10403 and a relief valve 10404 are also provided on the top of the mixing tank 104, and the pressure gauge 10403 and the relief valve 10404 are connected; when the pressure gauge 10403 detects that the pressure in the mixing chamber 106 is too high, the relief valve 10404 opens and starts to release pressure to eliminate safety hazards.

[0253] A mixing tank drain outlet 102 is also provided at the bottom of the mixing tank 104, a first gap 116 is provided between the top of the outer bin 105 and the top of the mixing chamber 106, a second gap 117 is provided between the inner wall of the mixing tank 104 and the outer wall of the mixing chamber 106, and a channel connected by the first gap 116, the second gap 117 and the mixing tank drain outlet 102 is a drainage channel 118.

[0254] The second mine water inlet pipe 109 is provided with a mine water regulating valve 10902 and a mine water flow meter 10903 in sequence between the mine water inlet 101 and the bottom of the mixing tank 104, and the second groundwater inlet pipe 110 is provided with a groundwater regulating valve 11002 and a groundwater flow meter 11003 in sequence between the groundwater inlet 111 and the bottom of the mixing tank 104. The combination of the mine water regulating valve 10902 and the mine water flow meter 10903 and the groundwater regulating valve 11002 and the groundwater flow meter 11003 can strictly control the ratio of mine water to groundwater. After the mine water and the groundwater enter the mixing tank 104, they are mixed inside the mixing chamber 106 while being fully stirred by the agitator 114.

[0255] As a preferred solution of this embodiment, Figure 6 As shown, the iron-manganese multi-media layered filter pool 2 includes a first reinjection water pipe 204 arranged horizontally, and reinjection water inlets 201 are arranged at both axial ends of the first reinjection water pipe 204. The first reinjection water pipe 204 is evenly provided with a plurality of reinjection water pipe branch openings 205 opening downward along the axial direction. The plurality of reinjection water pipe branch openings 205 are connected to the tops of a plurality of second reinjection water pipes 206 in a vertical direction in a one-to-one correspondence, and the bottoms of the plurality of second reinjection water pipes 206 are coarse sand filter layers 20 7 water injection, a multi-media filter layer 208 is laid at the bottom of the coarse sand filter layer 207, a bottom infiltration layer 209 is laid at the bottom of the multi-media filter layer 208, and a clean water outlet 202 is arranged at the bottom of the bottom infiltration layer 209; the second reinjection water pipeline 206 is evenly arranged at the upper end of the iron-manganese multi-media layered filter pool 2, and the reinjection water is first filtered by the coarse sand filter layer 207 after entering, which, on the one hand, achieves the purpose of uniform infiltration of the reinjection water, and on the other hand, can remove fine suspended matter in the reinjection water.

[0256] An iron and manganese concentration monitor 210 is provided at the bottom of the multi-media filter layer 208; after the iron and manganese multi-media layered filter pool 2 has been running for a period of time, the adsorption of iron ions and manganese ions by the filter material will gradually decrease, and at this time, the concentration of iron ions and manganese ions at the purified water outlet 202 will gradually increase; when the iron ion concentration is greater than 0.3 mg / L or the manganese ion concentration is greater than 0.1 mg / L, it exceeds the limit of reinjection water, and the filter material in the multi-media filter layer 208 should be replaced in time.

[0257] A first backwash pipe 211 in the horizontal direction is arranged at the bottom of the multi-media filter layer 208, and backwash water inlets 212 are arranged at both radial ends of the first backwash pipe 211. The first backwash pipe 211 is evenly provided with a plurality of backwash pipe branch ports 213 opening upward in the radial direction, and the plurality of backwash pipe branch ports 213 are connected to a plurality of second backwash pipes 214 in the vertical direction in a one-to-one correspondence. After filtering for a period of time, the filter material contains iron and manganese oxides or hydroxides, which clogs the pores of the multi-media filter layer 208. At this time, pure water is introduced from the backwash water inlet 212 to backwash the filter material to improve the removal efficiency of iron ions and manganese ions.

[0258] When the iron-manganese multi-media layered filter pool 2 is in use, the filter material is loaded into the multi-layer filter layer 208 after the proportion is determined according to the method in Example 1. First, the reinjection water enters evenly through the reinjection water inlet 201 of the iron-manganese multi-media layered filter pool 2, and then passes through the coarse sand filter layer 207, the multi-media filter layer 208 and the bottom infiltration layer 209 in turn. Finally, the reinjection water after the manganese ions and iron ions are adsorbed is discharged from the clean water outlet 202.

[0259] As a preferred solution of this embodiment, Figure 7 As shown, the acid injection device 3 for accurately controlling the flow rate includes an acid liquid storage bottle 302, and an acid liquid output port 301 is arranged at the bottom of the acid liquid storage bottle 302, the acid liquid output port 301 is connected to one end of a first acid injection pipe 303, and the other end of the first acid injection pipe 303 is connected to the top of a second acid injection pipe 601, and the lower half of the second acid injection pipe 601 is located in a water filter pipe 602 in the deep well 6.

[0260] The first acid injection pipe 303 is provided with an acid injection flow control and monitor 30301 and a valve 30302. The acid injection flow control and monitor 30301 is used to monitor the flow of the acid injected into the deep well 6.

[0261] The bottom of the second acid injection pipe 601 is connected to the top of the acid injection pump 304, and the part of the second acid injection pipe 601 located in the filter pipe 602 is also provided with a small hole 60101. The acid injection pump 304 is used to inject the acid solution back into the deep well 6. The setting of the small hole 60101 can prevent the acid solution from flowing out from the top of the deep well 6, so that the acid solution flows evenly into the filter pipe.

[0262] Adopt the acid injection device 3 of accurate flow control, first the 10wt.% dilute hydrochloric acid of configuration is transferred to the acid liquid storage bottle 302, according to the flow of reinjection water, the flow of acid solution is regulated. After acid is all injected, the acid in the acid liquid storage bottle 302 is cleaned with clean water and then injected into the deep well 6, valve 30302 is closed, so that the acid solution is stored in the deep well 6 for 24 to 120 hours, then, mechanical flushing is carried out in the deep well 6, and the impact of water is utilized to promote the precipitation to peel off. Simultaneously, the special steel wire brush identical with the inner diameter of the deep well 6 pipe and connected to the weight hammer is put into the well, and brushes back and forth until the reinjection water flow of the monitoring well begins to increase, proving that chemical blockage is digested, and stops acid injection.

Claims

1. A method for controlling chemical blockage during the whole cycle of deep-seated reinjection of high-mineralization mine water, the method comprising the following steps: Step 1: Collection and testing of water samples and monitoring of basic environmental indicators: The collection and testing of high-mineralized mine water samples to be reinjected and water samples of target reinjection aquifers, as well as the basic indicator monitoring of the target reinjection aquifer environment; it is characterized by: The basic indicators of the target reinjection aquifer environment include temperature and pH; Step 2: Conduct simulation tests to determine the quality of reinjection water: According to the basic indicators of the target reinjection aquifer environment obtained in step 1, a numerical model of the reinjection test of high-mineralized mine water is constructed to simulate the test when the high-mineralized mine water sample to be reinjected is mixed with the target reinjection aquifer water sample in different proportions; According to the operation of the experimental numerical model, the amount of chemical precipitation under different mixing ratios is quantitatively calculated, and based on the principle of minimum chemical precipitation, a linear superposition model of the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample is constructed to ultimately determine the water quality of the reinjection water; Step 3: Screen three filter media for removing iron and manganese ions from reinjection water and determine the best ratio: Determine the concentration of iron ions and manganese ions in the reinjected water whose water quality has been determined in step 2, set up a filtration test of iron ions and manganese ions before reinjection, preliminarily select three filter materials with strong adsorption properties for iron ions and manganese ions, and determine the optimal mixing ratio of the three filter materials; Step 4: Indoor test to determine the main chemical substances causing the reinjection blockage: First, the three filter materials in step 3 are used to treat the iron ions and manganese ions in the reinjection water to obtain treated reinjection water; Secondly, the treated reinjection water is first subjected to a simulation test of the interaction between the reinjection water and the target rock in the room before reinjection, and the chemical substances that cause blockage are identified in the rock after the simulation test; Finally, the treated reinjection water is reinjected; Step 5: Select the acid and calculate the dosage to accurately remove chemical precipitation: The type of acid agent that matches the chemical substance that causes the blockage identified in step 4 is selected, and the amount of the acid agent is finally determined based on the concentration of the acid agent and the length and radius of the return pipe diameter during actual use.

2. The method for controlling chemical plugging in the whole cycle of deep layer reinjection of high-mineralization mine water according to claim 1 is characterized in that: In step 1, the water samples of the high-mineralization mine water to be reinjected are collected from different locations underground, and the different locations underground include the roof water sprinkling point, the drainage drilling point and the central water tank; The collection of water samples from the target reinjection aquifer is carried out during drilling; The high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample are filtered and treated, and the K in the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample are respectively detected by inductively coupled ion chromatograph. + 、Na + , Ca 2+ Mg 2+ 、SO4 2- and Cl - The concentration of HCO3 in the high-mineralized mine water samples to be reinjected and the target aquifer water samples was determined by chemical method. - concentration.

3. The method for controlling chemical plugging in the whole cycle of deep layer reinjection of high-mineralization mine water according to claim 1 is characterized in that: In step 2, the determination of the water quality of the reinjection water specifically includes the following steps: Step 201, using the Interactive module in the PHREEQC numerical simulation software, a simulation test is carried out in which the ratio of the high-mineralization mine water sample to be reinjected and the target reinjection aquifer water sample is (1-9):(1-9), and the average concentration of the high-mineralization mine water sample to be reinjected and the concentration of different ions in the target reinjection aquifer water sample are input in each test; The average concentration of different ions is obtained by calculating the average value of the concentrations of different ions collected and detected in step 1; The temperature and pH set in the Interactive module are the parameters monitored by the target reinjection aquifer environment in step 1; Step 202, according to the simulation test in step 201, obtain the mixing results of 8 or more groups of different proportions of the high-mineralized mine water samples to be reinjected and the target reinjection aquifer water samples, that is, obtain the chemical precipitation amounts of 8 or more groups of different substances; Step 203, summing up the chemical precipitation amounts of each group in step 202 respectively, obtaining the sum of the chemical precipitation amounts in each group of experiments, and taking the mixing ratio of a group of high-mineralized mine water samples to be reinjected with the minimum chemical precipitation amount and the target reinjection aquifer water sample as the optimal reinjection ratio according to the principle of minimum chemical precipitation amount; The mixed water of the high-mineralized mine water sample to be reinjected and the target reinjection aquifer water sample under the optimal reinjection ratio is the reinjection water; Step 204, according to the optimal reinjection ratio in step 203, by constructing a linear superposition model, calculate the K + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - and HCO3 - The linear superposition model of the concentrations of the seven ions is: C 回注 =K1×C 矿井水 +K2×C 地下水 Where: CReinjection is the concentration of a certain ion in the reinjection water, in mg / L; K1 is the proportion of the high-mineralization mine water sample to be reinjected in the optimal reinjection ratio obtained in the mixing test; K2 is the proportion of the target reinjection aquifer water sample in the optimal reinjection ratio obtained in the mixing test; C Mine water is K in the high-mineralized mine water sample to be reinjected + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - or HCO3 - The average concentration of, in mg / L; C groundwater is the target for reinjection of K in aquifer water samples + 、Na + , Ca 2+ Mg 2+ 、SO4 2- , Cl - or HCO3 - Concentration, in mg / L.

4. The method for controlling chemical plugging during the whole cycle of deep layer reinjection of high-mineralization mine water according to claim 1, characterized in that: In step three, the optimal mixing ratio of the three filter materials is coconut shell biochar: black sand: fly ash ceramsite = 80wt.%: 10wt.%: 10wt.%.

5. The method for controlling chemical plugging during the whole cycle of deep layer reinjection of high-mineralization mine water according to claim 1, characterized in that: In step 5, when the chemical substance is calcium carbonate or magnesium carbonate, the acid agent is dilute hydrochloric acid; when the chemical substance is calcium sulfate or magnesium sulfate, the acid agent is hydrofluoric acid.

6. A full-cycle control chemical plugging system for deep reinjection of high-mineralization mine water, characterized in that: The system is used to implement the full-cycle control chemical plugging method for deep reinjection of high-mineralization mine water as described in any one of claims 1 to 5; The system comprises an intelligent mixing control device for reinjection water quality (1), an iron-manganese multi-media layered filtration tank (2), and an acid injection device (3) for accurately controlling flow rate; The reinjection water quality intelligent mixing control device (1) is used to perform step 2; The iron-manganese multi-media layered filtration tank (2) is used to perform step three; The acid injection device (3) with precise flow control is used to perform step five.

7. The deep reinjection high-mineralization mine water full-cycle controlled chemical plugging system according to claim 6, the system further comprising a water tank (4), a water pump (401) is arranged inside the water tank (4), the water pump (401) is connected to one end of the first water pipe (402), characterized in that: The other end of the first water pipe (402) is connected to the mine water inlet (101) of the reinjection water quality intelligent mixing control device (1), and the bottom of the reinjection water quality intelligent mixing control device (1) is also provided with a mixing tank drain outlet (102), and the mixing tank drain outlet (102) is connected to one end of the second water pipe (103), and the other end of the second water pipe (103) is connected to the water storage tank (5); The water storage tank (5) is further provided with a water storage tank water outlet (501), the water storage tank water outlet (501) is connected to the third water pipe (502), the third water pipe (502) is provided with a third water pipe branch port (50201), the third water pipe branch port (50201) is respectively connected to one end of the first branch (50202) of the third water pipe and one end of the second branch (50203) of the third water pipe; The first water pipe (402) is also provided with a first water pipe branch port (40201), and the first water pipe branch port (40201) is connected to the other end of the first branch (50202) of the third water pipe; The other end of the second branch (50203) of the third water delivery pipe is connected to the reinjection water inlet (201) in the iron-manganese multi-media layered filtration tank (2); The iron-manganese multi-media layered filtration pool (2) is also provided with a clean water outlet (202), the clean water outlet (202) is connected to one end of a fourth water delivery pipe (203), and the other end of the fourth water delivery pipe (203) is connected to an underground deep well (6); A second acid injection pipe (601) is also provided inside the deep well (6), and the second acid injection pipe (601) is connected to the acid liquid output port (301) in the acid injection device (3) for accurately controlling the flow rate.

8. The full-cycle controlled chemical plugging system for deep reinjection of high-mineralization mine water according to claim 6 is characterized in that: The re-injection water quality intelligent mixing control device (1) comprises a mixing tank (104), the mixing tank (104) contains an outer chamber (105), and the outer chamber (105) is surrounded by a cylinder with an open top to form a mixing chamber (106) with an open top; A first mine water inlet pipe (107) and a first groundwater inlet pipe (108) are arranged on the inner side wall of the mixing chamber (106); a plurality of nozzles (119) are evenly arranged on the first mine water inlet pipe (107) and the first groundwater inlet pipe (108); The top of the first mine water inlet pipe (107) is open, the bottom of the first mine water inlet pipe (107) is connected to the mine water pipe branch port (10901) on the second mine water inlet pipe (109), one end of the second mine water inlet pipe (109) is connected to the mine water inlet port (101) outside the bottom of the mixing tank (104), and the other end of the second mine water inlet pipe (109) is connected to the bottom of the mixing chamber (106); The top of the first groundwater inlet pipe (108) is open, the bottom of the first groundwater inlet pipe (108) is connected to one end of the second groundwater inlet pipe (110), and the other end of the second groundwater inlet pipe (110) is connected to the groundwater inlet (111) outside the bottom of the mixing tank (104); The second groundwater inlet pipe (110) is also provided with a groundwater inlet pipe branch (11001), and the groundwater inlet pipe branch (11001) is connected to the bottom of the mixing chamber (106); The passage formed by the mine water inlet (101), the second mine water inlet pipe (109), the mine water pipe branch port (10901), the first mine water inlet pipe (107) and the mixing chamber (106) is a mine water inlet passage (112); the passage formed by the mine water inlet (101), the second mine water inlet pipe (109) and the mixing chamber (106) is also a mine water inlet passage (112); The channel formed by the groundwater inlet (111), the second groundwater inlet pipe (110), the first groundwater inlet pipe (108) and the mixing chamber (106) is the groundwater inlet channel (113); the channel formed by the groundwater inlet (111), the second groundwater inlet pipe (110), the groundwater inlet pipe branch (11001) and the mixing chamber (106) is also the groundwater inlet channel (113); The mixing tank (104) is also provided with a mixing tank drain outlet (102) at the bottom, a first gap (116) is provided between the top of the outer bin (105) and the top of the mixing chamber (106), a second gap (117) is provided between the inner wall of the mixing tank (104) and the outer wall of the mixing chamber (106), and a channel connected by the first gap (116), the second gap (117) and the mixing tank drain outlet (102) is a drainage channel (118).

9. The full-cycle controlled chemical plugging system for deep reinjection of high-mineralization mine water according to claim 6, characterized in that: The iron-manganese multi-media layered filtration pool (2) comprises a first reinjection water pipeline (204) arranged horizontally, reinjection water inlets (201) are arranged at both axial ends of the first reinjection water pipeline (204), the first reinjection water pipeline (204) is evenly arranged with a plurality of reinjection water pipeline branch openings (205) opening downward along the axial direction, the plurality of reinjection water pipeline branch openings (205) are connected to the tops of a plurality of second reinjection water pipelines (206) in a one-to-one correspondence in the vertical direction, the bottoms of the plurality of second reinjection water pipelines (206) are used to inject water into a coarse sand filter layer (207), a multi-media filter layer (208) is laid at the bottom of the coarse sand filter layer (207), a bottom layer infiltration layer (209) is laid at the bottom of the multi-media filter layer (208), and a clean water outlet (202) is arranged at the bottom of the bottom layer infiltration layer (209); A first backwash pipe (211) in the horizontal direction is arranged at the bottom of the multi-media filter layer (208); backwash water inlets (212) are arranged at both radial ends of the first backwash pipe (211); a plurality of backwash pipe branch openings (213) opening upward are evenly arranged in the radial direction of the first backwash pipe (211); the plurality of backwash pipe branch openings (213) are connected to a plurality of second backwash pipes (214) in the vertical direction in a one-to-one correspondence.

10. The full-cycle controlled chemical plugging system for deep reinjection of high-mineralization mine water according to claim 6, characterized in that: The acid injection device (3) for precisely controlling the flow rate comprises an acid liquid storage bottle (302), an acid liquid outlet (301) is arranged at the bottom of the acid liquid storage bottle (302), the acid liquid outlet (301) is connected to one end of a first acid injection pipe (303), the other end of the first acid injection pipe (303) is connected to the top of a second acid injection pipe (601), and the lower half of the second acid injection pipe (601) is located in a water filter pipe (602) in a deep well (6); The bottom of the second acid injection pipe (601) is connected to the top of the acid injection pump (304), and a small hole (60101) is also provided on the portion of the second acid injection pipe (601) located inside the water filter pipe (602).

Images