Mine water treatment device

Abstract

The utility model relates to the technical field of water treatment, and provides a mine water treatment device which comprises a mixing mechanism, a concentration mechanism and a first granulation mechanism. Wherein the mixing mechanism is connected with a scale inhibitor storage tank, and the mixing mechanism is used for mixing mine water and a scale inhibitor to form mine water treatment liquid. The concentration mechanism is connected with the mixing mechanism and is used for concentrating the mine water treatment liquid to form first produced water and a first concentrated solution; the first granulation mechanism is connected with the discharge end of a first concentrated solution in the concentration mechanism, the first granulation mechanism is further connected with a coagulant storage tank, the coagulant storage tank is used for adding a coagulant into the first concentrated solution in the first granulation mechanism, and the first granulation mechanism is used for granulating the first concentrated solution added with the coagulant; first particles and first granulated produced water are formed. According to the method, the scale inhibitor is added into the coagulation water, enrichment of calcium ions and sulfate ions is improved, then calcium sulfate is recycled through granulation, and waste of calcium ions enriched in sludge is avoided.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a mine water treatment device. Background Technology

[0002] Mine water refers to all water that enters the underground mining space during coal mining operations; it is groundwater polluted during coal mining. Coal mine water is often highly mineralized, with a total dissolved solids (TDS) concentration greater than or equal to 1000 mg / L, making it unusable after simple treatment. Furthermore, due to the lack of receiving water bodies, mine water discharge causes soil erosion, salinization, and vegetation withering, thus limiting its discharge.

[0003] Mine water contains calcium and sulfate ions. How to recover and utilize these ions to achieve low-cost and high-conversion-rate treatment of mine water has become an urgent technical problem that needs to be solved. Utility Model Content

[0004] Based on this, this application provides a mine water treatment device with low processing cost and high resource conversion rate.

[0005] This application provides a mine water treatment device, the mine water treatment device comprising:

[0006] A mixing mechanism is connected to a scale inhibitor storage tank. The mixing mechanism is used to mix mine water and scale inhibitor to form a mine water treatment solution.

[0007] A concentration unit, connected to the mixing unit, is used to concentrate the mine water treatment fluid to form a first product water and a first concentrate.

[0008] The first granulation unit is connected to the discharge end of the first concentrated liquid in the concentration unit. The first granulation unit is also connected to a coagulant storage tank. The coagulant storage tank is used to add coagulant to the first concentrated liquid in the first granulation unit. The first granulation unit is used to granulate the first concentrated liquid with added coagulant to form first particles and first granulated water.

[0009] In some embodiments, the mine water treatment device further includes a pretreatment mechanism connected to the mixing mechanism, the pretreatment mechanism being used to filter the mine water before it enters the mixing mechanism.

[0010] In some embodiments, the mine water treatment device further includes a calcination mechanism connected to the first granulation mechanism, the calcination mechanism being used to calcine the first particles formed by the calcination mechanism.

[0011] In some embodiments, the mine water treatment device further includes a second granulation mechanism and a carbonate storage tank. The second granulation mechanism is connected to the discharge end of the first granulation water in the first granulation mechanism, and the carbonate storage tank is connected to the second granulation mechanism. The carbonate storage tank is used to add carbonate to the first granulation water discharged into the second granulation mechanism. The second granulation mechanism is used to granulate the first granulation water containing the added carbonate to form second particles and second granulation water.

[0012] In some embodiments, the mine water treatment device further includes a nanofiltration unit connected to the second granulation unit. The nanofiltration unit is used to perform nanofiltration treatment on the second granulated permeate formed by the second granulation unit to form a second concentrate and a second permeate.

[0013] In some embodiments, the mine water treatment device further includes a recycled water storage tank connected to the concentration mechanism, the recycled water storage tank being used to store the first product water generated by the concentration mechanism.

[0014] In some embodiments, the recycled water storage tank is also connected to the nanofiltration unit, and the recycled water storage tank is also used to store the second product water formed by the nanofiltration unit.

[0015] In some embodiments, the mine water treatment device further includes an evaporation crystallization mechanism connected to the nanofiltration mechanism, which is used to perform evaporation crystallization treatment on the second concentrate formed by the nanofiltration mechanism to form crystalline salt and steam.

[0016] In some embodiments, the mine water treatment device further includes a heat exchanger disposed between the concentration mechanism and the first granulation mechanism, the heat exchanger being used to heat the first concentrate before it enters the first granulation mechanism.

[0017] In some embodiments, the heat exchanger is also connected to the evaporation and crystallization mechanism, and the steam discharged from the evaporation and crystallization mechanism is fed into the heat exchanger as a heat source.

[0018] Compared with traditional technologies, this application has at least the following beneficial effects:

[0019] This mine water treatment device includes a mixing mechanism, a concentration mechanism, and a first granulation mechanism. The mixing mechanism adds a scale inhibitor to the mine water, preventing scale formation of sulfate and calcium ions during concentration, thus enriching these ions. The first concentrated solution is then discharged to the first granulation mechanism where it is mixed with a coagulant to neutralize the scale inhibitor, allowing the sulfate and calcium ions to react and form first particles containing calcium sulfate precipitate. Further, the calcium sulfate precipitate can be calcined to convert it into α-gypsum, increasing its resource utilization rate. The remaining calcium ions can be converted into calcium carbonate precipitate in the second granulation mechanism, which can be used for flue gas desulfurization. In addition, sulfate can be extracted as sodium sulfate crystals, achieving resource utilization of the mine water and reducing treatment costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a mine water treatment device provided in one embodiment of this application.

[0021] Among them, 1-mixing mechanism; 2-scale inhibitor storage tank; 3-concentration mechanism; 4-first granulation mechanism; 5-coagulant storage tank; 6-pretreatment mechanism; 7-calcination mechanism; 8-second granulation mechanism; 9-carbonate storage tank; 10-nanofiltration mechanism; 11-reclaimed water storage tank; 12-evaporation crystallization mechanism; 13-heat exchanger; 14-regulation tank. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings, embodiments, and examples. These embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present application. The purpose of providing these embodiments and examples is to enable a more thorough and comprehensive understanding of the disclosure of the present application. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. Furthermore, numerous specific details are set forth in the following description to provide a fuller understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0023] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," and "set" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0026] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0027] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0028] All references to this application are incorporated herein by reference as if each document were individually incorporated herein by reference. Unless they conflict with the purpose and / or technical solution of this application, all cited references are incorporated herein by reference in their entirety and for all purposes. When references are cited in this application, the definitions of relevant technical features, terms, nouns, phrases, etc., are also incorporated herein by reference. Examples and preferred embodiments of the cited technical features may also be incorporated herein by reference, but only to the extent that they enable the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, this application shall prevail or modifications shall be made adaptably to the description in this application.

[0029] Traditional techniques involve adding coagulants or precipitants to mine water in high-efficiency sedimentation tanks to remove calcium ions, sulfate ions, and suspended solids. Calcium ions are removed as sludge and treated as solid waste. The mine water is then subjected to membrane filtration to meet discharge requirements, but the calcium ions in the mine water are not utilized as a resource.

[0030] Based on this, this application provides a mine water treatment device, which includes a mixing mechanism 1, a concentration mechanism 3, and a first granulation mechanism 4.

[0031] The system includes a mixing mechanism 1 connected to a scale inhibitor storage tank 2, used to mix mine water and scale inhibitor to form a mine water treatment solution. A concentration mechanism 3 connected to the mixing mechanism 1 is used to concentrate the mine water treatment solution to form first product water and a first concentrate. A first granulation mechanism 4 connected to the discharge end of the first concentrate in the concentration mechanism 3 is also connected to a coagulant storage tank 5, used to add coagulant to the first concentrate in the first granulation mechanism 4. The first granulation mechanism 4 is used to granulate the first concentrate containing the added coagulant to form first particles and first granulated product water.

[0032] The mine water treatment device of this application includes a mixing mechanism 1, a concentration mechanism 3, and a first granulation mechanism 4. The mixing mechanism 1 adds a scale inhibitor to the mine water, preventing sulfate and calcium ions from forming scale during the concentration process, thus enriching sulfate and calcium ions. Then, the first concentrated liquid is discharged to the first granulation mechanism 4 to mix with a coagulant, which eliminates the scale inhibitor's effect and causes sulfate and calcium ions to react, forming the first particles containing calcium sulfate precipitate. This realizes the resource utilization of mine water and reduces treatment costs.

[0033] It is understood that the concentration unit 3 in this application can use membrane filtration to concentrate the mine water treatment liquid, for example, it can be reverse osmosis filtration.

[0034] It is understood that in the first granulation mechanism 4 of this application, the first concentrate and the coagulant react to form precipitated particles, thereby forming the first particles. The first particles can then be separated from the first granulation product water by fluidization. For example, the first granulation mechanism 4 can be a fluidized bed granulation device, which is divided into an inlet zone, a drug inlet zone, a granulation zone and a clear water zone from bottom to top. The mixed liquid circulates fluidized in the device, and during the flow, chemical reaction, crystallization and precipitation are achieved to form particles. The particles settle to the bottom of the device and are discharged, while the product water is discharged from the top.

[0035] Understandably, scale inhibitors can be selected appropriately based on the water quality of the mine water. Scale inhibitors are additives that prevent calcium ions and sulfate ions from reacting to form calcium sulfate precipitate. For example, scale inhibitors can be organophosphorus and polycarboxylic acid composite scale inhibitors or polyphosphate scale inhibitors, etc.

[0036] Understandably, coagulants can be selected appropriately based on the quality of the mine water. For example, coagulants can be PAC (polyaluminum chloride) or PFS (polyferric sulfate), etc.

[0037] In some embodiments, the mine water treatment device further includes a pretreatment mechanism 6, which is connected to the mixing mechanism 1. The pretreatment mechanism 6 is used to filter the mine water before it enters the mixing mechanism 1. For example, an adsorbent or similar substance can be added to the mine water to remove colloids and suspended solids, thereby avoiding any impact on the concentration mechanism 3 and improving the purity of the concentration mechanism 3.

[0038] In some embodiments, the mine water treatment device further includes a regulating tank 14, which is connected to the mine water inlet of the pretreatment unit 6. The regulating tank 14 is used to store mine water. This application uses the regulating tank 14 to store mine water, thereby preventing significant changes in the water quality and avoiding impact on the treatment effect.

[0039] In some embodiments, the mine water treatment apparatus further includes a calcination mechanism 7, which is connected to the first granulation mechanism 4. The calcination mechanism 7 is used to calcine the first particles formed by the calcination mechanism 7. Optionally, the calcination temperature of the calcination mechanism 7 is 120°C to 200°C. Since the particles in the first particles are mainly calcium sulfate, this application can form α-gypsum through calcination treatment, which can be used in building materials or arts and crafts, thereby avoiding the resource waste caused by calcium sludge generated by conventional equipment.

[0040] In some embodiments, the mine water treatment apparatus further includes a second granulation mechanism 8 and a carbonate storage tank 9. The second granulation mechanism 8 is connected to the discharge end of the first granulation permeate in the first granulation mechanism 4. The carbonate storage tank 9 is connected to the second granulation mechanism 8 and is used to add carbonate to the first granulation permeate discharged into the second granulation mechanism 8. The second granulation mechanism 8 is used to granulate the first granulation permeate containing carbonate to form second particles and second granulation permeate. Optionally, the carbonate may be sodium carbonate.

[0041] This application utilizes a second granulation unit 8 to treat the first granulation wastewater from the first granulation unit 4. By adding carbonate, residual calcium ions in the first granulation wastewater are further recovered, and the resulting calcium carbonate particles can be used as a desulfurizing agent for flue gas desulfurization. Because the first granulation wastewater contains relatively few calcium ions, the amount of carbonate used is reduced compared to traditional technologies. This application effectively ensures the resource recovery of sulfate and calcium ions through two granulation processes.

[0042] In some embodiments, the mine water treatment apparatus further includes a nanofiltration unit 10, which is connected to the second granulation unit 8. The nanofiltration unit 10 is used to perform nanofiltration treatment on the second granulation permeate formed by the second granulation unit 8 to form a second concentrate and a second permeate. By performing nanofiltration treatment on the permeate of the second granulation unit 8, this application can, on the one hand, treat and reuse wastewater, and on the other hand, concentrate wastewater to recover crystalline salts.

[0043] In some embodiments, the mine water treatment apparatus further includes a recycled water storage tank 11, which is connected to the concentration mechanism 3 and is used to store the first product water generated by the concentration mechanism 3.

[0044] In some embodiments, the recycled water storage tank 11 is also connected to the nanofiltration unit 10, and the recycled water storage tank 11 is also used to store the second product water formed by the nanofiltration unit 10.

[0045] It is understood that the recycled water in the recycled water storage tank 11 of this application can be used to regulate the mine water in the regulating pool 14.

[0046] In some embodiments, the mine water treatment apparatus further includes an evaporation crystallization mechanism 12, which is connected to the nanofiltration mechanism 10. The evaporation crystallization mechanism 12 is used to perform evaporation crystallization treatment on the second concentrate formed by the nanofiltration mechanism 10 to form crystalline salt and steam. This application utilizes evaporation crystallization to recover crystalline salt, such as sodium chloride, from the second concentrate, thereby improving the resource recovery efficiency of the treatment apparatus.

[0047] In some embodiments, the mine water treatment apparatus further includes a heat exchanger 13, which is disposed between the concentration mechanism 3 and the first granulation mechanism 4. The heat exchanger 13 is used to heat the first concentrate before it enters the first granulation mechanism 4.

[0048] In some embodiments, the heat exchanger 13 is also connected to the evaporation and crystallization mechanism 12, and the steam discharged from the evaporation and crystallization mechanism 12 is fed into the heat exchanger 13 as a heat source. Optionally, the temperature of the first concentrate after heating can be 35°C to 45°C.

[0049] This application utilizes the steam generated by the evaporation crystallization mechanism 12 as the heat source of the heat exchanger 13 to heat the first concentrated liquid entering the first granulation mechanism 4, thereby reducing the solubility product of calcium sulfate and improving the crystallization precipitation ability of calcium sulfate.

[0050] Exemplarily, a method for resource-based treatment of mine water using the aforementioned mine water treatment device is provided, comprising the following steps:

[0051] S1. Pass the mine water into the regulating tank 14;

[0052] S2. The mine water in the equalization tank 14 is passed into the pretreatment unit 6 to remove colloids and suspended solids from the mine water;

[0053] S3. Discharge the pretreated mine water from the pretreatment unit 6 into the mixing unit 1, and introduce scale inhibitor into the mixing unit 1 to mix and obtain the mine water treatment solution.

[0054] S4. The mine water treatment fluid is fed into the concentration unit 3 and concentrated to obtain the first concentrated liquid and the first product water. The first product water is discharged to the reuse water storage tank 11 for reuse.

[0055] S5. The first concentrated liquid is heat exchanged through heat exchanger 13 and then enters the first granulation unit 4. A coagulant is added to the first granulation unit 4 to crystallize and precipitate sulfate and calcium ions in the first concentrated liquid, separating them to form the first particles and the first granulation water. The first particles are discharged into the calcination unit 7 for calcination to obtain α-gypsum.

[0056] S6. Discharge the first granulation water into the second granulation unit 8, and add sodium carbonate to the second granulation unit 8 to precipitate calcium ions in the first granulation water to form calcium carbonate particles, which are then separated to form the second particles and the second granulation water. The second particles can be used as a desulfurizing agent for flue gas desulfurization.

[0057] S7. The second granulation product water is passed into the nanofiltration unit 10, and the resulting concentrated liquid enters the evaporation and crystallization unit 12 to form salt crystals. The steam generated by the evaporation and crystallization unit 12 enters the heat exchanger 13 as a heat source.

[0058] In summary, the mine water treatment device of this application includes a mixing mechanism 1, a concentration mechanism 3, and a first granulation mechanism 4. The mixing mechanism 1 adds a scale inhibitor to the mine water, preventing scale formation of sulfate and calcium ions during the concentration process, thus enriching sulfate and calcium ions. The first concentrated liquid is then discharged to the first granulation mechanism 4 to mix with a coagulant, negating the scale inhibitor's effect and allowing sulfate and calcium ions to react, forming first particles containing calcium sulfate precipitates. Furthermore, the calcium sulfate precipitate can be further converted into α-gypsum through calcination, increasing its resource utilization rate. The remaining calcium ions can be converted into calcium carbonate precipitate in the second granulation mechanism and applied to flue gas desulfurization. In addition, sulfate can be extracted in the form of sodium sulfate crystals, realizing the resource utilization of mine water and reducing treatment costs.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A mine water treatment device, characterized in that, The mine water treatment device includes: A mixing mechanism connected to a scale inhibitor storage tank is used to mix mine water and scale inhibitor to form a mine water treatment solution. A concentration unit, connected to the mixing unit, is used to concentrate the mine water treatment fluid to form a first product water and a first concentrate; and... The first granulation unit is connected to the discharge end of the first concentrated liquid in the concentration unit. The first granulation unit is also connected to a coagulant storage tank. The coagulant storage tank is used to add coagulant to the first concentrated liquid in the first granulation unit. The first granulation unit is used to granulate the first concentrated liquid with added coagulant to form first particles and first granulated water.

2. The mine water treatment device as described in claim 1, characterized in that, The mine water treatment device further includes a pretreatment mechanism connected to the mixing mechanism. The pretreatment mechanism is used to filter the mine water before it enters the mixing mechanism.

3. The mine water treatment device as described in claim 1, characterized in that, The mine water treatment device further includes a calcination mechanism, which is connected to the first granulation mechanism. The calcination mechanism is used to calcine the first particles formed by the calcination mechanism.

4. The mine water treatment device according to any one of claims 1-3, characterized in that, The mine water treatment device further includes a second granulation mechanism and a carbonate storage tank. The second granulation mechanism is connected to the discharge end of the first granulation water in the first granulation mechanism. The carbonate storage tank is connected to the second granulation mechanism. The carbonate storage tank is used to add carbonate to the first granulation water discharged into the second granulation mechanism. The second granulation mechanism is used to granulate the first granulation water containing the added carbonate to form second particles and second granulation water.

5. The mine water treatment device as described in claim 4, characterized in that, The mine water treatment device further includes a nanofiltration unit, which is connected to the second granulation unit. The nanofiltration unit is used to perform nanofiltration treatment on the second granulated water produced by the second granulation unit to form a second concentrate and a second product water.

6. The mine water treatment device as described in claim 5, characterized in that, The mine water treatment device also includes a recycled water storage tank, which is connected to the concentration mechanism and is used to store the first product water generated by the concentration mechanism.

7. The mine water treatment device as described in claim 6, characterized in that, The recycled water storage tank is also connected to the nanofiltration unit, and the recycled water storage tank is also used to store the second product water formed by the nanofiltration unit.

8. The mine water treatment device as described in claim 5, characterized in that, The mine water treatment device also includes an evaporation crystallization mechanism, which is connected to the nanofiltration mechanism. The evaporation crystallization mechanism is used to perform evaporation crystallization treatment on the second concentrate formed by the nanofiltration mechanism to form crystalline salt and steam.

9. The mine water treatment device as described in claim 8, characterized in that, The mine water treatment device further includes a heat exchanger, which is disposed between the concentration mechanism and the first granulation mechanism. The heat exchanger is used to heat the first concentrate before it enters the first granulation mechanism.

10. The mine water treatment device as described in claim 9, characterized in that, The heat exchanger is also connected to the evaporation and crystallization mechanism, and the steam discharged from the evaporation and crystallization mechanism is fed into the heat exchanger as a heat source.

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