An acidic mine water treatment device

Abstract

This utility model discloses an acidic mine water treatment device, including a reaction unit and a lime slurry tank connected to the reaction unit. The lime slurry tank includes a reaction cylinder, a lime slurry tank inlet and a lime slurry tank chemical inlet installed at the top of the reaction cylinder, and a lime slurry tank outlet installed on the side of the reaction cylinder. The lime slurry tank also includes a lime slurry tank agitator installed on the reaction cylinder. The lime slurry tank further includes a reflux unit installed on the reaction cylinder. The reflux unit includes an inner reflux outlet installed at the bottom of the reaction cylinder and an inner reflux inlet installed on the side of the reaction cylinder, and a reflux pipe is connected between the inner reflux outlet and the inner reflux inlet. This utility model provides an acidic mine water treatment device that, by adding a self-circulating lime slurry tank and a reflux system, enhances the reaction of lime slurry in the mixing tank, improves the utilization rate of lime slurry, and improves the precipitation effect of heavy metal ions.

Description

Technical Field

[0001] This utility model relates to the field of mine water treatment technology, specifically to an acidic mine water treatment device. Background Technology

[0002] Mine water can be mainly classified into the following categories: clean mine water, mine water containing suspended solids, high-mineralization mine water, acidic mine water, and mine water containing special pollutants.

[0003] Acidic mine water is generated from the oxidation of sulfide minerals. Under aerobic and water conditions, the oxidation of pyrite can promote the formation of SO42-. 2- The generation of Fe 2+ Fe 3+ Other metals can also be released into the water as sulfates. Acidic mine water refers to mine wastewater with a pH value between 3.0 and 6.5. The acidity of the mine water is mainly due to the impact of coal mining activities, which transform the original reducing environment into an oxidizing one. The pyrite associated with coal is oxidized to form sulfuric acid, leading to a decrease in pH and thus acidic mine water. Therefore, acidic mine water is rich in sulfate ions and metal ions (Fe2+, Fe2+, Fe3 ...3+, Fe2+, Fe3+, Fe3+, Fe2+, Fe3+, Fe3+, Fe2+, Fe3+, Fe3+, Fe2+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, Fe3+, 3+ Fe 2+ Cd 2+ Pb 2+ Zn 2+ Cu 2+ It also features a low pH (<6).

[0004] The most common method in my country currently involves raising the pH of wastewater by adding large amounts of alkaline substances such as slaked lime, anhydrous ammonia, sodium hydroxide, limestone, and sodium carbonate. This causes soluble metals to precipitate through a neutralization reaction, thereby removing metal ions. Lime is the most widely used method due to its low cost. However, the large fluctuations in the quantity and quality of mine water can easily lead to incomplete mixing and reaction of the slaked lime in the reaction tank, resulting in Fe... 2+ The problem of divalent metals not being easily precipitated and removed completely. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an acidic mine water treatment device to solve the problem of insufficient reaction in the lime reaction tank of traditional lime treatment of acidic mine water.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an acidic mine water treatment device, including a reaction device, wherein the acidic mine water treatment device further includes a lime slurry tank connected to the reaction device.

[0007] The lime slurry tank includes a reaction cylinder, a lime slurry tank water inlet and a lime slurry tank chemical inlet installed on the top of the reaction cylinder, and a lime slurry tank outlet installed on the side of the reaction cylinder.

[0008] The lime slurry tank also includes a lime slurry tank mixer installed on the reaction cylinder.

[0009] The lime slurry tank also includes a reflux unit installed on the reaction cylinder.

[0010] The reflux unit includes an inner reflux outlet installed at the bottom of the reaction cylinder and an inner reflux inlet installed on the side of the reaction cylinder. A reflux pipe is also provided between the inner reflux outlet and the inner reflux inlet.

[0011] This utility model also has the following technical features:

[0012] The reaction equipment includes a reaction tank and reaction tank inlet and reaction tank outlet located at both ends of the reaction tank.

[0013] It also includes a first partition plate, a second partition plate, and a third partition plate arranged in the reaction tank along the direction of the reaction tank inlet and the reaction tank outlet.

[0014] The first partition plate is connected to the top of the reaction tank but not to the bottom of the reaction tank.

[0015] The second partition plate is connected to the bottom of the reaction tank, but not to the top of the reaction tank.

[0016] The third partition plate is connected to the top of the reaction tank, but not to the bottom of the reaction tank.

[0017] A reaction zone is formed between the inlet of the reaction tank and the first partition plate.

[0018] A maturation zone is formed between the first partition plate and the second partition plate.

[0019] A flocculation zone is formed between the second and third partition plates.

[0020] The third partition plate and the outlet of the reaction tank form a sludge suspension zone and a clear water zone from the bottom plate of the reaction tank to the top plate of the reaction tank.

[0021] The inlet of the reaction tank is connected to the outlet of the lime slurry tank via a pipeline.

[0022] The reaction equipment also includes a lime slurry dosing port, a sludge return inlet, and a flocculant dosing port installed at the top of the reaction tank.

[0023] The locations of the lime slurry dosing port and the return sludge inlet of the reaction tank correspond to the reaction zone, and the location of the flocculant dosing port of the reaction tank corresponds to the flocculation zone.

[0024] The reaction equipment also includes a reaction tank agitator installed in the reaction zone and a flocculation tank agitator installed in the flocculation zone.

[0025] The reaction equipment also includes an aeration pipe installed in the maturation zone, which is connected to a blower.

[0026] An inclined tube packing and an overflow weir are installed between the third partition plate and the outlet of the reaction tank, from the bottom plate of the reaction tank to the top plate of the reaction tank.

[0027] The bottom of the reaction tank is also connected to a sludge tank, which is located below the flocculation zone and the sludge suspension zone.

[0028] The sludge tank is equipped with a coal sludge outlet at the bottom.

[0029] A reflux pump is also installed on the reflux pipe.

[0030] Compared with the prior art, this utility model has the following technical effects:

[0031] (I) The acidic mine water treatment device provided by this utility model enhances the lime slurry reaction in the mixing tank by adding a self-circulating lime slurry tank and a reflux system, thereby improving the utilization rate of lime slurry and the precipitation effect of heavy metal ions.

[0032] (II) This utility model provides an acidic mine water treatment device that promotes Fe production by adding aeration equipment to the reaction tank. 2+ Divalent metals are oxidized to Fe 3+ This improves the efficiency of heavy metal ion precipitation.

[0033] (III) The acidic mine water treatment device provided by this utility model has a simple structure, is easy to operate, is safe and reliable, and has strong adaptability. Attached Figure Description

[0034] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0035] Figure 2 This is a schematic diagram of the lime slurry pool.

[0036] Figure 3 This is a schematic diagram of the reaction equipment.

[0037] The meanings of the labels in the attached diagram are as follows:

[0038] 1-Reaction equipment, 2-Lime slurry tank.

[0039] 1-1-Reaction tank, 1-2-Reaction tank inlet, 1-3-Reaction tank outlet, 1-4-First partition plate, 1-5-Second partition plate, 1-6-Third partition plate, 1-7-Reaction zone, 1-8-Maturation zone, 1-9-Flocculation zone, 1-10-Sludge suspension zone, 1-11-Clear water zone, 1-12-Reaction tank lime slurry dosing port, 1-13-Reaction tank return sludge inlet, 1-14-Reaction tank flocculant dosing port, 1-15-Reaction tank mixer, 1-16-Flocculation tank mixer, 1-17-Aeration pipe, 1-18-Blower, 1-19-Inclined tube packing, 1-20-Overflow weir, 1-21-Sludge tank, 1-22-Coal slime outlet.

[0040] 2-1-Reaction cylinder, 2-2-Water inlet of lime slurry tank, 2-3-Medicine inlet of lime slurry tank, 2-4-Outlet of lime slurry tank, 2-5-Mixed lime slurry tank mixer, 2-6-Reflux unit.

[0041] 2-6-1-Internal reflux outlet, 2-6-2-Internal reflux inlet, 2-6-3-Reflux pipe, 2-6-4-Reflux pump.

[0042] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0043] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0044] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0045] Example 1:

[0046] This embodiment provides an acidic mine water treatment device, such as... Figures 1-3 As shown, the device includes a reaction unit 1, and the acidic mine water treatment device also includes a lime slurry tank 2 connected to the reaction unit 1.

[0047] The lime slurry tank 2 includes a reaction cylinder 2-1, a lime slurry tank water inlet 2-2 and a lime slurry tank chemical inlet 2-3 installed on the top of the reaction cylinder 2-1, and a lime slurry tank outlet 2-4 installed on the side of the reaction cylinder 2-1.

[0048] The lime slurry tank 2 also includes a lime slurry tank mixer 2-5 installed on the reaction cylinder 2-1.

[0049] The lime slurry tank 2 also includes a reflux unit 2-6 installed on the reaction cylinder 2-1.

[0050] The reflux unit 2-6 includes an inner reflux outlet 2-6-1 installed at the bottom of the reaction cylinder 2-1 and an inner reflux inlet 2-6-2 installed on the side of the reaction cylinder 2-1. A reflux pipe 2-6-3 is also provided between the inner reflux outlet 2-6-1 and the inner reflux inlet 2-6-2.

[0051] The technical problem this invention aims to solve is that traditional lime treatment methods often fail to completely precipitate and remove divalent metals such as Fe2+ from acidic mine water. By setting up a dedicated lime slurry tank 2 and reflux units 2-6, the problem of uneven mixing in the reaction tank caused by directly adding slaked lime is solved.

[0052] Firstly, this invention uses a lime slurry tank with internal circulation to hydrate quicklime, which not only alleviates the problem of easy structure formation during lime dissolution, but also effectively improves the reaction efficiency of lime.

[0053] This invention uses air aeration instead of mechanical stirring in the maturation zone. On the one hand, it can oxidize divalent ions that are not easy to precipitate into trivalent ions that are easy to precipitate, thereby improving the removal efficiency of heavy metal ions. On the other hand, it can alleviate the structural problems of the stirrer.

[0054] This invention employs a sludge recirculation method, returning the sludge from sludge tanks 1-21 to reaction zones 1-7. Firstly, this increases the number of crystal nuclei during the coagulation and sedimentation stage, promoting floc aggregation and improving sedimentation efficiency. Secondly, since the treatment efficiency is highest when the polymeric flocculant dosage covers half of the colloidal surface area, sludge recirculation allows for the reuse of flocculant and lime, thereby reducing the dosage. Finally, sludge recirculation in the sedimentation zone controls the formation of a suspended sludge layer, effectively filtering fine suspended solids and further improving sedimentation efficiency.

[0055] As a preferred embodiment:

[0056] The reaction equipment 1 includes a reaction tank 1-1 and reaction tank inlet 1-2 and reaction tank outlet 1-3 located at both ends of the reaction tank 1-1.

[0057] It also includes a first partition plate 1-4, a second partition plate 1-5, and a third partition plate 1-6 arranged in the reaction tank 1-1 along the direction of the reaction tank inlet 1-2 and the reaction tank outlet 1-3.

[0058] The first partition plate 1-4 is connected to the top of the reaction tank 1-1, but not to the bottom of the reaction tank 1-1.

[0059] The second partition plate 1-5 is connected to the bottom of the reaction tank 1-1, but not to the top of the reaction tank 1-1.

[0060] The third partition plate 1-6 is connected to the top of the reaction tank 1-1, but not to the bottom of the reaction tank 1-1.

[0061] The reaction zone 1-7 is formed between the inlet 1-2 of the reaction tank and the first partition plate 1-4.

[0062] A maturation zone 1-8 is formed between the first partition plate 1-4 and the second partition plate 1-5.

[0063] A flocculation zone 1-9 is formed between the second partition plate 1-5 and the third partition plate 1-6.

[0064] The third partition plate 1-6 and the outlet 1-3 of the reaction tank form a sludge suspension zone 1-10 and a clear water zone 1-11 from the bottom plate of the reaction tank 1-1 towards the top plate of the reaction tank 1-1.

[0065] The inlet 1-2 of the reaction tank is connected to the outlet 2-4 of the lime slurry tank via pipe 3.

[0066] As a preferred embodiment:

[0067] The reaction equipment 1 also includes a reaction pool lime slurry dosing port 1-12, a reaction pool return sludge inlet 1-13, and a reaction pool flocculant dosing port 1-14, all installed at the top of the reaction pool 1-1.

[0068] The positions of the lime slurry dosing port 1-12 and the return sludge inlet 1-13 in the reaction tank correspond to the positions of reaction zone 1-7, and the positions of the flocculant dosing port 1-14 in the reaction tank correspond to the positions of flocculation zone 1-9.

[0069] The reaction equipment 1 also includes a reaction tank agitator 1-15 installed in the reaction zones 1-7 and a flocculation tank agitator 1-16 installed in the flocculation zones 1-9.

[0070] As a preferred embodiment:

[0071] The reaction equipment 1 also includes an aeration pipe 1-17 installed in the maturation zone 1-8, and the aeration pipe 1-17 is connected to a blower 1-18.

[0072] The third partition plate 1-6 and the outlet 1-3 of the reaction tank are connected by inclined tube packing 1-19 and overflow weir 1-20 from the bottom plate of the reaction tank 1-1 to the top plate of the reaction tank 1-1.

[0073] By adding an aeration device, Fe is promoted 2+ Oxidized to Fe 3+ Solve Fe 2+ The problem of divalent metals not easily precipitating completely.

[0074] As a preferred embodiment:

[0075] The bottom of the reaction tank 1-1 is also connected to a sludge tank 1-21, which is located below the flocculation zone 1-9 and the sludge suspension zone 1-10.

[0076] The bottom of the sludge tank 1-21 is equipped with a coal slime outlet 1-22.

[0077] The sludge flows out from the coal slime outlet 1-22, and a portion of it is returned sludge and enters the reaction zone 1-7 from the return sludge inlet 1-13 of the reaction tank.

[0078] As a preferred embodiment:

[0079] A return pump 2-6-4 is also installed on the return pipe 2-6-3.

[0080] The specific working process of this utility model:

[0081] Lime slurry tank 2: Tap water enters the lime slurry tank through inlet 2-2, and quicklime is added through inlet 2-3. After being fully stirred and dissolved by the lime slurry tank mixer 2-5, it flows out through outlet 2-4. The mixed liquid in the tank flows out through internal return outlet 2-6-1, is pressurized by circulation pump 2-6-4, and then flows into the tank through internal return inlet 2-6-2, swirling along the tank wall. This creates a swirling flow within the tank, alleviating the problem of quicklime clumping and scaling on the tank wall after being added through inlet 2-3.

[0082] (2) The acidic mine water (raw water) to be treated enters the reaction zone 1-7 of reaction tank 1-1 from the inlet 1-2 of the reaction tank. The lime slurry is added from the lime slurry dosing port 1-12 of the reaction tank, and the return sludge is added from the return sludge inlet 1-13 of the reaction tank. After the raw water, sludge and lime slurry are fully mixed in the reaction tank mixer 1-15, the heavy metal ions in the water gradually generate water-insoluble hydroxides under alkaline conditions. The mixed liquid flows into the maturation zone 1-8. The blower 1-18 sends air into the maturation zone 1-8 through the aeration pipe 1-17, and the water quality continues to be mixed by aeration, and the divalent metal ions (divalent iron ions) that are not easy to precipitate are oxidized into trivalent iron ions that are easy to precipitate. The mixed liquor continues to flow out of flocculation zone 1-9, and a co-flocculating agent is added through the flocculant dosing port 1-14 in the reaction tank. Under the stirring of the agitator 1-16 in the flocculation tank, the heavy metal precipitates react with the co-flocculating agent to rapidly form larger flocs, which gradually aggregate into flocs. The mixed liquor slowly enters the sludge suspension zone 1-10, and flows upward along the inclined tube packing 1-19. The clear water enters the clear water zone 1-11, is collected by the overflow weir 1-20, and discharged from the effluent outlet 1-3 of the reaction tank. The sludge separates and settles from the sludge suspension zone 1-10 to the sludge zone 1-21 by its own gravity.

[0083] (3) The sludge flows out from the coal slime outlet 1-22, and part of it is returned sludge from the return sludge inlet 1-13 of the reaction tank into the reaction zone 1-7, so that the lime and water treatment agents are fully utilized to save agents, and crystal nuclei are added to the front end to improve the treatment effect of the equipment. Finally, it can also provide sludge to the reaction tank 2, maintain the amount of sludge in the sludge suspension zone 1-10 and improve the treatment efficiency.

[0084] With raw water pH 4 and total iron concentration of 200 mg / L, using this device, with a reflux ratio of 10%, the effluent pH is 8, the iron removal rate reaches 90%, and the amount of lime added is reduced by 10% compared to when there is no reflux.

[0085] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. An acidic mine water treatment device, comprising a reaction unit (1), characterized in that, The acidic mine water treatment device also includes a lime slurry tank (2) connected to the reaction equipment (1); The lime slurry tank (2) includes a reaction cylinder (2-1), a lime slurry tank water inlet (2-2) and a lime slurry tank chemical inlet (2-3) installed on the top of the reaction cylinder (2-1), and a lime slurry tank outlet (2-4) installed on the side of the reaction cylinder (2-1); The lime slurry tank (2) also includes a lime slurry tank agitator (2-5) installed on the reaction cylinder (2-1); The lime slurry tank (2) also includes a reflux unit (2-6) installed on the reaction cylinder (2-1); The reflux unit (2-6) includes an inner reflux outlet (2-6-1) installed at the bottom of the reaction cylinder (2-1) and an inner reflux inlet (2-6-2) installed on the side of the reaction cylinder (2-1). A reflux pipe (2-6-3) is also provided between the inner reflux outlet (2-6-1) and the inner reflux inlet (2-6-2).

2. The acidic mine water treatment device as described in claim 1, characterized in that, The reaction equipment (1) includes a reaction tank (1-1) and reaction tank inlets (1-2) and reaction tank outlets (1-3) located at both ends of the reaction tank (1-1); It also includes a first partition plate (1-4), a second partition plate (1-5), and a third partition plate (1-6) arranged in the reaction tank (1-1) along the direction of the reaction tank inlet (1-2) and the reaction tank outlet (1-3); The first partition plate (1-4) is connected to the top of the reaction tank (1-1) but not to the bottom of the reaction tank (1-1); The second partition plate (1-5) is connected to the bottom of the reaction tank (1-1) but not to the top of the reaction tank (1-1); The third partition plate (1-6) is connected to the top of the reaction tank (1-1) but not to the bottom of the reaction tank (1-1); A reaction zone (1-7) is formed between the inlet (1-2) of the reaction tank and the first partition plate (1-4); A maturation zone (1-8) is formed between the first partition plate (1-4) and the second partition plate (1-5); A flocculation zone (1-9) is formed between the second partition plate (1-5) and the third partition plate (1-6). The third partition plate (1-6) and the outlet of the reaction tank (1-3) form a sludge suspension zone (1-10) and a clear water zone (1-11) from the bottom plate of the reaction tank (1-1) towards the top plate of the reaction tank (1-1); The inlet (1-2) of the reaction tank is connected to the outlet (2-4) of the lime slurry tank via a pipe (3).

3. The acidic mine water treatment device as described in claim 2, characterized in that, The reaction equipment (1) further includes a reaction tank lime slurry dosing port (1-12), a reaction tank return sludge inlet (1-13), and a reaction tank flocculant dosing port (1-14) installed at the top of the reaction tank (1-1); The positions of the lime slurry dosing port (1-12) and the return sludge inlet (1-13) of the reaction tank correspond to the reaction zone (1-7), and the position of the flocculant dosing port (1-14) of the reaction tank corresponds to the flocculation zone (1-9). The reaction equipment (1) further includes a reaction tank agitator (1-15) installed in the reaction zone (1-7) and a flocculation tank agitator (1-16) installed in the flocculation zone (1-9).

4. The acidic mine water treatment device as described in claim 2, characterized in that, The reaction equipment (1) further includes an aeration pipe (1-17) installed in the maturation zone (1-8), and the aeration pipe (1-17) is connected to a blower (1-18); The third partition plate (1-6) and the outlet of the reaction tank (1-3) are connected by inclined tube packing (1-19) and overflow weir (1-20) installed from the bottom plate of the reaction tank (1-1) towards the top plate of the reaction tank (1-1).

5. The acidic mine water treatment device as described in claim 2, characterized in that, The bottom of the reaction tank (1-1) is also connected to a sludge tank (1-21), which is located below the flocculation zone (1-9) and the sludge suspension zone (1-10). The sludge tank (1-21) is equipped with a coal slime outlet (1-22) at the bottom.

6. The acidic mine water treatment device as described in claim 1, characterized in that, A reflux pump (2-6-4) is also installed on the reflux pipe (2-6-3).

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