Mine water magnetic coagulating sedimentation rapid hardness removal system

Abstract

The utility model provides a magnetic coagulation sedimentation rapid hardness removal system for mine water, which aims to solve the technical problems of high medicament consumption and low hardness removal efficiency in a high-density sedimentation process, and comprises a raw water inlet unit, a hardness removal unit, a magnetic coagulation unit, a magnetic sedimentation unit, a magnetic recovery unit and a dosing unit which are connected through pipelines, the chemical adding unit comprises a controller, and a water inlet flow meter, a water inlet quality monitor, a water outlet quality monitor, an image acquisition instrument and a chemical adding pump which are respectively in communication connection with the controller; the controller is used for controlling the adding amount of the medicament adding pump according to the measured water inlet flow value, the measured pH value and the measured calcium and magnesium ion content of the inlet water, the measured pH value and the measured calcium and magnesium ion content of the outlet water and the alumen ustum image of the magnetic floc precipitation condition. The system disclosed by the utility model is good in hardness removal effect, realizes unattended operation, adopts intelligent chemical feeding instead of manual operation compared with a traditional high-density sedimentation tank, realizes that the total hydraulic retention time is shortened by more than 25%, and achieves the effect of rapid hardness removal.

Description

Technical Field

[0001] This utility model relates to the field of mine water hardening technology, specifically to a rapid hardening removal system for mine water using magnetic coagulation sedimentation. Background Technology

[0002] Mine water refers to wastewater generated during coal mine construction and mining processes, resulting from underground water inflow, surface seepage, and drainage from underground production. It is characterized by diverse water quality types, large fluctuations in quantity and quality, high total dissolved solids (TDS), high suspended solids (pH) concentration that is difficult to settle, and the potential presence of heavy metals, fluorides, and other toxic and harmful substances. Typically, the pH and TDS of mine water range from several hundred to several thousand mg / L, with some reaching pH levels as high as 10,000 mg / L and TDS levels as high as 8,000 mg / L.

[0003] Mine water hardening technology mainly refers to removing hardness components from water, namely calcium (Ca). 2+ Mg 2+ Commonly used methods include ion exchange and chemical softening. Ion exchange softening utilizes the exchange of active cations in resin with hardness ions in the water. Calcium, magnesium, and other divalent or higher ions in the water are replaced by sodium or hydrogen ions, reducing the hardness of the effluent. However, this method requires the addition of large amounts of regeneration agents to restore the resin's ion exchange capacity. The water consumption and wastewater treatment during regeneration are the biggest challenges facing this technology. Furthermore, when the influent hardness is high and organic pollution is severe, the resin regeneration frequency is high and its lifespan is shortened. It is mostly suitable for further softening after pretreatment softening. Chemical softening mainly involves adding chemical agents (caustic soda, soda ash, etc.) to precipitate / clarify calcium and magnesium ions through chemical reactions, thereby reducing water hardness. Commonly used precipitation / clarification technologies include mechanically stirred clarifiers, hydraulic circulation clarifiers, magnetic coagulation sedimentation tanks, and inclined tube sedimentation tanks. Among these, magnetic coagulation sedimentation tanks are widely used due to their advantages such as high sedimentation efficiency, high sludge dryness, strong resistance to load changes, and convenient operation and maintenance.

[0004] However, both ion exchange and chemical softening methods require the addition of large amounts of resin or chemicals to improve hardening removal efficiency, which puts pressure on production costs. Furthermore, existing high-density sedimentation tanks used for hardening removal often suffer from low design loads, resulting in slow flocculation and sedimentation rates, thus failing to achieve rapid hardening removal.

[0005] Therefore, in the field of mine water hardening, developing efficient, low-cost, and rapid hardening removal technologies is crucial. Utility Model Content

[0006] The purpose of this invention is to solve the technical problems of high consumption and high cost of existing reagents. It improves upon the original magnetic coagulation sedimentation device by adding an intelligent dosing system. This system includes a controller connected to an inlet flow meter, an inlet water quality monitor, an effluent water quality monitor, an image acquisition device, and a reagent dosing pump. The controller precisely controls the dosage of the reagents based on the flow rate measured by the inlet flow meter, the calcium and magnesium ion content and pH value of the raw inlet water measured by the water quality monitor, the calcium and magnesium ion content and pH value of the effluent water measured by the effluent water quality monitor, and the floc image of the magnetic sedimentation unit measured by the image acquisition device. This achieves unmanned operation.

[0007] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0008] A rapid hardness removal system for mine water using magnetic coagulation and sedimentation includes a raw water inlet unit, a hardness removal unit, a magnetic coagulation unit, a magnetic sedimentation unit, a magnetic recovery unit, and a chemical dosing unit connected by pipelines; the chemical dosing unit includes:

[0009] The controller is installed on the control cabinet;

[0010] The inlet flow meter is connected to the controller and is used to monitor the flow rate of the pretreated mine water inlet in real time and feed it back to the controller.

[0011] The influent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value in the raw water influent, and feed it back to the controller.

[0012] The effluent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value of the effluent, and feed it back to the controller.

[0013] An image acquisition device, which is communicatively connected to the controller, is used to acquire images of alum flocs in the magnetic precipitation unit and feed the image results back to the controller.

[0014] The agent dosing pump is connected to the controller and is used to adjust the dosage of the agent based on the feedback of calcium and magnesium ion content, pH value and alum flower image results.

[0015] As a preferred technical solution:

[0016] Optionally, the inlet flow meter and the inlet water quality monitor are installed on the pipeline of the raw water inlet unit, and the inlet flow meter is installed in front of the inlet water quality monitor;

[0017] The effluent water quality monitoring instrument is installed on the effluent pipeline of the magnetic sedimentation unit;

[0018] The image acquisition device is installed above the magnetic precipitation unit;

[0019] One end of the reagent dosing pump is connected to the reagent storage tank, and the other end is connected to the hardening unit and the magnetic coagulation unit. It includes a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump, and a coagulant aid dosing pump, which are respectively connected to the controller.

[0020] Optionally, the raw water inlet unit includes a booster pump and an inlet pipe;

[0021] The hardening removal unit includes a non-powered pipeline mixer, a first baffle mixing zone, and a primary stirring hardening removal tank connected in sequence, wherein a powered mixer is installed in the primary stirring hardening removal tank;

[0022] The magnetic coagulation unit includes a second baffle mixing zone, a secondary stirred coagulation tank and a tertiary stirred flocculation tank connected in sequence, and a power stirrer is installed in the secondary stirred coagulation tank and the tertiary stirred flocculation tank.

[0023] The magnetic sedimentation unit includes an inclined tube sedimentation tank;

[0024] The magnetic recovery unit includes a high-speed deflocculator and a magnetic recovery machine; the sludge outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculator, the high-speed deflocculator sends the deflocculated magnetic sludge to the magnetic recovery machine, the magnetic recovery machine separates the magnetic powder and sludge, sends the separated magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit; the magnetic recovery machine is connected to the feed end of the magnetic powder dosing pump;

[0025] The reagent storage tanks include caustic soda storage tanks, soda ash storage tanks, oxalic acid storage tanks, coagulant storage tanks, magnetic powder storage tanks, and coagulant aid storage tanks; each reagent storage tank is equipped with a mixing agitator.

[0026] Optionally, the feed end of the caustic soda dosing pump is connected to the caustic soda storage tank via a pipeline, and the discharge end is connected to the non-powered pipeline mixer, for fully mixing mine water and caustic soda to remove magnesium ions from the mine water;

[0027] The feed end of the soda ash dosing pump is connected to the soda ash storage tank via a pipeline, and the discharge end is connected to the primary hardening removal mixing tank, which is used to fully mix mine water and soda ash to further remove calcium ions from the mine water.

[0028] The feed end of the oxalic acid dosing pump is connected to the oxalic acid storage tank via a pipeline, and the discharge end is connected to the mixing zone of the second baffle plate.

[0029] The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the secondary mixing coagulation tank, which is used to fully mix the added coagulant with the mine water after hardening treatment.

[0030] The feed end of the magnetic powder dosing pump is connected to the magnetic powder storage tank via a pipeline, and the discharge end is connected to the secondary stirred coagulation tank.

[0031] The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the three-stage stirred flocculation tank.

[0032] Optionally, the non-powered pipeline mixer refers to a mixer with multiple spiral structures inside, powered by the original booster pump, used for preliminary mixing of coagulant and mine water; the first baffle mixing zone is located in the flow channel of the primary mixing and hardening tank inlet, and the flow channel is equipped with baffles for non-powered baffle mixing; the second baffle mixing zone is located in the flow channel of the secondary mixing and coagulation tank inlet, and the flow channel is equipped with baffles for non-powered baffle mixing; the purpose of the first and second baffle mixing zones is to improve the turbulence of the water flow, making the turbulent movement in the mixing tank more intense, the mixing effect better, and conducive to the collision and adhesion of flocs and other particles, so as to further mix the added agent and mine water.

[0033] Optionally, it also includes a pH adjustment unit, located after the magnetic precipitation unit, including a pH adjustment reaction tank; the effluent quality monitor is installed on the effluent pipeline of the pH adjustment unit; the discharge end of the oxalic acid dosing pump is connected to the pH adjustment reaction tank; the purpose of adding a pH adjustment unit in this part of the present invention is to adjust the amount of oxalic acid added to a neutral pH value of 7-9 according to the intended use of the produced water. If it needs to be discharged into a river, a pH adjustment unit needs to be added here, and the oxalic acid dosing pump dosage is adjusted by the controller to adjust the dosage of oxalic acid to a neutral pH value of 7-9. If the produced water needs to enter the reverse osmosis membrane for further treatment, there is no need to add a pH adjustment unit here.

[0034] Optionally, the controller is a PLC controller, used to receive the calcium and magnesium ion content, pH value, and influent flow rate of the influent, the calcium and magnesium ion content, pH value, and effluent flow rate of the effluent, and the floc image of the magnetic sedimentation unit, and control the dosage of the caustic soda dosing pump, soda ash dosing pump, oxalic acid dosing pump, coagulant dosing pump, magnetic powder dosing pump, and coagulant aid dosing pump according to the results.

[0035] Optionally, the influent water quality monitor and the effluent water quality monitor are online calcium and magnesium ion monitors.

[0036] Compared with the prior art, the beneficial effects of this utility model are:

[0037] 1. The mine water magnetic coagulation sedimentation rapid hardening removal system of this utility model adopts an intelligent dosing system, that is, by setting up a controller and setting up an inlet flow meter, an inlet water quality monitor, an outlet water quality monitor, an image acquisition instrument and a chemical dosing pump that are connected to the controller for communication; the controller accurately controls the dosage of each chemical dosing pump required in the magnetic coagulation process based on the calcium and magnesium ion content and pH value measured by the inlet water quality monitor, the calcium and magnesium ion content and pH value measured by the outlet water quality monitor, and the floc image of the magnetic sedimentation unit measured by the image acquisition instrument, thereby realizing unmanned operation;

[0038] 2. The mine water magnetic coagulation sedimentation rapid hardening removal system of this utility model reduces the total hydraulic retention time (HRT) by more than 25% compared with the prior art, achieving the effect of rapid hardening removal;

[0039] 3. The mine water magnetic coagulation sedimentation rapid hardening removal system of this utility model saves more than 20% of the floor space of the equipment used.

[0040] 4. The mine water magnetic coagulation sedimentation rapid hardening removal system of this utility model makes mine water hardening removal more low-carbon, efficient, and environmentally friendly, and has a certain degree of flexibility and adaptability, which can meet the hardening removal technology needs of mine water with large differences in quality in different regions. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a system flowchart of this utility model;

[0043] Figure 2 This is a schematic diagram of the structure of the device used in the system of this utility model;

[0044] Figure 3 This is a structural diagram of the PLC controller feedback control system of this utility model;

[0045] Figure label:

[0046] 101-Inlet flow meter; 102-Inlet water quality monitor; 201-Non-powered pipeline mixer; 202-First baffle mixing zone; 203-Primary stirring hardening tank; 204-First powered agitator; 301-Second baffle mixing zone; 302-Secondary stirring coagulation tank; 303-Secondary powered agitator; 304-Guide cylinder; 305-Tertiary stirring flocculation tank; 306-Third powered agitator; 307-Connecting pipe; 401-Magnetic sedimentation zone; 402-Sedimentation tank inlet zone; 403-Sludge scraper; 404-Inclined tube sedimentation zone; 405-Inclined tube support Crossbeam; 406-Pressure sensor; 407-Outlet weir; 408-Outlet; 409-Magnetic mud reflux pump; 410-pH adjustment reactor; 411-Outlet flow meter; 412-Outlet water quality monitor; 413-Image acquisition instrument; 501-High-speed deflocculator; 502-Magnetic recovery machine; 601-NaOH dosing device; 602-Na2CO3 dosing device; 603-Coagulant dosing device; 604-Flocculant dosing device; 605-Oxalic acid dosing device; 606-Magnetic powder dosing device; 701-Control cabinet; 702-PLC controller. Detailed Implementation

[0047] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0048] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the system or component 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 utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a communication 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 specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0053] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0054] This utility model embodiment provides a rapid hardening removal system for mine water using magnetic coagulation sedimentation, including a raw water inlet unit, a hardening removal unit, a magnetic coagulation unit, a magnetic sedimentation unit, a magnetic recovery unit, and a chemical dosing unit connected by pipelines. Figure 1 As shown. Wherein:

[0055] The raw water inlet unit includes a booster pump and an inlet pipe;

[0056] The hardening removal unit includes a non-powered pipeline mixer, a first baffle plate mixing zone, and a primary stirring hardening removal tank connected in sequence. A powered agitator is installed in the primary stirring hardening removal tank. The non-powered pipeline mixer has multiple spiral structures inside and is powered by the original booster pump to initially mix caustic soda reagent and mine water. The first baffle plate mixing zone is located in the inlet channel of the primary stirring hardening removal tank. Baffles are installed in the channel for non-powered baffle mixing.

[0057] The magnetic coagulation unit includes a second baffle mixing zone, a secondary stirred coagulation tank, and a tertiary stirred flocculation tank connected in sequence; wherein the second baffle mixing zone is located in the inlet channel of the secondary stirred coagulation tank, and the channel is equipped with baffles for non-powered baffle mixing;

[0058] The magnetic sedimentation unit includes an inclined tube sedimentation tank;

[0059] The magnetic recovery unit includes a high-speed deflocculator and a magnetic recovery machine; the sludge outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculator. The high-speed deflocculator sends the deflocculated magnetic mud to the magnetic recovery machine. The magnetic recovery machine separates the magnetic powder and sludge, sends the magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit. The magnetic recovery machine is connected to the feed end of the magnetic powder dosing pump.

[0060] The dosing unit includes:

[0061] The controller is installed on the control cabinet;

[0062] The inlet flow meter is connected to the controller to monitor the flow rate of the pretreated mine water in real time and feed it back to the controller. The inlet flow meter is installed on the pipeline of the raw water inlet unit and is located in front of the inlet water quality monitor.

[0063] The influent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value in the raw water influent, and feed it back to the controller; the influent water quality monitor is installed on the pipeline of the raw water influent unit, and the influent flow meter is installed in front of the influent water quality monitor;

[0064] The effluent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value of the effluent, and feed back the data to the controller; the effluent water quality monitor is installed on the pipeline of the magnetic sedimentation unit effluent.

[0065] An image acquisition device, which communicates with the controller, is used to acquire images of alum flocs in the magnetic sedimentation unit and feed the image results back to the controller. The image acquisition device is installed above the magnetic sedimentation unit, specifically above the inclined tube sedimentation tank, to acquire images of the magnetic floc sedimentation in the sedimentation tank and transmit the images to the controller.

[0066] A reagent dosing pump, communicatively connected to the controller, is used to adjust the dosage of reagents based on feedback values ​​of calcium and magnesium ions, pH value, and flocculant image results. One end of the reagent dosing pump is connected to the reagent storage tank, and the other end is connected to the hardening unit and the magnetic coagulation unit, respectively. It includes a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump, and a coagulant aid dosing pump, each communicatively connected to the controller. Specifically, the reagent storage tank includes a caustic soda storage tank, a soda ash storage tank, an oxalic acid storage tank, a coagulant storage tank, a magnetic powder storage tank, and a coagulant aid storage tank, each equipped with a mixing agitator.

[0067] The specific settings for the dosing pump to achieve material dosing are as follows:

[0068] The feed end of the caustic soda dosing pump is connected to the caustic soda storage tank through a pipeline, and the discharge end is connected to the non-powered pipeline mixer, which is used to fully mix mine water and caustic soda to remove magnesium ions from the mine water.

[0069] The feed end of the soda ash dosing pump is connected to the soda ash storage tank through a pipeline, and the discharge end is connected to the primary hardening removal mixing tank. It is used to fully mix the mine water and soda ash to further remove calcium ions from the mine water.

[0070] The feed end of the oxalic acid dosing pump is connected to the oxalic acid storage tank through a pipeline, and the discharge end is connected to the mixing zone of the second baffle plate, which is used for acid-base neutralization after the hardening reaction;

[0071] The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the secondary mixing coagulation tank, which is used to fully mix the added coagulant with the mine water after hardening treatment.

[0072] The feed end of the magnetic powder dosing pump is connected to the magnetic powder storage tank via a pipeline, and the discharge end is connected to the secondary stirred coagulation tank; the feed end of the magnetic powder dosing pump is also connected to the magnetic recovery machine.

[0073] The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the three-stage stirred flocculation tank.

[0074] The mine water magnetic coagulation sedimentation rapid hardening removal system of this embodiment also includes a pH adjustment unit, which is set after the magnetic sedimentation unit and includes a pH adjustment reaction tank; the effluent water quality monitoring instrument is set on the pipeline of the effluent from the pH adjustment reaction tank; the discharge end of the oxalic acid dosing pump is also connected to the pH adjustment reaction tank.

[0075] In this embodiment, the controller is a PLC controller, used to receive the calcium and magnesium ion content, pH value, and influent flow rate of the influent, as well as the calcium and magnesium ion content, pH value, and effluent flow rate of the effluent, and the floc image from the magnetic sedimentation unit. Based on the results, it controls the dosage of the caustic soda, soda ash, oxalic acid, coagulant, magnetic powder, and coagulant aid pumps. The influent and effluent water quality monitoring instruments are online calcium and magnesium ion monitors.

[0076] A schematic diagram of the device used in the mine water magnetic coagulation sedimentation rapid hardening system of this utility model is shown below. Figure 2 As shown, the details are as follows:

[0077] (1) Raw water inlet unit

[0078] Raw water is pumped to the ground by a booster pump and enters the inlet pipe. An inlet flow meter 101 is installed on the inlet pipe (the signal line is connected to the controller 701 to transmit feedback monitoring signals). An inlet water quality monitor 102 is installed after the inlet flow meter 101 (the signal line is connected to the controller 701 to transmit feedback monitoring signals).

[0079] (2) Excluding hard units

[0080] The system includes, in sequence, a non-powered pipeline mixer 201 (with a NaOH dosing point for mixing), a hardening rapid mixing zone 202 (i.e., the first baffle mixing zone, where baffles are installed in the flow channel for non-powered baffle mixing, improving the turbulence of the water flow, resulting in more intense turbulence in the reactor, better mixing effect, and facilitating the collision and adhesion of floc particles for further mixing of NaOH and mine water), a primary stirring hardening tank 203, and a first powered agitator 204 (i.e., the hardening stirring zone, which uses a double-blade agitator to fully and evenly mix Na2CO3; the agitator motor signal line is connected to the controller 701 to control the start and stop of the agitator).

[0081] (3) High-efficiency magnetic concrete unit

[0082] Traditional coagulation mixing tanks consist of three stages: two-stage coagulation and one-stage flocculation, all using parallel paddle mixers with a mixing time of 6-10 minutes. This device, designed for mine water treatment where space is limited and equipment requires a small footprint, innovatively employs a high-efficiency coagulation mixing tank in two stages: one-stage coagulation (enhanced by a flow guide tube) and one-stage flocculation (differential mixing), with a coagulation time of 4.5-6 minutes and a smaller footprint. Compared to three-stage coagulation, the coagulation system reduces hydraulic retention time by over 25%, saves over 10% in space, reduces energy consumption by over 15%, and lowers equipment costs by over 5%. The structure includes a second baffle mixing zone 301 (with baffles in the flow channel, providing non-powered baffle mixing, improving the turbulence of the water flow, resulting in more intense turbulent movement within the reactor, better mixing effect, and facilitating the collision and adhesion of floc particles for further mixing of coagulant and mine water; designed residence time 20-40s), and a secondary stirred coagulation tank 302 (i.e., the coagulation zone, where magnetic powder and magnetic mud from the magnetic mud return pump 411 are added, and stirring is performed using a second-powered stirrer 303, which is a double-bladed mechanical stirrer with an internal guide tube 304. Under the mechanical stirring action, radial and axial flows can be formed within the guide tube, improving the turbulence of the water flow and reducing turbulence within the reactor). The movement is more intense, making maximum use of stirring energy to improve the coagulation effect, with a designed residence time of 90-120s. The three-stage stirring flocculation tank 305 (i.e., the flocculation zone) uses a third-power stirrer 306 for stirring. It is a multi-stage heterogeneous blade mechanical stirrer with large blades at the bottom and small blades at the top. Through the differential stirring of blades of different sizes at multiple stages, flocculation is carried out step by step. The stirring intensity at the bottom is high, and the number of collisions of floc particles is high. At the same time, it washes away the solid particles at the bottom and prevents the magnetic powder at the bottom from settling and caking due to gravity. The stirring intensity at the top is low to prevent the floc from breaking due to the same stirring intensity as the bottom, ensuring stable flocculated effluent, with a designed residence time of 180-240s. The connecting pipe 307 (connects the magnetic coagulation unit and the magnetic sedimentation unit, and is gravity-fed) is used.

[0083] (4) Magnetic precipitation unit

[0084] The radial flow square sedimentation tank adopts a "single-sided water inlet and peripheral water outlet" design, which improves sedimentation and sludge removal efficiency, increases the utilization rate of equipment tank space, and reduces equipment investment costs. Compared with high-density sedimentation tanks, the sedimentation efficiency is increased by 19% and the space utilization rate is increased by 22%. At the same time, the inclined tube vibration self-cleaning technology has been developed to solve the problem of manual cleaning, realize automated monitoring and cleaning, improve system operation stability, and reduce operation and maintenance difficulty and workload.

[0085] The system includes a magnetic sedimentation zone 401, a sedimentation tank inlet zone 402 (including a baffle; the inlet of the sedimentation tank adopts a submerged design, meaning the inlet liquid level is higher than the outlet to prevent water head drop from causing floc breakage and affecting the sedimentation effect; the flow velocity below the baffle is controlled at 0.02~0.03m / s; if the flow velocity is too low, flocs are prone to escape near the inlet; if the flow velocity is too high, flocs are prone to escape far from the inlet), and a sludge scraper 403 (to remove sludge settled at the bottom of the tank; the bottom scraper scrapes the sludge to the central sludge hopper; the scraper is made of aggregate). Polyurethane material: Offers higher strength, hardness, aging resistance, and wear resistance compared to rubber sheets. The scraper beam is made of rectangular steel pipe or channel steel: Offers higher strength than round steel, ensuring the scraper plate will not shift and improving deformation resistance. The inclined tube sedimentation zone is 404, the inclined tube support beam is 405 (channel steel or I-beam), and the pressure sensor is 406. (Traditional cleaning methods involve pre-buried pipes for automatic flushing or emptying the tank for manual flushing, both requiring system shutdown and resulting in low efficiency; this device uses a pressure sensor in the inclined tube sedimentation zone for pressure sensing.) The system includes: a device 406 and a controller 701 connected via a signal line for automated monitoring and cleaning, improving system stability and reducing maintenance difficulty and workload; an effluent weir 407; an effluent outlet 408; a magnetic mud return pump 409 (a positive displacement pump with good anti-clogging performance; even if the pipeline becomes blocked during operation, it can be cleared by reversing); a pH adjustment reaction tank 410 (i.e., a pipeline mixer connected to an oxalic acid dosing pump for acid-base neutralization reaction and pH adjustment; since alkali is added to the system, oxalic acid can be used to adjust the pH of the water according to actual conditions); an effluent flow meter 411 (with a signal line connected to the controller 701 to transmit feedback monitoring signals); an effluent water quality monitor 412 (with a signal line connected to the controller 701 to transmit feedback monitoring signals); and an image acquisition device 413 (i.e., a high-definition camera installed on the upper part of the magnetic sedimentation unit; using particle imaging method to intuitively evaluate the quality of floc sedimentation, i.e., real-time imaging of magnetic floc sedimentation).

[0086] (5) Magnetic recycling unit

[0087] It includes a high-speed deflocculator 501 (with a high-speed dispersing wheel at the center, which uses the rapid rotation of the high-speed dispersing wheel to shear the sludge flocs containing magnetic powder, thereby separating the magnetic powder and sludge; through the high-speed rotating cutter disc and the unique water flow channel design, the magnetic floc sludge is dispersed into magnetic powder and non-magnetic sludge) and a magnetic recovery machine 502 (used to recover the magnetic powder deflocculated by 501).

[0088] (6) Dosing unit and intelligent control

[0089] The six dosing devices are: NaOH dosing device 601, Na2CO3 dosing device 602, coagulant dosing device 603, flocculant dosing device 604, oxalic acid dosing device 605 (dosing inlets are located at the second baffle mixing zone 301 and the pH adjustment reaction tank 410. Dosing in the second baffle mixing zone 301 is necessary because pH > 10 affects coagulation and sedimentation effects and floc size, thus requiring pH adjustment to < 10; dosing in the pH adjustment reaction tank 410 is necessary depending on the intended use of the permeate: if the permeate is discharged into a river, oxalic acid needs to be added to adjust it to a neutral pH of 7-9; if it enters a reverse osmosis membrane for further treatment, no oxalic acid adjustment is required), and magnetic powder dosing device 606. Each of the six dosing devices includes a variable frequency chemical dosing pump, a chemical storage tank, and a mixer.

[0090] The control cabinet 701 and PLC controller 702 (receive feedback data on influent flow rate, influent and effluent calcium and magnesium ions, and pH value, then calculate the dosage according to the algorithm, and feed it back to each chemical dosing pump, and adjust the dosage by frequency conversion to achieve intelligent and precise dosing) are connected to online water quality monitoring instruments, high-definition cameras, high-efficiency coagulation units, magnetic sedimentation units, magnetic recovery units, and chemical dosing units; a one-button start / stop function is set up to realize one-button start and stop.

[0091] The PLC controller can perform intelligent dosing based on feedback from the influent and effluent water quality (control is mainly based on calcium and magnesium ions and pH, meaning the dosage can be set according to the calcium and magnesium ion content and pH value; for example, when the magnetic powder dosage is 2-4 times the influent water (2.5 × calcium ion content + 2.4 × magnesium ion content), the hardness removal effect is better; when the caustic soda dosage is 4-5 times the magnesium ion content of the influent water, the magnesium ion removal effect is better; when the soda ash dosage is 3-4 times the calcium ion content of the influent water, the calcium ion removal effect is better). The structure of the PLC controller feedback control system is as follows: Figure 3 As shown.

[0092] The mine water magnetic coagulation sedimentation rapid hardening system of this invention is used for hardening of raw mine water, with a treatment capacity of 3600 m³. 3 / d. The average total salt content of the raw water influent is approximately 4013 mg / L, and the sulfate content (as SO42-) is approximately 4013 mg / L. 2- (Calculated) ≈2068mg / L, Ca 2+ Concentration ≈ 349.3 mg / L, Mg 2+ Concentration ≈ 132.6 mg / L; Average Ca in product water 2+ Concentration ≈ 16.9 mg / L, Mg 2+ The concentration is approximately 31.4 mg / L, which translates to a total hardness of approximately 173.1 mg / L. This meets the hardness requirement for the RO membrane feed water (generally less than 250 mg / L), indicating excellent hardness removal performance.

[0093] The mine water magnetic coagulation sedimentation rapid hardening system of this invention is used for hardening of raw mine water. The main equipment occupies an area of ​​approximately 79 m². 2 / (ten thousand m) 3 ·d -1 The total hydraulic retention time (HRT) is approximately 15 minutes, and the design load for magnetic coagulation sedimentation is 15–40 m³. 3 / (m 2 The settling velocity is 15-40 m / h; while existing technologies often use high-density sedimentation to remove hardness from mine water, the main equipment of which occupies an area of ​​approximately 100 m². 2 / (ten thousand m) 3 ·d -1 The total hydraulic retention time (HRT) is approximately 20 minutes, and the design load is 0.6~1.0 m. 3 / (m 2 The settling velocity is 0.6~1.0 m / h. Therefore, the magnetic sedimentation tank of this invention saves more than 20% of the floor space, shortens the total hydraulic retention time (HRT) by more than 25%, increases the settling velocity by more than 15 times, and greatly improves the efficiency of deep hardening removal, thus achieving rapid hardening removal.

Claims

1. A rapid hardening removal system for mine water magnetic coagulation sedimentation, characterized in that: It includes a raw water inlet unit, a hardness removal unit, a magnetic coagulation unit, a magnetic sedimentation unit, a magnetic recovery unit, and a chemical dosing unit connected by pipelines; the chemical dosing unit includes: The controller is installed on the control cabinet; The inlet flow meter is connected to the controller and is used to monitor the flow rate of the pretreated mine water inlet in real time and feed it back to the controller. The influent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value in the raw water influent, and feed it back to the controller. The effluent water quality monitor is connected to the controller and is used to monitor the calcium and magnesium ion content and pH value of the effluent, and feed it back to the controller. An image acquisition device, which is connected to the controller, is used to acquire images of alum flocs during magnetic floc sedimentation and to feed the image results back to the controller. The agent dosing pump is connected to the controller and is used to adjust the dosage of the agent based on the feedback of calcium and magnesium ion content, pH value and alum flower image results.

2. The mine water magnetic coagulation sedimentation rapid hardening removal system according to claim 1, characterized in that, The inlet flow meter and the inlet water quality monitor are installed on the pipeline of the raw water inlet unit, and the inlet flow meter is installed in front of the inlet water quality monitor; The effluent water quality monitoring instrument is installed on the effluent pipeline of the magnetic sedimentation unit; The image acquisition device is installed above the magnetic precipitation unit; One end of the reagent dosing pump is connected to the reagent storage tank, and the other end is connected to the hardening unit and the magnetic coagulation unit respectively. It includes a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump, which are respectively connected to the controller.

3. The mine water magnetic coagulation sedimentation rapid hardening removal system according to claim 2, characterized in that: The raw water inlet unit includes a booster pump and an inlet pipe; The hardening removal unit includes a non-powered pipeline mixer, a first baffle mixing zone, and a primary stirring hardening removal tank connected in sequence, wherein a powered mixer is installed in the primary stirring hardening removal tank; The magnetic coagulation unit includes a second baffle mixing zone, a secondary stirred coagulation tank and a tertiary stirred flocculation tank connected in sequence, and a power stirrer is installed in the secondary stirred coagulation tank and the tertiary stirred flocculation tank. The magnetic sedimentation unit includes an inclined tube sedimentation tank; The magnetic recovery unit includes a high-speed deflocculator and a magnetic recovery machine; the sludge outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculator, the high-speed deflocculator transports the deflocculated magnetic sludge to the magnetic recovery machine, the magnetic recovery machine separates the magnetic powder and sludge, sends the magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit; the magnetic recovery machine is connected to the feed end of the magnetic powder dosing pump; The reagent storage tanks include caustic soda storage tanks, soda ash storage tanks, oxalic acid storage tanks, coagulant storage tanks, magnetic powder storage tanks, and coagulant aid storage tanks; each reagent storage tank is equipped with a mixing agitator.

4. The mine water magnetic coagulation sedimentation rapid hardening removal system according to claim 3, characterized in that: The feed end of the caustic soda dosing pump is connected to the caustic soda storage tank via a pipeline, and the discharge end is connected to the non-powered pipeline mixer, which is used to fully mix mine water and caustic soda to remove magnesium ions from the mine water. The feed end of the soda ash dosing pump is connected to the soda ash storage tank via a pipeline, and the discharge end is connected to the primary hardening removal mixing tank, which is used to fully mix mine water and soda ash to further remove calcium ions from the mine water. The feed end of the oxalic acid dosing pump is connected to the oxalic acid storage tank via a pipeline, and the discharge end is connected to the mixing zone of the second baffle plate, which is used to neutralize the acid-base balance of the water. The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the secondary mixing coagulation tank, which is used to fully mix the added coagulant with the mine water after hardening treatment. The feed end of the magnetic powder dosing pump is connected to the magnetic powder storage tank via a pipeline, and the discharge end is connected to the secondary stirred coagulation tank. The feed end of the coagulant dosing pump is connected to the coagulant storage tank via a pipeline, and the discharge end is connected to the three-stage stirred flocculation tank.

5. A rapid hardening removal system for mine water magnetic coagulation sedimentation according to claim 3, characterized in that: The non-powered pipeline mixer refers to a mixer with multiple spiral structures inside, powered by the original booster pump, used for preliminary mixing of caustic soda reagent and mine water; the first baffle mixing zone is located in the flow channel of the primary stirring and hardening tank inlet, and the flow channel is equipped with baffles for non-powered baffle mixing; the second baffle mixing zone is located in the flow channel of the secondary stirring and coagulation tank inlet, and the flow channel is equipped with baffles for non-powered baffle mixing.

6. A rapid hardening removal system for mine water magnetic coagulation sedimentation according to claim 2, characterized in that: It also includes a pH adjustment unit, which is located after the magnetic precipitation unit and includes a pH adjustment reaction tank; the effluent water quality monitor is installed on the effluent pipeline of the pH adjustment unit; and the discharge end of the oxalic acid dosing pump is connected to the pH adjustment reaction tank.

7. A rapid hardening removal system for mine water magnetic coagulation sedimentation according to claim 6, characterized in that: The controller is a PLC controller, used to receive the calcium and magnesium ion content, pH value, and influent flow rate of the influent, the calcium and magnesium ion content, pH value, and effluent flow rate of the effluent, as well as the floc image of the magnetic sedimentation unit, and control the dosage of the caustic soda dosing pump, soda ash dosing pump, oxalic acid dosing pump, coagulant dosing pump, magnetic powder dosing pump, and coagulant aid dosing pump according to the results.

8. The mine water magnetic coagulation sedimentation rapid hardening removal system according to claim 1, characterized in that: The influent water quality monitoring instrument and the effluent water quality monitoring instrument are both online calcium and magnesium ion monitoring instruments.

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