Metallic ore beneficiation wastewater processing method and device

Abstract

The invention provides a metal ore beneficiation wastewater processing treatment method and device, and relates to the technical field of wastewater treatment. The metal ore beneficiation wastewater processing treatment method comprises the following steps: S1, rapid oxidation treatment: in a first stage, adding 60% of calcium hypochlorite and phosphate into wastewater, and stirring to generate first-stage wastewater; step S2, deep oxidation treatment: in the second stage, adding 40% of the total amount of calcium hypochlorite into the first-stage wastewater, and stirring to generate second-stage wastewater. The wastewater pretreatment device is used for the first stage of wastewater treatment in the metal ore beneficiation wastewater processing treatment method. According to the scheme, efficient oxidation of ammonia nitrogen is achieved through two-stage calcium hypochlorite adding, hydroxyapatite is generated through Ca < 2 + > and PO4 < 3 + > to fix heavy metal, residual chemicals are controlled synchronously, and it is ensured that treated water can be directly reused in the flotation process.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method and apparatus for processing and treating wastewater from metal ore beneficiation. Background Technology

[0002] Mineral processing wastewater contains a large amount of harmful substances and generally cannot be directly recycled. If mineral processing wastewater is discharged into rivers, lakes and other water bodies, it will cause water acidification, destroy the growth environment of bacteria and microorganisms, reduce the self-purification function of water bodies, and the heavy metals in mineral processing wastewater are non-biodegradable and difficult to remove from the environment. Therefore, it is necessary to purify the wastewater after mineral processing.

[0003] Currently, due to the high ammonia nitrogen concentration in mineral processing wastewater, sodium hypochlorite is often used for oxidation treatment; however, residual Cl- remains in the tailings after oxidation treatment. - The concentration far exceeds the standard for reuse, and reuse can easily cause corrosion to flotation equipment. Furthermore, oxidation byproducts can inhibit the activity of flotation reagents. Therefore, how to ensure the safety and reliability of wastewater reuse while achieving wastewater treatment requires further research.

[0004] Therefore, it is necessary to provide a method for processing and treating wastewater from metal ore beneficiation to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for processing and treating wastewater from metal ore beneficiation, which solves the problem in related technologies of how to ensure the safe and reliable reuse of wastewater while achieving wastewater treatment.

[0006] To solve the above-mentioned technical problems, the method for processing and treating metal ore beneficiation wastewater provided by the present invention includes the following steps: Step S1, rapid oxidation treatment: In the first stage, 60% of the total amount of calcium hypochlorite and phosphate are added to the wastewater and stirred to generate first-stage wastewater. Step S2, deep oxidation treatment: In the second stage, 40% of the total amount of calcium hypochlorite is added to the wastewater from the first stage and stirred to generate wastewater from the second stage. Step S3, pH adjustment: Dilute sulfuric acid is added to the wastewater of the second stage to adjust the pH and generate tailings. Step S4: Residual chlorine removal; sodium sulfite is added to the tail liquid to neutralize residual ClO. - .

[0007] Preferably, the phosphate is Na2HPO4, according to PO4 3- Heavy metals: 1.0-1.2:1 dosage.

[0008] Preferably, in step S1, calcium hypochlorite is added to adjust the pH of the wastewater to 8.5-9.0.

[0009] Preferably, the stirring speed in step S1 is 200 rpm and the stirring time is 20 min.

[0010] Preferably, in step S2, calcium hypochlorite is added to adjust the pH of the first-stage wastewater to 9.0-9.5.

[0011] Preferably, the stirring speed in step S2 is 50 rpm and the stirring time is 30 min.

[0012] Preferably, in step S3, the pH is adjusted to 7.0-7.5 to avoid alkaline water corroding the flotation equipment.

[0013] Preferably, in step S4, the molar ratio of sodium sulfite to residual chlorine is 1:1.

[0014] The present invention also provides a wastewater pretreatment device for the first stage of wastewater treatment in the aforementioned metal ore beneficiation wastewater processing and treatment method, the wastewater pretreatment device comprising: Install rack; Two pretreatment tanks are fixedly mounted on the top of the mounting frame, and each pretreatment tank is equipped with an inlet pipe, a feed pipe and a discharge pipe; The switching mechanism includes a connecting pipe, a first driving component, and a switch cylinder. The two sides of the connecting pipe are fixedly connected to the two inlet pipes. The fixing part of the first driving component is fixedly disposed at one end of the connecting pipe. The driving part of the first driving component passes through the connecting pipe and is fixedly connected to the switch cylinder. The outer surface of the switch cylinder is rotatably connected to the inner surface of the connecting pipe. The switch cylinder has a switch port, and the input ends of the two inlet pipes are connected to the rotation range of the switch port. A liquid supply pipe, the output end of which is fixed to the bottom of the connecting pipe fitting, and the output end of which is offset from the rotation range of the switch cylinder; A mixing mechanism, which is mounted on the pretreatment tank; When the switch port is connected to one of the liquid inlet pipes, the output end of the liquid supply pipe is connected to one of the liquid inlet pipes through the connecting pipe and the switch cylinder, and the liquid is supplied without stopping through the open switch cylinder.

[0015] Preferably, the wastewater pretreatment device further includes a safety mechanism, which includes a connecting pipe, an elastic support, and a safety piston. The bottom of the connecting pipe is fixed to the top of the connecting pipe, and the rotation range of the connecting pipe and the switch cylinder is offset. The fixed part of the elastic support is fixed to the top of the connecting pipe, and the telescopic part of the elastic support is fixedly connected to the safety piston. The safety piston slides and seals with the connecting pipe.

[0016] Compared with related technologies, the method for treating metal ore beneficiation wastewater provided by this invention has the following beneficial effects: Ammonia nitrogen is efficiently oxidized through a two-stage calcium hypochlorite addition process, and Ca is utilized. 2+ With PO4 3+ Hydroxyapatite is generated to fix heavy metals, and residual reagents are controlled simultaneously to ensure that the treated water can be directly reused in the flotation process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A three-dimensional view of a first embodiment of the wastewater pretreatment device provided by the present invention; Figure 2 for Figure 1 A top view of the horizontal cross-section of the connecting pipe fitting shown; Figure 3 for Figure 1 A schematic diagram of the vertical cross-section of the connecting pipe fitting shown; Figure 4 for Figure 1 The diagram shows the structure of the AA cross section; Figure 5 A three-dimensional view of a second embodiment of the wastewater pretreatment device provided by the present invention; Figure 6 for Figure 5 A schematic cross-sectional view of the feeding mechanism shown. Figure 7 A three-dimensional diagram of a third embodiment of the wastewater pretreatment device provided by the present invention; Figure 8 for Figure 7 The diagram shows the connection structure of the second telescopic component; Figure 9 for Figure 7The diagram shown illustrates the synchronous adjustment principle of the second telescopic component. Figure 9 (a) in the diagram is a structural schematic of the transmission frame located on the left side of the box. Figure 9 (b) is a structural diagram of the transmission frame state switching process. Figure 9 (c) in the diagram is a structural schematic of the transmission frame located on the right side of the box.

[0019] Explanation of icon numbers: 1. Install the rack; 2. Pretreatment tank; 21. Inlet pipe; 22. Feeding pipe; 23. Discharge pipe; 3. Switching mechanism; 31. Connecting pipe fitting; 32. First driving component; 33. Switch cylinder; 331. Switch port; 34. Rotary disc; 35. Connecting rod; 4. Liquid supply pipe; 5. Safety mechanism; 51. Connecting pipe; 52. Elastic support; 53. Safety piston; 54. Pressure sensor; 6. Mixing mechanism; 61. Second driving component; 62. Drive shaft; 621. Mounting cavity; 622. Sliding hole; 63. Stirring rod; 64. Cleaning component; 641. First telescopic component; 642. Sliding shaft; 643. Scraper; 7. Filter components; 8. Feeding mechanism; 81. Box body; 811. Transmission hole; 82. Feeding pipe; 83. Second telescopic component; 831. Connecting slide rod; 832. Transmission frame; 833. Transmission crank; 84. Piston component.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a method for processing and treating wastewater from metal ore beneficiation.

[0023] In one embodiment of the present invention, the method for treating wastewater from metal ore beneficiation includes the following steps: Step S1, rapid oxidation treatment: In the first stage, 60% of the total amount of calcium hypochlorite and phosphate are added to the wastewater and stirred to generate first-stage wastewater. Step S2, deep oxidation treatment: In the second stage, 40% of the total amount of calcium hypochlorite is added to the wastewater from the first stage and stirred to generate wastewater from the second stage. Step S3, pH adjustment: Dilute sulfuric acid is added to the wastewater of the second stage to adjust the pH and generate tailings. Step S4: Residual chlorine removal; sodium sulfite is added to the tail liquid to neutralize residual ClO. - .

[0024] The total amount of calcium chlorate refers to the total amount of calcium chlorate required for one process.

[0025] Furthermore, the phosphate is Na2HPO4, according to PO4 3- Heavy metals: 1.0-1.2:1 dosage.

[0026] Furthermore, in step S1, calcium hypochlorite is added to adjust the pH of the wastewater to 8.5-9.0.

[0027] Furthermore, in step S1, the stirring speed is 200 rpm and the stirring time is 20 min.

[0028] Furthermore, in step S2, calcium hypochlorite is added to adjust the pH of the first-stage wastewater to 9.0-9.5.

[0029] Furthermore, in step S2, the stirring speed is 50 rpm and the stirring time is 30 min.

[0030] Furthermore, in step S3, the pH is adjusted to 7.0-7.5 to prevent alkaline water from corroding the flotation equipment.

[0031] Furthermore, in step S4, the molar ratio of sodium sulfite to residual chlorine is 1:1 to neutralize residual ClO. - Ensure Cl - ≤50mg / L.

[0032] Ammonia nitrogen was efficiently oxidized (NH3-N≤5mg / L) through a two-stage calcium hypochlorite addition process, and Ca was utilized. 2+ With PO4 3+ Hydroxyapatite (HAP) is generated to fix heavy metals (concentration ≤0.5 mg / L), while simultaneously controlling residual reagents (Cl). - ≤50mg / L, PO4 3- (≤5mg / L), ensuring that the treated water can be directly reused in the flotation process. Example 1:

[0033] Treatment of high ammonia nitrogen lead-zinc mine wastewater: Raw water quality: NH 3- N 800 mg / L, Pb2+ 100mg / L, Zn 2+ 150 mg / L, pH 6.5.

[0034] Processing flow: Calcium hypochlorite addition: Total dosage: 4.2 g / L (ClO) - NH 3- N=5:1), divided into two stages (60%+40%).

[0035] After the first phase, NH 3- N decreased to 120 mg / L, and reached 4.5 mg / L after the second phase.

[0036] Phosphate precipitation: Add 1.2 g / L Na₂HPO₄ (PO₄) 3- : Heavy metals = 1.2:1), Pb in effluent 2+ 0.3 mg / L, Zn 2+ 0.4 mg / L.

[0037] Water quality optimization: pH adjusted to 7.2, Cl - 45 mg / L, PO4 3- 4.8 mg / L.

[0038] Reuse effect: The lead recovery rate by flotation increased by 2.8%, and the equipment was free from corrosion. Example 2:

[0039] Treatment of medium-concentration copper mine wastewater: Raw water quality: NH 3- N 500 mg / L, Cu 2+ 120 mg / L, pH 6.8.

[0040] Processing flow: Calcium hypochlorite dosage: Total dosage 2.8 g / L (ClO) - NH 3- (N=4.5:1), added in stages.

[0041] After the first phase, NH 3- N75mg / L, reaching 3.2mg / L after the second phase.

[0042] Phosphate precipitation: Add 0.9 g / L Na₂HPO₄ (PO₄) 3- Cu 2+ =1.1:1), effluent Cu 2+ 0.2 mg / L.

[0043] Water quality optimization: pH 7.0, Cl - 38 mg / L, PO4 3-3.9 mg / L.

[0044] Recycling effect: The grade of copper concentrate increased from 22% to 23.5%. Example 3:

[0045] Treatment of low ammonia nitrogen and heavy metal wastewater: Raw water quality: NH 3- N 300 mg / L, Cu 2+ 80 mg / L, Zn 2+ 60 mg / L, pH 7.0.

[0046] Processing flow: Calcium hypochlorite dosage: Total dosage 1.7 g / L (ClO) - NH 3- N=4.2:1), two-stage addition.

[0047] After the first phase, NH 3- N45 mg / L, which reached 2.1 mg / L after the second phase.

[0048] Phosphate precipitation: Add 0.6 g / L Na₂HPO₄ (PO₄) 3- Heavy metals ratio = 1.0:1), Cu in effluent 2+ 0.1 mg / L, Zn 2+ 0.08 mg / L.

[0049] Water quality optimization: pH 7.3, Cl - 28 mg / L, PO4 3- 2.5 mg / L.

[0050] Reuse effect: The amount of flotation reagent used is reduced by 15%.

[0051] The present invention also provides a wastewater pretreatment device for the first stage of wastewater treatment in the metal ore beneficiation wastewater processing and treatment method described in the above embodiments.

[0052] First embodiment: Please refer to the following: Figures 1 to 4 In the first embodiment of the present invention, the wastewater pretreatment device includes: Mounting rack 1; Two pretreatment tanks 2 are fixedly mounted on the top of the mounting frame 1. Each pretreatment tank 2 is equipped with an inlet pipe 21, a feed pipe 22 and a discharge pipe 23. The switching mechanism 3 includes a connecting pipe 31, a first driving member 32, and a switch cylinder 33. The two sides of the connecting pipe 31 are fixedly connected to the two inlet pipes 21. The fixing part of the first driving member 32 is fixedly disposed at one end of the connecting pipe 31. The driving part of the first driving member 32 passes through the connecting pipe 31 and is fixedly connected to the switch cylinder 33. The outer surface of the switch cylinder 33 is rotatably connected to the inner surface of the connecting pipe 31. The switch cylinder 33 has a switch port 331, and the input ends of the two inlet pipes 21 are connected to the rotation range of the switch port 331. Liquid supply pipe 4, the output end of the liquid supply pipe 4 is fixed to the bottom of the connecting pipe 31, and the output end of the liquid supply pipe 4 is offset from the rotation range of the switch cylinder 33; A mixing mechanism 6 is installed on the pretreatment tank 2; When the switch port 331 is connected to the inlet pipe 21, the output end of the supply pipe 4 is connected to the inlet pipe 21 through the connecting pipe 31 and the switch cylinder 33, and the liquid is supplied without stopping through the open switch cylinder 33.

[0053] In this embodiment, both pretreatment tanks 2 are used for the first stage of wastewater treatment; The discharge pipe 23 is equipped with an independent control valve structure for discharging the wastewater after treatment in the pretreatment tank 2 to the next process.

[0054] The first driving component 32 adopts a motor structure to provide power for the rotational adjustment of the switch cylinder 33, so as to facilitate the rotational switching of the conveying direction of the switch port 331; like Figure 2 As shown, the switch port 331 is connected to one of the liquid inlet pipes 21, and the other liquid inlet pipe 21 is closed, so that the liquid supply pipe 4 can connect the wastewater through the open switch port 331 toward one of the liquid inlet pipes 21. Similarly, when the switch port 331 is connected to another liquid inlet pipe 21, one liquid inlet pipe 21 is closed, so that the liquid supply pipe 4 can connect the wastewater to the other liquid inlet pipe 21 through the open switch port 331. This is to meet the requirement of sequentially injecting wastewater into the two pretreatment tanks 2, and to avoid frequent start-stop of the liquid supply pipe 4.

[0055] The mixing mechanism 6 is used to stir and mix the wastewater input into the pretreatment tank 2, providing support for stirring and mixing.

[0056] In this embodiment, the time required for adding wastewater to the pretreatment tank 2 to the preset dosage is 30 minutes, the time required for stirring the wastewater in the pretreatment tank 2 is 20 minutes, and the time required for discharging the wastewater from the pretreatment tank 2 is 10 minutes.

[0057] When the supply pipe 4 continuously injects wastewater into the interior of one of the pretreatment tanks 2, the wastewater that has been injected into the interior of the other pretreatment tank 2 can be stirred and treated simultaneously, and then discharged after the stirring and treatment is completed. While the wastewater in one pretreatment tank 2 is being added, the wastewater in the other pretreatment tank 2 is being stirred, treated, and completely discharged. The first driving component 32 is activated, which drives the switch cylinder 33 to rotate. The switch cylinder 33 drives the switch port 331 to rotate, controlling the switch port 331 to connect with the liquid inlet pipe 21 of the other pretreatment tank 2, while the other liquid inlet pipe 21 is closed. Without needing to close the liquid supply pipe 4, the conveying direction of the switch port 331 is switched to achieve continuous and uninterrupted conveying, stirring, and discharge of wastewater, reducing the downtime waiting time of the wastewater input pipeline.

[0058] In this embodiment, the feed pipe 22 is used to add phosphate solution into the pretreatment tank 2, and calcium hypochlorite is added directly through the top of the pretreatment tank 2.

[0059] Please refer to the following: Figure 1 and Figure 3 The wastewater pretreatment device also includes a safety mechanism 5, which includes a connecting pipe 51, an elastic support 52, and a safety piston 53. The bottom of the connecting pipe 51 is fixed to the top of the connecting pipe 31. The rotation range of the connecting pipe 51 and the switch cylinder 33 is offset. The fixed part of the elastic support 52 is fixed to the top of the connecting pipe 51. The telescopic part of the elastic support 52 is fixedly connected to the safety piston 53. The safety piston 53 and the connecting pipe 51 are slidably sealed.

[0060] like Figure 1 As shown, in this embodiment, the top of the connecting pipe 51 is provided with an opening to ensure the stability of the safety piston 53 when it moves up and down.

[0061] The elastic support 52 provides elastic support for the safety piston 53. When the switch cylinder 33 is opened, the water pressure inside the connecting pipe 31 is normal, and the safety piston 53 is located at the bottom of the connecting pipe 51. When the switch cylinder 33 is switching directions, and the switch port 331 is closed, the water pressure inside the connecting pipe 31 increases, and the safety piston 53 slides upward under pressure.

[0062] By adding a connecting pipe 51 to the connecting pipe 31, when the switch cylinder 33 rotates and closes, the wastewater continuously input into the connecting pipe 31 can squeeze the safety piston 53. The safety piston 53 moves upward and compresses the elastic support 52, which facilitates buffering the water pressure inside the connecting pipe 31 without stopping the liquid supply pipe 4, and avoids the phenomenon of high pressure pipe bursting.

[0063] Furthermore, the safety mechanism 5 also includes a pressure sensor 54, which is fixed inside the connecting pipe 51 and aligned with the contraction range of the safety piston 53.

[0064] The pressure sensor 54 can be used to detect whether the safety piston 53 has risen to the warning point, thereby determining whether the pressure of the wastewater transported in the connecting pipe 31 has increased, so as to facilitate the safe detection of water pressure in the wastewater transport pipeline.

[0065] In an optional embodiment of this example, the liquid supply pipe 4 is connected to a wastewater transfer pump, and the pressure sensor 54 is signal-connected to the wastewater transfer pump. When the pressure sensor 54 detects a pressure signal, the wastewater transfer pump automatically shuts down and stops supplying water. When the pressure sensor 54 detects no pressure signal, the wastewater transfer pump remains running to continuously supply water.

[0066] Please refer to the following: Figure 1 and Figure 4 The mixing mechanism 6 includes a second driving member 61, a driving shaft 62, a stirring rod 63, and a cleaning member 64. The fixing part of the second driving member 61 is fixedly disposed at the bottom of the pretreatment tank 2. The driving part of the second driving member 61 passes through the bottom of the pretreatment tank 2 and is fixedly connected to the driving shaft 62. The stirring rod 63 is fixedly disposed on the driving shaft 62. The cleaning member 64 is installed at the bottom of the driving shaft 62, and the bottom of the cleaning member 64 abuts against the bottom of the inner wall of the pretreatment tank 2.

[0067] The second driving component 61 is a motor structure, which is fixedly installed at the bottom of the pretreatment tank 2 to provide power for the rotation adjustment of the drive shaft 62, so as to drive the stirring rod 63 to stir and mix the solution injected into the pretreatment tank 2.

[0068] When it is necessary to stir and mix the solution inside the pretreatment tank 2, the second drive unit 61 is activated. The second drive unit 61 drives the drive shaft 62 to rotate, and the drive shaft 62 drives the stirring rod 63 to rotate. The stirring rod 63 stirs and mixes the solution inside the pretreatment tank 2.

[0069] Please refer to it again. Figure 4 The drive shaft 62 has an interconnected mounting cavity 621 and a sliding hole 622. The cleaning component 64 includes a first telescopic component 641, a sliding shaft 642, and a scraper 643. The sliding shaft 642 is slidably mounted on the drive shaft 62 through the mounting cavity 621. The sliding shaft 642 covers the area of ​​the sliding hole 622. The two ends of the first telescopic component 641 are fixedly connected to the drive shaft 62 and the sliding shaft 642. One end of the scraper 643 passes through the sliding hole 622 and is fixedly connected to the sliding shaft 642.

[0070] In this embodiment, the extension range of the sliding shaft 642 is aligned with the range of the sliding hole 622, and the sliding seal between the sliding shaft 642 and the drive shaft 62 is maintained while ensuring that the sliding shaft 642 is connected to the scraper 643.

[0071] The first telescopic member 641 is an electric telescopic rod that provides power for the lifting and lowering adjustment of the sliding shaft 642 and the scraper 643.

[0072] By installing the liftable scraper 643 on the drive shaft 62, when the scraper 643 is adjusted upward and retracted, the scraper 643 is separated from the inner wall of the pretreatment tank 2, reducing contact when cleaning is not required and extending the service life of the equipment. When the scraper 643 is adjusted downward and comes into contact with the pretreatment tank 2, the scraper 643 rotates along the bottom of the inner wall of the pretreatment tank 2 to clean the internal sediment, so that the sediment can be stably discharged with the water flow when the pretreatment tank 2 is drained.

[0073] Furthermore, the wastewater pretreatment device also includes a filter element 7, which is installed on the discharge pipe 23.

[0074] In this embodiment, the filter element 7 is a plate filter used to filter the wastewater passing through the discharge pipe 23 to remove sediment particles from the wastewater.

[0075] By adding the filter element 7 at the output end of the discharge pipe 23, the wastewater after the first stage of treatment is filtered, thereby reducing the sediment in the wastewater entering the second stage of treatment and ensuring the quality of continuous wastewater treatment.

[0076] The working principle of the wastewater pretreatment device provided in this embodiment is as follows: When using the equipment, the switch port 331 is connected to the liquid inlet pipe 21 in advance, and the liquid supply pipe 4 is opened to continuously inject the wastewater to be treated into the pretreatment tank 2. After sufficient wastewater is injected into the pretreatment tank 2, calcium hypochlorite is added into the pretreatment tank 2 on one hand, and calcium hypochlorite solution is added through the feed pipe 22 on the other hand. The second drive unit 61 is then activated, which drives the drive shaft 62 to rotate. The drive shaft 62 drives the stirring rod 63 to rotate, stirring and mixing the wastewater until a preset stirring cycle is reached. After the stirring cycle is completed, the discharge pipe 23 is opened to transport the wastewater inside the pretreatment tank 2 to the next process, providing support for the continuous treatment of the first stage of wastewater. When the wastewater is injected into the pretreatment tank 2, the first drive unit 32 is started. The first drive unit 32 drives the switch cylinder 33 to rotate, and the switch cylinder 33 drives the switch port 331 to rotate, thereby switching and adjusting the conveying direction of the switch port 331 so that the switch port 331 is connected to another liquid inlet pipe 21 for continuous liquid supply to the liquid supply pipe 4. During the rotation of the switch port 331, when the switch port 331 completely blocks the coverage area of ​​the connecting pipe 31, the wastewater continuously injected into the connecting pipe 31 by the liquid supply pipe 4 pushes the safety piston 53 upward. The safety piston 53 adaptively contracts to maintain a constant water pressure inside the connecting pipe 31, thus preventing an accident of pipe bursting due to increased water pressure.

[0077] Second embodiment: Please refer to the following: Figures 5 to 6 Based on the wastewater pretreatment device provided in the first embodiment of the present invention, the second embodiment of the present invention proposes another wastewater pretreatment device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0078] Specifically, the wastewater pretreatment device provided in the second embodiment of the present invention differs in that the wastewater pretreatment device further includes a feeding mechanism 8, which includes a box body 81, two extraction pipes 82, a second telescopic member 83, and a piston member 84. The two ends of the box body 81 are respectively fixedly connected to the two feeding pipes 22, and the output ends of the two extraction pipes 82 are respectively fixedly disposed at the two ends of the box body 81. The piston member 84 is an I-shaped piston structure. The second telescopic member 83 is installed on the box body 81 and is used to drive the piston member 84 to extend and retract. The feeding pipe 22 and the extraction pipe 82 are each equipped with an independent one-way valve.

[0079] In this embodiment, the extraction pipe 82 is connected to the phosphate solution supply tank and is used to automatically and quantitatively extract the phosphate solution when the piston structure at the end of the piston member 84 contracts. Then, the quantitatively extracted phosphate solution is pushed into the pretreatment tank 2 through the feeding pipe 22 by the extension of the piston structure.

[0080] In this embodiment, both ends of the piston 84 are slidably sealed to the housing 81, so that when the piston 84 moves, it can simultaneously achieve "one extraction and one delivery" of phosphate solution on both sides of the piston 84.

[0081] like Figure 6 As shown, the second telescopic member 83 is in a retracted state, and one side of the piston member 84 is squeezed to squeeze out the extracted phosphate solution into the pretreatment tank 2 on one side; the other side has a reserved extraction space for storing the extracted phosphate solution, which supports the addition of phosphate solution to the pretreatment tank 2 on the other side.

[0082] A phosphate solution is pre-extracted from the box 81 and stored quantitatively on one side of the piston 84. When it is necessary to transport the extracted phosphate solution to the interior of the pretreatment tank 2, the second telescopic member 83 is activated. The second telescopic member 83 drives the piston 84 to extend. The piston 84 pushes the quantitatively stored phosphate solution on one side through the interior of the feeding pipe 22 and into the interior of the pretreatment tank 2. On the other hand, the piston 84 draws phosphate solution into the box 81 through the extraction pipe 82 and stores it quantitatively on the other side of the piston 84 to support the next step of feeding into the other pretreatment tank 2. Under the control of the second telescopic member 83, the phosphate solution on both sides of the piston member 84 is simultaneously pumped and fed, which facilitates the continuous quantitative storage and feeding of the phosphate solution.

[0083] In an optional embodiment of this example, the second telescopic member 83 may be an electric telescopic rod, used to directly drive the piston member 84 to extend and retract.

[0084] The working principle of the wastewater pretreatment device provided in this embodiment: Let us define it as follows: in the initial state, a phosphate solution is pre-stored on one side of the piston 84; When it is necessary to add the phosphate solution from one side into the corresponding pretreatment tank 2, the second telescopic member 83 is activated. The second telescopic member 83 drives the piston member 84 to extend. As the piston member 84 moves, the phosphate solution from one side is injected into the corresponding pretreatment tank 2. While the piston 84 extends, a phosphate solution is also quantitatively extracted from the other side of the piston 84 and stored on the other side of the piston 84. Similarly, when it is necessary to add the phosphate solution from the other side into the corresponding pretreatment tank 2, the second telescopic member 83 is activated again. The second telescopic member 83 drives the piston member 84 to retract. As the piston member 84 moves, it injects the phosphate solution from the other side into the corresponding pretreatment tank 2. While the piston 84 is contracting, a phosphate solution is also quantitatively extracted from one side of the piston 84 and stored on one side of the piston 84. Thus, while quantitatively extracting phosphate solution from one side of the piston 84, the phosphate solution stored on the other side of the piston 84 is injected into the corresponding pretreatment tank 2.

[0085] Third embodiment: Please refer to the following: Figures 7 to 9 Based on the wastewater pretreatment device provided in the second embodiment of the present invention, the third embodiment of the present invention proposes another wastewater pretreatment device. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0086] Specifically, the wastewater pretreatment device provided in the third embodiment of the present invention is different in that a rotating disk 34 is rotatably installed at the other end of the connecting pipe 31, and the connecting rod 35 is fixedly connected to the switch cylinder 33 and the rotating disk 34. The housing 81 is provided with a transmission hole 811, which is located within the movement range of the piston 84. The second telescopic member 83 includes a connecting slide rod 831, a transmission frame 832, and a transmission crank 833. One end of the connecting slide rod 831 passes through the transmission hole 811 and is fixedly connected to the piston member 84. The transmission frame 832 is fixedly mounted on the other end of the connecting slide rod 831. One end of the transmission crank 833 is fixedly connected to the rotating disk 34, and the other end of the transmission crank 833 is inserted into the transmission frame 832 and is connected in transmission.

[0087] In this embodiment, both ends of the piston 84 are maintained outside the range of the transmission hole 811, so that the extraction range of the phosphate solution is staggered with the transmission hole 811, ensuring the stability of quantitative extraction and delivery of the phosphate solution.

[0088] In this embodiment, the transmission frame 832 is provided with a transmission sliding hole. The other end of the transmission crank 833 is inserted into the transmission sliding hole and is connected to the transmission frame 832 for transmission. When the transmission crank 833 rotates with the rotating disk 34, the transmission crank 833 drives the transmission frame 832 to swing back and forth through the transmission sliding hole, so as to realize the synchronous movement and adjustment of the piston 84, thereby realizing the synchronous movement of the piston 84 during the switching of the conveying direction of the switch cylinder 33.

[0089] The first driving component 32 drives the switching cylinder 33 to rotate and adjust, which is used to switch the wastewater conveying direction; during the switching process, the switching cylinder 33 drives the rotating disk 34 to rotate through the connecting rod 35, and the rotating disk 34 drives the transmission crank 833 to rotate. like Figure 9 (a) to Figure 9 (b) to Figure 9 As shown in (c), when the transmission crank 833 rotates clockwise, it drives the transmission frame 832 to move to the right. The transmission frame 832 drives the piston 84 to move to the right through the connecting slide rod 831. When the piston 84 moves to the right, one side draws out the phosphate solution and the other side pushes out the phosphate solution, so as to realize the one-drawing and one-feeding of the phosphate solution. Similarly, such as Figure 9 (c) to (c) Figure 9 (b) to Figure 9 As shown in (a), when the transmission crank 833 rotates counterclockwise, it drives the transmission frame 832 to move to the left. The transmission frame 832 drives the piston 84 to move to the left through the connecting slide rod 831. When the piston 84 moves to the left, one side pushes the phosphate solution and the other side draws out the phosphate solution, so as to realize the one-way delivery and one-way extraction of the phosphate solution. During the switching of wastewater input direction, phosphate solution can be extracted on one side and phosphate solution can be added on the other side, thus realizing automatic quantitative feeding of phosphate solution.

[0090] The working principle of the wastewater pretreatment device provided in this embodiment is as follows: During the first switchover, the liquid supply pipe 4 is not supplied with water: First, the first driving component 32 is activated. The first driving component 32 drives the switch cylinder 33 to rotate, and the switch cylinder 33 drives the switch port 331 to switch the wastewater conveying direction. The wastewater conveying direction is as follows: Figure 7 After the pretreatment tank 2 shown on the left, water is introduced into the liquid supply pipe 4; Meanwhile, during the rotation of the switch cylinder 33, the rotating disk 34 is synchronously driven to rotate clockwise via the connecting rod 35. The rotating disk 34 drives the transmission frame 832 to move via the transmission crank 833. The transmission frame 832 drives the piston 84 to move via the connecting slide rod 831, so that the phosphate solution is quantitatively extracted within the extraction range of the piston 84 connected to the pretreatment tank 2 on the left side for later use, while the extraction range of the piston 84 connected to the pretreatment tank 2 on the right side is compressed. During the second switch, the water supply pipe 4 is maintained to continuously supply water: When the water volume in the pretreatment tank 2 reaches the preset range, the first drive unit 32 is activated again. The first drive unit 32 drives the switch cylinder 33 to rotate and switch the wastewater conveying direction. The wastewater conveying direction is as follows: Figure 7 The pretreatment tank 2 shown on the right is continuously filled with water; During the rotation of the switch cylinder 33, the connecting rod 35 synchronously drives the rotating disk 34 to rotate counterclockwise. The rotating disk 34 drives the transmission frame 832 to move through the transmission crank 833. The transmission frame 832 drives the piston 84 to move through the connecting slide rod 831, so that the phosphate solution is quantitatively extracted within the extraction range of the piston 84 connected to the pretreatment tank 2 on the right side to automatically complete the extraction for later use, and the phosphate solution is compressed within the extraction range of the piston 84 connected to the pretreatment tank 2 on the left side to automatically complete the feeding. Under the premise of continuous water supply from the supply pipe 4, the rotational switching of the conveying direction of the switch cylinder 33 and the adaptive one-drawing and one-feeding of phosphate solution are simultaneously realized.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for processing and treating wastewater from metal ore beneficiation, characterized in that, Includes the following steps: Step S1, rapid oxidation treatment: In the first stage, 60% of the total amount of calcium hypochlorite and phosphate are added to the wastewater and stirred to generate first-stage wastewater. Step S2, deep oxidation treatment: In the second stage, 40% of the total amount of calcium hypochlorite is added to the wastewater from the first stage and stirred to generate wastewater from the second stage. Step S3, pH adjustment: Dilute sulfuric acid is added to the wastewater of the second stage to adjust the pH and generate tailings. Step S4: Residual chlorine removal; sodium sulfite is added to the tail liquid to neutralize residual ClO. - .

2. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, The phosphate is Na2HPO4, according to PO4 3- Heavy metals: 1.0-1.2:1 dosage.

3. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, In step S1, calcium hypochlorite is added to adjust the pH of the wastewater to 8.5-9.

0.

4. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, The stirring speed in step S1 is 200 rpm, and the stirring time is 20 min.

5. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, In step S2, calcium hypochlorite is added to adjust the pH of the first-stage wastewater to 9.0-9.

5.

6. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, In step S2, the stirring speed is 50 rpm and the stirring time is 30 min.

7. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, In step S3, the pH is adjusted to 7.0-7.5 to prevent alkaline water from corroding the flotation equipment.

8. The method for treating wastewater from metal ore beneficiation according to claim 1, characterized in that, In step S4, the molar ratio of sodium sulfite to residual chlorine is 1:

1.

9. A wastewater pretreatment device, used in the first stage of wastewater treatment in the metal ore beneficiation wastewater processing and treatment method according to any one of claims 1-8, characterized in that, The wastewater pretreatment device includes: Install rack; Two pretreatment tanks are fixedly mounted on the top of the mounting frame, and each pretreatment tank is equipped with an inlet pipe, a feed pipe and a discharge pipe; The switching mechanism includes a connecting pipe, a first driving component, and a switch cylinder. The two sides of the connecting pipe are fixedly connected to the two inlet pipes. The fixing part of the first driving component is fixedly disposed at one end of the connecting pipe. The driving part of the first driving component passes through the connecting pipe and is fixedly connected to the switch cylinder. The outer surface of the switch cylinder is rotatably connected to the inner surface of the connecting pipe. The switch cylinder has a switch port, and the input ends of the two inlet pipes are connected to the rotation range of the switch port. A liquid supply pipe, the output end of which is fixed to the bottom of the connecting pipe fitting, and the output end of which is offset from the rotation range of the switch cylinder; A mixing mechanism, which is mounted on the pretreatment tank; When the switch port is connected to one of the liquid inlet pipes, the output end of the liquid supply pipe is connected to one of the liquid inlet pipes through the connecting pipe and the switch cylinder, and the liquid is supplied without stopping through the open switch cylinder.

10. The wastewater pretreatment device according to claim 9, characterized in that, The wastewater pretreatment device also includes a safety mechanism, which includes a connecting pipe, an elastic support, and a safety piston. The bottom of the connecting pipe is fixed to the top of the connecting pipe, and the rotation range of the connecting pipe and the switch cylinder is staggered. The fixed part of the elastic support is fixed to the top of the connecting pipe, and the telescopic part of the elastic support is fixedly connected to the safety piston. The safety piston slides and seals with the connecting pipe.

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