Method and device for processing and treating metal ore dressing wastewater

Abstract

The application provides a metal ore dressing wastewater processing method and device, and relates to the technical field of wastewater treatment. The metal ore dressing wastewater processing method comprises 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 first-stage wastewater and stirred to generate second-stage wastewater. A wastewater pretreatment device is used for the first stage of wastewater treatment in the metal ore dressing wastewater processing method. According to the scheme, efficient oxidation of ammonia nitrogen is realized by two-stage calcium hypochlorite addition, and Ca 2+ PO4 3+ Hydroxyapatite is generated to fix heavy metals, residual reagents are simultaneously controlled, and the treated water can be directly used for the flotation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a processing method and device for wastewater from ore dressing of metal ores. BACKGROUND

[0002] The wastewater from ore dressing of metal ores contains a large amount of harmful substances and cannot be directly recycled. If the wastewater from ore dressing is discharged into rivers, lakes and other water bodies, the water quality will be acidified, the growth environment of bacteria and microorganisms will be destroyed, and the self-purification function of the water body will be reduced. In addition, the heavy metals in the wastewater from ore dressing are non-biodegradable and are difficult to remove from the environment. Therefore, the wastewater after ore dressing needs to be purified.

[0003] At present, sodium hypochlorite is often used for oxidation treatment of the wastewater from ore dressing due to the high ammonia nitrogen concentration of the wastewater from ore dressing. However, the residual Cl - concentration in the tail liquid after oxidation treatment is far higher than the standard for recycling, and the recycling is prone to cause corrosion of the flotation equipment. In addition, the oxidation byproducts will inhibit the activity of flotation reagents. Therefore, how to realize wastewater treatment while ensuring the safe and reliable recycling of the wastewater needs further research.

[0004] Therefore, it is necessary to provide a processing method for wastewater from ore dressing of metal ores to solve the above technical problems. SUMMARY

[0005] The present application provides a processing method for wastewater from ore dressing of metal ores, which solves the problem of how to realize wastewater treatment while ensuring the safe and reliable recycling of the wastewater in the related art.

[0006] To solve the above technical problems, the processing method for wastewater from ore dressing of metal ores provided by the present application comprises the following steps:

[0007] 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;

[0008] Step S2, deep oxidation treatment, in the second stage, 40% of the total amount of calcium hypochlorite is added to the first-stage wastewater and stirred to generate second-stage wastewater;

[0009] Step S3, PH adjustment, dilute sulfuric acid is added to the second-stage wastewater to adjust the pH to generate tail liquid;

[0010] Step S4, residual chlorine elimination, sodium sulfite is added to the tail liquid to neutralize the residual ClO - .

[0011] Preferably, the phosphate is Na2HPO4, which is added in a ratio of PO4 3- : heavy metal = 1.0-1.2:1.

[0012] Preferably, the pH of the wastewater after the addition of calcium hypochlorite in step S1 is adjusted to 8.5-9.0.

[0013] Preferably, the stirring speed of the stirring treatment in step S1 is 200 rpm, and the stirring time is 20 min.

[0014] Preferably, the pH of the wastewater after the addition of calcium hypochlorite in step S2 is adjusted to 9.0-9.5.

[0015] Preferably, the stirring speed of the stirring treatment in step S2 is 50 rpm, and the stirring time is 30 min.

[0016] Preferably, the pH is adjusted to 7.0-7.5 in step S3 to avoid corrosion of the flotation equipment by alkaline water.

[0017] Preferably, the molar ratio of sodium sulfite to residual chlorine in step S4 is 1:1.

[0018] The present application also provides a wastewater pretreatment device for the first stage of wastewater treatment in the metal ore beneficiation wastewater processing method, the wastewater pretreatment device comprising:

[0019] a mounting rack;

[0020] two pretreatment tanks, both of which are fixedly arranged on the top of the mounting rack, and each of the pretreatment tanks is provided with a liquid inlet pipe, a feeding pipe and a discharge pipe;

[0021] a switching mechanism, the switching mechanism comprising a connecting pipe, a first driving member and a switching cylinder, the two sides of the connecting pipe are fixedly connected to the two liquid inlet pipes, the fixed part of the first driving member is fixedly arranged at one end of the connecting pipe, the driving part of the first driving member is fixedly connected to the switching cylinder after penetrating the connecting pipe, and the outer surface of the switching cylinder is rotatably connected to the inner surface of the connecting pipe; the switching cylinder is provided with a switching opening, and the input ends of the two liquid inlet pipes are arranged within the rotation range of the switching opening;

[0022] a liquid supply pipe, the output end of the liquid supply pipe is fixed to the bottom of the connecting pipe, and the output end of the liquid supply pipe is distributed in a staggered manner with the rotation range of the switching cylinder;

[0023] a mixing mechanism, the mixing mechanism is installed on the pretreatment tank;

[0024] When the switching opening 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 switching cylinder, and the liquid is continuously delivered through the switching cylinder in the open state.

[0025] 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.

[0026] Compared with related technologies, the method for treating metal ore beneficiation wastewater provided by this invention has the following beneficial effects:

[0027] 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

[0028] 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.

[0029] Figure 1 A three-dimensional view of a first embodiment of the wastewater pretreatment device provided by the present invention;

[0030] Figure 2 for Figure 1 A top view of the horizontal cross-section of the connecting pipe fitting shown;

[0031] Figure 3 for Figure 1 A schematic diagram of the vertical cross-section of the connecting pipe fitting shown;

[0032] Figure 4 for Figure 1 The diagram shows the structure of the AA cross section;

[0033] Figure 5 A three-dimensional view of a second embodiment of the wastewater pretreatment device provided by the present invention;

[0034] Figure 6 for Figure 5 A schematic cross-sectional view of the feeding mechanism shown.

[0035] Figure 7 A three-dimensional diagram of a third embodiment of the wastewater pretreatment device provided by the present invention;

[0036] Figure 8 As Figure 7 The connection structure schematic view of the second telescopic part is shown in the figure;

[0037] Figure 9 As Figure 7 The synchronous adjustment principle view of the second telescopic part is shown in the figure, wherein, Figure 9 (a) in the figure is the structure schematic view of the transmission frame in the state of being located at the left side of the box body, Figure 9 (b) in the figure is the structure schematic view in the state switching process of the transmission frame, Figure 9 (c) in the figure is the structure schematic view of the transmission frame in the state of being located at the right side of the box body.

[0038] Explanation of the reference signs:

[0039] 1, installation rack;

[0040] 2, pretreatment tank; 21, liquid inlet pipe; 22, feeding pipe; 23, discharge pipe;

[0041] 3, switching mechanism; 31, connecting pipe; 32, first driving part; 33, switch cylinder; 331, switch opening; 34, rotating disc; 35, connecting rod;

[0042] 4, liquid supply pipe;

[0043] 5, safety mechanism; 51, communication pipe; 52, elastic supporting part; 53, safety piston; 54, pressure sensor;

[0044] 6, mixing mechanism; 61, second driving part; 62, driving shaft; 621, installation cavity; 622, sliding hole; 63, stirring rod; 64, cleaning part; 641, first telescopic part; 642, sliding shaft; 643, scraper;

[0045] 7, filter part;

[0046] 8, feeding mechanism; 81, box body; 811, transmission hole; 82, material extraction pipe; 83, second telescopic part; 831, connecting sliding rod; 832, transmission frame; 833, transmission crank; 84, piston part.

[0047] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0049] The application provides a metal ore dressing wastewater processing method.

[0050] In an embodiment of the application, the metal ore dressing wastewater processing method comprises the following steps:

[0051] 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;

[0052] Step S2, deep oxidation treatment, in the second stage, 40% of the total amount of calcium hypochlorite is added to the first-stage wastewater and stirred to generate second-stage wastewater;

[0053] Step S3, PH adjustment, dilute sulfuric acid is added to the second-stage wastewater to adjust the pH to generate tail liquid;

[0054] Step S4, residual chlorine elimination, sodium sulfite is added to the tail liquid to neutralize residual ClO - .

[0055] The total amount of calcium hypochlorite is the total amount of calcium hypochlorite used in the whole process.

[0056] Further, the phosphate is Na2HPO4, and the amount of Na2HPO4 added is 1.0-1.2 times the amount of PO4 3- .

[0057] Further, in step S1, the pH of the wastewater after adding calcium hypochlorite is adjusted to 8.5-9.0.

[0058] Further, in step S1, the stirring speed is 200 rpm, and the stirring time is 20 min.

[0059] Further, in step S2, the pH of the first-stage wastewater after adding calcium hypochlorite is adjusted to 9.0-9.5.

[0060] Further, in step S2, the stirring speed is 50 rpm, and the stirring time is 30 min.

[0061] Further, in step S3, the pH is adjusted to 7.0-7.5 to avoid corrosion of the flotation equipment by alkaline water.

[0062] Further, in step S4, the molar ratio of sodium sulfite to residual chlorine is 1:1 to neutralize residual ClO - , and ensure that Cl - ≤50mg / L.

[0063] Through two-stage calcium hypochlorite addition, efficient oxidation of ammonia nitrogen (NH3-N≤5mg / L) is achieved, and Ca2+ with PO4 3+ Hydroxyapatite (HAP) is generated to fix heavy metals (concentration ≤0.5mg / L), and residual reagents (Cl - ≤50mg / L, PO4 3- ≤5mg / L) are simultaneously controlled, ensuring that the treated water can be directly reused in the flotation process. Example 1:

[0064] High ammonia-nitrogen lead-zinc mine wastewater treatment:

[0065] Raw water quality: NH 3- N 800mg / L, Pb 2+ 100mg / L, Zn 2+ 150mg / L, pH 6.5.

[0066] Treatment process:

[0067] Calcium hypochlorite dosage:

[0068] Total dosage 4.2g / L (ClO - : NH 3- N = 5: 1), in two stages (60% + 40%).

[0069] After the first stage, NH 3- N decreased to 120mg / L, and after the second stage, it reached 4.5mg / L.

[0070] Phosphate precipitation: Na2HPO41.2g / L (PO4 3- : heavy metal = 1.2: 1) was added, the effluent Pb 2+ 0.3mg / L, Zn 2+ 0.4mg / L.

[0071] Water quality optimization: pH was adjusted to 7.2, Cl - 45mg / L, PO4 3- 4.8mg / L.

[0072] Reuse effect: lead flotation recovery rate increased by 2.8%, and equipment was not corroded. Example 2:

[0073] Medium-concentration copper mine wastewater treatment:

[0074] Raw water quality: NH 3- N 500mg / L, Cu 2+ 120mg / L, pH 6.8.

[0075] Treatment process:

[0076] Calcium hypochlorite dosage: total dosage 2.8g / L (ClO- : NH 3- N = 4.5 : 1), in stages.

[0077] After the first stage, NH 3- N 75 mg / L, to 3.2 mg / L after the second stage.

[0078] Phosphate precipitation: Na2HPO40.9 g / L (PO4 3- : Cu 2+ = 1.1 : 1), effluent Cu 2+ 0.2 mg / L.

[0079] Water quality optimization: pH 7.0, Cl - 38 mg / L, PO4 3- 3.9 mg / L.

[0080] Reuse effect: copper concentrate grade increased from 22% to 23.5%. Example 3:

[0081] Treatment of low ammonia-nitrogen and heavy metal composite wastewater:

[0082] Raw water quality: NH 3- N 300 mg / L, Cu 2+ 80 mg / L, Zn 2+ 60 mg / L, pH 7.0.

[0083] Treatment process:

[0084] Calcium hypochlorite dosage: total dosage 1.7 g / L (ClO - : NH 3- N = 4.2 : 1), two-stage dosage.

[0085] After the first stage, NH 3- N 45 mg / L, to 2.1 mg / L after the second stage.

[0086] Phosphate precipitation: Na2HPO40.6 g / L (PO4 3- : heavy metal = 1.0 : 1), effluent Cu 2+ 0.1 mg / L, Zn 2+ 0.08 mg / L.

[0087] Water quality optimization: pH 7.3, Cl - 28 mg / L, PO4 3- 2.5 mg / L.

[0088] Reuse effect: flotation reagent dosage reduced by 15%.

[0089] The application further provides a wastewater pretreatment device for the first stage of wastewater treatment in the metal ore dressing wastewater processing method.

[0090] First embodiment:

[0091] Please refer to Figures 1 to 4 In the first embodiment of the application, the wastewater pretreatment device comprises:

[0092] A mounting rack 1;

[0093] Two pretreatment tanks 2, both of which are fixedly arranged on the top of the mounting rack 1, and each of the pretreatment tanks 2 is provided with a liquid inlet pipe 21, a feeding pipe 22 and a discharge pipe 23;

[0094] A switching mechanism 3, which comprises a connecting pipe 31, a first driving member 32 and a switching cylinder 33, the two sides of the connecting pipe 31 are fixedly connected to the two liquid inlet pipes 21, the fixed part of the first driving member 32 is fixedly arranged at one end of the connecting pipe 31, the driving part of the first driving member 32 is fixedly connected to the switching cylinder 33 after penetrating the connecting pipe 31, and the outer surface of the switching cylinder 33 is rotationally connected to the inner surface of the connecting pipe 31; the switching cylinder 33 is provided with a switching opening 331, and the input ends of the two liquid inlet pipes 21 are butted in the rotation range of the switching opening 331;

[0095] A liquid supply pipe 4, the output end of which is fixed to the bottom of the connecting pipe 31, and the output end of the liquid supply pipe 4 is distributed in the rotation range of the switching cylinder 33 in a staggered manner;

[0096] A mixing mechanism 6, which is installed on the pretreatment tank 2;

[0097] When the switching opening 331 is butted and communicated with one of the liquid inlet pipes 21, the output end of the liquid supply pipe 4 is communicated with one of the liquid inlet pipes 21 through the connecting pipe 31 and the switching cylinder 33, and the switching cylinder 33 is continuously delivered in an open state.

[0098] In this embodiment, both of the pretreatment tanks 2 are used for the first stage of wastewater treatment;

[0099] The discharge pipe 23 is provided with an independent control valve structure, which is used for discharging the wastewater treated in the pretreatment tank 2 to the next process.

[0100] The first driving member 32 adopts a motor structure, which provides power for the rotation adjustment of the switching cylinder 33, so as to facilitate the rotation switching of the delivery direction of the switching opening 331;

[0101] As Figure 2As shown, the switch opening 331 is communicated with one of the liquid inlet pipes 21, and the other liquid inlet pipe 21 is closed, so that the liquid supply pipe 4 can communicate the wastewater to one of the liquid inlet pipes 21 through the open switch opening 331;

[0102] Similarly, when the switch opening 331 is communicated with the other liquid inlet pipe 21, one of the liquid inlet pipes 21 is closed, so that the liquid supply pipe 4 can communicate the wastewater to the other liquid inlet pipe 21 through the open switch opening 331;

[0103] In order to meet the requirement of sequentially injecting the wastewater into the two pretreatment tanks 2, and avoid frequent start and stop of the liquid supply pipe 4.

[0104] The mixing mechanism 6 is used for stirring and mixing the wastewater input into the pretreatment tank 2, and provides support for stirring and mixing.

[0105] In this embodiment, the time required for injecting the wastewater into the pretreatment tank 2 to the preset dose is 30 min, the time for stirring and processing the wastewater in the pretreatment tank 2 is 20 min, and the time required for discharging the wastewater in the pretreatment tank 2 is 10 min.

[0106] When the liquid supply pipe 4 continuously injects the wastewater into the interior of one of the pretreatment tanks 2, the wastewater injected in advance in the interior of the other pretreatment tank 2 can be simultaneously stirred and processed, and after the stirring and processing is completed, the wastewater is discharged;

[0107] When the wastewater in the interior of one of the pretreatment tanks 2 is completely injected, the wastewater in the interior of the other pretreatment tank 2 is completely stirred and processed and discharged;

[0108] The first driving member 32 is started, the first driving member 32 drives the switch cylinder 33 to rotate, the switch cylinder 33 drives the switch opening 331 to rotate, controls the switch opening 331 to be communicated with the liquid inlet pipe 21 of the other pretreatment tank 2, and the other liquid inlet pipe 21 is closed; without the need to close the liquid supply pipe 4, the conveying direction of the switch opening 331 is switched, the continuous and uninterrupted conveying, stirring and processing and discharging of the wastewater are realized, and the time for waiting for the shutdown of the wastewater input pipeline is reduced.

[0109] In this embodiment, the feeding pipe 22 is used for adding the phosphate solution into the pretreatment tank 2, and the calcium hypochlorite is directly added through the top of the pretreatment tank 2.

[0110] Please refer to Figure 1 and Figure 3The wastewater pretreatment device further comprises a safety mechanism 5, the safety mechanism 5 comprises a communication pipe 51, an elastic support 52 and a safety piston 53, the bottom of the communication pipe 51 is fixedly arranged at the top of the connecting pipe 31, the communication pipe 51 is distributed in the range of the rotation of the switch cylinder 33, the fixed part of the elastic support 52 is fixedly arranged at the top of the communication pipe 51, the telescopic part of the elastic support 52 is fixedly connected with the safety piston 53, and the safety piston 53 is in sliding sealing with the communication pipe 51.

[0111] As shown in the embodiment, the top of the communication pipe 51 is provided with an opening for guaranteeing the stability of the safety piston 53 during the lifting sliding. Figure 1

[0112] The elastic support 52 provides elastic support for the safety piston 53, when the switch cylinder 33 is opened, the water pressure in the connecting pipe 31 is normal, and the safety piston 53 is located at the bottom of the communication pipe 51.

[0113] When the switch cylinder 33 is switched in direction and the switch opening 331 is closed, the water pressure in the connecting pipe 31 is increased, and the safety piston 53 is buffered and slides upward under pressure.

[0114] By additionally arranging the communication pipe 51 on the connecting pipe 31, when the switch cylinder 33 is rotated and closed, the continuously input wastewater in the connecting pipe 31 can press the safety piston 53, the safety piston 53 moves upward and compresses the elastic support 52, so that the water pressure in the connecting pipe 31 is buffered under the condition that the liquid supply pipe 4 does not stop, and the high-pressure pipe explosion phenomenon is avoided.

[0115] Further, the safety mechanism 5 further comprises a pressure sensor 54, the pressure sensor 54 is fixedly arranged in the communication pipe 51, and the pressure sensor 54 is aligned with the contraction range of the safety piston 53.

[0116] The pressure sensor 54 is convenient for detecting whether the safety piston 53 rises to a warning point, so as to judge whether the wastewater pressure in the connecting pipe 31 is increased, so as to conveniently detect the water pressure in the wastewater conveying pipeline.

[0117] In an optional embodiment of the embodiment, the liquid supply pipe 4 is connected with a wastewater conveying pump, and the pressure sensor 54 is signal-connected with the wastewater conveying pump.

[0118] When the pressure sensor 54 detects a pressure signal, the wastewater conveying pump is automatically closed to stop water supply.

[0119] ​When the pressure sensor 54 detects no pressure signal, the waste water delivery pump maintains an open operation state, and water supply is continued.

[0120] Please refer to Figure 1 and Figure 4 , the mixing mechanism 6 comprises a second driving member 61, a driving shaft 62, a stirring rod 63 and a cleaning member 64, the fixed part of the second driving member 61 is fixedly arranged on the bottom of the pretreatment tank 2, the driving part of the second driving member 61 is fixedly connected with the driving shaft 62 after penetrating the bottom of the pretreatment tank 2, the stirring rod 63 is fixedly arranged on the driving shaft 62, and the cleaning member 64 is installed on 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.

[0121] The second driving member 61 is a motor structure and is fixedly installed on the bottom of the pretreatment tank 2, and provides power for the rotation adjustment of the driving shaft 62, so as to drive the stirring rod 63 to stir and mix the solution injected into the interior of the pretreatment tank 2.

[0122] When it is necessary to stir and mix the solution in the interior of the pretreatment tank 2, the second driving member 61 is started, the second driving member 61 drives the driving shaft 62 to rotate, the driving shaft 62 drives the stirring rod 63 to rotate, and the stirring rod 63 stirs and mixes the solution in the interior of the pretreatment tank 2.

[0123] Please refer to Figure 4 , the driving shaft 62 is provided with an installation cavity 621 and a sliding hole 622 which are in communication with each other;

[0124] The cleaning member 64 comprises a first telescopic member 641, a sliding shaft 642 and a scraper 643, the sliding shaft 642 is slidingly installed on the driving shaft 62 through the installation cavity 621, the sliding shaft 642 is shielded in the range of the sliding hole 622, the two ends of the first telescopic member 641 are fixedly connected with the driving shaft 62 and the sliding shaft 642, and one end of the scraper 643 is fixedly connected with the sliding shaft 642 after penetrating the sliding hole 622.

[0125] In the embodiment, the telescopic range of the sliding shaft 642 is aligned with the range of the sliding hole 622, in the state that the sliding shaft 642 is connected with the scraper 643, the sliding sealing property of the sliding shaft 642 and the driving shaft 62 is maintained.

[0126] The first telescopic member 641 is an electric telescopic rod, and provides power for the lifting adjustment of the sliding shaft 642 and the scraper 643.

[0127] By installing the scraper 643 with adjustable lifting on the driving 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 the contact when unnecessary cleaning, prolonging the service life of the equipment;

[0128] When the scraper 643 is adjusted downward and abuts against the pretreatment tank 2, when the scraper 643 rotates with the driving shaft 62, it can rotate and clean along the bottom of the inner wall of the pretreatment tank 2, so as to clean the internal deposits, so that the deposits can be stably discharged with the water flow when the pretreatment tank 2 is drained.

[0129] Further, the wastewater pretreatment device further comprises a filter 7, which is installed on the discharge pipe 23.

[0130] In this embodiment, the filter 7 adopts a plate filter, which is used for filtering the wastewater passing through the discharge pipe 23 to remove the sediment particles in the wastewater.

[0131] By additionally providing the filter 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 treatment of the wastewater.

[0132] The working principle of the wastewater pretreatment device provided in this embodiment is as follows:

[0133] When the device is used, the switch opening 331 is controlled to communicate with one of the liquid inlet pipes 21 in advance, and the liquid supply pipe 4 is opened to continuously inject the wastewater needing to be treated into the interior of one of the pretreatment tanks 2;

[0134] When the wastewater is injected into the interior of one of the pretreatment tanks 2 in a sufficient amount, on one hand, calcium hypochlorite is added to the interior of one of the pretreatment tanks 2, and on the other hand, calcium hypochlorite solution is added through the feeding pipe 22; and the second driving member 61 is started to drive the driving shaft 62 to rotate, the driving shaft 62 drives the stirring rod 63 to rotate, and the wastewater is stirred and mixed until a preset stirring period is reached. After the stirring period ends, the discharge pipe 23 is opened to transport the wastewater in the interior of one of the pretreatment tanks 2 into the next process, thereby providing support for the first stage of continuous treatment of the wastewater;

[0135] The first driving member 32 is started at the same time when the wastewater is injected into the interior of one of the pretreatment tanks 2, the first driving member 32 drives the switch cylinder 33 to rotate, the switch cylinder 33 drives the switch opening 331 to rotate, the conveying direction of the switch opening 331 is adjusted and switched, so that the switch opening 331 communicates with another of the liquid inlet pipes 21, and the liquid supply pipe 4 is continuously supplied with liquid;

[0136] Wherein, in the process of rotating the switch port 331, when the switch port 331 completely blocks the shielding range of the connecting pipe 31, the liquid supply pipe 4 continuously injects the wastewater in the connecting pipe 31 to press the safety piston 53 upward, the safety piston 53 is self-adaptingly contracted to maintain the constant water pressure in the connecting pipe 31, and the water pressure increasing accident is avoided.

[0137] Second embodiment:

[0138] Please refer to Figures 5 to 6 , based on the first embodiment of the wastewater pretreatment device, the second embodiment of the present application provides another wastewater pretreatment device. The second embodiment is only a preferred way of the first embodiment, and the implementation of the second embodiment does not affect the separate implementation of the first embodiment.

[0139] Specifically, the wastewater pretreatment device provided by the second embodiment of the present application is different in that the wastewater pretreatment device further comprises a feeding mechanism 8, the feeding mechanism 8 comprises a box body 81, two material extraction pipes 82, a second telescopic piece 83 and a piston piece 84, both ends of the box body 81 are fixedly communicated with two feeding pipes 22 respectively, the output ends of the two material extraction pipes 82 are fixedly arranged at both ends of the box body 81 respectively, the piston piece 84 is a I-shaped piston structure, the second telescopic piece 83 is installed on the box body 81, and the second telescopic piece 83 is used for driving the piston piece 84 to stretch and retract for adjustment.

[0140] Wherein, the feeding pipe 22 and the material extraction pipe 82 are respectively provided with independent one-way valves.

[0141] In the embodiment, the material extraction pipe 82 is connected with a phosphate solution supply tank, which is used for automatically extracting a certain amount of phosphate solution when the piston structure at the end of the piston piece 84 is contracted, and then pushing the extracted phosphate solution into the inside of the pretreatment tank 2 through the feeding pipe 22 by the extension of the piston structure.

[0142] In the embodiment, both ends of the piston piece 84 are slidingly sealed with the box body 81, so that the piston piece 84 can realize “one extraction and one delivery” of the phosphate solution on both sides of the piston piece 84 at the same time when moving.

[0143] As Figure 6 shown, the second telescopic piece 83 is in a contracted state, one side of the piston piece 84 is pressed, and the extracted phosphate solution is discharged into the pretreatment tank 2 on one side; the other side is reserved for extraction space, which is used for storing the extracted phosphate solution to support the filling of phosphate solution for the pretreatment tank 2 on the other side.

[0144] The phosphate solution is extracted in advance and quantitatively stored in one side of the piston 84 in the box 81. When the extracted phosphate solution needs to be delivered to the inside of the pretreatment tank 2, the second telescopic member 83 is started to drive the piston 84 to extend. The piston 84 pushes the phosphate solution quantitatively stored in one side through the inside of the feeding pipe 22 and into the inside of the pretreatment tank 2;

[0145] The piston 84 extracts the phosphate solution into the box 81 through the extraction pipe 82 and quantitatively stores the phosphate solution in the other side of the piston 84 to support the feeding of the other pretreatment tank 2 in the next step;

[0146] Under the control of the second telescopic member 83, the phosphate solution in both sides of the piston 84 is extracted and delivered synchronously, which facilitates the continuous quantitative storage and feeding of the phosphate solution.

[0147] In an optional embodiment of the embodiment, the second telescopic member 83 can be an electric telescopic rod for directly driving the piston 84 to extend and retract.

[0148] The working principle of the wastewater pretreatment device provided by the embodiment is as follows:

[0149] It is defined that the phosphate solution is quantitatively stored in one side of the piston 84 in the initial state;

[0150] When the phosphate solution in one side needs to be added into the corresponding pretreatment tank 2, the second telescopic member 83 is started to drive the piston 84 to extend. The piston 84 moves while injecting the phosphate solution in one side into the corresponding pretreatment tank 2;

[0151] While the piston 84 extends, the phosphate solution is also quantitatively extracted in the other side of the piston 84 and stored in the other side of the piston 84;

[0152] Similarly, when the phosphate solution in the other side needs to be added into the corresponding pretreatment tank 2, the second telescopic member 83 is started again to drive the piston 84 to retract. The piston 84 moves while injecting the phosphate solution in the other side into the corresponding pretreatment tank 2;

[0153] While the piston 84 retracts, the phosphate solution is also quantitatively extracted in one side of the piston 84 and stored in one side of the piston 84;

[0154] Thus, the phosphate solution stored on the other side of the piston piece 84 is injected into the corresponding pretreatment tank 2 while the phosphate solution is quantitatively extracted on one side of the piston piece 84.

[0155] Third embodiment:

[0156] Please refer to Figures 7 to 9 Based on the second embodiment of the present application, the third embodiment of the present application provides another wastewater pretreatment device. The third embodiment is only a preferred mode of the first embodiment, and the implementation of the third embodiment does not affect the separate implementation of the first embodiment.

[0157] Specifically, the wastewater pretreatment device provided by the third embodiment of the present application is different in that the other end of the connecting pipe piece 31 is rotatably installed with a rotating disc 34, and a connecting rod 35 is fixedly connected with the switch cylinder 33 and the rotating disc 34.

[0158] The box body 81 is provided with a transmission hole 811, and the transmission hole 811 is located in the moving range of the piston piece 84.

[0159] The second telescopic piece 83 includes a connecting slide rod 831, a transmission frame 832, and a transmission crank 833. One end of the connecting slide rod 831 is fixedly connected with the piston piece 84 after penetrating through the transmission hole 811. The transmission frame 832 is fixedly arranged at the other end of the connecting slide rod 831. One end of the transmission crank 833 is fixedly connected with the rotating disc 34, and the other end of the transmission crank 833 is inserted into the transmission frame 832 and is in transmission connection.

[0160] In this embodiment, both ends of the piston piece 84 are maintained outside the range of the transmission hole 811, so that the extraction range of the phosphate solution is distributed in a staggered manner with the transmission hole 811, thereby ensuring the stability of the quantitative extraction and delivery of the phosphate solution.

[0161] In this embodiment, the transmission frame 832 is provided with a transmission sliding hole, and the other end of the transmission crank 833 is in transmission connection with the transmission frame 832 after being inserted into the transmission sliding hole. When the transmission crank 833 rotates with the rotating disc 34, the transmission crank 833 drives the transmission frame 832 to reciprocate left and right through the transmission sliding hole, so as to realize the synchronous movement adjustment of the piston piece 84, thereby realizing the movement of the piston piece 84 during the switching of the delivery direction of the switch cylinder 33.

[0162] The first driving piece 32 drives the switch cylinder 33 to rotate and adjust, so as to switch the delivery direction of the wastewater. During the switching, the switch cylinder 33 drives the rotating disc 34 to rotate through the connecting rod 35, and the rotating disc 34 drives the transmission crank 833 to rotate.

[0163] As shown in (a) to (c) of FIG. 8, when the transmission crank 833 rotates clockwise, the transmission frame 832 moves rightward, the transmission frame 832 drives the piston 84 to move rightward through the connecting slide rod 831, and the piston 84 moves rightward to extract phosphate solution on one side and push phosphate solution on the other side, so as to realize one extraction and one push of phosphate solution. Figure 9 Figure 9 As shown in (a) to (c) of FIG. 8, when the transmission crank 833 rotates clockwise, the transmission frame 832 moves rightward, the transmission frame 832 drives the piston 84 to move rightward through the connecting slide rod 831, and the piston 84 moves rightward to extract phosphate solution on one side and push phosphate solution on the other side, so as to realize one extraction and one push of phosphate solution. Figure 9 As shown in (a) to (c) of FIG. 8, when the transmission crank 833 rotates clockwise, the transmission frame 832 moves rightward, the transmission frame 832 drives the piston 84 to move rightward through the connecting slide rod 831, and the piston 84 moves rightward to extract phosphate solution on one side and push phosphate solution on the other side, so as to realize one extraction and one push of phosphate solution.

[0164] Figure 9 As shown in (a) to (c) of FIG. 8, when the transmission crank 833 rotates clockwise, the transmission frame 832 moves rightward, the transmission frame 832 drives the piston 84 to move rightward through the connecting slide rod 831, and the piston 84 moves rightward to extract phosphate solution on one side and push phosphate solution on the other side, so as to realize one extraction and one push of phosphate solution. Figure 9 Figure 9 As shown in (a) to (c) of FIG. 8, when the transmission crank 833 rotates clockwise, the transmission frame 832 moves rightward, the transmission frame 832 drives the piston 84 to move rightward through the connecting slide rod 831, and the piston 84 moves rightward to extract phosphate solution on one side and push phosphate solution on the other side, so as to realize one extraction and one push of phosphate solution.

[0165] In the process of switching in the wastewater input direction, one side of the phosphate solution is extracted, and the other side of the phosphate solution is fed, so as to realize automatic quantitative feeding of the phosphate solution.

[0166] The working principle of the wastewater pretreatment device provided in the embodiment is as follows:

[0167] When the first switching is performed, the liquid supply pipe 4 is not supplied with water:

[0168] First, the first driving member 32 is started, the first driving member 32 drives the switch cylinder 33 to rotate, the switch cylinder 33 drives the switch opening 331 to switch the wastewater conveying direction, and the wastewater conveying direction is towards the left side of the pretreatment tank 2 as shown in FIG. 8, then the liquid supply pipe 4 starts to supply water; Figure 7

[0169] At the same time, in the process of rotating the switch cylinder 33, the connecting rod 35 synchronously drives the rotating disc 34 to rotate clockwise, the rotating disc 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 extraction range of the piston 84 connected with the left side of the pretreatment tank 2 is quantitatively extracted for standby, and the extraction range of the piston 84 connected with the right side of the pretreatment tank 2 is compressed;

[0170] When the second switching is performed, the liquid supply pipe 4 is continuously supplied with water:

[0171] ​​​​When the water injection amount in the pretreatment tank 2 reaches a preset range, the first driving member 32 is started again to rotate the switch cylinder 33 to switch the wastewater conveying direction, and the wastewater conveying direction is towards the right side of the pretreatment tank 2 as shown in the figure, and the water injection is continued; Figure 7

[0172] In the process of rotating the switch cylinder 33, the connecting rod 35 synchronously drives the rotating disc 34 to rotate counterclockwise, the rotating disc 34 drives the transmission frame 832 to move through the transmission crank 833, the transmission frame 832 drives the piston member 84 to move through the connecting slide rod 831, so that the phosphate solution in the extraction range of the piston member 84 connected with the right side pretreatment tank 2 is extracted quantitatively to automatically complete the liquid extraction for standby, and the phosphate solution in the extraction range of the piston member 84 connected with the left side pretreatment tank 2 is compressed to automatically complete the feeding;

[0173] Under the premise of continuously supplying water through the liquid supply pipe 4, the rotation switching of the conveying direction of the switch cylinder 33 and the self-adaptive extraction and delivery of the phosphate solution are simultaneously realized.

[0174] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the concept of the present application, using the content of the present application specification and drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.​

Claims

1. A method for processing and treating metal ore beneficiation wastewater, characterized by, It comprises 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 a first-stage wastewater; Step S2, deep oxidation treatment, in the second stage, 40% of the total amount of calcium hypochlorite is added to the first-stage wastewater and stirred to generate a second-stage wastewater; Step S3, pH adjustment, dilute sulfuric acid is added to the second-stage wastewater to adjust the pH to generate a tail liquid; Step S4; residual chlorine elimination, addition of sodium sulfite to the tail liquid to neutralize residual ClO - ; The phosphate is Na2HPO4, 0.5-1.0 g / L 3- : heavy metal = 1.0-1.2:1 dosage; The pH of the wastewater after adding calcium hypochlorite in step S1 is adjusted to 8.5-9.0; Ca 2+ With PO4 3+ Hydroxyapatite is produced to immobilize heavy metals.

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

3. The method for processing metal ore beneficiation wastewater according to claim 1, characterized in that, The pH of the first-stage wastewater after adding calcium hypochlorite in step S2 is adjusted to 9.0-9.

5.

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

5. The method for processing metal ore beneficiation wastewater according to claim 1, characterized in that, The pH is adjusted to 7.0-7.5 in step S3 to avoid corrosion of the flotation equipment by alkaline water.

6. The method for processing metal ore beneficiation wastewater according to claim 1, characterized in that, The molar ratio of sodium sulfite to residual chlorine in step S4 is 1:

1.

7. A wastewater pre-treatment device for use in the first stage of wastewater treatment in a method of processing wastewater from the processing of metal ores according to any one of claims 1 to 6, characterised in that, The wastewater pretreatment device comprises: a mounting rack; two pretreatment tanks, both of which are fixedly arranged on the top of the mounting rack, and each of the pretreatment tanks is provided with an inlet pipe, a feeding pipe and a discharge pipe; a switching mechanism, which comprises a connecting pipe, a first driving member and a switching cylinder, the two sides of the connecting pipe are fixedly connected to the two inlet pipes, the fixed part of the first driving member is fixedly arranged at one end of the connecting pipe, the driving part of the first driving member penetrates through the connecting pipe and is fixedly connected to the switching cylinder, and the outer surface of the switching cylinder is rotationally connected to the inner surface of the connecting pipe; a switching opening is formed in the switching cylinder, and the input ends of the two inlet pipes are docked within the rotation range of the switching opening; a liquid supply pipe, the output end of which is fixed to the bottom of the connecting pipe, and the output end of the liquid supply pipe is distributed in a staggered manner with the rotation range of the switching cylinder; a mixing mechanism, which is installed on the pretreatment tank; when the switching opening is docked with one of the inlet pipes, the output end of the liquid supply pipe is connected to one of the inlet pipes through the connecting pipe and the switching cylinder, and the liquid is continuously delivered through the switching cylinder in the open state.

8. The wastewater pretreatment device of claim 7, wherein The wastewater pretreatment device further comprises a safety mechanism, which comprises a communication pipe, an elastic support and a safety piston, the bottom of the communication pipe is fixedly arranged on the top of the connecting pipe, the communication pipe is distributed in a staggered manner with the rotation range of the switching cylinder, the fixed part of the elastic support is fixedly arranged on the top of the communication pipe, the telescopic part of the elastic support is fixedly connected to the safety piston, and the safety piston is slidingly sealed with the communication pipe.

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