Hydrometallurgy wastewater thickening equipment and circulating treatment system

Abstract

The utility model discloses hydrometallurgy wastewater thickening equipment and a circulating treatment system, belongs to the technical field of hydrometallurgy, and is designed for solving the problems of large occupied space and the like of the existing treatment device. The utility model discloses hydrometallurgy wastewater thickening equipment which comprises a buffer device, a flocculation device; the thickening device comprises a thickener, an overflow guide-out structure and a precipitation structure, and supernate of the thickener can flow out along an outlet of the overflow guide-out structure; and the precipitation structure is arranged below the overflow guide-out structure and can prevent particulate matters from reaching the overflow guide-out structure after passing through the precipitation structure. According to the hydrometallurgy wastewater thickening equipment and the circulating treatment system disclosed by the utility model, supernate can flow out along the outlet of the overflow guide-out structure, and only a device for receiving the supernate needs to be mounted at a set position outside the thickener, so that the occupied space is smaller; the sedimentation structure shortens the sedimentation distance of the particles, improves the sedimentation efficiency, reduces the flocculated particles entering the overflow guide-out structure, and improves the thickening effect.

Description

Technical Field

[0001] This utility model relates to the field of hydrometallurgical technology, and in particular to a hydrometallurgical wastewater thickening device and a recycling system. Background Technology

[0002] Lateritic nickel ore is a loose, clayey, multi-mineral aggregate containing metallic components such as nickel, cobalt, chromium, magnesium, and aluminum. Currently, hydrometallurgical processes are commonly used to extract useful metals and compounds from this aggregate. To treat flocs in metallurgical wastewater, a thickener is used in conjunction with a flocculant. The flocculant causes the flocs to coagulate into clumps, while the thickener causes these clumps to settle to the bottom, thus separating them from the aggregate.

[0003] Existing mineral processing wastewater treatment equipment mainly includes a mixing tank, a stabilizing tank, a thickener, a sedimentation tank, and a storage tank. The bottom of the mixing tank is connected to the bottom of the stabilizing tank, and the top of the stabilizing tank is connected to the thickener via a pipe. The thickener is connected to the sedimentation tank via a pipe, and the sedimentation tank is connected to the storage tank. Return water enters the mixing tank, and after being agitated, the water overflows from the stabilizing tank and enters the thickener. After the first sedimentation in the thickener, the water overflows and enters the sedimentation tank. After the second sedimentation in the sedimentation tank, the water enters the storage tank.

[0004] The defects of this mineral processing wastewater treatment device include: a simple structure, the use of an edge overflow mode, where the supernatant overflows from the four edges of the thickening tank, requiring a water collection tray to be set around the thickener, which is costly and takes up a lot of space; poor thickening effect, and the wastewater treated by the thickener is difficult to meet the standards for discharge into the sea. Utility Model Content

[0005] The purpose of this invention is to propose a thickening device and a recycling system for hydrometallurgical wastewater, which solves the problems of large space occupation in existing treatment devices and achieves good wastewater treatment effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A thickening device for hydrometallurgical wastewater includes: a buffer device with a buffer inlet and a buffer outlet; a flocculation device with its inlet connected to the buffer outlet; and a thickening device including a thickener, an overflow outlet structure, and a sedimentation structure, wherein the inlet of the thickener is connected to the outlet of the flocculation device; the overflow outlet structure is disposed at the top of the thickener, and the supernatant of the thickener can flow out along the outlet of the overflow outlet structure, the overflow outlet structure being isolated from the inlet of the thickener; the sedimentation structure is disposed below the overflow outlet structure, the sedimentation structure preventing particulate matter from passing through and reaching the overflow outlet structure, the sedimentation structure promoting the coagulation of flocculants located between it and the overflow outlet structure into particles and depositing them onto the sedimentation structure, the sedimentation structure being at least partially isolated from the inlet of the thickener.

[0008] In one preferred embodiment, the thickener includes a thickening tank and a vertically arranged baffle. The baffle divides the upper space of the thickening tank into an inlet area and an overflow outlet area. The liquid inlet of the thickener is located in the inlet area, and the overflow outlet structure and the sedimentation structure are both located in the overflow outlet area. The overflow outlet structure is higher than the bottom edge of the baffle.

[0009] In one preferred embodiment, the sedimentation structure is an inclined plate-like structure with at least two water passage holes. The cross-section of the water passage holes perpendicular to the axis is circular, elliptical, and / or polygonal.

[0010] In one preferred embodiment, the overflow outlet structure includes an outlet channel and at least two overflow channels, all of which are connected to the outlet channels. One end of each outlet channel extends outside the thickening tank to form the outlet of the overflow outlet structure. The end of the outlet channel inside the thickening tank is higher than the end outside the thickening tank.

[0011] In one preferred embodiment, the edges of the overflow outlet structure are respectively fixedly connected to the inner wall surface of the thickening tank and the side surface of the baffle; and / or, a portion of the edges of the sedimentation structure are respectively fixedly connected to the inner wall surface of the thickening tank and the side surface of the baffle.

[0012] In one preferred embodiment, the thickener further includes a rake mechanism, which includes a rake frame, a rake motor, a rake rotating rod, and a rake scraper. The rake frame spans the top of the thickening tank, the rake motor is fixed to the rake frame, one end of the rake rotating rod is connected to the rake motor, and the other end of the rake rotating rod extends into the thickening tank and is fixedly connected to the rake scraper. The rake scraper abuts against the inner wall of the thickening tank, and the rake motor can drive the rake scraper to rotate through the rake rotating rod to scrape off the sediment on the inner wall of the thickening tank.

[0013] In one preferred embodiment, the flocculation device includes a multi-stage overflow structure and a transition tank. The inlet end of the multi-stage overflow structure is connected to the buffer outlet, and the outlet end of the multi-stage overflow structure is connected to the transition tank. The multi-stage overflow structure has an opening for adding flocculant, and the top of the transition tank has an overflow channel for connecting to the thickener. The multi-stage overflow structure includes a first tank, a second tank, and a third tank. The third tank is connected to the transition tank, the second tank is disposed within the third tank, the opening for adding flocculant is disposed on the second tank, and the first tank is disposed within the second tank and connected to the buffer device.

[0014] In one preferred embodiment, the flocculation device further includes a flocculation stirring structure, which includes a second tank spanning frame, a second tank stirring motor, a second tank stirring rod, and a second tank stirring blade. The second tank spanning frame spans the second tank, the second tank stirring motor is fixed on the second tank spanning frame, one end of the second tank stirring rod is fixedly connected to the second tank stirring motor, and the other end extends into the second tank and is fixedly connected to the second tank stirring blade. The second tank stirring blade is located above the first tank.

[0015] In one preferred embodiment, the buffer device includes a buffer tank and a buffer tank agitator. The top of the buffer tank has a liquid inlet, and the bottom of the buffer tank has a liquid outlet communicating with the flocculation device. The buffer tank agitator is fixed above the buffer tank. A polyaluminum chloride injection pipe is provided at the top of the buffer tank. The buffer tank agitator includes a buffer tank support frame, a buffer tank agitator motor, a buffer tank agitator rod, and a buffer tank agitator blades. The buffer tank support frame spans the buffer tank, the buffer tank agitator motor is fixed on the buffer tank support frame, one end of the buffer tank agitator rod is fixedly connected to the buffer tank agitator motor, and the other end of the buffer tank agitator rod extends into the buffer tank and is fixedly connected to the buffer tank agitator blades.

[0016] On the other hand, the present invention adopts the following technical solution:

[0017] The circulating treatment system includes a countercurrent washing device, an iron and aluminum removal device, a nickel and cobalt immersion device, a manganese removal device, a detection device, and the aforementioned hydrometallurgical wastewater thickening device. The countercurrent washing device, the iron and aluminum removal device, the nickel and cobalt immersion device, the manganese removal device, and the hydrometallurgical wastewater thickening device are connected in sequence by pipelines. The outlet end of the hydrometallurgical wastewater thickening device is connected to a discharge pipeline and a circulation pipeline. The detection device is used to detect the turbidity of the metallurgical wastewater thickening device.

[0018] The overflow outlet structure of the hydrometallurgical wastewater thickening equipment disclosed in this utility model is fixedly connected to the top of the thickener. The supernatant can flow out along the outlet of the overflow outlet structure. Only a receiving device for the supernatant needs to be installed at a predetermined position outside the thickener, eliminating the need for a ring of receiving devices around the thickener. This reduces space occupation and the size of the receiving device, lowering costs and making it more convenient to use. The sedimentation structure prevents particles from passing through and reaching the overflow outlet structure. Moreover, the sedimentation structure shortens the settling distance of particles. Based on the principle of "shallow sedimentation," the sedimentation structure improves sedimentation efficiency, reduces the number of flocculated particles entering the overflow outlet structure, and enhances the thickening effect, solving the problem of substandard treatment results in existing thickeners.

[0019] The recycling system disclosed in this utility model includes the above-mentioned hydrometallurgical wastewater thickening equipment, which has a better treatment effect on wastewater, and the treated liquid meets the standards for discharge into the sea, making it more environmentally friendly to the marine environment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the connection relationship of the cyclic processing system provided in a specific embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the wet metallurgical wastewater thickening equipment provided in a specific embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of the buffer device provided in a specific embodiment of this utility model;

[0023] Figure 4 This is a top view of the combined structure of the flocculation device and the thickening device provided in a specific embodiment of this utility model;

[0024] Figure 5 This is a cross-sectional view of the combined structure of the flocculation device and the thickening device provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 1. Buffer device; 11. Buffer tank body; 12. Buffer tank stirring device; 13. Polyaluminum chloride filling pipe; 121. Buffer tank support frame; 122. Buffer tank stirring motor; 123. Buffer tank stirring rod; 124. Buffer tank stirring blades;

[0027] 2. Flocculation device; 21. Multi-stage overflow structure; 22. Transition tank; 23. Flocculation stirring structure; 211. First tank; 212. Second tank; 213. Third tank; 231. Second tank spanning frame; 232. Second tank stirring motor; 233. Second tank stirring rod; 234. Second tank stirring blade;

[0028] 3. Thickening device; 31. Thickener; 32. Overflow outlet structure; 33. Sedimentation structure; 311. Thickening tank; 311a. Inlet area; 311b. Overflow outlet area; 312. Rake mechanism; 312a. Rake frame; 312b. Rake motor; 312c. Rake rotating rod; 312d. Rake scraper; 313. Baffle; 321. Outlet trough; 322. Overflow trough; 331. Plate structure;

[0029] 100. Thickening equipment for hydrometallurgical wastewater; 200. Countercurrent washing equipment; 300. Iron and aluminum removal equipment; 400. Nickel and cobalt immersion equipment; 500. Manganese removal equipment; 600. Detection equipment; 700. Control equipment; 800. Outfall pipeline; 900. Circulation pipeline. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] This embodiment discloses a hydrometallurgical wastewater thickening device and a circulating treatment system including the hydrometallurgical wastewater thickening device, used to treat various mineral hydrometallurgical wastewaters, especially suitable for treating hydrometallurgical wastewater from laterite nickel ore. The treated water is cleaner and can be directly discharged or recycled. Figure 1As shown, the circulating treatment system includes a hydrometallurgical wastewater thickening device 100, a countercurrent scrubbing device 200, an iron and aluminum removal device 300, a nickel-cobalt immersion device 400, a manganese removal device 500, a detection device 600, and a control device 700. The countercurrent scrubbing device 200, the iron and aluminum removal device 300, the nickel-cobalt immersion device 400, the manganese removal device 500, and the hydrometallurgical wastewater thickening device 100 are connected in sequence through pipelines.

[0037] The outlet end of the hydrometallurgical wastewater thickening equipment 100 is connected to a discharge pipe 800 and a circulation pipe 900. The discharge pipe 800 extends to the sea surface to discharge the treated water into the sea. The circulation pipe 900 is connected between the hydrometallurgical wastewater thickening equipment 100 and the countercurrent washing equipment 200.

[0038] A detection device 600 is installed at the outlet of the hydrometallurgical wastewater thickening device 100. The detection device 600 is used to detect the turbidity of the effluent from the metallurgical wastewater thickening device. A discharge solenoid valve is installed on the discharge pipeline 800, and a circulation solenoid valve is installed on the circulation pipeline 900. A control device 700 is electrically connected to the detection device 600, the discharge solenoid valve, and the circulation solenoid valve, respectively. The detection device 600 can send the detection results to the control device 700, and the control device 700 can control the opening and closing of the discharge solenoid valve and the circulation solenoid valve based on the detection results.

[0039] When the test results from the testing equipment 600 meet the discharge standards, the control equipment 700 opens the discharge solenoid valve and closes the circulation solenoid valve, and the treated water is directly discharged into the sea through the discharge pipeline 800. When the test results from the testing equipment 600 do not meet the discharge standards, the control equipment 700 closes the discharge solenoid valve and opens the circulation solenoid valve, and the treated water enters the countercurrent washing equipment 200 through the circulation pipeline 900 for recirculation treatment until it meets the discharge standards, which is more environmentally friendly to the marine environment.

[0040] The specific structures of the countercurrent washing equipment 200, the iron and aluminum removal equipment 300, the nickel and cobalt immersion equipment 400, and the manganese removal equipment 500 are not limited; any relevant equipment in the existing technology can be used, and the difference in specific product models does not affect their role in this embodiment. The detection equipment 600 can be, but is not limited to, a turbidity meter; any other device capable of detecting the turbidity of the effluent from the metallurgical wastewater thickening equipment is acceptable.

[0041] In this embodiment, the control device 700 can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program to control the detection device 600, the discharge solenoid valve, and the circulation solenoid valve to achieve their functions through electrical connections.

[0042] like Figure 2As shown, the wet metallurgical wastewater thickening equipment includes a buffer device 1, a flocculation device 2, and a thickening device 3. In use, the wastewater is first introduced into the buffer device 1 for buffering, then introduced into the flocculation device 2 for flocculation treatment, and then the liquid from the flocculation device 2 is introduced into the thickening device 3 for thickening.

[0043] The thickening device 3 includes a thickener 31, an overflow outlet structure 32, and a sedimentation structure 33. The buffer device 1 includes a buffer inlet and a buffer outlet. The inlet of the flocculation device 2 is connected to the buffer outlet, and the outlet of the flocculation device 2 is connected to the inlet of the thickener 31. The overflow outlet structure 32 is fixedly connected to the top of the thickener 31, allowing the supernatant from the thickener 31 to flow out along the outlet of the overflow outlet structure 32. Only a device for receiving the supernatant needs to be installed at a designated location outside the thickener 31; there is no need for a ring of receiving devices around the thickener 31, resulting in less space usage, a smaller receiving device, reduced costs, and greater ease of use.

[0044] To allow sufficient reaction time, the overflow outlet structure 32 is isolated from the liquid inlet of the thickener 31. The liquid flowing into the thickener 31 from the liquid inlet needs to flow a certain distance or stay in the thickener 31 for a certain period of time before reaching the overflow outlet structure 32. During this process, particulate matter settles to the bottom of the thickener 31. The water that reaches the overflow outlet structure 32 is clean enough to meet the standard for direct discharge.

[0045] The sedimentation structure 33 is fixedly connected to the bottom of the overflow outlet structure 32. The sedimentation structure 33 can prevent particulate matter from passing through and reaching the overflow outlet structure 32, ensuring that only clean water that can be directly discharged reaches the overflow outlet structure 32, resulting in better wastewater treatment.

[0046] In addition, the particles located above the sedimentation structure 33 and below the overflow outlet structure 32 can be directly sedimented on the sedimentation structure 33 without settling to the bottom of the thickener 31. This shortens the settling distance of the particles, thereby shortening the sedimentation time and increasing the overall sedimentation area. According to the principle of "shallow sedimentation", the sedimentation structure 33 improves the sedimentation efficiency, promotes the coagulation of flocs between it and the overflow outlet structure 32 into particles and deposits them on the sedimentation structure 33, reduces the number of flocculent particles entering the overflow outlet structure 32, improves the thickening effect, and solves the problem of substandard treatment results in the existing technology.

[0047] Figure 5 This is a cross-sectional view, showing only a section of the sedimentation structure 33. It can be understood that the projection of the sedimentation structure 33 onto the horizontal plane basically coincides with the bottom of the thickener 31. The higher end of the sedimentation structure 33 is closer to the overflow outlet structure 32, while the lower end of the sedimentation structure 33 is closer to the bottom of the thickener 31.

[0048] To ensure that as much floc as possible forms particles in the thickener 31, the sedimentation structure 33 is at least partially isolated from the inlet end of the thickener 31. Liquid flowing into the thickener 31 from the inlet needs to flow a certain distance or remain in the thickener 31 for a certain period before reaching the sedimentation structure 33. During this process, most of the flocs agglomerate into particles that fall to the bottom of the thickener 31, resulting in good thickening effect.

[0049] like Figure 3 As shown, the buffer device 1 includes a buffer tank 11 and a buffer tank stirring device 12. The top of the buffer tank 11 has an inlet, through which the wastewater to be treated enters the buffer tank 11. The bottom of the buffer tank 11 has a drain outlet connected to the flocculation device 2, through which the wastewater to be treated can enter the flocculation device 2. The buffer tank stirring device 12 is fixed above the buffer tank 11 and is used to stir the liquid inside the buffer tank 11. A polyaluminum chloride (PAC) filling pipe 13 is opened at the top of the buffer tank 11 for adding polyaluminum chloride (PAC) into the buffer tank 11.

[0050] The specific structure of the buffer tank agitator 12 is not limited, as long as it can agitate the liquid inside the buffer tank 11. In this embodiment, the buffer tank agitator 12 includes a buffer tank support frame 121, a buffer tank agitator motor 122, a buffer tank agitator rod 123, and a buffer tank agitator blades 124. The buffer tank support frame 121 spans the buffer tank 11, the buffer tank agitator motor 122 is fixed on the buffer tank support frame 121, one end of the buffer tank agitator rod 123 is fixedly connected to the buffer tank agitator motor 122, and the other end of the buffer tank agitator rod 123 extends into the buffer tank 11 and is fixedly connected to the buffer tank agitator blades 124. The overall structure is stable, the agitation is more thorough, and the substances in the wastewater are more uniform, preparing for subsequent coagulation into particles.

[0051] like Figure 4 and Figure 5 As shown, the flocculation device 2 includes a multi-stage overflow structure 21 and a transition tank 22. The inlet end of the multi-stage overflow structure 21 is connected to the buffer outlet of the buffer device 1, and the outlet end of the multi-stage overflow structure 21 is connected to the transition tank 22. The side wall of the transition tank 22 is fixedly attached to the side wall of the thickener 31. An overflow channel is formed at the top of the transition tank 22 to overflow to the thickener 31, and the transition tank 22 and the thickener 31 are connected through the overflow channel. The multi-stage overflow structure 21 has an opening for adding flocculant. After the flocculant reacts with the wastewater to be treated, it forms particulate matter, which is deposited at the bottom of the thickener 31, turning the wastewater into clear water.

[0052] In this embodiment, the multi-stage overflow structure 21 includes a first tank 211, a second tank 212, and a third tank 213 nested in sequence. The third tank 213 is connected to the bottom of the transition tank 22. The second tank 212 is disposed inside the third tank 213 and is shorter than the third tank 213. An opening for adding flocculant is disposed on the second tank 212. The first tank 211 is disposed inside the second tank 212, and the bottom of the first tank 211 is connected to the bottom of the buffer device 1.

[0053] like Figures 2 to 5 As shown, the liquid in the buffer device 1 first enters the first tank 211 and then overflows into the second tank 212; after flocculant is added in the second tank 212, the liquid overflows into the third tank 213 and then flows into the transition tank 22.

[0054] The specific structures of the multi-stage overflow structure 21 and the transition tank 22 are not limited. In this embodiment, the transition tank 22 is a rectangular tank structure with one side fitting into the thickener 31, which facilitates processing and makes the connection between the transition tank 22 and the thickener 31 more stable. The third tank 213 has a semi-circular (or arc-shaped) cross-section, and the arcuate side of the third tank 213 fits into the side of the transition tank 22 away from the thickener 31.

[0055] The bow-shaped third tank 213 and the rectangular transition tank 22 work together with the thickener 31 to achieve overflow water intake, causing the water flow to undulate up and down, forming an S-shaped flow channel, which is conducive to promoting the sedimentation of particulate matter. In addition, the cross-sectional area of ​​the outlet of the transition tank 22 is larger than that of the inlet, so the water flow overflowing from the transition tank 22 to the thickener 31 is relatively calm with less impact, which helps the thickener 31 to better flocculate and settle, thus improving the flocculation and sedimentation effect of the thickener 31.

[0056] Based on the above structure, the flocculation device 2 also includes a flocculation stirring structure 23. Specifically, the flocculation stirring structure 23 includes a second tank spanning frame 231, a second tank stirring motor 232, a second tank stirring rod 233, and a second tank stirring blade 234. The second tank spanning frame 231 spans across the second tank 212, and the second tank stirring motor 232 is fixed on the second tank spanning frame 231. One end of the second tank stirring rod 233 is fixedly connected to the second tank stirring motor 232, and the other end extends into the second tank 212 and is fixedly connected to the second tank stirring blade 234. The second tank stirring blade 234 is located above the first tank 211. The second tank spanning frame 231 makes the overall structure of the flocculation stirring structure 23 more stable, avoids violent shaking when the second tank stirring blade 234 rotates, improves the stirring effect, makes the wastewater composition in the second tank 212 more uniform, and allows for more sufficient contact between the wastewater and the flocculant, which is conducive to the coagulation of particulate matter.

[0057] like Figure 4 and Figure 5 As shown, the thickener 31 includes a thickening tank 311 and a vertically arranged baffle 313. The thickening tank 311 is fitted into the transition tank 22, and the baffle 313 is fixedly connected to the upper inner wall of the thickening tank 311. The baffle 313 divides the upper space of the thickening tank 311 into an inlet area 311a and an overflow outlet area 311b. The inlet area 311a is connected to the overflow channel of the transition tank 22, that is, the liquid inlet end of the thickener 31 is located in the inlet area 311a. Both the overflow outlet structure 32 and the sedimentation structure 33 are located above the overflow outlet area 311b. In order to prevent the wastewater in the transition tank 22 from directly reaching the overflow outlet structure 32 through the inlet of the thickener 31, the overflow outlet structure 32 and at least part of the sedimentation structure 33 are higher than the bottom edge of the baffle 313. This ensures that the wastewater in the transition tank 22 must flow downwards for a certain distance before reaching the bottom edge of the baffle 313 and passing over the bottom edge of the baffle 313 before reaching the bottom of the overflow outlet structure 32, thereby promoting the sedimentation of as many particles as possible in the wastewater.

[0058] Based on the above structure, the thickener 31 also includes a rake mechanism 312. The rake mechanism 312 is fixed on the thickening tank 311 and is used to scrape off the sediment on the inner wall of the thickening tank 311. The scraper mechanism 312 includes a scraper frame 312a, a scraper motor 312b, a scraper rotating rod 312c, and a scraper scraper 312d. The scraper frame 312a spans the top of the thickening tank 311. The scraper motor 312b is fixed on the scraper frame 312a. One end of the scraper rotating rod 312c is connected to the scraper motor 312b, and the other end of the scraper rotating rod 312c extends into the thickening tank 311 and is fixedly connected to the scraper scraper 312d. The scraper scraper 312d abuts against the inner wall of the thickening tank 311. The scraper motor 312b can drive the scraper scraper 312d to rotate through the scraper rotating rod 312c to scrape off the sediment on the inner wall of the thickening tank 311, allowing the sediment to be discharged from the bottom of the thickener 31.

[0059] During use, the liquid overflows from the transition tank 22 into the inlet area 311a. After being thickened by the thickener 31, the precipitate falls onto the inner wall of the thickener tank 311. The sedimentation structure 33, located below the overflow outlet structure 32, guides the particulate matter to settle, thereby significantly reducing the flocculated particles in the overflow liquid. The clear liquid overflows into the overflow outlet structure 32 and is discharged, resulting in a good thickening effect.

[0060] To ensure that the supernatant from the thickener 31 can flow out of the overflow outlet structure 32 as quickly as possible, the area of ​​the overflow outlet region 311b is larger than the area of ​​the inlet region 311a, thereby allowing for a larger overflow outlet structure 32 and improving outlet efficiency. The specific areas of the overflow outlet region 311b and the inlet region 311a are not limited; in this embodiment, the ratio of the area of ​​the inlet region 311a to the area of ​​the overflow outlet region 311b is between 1:4 and 1:10.

[0061] Based on the above structure, the overflow outlet structure 32 includes an outlet tank 321 and at least two overflow tanks 322. The outlet tank 321 is located in the center of the overflow outlet area 311b. All the overflow tanks 322 are located on both sides of the outlet tank 321 and are connected to the outlet tank 321. Moreover, all the overflow tanks 322 are inclined towards the outlet tank 321 so that the liquid can flow smoothly into the outlet tank 321.

[0062] One end of the outlet tank 321 extends outside the thickening tank 311, forming the outlet of the overflow outlet structure 32. In order to allow the liquid to flow smoothly out along the outlet tank 321, the end of the outlet tank 321 inside the thickening tank 311 is higher than the end outside the thickening tank 311.

[0063] The specific installation structure of the overflow outlet structure 32 and the sedimentation structure 33 is not limited. In this embodiment, the edges of the overflow outlet structure 32 are fixedly connected to the inner wall surface of the thickening tank 311 and the side surface of the baffle 313, respectively. Specifically, one end of the outlet trough 321 extends outside the thickening tank 311, and the other end is fixedly connected to the baffle 313; one end of each overflow trough 322 is fixedly connected to the inner wall of the thickening tank 311, and the other end is connected to the outlet trough 321. The edges of the sedimentation structure 33 are fixedly connected to the inner wall surface of the thickening tank 311 and the side surface of the baffle 313, respectively, making the connection structure more stable.

[0064] The specific structure of the sedimentation structure 33 is not limited, as long as it can promote the sedimentation of particulate matter. In this embodiment, the sedimentation structure 33 is an inclined plate-like structure 331, and the plate-like structure 331 has at least two water passage holes. The structure between two adjacent water passage holes helps to block particulate matter from passing through the water passage holes, thereby preventing particulate matter in the wastewater from passing through the sedimentation structure 33 and reaching the overflow outlet structure 32. In order to better block particulate matter, the axis of the water passage holes is inclined relative to the plane where the sedimentation structure 33 is located. The particulate matter rising with the water flow either hits the mesh between the water passage holes or hits the barrier of the water passage holes, preventing it from passing through the sedimentation structure 33.

[0065] To improve the efficiency of clean water flow reaching the overflow outlet structure 32, multiple water passages are closely arranged on the sedimentation structure 33. The shape of the cross-section of the water passage perpendicular to the axis is not limited; in this embodiment, the cross-section of the water passage is circular, elliptical, and / or polygonal. In particular, when the water passage is honeycomb-shaped (regular hexagonal), the water flow efficiency is higher, and the blocking effect on particulate matter is best.

[0066] The operation method of this wet metallurgical wastewater thickening equipment is as follows: Wastewater is introduced into buffer device 1 for buffering, and polyaluminum chloride is injected into buffer tank 11 through polyaluminum chloride injection pipe 13; the buffer tank stirring device 12 is started to improve the uniformity of polyaluminum chloride in buffer device 1; the mixture of wastewater and polyaluminum chloride is introduced into first tank 211, and then overflows into second tank 212; flocculant is added into second tank 212, and flocculation stirring structure 23 is started; the stirring of flocculation stirring structure 23 makes the second tank 212... The flocculant in tank 212 reacts fully with the substance and then overflows into the third tank 213. The liquid flows into the transition tank 22 and gradually accumulates. When it accumulates to the overflow channel at the top of the transition tank 22, the liquid overflows into the thickening tank 311. The particulate matter gradually settles in the thickening tank 311. The sedimentation structure 33 shortens the particle settling distance, thereby shortening the sedimentation time and preventing the sediment from reaching the overflow outlet structure 32 through the sedimentation structure 33, thereby reducing particulate matter in the overflow liquid and improving the thickening effect.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A thickening device for hydrometallurgical wastewater, characterized in that, include: The buffer device (1) includes a buffer inlet and a buffer outlet; The flocculation device (2) has its inlet end connected to the buffer outlet; as well as, A thickening device (3) includes a thickener (31), an overflow outlet structure (32), and a sedimentation structure (33). The inlet end of the thickener (31) is connected to the outlet end of the flocculation device (2). The overflow outlet structure (32) is located at the top of the thickener (31), and the supernatant of the thickener (31) can flow out along the outlet of the overflow outlet structure (32). The overflow outlet structure (32) is isolated from the inlet end of the thickener (31). The sedimentation structure (33) is located below the overflow outlet structure (32). The sedimentation structure (33) can prevent particulate matter from passing through and reaching the overflow outlet structure (32). The sedimentation structure (33) can promote the flocculation of the flocculated material located between it and the overflow outlet structure (32) into particles and deposit them on the sedimentation structure (33). The sedimentation structure (33) is at least partially isolated from the inlet end of the thickener (31).

2. The hydrometallurgical wastewater thickening equipment according to claim 1, characterized in that, The thickener (31) includes a thickening tank (311) and a vertically arranged baffle (313). The baffle (313) divides the upper space of the thickening tank (311) into a water inlet area (311a) and an overflow outlet area (311b). The liquid inlet end of the thickener (31) is located in the water inlet area (311a). The overflow outlet structure (32) and the sedimentation structure (33) are both located in the overflow outlet area (311b). The overflow outlet structure (32) is higher than the bottom edge of the baffle (313).

3. The hydrometallurgical wastewater thickening equipment according to claim 2, characterized in that, The sedimentation structure (33) is an inclined plate-shaped structure (331), and at least two water passage holes are provided on the plate-shaped structure (331). The cross-section of the water passage holes perpendicular to the axis is circular, elliptical and / or polygonal.

4. The hydrometallurgical wastewater thickening equipment according to claim 2, characterized in that, The overflow outlet structure (32) includes an outlet channel (321) and at least two overflow channels (322), all of which are connected to the outlet channel (321). One end of the outlet channel (321) extends out of the thickening tank (311) to form the outlet of the overflow outlet structure (32). The end of the outlet channel (321) inside the thickening tank (311) is higher than the end outside the thickening tank (311).

5. The hydrometallurgical wastewater thickening equipment according to claim 2, characterized in that, The edges of the overflow outlet structure (32) are respectively fixedly connected to the inner wall surface of the thickening tank (311) and the side surface of the baffle (313); and / or, Parts of the edges of the sedimentation structure (33) are fixedly connected to the inner wall of the thickening tank (311) and the side of the baffle (313).

6. The hydrometallurgical wastewater thickening equipment according to claim 2, characterized in that, The thickener (31) also includes a rake mechanism (312), which includes a rake frame (312a), a rake motor (312b), a rake rotating rod (312c), and a rake scraper (312d). The rake frame (312a) spans the top of the thickener tank (311), the rake motor (312b) is fixed on the rake frame (312a), and one end of the rake rotating rod (312c) is connected to... The other end of the rake motor (312b) and the rake rotating rod (312c) extend into the thickening tank (311) and are fixedly connected to the rake scraper (312d). The rake scraper (312d) abuts against the inner wall of the thickening tank (311). The rake motor (312b) can drive the rake scraper (312d) to rotate through the rake rotating rod (312c) to scrape off the sediment on the inner wall of the thickening tank (311).

7. The hydrometallurgical wastewater thickening equipment according to any one of claims 1 to 6, characterized in that, The flocculation device (2) includes a multi-stage overflow structure (21) and a transition tank (22). The inlet end of the multi-stage overflow structure (21) is connected to the buffer outlet, and the outlet end of the multi-stage overflow structure (21) is connected to the transition tank (22). An opening for adding flocculant is provided on the multi-stage overflow structure (21), and an overflow channel for connecting to the thickener (31) is provided on the top of the transition tank (22). The multi-stage overflow structure (21) includes a first tank (211), a second tank (212), and a third tank (213). The third tank (213) is connected to the transition tank (22). The second tank (212) is disposed inside the third tank (213). The opening for adding flocculant is disposed on the second tank (212). The first tank (211) is disposed inside the second tank (212) and is connected to the buffer device (1).

8. The hydrometallurgical wastewater thickening equipment according to claim 7, characterized in that, The flocculation device (2) further includes a flocculation stirring structure (23), which includes a second tank spanning frame (231), a second tank stirring motor (232), a second tank stirring rod (233), and a second tank stirring blade (234). The second tank spanning frame (231) spans the second tank (212), and the second tank stirring motor (232) is fixed on the second tank spanning frame (231). One end of the second tank stirring rod (233) is fixedly connected to the second tank stirring motor (232), and the other end extends into the second tank (212) and is fixedly connected to the second tank stirring blade (234). The second tank stirring blade (234) is located above the first tank (211).

9. The hydrometallurgical wastewater thickening equipment according to any one of claims 1 to 6, characterized in that, The buffer device (1) includes a buffer tank (11) and a buffer tank stirring device (12). The top of the buffer tank (11) is provided with a liquid inlet, and the bottom of the buffer tank (11) is provided with a liquid outlet communicating with the flocculation device (2). The buffer tank stirring device (12) is fixed above the buffer tank (11). A polyaluminum chloride injection pipe (13) is opened on the top of the buffer tank (11). The buffer tank stirring device (12) includes a buffer tank spanning frame (121), a buffer tank stirring motor (122), a buffer tank stirring rod (123), and a buffer tank stirring blade (124). The buffer tank spanning frame (121) spans the buffer tank body (11). The buffer tank stirring motor (122) is fixed on the buffer tank spanning frame (121). One end of the buffer tank stirring rod (123) is fixedly connected to the buffer tank stirring motor (122), and the other end of the buffer tank stirring rod (123) extends into the buffer tank body (11) and is fixedly connected to the buffer tank stirring blade (124).

10. A cyclic processing system, characterized in that, The system includes a countercurrent scrubbing device (200), an iron and aluminum removal device (300), a nickel and cobalt immersion device (400), a manganese removal device (500), a detection device (600), and a hydrometallurgical wastewater thickening device (100) as described in any one of claims 1 to 9. The countercurrent scrubbing device (200), the iron and aluminum removal device (300), the nickel and cobalt immersion device (400), the manganese removal device (500), and the hydrometallurgical wastewater thickening device (100) are connected in sequence by pipelines. The outlet end of the hydrometallurgical wastewater thickening device (100) is connected to a discharge pipe (800) and a circulation pipe (900). The detection device (600) is used to detect the turbidity of the metallurgical wastewater thickening device.

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