A thickening device and recycling system for wastewater from hydrometallurgical treatment of laterite nickel ore.

Abstract

This application discloses a thickening device for hydrometallurgical wastewater from laterite nickel ore, comprising a buffer device, a flocculation device, and a thickening device. The inlet end of the flocculation device is connected to the buffer device, and the outlet end of the flocculation device is connected to the thickening device. The thickening device includes a thickener, an overflow outlet structure, and an inclined plate sedimentation structure. The thickener is connected to the flocculation device. The overflow outlet structure is fixed above the thickener for discharging the supernatant from the thickener. The inclined plate sedimentation structure is fixed below the overflow outlet structure to promote the sedimentation of particulate matter in the thickener body. The inclined plate sedimentation structure promotes the sedimentation of particulate matter in the thickener and prevents particulate matter from entering above the inclined plate sedimentation structure. The overflow outlet structure guides the supernatant from the thickener out of the outlet. The inclined plate sedimentation structure of this application can guide the sedimentation of particulate matter, thereby significantly reducing flocculated particles in the overflow liquid and improving the thickening effect.

Description

Technical Field

[0001] This application relates to the field of hydrometallurgical technology, specifically to a thickening device and recycling system for wastewater from laterite nickel ore hydrometallurgical processes. Background Technology

[0002] Lateritic nickel ore is a loose, clayey, multi-mineral aggregate formed from nickel-bearing olivine bedrock in tropical or subtropical regions through long-term weathering, leaching, dissemination, and alteration. It contains metallic components such as nickel, cobalt, chromium, magnesium, and aluminum. Currently, in the hydrometallurgical process of lateritic nickel ore, the wastewater contains a small amount of flocculants, which are typically treated using thickeners in conjunction with flocculants.

[0003] For example, patent CN212151911U provides a deep treatment and reuse device for mineral processing wastewater, which includes a stirring tank, a stabilizing tank, a thickener, a sedimentation tank, and a water storage tank. The bottom of the stirring tank is connected to the bottom of the stabilizing tank, the top of the stabilizing tank is connected to the thickener through a pipe, the thickener is connected to the sedimentation tank through a pipe, and the sedimentation tank is connected to the water storage tank. Return water enters the stirring tank, and the water after being stirred in the stirring tank 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 water storage tank.

[0004] However, the problem is that thickeners are not very effective at treating wastewater containing fine solid particles with low concentrations, which makes it difficult for the wastewater treated by thickeners to meet the standards for discharge into the sea. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a thickening equipment and recycling system for wastewater from hydrometallurgical treatment of laterite nickel ore, thereby solving the technical problem that the thickeners in the prior art fail to meet the treatment standards.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: This application provides a thickening device for wastewater from hydrometallurgical treatment of laterite nickel ore, comprising: Buffer device; A flocculation device, wherein the inlet end of the flocculation device is connected to the buffer device; and A thickening device includes a thickener, an overflow outlet structure, and an inclined plate sedimentation structure. An inlet area and an overflow outlet area are formed above the thickener. The inlet area extends into the flocculation device and communicates with the upper part of the flocculation device. The overflow outlet structure is built into the upper side of the overflow outlet area of ​​the thickener and is used to discharge the supernatant from the thickener. The inclined plate sedimentation structure is fixed below the overflow outlet structure and is used to promote the sedimentation of particulate matter in the thickener body. The height of the inlet area is lower than that of the overflow outlet area.

[0007] In some embodiments, the thickener includes a thickener tank, a rake mechanism, and a baffle. The baffle is fixed to the upper inner wall of the thickener tank, dividing the upper space of the thickener tank into an inlet area and an overflow outlet area. The rake mechanism is fixed to the thickener tank and is used to scrape off sediment on the inner wall of the thickener tank.

[0008] In some embodiments, the overflow outlet structure includes an outlet trough and a plurality of overflow troughs. The outlet trough is disposed in the center of the overflow outlet area. One end of the outlet trough is fixedly connected to the baffle, and the other end extends to the outside of the sealed tank. The plurality of overflow troughs are arranged on both sides of the outlet trough. One end of each overflow trough is fixedly connected to the inner wall of the sealed tank, and the other end is fixedly connected to the outlet trough.

[0009] In some embodiments, the inclined plate sedimentation structure includes a plate body with a plurality of through holes. The through holes are closely arranged and have a honeycomb-shaped cross-section, and the through holes are inclined.

[0010] In some embodiments, the rake mechanism includes a rake frame, a rake motor, a rake rotating rod, and a rake scraper. The rake frame spans the thickener tank, the rake motor is fixed on the rake frame, one end of the rake rotating rod is fixed to the rake motor, and the other end extends into the thickener tank. The rake scraper is fixed to the rake rotating rod and abuts against the inner wall of the thickener tank.

[0011] In some embodiments, the flocculation device includes a multi-stage overflow structure and a transition tank. The multi-stage overflow structure is connected to the buffer device and the transition tank. The multi-stage overflow structure has a flocculant addition port. The transition tank is connected to the side of the thickener opposite the baffle, and the overflow area of ​​the thickener extends into the transition tank.

[0012] In some embodiments, the multi-stage overflow structure includes a first tank, a second tank, and a third tank. The third tank is connected to the bottom of the transition tank. The second tank is disposed inside the third tank and is lower in height than the third tank. The second tank has a flocculant addition port. The first tank is disposed inside the second tank and its bottom is connected to the bottom of the buffer device.

[0013] In some embodiments, 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 fixed to the second tank stirring motor, the other end of the second tank stirring rod extends into the second tank, and the second tank stirring blade is fixed on the end of the second tank stirring rod that extends into the second tank. The second tank stirring blade is located above the first tank.

[0014] In some embodiments, the buffer device includes a buffer tank and a buffer tank stirring device. The top of the buffer tank is provided with a liquid inlet, the bottom of the buffer tank is provided with a liquid outlet communicating with the flocculation device, and the top of the buffer tank is provided with a PAC injection pipe for injecting PAC into the buffer tank. The buffer tank stirring device is fixed above the buffer tank for stirring the liquid in the buffer tank.

[0015] This application also provides a circulating treatment system, comprising: a thickening device for laterite nickel ore hydrometallurgical wastewater as described in any of the above claims, a countercurrent washing device, an iron and aluminum removal device, a nickel-cobalt precipitation device, a manganese removal device, a detection device, and a control device. The countercurrent washing device, the iron and aluminum removal device, the nickel-cobalt precipitation device, the manganese removal device, and the laterite nickel ore hydrometallurgical wastewater thickening device are sequentially connected by pipelines. The outlet end of the laterite nickel ore hydrometallurgical wastewater thickening device is connected to a discharge pipe and a circulation pipe. The discharge pipe extends to the seabed, and the other end of the circulation pipe is connected to the countercurrent washing device. A discharge solenoid valve is installed on the discharge pipe, and a circulation solenoid valve is installed on the circulation pipe. The detection device is installed at the outlet end of the laterite nickel ore hydrometallurgical wastewater thickening device for detecting the turbidity of the laterite nickel ore hydrometallurgical wastewater thickening device. The control device is electrically connected to the detection device, the discharge solenoid valve, and the circulation solenoid valve, and controls the opening and closing of the discharge solenoid valve and the circulation solenoid valve according to the detection result of the detection device.

[0016] Compared with the prior art, the thickening equipment for laterite nickel ore hydrometallurgical wastewater provided in this application includes a buffer device, a flocculation device, and a thickening device. The inlet end of the flocculation device is connected to the buffer device, and the outlet end of the flocculation device is connected to the thickening device. The thickening device includes a thickener, an overflow outlet structure, and an inclined plate sedimentation structure. The thickener is connected to the flocculation device. The overflow outlet structure is fixed above the thickener for discharging the supernatant from the thickener. The inclined plate sedimentation structure is fixed below the overflow outlet structure for promoting the sedimentation of particulate matter in the thickener body. In this application, wastewater is first introduced into a buffer device for buffering, and then introduced into the flocculation device for flocculation treatment. The liquid from the flocculation device is then introduced into the thickening device for thickening. The inclined plate sedimentation structure promotes the sedimentation of particulate matter in the thickener and prevents particulate matter from entering above the inclined plate sedimentation structure. The overflow outlet structure guides the supernatant of the thickener to be discharged. The inclined plate sedimentation structure of this application can guide the sedimentation of particulate matter, thereby significantly reducing the flocculated particles in the overflow liquid and improving the thickening effect.

[0017] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it according to the contents of the specification, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings. The specific implementation methods of this application are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the thickening equipment for laterite nickel ore hydrometallurgical wastewater provided in this application; Figure 2 yes Figure 1 A cross-sectional schematic diagram of the buffer device; Figure 3 yes Figure 1 A top view of the intermediate flocculation unit and the thickening unit; Figure 4 yes Figure 1 Cross-sectional schematic diagram of the flocculation device and the thickening device; Figure 5 This is a schematic diagram of a loop processing system provided in this application.

[0019] Explanation of reference numerals in the attached figures: 1-Buffer device, 11-Pump tank body, 12-Buffer tank stirring device, 121-Buffer tank spanning frame, 122-Buffer tank stirring motor, 123-Buffer tank stirring rod, 124-Buffer tank stirring blade, 13-PAC injection pipe, 2-Flocculation device, 21-Multi-stage overflow structure, 211-First tank body, 212-Second tank body, 213-Third tank body, 22-Transition tank, 23-Flocculation stirring structure, 231-Second tank spanning frame, 232-Second tank stirring motor, 233-Second tank stirring rod, 234-Second tank stirring blade, 3-Thickening device, 31-Thickening machine, 311-Thickening machine tank body, 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, 32-Overflow discharge structure, 321-Discharge trough, 322-Overflow trough, 33-Inclined plate sedimentation structure, 331-Plate, 332-Through hole, 100-Thickening equipment for laterite nickel ore hydrometallurgical wastewater, 200-Countercurrent washing equipment, 300-Iron and aluminum removal equipment, 400-Nitrogen and cobalt immersion equipment, 500-Manganese removal equipment, 600-Detection equipment, 700-Control equipment, 800-Outfall pipeline, 900-Circulation pipeline. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] Please see Figure 1 , Figure 2 This application provides a thickening device 100 for wet metallurgical wastewater from laterite nickel ore, including a buffer device 1, a flocculation device 2, and a thickening device 3. The inlet end of the flocculation device 2 is connected to the buffer device 1, and the outlet end of the flocculation device 2 is connected to the thickening device 3. The thickening device 3 includes a thickener 31, an overflow outlet structure 32, and an inclined plate sedimentation structure 33. The thickener 31 is connected to the flocculation device 2. The overflow outlet structure 32 is fixed above the thickener 31 for discharging the supernatant from the thickener 31. The inclined plate sedimentation structure 33 is fixed below the overflow outlet structure 32 for promoting the sedimentation of particulate matter in the thickener body 31.

[0022] In this application, wastewater is first introduced into the buffer device 1 for buffering, and then introduced into the flocculation device 2 for flocculation treatment. The liquid from the flocculation device 2 is then introduced into the thickening device 3 for thickening. The inclined plate sedimentation structure 33 promotes the sedimentation of particulate matter in the thickener 31 and prevents particulate matter from entering above the inclined plate sedimentation structure 33. The overflow outlet structure 32 guides the supernatant of the thickener 31 to be discharged. The inclined plate sedimentation structure of this application can guide the sedimentation of particulate matter, thereby significantly reducing the flocculated particles in the overflow liquid and improving the thickening effect.

[0023] In this embodiment, 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 and is used to stir the liquid in the buffer tank 11.

[0024] In this embodiment, a PAC filling pipe 13 is provided at the top of the buffer tank 11 for filling the buffer tank 11 with PAC.

[0025] In this embodiment, 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 fixed 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. The buffer tank stirring blade 124 is fixed on the end of the buffer tank stirring rod 123 that extends into the buffer tank body 11.

[0026] In this embodiment, the flocculation device 2 includes a multi-stage overflow structure 21 and a transition tank 22. The multi-stage overflow structure 21 is connected to the buffer device 1 and the transition tank 22. The multi-stage overflow structure 21 is provided with a flocculant addition port. The transition tank 22 is attached and fixed to the thickener 31. An overflow channel is formed at the top of the transition tank 22 to overflow to the thickener 31.

[0027] In this embodiment, 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 and has a flocculant addition port. The first tank 211 is disposed inside the second tank 212 and is connected to the buffer device 1. The liquid in the buffer device 1 first enters the first tank 211 and overflows into the second tank 212. After flocculant is added to the second tank 212, it overflows into the third tank 213 and then flows into the transition tank 22.

[0028] In this embodiment, the transition tank 22 is rectangular and one side is fitted and connected to the baffle side of the thickener 31, and the third tank body 213 is arc-shaped and its bowstring side is fitted and connected to the other side of the transition tank 22.

[0029] In this embodiment, 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 232, 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 fixed to the second tank stirring motor 232, and the other end of the second tank stirring rod 233 extends into the second tank 212. The second tank stirring blade 234 is fixed on the end of the second tank stirring rod 233 that extends into the second tank 212, and the second tank stirring blade 234 is located above the first tank 211.

[0030] In this embodiment, the thickener 31 includes a thickener tank 311, a rake mechanism 312, and a baffle 313. The thickener tank 311 is fitted to the transition tank 22. The baffle 313 is fixed to the upper inner wall of the thickener tank 311, dividing the upper space of the thickener tank 311 into an inlet area 311a and an overflow outlet area 311b. The inlet area 311a is connected to the overflow channel. The overflow outlet structure 32 is disposed in the overflow outlet area 311b and fixed to the baffle 313 and the inner wall of the thickener tank 311. The inclined plate sedimentation structure 33 is disposed in the overflow outlet area 311b and fixed to the baffle 313 and the inner wall of the thickener tank 311. The rake mechanism 312 is fixed on the thickener tank 311 and is used to hang the sediment on the inner wall of the thickener tank 311. In use, the liquid in the transition tank 22 overflows into the water inlet area 311a, is thickened by the thickener, and the precipitate falls onto the thickener tank 311. The clear liquid overflows into the overflow outlet structure 32 and is then discharged. The inclined plate sedimentation structure 33 is located below the overflow outlet structure 32 and can guide the sedimentation of particulate matter, thereby significantly reducing the flocculated particles in the overflow liquid and improving the thickening effect.

[0031] In this embodiment, the ratio of the area of ​​the water inlet region 311a to the area of ​​the overflow outlet region 311b is 1:4~10.

[0032] The rake mechanism 312 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 thickener tank 311. The rake motor 312b is fixed to the rake frame 312a. One end of the rake rotating rod 312c is fixed to the rake motor 312b, and the other end extends into the thickener tank 311. The rake scraper 312d is fixed to the rake rotating rod 312c and abuts against the inner wall of the thickener tank 311. The rake motor 312b drives the rake scraper 312d to rotate, scraping off the sediment on the inner wall of the thickener tank 311 so that it can be discharged from the bottom.

[0033] In this embodiment, the overflow outlet structure 32 includes an outlet channel 321 and a plurality of overflow channels 322. The outlet channel 321 is disposed in the center of the overflow outlet area 311b. One end of the outlet channel 321 is fixed to the inner wall of the sealed tank 311, and the other end extends to the outside of the sealed tank 311. The outlet channel 321 is inclined outward from the sealed tank 311 so that the liquid flows in the direction of the outside of the sealed tank 311. The plurality of overflow channels 322 are arranged on both sides of the outlet channel 321. One end of the overflow channel 322 is fixed to the inner wall of the sealed tank 311, and the other end is fixedly connected to the outlet channel 321. The overflow channel 322 is inclined in the direction of the outlet channel 321 so that the liquid flows in the direction of the outlet channel 321. In the existing technology, the edge overflow mode is used, and the supernatant overflows from the edge of the thickener tank 311. This requires the installation of a ring-shaped receiving device around the thickener tank 311, which has a large footprint and high cost.

[0034] In this embodiment, the inclined plate sedimentation structure 33 includes a plate 331 with a plurality of through holes 332. The through holes 332 are closely arranged and have a honeycomb-like cross-section, and are inclined. The inclined plate sedimentation structure 33 utilizes the principle of "shallow sedimentation" to shorten the particle settling distance, thereby shortening the sedimentation time and increasing the sedimentation area of ​​the sedimentation tank, thus improving the sedimentation efficiency.

[0035] like Figure 5As shown, this application also provides a recycling system, which includes the aforementioned thickening equipment 100 for laterite nickel ore hydrometallurgical wastewater, a countercurrent washing equipment 200, an iron and aluminum removal equipment 300, a nickel-cobalt precipitation equipment 400, a manganese removal equipment 500, a detection equipment 600, and a control equipment 700. The countercurrent washing equipment 200, the iron and aluminum removal equipment 300, the nickel-cobalt precipitation equipment 400, the manganese removal equipment 500, and the laterite nickel ore hydrometallurgical wastewater thickening equipment are sequentially connected by pipelines. The outlet end of the laterite nickel ore hydrometallurgical wastewater thickening equipment is connected to a discharge pipe 800 and a circulation pipe 900. The discharge pipe 800... Extending towards the sea surface, the other end of the circulation pipe 900 is connected to the countercurrent scrubbing device 200. A discharge solenoid valve is installed on the discharge pipe 800, and a circulation solenoid valve is installed on the circulation pipe 900. A detection device 600 is installed at the outlet of the laterite nickel ore hydrometallurgical wastewater thickening device to detect the turbidity of the wastewater. A control device 700 is electrically connected to the detection device 600, the discharge solenoid valve, and the circulation solenoid valve, and controls the opening and closing of the discharge and circulation solenoid valves based on the detection results of the detection device 600. If the detection results of the detection device 600 meet the discharge standards, the discharge solenoid valve is opened and the circulation solenoid valve is closed for direct discharge into the sea. If the detection results of the detection device 600 do not meet the discharge standards, the discharge solenoid valve is closed and the circulation solenoid valve is opened for recirculation treatment until the discharge standards are met.

[0036] 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 conventional equipment in the art and are well known to those skilled in the art. Therefore, they will not be described in detail here.

[0037] In this embodiment, the detection device 600 is a turbidimeter.

[0038] To better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings: Waste liquid is introduced into buffer device 1 for buffering. PAC is added into buffer tank 11 by PAC injection pipe 13. Buffer tank stirring device 12 stirs the PAC to achieve homogenization in buffer device 1. Then, it is introduced into first tank 211 and overflows into second tank 212. Flocculant is added to second tank 212. Flocculation stirring structure 23 stirs the liquid in second tank 212 to fully react the flocculant with the substance. Then, it overflows into third tank 213 and flows into transition tank 22, where it gradually accumulates. Finally, it overflows into thickener tank 311. The precipitate gradually settles in thickener tank 311. The inclined plate sedimentation structure 33 uses the principle of "shallow sedimentation" to shorten the particle settling distance, thereby shortening the sedimentation time and preventing the precipitate from reaching the overflow outlet structure 32 through the inclined plate sedimentation structure 33, thus reducing particulate matter in the overflow liquid and improving the thickening effect.

[0039] The beneficial effects of this application are as follows: The thickening equipment for laterite nickel ore hydrometallurgical wastewater provided by this application includes a buffer device, a flocculation device, and a thickening device. The inlet end of the flocculation device is connected to the buffer device, and the outlet end of the flocculation device is connected to the thickening device. The thickening device includes a thickener, an overflow outlet structure, and an inclined plate sedimentation structure. The thickener is connected to the flocculation device. The overflow outlet structure is fixed above the thickener for discharging the supernatant from the thickener. The inclined plate sedimentation structure is fixed below the overflow outlet structure for promoting the sedimentation of particulate matter in the thickener body. In this application, wastewater is first introduced into a buffer device for buffering, and then introduced into the flocculation device for flocculation treatment. The liquid from the flocculation device is then introduced into the thickening device for thickening. The arc-shaped third tank 213 and the rectangular transition tank 22 cooperate with the thickener 31 to achieve overflow water intake, causing the water flow direction to undulate up and down, forming an S-shaped flow channel to promote sedimentation. In addition, the liquid inlet at the bottom of the transition tank 22 is a through hole, but its outlet is a surface overflow, that is, the outlet cross-section is much larger than the inlet cross-section. This makes the water flow from the transition tank 22 to the thickener 31 very calm and with little impact, which helps the thickener to better flocculate and settle, and improves the flocculation and sedimentation effect of the thickener. The inclined plate sedimentation structure promotes the sedimentation of particulate matter in the thickener and prevents particulate matter from entering above the inclined plate sedimentation structure. The overflow outlet structure guides the supernatant of the thickener to be discharged. The inclined plate sedimentation structure of this application can guide the sedimentation of particulate matter, thereby significantly reducing the flocculated particles in the overflow liquid and improving the thickening effect.

[0040] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A laterite nickel ore hydrometallurgical wastewater thickening apparatus, characterized in that, It comprises: a buffer device; a flocculation device, the liquid inlet end of which is communicated with the buffer device; and a thickening device, comprising a thickener, an overflow leading structure and an inclined plate sedimentation structure, the upper part of the thickener is formed with a water inlet area and an overflow water outlet area, the water inlet area extends into the flocculation device and is communicated with the upper part of the flocculation device, the overflow leading structure is embedded in the upper side of the overflow water outlet area of the thickener and is used for leading the supernatant of the thickener, the inclined plate sedimentation structure is fixed below the overflow leading structure and is used for promoting the sedimentation of particles in the main body of the thickener; wherein the height of the water inlet area is lower than that of the overflow water outlet area.

2. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 1, characterized in that, The thickener comprises a thickener tank body, a rake mechanism and a baffle, the baffle is fixed with the inner wall of the upper part of the thickener tank body, the upper space of the thickener tank body is divided into the water inlet area and the overflow water outlet area, and the rake mechanism is fixed on the thickener tank body and is used for scraping off the sediment on the inner wall of the thickener tank body.

3. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 2, characterized in that, The overflow leading structure comprises a leading groove body and a plurality of overflow groove bodies, the leading groove body is arranged in the center of the overflow water outlet area, one end of the leading groove body is fixedly connected with the baffle, the other end extends to the outside of the thickener tank body, and the plurality of overflow groove bodies are arranged on both sides of the leading groove body, one end of each overflow groove body is fixedly connected with the inner wall of the thickener tank body, and the other end is fixedly communicated with the leading groove body.

4. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 1, characterized in that, The inclined plate sedimentation structure comprises a plate body, a plurality of through holes are arranged on the plate body, the through holes are closely arranged and have a honeycomb-shaped cross section, and the through holes are arranged obliquely.

5. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 2, characterized in that, The rake mechanism comprises a rake cross frame, a rake motor, a rake rotating rod and a rake scraper, the rake cross frame is arranged across the thickener tank body, the rake motor is fixed on the rake cross frame, one end of the rake rotating rod is fixed with the rake motor, the other end extends into the thickener tank body, and the rake scraper is fixed with the rake rotating rod and abuts against the inner wall of the thickener tank body.

6. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 2, characterized in that, The flocculation device comprises a multi-stage overflow structure and a transition tank, the multi-stage overflow structure is communicated with the buffer device and the transition tank, the multi-stage overflow structure is provided with a flocculant adding port, the transition tank is connected with one side of the opposite baffle of the thickener, and the overflow area of the thickener extends into the transition tank.

7. The laterite nickel ore hydrometallurgy wastewater thickener apparatus according to claim 6, characterized in that, The multi-stage overflow structure comprises a first tank body, a second tank body and a third tank body, the third tank body is communicated with the bottom of the transition tank, the second tank body is arranged in the third tank body and has a height lower than that of the third tank body, the second tank body is provided with a flocculant adding port, and the first tank body is arranged in the second tank body and its bottom is communicated with the bottom of the buffer device.

8. The laterite nickel ore hydrometallurgy wastewater thickening apparatus according to claim 7, characterized in that, The flocculation device further comprises a flocculation stirring structure, the flocculation stirring structure comprises a second tank cross frame, a second tank stirring motor, a second tank stirring rod and a second tank stirring blade, the second tank cross frame is arranged on the second tank, the second tank stirring motor is fixed on the second tank cross frame, one end of the second tank stirring rod is fixed with the second tank stirring motor, the other end of the second tank stirring rod extends into the second tank, and the second tank stirring blade is fixed on one end of the second tank stirring rod extending into the second tank.

9. The laterite nickel ore hydrometallurgy wastewater thickener apparatus according to claim 1, characterized in that, The buffer device comprises a buffer tank and a buffer tank stirring device, the buffer tank is provided with a liquid inlet at the top and a liquid outlet at the bottom, the liquid outlet is communicated with the flocculation device, a PAC filling pipe is arranged at the top of the buffer tank for filling PAC into the buffer tank, and the buffer tank stirring device is fixed above the buffer tank for stirring the liquid in the buffer tank.

10. A recycling system, characterized by, Comprise: The laterite nickel ore hydrometallurgy wastewater thickening equipment, the countercurrent washing equipment, the iron and aluminum removal equipment, the nickel and cobalt precipitation equipment, the manganese removal equipment, the detection equipment and the control equipment according to any one of claims 1-9, the countercurrent washing equipment, the iron and aluminum removal equipment, the nickel and cobalt precipitation equipment and the manganese removal equipment are sequentially connected by pipelines, a sea discharge pipeline and a circulating pipeline are connected to the liquid outlet of the laterite nickel ore hydrometallurgy wastewater thickening equipment, the sea discharge pipeline extends to the seabed, the other end of the circulating pipeline is connected with the countercurrent washing equipment, a sea discharge electromagnetic valve is arranged on the sea discharge pipeline, a circulating electromagnetic valve is arranged on the circulating pipeline, the detection equipment is arranged at the liquid outlet of the laterite nickel ore hydrometallurgy wastewater thickening equipment, and is used for detecting the turbidity of the laterite nickel ore hydrometallurgy wastewater thickening equipment, and the control equipment is electrically connected with the detection equipment, the sea discharge electromagnetic valve and the circulating electromagnetic valve, and the opening and closing of the sea discharge electromagnetic valve and the circulating electromagnetic valve are controlled according to the detection result of the detection equipment.

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