Waste thickening equipment and recycling treatment system for laterite nickel ore hydrometallurgical wastewater

Abstract

This application discloses a waste thickening equipment for laterite nickel ore hydrometallurgical wastewater, which includes a buffering device, a flocculation device, and a thickening device. The influent end of the flocculation device is connected to the buffering device, and the effluent end of the flocculation device is connected to the thickening device. The thickening device comprises a thickener, an overflow discharge structure, and an inclined plate sedimentation structure. The thickener is in communication with the flocculation device. The overflow discharge structure is fixed above the thickener and is used to discharge the supernatant liquid from the thickener. The inclined plate sedimentation structure is fixed below the overflow discharge structure and is used to promote the sedimentation of particulate matter in the thickener. The inclined plate sedimentation structure facilitates the sedimentation of particulate matter in the thickener, preventing the particles from entering above the inclined plate sedimentation structure. The overflow discharge structure guides the supernatant liquid from the thickener, and the inclined plate sedimentation structure of this application can guide the sedimentation of particles, thereby significantly reducing the flocculent particles in the overflow liquid and improving the thickening effect.

Description

[0001] Description

[0002] WASTE THICKENING EQUIPMENT AND RECYCLING TREATMENT SYSTEM FOR LATERITE NICKEL ORE HYDROMETALLURGICAL WASTEWATER

[0003] FILED OF THE DISCLOSURE

[0004] This application relates to the field of hydrometallurgical technology, specifically to a waste thickening equipment and recycling treatment system for laterite nickel ore hydrometallurgical wastewater.

[0005] BACKGROUND

[0006] Laterite nickel ore is a loose, clay-like, multi-mineral aggregate formed from the weathering, leaching, infiltration, and alteration of olivine-based rocks in tropical or subtropical regions, accompanied by metal components such as nickel, cobalt, chromium, magnesium, and aluminum. Currently, in the hydrometallurgical process of laterite nickel ore, the wastewater contains a small amount of flocculants, and the existing technology mostly uses thickeners with flocculant treatment .

[0007] For example, patent CN212151911U provides a mineral processing wastewater deep treatment and recycling device, which includes a stirring pool, a steady flow pool, a thickener, a sedimentation pool, and a storage pool. The bottom of the stirring pool is connected to the bottom of the steady flow pool, the top of the steady flow pool is connected to the thickener through a pipeline, the thickener is connected to the sedimentation pool through a pipeline, and the sedimentation pool is connected to the storage pool. The return water enters the stirring pool, and after stirring in the stirring pool, the water overflows from the steady flow pool and enters the thickener. After the first sedimentation in the thickener, the water overflows and enters the sedimentation pool, and after the second sedimentation in the sedimentation pool, the water enters the storage pool.

[0008] However, the problem is that the thickener has poor treatment effect on wastewater with fine and low content solid particles, which makes it difficult for the wastewater treated by the thickener to meet the discharge standards.

[0009] SUMMARY

[0010] The purpose of this application is to overcome the above technical deficiencies and propose a waste thickening equipment and recycling treatment system for laterite nickel ore hydrometallurgical wastewater, solving the technical problem that the thickener does not meet the standard in the existing technology .

[0011] To achieve the above technical purpose, this application adopts the following technical solution:

[0012] This application provides a waste thickening equipment for laterite nickel ore hydrometallurgical wastewater, including:

[0013] A buffering device;

[0014] A flocculation device, the influent end of which is connected to the buffering device; and

[0015] A thickening device, including a thickener, an overflow discharge structure, and an inclined plate sedimentation structure, the thickener having an inlet area and an overflow outlet area formed above, the inlet area extending into the flocculation device and connected to the upper part of the flocculation device, the overflow discharge structure built- in above the overflow outlet area of the thickener, used for discharging the supernatant liquid from the thickener, the inclined plate sedimentation structure fixed below the overflow discharge structure, used for promoting the sedimentation of particulate matter in the main body of the thickener; wherein, the height of the inlet area is lower than that of the overflow outlet area. In some embodiments, the thickener includes a thickener tank, a raking mechanism, and a baffle, the baffle being fixed to the upper inner wall of the thickener tank, dividing the upper space of the thickener tank into the inlet area and the overflow outlet area, the raking mechanism being fixed on the thickener tank, used for scraping off the sediment on the inner wall of the thickener tank.

[0016] In some embodiments, the overflow discharge structure includes a discharge trough and a plurality of overflow troughs, the discharge trough being located in the center of the overflow outlet area, one end of the discharge trough being fixedly connected to the baffle, the other end extending outside the thickener tank, a plurality of overflow troughs being arranged on both sides of the discharge trough, each overflow trough having one end fixedly connected to the inner wall of the thickener tank, the other end being fixedly connected to the discharge trough.

[0017] In some embodiments, the inclined plate sedimentation structure includes a plate body, the plate body having a plurality of through-holes, the through-holes being closely arranged and having a honeycomb-shaped cross-section, the through-holes being inclined.

[0018] In some embodiments, the raking mechanism includes a raking frame, a raking motor, a raking rotating rod, and a raking blade, the raking frame being straddled on the thickener tank, the raking motor being fixed on the raking frame, one end of the raking rotating rod being fixed to the raking motor, the other end extending into the thickener tank, the raking blade being fixed to the raking rotating rod and in contact with the inner wall of the thickener tank.

[0019] In some embodiments, the flocculation device includes a multi-stage overflow structure and a transition tank, the multi-stage overflow structure being connected to the buffering device and the transition tank, the multi-stage overflow structure having a flocculant addition port, the transition tank being connected to one side of the thickener opposite the baffle, and the overflow area of the thickener extending into the transition tank.

[0020] In some embodiments, the multi-stage overflow structure includes a first tank, a second tank, and a third tank, the third tank being connected to the bottom of the transition tank, the second tank being located inside the third tank and lower than the third tank, the second tank having a flocculant addition port, the first tank being located inside the second tank and its bottom connected to the bottom of the buffering device .

[0021] In some embodiments, the flocculation device further includes a flocculation stirring structure, the flocculation stirring structure including a second tank cross-beam, a second tank stirring motor, a second tank stirring rod, and a second tank stirring blade, the second tank cross-beam being straddled on the second tank, the second tank stirring motor being fixed on the second tank cross-beam, one end of the second tank stirring rod being fixed to the second tank stirring motor, the other end of the second tank stirring rod extending into the second tank, the second tank stirring blade being fixed to one end of the second tank stirring rod extending into the second tank, the second tank stirring blade being located above the first tank.

[0022] In some embodiments, the buffering device includes a buffer tank and a buffer tank stirring device, the buffer tank having an inlet at the top, an outlet at the bottom connected to the flocculation device, a PAG injection pipe at the top for injecting PAG into the buffer tank, the buffer tank stirring device being fixed above the buffer tank for stirring the liquid in the buffer tank.

[0023] This application also provides a recycling treatment system, including: any one of the claims 1-9 described laterite nickel ore hydrometallurgical wastewater thickening equipment, countercurrent washing equipment, iron and aluminum removal equipment, nickel and cobalt precipitation equipment, manganese removal equipment, detection equipment, and control equipment, the countercurrent washing equipment, the iron and aluminum removal equipment, the nickel and cobalt precipitation equipment, the manganese removal equipment, and the laterite nickel ore hydrometallurgical wastewater thickening equipment are connected in series by pipelines, the effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment is connected to a sea discharge pipeline and a recycling pipeline, the sea discharge pipeline extends to the seabed, the recycling pipeline is connected to the countercurrent washing equipment at the other end, a sea discharge solenoid valve is set on the sea discharge pipeline, a recycling solenoid valve is set on the recycling pipeline, the detection equipment is set at the effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment for detecting the turbidity of the laterite nickel ore hydrometallurgical wastewater thickening equipment, the control equipment is electrically connected to the detection equipment, the sea discharge solenoid valve, and the recycling solenoid valve, and controls the opening and closing of the sea discharge solenoid valve and the recycling solenoid valve according to the detection results of the detection equipment.

[0024] Compared with existing technology, the waste thickening equipment for laterite nickel ore hydrometallurgical wastewater provided by this application includes a buffering device, a flocculation device, and a thickening device. The influent end of the flocculation device is connected to the buffering device, and the effluent end of the flocculation device is connected to the thickening device. The thickening device includes a thickener, an overflow discharge structure, and an inclined plate sedimentation structure. The thickener is in communication with the flocculation device. The overflow discharge structure is fixed above the thickener and is used to discharge the supernatant liquid from the thickener. The inclined plate sedimentation structure is fixed below the overflow discharge structure and is used to promote the sedimentation of particulate matter in the main body of the thickener. In this application, first, the wastewater is introduced into the buffering device for buffering, then into the flocculation device for flocculation treatment, and then into the thickening device for thickening. The inclined plate sedimentation structure promotes the sedimentation of particulate matter in the thickener, preventing the particles from entering above the inclined plate sedimentation structure. The overflow discharge structure guides the supernatant liquid from the thickener, and the inclined plate sedimentation structure of this application can guide the sedimentation of particles, thereby significantly reducing the flocculent particles in the overflow liquid and improving the thickening effect .

[0025] The above description is only an overview of the technical solution of this application. For a clearer understanding of the technical means of this application and to implement it according to the content of the specification, the best embodiment of this application and its detailed description are given below in conjunction with the drawings. The specific implementation of this application is detailed in the following examples and drawings.

[0026] BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic diagram of the structure of the laterite nickel ore hydrometallurgical wastewater thickening equipment provided in this application;

[0028] FIG. 2 is a cross-sectional view of the buffering device in Figure 1;

[0029] FIG. 3 is a top view diagram of the flocculation device and the thickening device in Figure 1;

[0030] FIG. 4 is a cross-sectional view of the flocculation device and the thickening device in Figure 1;

[0031] FIG. 5 is a module diagram of a recycling treatment system provided in this application.

[0032] Note on the attached drawings : 1-Buffering device, 11-Buffer tank, 12-Buffer tank stirring device, 121-Buffer tank crossbeam, 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, 212-Second tank, 213- Third tank, 22-Transition tank, 23-Flocculation stirring structure, 231-Second tank crossbeam, 232-Second tank stirring motor, 233-Second tank stirring rod, 234-Second tank stirring blade, 3-Thickening device, 31-Thickener , 311 -Thickener tank, 311a-Inlet area, 31 Ib-Over f low outlet area, 312-Raking mechanism, 312a-Raking frame, 312b-Raking motor, 312c-Raking rotating rod, 312d-Raking blade, 313-Baffle, 32-Overflow discharge structure, 321-Discharge trough, 322-Overflow trough, 33-Inclined plate sedimentation structure, 331-Plate body, 332-Through-hole, 100-Laterite nickel ore hydrometallurgical wastewater thickening equipment, 200 -Countercurrent washing equipment, 300-Iron and aluminum removal equipment, 400-Nickel and cobalt precipitation equipment, 500-Manganese removal equipment, 600-Detection equipment, 700-Control equipment, 800-Sea discharge pipeline, 900-Recycling pipeline.

[0033] DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0034] To make the purpose, technical solution, and advantages of this application more clear and understandable, the following further detailed description of this application is combined with the drawings and embodiments. It should be understood that the specific embodiments described here are only for explaining this application and do not limit this application.

[0035] Refer to Figure 1 and Figure 2; this application provides a waste thickening equipment for laterite nickel ore hydrometallurgical wastewater, including a buffering device 1, a flocculation device 2, and a thickening device 3. The influent end of the flocculation device 2 is connected to the buffering device 1, and the effluent end of the flocculation device 2 is connected to the thickening device 3. The thickening device 3 includes a thickener 31, an overflow discharge structure 32, and an inclined plate sedimentation structure 33. The thickener 31 is in communication with the flocculation device 2. The overflow discharge structure 32 is fixed above the thickener 31 and is used to discharge the supernatant liquid from the thickener 31. The inclined plate sedimentation structure 33 is fixed below the overflow discharge structure 32 and is used to promote the sedimentation of particulate matter in the main body of the thickener 31.

[0036] In this application, wastewater is first introduced into the buffering device 1 for buffering, then introduced into the flocculation device 2 for flocculation treatment, and then into the thickening device 3 for thickening. The inclined plate sedimentation structure 33 promotes the sedimentation of particulate matter in the thickener 31, preventing the particles from entering above the inclined plate sedimentation structure 33. The overflow discharge structure 32 guides the supernatant liquid from the thickener 31, and the inclined plate sedimentation structure of this application can guide the sedimentation of particles, thereby significantly reducing the flocculent particles in the overflow liquid and improving the thickening effect.

[0037] In this embodiment, the buffering device 1 includes a buffer tank 11 and a buffer tank stirring device 12. The buffer tank

[0038] 11 has an inlet at the top and an outlet at the bottom connected to the flocculation device 2. The buffer tank stirring device

[0039] 12 is fixed above the buffer tank 11 and is used to stir the liquid in the buffer tank 11.

[0040] In this embodiment, the buffer tank 11 has a PAG injection pipe 13 at the top for injecting PAG into the buffer tank 11.

[0041] In this embodiment, the buffer tank stirring device 12 includes a buffer tank crossbeam 121, a buffer tank stirring motor 122, a buffer tank stirring rod 123, and a buffer tank stirring blade 124. The buffer tank crossbeam 121 is straddled on the buffer tank 11, the buffer tank stirring motor 122 is fixed on the buffer tank crossbeam 121, one end of the buffer tank stirring rod 123 is fixed to the buffer tank stirring motor 122, the other end of the buffer tank stirring rod 123 extends into the buffer tank 11, and the buffer tank stirring blade 124 is fixed to the buffer tank stirring rod 123 and extends into the buffer tank 11.

[0042] 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 buffering device 1 and the transition tank 22. The multi-stage overflow structure 21 has a flocculant addition port, and the transition tank 22 is connected to one side of the thickener 31 opposite the baffle. The overflow area of the thickener extends into the transition tank 22.

[0043] 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 bottom of the transition tank 22, the second tank 212 is located inside the third tank 213 and lower than the third tank 213, the second tank 212 has a flocculant addition port, and the first tank 211 is located inside the second tank 212 and its bottom is connected to the bottom of the buffering device 1. The liquid in the buffering device 1 first enters the first tank 211, overflows into the second tank 212, the second tank 212 adds a flocculant, overflows into the third tank 213, and flows into the transition tank 22.

[0044] In this embodiment, the transition tank 22 is rectangular and one side is connected to the baffle side of the thickener 31, and the third tank 213 is arch-shaped and its arched side is connected to the other side of the transition tank 22.

[0045] In this embodiment, the flocculation device 2 also includes a flocculation stirring structure 23, which includes a second tank crossbeam 231, a second tank stirring motor 232, a second tank stirring rod 233, and a second tank stirring blade 234. The second tank crossbeam 231 is straddled on the second tank 212, the second tank stirring motor 232 is fixed on the second tank crossbeam 231, one end of the second tank stirring rod 233 is fixed to the second tank stirring motor 232, the other end of the second tank stirring rod 233 extends into the second tank 212, and the second tank stirring blade 234 is fixed to one end of the second tank stirring rod 233 extending into the second tank 212, and the second tank stirring blade 234 is located above the first tank 211.

[0046] In this embodiment, the thickener 31 includes a thickener tank 311, a raking mechanism 312, and a baffle 313. The thickener tank 311 is in close contact with 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 the inlet area 311a and the overflow outlet area 311b. The inlet area 311a is connected to the overflow channel, the overflow discharge structure 32 is set within the overflow outlet area 311b and is fixed to the baffle 313 and the inner wall of the thickener tank 311, and the inclined plate sedimentation structure 33 is set within the overflow outlet area 311b and is fixed to the baffle 313 and the inner wall of the thickener tank 311. The raking mechanism 312 is fixed on the thickener tank 311 and is used to scrape off the sediment on the inner wall of the thickener tank 311. When in use, the liquid in the transition tank 22 overflows into the inlet area 311a, undergoes thickening in the thickener 31, the sediment falls to the bottom of the thickener tank 311, and the clear liquid overflows into the overflow discharge structure 32 and is discharged. The inclined plate sedimentation structure 33 is set below the overflow discharge structure 32 and can guide the sedimentation of particles, thereby significantly reducing the particles in the overflow liquid and improving the thickening effect.

[0047] In this embodiment, the area ratio of the inlet area 311a to the overflow outlet area 311b is l:4~10.

[0048] The raking mechanism 312 includes a raking frame 312a, a raking motor 312b, a raking rotating rod 312c, and a raking blade 312d. The raking frame 312a is straddled on the thickener tank 311, the raking motor 312b is fixed on the raking frame 312a, one end of the raking rotating rod 312c is fixed to the raking motor 312b, the other end extends into the thickener tank 311, and the raking blade 312d is fixed to the raking rotating rod 312c and is in contact with the inner wall of the thickener tank 311. The raking motor 312b drives the raking blade 312d to rotate, scraping off the sediment on the inner wall of the thickener tank 311 to allow it to be discharged from the bottom.

[0049] In this embodiment, the overflow discharge structure 32 includes a discharge trough 321 and a plurality of overflow troughs 322. The discharge trough 321 is located in the center of the overflow outlet area 311b, one end of the discharge trough 321 is fixed to the inner wall of the thickener tank 311, the other end extends outside the thickener tank 311, and the discharge trough 321 is inclined towards the outside of the thickener tank 311 to allow the liquid to flow in the direction outside the thickener tank 311; a plurality of overflow troughs 322 are arranged on both sides of the discharge trough 321, one end of each overflow trough 322 is fixed to the inner wall of the thickener tank 311, and the other end is fixedly connected to the discharge trough 321, and the overflow troughs 322 are inclined towards the discharge trough 321 to allow the liquid to flow in the direction of the discharge trough 321. In existing technology, the edge overflow mode is used, where the supernatant liquid overflows from the edge of the thickener tank 311, which requires a circular receiving device around the thickener tank 311, resulting in large equipment footprint and high cost.

[0050] In this embodiment, the inclined plate sedimentation structure 33 includes a plate body 331, which has a plurality of through-holes 332. The through-holes 332 are closely arranged and have a honeycomb-shaped cross-section, and the through-holes 332 are inclined. The inclined plate sedimentation structure 33 uses the "shallow sedimentation" principle to shorten the sedimentation distance of particles, thereby shortening the sedimentation time and increasing the sedimentation area of the sedimentation tank, thus improving the sedimentation efficiency.

[0051] As shown in Figure 5, this application also provides a recycling treatment system, which includes the above-described laterite nickel ore hydrometallurgical wastewater thickening equipment 100, countercurrent washing equipment 200, iron and aluminum removal equipment 300, nickel and cobalt precipitation equipment 400, manganese removal equipment 500, detection equipment 600, and control equipment 700. The countercurrent washing equipment 200, iron and aluminum removal equipment 300, nickel and cobalt precipitation equipment 400, manganese removal equipment 500, and laterite nickel ore hydrometallurgical wastewater thickening equipment are connected in series by pipelines. The effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment is connected to a sea discharge pipeline 800 and a recycling pipeline 900. The sea discharge pipeline 800 extends to the seabed, and the recycling pipeline 900 is connected to the countercurrent washing equipment 200 at the other end. A sea discharge solenoid valve is set on the sea discharge pipeline 800, and a recycling solenoid valve is set on the recycling pipeline 900. The detection equipment 600 is set at the effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment for detecting the turbidity of the laterite nickel ore hydrometallurgical wastewater thickening equipment. The control equipment 700 is electrically connected to the detection equipment 600, the sea discharge solenoid valve, and the recycling solenoid valve, and controls the opening and closing of the sea discharge solenoid valve and the recycling solenoid valve according to the detection results of the detection equipment 600. When the detection results of the detection equipment 600 meet the discharge standards, the sea discharge solenoid valve is opened and the recycling solenoid valve is closed for direct discharge; if the detection results of the detection equipment 600 do not meet the discharge standards, the sea discharge solenoid valve is closed and the recycling solenoid valve is opened for recycling treatment until they meet the discharge standards.

[0052] The countercurrent washing equipment 200, iron and aluminum removal equipment 300, nickel and cobalt precipitation equipment 400, and manganese removal equipment 500 are conventional equipment in this field and are well known to those skilled in the art. Therefore, they are not described in detail here.

[0053] In this embodiment, the detection equipment 600 is a turbidity meter.

[0054] To better understand this application, the technical solution of this application is described in detail below in conjunction with the drawings:

[0055] Waste liquid is introduced into the buffering device 1 for buffering, the PAG injection pipe 13 injects PAG into the buffer tank 11, and the buffer tank stirring device 12 stirs to achieve uniformization of PAG in the buffering device 1. Then, it is introduced into the first tank 211, then overflows into the second tank 212, where a flocculant is added. The flocculation stirring structure 23 stirs the liquid in the second tank 212, allowing the flocculant to fully react with the substances, then overflows into the third tank 213, and flows into the transition tank 22. In the transition tank 22, it gradually accumulates and eventually overflows into the thickener tank 311. The sediment gradually settles in the thickener tank 311, and the inclined plate sedimentation structure 33 uses the "shallow sedimentation" principle to shorten the sedimentation distance of particles, thereby shortening the sedimentation time and preventing the sediment from passing through the inclined plate sedimentation structure 33 into the overflow discharge structure 32, thus reducing the particulate matter in the overflow liquid and improving the thickening effect.

[0056] The beneficial effects of this application are: the waste thickening equipment for laterite nickel ore hydrometallurgical wastewater provided by this application includes a buffering device, a flocculation device, and a thickening device. The influent end of the flocculation device is connected to the buffering device, and the effluent end of the flocculation device is connected to the thickening device. The thickening device includes a thickener, an overflow discharge structure, and an inclined plate sedimentation structure. The thickener is in communication with the flocculation device. The overflow discharge structure is fixed above the thickener and is used to discharge the supernatant liquid from the thickener. The inclined plate sedimentation structure is fixed below the overflow discharge structure and is used to promote the sedimentation of particulate matter in the main body of the thickener. In this application, wastewater is first introduced into the buffering device for buffering, then into the flocculation device for flocculation treatment, and then into the thickening device for thickening. The archshaped third tank 213 and the rectangular transition tank 22 cooperate with the thickener 31 to achieve overflow water entry, making the flow direction of the water rise and fall, forming an S-shaped flow channel; to promote sedimentation; in addition, the bottom of the transition tank 22 for liquid entry is a through-hole, but its discharge is a surface overflow, that is, the discharge cross-sectional area is much larger than the water intake cross-sectional area, which makes the water flowing from the transition tank 22 to the thickener 31 very calm, with little impact, which is conducive to better flocculation sedimentation of the thickener, improving the flocculation sedimentation effect of the thickener; the inclined plate sedimentation structure promotes the sedimentation of particulate matter in the thickener, preventing the particles from entering above the inclined plate sedimentation structure. The overflow discharge structure guides the supernatant liquid from the thickener, and the inclined plate sedimentation structure of this application can guide the sedimentation of particles, thereby significantly reducing the flocculent particles in the overflow liquid and improving the thickening effect.

[0057] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding modifications and transformations made based on the technical concepts of this application should be included within the scope of protection of the claims of this application .

Claims

WHAT IS CLAIMED IS1. Waste thickening equipment for laterite nickel ore hydrometallurgical wastewater, characterized by comprising:A buffering device;A flocculation device, the influent end of which is connected to the buffering device; andA thickening device, including a thickener, an overflow discharge structure, and an inclined plate sedimentation structure, the thickener having an inlet area and an overflow outlet area formed above, the inlet area extending into the flocculation device and connected to the upper part of the flocculation device, the overflow discharge structure built- in above the overflow outlet area of the thickener, used for discharging the supernatant liquid from the thickener, the inclined plate sedimentation structure fixed below the overflow discharge structure, used for promoting the sedimentation of particulate matter in the main body of the thickener; wherein, the height of the inlet area is lower than that of the overflow outlet area.

2. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 1, characterized in that the thickener comprises a thickener tank, a raking mechanism, and a baffle, the baffle being fixed to the upper inner wall of the thickener tank, dividing the upper space of the thickener tank into the inlet area and the overflow outlet area, the raking mechanism being fixed on the thickener tank, used for scraping off the sediment on the inner wall of the thickener tank.

3. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 2, characterized in that the overflow discharge structure comprises a discharge trough and a plurality of overflow troughs, the discharge trough being located in the center ofthe overflow outlet area, one end of the discharge trough being fixedly connected to the baffle, the other end extending outside the thickener tank, a plurality of overflow troughs being arranged on both sides of the discharge trough, each overflow trough having one end fixedly connected to the inner wall of the thickener tank, the other end being fixedly connected to the discharge trough.

4. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 1, characterized in that the inclined plate sedimentation structure comprises a plate body, the plate body having a plurality of through-holes, the through-holes being closely arranged and having a honeycomb-shaped cross-section, the through-holes being inclined.

5. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 2, characterized in that the raking mechanism comprises a raking frame, a raking motor, a raking rotating rod, and a raking blade, the raking frame being straddled on the thickener tank, the raking motor being fixed on the raking frame, one end of the raking rotating rod being fixed to the raking motor, the other end extending into the thickener tank, the raking blade being fixed to the raking rotating rod and in contact with the inner wall of the thickener tank.

6. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 2, characterized in that the flocculation device includes a multistage overflow structure and a transition tank, the multistage overflow structure being connected to the buffering device and the transition tank, the multi-stage overflow structure having a flocculant addition port, the transition tank being connected to one side of the thickener opposite thebaffle, and the overflow area of the thickener extending into the transition tank.

7. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 6, characterized in that the multi-stage overflow structure includes a first tank, a second tank, and a third tank, the third tank being connected to the bottom of the transition tank, the second tank being located inside the third tank and lower than the third tank, the second tank having a flocculant addition port, the first tank being located inside the second tank and its bottom connected to the bottom of the buffering device .

8. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 7, characterized in that the flocculation device further includes a flocculation stirring structure, the flocculation stirring structure including a second tank cross-beam, a second tank stirring motor, a second tank stirring rod, and a second tank stirring blade, the second tank cross-beam being straddled on the second tank, the second tank stirring motor being fixed on the second tank cross-beam, one end of the second tank stirring rod being fixed to the second tank stirring motor, the other end of the second tank stirring rod extending into the second tank, the second tank stirring blade being fixed to one end of the second tank stirring rod extending into the second tank, the second tank stirring blade being located above the first tank .

9. The waste thickening equipment for laterite nickel ore hydrometallurgical wastewater as claimed in claim 1, characterized in that the buffering device includes a buffer tank and a buffer tank stirring device, the buffer tank having an inlet at the top, an outlet at the bottom connected to the flocculation device, a PAG injection pipe at the top forinjecting PAG into the buffer tank, the buffer tank stirring device being fixed above the buffer tank for stirring the liquid in the buffer tank.

10. recycling treatment system, characterized by comprising: any one of the claims 1-9 described laterite nickel ore hydrometallurgical wastewater thickening equipment, countercurrent washing equipment, iron and aluminum removal equipment, nickel and cobalt precipitation equipment, manganese removal equipment, detection equipment, and control equipment, the countercurrent washing equipment, the iron and aluminum removal equipment, the nickel and cobalt precipitation equipment, the manganese removal equipment, and the laterite nickel ore hydrometallurgical wastewater thickening equipment are connected in series by pipelines, the effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment is connected to a sea discharge pipeline and a recycling pipeline, the sea discharge pipeline extends to the seabed, the recycling pipeline is connected to the countercurrent washing equipment at the other end, a sea discharge solenoid valve is set on the sea discharge pipeline, a recycling solenoid valve is set on the recycling pipeline, the detection equipment is set at the effluent end of the laterite nickel ore hydrometallurgical wastewater thickening equipment for detecting the turbidity of the laterite nickel ore hydrometallurgical wastewater thickening equipment, the control equipment is electrically connected to the detection equipment, the sea discharge solenoid valve, and the recycling solenoid valve, and controls the opening and closing of the sea discharge solenoid valve and the recycling solenoid valve according to the detection results of the detection equipment.

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