A multi-stage overflow tank for wastewater from hydrometallurgical treatment of laterite nickel ore

Abstract

This application discloses a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater, comprising an inlet tank and two overflow tank groups. The inlet tank has two overflow outlet gates. The two overflow tank groups are arranged side by side, and each overflow tank group includes multiple overflow tanks arranged longitudinally. The multiple overflow tanks of each overflow tank group are connected end to end through overflow outlets, and the overflow tank at the first end along the water flow direction is connected to the overflow outlet gate. Each overflow tank includes two overflow tank bodies arranged laterally and connected at the bottom. This application connects the two overflow tank groups through the inlet tank to form two overflow paths. Each overflow path, with the cooperation of bottom-connected and end-to-end connected overflow outlets, forms an S-shaped flow channel combining vertical and horizontal levels, improving the floc deposition effect. Furthermore, one overflow path can be selectively closed for easy cleaning, allowing for uninterrupted wastewater treatment.

Description

Technical Field

[0001] This application relates to the field of metallurgical wastewater overflow treatment technology, specifically to a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater. Background Technology

[0002] Wastewater generated from the hydrometallurgical process of laterite nickel ore needs to be treated before it can be discharged. Even after manganese removal treatment, the wastewater still contains a small amount of flocculants. Current technologies often use thickeners in conjunction with flocculants for treatment. However, thickeners are not very effective at treating wastewater containing fine solid particles with low content, which makes it difficult for the manganese removal wastewater treated by thickeners to meet the standards for discharge into the sea. Summary of the Invention

[0003] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a multi-stage overflow tank for wastewater from laterite nickel ore hydrometallurgical processes, thereby solving the technical problem that thickeners in the prior art have poor sedimentation effects on wastewater with fine and low content of solid particles.

[0004] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0005] This application provides a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater, comprising:

[0006] The inlet pool has two overflow outlet gates; and

[0007] Two overflow pool groups are arranged side by side. Each overflow pool group includes multiple overflow pools arranged longitudinally. The multiple overflow pools in each overflow pool group are connected end to end through overflow outlets. The overflow pool located at the first end along the water flow direction is connected to the overflow outlet gate. Each overflow pool includes two overflow pool bodies arranged transversely and connected at the bottom.

[0008] In some embodiments, the inlet pool includes an inlet pool body and a mixing pool body, the inlet pool body is connected to a wastewater inlet pipe, the bottom of the mixing pool body is connected to the bottom of the inlet pool body, and the two overflow outlet gates are located on adjacent sides of the mixing pool body.

[0009] In some embodiments, the inlet pool further includes an opening and closing mechanism, with two opening and closing mechanisms respectively disposed at the two overflow outlet gates, for controlling the opening or closing of the corresponding overflow outlet gates.

[0010] In some embodiments, the wastewater inlet pipe is suspended above the wastewater level in the inlet tank by a bracket.

[0011] In some embodiments, the water inlet tank further includes a stirring mechanism, the stirring end of which is built into the mixing tank body.

[0012] In some embodiments, the opening and closing mechanism includes a telescopic member and a gate body. The telescopic member is installed on the inlet pool, and the gate body is disposed at the telescopic end of the telescopic member and slidably connected inside the overflow outlet gate, having a position state of closing the overflow outlet gate and a position state of disengaging from the overflow outlet gate.

[0013] In some embodiments, the stirring mechanism includes a stirring and mixing motor and a stirring paddle. The stirring and mixing motor is mounted on the water inlet tank, and the stirring paddle is mounted on the output shaft of the stirring and mixing motor and is built into the mixing tank.

[0014] In some embodiments, each of the overflow pools in any overflow pool group is provided with an external valve on the side opposite to the other overflow pool group, one end of the external valve being connected to the overflow pool and the other end being connected to a drainage trough.

[0015] In some embodiments, one end of the drainage trough is connected to a drainage channel, and the other end is connected to a return pipe.

[0016] In some embodiments, a safety net is provided on the top of the overflow pool.

[0017] Compared with the prior art, the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater provided in this application connects two overflow tank groups through an inlet tank to form two overflow paths. Each overflow path, with overflow outlets connected at the bottom and end, forms an S-shaped flow channel that combines vertical and horizontal levels, which improves the effect of floc deposition. Furthermore, one overflow path can be selectively closed for easy cleaning, and wastewater treatment can be carried out continuously. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater provided in the embodiments of this application;

[0019] Figure 2 This is a three-dimensional schematic diagram of the structure of the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater provided in the embodiments of this application;

[0020] Figure 3 This is a three-dimensional perspective view of the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater provided in the embodiments of this application;

[0021] Figure 4 This is a three-dimensional exploded view of the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater provided in the embodiments of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Inlet pool; 11. Inlet pool body; 12. Mixing pool body; 101. Wastewater inlet pipe; 102. Overflow outlet gate; 2. Overflow pool group; 21. Overflow pool; 211. Overflow pool body; 201. Connecting port; 202. Overflow outlet; 3. Opening and closing mechanism; 31. Telescopic component; 32. Gate body; 4. Stirring mechanism; 41. Stirring and mixing motor; 42. Stirring paddle; 5. External valve; 6. Drainage trough; 7. Drainage channel; 8. Return pipe; 9. Isolation net. Detailed Implementation

[0024] 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.

[0025] To address the technical problem of poor sedimentation effect of thickeners on wastewater with fine and low content of solid particles, this application provides a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater, which can realize an S-shaped flow channel that combines vertical and horizontal layers, so that the direction of water flow changes continuously, and the particulate matter in the wastewater is easily deposited when the water flow changes direction, thereby improving the flocculation and sedimentation effect.

[0026] It should be noted that the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater described in this application is used for, but not limited to, the treatment of laterite nickel ore hydrometallurgical wastewater. For ease of explanation, this application only uses the application of the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater treatment as an example. The principle of applying the multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater to overflow sedimentation in other types of water treatment is essentially the same as the principle of applying it to the treatment of laterite nickel ore hydrometallurgical wastewater, and will not be elaborated here.

[0027] Please see Figure 1-4 , Figure 1This is a schematic diagram of the structure of a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater in one embodiment of this application. The multi-stage overflow tank includes an inlet tank 1 and two overflow tank groups 2. The inlet tank 1 has two overflow outlet gates 102; the two overflow tank groups 2 are arranged side by side, and each overflow tank group 2 includes multiple overflow tanks 21 arranged longitudinally. The multiple overflow tanks 21 of each overflow tank group 2 are connected end to end through overflow outlets 202, and the overflow tank 21 located at the first end along the water flow direction is connected to the overflow outlet gate 102; each overflow tank 21 includes two overflow tank bodies 211 arranged transversely and connected at the bottom. Each overflow pool group 2 forms an overflow path, and the flocculants settle at the bottom of the overflow pool. After a certain period of time, they need to be cleaned. Existing technologies generally rely on manual periodic cleaning. However, if only one path is designed, periodic cleaning requires stopping the overflow process. Therefore, two overflow lines are designed. When one overflow line is working, the other overflow line can be cleaned. The two overflow lines share a water inlet pool, which improves the utilization rate of the water inlet pipe and the flocculant injection pipe. Each overflow pool 21 includes two overflow pool bodies 211 arranged laterally and connected at the bottom. The bottoms of the two overflow pool bodies 211 are connected by a connecting port 201. Overflow ports 202 are provided between the overflow pool bodies 211 in the same column. In conjunction with the connecting ports 201, they form an S-shaped flow channel on the vertical level, that is, the water flows alternately from the top overflow and the bottom in sequence. The overflow ports 202 are arranged sequentially at the head and tail of the multiple overflow pools 21, forming an S-shaped flow channel on the horizontal level. That is, the water flows from the left overflow pool body 211 to the right pool body, and then from the right overflow pool body 211 of the next overflow pool 21 to the left overflow pool body 211, and so on. With the cooperation of the S-shaped flow channels on the two levels, an S-shaped flow channel combining the vertical and horizontal levels is formed to flow through each overflow pool body 211.

[0028] Understandably, the two-tiered S-shaped design allows the direction of water flow to constantly change. Particulate matter in the wastewater easily settles when the flow direction changes; that is, when the fluid direction changes, the particles slow down due to inertia and cannot maintain the same speed as the water flow, thus achieving sedimentation. This embodiment effectively settles fine particulate matter in the manganese-removed liquid from laterite nickel ore, ensuring it meets discharge standards for the sea. It is worth noting that after treatment in the multi-stage overflow tank of this embodiment, the manganese-removed liquid from laterite nickel ore needs to be tested before being discharged into the sea to ensure that elements such as nickel, cobalt, manganese, and magnesium, as well as ammonia nitrogen and COD, do not exceed the standards in the discharged wastewater.

[0029] In one embodiment, please refer to Figure 1The inlet pool 1 includes an inlet pool body 11 and a mixing pool body 12. The inlet pool body 11 is connected to the wastewater inlet pipe 101. The bottom of the mixing pool body 12 is connected to the bottom of the inlet pool body 11. Two overflow outlet gates 102 are located on adjacent sides of the mixing pool body 12. Wastewater is introduced through the inlet pool body 11 and flocculant is added at the same time for mixing. After being stirred and mixed in the mixing pool body 12, the wastewater overflows to two overflow paths for subsequent overflow sedimentation in the overflow pool group.

[0030] For further details, please refer to Figure 1 and Figure 3 The wastewater inlet pipe 101 is suspended above the wastewater surface of the inlet tank 11 by a bracket, so that the wastewater inlet pipe 101, which introduces wastewater from the top, is at a certain height with the wastewater surface accumulated in the tank, which can generate a large impact so that the flocculant and wastewater can be fully mixed, thereby promoting sedimentation in the subsequent overflow tank 21.

[0031] Furthermore, the inlet tank 1 also includes a stirring mechanism 4, the stirring end of which is built into the mixing tank 12 for stirring and mixing the flocculant and wastewater. The flocculant is added to the inlet tank 11 to promote the flocculation and sedimentation of particulate matter. The inlet water impact is used to promote the full mixing of wastewater and flocculant. The stirring mechanism 4 is set in the mixing tank 12 to further mix the wastewater and flocculant to ensure that the particulate matter in the wastewater and the flocculant are in full contact, so as to achieve the purpose of flocculation and sedimentation.

[0032] Specifically, the stirring mechanism 4 includes a stirring and mixing motor 41 and a stirring paddle 42. The stirring and mixing motor 41 is installed on the corresponding mixing tank 12, and the stirring paddle 42 is installed on the output shaft of the stirring and mixing motor 41 and built into the mixing tank 12. The stirring and mixing motor 41 drives the stirring paddle 42 to rotate, thereby mixing the wastewater and flocculant.

[0033] Understandably, the two overflow lines share a single inlet tank 11 and mixing tank 12, which improves the utilization rate of the inlet pipe, flocculant injection pipe, and mixing structure.

[0034] In one embodiment, please refer to Figure 3 and Figure 4 In order to control the opening and closing of the two overflow paths, the inlet pool 1 also includes an opening and closing mechanism 3. The two opening and closing mechanisms 3 are respectively installed at the two overflow outlet gates 102, and are used to control the opening or closing of the corresponding overflow outlet gates 102.

[0035] Specifically, the opening and closing mechanism 3 includes a telescopic member 31 and a gate body 32. The telescopic member 31 is installed on the mixing tank body 12, and the gate body 32 is located at the telescopic end of the telescopic member 31 and is slidably connected inside the overflow outlet gate 102. It has a position state where the overflow outlet gate 102 is closed, and a position state where it is disengaged from the overflow outlet gate 102. By telescopically extending and retracting the telescopic member 31, the gate body 32 is controlled to rise and disengage from the overflow outlet gate 102, and the gate body 32 is controlled to descend and close the overflow outlet gate 102. That is, the gate rises to open the overflow and lowers to close the overflow.

[0036] Understandably, the telescopic component 31 can be a hydraulic cylinder telescopic rod to perform telescopic movements, thereby controlling the raising and lowering of the gate body 32.

[0037] In one embodiment, please refer to Figure 1 To facilitate cleaning, each overflow pool 21 of any overflow pool group 2 is provided with an external valve 5 on the side away from the other overflow pool group 2. One end of the external valve 5 is connected to the overflow pool 21 and the other end is connected to a drainage trough 6, so that the wastewater in the overflow pool 21 can be released, collected and diverted during cleaning.

[0038] For further details, please refer to Figure 1 In order to guide the wastewater according to the discharge, one end of the drainage tank 6 is connected to the drainage channel 7 and the other end is connected to the return pipe 8. The discharged clean water that has settled can be discharged into the drainage channel 7. The wastewater with flocculated sediment particles at the bottom of the overflow tank 21 and the wastewater used to clean the sediment particles at the bottom can be discharged into the return pipe 8. Subsequently, it can be pumped back to other processes, such as countercurrent washing, waste residue treatment, etc.

[0039] Furthermore, to facilitate workers' movement and maintenance above the overflow pool 21, an isolation net 9 is provided on the top of the overflow pool 21 and the inlet pool 1.

[0040] To better understand this application, the following is combined with... Figures 1 to 4The technical solution of this application is described in detail as follows: Wastewater and flocculant are initially mixed in the inlet tank 11 by impact injection through the wastewater inlet pipe 101, and then flow into the mixing tank 12 from the bottom connection. Under the stirring of the stirring mechanism 4, they are further mixed. The mixing tank 12 has two overflow outlet gates 102. Correspondingly, both overflow outlet gates 102 are open, corresponding to two overflow routes. In each of the two overflow routes, there are four sets of overflow pools 21. In the overflow pools 21, with the cooperation of the bottom connection port 201 and the overflow port 202, an S-shaped flow channel combining vertical and horizontal layers is formed for overflow and floc deposition, and finally discharged. When it is necessary to clean the overflow pools 21, one overflow route is closed by the opening and closing mechanism 3, and the external valve 5 on the side of the overflow pool 21 on that overflow route is opened, and the wastewater is discharged to the corresponding pipe through the drainage trough 6.

[0041] 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 multi-stage overflow tank for hydrometallurgical effluents of lateritic nickel ores, characterized in that, include: The inlet pool has two overflow outlet gates; and Two overflow pool groups are arranged side by side. Each overflow pool group includes multiple overflow pools arranged longitudinally. The multiple overflow pools in each overflow pool group are connected end to end through overflow outlets. The overflow pool located at the first end along the water flow direction is connected to the overflow outlet gate. Each overflow pool includes two overflow pool bodies arranged transversely and connected at the bottom.

2. The laterite nickel ore hydrometallurgy wastewater multistage overflow pond according to claim 1, characterized in that, The inlet pool includes an inlet pool body and a mixing pool body. The inlet pool body is connected to a wastewater inlet pipe. The bottom of the mixing pool body is connected to the bottom of the inlet pool body. The two overflow outlet gates are located on adjacent sides of the mixing pool body.

3. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 2, characterized in that, The water inlet pool also includes an opening and closing mechanism. The two opening and closing mechanisms are respectively installed at the two overflow outlet gates and are used to control the opening or closing of the corresponding overflow outlet gates.

4. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 3, characterized in that, The wastewater inlet pipe is suspended above the wastewater level in the inlet tank via a bracket.

5. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 4, characterized in that, The water inlet tank also includes a stirring mechanism, the stirring end of which is built into the mixing tank.

6. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 5, characterized in that, The opening and closing mechanism includes a telescopic component and a gate body. The telescopic component is installed on the inlet pool, and the gate body is located at the telescopic end of the telescopic component and is slidably connected inside the overflow outlet gate. It has a position state where the overflow outlet gate is closed and a position state where it is disengaged from the overflow outlet gate.

7. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 6, characterized in that, The stirring mechanism includes a stirring motor and a stirring paddle. The stirring motor is installed on the water inlet tank, and the stirring paddle is installed on the output shaft of the stirring motor and built into the mixing tank.

8. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 7, characterized in that, Each overflow pool in any overflow pool group is provided with an external valve on the side facing away from the other overflow pool group. One end of the external valve is connected to the overflow pool, and the other end is connected to a drainage trough.

9. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 8, characterized in that, One end of the drainage trough is connected to a drainage channel, and the other end is connected to a return pipe.

10. The multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater according to claim 9, characterized in that, An isolation net is installed on the top of the overflow pool.

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