Multistage neutralization device for laterite-nickel ore and circulating leaching neutralization system

Abstract

The invention discloses a multi-stage neutralization device for laterite-nickel mining and a circulating leaching neutralization system.The multi-stage neutralization device for laterite-nickel mining comprises a plurality of neutralization tanks, a plurality of first stirring devices, an ore pulp pipeline, a limestone slurry pipeline and an automatic regulation and control device, and the multiple neutralization tanks are arranged at intervals in the first direction; the plurality of neutralizing tanks are provided with a first side and a second side which are oppositely arranged along a second direction, and the ore pulp pipeline is arranged on the first side and can be sequentially connected in series with any part or all of the plurality of neutralizing tanks; the limestone slurry pipeline is arranged on the second side, the limestone slurry pipeline is respectively connected with the plurality of neutralizing tanks, and the automatic regulation and control device can regulate and control the adding flow of the limestone slurry in the neutralizing tanks according to the liquid levels in the neutralizing tanks. And the addition amount of the limestone slurry is controlled by matching with the automatic regulation and control device, so that the optimal reaction rate in the neutralizing tank is ensured while severe reaction is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of laterite nickel ore hydrometallurgy, and in particular to a multi-stage neutralization device and a circulating leaching neutralization system for laterite nickel ore. Background Art

[0002] At present, in the hydrometallurgical process of laterite nickel ore, generally after high pressure leaching or oxygen pressure leaching, cyclic leaching and multi-stage neutralization reaction are required to meet the requirements of the next process. In the prior art, multi-stage neutralization generally uses alkali solution or limestone slurry. The former is easy to control the reaction but expensive, while the latter is cheap but has a more violent reaction. Therefore, the addition of limestone slurry requires flow control, which leads to low neutralization efficiency. Summary of the invention

[0003] The purpose of this application is to overcome the above technical deficiencies, propose a multi-stage neutralization device for laterite nickel ore, and solve the technical problem of low multi-stage neutralization efficiency in the hydrometallurgical process of laterite nickel ore in the prior art.

[0004] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0005] The present application provides a multi-stage neutralization device for laterite nickel ore, comprising:

[0006] A plurality of neutralization grooves, wherein the plurality of neutralization grooves are arranged at intervals along a first direction, and the plurality of neutralization grooves have a first side and a second side arranged opposite to each other along a second direction, and the first direction and the second direction are perpendicular to each other;

[0007] A plurality of first stirring devices, each of the plurality of first stirring devices corresponds to the plurality of neutralization tanks, and the first stirring devices are arranged in the corresponding neutralization tanks;

[0008] A slurry pipeline, which is arranged on the first side and can sequentially connect any part or all of the plurality of neutralization tanks in series;

[0009] a limestone slurry pipeline, the limestone slurry pipeline being arranged on the second side, the limestone slurry pipeline being respectively connected to the plurality of neutralization tanks; and

[0010] The automatic control device controls the addition flow of the limestone slurry according to the liquid level in the neutralization tank.

[0011] In some embodiments, the slurry pipeline includes a first main pipeline and a plurality of connecting pipelines corresponding one by one to the plurality of neutralization tanks, each of the connecting pipelines includes a feed pipe and a discharge pipe, the feed pipe and the discharge pipe are spaced apart along a first direction, one end of the feed pipe and the discharge pipe are connected to the neutralization tank, and the other end of the feed pipe and the discharge pipe are connected to the first main pipeline, and the distance between the feed pipe and the discharge pipe in the same connecting pipeline gradually increases in the direction away from the neutralization tank.

[0012] In some embodiments, the angle between the feed pipe and the discharge pipe in the same connecting pipeline is not less than 120°.

[0013] In some embodiments, the feed pipe is provided with a first valve, the discharge pipe is provided with a second valve, the first main pipeline is provided with a plurality of third valves, the plurality of third valves correspond one-to-one to the plurality of neutralization tanks, and the third valves are located between the feed pipe and the discharge pipe in the same connecting pipeline.

[0014] In some embodiments, the first main pipeline is further provided with a plurality of observation ports extending upward, and each of the observation ports is located between the discharge pipe and the feed pipe of two adjacent neutralization tanks, and the discharge pipe and the feed pipe of the two adjacent neutralization tanks are the discharge pipe of the upper-level neutralization tank and the feed pipe of the lower-level neutralization tank along the direction of slurry flow.

[0015] In some embodiments, the automatic control device includes a control device, multiple detection devices and multiple flow valves. The multiple detection devices and the multiple flow valves are arranged one-to-one corresponding to the neutralization tank. The detection device is used to detect the liquid level or pH value of the material in the neutralization tank. Each flow valve is installed at the connection between the neutralization tank and the limestone slurry pipeline. The control device is electrically connected to the multiple flow valves and the multiple detection devices. The control device is used to control the opening degree of the corresponding flow valve according to the liquid level value or pH value of the material in each neutralization tank.

[0016] In some embodiments, the detection device includes a pH detector and a liquid level meter. The pH detector is located in the neutralization tank at the end along the slurry flow direction, and the liquid level meter is located in the remaining neutralization tanks.

[0017] In some embodiments, the limestone slurry pipeline is connected to the bottom or top of the neutralization tank.

[0018] In addition, the present invention also provides a circulating leaching neutralization system, comprising a mixing tank, a leaching tank and the multi-stage neutralization device for laterite nickel ore, wherein the discharge end of the mixing tank is communicated with the feed end of the leaching tank, and the discharge end of the leaching tank is connected to the feed end of the slurry pipeline, wherein the mixing tank is located above the leaching tank, and the diameter of the mixing tank is smaller than the diameter of the leaching tank.

[0019] In some embodiments, the mixing tank is further connected to the feed end of the slurry pipeline via a connecting pipe.

[0020] Compared with the prior art, the multi-stage neutralization device for laterite nickel ore provided in the present application comprises a plurality of neutralization tanks arranged at intervals along a first direction, a plurality of neutralization tanks having a first side and a second side arranged opposite to each other along a second direction, a first stirring device being arranged in each neutralization tank, the ore slurry pipeline and the limestone slurry pipeline being arranged on the first side and the second side respectively, the ore slurry pipeline being used to transport ore slurry into the neutralization tank, the limestone slurry pipeline being used to transport limestone slurry into the neutralization tank, the ore slurry pipeline and the limestone slurry pipeline being located on opposite sides of the neutralization tank, so that The ore pulp and limestone slurry are first contacted with the material after the neutralization reaction in the neutralization tank, and the ore pulp and limestone slurry are dispersed into the reacted material, and the material after the neutralization reaction in the neutralization tank is used for buffering to avoid direct contact between the ore pulp and the limestone slurry transported to the neutralization tank, and then the automatic control device is used to control the amount of limestone slurry added to avoid violent reaction while ensuring the neutralization tank is at an optimal reaction rate, and each of the neutralization tanks is also provided with the first stirring device, and the first stirring device can promote the full neutralization reaction of the limestone slurry and the ore pulp.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the preferred embodiments of the present application are described in detail as follows in conjunction with the accompanying drawings. The specific implementation methods of the present application are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a multi-stage neutralization device for laterite nickel ore provided by the present application;

[0023] Figure 2 yes Figure 1 Top view of a multi-stage neutralization unit for medium laterite nickel ore.

[0024] Description of reference numerals:

[0025] 100-multi-stage neutralization device for laterite nickel ore, 1-neutralization tank, 2-first stirring device, 3-slurry pipeline, 31-feed pipe, 32-discharge pipe, 33-first main pipeline, 34-first valve, 35-second valve, 36-third valve, 4-limestone slurry pipeline, 41-second main pipeline, 42-branch pipeline, 43-fourth valve, 44-flow valve, 200-circulating leaching neutralization system, 210-mixing tank, 220-leaching tank, 230-second stirring device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] In order to solve the technical problem of low multi-stage neutralization efficiency in the hydrometallurgical process of laterite nickel ore in the prior art, the present application provides a multi-stage neutralization device for laterite nickel ore, wherein the slurry pipeline and the limestone slurry pipeline are located on opposite sides of the neutralization tank, so that the slurry and the limestone slurry first contact with the material after the neutralization reaction in the neutralization tank, and the slurry and the limestone slurry are dispersed into the reacted material, and the material after the neutralization reaction in the neutralization tank is used for buffering to avoid direct contact between the slurry transported to the neutralization tank and the limestone slurry to cause a violent reaction, and each of the neutralization tanks is also provided with the first stirring device, and the first stirring device can promote the limestone slurry and the slurry to fully neutralize and ensure the neutralization efficiency.

[0028] See also Figure 1 , Figure 1 It is a schematic diagram of the structure of a multi-stage neutralization device for laterite nickel ore in one embodiment of the present application.

[0029] The present application provides a multi-stage neutralization device 100 for laterite nickel ore, comprising a plurality of neutralization tanks 1, a plurality of first stirring devices 2, a slurry pipeline 3, a limestone slurry pipeline 4 and an automatic control device, wherein the plurality of neutralization tanks 1 are arranged at intervals along a first direction, and the plurality of neutralization tanks 1 have a first side and a second side arranged relatively along a second direction, and the first direction and the second direction are perpendicular to each other; the plurality of first stirring devices 2 correspond to the plurality of neutralization tanks 1 one by one, and the first stirring devices 2 are arranged in the corresponding neutralization tanks 1; the slurry pipeline 3 is arranged on the first side, and can be connected in series in sequence to any part or all of the plurality of neutralization tanks 1; the limestone slurry pipeline 4 is arranged on the second side, and the limestone slurry pipeline 4 is connected to the plurality of neutralization tanks 1 respectively; the automatic control device controls the addition flow of the limestone slurry in the neutralization tank 1 according to the liquid level in the neutralization tank 1.

[0030] In this example, see Figure 1 to Figure 2 , the plurality of neutralization tanks 1 are arranged at intervals along the first direction, the plurality of neutralization tanks 1 have a first side and a second side arranged opposite to each other along the second direction, each of the neutralization tanks 1 is provided with a first stirring device 2, the ore slurry pipeline 3 and the limestone slurry pipeline 4 are arranged on the first side and the second side respectively, the ore slurry pipeline 3 is used to transport ore slurry into the neutralization tank 1, the limestone slurry pipeline 4 is used to transport limestone slurry into the neutralization tank 1, the ore slurry pipeline 3 and the limestone slurry pipeline 4 are located on opposite sides of the neutralization tank 1, so that The ore pulp and limestone slurry are first contacted with the material after the neutralization reaction in the neutralization tank 1, and the ore pulp and limestone slurry are dispersed into the reacted material, and the material after the neutralization reaction in the neutralization tank 1 is used for buffering, and then the amount of limestone slurry added is controlled in conjunction with the automatic control device to ensure that the neutralization tank 1 is at an optimal reaction rate while avoiding violent reactions. In addition, each of the neutralization tanks 1 is also provided with the first stirring device 2, and the first stirring device 2 can promote the full neutralization reaction of the limestone slurry and the ore pulp to ensure the neutralization efficiency.

[0031] In this embodiment, a slurry inlet and a slurry outlet are provided at the side wall of the first side of the neutralization tank 1, and the slurry pipeline 3 connects the slurry inlet and the slurry outlet of the adjacent neutralization tanks 1, so that the multiple neutralization tanks 1 are arranged in series in sequence, that is, the slurry flows into the multiple neutralization tanks 1 in sequence, and will undergo a neutralization reaction with the limestone slurry in each of the neutralization tanks 1 to complete a multi-stage neutralization reaction; a limestone slurry inlet is provided at the side wall of the second side of the neutralization tank 1, and the limestone slurry pipeline 4 is connected to the multiple limestone slurry inlets, so as to simultaneously transport the limestone slurry to the multiple neutralization tanks 1.

[0032] In some embodiments, the slurry pipeline 3 includes a first main pipeline 33 and a plurality of connecting pipelines corresponding one by one to the plurality of neutralization tanks 1, each of the connecting pipelines includes a feed pipe 31 and a discharge pipe 32, the feed pipe 31 and the discharge pipe 32 are spaced apart along a first direction, one end of the feed pipe 31 and the discharge pipe 32 are both connected to the neutralization tank 1, and the other end of the feed pipe 31 and the discharge pipe 32 are both connected to the first main pipeline 33, and the distance between the feed pipe 31 and the discharge pipe 32 in the same connecting pipeline gradually increases in the direction away from the neutralization tank 1.

[0033] In this embodiment, since the slurry pipeline 3 needs to connect multiple neutralization tanks 1 in series, the first main pipeline 33 is extended along the first direction, the first main pipeline 33 is located on the first side, and the feed end of the first main pipeline 33 is connected to the leaching tank, and the two ends of each of the feed pipes 31 are respectively connected to the slurry inlet of the corresponding neutralization tank 1 and the first main pipeline 33, and the two ends of each of the discharge pipes 32 are respectively connected to the slurry outlet of the corresponding neutralization tank 1 and the first main pipeline 33, so that the purpose of connecting multiple neutralization tanks 1 in series can be achieved, and the distance between the feed pipe 31 and the discharge pipe 32 gradually increases in the direction away from the neutralization tank 1, that is, the feed pipe 31 and the discharge pipe 32 connected to the same neutralization tank 1 are arranged in an eight-shaped shape, so that it is convenient for the slurry to enter and exit the neutralization tank 1.

[0034] In some embodiments, the angle between the feed pipe 31 and the discharge pipe 32 in the same connecting pipeline is not less than 120°. The larger the angle between the feed pipe 31 and the discharge pipe 32, the more conducive it is for the slurry to enter and exit the neutralization tank 1.

[0035] In some embodiments, the feed pipe 31 is provided with a first valve 34, the discharge pipe 32 is provided with a second valve 35, the first main pipeline 33 is provided with a plurality of third valves 36, the plurality of third valves 36 correspond one-to-one to the plurality of neutralization tanks 1, and the third valve 36 is located between the feed pipe 31 and the discharge pipe 32 in the same connecting pipeline.

[0036] In this embodiment, generally, one of the multiple neutralization tanks 1 is selected as a spare, that is, during normal use, the spare neutralization tank 1 is idle. In order to achieve the above purpose, a first valve 34 is provided on the feed pipe 31, a second valve 35 is provided on the discharge pipe 32, and a third valve 36 is provided on the first main pipeline 33. Accordingly, a fourth valve 43 is provided at the connection between the limestone slurry pipeline 4 and each of the neutralization tanks 1. When in use, the first valve 34 and the second valve 43 of the spare neutralization tank 1 are closed. 35 and the fourth valve 43, and open the third valve 36. At this time, the slurry directly enters the next neutralization tank 1 through the first main pipeline 33, and the limestone slurry also does not enter the neutralization tank 1. By setting a spare neutralization tank 1, on the one hand, when other neutralization tanks 1 are under maintenance or damaged, the slurry can be controlled by valves to prevent the slurry from passing through the neutralization tank 1 but entering the spare neutralization tank 1 for reaction, thereby ensuring the smooth progress of the multi-stage neutralization reaction. On the other hand, when the next process needs to reduce the flow rate, part of the slurry can be diverted to the spare neutralization tank 1 as a temporary storage container.

[0037] It should be noted that the above-mentioned valve can be a manual valve or an electric valve, which is not limited here.

[0038] In some embodiments, the first main pipeline 33 is also provided with a plurality of observation ports extending upward, and each of the observation ports is located between the discharge pipe 32 and the feed pipe 31 of two adjacent neutralization tanks 1, and the discharge pipe 32 and the feed pipe 31 of two adjacent neutralization tanks 1 are the discharge pipe 32 of the upper-level neutralization tank 1 and the feed pipe 31 of the lower-level neutralization tank 1 along the slurry flow direction.

[0039] In this embodiment, the slurry pipeline 3 also includes an observation tube, which is extended in the vertical direction. The lower end of the observation tube is connected to the first main pipeline 33 to form the observation port. The height of the observation tube is less than the height of the neutralization tank 1. By setting the observation port, the slurry level can be observed in real time. If the slurry overflows from the observation port, it means that the neutralization reaction in the neutralization tank 1 is too intense. At this time, the amount of limestone slurry input into the neutralization tank 1 needs to be reduced.

[0040] In this embodiment, the limestone slurry pipeline 4 includes a second main pipeline 41 and multiple branch pipelines 42. The second main pipeline 41 is extended along the first direction. The second main pipeline 41 is located on the second side. The multiple branch pipelines 42 correspond one by one to the multiple neutralization tanks 1. Each branch pipeline 42 is respectively connected to the neutralization tank 1 and the second main pipeline 41.

[0041] Specifically, the branch pipe 42 is communicated with the limestone slurry inlet, and the fourth valve 43 is disposed on the branch pipe 42 .

[0042] In some embodiments, the automatic control device includes a control device, multiple detection devices and multiple flow valves 44. The multiple detection devices and the multiple flow valves are arranged one by one corresponding to the neutralization tank 1. The detection device is used to detect the liquid level or pH value of the material in the neutralization tank 1. Each of the flow valves 44 is installed at the connection between the neutralization tank 1 and the limestone slurry pipeline 4. The control device is electrically connected to the multiple flow valves 44 and the multiple detection devices. The control device is used to control the opening degree of the corresponding flow valve 44 according to the liquid level value or pH value of the material in each neutralization tank 1.

[0043] In this embodiment, in order to ensure the optimal reaction rate in the neutralization tank 1, each neutralization tank 1 is also provided with a detection device, and the detection device can detect the liquid level or pH value of the corresponding material in the neutralization tank 1. The flow valve 44 is arranged on the branch pipe 42, and the flow valve 44 can control the flow of limestone slurry entering the neutralization tank 1. The control device is electrically connected to multiple flow valves 44 and multiple detection devices. The control device can control the input amount of limestone slurry according to the liquid level or pH value in each neutralization tank 1, so as to ensure the neutralization efficiency as much as possible while avoiding violent neutralization reaction.

[0044] In some embodiments, the detection device includes a pH detector and a liquid level meter. The pH detector is located in the neutralization tank 1 at the end along the slurry flow direction, and the liquid level meter is located in the remaining neutralization tanks 1.

[0045] In this embodiment, the pH of the last neutralization tank 1 is generally close to or meets 2.2-2.5. Therefore, there is no possibility of adding excessive limestone slurry to the last neutralization tank 1, that is, the last neutralization tank 1 will not undergo an overly violent neutralization reaction. Therefore, the neutralization tank 1 at the end only needs to detect the pH value of the material therein, while the remaining neutralization tanks 1 may undergo a violent neutralization reaction. Therefore, the liquid level gauge is required to be set in the remaining neutralization tanks 1 to detect the liquid level of the material therein. During specific use, when the liquid level in a certain neutralization tank 1 is lower than the set value, the flow valve 44 can be controlled to increase the input amount of limestone slurry to ensure the reaction efficiency. When the liquid level in a certain neutralization tank 1 is higher than the set value, the flow valve 44 can be controlled to reduce the input amount of limestone slurry to avoid a violent reaction. Such a setting can control the opening size of the flow valve 44 according to the liquid level of the liquid level gauge, thereby ensuring that the neutralization tank 1 is at the optimal reaction rate.

[0046] In some embodiments, the limestone slurry pipeline 4 is connected to the bottom or top of the neutralization tank 1 .

[0047] There is no limitation on the connection position between the branch pipe 42 and the neutralization tank 1. The branch pipe 42 may be connected to the top of the neutralization tank 1 or to the middle and lower part of the neutralization tank 1. In the present embodiment, the branch pipe 42 is connected to the bottom of the neutralization tank 1. In this arrangement, the carbon dioxide generated during the neutralization reaction can disturb the material when it rises, which helps to reduce the liquid level after the reaction and improve the uniformity and sufficiency of the reaction.

[0048] In this embodiment, the first stirring device 2 includes a stirring shaft, two stirring paddles and a stirring motor. The stirring shaft is rotatably installed in the neutralization tank 1 along the axis in the vertical direction. The two stirring paddles are installed on the stirring shaft at intervals in the vertical direction. The stirring motor is connected to the upper end of the stirring shaft. By providing the two stirring paddles, the material in the neutralization tank 1 can be fully stirred, which helps to fully contact the limestone slurry with the ore slurry and promote the uniformity and efficiency of the neutralization reaction.

[0049] In this embodiment, an exhaust pipe is further provided on the top of the neutralization tank 1, and the exhaust pipe is used to discharge the carbon dioxide generated by the neutralization reaction.

[0050] In addition, the present invention also provides a circulating leaching neutralization system 200, comprising a mixing tank 210, a leaching tank 220 and the multi-stage neutralization device 100 for laterite nickel ore, the discharge end of the mixing tank 210 is connected to the feed end of the leaching tank 220, and the discharge end of the leaching tank 220 is connected to the feed end of the slurry pipeline 3, wherein the mixing tank 210 is located above the leaching tank 220, and the diameter of the mixing tank 210 is smaller than the diameter of the leaching tank 220.

[0051] In this embodiment, the leaching tank 220 and the multiple neutralization tanks 1 are arranged at intervals along the first direction, and the mixing tank 210 is located on the top of the leaching tank 220. The slurry flows from the mixing tank 210 through the leaching tank 220 and the multiple neutralization tanks 1 in sequence. The mixing tank 210 can be used as a reaction tank, and the leaching tank 220 is used for redundant transition to facilitate the transportation of the slurry into the neutralization tank 1.

[0052] In this embodiment, a second stirring device 230 is provided in both the mixing tank 210 and the leaching tank 220. The second stirring device 230 located in the mixing tank 210 is used for fully mixing and promoting the mixing reaction. The second stirring device 230 located in the leaching tank 220 is used to ensure continuous reaction and promote continuous leaching of nickel, cobalt and manganese, and has a certain buffering effect to avoid excessive impact of the feed on the neutralization tank 1.

[0053] In some embodiments, the mixing tank 210 is also connected to the feed end of the slurry pipeline 3 through a connecting pipe.

[0054] In this embodiment, in order to avoid the production line being shut down when the leaching tank 220 is under maintenance, the mixing tank 210 is also connected to the feed end of the slurry pipeline 3 through a connecting pipe. With this arrangement, when the leaching tank 220 is under maintenance, the mixing tank 210 can directly transport the slurry to the neutralization tank 1, thereby avoiding production line shutdown.

[0055] It is understandable that valves are provided on the connecting pipe and the pipe connecting the mixing tank 210 and the leaching tank 220. In normal use, the valve on the connecting pipe is closed so that the slurry is transported to the leaching tank 220. When the leaching tank 220 is under maintenance, the valve on the pipe between the mixing tank 210 and the leaching tank 220 can be closed, and the valve on the connecting pipe is opened so that the slurry is transported from the mixing tank 210 to the neutralization tank 1.

[0056] In order to better understand this application, the following Figure 1 to Figure 2 The technical solution of this application is described in detail:

[0057] The slurry continuously reacts in the mixing tank 210 and the leaching tank 220 to leach nickel, cobalt and manganese, and is then transported to the neutralization tank 1 through the first main pipeline 33 and the feed pipe 31. At the same time, limestone slurry is transported to the neutralization tank 1 through the second main pipeline 41 and the branch pipeline 42. The slurry and the limestone slurry undergo a neutralization reaction, and the generated carbon dioxide is discharged from the neutralization tank 1 from the exhaust pipe. The slurry enters the multiple neutralization tanks in sequence through the feed pipe 31 and the discharge pipe 32, and the multiple neutralization tanks 1 undergo a neutralization reaction at the same time. When the liquid level in a certain neutralization tank 1 is lower than the set value, the control device controls the flow valve 44 to increase the input amount of the limestone slurry to ensure the reaction efficiency. When the liquid level in a certain neutralization tank 1 is higher than the set value, the control device controls the flow valve 44 to reduce the input amount of the limestone slurry to avoid a violent reaction, thereby ensuring that the neutralization tank 1 is at an optimal reaction rate.

[0058] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A multi-stage neutralization device for laterite nickel ore, characterized in that: include: A plurality of neutralization grooves, wherein the plurality of neutralization grooves are arranged at intervals along a first direction, and the plurality of neutralization grooves have a first side and a second side arranged opposite to each other along a second direction, and the first direction and the second direction are perpendicular to each other; A plurality of first stirring devices, each of the plurality of first stirring devices corresponds to the plurality of neutralization tanks, and the first stirring devices are arranged in the corresponding neutralization tanks; A slurry pipeline, which is arranged on the first side and can sequentially connect any part or all of the plurality of neutralization tanks in series; A limestone slurry pipeline, the limestone slurry pipeline is arranged on the second side, and the limestone slurry pipeline is respectively connected to the plurality of neutralization tanks; and The automatic control device controls the addition flow of the limestone slurry according to the liquid level in the neutralization tank.

2. The multi-stage neutralization device for laterite nickel ore according to claim 1, characterized in that: The slurry pipeline includes a first main pipeline and a plurality of connecting pipelines corresponding to the plurality of neutralization tanks one by one, each of the connecting pipelines includes a feed pipe and a discharge pipe, the feed pipe and the discharge pipe are arranged at intervals along a first direction, one end of the feed pipe and the discharge pipe are connected to the neutralization tank, and the other end of the feed pipe and the discharge pipe are connected to the first main pipeline, and the distance between the feed pipe and the discharge pipe in the same connecting pipeline gradually increases in a direction away from the neutralization tank.

3. The multi-stage neutralization device for laterite nickel ore according to claim 2, characterized in that: The angle between the feed pipe and the discharge pipe in the same connecting pipeline is not less than 120°.

4. The multi-stage neutralization device for laterite nickel ore according to claim 2, characterized in that: The feed pipe is provided with a first valve, the discharge pipe is provided with a second valve, the first main pipeline is provided with a plurality of third valves, the plurality of third valves correspond one-to-one to the plurality of neutralization tanks, and the third valves are located between the feed pipe and the discharge pipe in the same connecting pipeline.

5. The multi-stage neutralization device for laterite nickel ore according to claim 2, characterized in that: The first main pipeline is also provided with a plurality of observation ports extending upward, and each of the observation ports is located between the discharge pipe and the feed pipe of two adjacent neutralization tanks, and the discharge pipe and the feed pipe of the two adjacent neutralization tanks are the discharge pipe of the upper-level neutralization tank and the feed pipe of the lower-level neutralization tank along the slurry flow direction.

6. The multi-stage neutralization device for laterite nickel ore according to claim 1, characterized in that: The automatic control device includes a control device, multiple detection devices and multiple flow valves. The multiple detection devices and the multiple flow valves are arranged one-to-one corresponding to the neutralization tank. The detection device is used to detect the liquid level or pH value of the material in the neutralization tank. Each flow valve is installed at the connection between the neutralization tank and the limestone slurry pipeline. The control device is electrically connected to the multiple flow valves and the multiple detection devices. The control device is used to control the opening degree of the corresponding flow valve according to the liquid level value or pH value of the material in each neutralization tank.

7. The multi-stage neutralization device for laterite nickel ore according to claim 6, characterized in that: The detection device comprises a pH detector and a liquid level meter. The pH detector is located in the neutralization tank at the end along the slurry flow direction, and the liquid level meter is located in the remaining neutralization tanks.

8. The multi-stage neutralization device for laterite nickel ore according to claim 1, characterized in that: The limestone slurry pipeline is connected to the bottom or top of the neutralization tank.

9. A circulating leaching and neutralization system, characterized in that: It comprises a mixing tank, a leaching tank and a multi-stage neutralization device for laterite nickel ore according to any one of claims 1 to 8, wherein the discharge end of the mixing tank is communicated with the feed end of the leaching tank, and the discharge end of the leaching tank is connected to the feed end of the slurry pipeline, wherein the mixing tank is located above the leaching tank, and the diameter of the mixing tank is smaller than the diameter of the leaching tank.

10. The circulating leaching and neutralization system according to claim 9, characterized in that: The mixing tank is also connected to the feed end of the slurry pipeline through a connecting pipe.

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