Reaction kettle for neutralizing and removing impurities in laterite nickel ore

Abstract

The application discloses a kind of red soil nickel ore neutralization and impurity removal reaction kettle, belong to metallurgical technology field, comprising: kettle body, feeding device, detection device and stirring device, the inside of kettle body is formed with several reaction layers along its height direction;Feeding device includes several output parts, the outlet of several output parts is respectively communicated with several reaction layers, the inlet of each output part is respectively communicated with the slurry conveying unit for conveying slurry and the neutralizing agent conveying unit for conveying neutralizing agent, and first valve and second valve are respectively arranged between the pipeline communicated with slurry conveying unit and neutralizing agent conveying unit;Detection device has several detection pieces, each reaction layer has at least one detection piece;The application realizes the layered control and adjustment to the pH value of slurry in kettle body, so that the pH value of slurry in each part of kettle body is kept in suitable range, avoid the difference of pH value is larger and local over-alkali phenomenon.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a reaction vessel for neutralizing and removing impurities from laterite nickel ore. Background Technology

[0002] Lateritic nickel ore contains 65%–70% of the land-based nickel reserves and is an important mineral for smelting nickel and nickel-based compounds. Lateritic nickel ore can be broadly classified into three types: limonite type, transitional type, and sapropelic type. Generally, sapropelic type ore with a nickel content of 1.8% or higher is suitable for the RKEF pyrometallurgical process, while limonite and transitional type ore with a nickel content of 1.8% or lower are suitable for hydrometallurgical processes such as high-pressure acid leaching and atmospheric-pressure acid leaching.

[0003] CN116411179A discloses a wet processing technology for laterite nickel ore, including step S1, high-pressure acid leaching of laterite nickel ore, followed by solid-liquid separation and washing to obtain filtrate and filtrate residue; step S2, alkaline washing of the filtrate residue with alkaline solution to obtain hematite; step S3, pressurized iron removal treatment of the filtrate to obtain hematite product and iron-removed liquid; step S4, neutralization and iron removal treatment of the iron-removed liquid with a first neutralizing agent to obtain neutralization residue and neutralized iron-removed liquid; step S5, aluminum-chromium precipitation treatment of the neutralized iron-removed liquid with a second neutralizing agent to obtain aluminum-chromium slag and iron-aluminum removal liquid; step S6, nickel-cobalt-manganese precipitation treatment of the iron-aluminum removal liquid with a third neutralizing agent and an oxidizing agent to obtain crude nickel-cobalt-manganese hydroxide precipitate and precipitation liquid; and step S7. Magnesium recovery treatment is performed on the precipitated liquid to obtain basic magnesium carbonate product and tailings. In the above-mentioned prior art, steps S4, S5 and S6 all utilize neutralizing agents to perform neutralization and iron removal treatment, aluminum and chromium precipitation treatment and nickel, cobalt and manganese precipitation treatment, respectively. Among them, the iron and aluminum and chromium removal unit mainly removes impurities from the liquid phase of the leachate. During the treatment, the leachate is transported to the reactor and a neutralizing agent is added to it. The treatment is carried out in the reactor. The impurity removal method is to gradually increase the pH value by adding neutralizing agent. However, during the treatment process, due to the large capacity of the reactor, it is difficult to uniformly mix the neutralizing agent and slurry when the neutralizing agent and slurry are directly transported into it. In addition, there will be local over-alkali phenomenon at the location where the neutralizing agent is added, which can easily lead to a large difference in the pH value of the slurry in different parts of the reactor, thereby affecting the treatment efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a reaction vessel for neutralizing and removing impurities from laterite nickel ore, thereby solving the technical problem that the pH difference of the slurry in different parts of the reaction vessel is large in the prior art, which affects the processing efficiency.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a reaction vessel for neutralizing and removing impurities from laterite nickel ore, comprising: a vessel body, a feeding device, a detection device, and a stirring device. The vessel body has several reaction layers formed along its height. The feeding device includes several output sections, each with its outlet connected to one of the reaction layers. Each output section's inlet is connected to a slurry conveying unit for conveying slurry and a neutralizing agent conveying unit for conveying neutralizing agent. A first valve and a second valve are respectively provided between the pipes connected to the slurry conveying unit and the neutralizing agent conveying unit. The detection device has several detection elements, with at least one detection element in each reaction layer to detect the pH value of the slurry inside the reaction layer. Each detection element is electrically connected to the first valve and the second valve of the corresponding conveying section in the reaction layer via a controller, controlling the opening and closing of the first valve and the second valve based on the detected pH value, thereby controlling the slurry or neutralizing agent to be discharged to the corresponding reaction layer via the output section. The stirring end of the stirring device is rotatably disposed inside the vessel body for stirring the slurry.

[0006] In some embodiments, when the pH value detected by the detector is below a set value, the first valve is controlled to close and the second valve is controlled to open, so that the neutralizing agent can enter the output section and be added to the reaction layer through the output section to increase the pH value; when the pH value detected by the detector reaches the set value, the first valve is controlled to open and the second valve is controlled to close, so that the slurry can enter the output section and be delivered to the reaction layer through the output section.

[0007] In some embodiments, each reaction layer is provided with a corresponding detection element and is connected to one of the output parts of the feeding device. Each detection element is arranged along the height direction of the vessel body and is installed in a staggered manner on opposite sides of the inner wall of the vessel body.

[0008] In some embodiments, the output section includes a distributing pipe and a plurality of conveying pipes. The distributing pipe is horizontally fitted and installed on the outside of the vessel body, and a plurality of conveying pipes are provided on its inner side. One end of the conveying pipe is connected to the distributing pipe, and the other end of the conveying pipe passes through one side of the vessel body and communicates with the interior of the vessel body. The conveying pipe extends from the outside of the vessel body to the middle of the vessel body and gradually slopes downward. A plurality of discharge holes are opened on the lower side of the conveying pipe along its length direction. The distributing pipe and the detection element in the corresponding reaction zone are installed at the same height on the vessel body.

[0009] In some embodiments, the stirring device includes a stirring element and a driving element. The stirring element includes a central shaft and a plurality of stirring groups. The central shaft is vertically and centrally installed inside the vessel body, with its top and bottom ends rotatably connected to the vessel body. The plurality of stirring groups are evenly distributed along the length of the central shaft. Each stirring group includes a stirring paddle arranged circumferentially along the central shaft. The stirring paddle is fixedly connected to the central shaft and is staggered from the conveying pipe.

[0010] In some embodiments, the reaction vessel for neutralizing and removing impurities from laterite nickel ore further includes a material conveying module. The material conveying module includes a slurry conveying module and a neutralizing agent conveying module. The slurry conveying module includes a first main pipe and a plurality of first branch pipes. One end of the first main pipe is connected to the slurry conveying unit, and the other end of the first main pipe is connected to the input ends of the plurality of first branch pipes. A first valve is installed on the first branch pipe, and the output ends of the plurality of first branch pipes are respectively connected to the plurality of output sections. The neutralizing agent conveying module includes a second main pipe and a plurality of second branch pipes. One end of the second main pipe is connected to the neutralizing agent conveying unit, and the other end of the second main pipe is connected to the input ends of the plurality of second branch pipes. A second valve is installed on the second branch pipe, and the output ends of the plurality of second branch pipes are respectively connected to the plurality of output sections.

[0011] Compared with the prior art, the beneficial effects of the present invention include: by setting up a vessel body, a feeding device, and a detection device, several reaction layers are arranged inside the vessel body along its height direction. The outlets of several output sections of the feeding device are respectively connected to several reaction layers, allowing slurry or neutralizing agent to be delivered into the vessel body. The delivery of slurry or neutralizing agent is mainly controlled by a first valve and a second valve. When the first valve is opened, the slurry can enter the corresponding reaction layer inside the vessel body through the output section. When the second valve is opened, the neutralizing agent can enter the corresponding reaction layer inside the vessel body through the output section. Simultaneously, At least one detection element is provided in each reaction layer to detect the pH value of the slurry inside the reaction layer. The first valve and the second valve can be controlled to open or close based on the detected pH value, thereby controlling the slurry or neutralizing agent to be discharged to the corresponding reaction layer through the output part. This achieves the goal of controlling the output part to deliver slurry or neutralizing agent to the corresponding reaction layer based on the pH value detection in each reaction layer in the reactor, realizing the layered control and adjustment of the pH value of the slurry inside the reactor, so that the pH value of the slurry in all parts of the reactor is kept within a suitable range, avoiding large pH value differences and local over-alkalinity.

[0012] The stirring device can be used to stir the slurry inside the vessel, so that the input slurry or neutralizing agent can be uniformly mixed with the original slurry inside the vessel. This helps to reduce the difference in the actual measured pH value and improve the impurity removal efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the reaction vessel for neutralizing and removing impurities from laterite nickel ore provided by the present invention;

[0014] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the reactor body and internal installation structure for neutralizing and removing impurities from laterite nickel ore.

[0015] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0016] Figure 4 yes Figure 1 A top view of the output section of the reactor used for neutralizing and removing impurities from laterite nickel ore.

[0017] In the picture:

[0018] 1. Reactor body; 11. Reaction layer;

[0019] 2. Feeding device; 21. Output section; 211. Distribution pipe; 212. Conveying pipe; 213. Discharge hole; 22. First valve; 23. Second valve;

[0020] 3. Detection device;

[0021] 4. Stirring device; 41. Stirring component; 411. Central shaft; 412. Stirring paddle; 42. Driving component;

[0022] 5. Slurry conveying module; 51. First main pipe; 52. First branch pipe;

[0023] 6. Neutralizing agent delivery module; 61. Second main pipe; 62. Second branch pipe;

[0024] 7. Slurry conveying unit;

[0025] 8. Neutralizing agent delivery unit. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figure 1As shown, the present invention provides a reaction vessel for neutralizing and removing impurities from laterite nickel ore, comprising: a vessel body 1, a feeding device 2, a detection device 3, and a stirring device 4. The interior of the vessel body 1 has a plurality of reaction layers 11 formed along its height. The feeding device 2 includes a plurality of output sections 21, the outlets of which are respectively connected to the plurality of reaction layers 11. The inlet of each output section 21 is respectively connected to a slurry conveying unit 7 for conveying slurry and a neutralizing agent conveying unit 8 for conveying neutralizing agent. A third [unclear - possibly a device name] is provided between the pipes connected to the slurry conveying unit 7 and the neutralizing agent conveying unit 8. A valve 22 and a second valve 23 are provided; the detection device 3 has a plurality of detection elements, and each reaction layer 11 has at least one detection element to detect the pH value of the slurry inside the reaction layer 11. Each detection element is electrically connected to the first valve 22 and the second valve 23 of the corresponding conveying section in the reaction layer 11 through a controller, so as to control the opening and closing of the first valve 22 and the second valve 23 according to the detected pH value, so as to control the slurry or neutralizing agent to be discharged to the corresponding reaction layer 11 via the output section 21; the stirring end of the stirring device 4 is rotatably disposed inside the reactor body 1 for stirring the slurry.

[0028] In this device, several reaction layers 11 are arranged along the height direction inside the vessel body 1, and several output sections 21 are also provided. The outlets of the output sections 21 are respectively connected to the reaction layers 11. The inlet of each output section 21 is respectively connected to a slurry conveying unit 7 for conveying slurry and a neutralizing agent conveying unit 8 for conveying neutralizing agent. A first valve 22 and a second valve 23 are respectively provided between the pipes connecting the output section 21 to the slurry conveying unit 7 and the neutralizing agent conveying unit 8. When the first valve 22 is opened, the slurry can enter the corresponding reaction layer 11 inside the vessel body 1 through the output section 21. When the second valve 23 is opened, the neutralizing agent can enter the corresponding reaction layer 11 inside the vessel body 1 through the output section 21. At the same time, At least one detection element is provided in each reaction layer 11 to detect the pH value of the slurry inside the reaction layer 11. The detection element is electrically connected to the first valve 22 and the second valve 23, and can control the opening and closing of the first valve 22 and the second valve 23 according to the detected pH value, thereby controlling the discharge of slurry or neutralizing agent to the corresponding reaction layer 11 through the output part 21. This achieves control of the output part 21 to deliver slurry or neutralizing agent to the corresponding reaction layer 11 according to the detection status of each reaction layer 11 in the reactor body 1, realizing the separate control of the pH value of the slurry in multiple reaction layers 11. Finally, the stirring end of the stirring device 4 rotates inside the reactor body 1 to stir the slurry, so that the slurry in all parts of the reactor body 1 is kept within a suitable range, avoiding large pH differences and local over-alkalinity.

[0029] It should be noted that the reaction layers 11 are only set up to facilitate the control of the pH value of the slurry inside the vessel body 1. All reaction layers 11 are interconnected and are not separated by any structure. Each of the aforementioned detection elements is electrically connected to the first valve 22 and the second valve 23 of the corresponding conveying section in the reaction layer 11 via a controller. The detection element is used to detect the actual pH value of the slurry, while the controller is used to receive the detection signal fed back by the detection element and compare the actual pH value with the preset pH value, thereby controlling the opening and closing of the first valve 22 and the second valve 23.

[0030] Specifically, in some embodiments, the opening and closing of the first valve 22 and the second valve 23 have three different states: both valves are closed simultaneously, the first valve 22 is closed and the second valve 23 is open, and the first valve 22 is open and the second valve 23 is closed. There is no state where both valves are open simultaneously. Each detection element is electrically connected to the first valve 22 and the second valve 23 of the output section 21 corresponding to its reaction layer 11. When the pH value detected by the detection element is below a set value, the detection element can control the first valve 22 to close and the second valve 23 to open, allowing the neutralizing agent to enter the output section 21 and be distributed through the output section 21 to... A neutralizing agent is added to the reaction layer 11 to increase the pH value, facilitating the aluminum chromium precipitation process. When the pH value detected by the detector reaches the set value, the first valve 22 is opened and the second valve 23 is closed to allow the slurry to enter the output section 21. The slurry is then transported into the reaction layer 11 through the output section 21. When the pH value of the slurry in the reactor body 1 reaches the set value and the slurry level in the reactor body 1 reaches the set height, the first valve 22 and the second valve 23 can be closed simultaneously to allow the slurry to react inside the reactor body 1. Specifically, the slurry level can be monitored by installing a level sensor on the top of the inner wall of the reactor body 1.

[0031] It should be noted that in this embodiment, the detection device is a pH meter, which is existing technology and is mainly used to accurately measure the acidity or alkalinity value of liquid media. It is widely used in industry, agriculture, scientific research, environmental protection and other fields.

[0032] To reduce equipment costs, such as Figure 1 , Figure 2 As shown, in some embodiments, each reaction layer 11 is provided with a corresponding detection element, and each reaction layer 11 is connected to one of the output sections 21 of the feeding device 2. Furthermore, the dispensing pipe 211 and the detection element in the corresponding reaction zone are installed at the same height on the vessel body 1. Further, in this embodiment, there are five reaction layers 11, and correspondingly, five sets of detection elements and output sections 21 are provided. The height of the vessel body 1 is 1500 mm, wherein the height of each reaction layer 11 is 260 mm.

[0033] In order for multiple sensors to accurately reflect the pH value of the slurry inside vessel 1, such as Figure 1 As shown, in some embodiments, each of the detection elements is arranged along the height direction of the vessel body 1 and is installed in a staggered manner on opposite sides of the inner wall of the vessel body 1, so that the detection elements are staggered on both sides of the inner wall of the vessel body 1, which can not only meet the detection of each reaction layer 11, but also detect the pH value at different positions in two adjacent reaction layers 11.

[0034] The stirring end of the stirring device 4 is rotatably disposed inside the vessel body 1 for stirring the slurry, such as... Figure 1 , Figure 2 As shown, in some embodiments, the stirring device 4 includes a stirring element 41 and a driving element 42. The driving element 42 is preferably a motor. The stirring element 41 is the stirring end of the stirring device 4. The stirring element 41 includes a central shaft 411 and several stirring groups. The central shaft 411 is vertically and centrally installed inside the vessel body 1. Specifically, the top end of the central shaft 411 is rotatably installed on the top of the vessel body 1 through a bearing, and the bottom end of the central shaft 411 is mounted with a mounting bracket through a bearing. The mounting bracket is fixed to the bottom of the vessel body 1, and the central shaft 411 is rotatably connected to the mounting bracket. Several stirring groups are evenly distributed along the length direction of the central shaft 411. Each stirring group includes a stirring paddle 412 arranged circumferentially along the central shaft 411. The stirring paddle 412 is fixedly connected to the central shaft 411. In practice, the driving element 42 drives the central shaft 411 to rotate, thereby driving the stirring paddle 412 to rotate and thus stirring the slurry. To prevent the agitator 412 from colliding with the delivery pipe 212 during rotation, the agitator 412 and the delivery pipe 212 are arranged in a staggered manner.

[0035] Output unit 21 can output slurry or neutralizing agent into reaction layer 11. To facilitate the mixing of the output slurry or neutralizing agent with the original slurry in vessel 1, such as... Figures 1 to 4 As shown, in some embodiments, the output section 21 includes a distribution pipe 211 and several conveying pipes 212. The distribution pipe 211 has a circular structure and is horizontally fitted onto the outside of the reactor body 1. Several conveying pipes 212 are arranged on its inner side. In this embodiment, six conveying pipes 212 are provided and are evenly arranged on the inner side of the distribution pipe 211, so that the multiple conveying pipes 212 are evenly arranged around the reactor body 1. One end of the conveying pipe 212 is connected to the distribution pipe 211, and the other end of the conveying pipe 212 passes through one side of the reactor body 1 and communicates with the interior of the reactor body 1. In practice, the slurry or neutralizing agent first enters the distribution pipe 211 and is distributed to each part of the distribution pipe 211. Then, it enters the conveying pipe 212 through the distribution pipe 211 and is distributed to each side of the reaction layer 11 through the discharge holes 213 of the conveying pipe 212.

[0036] Furthermore, the feed pipe 211 needs to be connected to the slurry conveying unit 7 and the neutralizing agent conveying unit 8 in a switchable manner. Therefore, a material conveying module is also provided on the reactor. The material conveying module includes a slurry conveying module 5 and a neutralizing agent conveying module 6. The slurry conveying module 5 includes a first main pipe 51 and several first branch pipes 52. One end of the first main pipe 51 is connected to the slurry conveying unit 7, and the other end of the first main pipe 51 is connected to the input end of several first branch pipes 52. The first branch pipes 52 are equipped with first valves 22, and the output ends of several first branch pipes 52 are respectively connected to several output sections 21. The neutralizing agent conveying module 6 includes a second main pipe 61 and several second branch pipes 62. One end of the second main pipe 61 is connected to the neutralizing agent conveying unit 8, and the other end of the second main pipe 61 is connected to the input end of several second branch pipes 62. The second branch pipes 62 are equipped with second valves 23, and the output ends of several second branch pipes 62 are respectively connected to several output sections 21. Specifically, each feed pipe 211 is connected to a first branch pipe 52 and a second branch pipe 62. The first branch pipe 52 and the second branch pipe 62 are respectively equipped with a first valve 22 and a second valve 23. Multiple first branch pipes 52 are connected to slurry through a first main pipe 51, and multiple second branch pipes 62 are connected to neutralizing agent through a second main pipe 61. Therefore, by controlling the opening and closing of the first valve 22 and the second valve 23, the output section 21 can transport slurry or neutralizing agent.

[0037] Furthermore, in order to further ensure that the input slurry or neutralizing agent is evenly distributed inside the vessel body 1, such as... Figure 3 As shown, in some embodiments, the conveying pipe 212 extends from the outside of the vessel body 1 towards the middle of the vessel body 1 and gradually slopes downward. The lower side of the conveying pipe 212 has several discharge holes 213 along its length, allowing materials to be discharged at different heights of the reaction layer 11. Of course, in other embodiments, the conveying pipe 212 can also be configured to slope upward from the outside to the inside.

[0038] During implementation, the detection device measures the pH value of the slurry at various locations. When the detection device detects that the pH value of the slurry in the corresponding reaction layer 11 is below a set value, the detection device can control the first valve 22 of the output section 21 corresponding to that reaction layer 11 to close and the second valve 23 to open, so that the neutralizing agent can enter the corresponding reaction layer 11 sequentially through the second main pipe 61, the second branch pipe 62, the distribution pipe 211, and the conveying pipe 212, adding the neutralizing agent into the reaction layer 11; when the detection device detects that the pH value of the slurry in the corresponding reaction layer ... so that the neutralizing agent can enter the corresponding reaction layer 11. When the pH value of the slurry in 11 reaches the set value, the first valve 22 is opened and the second valve 23 is closed, so that the slurry can enter the corresponding reaction layer 11 through the first main pipe 51, the first branch pipe 52, the distribution pipe 211 and the conveying pipe 212 in sequence, and the slurry is transported into the reaction layer 11. When the pH value of the slurry in the reactor 1 reaches the set value and the slurry level in the reactor 1 reaches the set height, the first valve 22 and the second valve 23 can be closed at the same time so that the slurry can react inside the reactor 1.

[0039] This invention, through the arrangement of a vessel body 1, a feeding device 2, and a detection device 3, establishes several reaction layers 11 along the height direction inside the vessel body 1. The outlets of several output sections 21 of the feeding device 2 are respectively connected to several reaction layers 11, allowing the delivery of slurry or neutralizing agent into the vessel body 1. The delivery of slurry or neutralizing agent is mainly controlled by a first valve 22 and a second valve 23. When the first valve 22 is opened, the slurry can enter the corresponding reaction layer 11 inside the vessel body 1 through the output section 21. When the second valve 23 is opened, the neutralizing agent can enter the corresponding reaction layer 11 inside the vessel body 1 through the output section 21. Simultaneously, in each... At least one detection element is provided in the reaction layer 11 to detect the pH value of the slurry inside the reaction layer 11. It can control the opening and closing of the first valve 22 and the second valve 23 according to the detected pH value, thereby controlling the slurry or neutralizing agent to be discharged to the corresponding reaction layer 11 through the output part 21. This realizes the control of the output part 21 to deliver slurry or neutralizing agent to the corresponding reaction layer 11 according to the pH value detection in each reaction layer 11 in the reactor body 1, so as to realize the layered control and adjustment of the pH value of the slurry inside the reactor body 1, so that the pH value of the slurry in all parts of the reactor body 1 is kept within a suitable range, avoiding large pH value differences and local over-alkalinity.

[0040] The present invention uses a stirring device 4 to stir the slurry inside the vessel 1, so that the input slurry or neutralizing agent is uniformly mixed with the original slurry inside the vessel 1, which helps to reduce the difference in the actual measured pH value and improve the impurity removal efficiency.

[0041] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A reaction vessel for neutralizing and removing impurities from laterite nickel ore, characterized in that, include: The vessel body has several reaction layers formed inside it along its height direction; The feeding device includes several output sections, the outlets of the several output sections are respectively connected to several reaction layers, and the inlet of each output section is respectively connected to a slurry conveying unit for conveying slurry and a neutralizing agent conveying unit for conveying neutralizing agent, and a first valve and a second valve are respectively provided between the pipes connected to the slurry conveying unit and the neutralizing agent conveying unit. A detection device comprising a plurality of detection elements, with at least one detection element in each reaction layer, for detecting the pH value of the slurry within the reaction layer. Each detection element is electrically connected via a controller to a first valve and a second valve of a corresponding conveying section in the reaction layer, thereby controlling the opening and closing of the first and second valves based on the detected pH value, and controlling the discharge of the slurry or neutralizing agent via the output section to the corresponding reaction layer. A stirring device, wherein the stirring end of the stirring device is rotatably disposed inside the vessel body for stirring the slurry.

2. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 1, characterized in that, When the pH value detected by the detection device is below the set value, the first valve is closed and the second valve is opened to allow the neutralizing agent to enter the output section. The neutralizing agent is then added to the reaction layer through the output section to increase the pH value. When the pH value detected by the detector reaches the set value, the first valve is opened and the second valve is closed to allow the slurry to enter the output section and be transported into the reaction layer through the output section.

3. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 1, characterized in that, Each of the reaction layers is provided with a corresponding detection element, which is connected to one of the output sections of the feeding device.

4. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 1, characterized in that, Each of the aforementioned testing components is arranged along the height direction of the vessel body and is installed sequentially and staggered on opposite sides of the inner wall of the vessel body.

5. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 1, characterized in that, The output section includes a dispensing pipe and several conveying pipes. The material distribution pipe is horizontally fitted and installed on the outside of the vessel body, and a number of conveying pipes are provided on its inner side; One end of the conveying pipe is connected to the distributing pipe, and the other end of the conveying pipe passes through one side of the vessel body and communicates with the interior of the vessel body.

6. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 5, characterized in that, The conveying pipe extends from the outside of the vessel body to the middle of the vessel body and gradually slopes downward, and several discharge holes are opened on the lower side of the conveying pipe along its length.

7. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 5, characterized in that, The feed pipe and the corresponding detection element in the reaction zone are installed at the same height on the reactor body.

8. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 5, characterized in that, The stirring device includes a stirring component and a driving component. The stirring component includes a central shaft and several stirring groups. The central shaft is vertically and centrally installed inside the vessel body, with its top and bottom ends rotatably connected to the vessel body. The several stirring groups are evenly distributed along the length of the central shaft. Each stirring group includes a stirring paddle arranged circumferentially along the central shaft, and the stirring paddle is fixedly connected to the central shaft.

9. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 8, characterized in that, The stirring paddle is staggered from the conveying pipe.

10. The reaction vessel for neutralizing and removing impurities from laterite nickel ore according to claim 1, characterized in that, The reaction vessel for neutralizing and removing impurities from laterite nickel ore also includes a material conveying module, which comprises a slurry conveying module and a neutralizing agent conveying module. The slurry conveying module includes a first main pipe and several first branch pipes. One end of the first main pipe is connected to the slurry conveying unit, and the other end of the first main pipe is connected to the input end of several first branch pipes. The first valve is installed on the first branch pipe, and the output end of several first branch pipes is connected to several output sections respectively. The neutralizing agent delivery module includes a second main pipe and several second branch pipes. One end of the second main pipe is connected to the neutralizing agent delivery unit, and the other end of the second main pipe is connected to the input end of several second branch pipes. The second branch pipes are equipped with second valves, and the output ends of several second branch pipes are respectively connected to several output sections.

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