Reaction kettle for neutralization and impurity removal of laterite nickel ore

Abstract

The present invention belongs to the technical field of metallurgy. Disclosed is a reaction kettle for the neutralization and impurity removal of a laterite nickel ore. The reaction kettle comprises a kettle body, a feeding device, a detection device and a stirring device, wherein a plurality of reaction layers are formed inside the kettle body in a height direction of the kettle body; the feeding device comprises a plurality of output portions, wherein outlets of the plurality of output portions are respectively in communication with the plurality of reaction layers, and an inlet of each output portion is in communication with both a slurry conveying unit for conveying slurry and a neutralizer conveying unit for conveying a neutralizer, and a first valve and a second valve are provided between pipelines which are in communication with the slurry conveying unit and the neutralizer conveying unit; and the detection device is provided with a plurality of detection members, each reaction layer being internally provided with at least one detection member. The present invention provides layered control and adjustment of the pH value of the slurry in the kettle body, such that the pH value of the slurry at each position in the kettle body is kept within a proper range, thus avoiding large differences in pH values and local over-alkalinity.

Description

A reactor for neutralizing and removing impurities from laterite nickel ore Technical Field

[0001] The invention relates to the technical field of metallurgy, in particular to a reactor for neutralizing and removing impurities from laterite nickel ore. Background Art

[0002] Nickel laterites contain 65% to 70% of the total nickel reserves on land, making them a crucial mineral for the smelting of nickel and nickel-based compounds. Laterite nickel ores can be broadly divided into three types: limonitic, transitional, and saprolitic. Generally speaking, saprolitic nickel ores with nickel contents above 1.8% are best produced using the RKEF pyrometallurgical process, while limonitic and transitional nickel ores with nickel contents below 1.8% are best produced using hydrometallurgical processes such as high-pressure acid leaching and atmospheric pressure acid leaching.

[0003] Publication No. CN116411179A provides a wet treatment process for laterite nickel ore, comprising step S1, high-pressure acid leaching of the laterite nickel ore, solid-liquid separation and washing to obtain a filtrate and a filtrate residue; step S2, alkali-washing the filtrate residue with an alkali solution to obtain hematite; step S3, pressurizing the filtrate to remove iron from the filtrate to obtain a hematite product and a de-ironized liquid; step S4, neutralizing and de-ironizing the de-ironized liquid with a first neutralizer to obtain a neutralized residue and a neutralized de-ironized liquid; step S5, precipitating aluminum and chromium on the neutralized de-ironized liquid with a second neutralizer to obtain an aluminum-chromium slag and a de-ironized aluminum liquid; step S6, precipitating nickel, cobalt and manganese on the de-ironized aluminum liquid with a third neutralizer and an oxidant to obtain a crude nickel, cobalt and manganese hydroxide precipitate and a precipitated liquid; and step S7, The precipitated liquid is subjected to magnesium recovery treatment to obtain a basic magnesium carbonate product and a tail liquid; in the above-mentioned prior art, steps S4, S5 and S6 all utilize a neutralizer to perform neutralization and iron removal treatment, aluminum chromium precipitation treatment, and nickel, cobalt and manganese precipitation treatment, respectively, wherein the iron removal, aluminum chromium removal unit and the like mainly remove impurities from the liquid phase of the leachate. During the treatment, the leachate is transported to a reactor and a neutralizer is added thereto, and the reactor is used for treatment. The impurity removal method is to gradually increase the pH value by adding a neutralizer. However, during the treatment process, due to the large capacity of the reactor, it is difficult to evenly mix the neutralizer and the slurry when the neutralizer and the slurry are directly transported thereto, and there will be a local over-alkali phenomenon at the location where the neutralizer is added, which can easily lead to a large difference in the pH value of the slurry at various locations inside the reactor, thereby affecting the treatment efficiency.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a reactor for neutralizing and removing impurities from laterite nickel ore, so as to solve the technical problem in the prior art that the pH value difference of the ore pulp at different locations inside the reactor is large, affecting the treatment efficiency.

[0006] To achieve the above technical objectives, the technical solution of the present invention provides a reactor for neutralizing and removing impurities from laterite nickel ore, comprising: a reactor body, a feeding device, a detection device, and a stirring device. The interior of the reactor body is formed with several reaction layers along its height direction; the feeding device includes several output parts, the outlets of several output parts are respectively connected to the several reaction layers, and the inlet of each output part is respectively connected to a slurry conveying unit for conveying slurry and a neutralizer conveying unit for conveying neutralizer, and a first valve and a second valve are respectively provided between the pipelines connected to the slurry conveying unit and the neutralizer conveying unit; the detection device has several detection elements, at least one detection element in each reaction layer, for detecting the pH value of the slurry in the reaction layer, and each detection element is electrically connected to the first valve and the second valve of the conveying unit in the corresponding reaction layer through a controller, so as to control the opening and closing of the first valve and the second valve according to the detected pH value, thereby controlling the discharge of the slurry or neutralizer through the output part to the corresponding reaction layer; and the stirring end of the stirring device is rotatably disposed inside the reactor body to stir the slurry.

[0007] In some embodiments, when the pH value detected by the detection element is below a set value, the first valve is controlled to be closed and the second valve is controlled to be opened to allow the neutralizer to enter the output part, and the neutralizer is added to the reaction layer through the output part to increase the pH value; when the pH value detected by the detection element reaches a set value, the first valve is controlled to be opened and the second valve is controlled to be closed to allow the slurry to enter the output part, and the slurry is transported to the reaction layer through the output part.

[0008] In some embodiments, a detection component is correspondingly provided in each reaction layer and is connected to an output portion of the feeding device. Each detection component is arranged along the height direction of the kettle body and is staggered and installed in sequence on opposite sides of the inner wall of the kettle body.

[0009] In some embodiments, the output part includes a distribution pipe and several conveying pipes, the distribution pipe is horizontally embedded and installed on the outside of the kettle body, and several conveying pipes are arranged on the inside thereof; one end of the conveying pipe is connected with the distribution pipe, and the other end of the conveying pipe passes through one side of the kettle body and is connected with the interior of the kettle body, the conveying pipe extends from the outside of the kettle body to the middle of the kettle body, and gradually tilts downward, and the lower side of the conveying pipe is provided with several discharge holes along its length direction, and the distribution pipe and the detection part in the corresponding reaction zone are installed at the same height of the kettle body.

[0010] In some embodiments, the stirring device includes a stirring member and a driving member, the stirring member includes a central shaft and several stirring groups, the central shaft is vertically and centrally installed inside the kettle body, and its top and bottom ends are rotatably connected to the kettle body, and several stirring groups are evenly distributed along the length direction 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 the stirring paddle is staggered with the conveying pipe.

[0011] In some embodiments, the reactor for neutralization and impurity removal of laterite nickel ore further includes a material conveying module, the material conveying module including a slurry conveying module and a neutralizer conveying module, the slurry conveying module including a first main pipe and several first branch pipes, one end of the first main pipe is connected to the slurry conveying unit, the other end of the first main pipe is connected to the input ends of several first branch pipes, the first branch pipe is installed with the first valve, and the output ends of several first branch pipes are respectively connected to several output parts; the neutralizer conveying module includes a second main pipe and several second branch pipes, one end of the second main pipe is connected to the neutralizer conveying unit, the other end of the second main pipe is connected to the input ends of several second branches, the second branch pipe is installed with the second valve, and the output ends of several second branches are respectively connected to several output parts.

[0012] Compared with the prior art, the beneficial effects of the present invention include: by setting the kettle body, feeding device and detection device, a plurality of reaction layers are set in the interior of the kettle body along its height direction; the outlets of the plurality of output parts of the feeding device are respectively connected to the plurality of reaction layers, and the slurry or neutralizer can be transported to the interior of the kettle body; the transport of the slurry or neutralizer is mainly controlled by the first valve and the second valve; when the first valve is opened, the slurry can enter the corresponding reaction layer inside the kettle body through the output part; when the second valve is opened, the neutralizer can enter the corresponding reaction layer inside the kettle body through the output part; at the same time, At least one detection element is provided in each of the reaction layers, which is used to detect the pH value of the slurry inside the reaction layer. The detection element can control the opening and closing of the first valve and the second valve according to the detected pH value, thereby controlling the slurry or neutralizer to be discharged to the corresponding reaction layer through the output portion, so as to realize the control of the corresponding output portion to deliver the slurry or neutralizer to the corresponding reaction layer according to the pH value detection condition of each reaction layer in the kettle body, thereby realizing the layered control and adjustment of the pH value of the slurry inside the kettle body, so that the pH value of the slurry at various locations inside the kettle body is maintained within an appropriate range, thereby avoiding large pH value differences and local over-alkalinity.

[0013] By setting up a stirring device, the stirring end of the stirring device can stir the ore pulp inside the kettle body, so that the input ore pulp or neutralizer is evenly mixed with the original ore pulp inside the kettle body, which is beneficial to reducing the difference in the actual measured pH value and improving the impurity removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic diagram of the overall structure of an embodiment of a reactor for neutralization and impurity removal of laterite nickel ore provided by the present invention;

[0015] FIG2 is a schematic cross-sectional view of the kettle body and internal mounting structure of the reactor for neutralizing and removing impurities from laterite nickel ore in FIG1 ;

[0016] Figure 3 is an enlarged view of point A in Figure 2;

[0017] FIG4 is a schematic top view of the output portion of the reactor for neutralization and impurity removal of laterite nickel ore in FIG1 .

[0018] In the figure: 1. Kettle body; 11. Reaction layer; 2. Feeding device; 21. Output part; 211. Distribution pipe; 212. Delivery pipe; 213. Discharge hole; 22. First valve; 23. Second valve; 3. Detection device; 4. Stirring device; 41. Stirring element; 411. Central shaft; 412. Stirring paddle; 42. Driving element; 5. Slurry delivery module; 51. First main pipe; 52. First branch pipe; 6. Neutralizer delivery module; 61. Second main pipe; 62. Second branch pipe; 7. Slurry delivery unit; 8. Neutralizer delivery unit. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0020] As shown in FIG1 , the present invention provides a reactor for neutralizing and removing impurities from laterite nickel ore, comprising: a reactor body 1, a feeding device 2, a detection device 3, and a stirring device 4. The interior of the reactor body 1 is formed with a plurality of reaction layers 11 along its height direction; the feeding device 2 includes a plurality of output parts 21, the outlets of the plurality of output parts 21 are respectively connected to the plurality of reaction layers 11, and the inlet of each output part 21 is respectively connected to a slurry conveying unit 7 for conveying slurry and a neutralizer conveying unit 8 for conveying a neutralizer, and a detection device 3 is respectively provided between the pipelines connected to the slurry conveying unit 7 and the neutralizer conveying unit 8. A first valve 22 and a second valve 23; the detection device 3 has a plurality of detection components, each of the reaction layers 11 has at least one detection component, for detecting the pH value of the slurry inside the reaction layer 11, and each of the detection components is electrically connected to the first valve 22 and the second valve 23 of the conveying section corresponding to 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 discharge of the slurry or neutralizer to the corresponding reaction layer 11 through the output section 21; the stirring end of the stirring device 4 is rotatably disposed inside the kettle body 1 for stirring the slurry.

[0021] In this device, a plurality of reaction layers 11 are arranged inside the kettle body 1 along its height direction, and a plurality of output parts 21 are also provided. The outlets of the plurality of output parts 21 are respectively communicated with the plurality of reaction layers 11, and the inlet of each of the output parts 21 is respectively communicated with the slurry conveying unit 7 for conveying slurry and the neutralizer conveying unit 8 for conveying neutralizer. A first valve 22 and a second valve 23 are respectively provided between the output part 21 and the pipelines communicating with the slurry conveying unit 7 and the neutralizer conveying unit 8. When the first valve 22 is opened, the slurry can enter the corresponding reaction layer 11 inside the kettle body 1 through the output part 21. When the second valve 23 is opened, the neutralizer can enter the corresponding reaction layer 11 inside the kettle body 1 through the output part 21. At the same time, At least one detection element is provided in each reaction layer 11, which is used 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 slurry or neutralizer to be discharged to the corresponding reaction layer 11 through the output part 21, so as to realize the control of the output part 21 to deliver the slurry or neutralizer to the corresponding reaction layer 11 according to the detection conditions of each reaction layer 11 in the kettle body 1, thereby 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 kettle body 1 to stir the slurry, so that the slurry at various locations inside the kettle body 1 is kept within an appropriate range, avoiding large differences in pH values ​​and local over-alkalinity.

[0022] It should be noted that the reaction layer 11 is provided solely to facilitate control of the pH value of the slurry within the kettle body 1. Each reaction layer 11 is interconnected and not separated by any structure. 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 via a controller. The detection element detects the actual pH value of the slurry, while the controller receives the detection signal fed back by the detection element and compares the actual pH value with a preset pH value, thereby controlling the opening and closing of the first valve 22 and the second valve 23.

[0023] Specifically, in some embodiments, the first valve 22 and the second valve 23 are turned on and off in three different situations, namely, the two valves are closed at the same time, or the first valve 22 is closed and the second valve 23 is opened, and the first valve 22 is opened and the second valve 23 is closed. There is no state where the two valves are opened at the same time, and each detection element is electrically connected to the first valve 22 and the second valve 23 of the output portion 21 corresponding to the reaction layer 11 in which it is located. When the pH value detected by the detection element is below the set value, the detection element can control the first valve 22 to close and the second valve 23 to open, so that the neutralizer can enter the output portion 21 and pass through the output portion 21 to the neutralizer. A neutralizing agent is added to the reaction layer 11 to increase the pH value to facilitate aluminum-chromium precipitation treatment. When the pH value detected by the detection element reaches a set value, the first valve 22 is controlled to open and the second valve 23 is closed to allow the slurry to enter the output part 21. The slurry is transported to the reaction layer 11 through the output part 21. When the pH value of the slurry in the kettle body 1 reaches a set value and the liquid level of the slurry transported in the kettle body 1 reaches a set height, the first valve 22 and the second valve 23 can be controlled to close at the same time so that the slurry reacts inside the kettle body 1. Specifically, the liquid level of the slurry can be monitored by setting a liquid level sensor on the top of the inner wall of the kettle body 1.

[0024] It should be noted that, in this embodiment, the detection component adopts a pH meter, which is a prior art and is mainly used to accurately measure the pH value of liquid media and is widely used in industry, agriculture, scientific research, environmental protection and other fields.

[0025] To reduce equipment costs, as shown in Figures 1 and 2, in some embodiments, each reaction layer 11 is provided with a corresponding detection element, and each reaction layer 11 is connected to an output portion 21 of the feeding device 2. Furthermore, the distribution pipe 211 and the detection element in the corresponding reaction zone are installed at the same height of the kettle body 1. Furthermore, in this embodiment, there are five reaction layers 11, and correspondingly, five groups of detection elements and output portions 21 are provided. The height of the kettle body 1 is 1500 mm, and the height of each reaction layer 11 is 260 mm.

[0026] In order to enable multiple detection components to accurately feedback the pH value of the slurry inside the kettle body 1, as shown in Figure 1, in some embodiments, each of the detection components is arranged along the height direction of the kettle body 1, and is staggered and installed in sequence on opposite sides of the inner wall of the kettle body 1, so that the detection components are staggered on both sides of the inner wall of the kettle body 1, which can not only meet the detection of each reaction layer 11, but also detect the pH values ​​at different positions in two adjacent reaction layers 11.

[0027] The stirring end of the stirring device 4 is rotatably arranged inside the kettle body 1 for stirring the slurry, as shown in Figures 1 and 2. In some embodiments, the stirring device 4 includes a stirring member 41 and a driving member 42, the driving member 42 is preferably a motor, the stirring member 41 is the stirring end of the stirring device 4, the stirring member 41 includes a central shaft 411 and a plurality of stirring groups, the central shaft 411 is vertically and centrally installed inside the kettle body 1, specifically, the top of the central shaft 411 is rotatably mounted on the top of the kettle body 1 through a bearing, the bottom end of the central shaft 411 is mounted with a mounting frame through a bearing, the mounting frame is fixed to the bottom of the kettle body 1, the central shaft 411 is rotatably connected to the mounting frame, and the plurality of 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, and the stirring paddle 412 is fixedly connected to the central shaft 411. During implementation, the central shaft 411 is driven to rotate by the driving member 42 to drive the stirring paddle 412 to rotate, thereby stirring the slurry. In order to prevent the stirring paddle 412 from colliding with the delivery pipe 212 during rotation, the stirring paddle 412 and the delivery pipe 212 are staggered.

[0028] The output portion 21 can output the slurry or neutralizer into the reaction layer 11. In order to facilitate the mixing of the output slurry or neutralizer with the original slurry in the kettle body 1, as shown in Figures 1 to 4, in some embodiments, the output portion 21 includes a distribution pipe 211 and a plurality of delivery pipes 212. The distribution pipe 211 is a circular structure, which is horizontally nested and installed on the outside of the kettle body 1. A plurality of the delivery pipes 212 are arranged on the inside thereof. In this embodiment, six delivery pipes 212 are provided and are evenly arranged on the distribution pipe. 211, so that multiple conveying pipes 212 are evenly arranged around the kettle body 1; and 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 kettle body 1 and is connected to the interior of the kettle body 1. During implementation, the slurry or neutralizer first enters the distribution pipe 211 and is distributed to various places in the distribution pipe 211, and then enters the conveying pipe 212 through the distribution pipe 211, and is distributed to the surrounding sides of the reaction layer 11 through the discharge holes 213 of the conveying pipe 212.

[0029] Furthermore, the feed pipe 211 needs to be connected to the slurry conveying unit 7 and the neutralizer conveying unit 8 in a switchable manner. Therefore, a material conveying module is also provided on the reactor, and the material conveying module includes a slurry conveying module 5 and a neutralizer 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 pipe 52 is installed with the first valve 22, and the output ends of several first branch pipes 52 are respectively connected to several output parts 21; the neutralizer 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 neutralizer 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 pipe 62 is installed with the second valve 23, and the output ends of several second branch pipes 62 are respectively connected to several output parts 21. Specifically, each distribution pipe 211 is connected to a first branch pipe 52 and a second branch pipe 62. A first valve 22 and a second valve 23 are respectively provided on the first branch pipe 52 and the second branch pipe 62. Multiple first branch pipes 52 are connected to the slurry through the first main pipe 51, and multiple second branch pipes 62 are connected to the neutralizer through the second main pipe 61. Therefore, the output part 21 can transport the slurry or the neutralizer by controlling the opening and closing of the first valve 22 and the second valve 23.

[0030] Furthermore, to further evenly distribute the input slurry or neutralizing agent within the kettle 1, as shown in FIG3 , in some embodiments, the delivery pipe 212 extends from the outside of the kettle 1 to the middle of the kettle 1 and gradually slopes downward. A plurality of discharge holes 213 are provided along the lower side of the delivery pipe 212 along its length, allowing the material to be discharged at different heights of the reaction layer 11. Of course, in other embodiments, the delivery pipe 212 can also be arranged to slope upward from the outside to the inside.

[0031] During implementation, the detection component detects the pH value of the slurry at various locations. When the detection component detects that the pH value of the slurry in the corresponding reaction layer 11 is below the set value, the detection component can control the first valve 22 of the output part 21 corresponding to the reaction layer 11 to close and the second valve 23 to open, so that the neutralizer can enter the corresponding reaction layer 11 through the second main pipe 61, the second branch pipe 62, the distribution pipe 211 and the delivery pipe 212 in sequence, and add the neutralizer to the reaction layer 11; when the detection component detects that the pH value of the slurry in the corresponding reaction layer 11 is below the set value, the detection component can control the first valve 22 of the output part 21 corresponding to the reaction layer 11 to close and the second valve 23 to open, so that the neutralizer can enter the corresponding reaction layer 11 through the second main pipe 61, the second branch pipe 62, the distribution pipe 211 and the delivery pipe 212 in sequence, and add the neutralizer to the reaction layer 11; When the pH value of the slurry in 11 reaches the set value, the first valve 22 is controlled to open and the second valve 23 is closed, so that the slurry can pass through the first main pipe 51, the first branch pipe 52, the distribution pipe 211 and the conveying pipe 212 in sequence into the corresponding reaction layer 11, and the slurry is conveyed to the inside of the reaction layer 11. When the pH value of the slurry in the kettle body 1 reaches the set value and the liquid level of the slurry conveyed in the kettle body 1 reaches the set height, the first valve 22 and the second valve 23 can be controlled to close at the same time, so that the slurry can react inside the kettle body 1.

[0032] The present invention sets a plurality of reaction layers 11 in the interior of the kettle body 1 along its height direction by setting the kettle body 1, the feeding device 2 and the detection device 3. The outlets of the plurality of output parts 21 of the feeding device 2 are respectively connected to the plurality of reaction layers 11, and the slurry or neutralizer can be transported to the interior of the kettle body 1. The transport of the slurry or neutralizer is mainly controlled by the first valve 22 and the second valve 23. When the first valve 22 is opened, the slurry can enter the corresponding reaction layer 11 inside the kettle body 1 through the output part 21. When the second valve 23 is opened, the neutralizer can enter the corresponding reaction layer 11 inside the kettle body 1 through the output part 21. At the same time, at each At least one detection element is provided in the reaction layer 11, which is used to detect the pH value of the slurry in the reaction layer 11. The detection element 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 neutralizer to be discharged to the corresponding reaction layer 11 through the output portion 21, so as to realize the control of the corresponding output portion 21 to deliver the slurry or neutralizer to the corresponding reaction layer 11 according to the pH value detection condition in each reaction layer 11 in the kettle body 1, thereby realizing the layered control and adjustment of the pH value of the slurry in the kettle body 1, so that the pH value of the slurry in each part of the kettle body 1 is maintained within an appropriate range, avoiding the occurrence of large pH value differences and local alkalinity.

[0033] The present invention is provided with a stirring device 4, and the stirring end of the stirring device 4 can stir the ore pulp inside the kettle body 1, so that the input ore pulp or neutralizer is evenly mixed with the original ore pulp inside the kettle body 1, which is beneficial to reducing the difference in the actually measured pH value and improving the impurity removal efficiency.

[0034] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0036] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A reactor for neutralization and impurity removal of laterite nickel ore, characterized in that, it includes: A kettle body, and several reaction layers are formed inside the kettle body along its height direction; A feeding device, the feeding device includes several output parts, the outlets of several said output parts are respectively communicated with several said reaction layers, the inlets of each said output part are respectively communicated with a pulp conveying unit for conveying pulp and a neutralizing agent conveying unit for conveying a neutralizing agent, and a first valve and a second valve are respectively arranged between the pipelines communicated with the pulp conveying unit and the neutralizing agent conveying unit; A detection device, the detection device has several detection parts, at least one detection part is arranged in each said reaction layer to detect the pH value of the pulp inside the reaction layer, and each said detection part is electrically connected to the first valve and the second valve of the conveying part in the corresponding reaction layer through a controller to control the opening and closing of the first valve and the second valve according to the detected pH value, and control the pulp or the neutralizing agent to be discharged to the corresponding reaction layer through the output part; and, A stirring device, the stirring end of the stirring device is rotatably arranged inside the kettle body for stirring the pulp.

2. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 1, characterized in that, When the pH value detected by the detection part is below the set value, control the first valve to close and the second valve to open, so that the neutralizing agent enters the output part, and the neutralizing agent is added into the reaction layer through the output part to increase the pH value; When the pH value detected by the detection part reaches the set value, control the first valve to open and the second valve to close, so that the pulp enters the output part, and the pulp is conveyed into the reaction layer through the output part.

3. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 1, characterized in that, One said detection part is correspondingly arranged in each said reaction layer and is communicated with one said output part of the feeding device.

4. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 1, characterized in that, Each said detection part is arranged along the height direction of the kettle body and is installed on opposite sides of the inner wall of the kettle body in a staggered manner in sequence.

5. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 1, characterized in that, The output part includes a distributing pipe and several conveying pipes, The distributing pipe is horizontally sleeved and installed outside the kettle body, and several said conveying pipes are arranged inside it; One end of the conveying pipe is communicated with the distributing pipe, and the other end of the conveying pipe penetrates through one side of the kettle body and is communicated with the inside of the kettle body.

6. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 5, characterized in that, The conveying pipe extends from the outside of the kettle body towards the middle of the kettle body and gradually inclines downwards, and several discharging holes are arranged along the length direction on the lower side of the conveying pipe.

7. The reactor for neutralization and impurity removal of laterite nickel ore according to claim 5, characterized in that, The distributing pipe and the detection part in the corresponding reaction area are installed at the same height of the kettle body.

8. The reactor for neutralizing and removing impurities from laterite nickel ore according to claim 5, It is characterized in that The stirring device comprises a stirring member and a driving member. The stirring member includes a central axis and a plurality of stirring groups. The central axis is vertically and centrally installed inside the kettle body, and its top and bottom ends are rotatably connected to the kettle body. The plurality of stirring groups are evenly distributed along the length direction of the central axis. Each stirring group includes a stirring paddle arranged circumferentially along the central axis, and the stirring paddle is fixedly connected to the central axis.

9. The reactor for neutralizing and removing impurities from laterite nickel ore according to claim 8, It is characterized in that The stirring paddle and the conveying pipe are arranged in a staggered manner.

10. The reactor for neutralizing and removing impurities from laterite nickel ore according to claim 1, It is characterized in that The reactor for neutralization and impurity removal of laterite nickel ore also includes a material conveying module, which includes a slurry conveying module and a neutralizer conveying module. The slurry conveying module comprises 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, the other end of the first main pipe is connected to the input ends of the plurality of first branch pipes, the first branch pipe is provided with the first valve, and the output ends of the plurality of first branch pipes are respectively connected to the plurality of output parts; The neutralizer delivery module includes a second main pipe and a plurality of second branch pipes, one end of the second main pipe is connected to the neutralizer delivery unit, the other end of the second main pipe is connected to the input ends of the plurality of second branch pipes, the 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 parts.

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