A residue phase treatment system for a laterite nickel ore leachate after iron, aluminum and chromium removal

Abstract

The application discloses a kind of laterite nickel ore leaching liquid iron-aluminum-chromium-removed slag phase processing system, belong to laterite nickel ore slag phase processing technical field, including filtration module, refinement module, feed module and measurement module, filtration module includes suction assembly and filter component, suction assembly is used to set in the slag phase precipitation zone of multiple iron-aluminum-chromium-removing unit, and its suction port is communicated with slag phase precipitation zone, filter component is connected with the discharge port of suction assembly, filter component has a filter residue outlet and a filtrate outlet connected with multiple iron-aluminum-chromium-removing unit;Refinement module is connected with filter residue outlet;Feed module includes material pipe and material guiding driving part, material pipe has the feed end connected with the discharge port of refinement module;Measurement module is connected with material guiding driving part and circulating leaching ore slurry neutralization unit;The device can filter out the slag phase generated in time and carry out refinement treatment, and the returned filter residue is controlled, and the subsequent acid leaching dissolution efficiency of slag phase can be improved.

Description

Technical Field

[0001] This invention relates to the field of laterite nickel ore slag phase treatment technology, and in particular to a slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum and chromium removal. Background Technology

[0002] Lateritic nickel ore resources are surface weathering crust deposits formed by the weathering, leaching, and deposition of sulfide nickel ore rocks. Lateritic nickel ore is distributed in tropical countries within 30 degrees north and south of the equator, mainly in the tropical and subtropical regions of the Pacific Rim, including: Cuba and Brazil in the Americas; Indonesia and the Philippines in Southeast Asia; and Australia, New Caledonia, and Papua New Guinea in Oceania.

[0003] After processing, laterite nickel ore contains a significant amount of nickel, chromium, and manganese. Discarding it would result in a huge loss of nickel, cobalt, and manganese. CN110331283B discloses a method for treating acid leaching residue from laterite nickel ore. After a primary iron and aluminum removal process, calcium hydroxide is used to adjust the pH of the primary iron and aluminum removal solution to 4.2–4.5 for a secondary iron and aluminum removal process, yielding secondary iron and aluminum slag and a secondary iron and aluminum removal solution. Nickel and cobalt are precipitated from the secondary iron and aluminum removal solution, resulting in a lean solution and nickel and cobalt precipitate. Manganese and magnesium are then precipitated from the lean solution in stages, yielding manganese slag and magnesium slag. Finally, the secondary iron and aluminum slag is returned to the pressurized acid leaching process. Typically, a circulating leaching slurry neutralization unit is used to neutralize excess acid in the leaching solution, and a multi-stage iron, aluminum, and chromium removal unit is used to remove impurities from the liquid phase of the leaching solution. The secondary and multi-stage slag phases generated in the multi-stage iron, aluminum, and chromium removal unit are returned to the circulating leaching slurry neutralization unit for further acid leaching treatment. However, the slag produced in the iron, aluminum and chromium removal process may have large particles, which is not conducive to subsequent reaction with acidic slurry and affects the efficiency of slag recovery. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a slag phase treatment system for iron, aluminum and chromium removal from laterite nickel ore leaching solution, thereby solving the technical problem of low recovery efficiency of slag phase generated in the iron, aluminum and chromium removal process in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a slag phase treatment system for iron, aluminum, and chromium removal from laterite nickel ore leaching solution, comprising a filtration module, a refining module, a feeding module, and a measurement module. The filtration module includes a suction component and a filtration component. The suction component is installed in the slag phase sedimentation zone within the multi-stage iron, aluminum, and chromium removal unit, and its suction port is connected to the slag phase sedimentation zone. It is used to extract the slag phase generated within the multi-stage iron, aluminum, and chromium removal unit. The filtration component is connected to the discharge port of the suction component and is used to filter the slag phase. The filtration component has a slag outlet and a filtrate outlet connected to the multi-stage iron, aluminum, and chromium removal unit. The refining module is connected to the slag outlet and is used to pulverize the slag.

[0006] The suction assembly can extract the slag phase generated in the multi-stage iron, aluminum and chromium removal unit and guide it into the filter assembly. After solid-liquid separation by the filter assembly, the extracted filtrate can be returned to the multi-stage iron, aluminum and chromium removal unit, while the filter residue is discharged to the refining module and crushed by the refining module.

[0007] The feeding module includes a feed pipe and a feed guide drive. The feed pipe has a feed end connected to the discharge port of the refining module and a discharge end for communicating with the circulating leaching slurry neutralization unit. The feed guide drive is built into the feed pipe and is used to guide the slag phase into the circulating leaching slurry neutralization unit. The measuring module is connected to the feed guide drive and the circulating leaching slurry neutralization unit to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit and to control the feed guide drive to stop feeding when the detected pH value reaches the set value.

[0008] After being crushed by the refining module, the filter residue is fed into the feed pipe. Driven by the feed guide, the residue phase is sequentially discharged into the circulating leaching slurry neutralization unit. When the measuring module detects that the pH value of the slurry in the circulating leaching slurry neutralization unit has reached the set value, the measuring module can trigger a signal to control the feed guide to stop feeding, thereby controlling the amount of residue phase fed in.

[0009] In some embodiments, the suction assembly includes a suction pipe and a suction pump. The suction pipe is located in the slag phase sedimentation zone within the multi-segment iron, aluminum and chromium removal unit, and a plurality of suction ports are uniformly arranged along its length on its lower side. The inlet of the suction pump is connected to the suction pipe through a first connecting pipe, and its outlet is connected to the filter assembly through a second connecting pipe.

[0010] In some embodiments, the filtration assembly includes an outer cylinder, an inner cylinder, a collection tank, a first spiral conveyor rod, and a first motor. The outer cylinder is inclined. The inner cylinder is built into the outer cylinder and coaxially arranged with the outer cylinder. The inner cylinder has a plurality of filter holes evenly distributed on its wall for filtering liquid. The lower end of the inner cylinder is connected to the discharge port of the suction assembly, and its higher end is connected to the refining module. The collection tank is fitted onto the lower end of the outer cylinder, and the bottom side of the outer cylinder has an opening communicating with the collection tank. The first spiral conveyor rod is built into the inner cylinder and extends from the bottom end of the inner cylinder to its top end. The drive shaft of the first motor is connected to the first spiral conveyor rod to drive the first spiral conveyor rod to rotate and transport the filter residue to the refining module. This structure can achieve thorough filtration of the liquid entrained in the filter residue.

[0011] In some embodiments, the refinement module includes a vessel body, a crushing component and an abrasive component arranged sequentially below the feed inlet of the vessel body. The crushing component is used to crush the filter residue entering through the feed inlet, and the abrasive component is used to grind the crushed filter residue. The crushing component includes two crushing rollers and a driving member. The two crushing rollers are arranged side by side and meshed with each other for rotational connection. A crushing zone corresponding to the feed inlet of the vessel body and used for crushing the filter residue is formed between the two crushing rollers. The driving member is connected to both crushing rollers and drives the two crushing rollers to rotate relative to each other. The outer wall of the vessel body is recessed inward to form an inner... The inner cylindrical body is located between the crushing component and the abrasive component. Its upper end is connected to the inner wall of the vessel to form a shrinking channel with a cross-sectional area decreasing from top to bottom, and its lower end is connected to the inner wall of the vessel to form an expanding channel with a cross-sectional area increasing from top to bottom. The abrasive component includes a grinding roller and a third motor. The grinding roller is built into the expanding channel. The outer circumferential surface of the grinding roller is spaced apart from the inner wall of the vessel to form a grinding zone between them. The drive shaft of the third motor is connected to the grinding roller to drive the grinding roller to rotate and grind the filter residue passing through the grinding zone.

[0012] In some embodiments, the material guiding drive includes a second spiral conveyor and a second motor. The second spiral conveyor is horizontally disposed inside the material pipe. The drive shaft of the second motor is connected to the central shaft of the second spiral conveyor to drive the second spiral conveyor to rotate so as to output the filter residue in the material pipe through its outlet end. The outlet end of the material pipe is provided with a feed cylinder. One side of the feed cylinder is connected to the material pipe, and its bottom end is connected to the circulating leaching slurry neutralization unit. A valve is provided inside the feed cylinder. The valve is connected to a measuring module. When the measuring module detects that the pH value has reached the set value, the valve closes.

[0013] In some embodiments, the measurement module includes a pH meter and a processor. The pH meter is located in the circulating leaching slurry neutralization unit to detect the pH value of the slurry in the circulating leaching slurry neutralization unit. The processor is electrically connected to the feed drive and the pH meter. When the pH value detected by the pH meter is less than the set value of the processor, the feed drive operates normally. When the pH value detected by the pH meter reaches the set value of the processor, the processor controls the feed drive to stop operating.

[0014] Compared with the prior art, the beneficial effects of the present invention include: by setting up a filtration module and a refining module, the slag phase generated in the multi-stage iron, aluminum and chromium removal unit can be treated. The material suction component is set in the slag phase sedimentation zone of the multi-stage iron, aluminum and chromium removal unit, which can timely extract the sediment generated in the multi-stage iron, aluminum and chromium removal unit to the filtration component for filtration during the slurry treatment process. After solid-liquid separation by the filtration component, the filtrate is sent back to the multi-stage iron, aluminum and chromium removal unit for reaction, and the filter residue is discharged to the refining module. The refining module crushes the large particles in the filter residue, making the particle size of various substances in the filter residue uniform and refined. In the subsequent reuse of the slag phase, it is beneficial for the slag phase to fully react with the acidic slurry, thereby improving the efficiency of slag phase recycling.

[0015] By setting up a feeding module and a measurement module, the pH value of the slurry in the circulating leaching slurry neutralization unit is obtained through the measurement module. When the detected pH value reaches the set value, the feeding drive is controlled to stop feeding the circulating leaching slurry neutralization unit. The amount of slurry is controlled by the returned filter residue, which further improves the subsequent acid leaching and dissolution efficiency of the residue phase. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum and chromium removal provided by the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the filter components of the slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution.

[0018] Figure 3 yes Figure 1 A schematic diagram of the material suction component of the slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution.

[0019] Figure 4 yes Figure 1 A schematic diagram of the detailed module of the slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution.

[0020] Figure 5 yes Figure 1 A schematic diagram of the feeding module of the slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution.

[0021] In the picture:

[0022] 1. Filter module; 11. Suction assembly; 111. Suction pipe; 112. Suction pump; 113. First connecting pipe; 114. Second connecting pipe; 12. Filter assembly; 121. Outer cylinder; 122. Inner cylinder; 123. Liquid collection tank; 124. First screw conveyor rod; 125. First motor; 126. Third connecting pipe;

[0023] 2. Refinement module; 21. Kettle body; 22. Crushing assembly; 221. Crushing roller; 23. Abrasive assembly; 231. Grinding roller; 232. Third motor;

[0024] 3. Feeding module; 31. Material pipe; 32. Material guide drive component; 321. Second screw conveyor; 322. Second motor; 33. Material conveyor cylinder; 34. Valve;

[0025] 4. Measurement module;

[0026] 5. Feed valve;

[0027] 6. Neutralization and impurity removal module; 61. Circulating leaching slurry neutralization unit; 62. Multi-stage countercurrent washing unit; 63. Multi-stage iron, aluminum and chromium removal unit. Detailed Implementation

[0028] 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.

[0029] Before describing the embodiments, this invention will first explain some terms used in the text;

[0030] In the description of this application, "electrical connection" mainly refers to a connection method capable of exchanging data, which includes physical connections via cables as well as wireless connections. The specific connection methods are all prior art that can be understood and conceived by those skilled in the art, and will not be elaborated upon herein.

[0031] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] like Figures 1 to 5 As shown, the present invention provides a slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum and chromium removal, including a filtration module 1, a refining module 2, a feeding module 3 and a measurement module 4.

[0034] The filtration module 1 includes a suction component 11 and a filtration component 12. The suction component 11 is set in the slag phase sedimentation zone within the multi-stage iron and aluminum-chromium removal unit 63, and its suction port is connected to the slag phase sedimentation zone. It is used to extract the slag phase generated within the multi-stage iron and aluminum-chromium removal unit 63. The filtration component 12 is connected to the discharge port of the suction component 11 and is used to filter the slag phase. The filtration component 12 has a slag outlet and a filtrate outlet connected to the multi-stage iron and aluminum-chromium removal unit 63.

[0035] The refining module 2 is connected to the filter residue outlet and is used to crush the filter residue.

[0036] The feeding module 3 includes a feed pipe 31 and a feed guide drive 32. The feed pipe 31 has a feed end connected to the discharge port of the refining module 2 and a discharge end for communicating with the circulating leaching slurry neutralization unit 61. The feed guide drive 32 is built into the feed pipe 31 and is used to guide the slag phase into the circulating leaching slurry neutralization unit 61.

[0037] The measurement module 4 is connected to the feed drive 32 and the circulating leaching slurry neutralization unit 61. It is used to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit 61 and control the feed drive 32 to stop feeding when the detected pH value reaches the set value.

[0038] In this device, after the slag phase generated in the multi-stage iron, aluminum and chromium removal unit 63 is sucked out by the suction component 11, the slag phase can be introduced into the filter component 12. After solid-liquid separation by the filter component 12, the sucked-out filtrate can be returned to the multi-stage iron, aluminum and chromium removal unit 63, while the filter residue is discharged to the refining module 2. After being crushed by the refining module 2, it is introduced into the feed pipe 31. Driven by the feed guide drive 32, the slag phase is sequentially exported to the circulating leaching slurry neutralization unit 61. When the measuring module 4 detects that the pH value of the slurry in the circulating leaching slurry neutralization unit 61 has reached the set value, the measuring module 4 can trigger a signal to control the feed guide drive 32 to stop feeding. The amount of slag phase input can be adjusted according to the pH value of the slurry in the circulating leaching slurry neutralization unit 61.

[0039] It should be noted that the iron, aluminum, and chromium removal section of the laterite nickel ore leaching solution specifically includes a neutralization and impurity removal module 6. The neutralization and impurity removal module 6 includes a circulating leaching slurry neutralization unit 61, a multi-stage countercurrent washing unit 62, and a multi-stage iron, aluminum, and chromium removal unit 63. The circulating leaching slurry neutralization unit 61 is used to neutralize excess acid in the leaching solution. The multi-stage countercurrent washing unit 62 is connected to the circulating leaching slurry neutralization unit 61 and is used to wash the neutralized leaching solution. The multi-stage iron, aluminum, and chromium removal unit 63 is connected to the multi-stage countercurrent washing unit 62 and is used to remove impurities from the liquid phase of the leaching solution after washing by the multi-stage countercurrent washing unit 62. The slag removal method is to add a neutralizing agent to it and gradually increase the pH value.

[0040] The multi-stage iron, aluminum, and chromium removal unit 63 comprises multiple sequentially connected sub-units for iron, aluminum, and chromium removal. The pH value for impurity removal gradually increases in each sub-unit, with the first sub-unit having the lowest pH value. Experimental testing shows that the slag produced by the first sub-unit mainly contains iron, aluminum, and chromium, with very low levels of nickel, cobalt, and manganese. Therefore, the slag produced by the first sub-unit can be discarded as tailings. The slag produced by the other sub-units contains iron, aluminum, nickel, and cobalt, with significant amounts of nickel, chromium, and manganese. This slag can be introduced into the circulating leaching slurry neutralization unit 61 for acid leaching and dissolution.

[0041] Therefore, this device is mainly for treating the slag phase generated after the first iron removal aluminum-chromium sub-unit, that is, the subsequent multiple iron removal aluminum-chromium sub-units. Correspondingly, according to the multiple iron removal aluminum-chromium sub-unit 63, which includes multiple iron removal aluminum-chromium sub-units connected in sequence, multiple suction components 11 are provided, which are respectively set in the iron removal aluminum-chromium sub-units after the first one.

[0042] In some embodiments, such as Figure 3 As shown, the suction assembly 11 includes a suction pipe 111 and a suction pump 112. The suction pipe 111 is located in the slag sedimentation zone within the multi-stage iron and aluminum-chromium removal unit 63, that is, it is located in the equipment of the multi-stage iron and aluminum-chromium removal sub-unit after the first stage. The suction pipe 111 is located at the bottom of the equipment, and multiple suction ports that communicate with the inside of the equipment are evenly arranged along its length on its lower side. The inlet of the suction pump 112 is connected to the suction pipe 111 through the first connecting pipe 113, and its outlet is connected to the inside of the inner cylinder 122 of the filter assembly 12 through the second connecting pipe 114. When in use, the suction pump 112 is turned on, and the slag sediment at the bottom of the multi-stage iron and aluminum-chromium removal sub-unit can be sucked out through the first connecting pipe 113 and the suction port of the suction pipe 111, and sent into the filter assembly 12 through the second connecting pipe 114.

[0043] In some embodiments, such as Figure 2As shown, one or more filter components 12 are provided. When one filter component 12 is provided, it is connected to the discharge ports of multiple suction components 11. When multiple filter components 12 are provided, each filter component 12 is connected to a corresponding suction component 11, enabling comprehensive or classified treatment of slag phases generated in multiple stages. The filter component 12 includes an outer cylinder 121, an inner cylinder 122, a liquid collection tank 123, a first spiral conveyor rod 124, and a first motor 125. The outer cylinder 121 is inclined. The inner cylinder 122 is built into the outer cylinder 121 and is coaxially arranged with the outer cylinder 121. The inner cylinder 122 has a plurality of filter holes evenly opened on its wall for filtering liquid, so that the liquid substances contained in the inner cylinder 122 can be filtered through the filter holes to the interlayer between the inner cylinder 122 and the outer cylinder 121. Furthermore, the inner cylinder 122 is inclined. The lower end is connected to the discharge port of the suction assembly 11, that is, connected to one end of the second connecting pipe 114. The material residue extracted by the suction assembly 11 will be sent to the bottom end of the inner cylinder 122. The higher end of the inner cylinder 122 is connected to the refining module 2. The liquid collection tank 123 is sleeved on the lower end of the outer cylinder 121. After the material residue is filtered through the filter hole and flows to the interlayer between the inner cylinder 122 and the outer cylinder 121, it flows into the liquid collection tank 123 through a passage opened on the bottom side of the outer cylinder 121 that communicates with the liquid collection tank 123. The first spiral conveying rod 124 is built into the inner cylinder 122 and rotatably connected to the inner cylinder 122. The drive shaft of the first motor 125 is connected to the first spiral conveying rod so that the first motor 125 can drive the bolt rod conveying rod to rotate inside the inner cylinder 122. The first spiral conveying rod 124 extends from the bottom end to the top end of the inner cylinder 122. During its rotation, it can convey the material box at the bottom end of the inner cylinder 122 to the top end of the inner cylinder 122 so as to convey the filter residue to the refining module 2. At the same time, it can also disperse the filter residue during the conveying process so as to fully filter the liquid mixed in the filter residue.

[0044] Furthermore, the bottom of the collection tank 123 is connected to a third connecting pipe 126, which is connected to a water pump and then to the multi-stage iron and aluminum chromium removal unit 63. The water pump can send the filtrate collected in the collection tank 123 back to the multi-stage iron and aluminum chromium removal unit 63 for further impurity removal.

[0045] Furthermore, such as Figure 1 As shown, in some embodiments, a feed valve 5 is provided between the filter residue outlet of the filter assembly 12 and the refining module 2. By closing the feed valve 5, the feeding of material to the refining module 2 can be stopped in time, so as to avoid excessive material supply in the refining module 2 and blockage.

[0046] like Figure 1 , Figure 4As shown, in some embodiments, in order to ensure the fineness of the slag, the refining module 2 includes a vessel body 21, a crushing component 22 and an abrasive component 23 arranged sequentially below the feed inlet of the vessel body 21. The crushing component 22 is used to crush the filter residue entering through the feed inlet, and the abrasive component 23 is used to grind the crushed filter residue. By performing the crushing and grinding processes, a finer slag can be obtained.

[0047] Furthermore, the crushing assembly 22 includes two crushing rollers 221 and a driving component. The two crushing rollers 221 are arranged side by side and meshed with each other for rotational connection. Both ends of the crushing rollers 221 are rotatably connected to the vessel body 21. A crushing zone corresponding to the feed inlet of the vessel body 21 is formed between the two crushing rollers 221 and used for crushing filter residue. The driving component is preferably two motors, which are respectively connected to the two crushing rollers 221 and can drive the two crushing rollers 221 to rotate relative to each other, so that the material can be crushed by the two crushing rollers 221 after entering the crushing zone between the two crushing rollers 221.

[0048] Furthermore, the outer wall of the vessel 21 is recessed inward to form an inner concave cylinder, which is located between the crushing component 22 and the abrasive component 23. The upper end of the inner concave cylinder is connected to the inner wall of the vessel 21 to form a contraction channel with a cross-sectional area decreasing from top to bottom, which can concentrate the material crushed by the crushing component 22 to the inner concave cylinder. The lower end of the inner concave cylinder is connected to the inner wall of the vessel 21 to form an expansion channel with a cross-sectional area increasing from top to bottom. The abrasive component 23 includes a grinding roller 231 and a third motor. 232, the grinding roller 231 is built into the expansion channel, and the outer circumferential surface of the grinding roller 231 is spaced apart from the inner wall of the vessel body 21 so that a grinding zone is formed between them. After the material enters the inner concave cylinder, it will be discharged to the grinding zone. The width of the grinding zone decreases from top to bottom. The drive shaft of the third motor 232 is eccentrically connected to the grinding roller 231 so that when the third motor 232 drives the grinding roller 231 to rotate, the grinding roller 231 can intermittently contact and squeeze the material with the inner wall of the vessel body 21 to achieve grinding of the slag.

[0049] like Figure 1 , Figure 5 As shown, in some embodiments, the outlet of the feed pipe 31 can be directly connected to the circulating leaching slurry neutralization unit 61, and the inlet of the feed pipe 31 is located at the end opposite to the outlet. The material guiding drive component 32 includes a second spiral conveying rod 321 and a second motor 322. The second spiral conveying rod 321 is horizontally arranged inside the feed pipe 31. The drive shaft of the second motor 322 is fixedly connected to the central shaft of the second spiral conveying rod 321, so that when the second motor 322 drives the second spiral conveying rod 321 to rotate, the material entering at the inlet of the feed pipe 31 can be conveyed to its outlet, thereby realizing the export of filter residue to the circulating leaching slurry neutralization unit 61.

[0050] Furthermore, when the measuring module 4 drives the material guiding drive 32 to stop, the speed of the second motor 322 will gradually slow down until it stops. Therefore, during the process of the second motor 322 being shut down, the screw conveyor will still rotate slowly to discharge the material. In order to avoid the material guiding drive 32 from excessively conveying filter residue to the circulating leaching slurry neutralization unit 61, in some embodiments, the discharge end of the material pipe 31 is provided with a feed cylinder 33. One side of the feed cylinder 33 is connected to the material pipe 31, and its bottom end is connected to the circulating leaching slurry neutralization unit 61. A valve 34 is provided in the feed cylinder 33 so that the material will be introduced into the feed cylinder 33 during the process of the material guiding drive 32 stopping. The valve 34 is connected to the measuring module 4. When the measuring module 4 detects that the pH value reaches the set value, the valve 34 closes and the material is trapped in the feed cylinder 33.

[0051] In some embodiments, the measuring module 4 includes a pH meter and a processor. The pH meter is located in the circulating leaching slurry neutralization unit 61 to detect the pH value of the slurry in the circulating leaching slurry neutralization unit 61. The processor is electrically connected to the second motor 322 of the feed drive 32 and the pH meter. When the pH value detected by the pH meter is less than the set value of the processor, the second motor 322 operates normally and drives the second screw conveyor 321 to rotate for feeding. When the pH value detected by the pH meter reaches the set value of the processor, the processor controls the second motor 322 to stop running.

[0052] Working principle: After slag is generated in the multi-stage iron and aluminum-chromium removal unit 63, the suction pump 112 is turned on to draw the slag generated in the multi-stage iron and aluminum-chromium removal unit 63 out of the inner cylinder 122 through the first connecting pipe 113 and the second connecting pipe 114. The first motor 125 drives the first screw conveyor 124 to rotate and transport the filter residue to the vessel body 21. During the transport, the filtrate is filtered in the inner cylinder 122 to the interlayer between the inner cylinder 122 and the outer cylinder 121, and flows along the outer cylinder 121 to the collection tank 123. The filtrate in the collection tank 123 is sent back to the multi-stage iron and aluminum-chromium removal unit 63 through the water pump and the third connecting pipe 126. After the filter residue of the iron-aluminum-chromium unit 63 is fed into the kettle body 21, it is crushed in the crushing zone between two crushing rollers 221, and then ground and refined again in the grinding zone before being introduced into the feed pipe 31. The second screw conveyor 321 is driven by the second motor 322 to rotate and sequentially export the slag phase to the circulating leaching slurry neutralization unit 61. When the pH value detector detects that the pH value of the slurry in the circulating leaching slurry neutralization unit 61 reaches the set value of the processor, the processor can trigger a signal to control the second motor 322 to stop, thus stopping the supply of material to the circulating leaching slurry neutralization unit 61.

[0053] This invention utilizes a filtration module 1 and a refining module 2 to treat the slag phase generated within the multi-stage iron, aluminum, and chromium removal unit 63. The suction assembly 11 is positioned within the slag phase sedimentation zone of the multi-stage iron, aluminum, and chromium removal unit 63. During slurry treatment, the sediment generated within the multi-stage iron, aluminum, and chromium removal unit 63 is promptly extracted to the filtration assembly 12 for filtration. After solid-liquid separation by the filtration assembly 12, the filtrate is returned to the multi-stage iron, aluminum, and chromium removal unit 63 for reaction. The filter residue is discharged to the refining module 2, where large particles in the filter residue are crushed, resulting in uniformly fined particles. This facilitates a more thorough reaction between the slag phase and the acidic slurry during subsequent reuse, improving the efficiency of slag phase recovery.

[0054] The present invention uses a feeding module 3 and a measuring module 4 to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit 61. When the detected pH value reaches the set value, the feeding drive component 32 is controlled to stop feeding the circulating leaching slurry neutralization unit 61. The amount of slurry is controlled by the returned filter residue, which further improves the subsequent acid leaching and dissolution efficiency of the residue phase.

[0055] 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 slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal, characterized in that, include: The filtration module includes a suction component and a filtration component. The suction component is installed in the slag sedimentation zone within the multi-stage iron and aluminum-chromium removal unit, and its suction port is connected to the slag sedimentation zone. It is used to extract the slag generated within the multi-stage iron and aluminum-chromium removal unit. The filtration component is connected to the discharge port of the suction component and is used to filter the slag. The filtration component has a slag outlet and a filtrate outlet connected to the multi-stage iron and aluminum-chromium removal unit. A refining module, connected to the filter residue outlet, is used to pulverize the filter residue; as well as The feeding module includes a feed pipe and a feed guide drive. The feed pipe has a feed end connected to the discharge port of the refining module and a discharge end for communicating with the circulating leaching slurry neutralization unit. The feed guide drive is built into the feed pipe and is used to export the slag phase into the circulating leaching slurry neutralization unit. The slag phase treatment system after removing iron, aluminum, and chromium from the laterite nickel ore leaching solution also includes a measurement module. The measurement module is connected to the material guide drive and the circulating leaching slurry neutralization unit. It is used to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit and control the material guide drive to stop feeding when the detected pH value reaches the set value.

2. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 1, characterized in that, The suction assembly includes: The suction pipe is located within the slag sedimentation zone of the multi-segment iron, aluminum, and chromium removal unit, and has multiple suction ports evenly arranged along its length on its lower side; and The suction pump has its inlet connected to the suction pipe via a first connecting pipe, and its outlet connected to the filter assembly via a second connecting pipe.

3. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 1 or 2, characterized in that, The filtering component includes: The outer cylinder is inclined. The inner cylinder is built into the outer cylinder and is coaxially arranged with the outer cylinder. The inner cylinder has a plurality of filter holes evenly opened on its wall for filtering liquid. The lower end of the inner cylinder is connected to the discharge port of the suction assembly, and its higher end is connected to the refining module. A liquid collection tank is fitted onto the lower end of the outer cylinder, and an opening communicating with the liquid collection tank is provided on the bottom side of the outer cylinder. A first helical conveyor rod, the first helical conveyor rod being built into the inner cylinder and extending from the bottom end of the inner cylinder to its top end; and A first motor, the drive shaft of which is connected to the first spiral conveyor rod, is used to drive the first spiral conveyor rod to rotate in order to convey the filter residue to the refining module.

4. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 1, characterized in that, The refining module includes a vessel body, a crushing component and an abrasive component arranged sequentially below the feed inlet of the vessel body. The crushing component is used to crush the filter residue entering through the feed inlet, and the abrasive component is used to grind the crushed filter residue.

5. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 4, characterized in that, The material crushing assembly includes: Two crushing rollers are arranged side by side and meshed with each other for rotational connection. A crushing zone is formed between the two crushing rollers, which corresponds to the feed inlet of the vessel body and is used to crush the filter residue. A driving component is connected to both of the crushing rollers to drive the two crushing rollers to rotate relative to each other.

6. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 4, characterized in that, The outer wall of the vessel body is recessed inward to form an inner concave cylinder. The inner concave cylinder is located between the crushing component and the abrasive component. Its upper end is connected to the inner wall of the vessel body to form a shrinking channel with a cross-sectional area decreasing from top to bottom. Its lower end is connected to the inner wall of the vessel body to form an expanding channel with a cross-sectional area increasing from top to bottom. The abrasive assembly includes a grinding roller and a third motor. The grinding roller is built into the expansion channel. The outer circumferential surface of the grinding roller is spaced apart from the inner wall of the vessel to form a grinding zone between them. The drive shaft of the third motor is connected to the grinding roller to drive the grinding roller to rotate and grind the filter residue passing through the grinding zone.

7. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 1, characterized in that, The material guiding drive component includes: The second spiral conveyor rod is horizontally disposed inside the material pipe; and The second motor has its drive shaft connected to the central shaft of the second screw conveyor, which drives the second screw conveyor to rotate so that the filter residue in the conveying pipe is output through its outlet end.

8. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 7, characterized in that, The discharge end of the feed pipe is provided with a feed tube. One side of the feed tube is connected to the feed pipe, and its bottom end is connected to the circulating leaching slurry neutralization unit. A valve is provided inside the feed tube.

9. The slag phase treatment system for laterite nickel ore leaching solution after iron, aluminum, and chromium removal according to claim 1, characterized in that, The measurement module includes: A pH meter, located in the circulating leaching slurry neutralization unit, is used to detect the pH value of the slurry within the unit; and The processor is electrically connected to the material guiding drive and the pH value detector. When the pH value detected by the pH value detector is less than the set value of the processor, the material guiding drive operates normally; when the pH value detected by the pH value detector reaches the set value of the processor, the processor controls the material guiding drive to stop operating.

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