Low-quality nickel ore circulating leaching system

Abstract

The utility model belongs to the technical field of laterite nickel ore atmospheric pressure leaching, and discloses a low-quality nickel ore circulation leaching system which comprises a dump leaching module and a stirring leaching module. The heap leaching module comprises a plurality of normal-pressure heap leaching pools, a plurality of acid liquor pools and a plurality of acid liquor circulating structures, heap leaching mineral aggregates are arranged in the plurality of normal-pressure heap leaching pools, and the plurality of acid liquor pools are communicated with the plurality of normal-pressure heap leaching pools in a one-to-one correspondence manner, so that acid liquor in the normal-pressure heap leaching pools can flow back into the corresponding acid liquor pools; the acid liquor circulating structure is used for connecting the plurality of normal-pressure dump leaching pools and the plurality of acid liquor pools, and the acid liquor circulating structure can be used for detecting the nickel content in the acid liquor in the plurality of acid liquor pools and guiding the acid liquor in the acid liquor pools into the corresponding plurality of normal-pressure dump leaching pools according to a detection result. According to the heap leaching module, circulating drip irrigation of the acid liquor is achieved, circulating leaching of the nickel ore is achieved, nickel in the acid liquor is gradually enriched, on the premise that the usage amount of the acid liquor is not increased, leaching of the nickel is effectively achieved, and the treatment cost of the low-quality nickel ore is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to laterite nickel ore atmospheric leaching technical field especially relates to a kind of low-quality nickel ore cyclic leaching system. BACKGROUND

[0002] With the vigorous development of new energy vehicle industry in our country and the gradual exhaustion of high-quality nickel ore and cobalt resources in our country, the demand of industry for Ni, Co and Mn metals in new energy ternary materials is increasing, and the development of laterite nickel ore with large reserves but low nickel grade gradually becomes the focus of industry. In the current wet smelting method of laterite nickel ore, the ore is usually sent into a high-pressure reaction kettle and mixed with sulfuric acid and steam for high-pressure leaching to extract nickel and cobalt from the laterite nickel ore.

[0003] However, the above processing method is generally for high-quality or conventional quality nickel ore, and low-quality nickel ore generally refers to ore with less than 1.2 nickel content. Using the above conventional high-temperature and high-pressure kettle acid leaching consumes a large amount of acid and high-temperature steam, and the cost is too high.

[0004] Therefore, it is necessary to provide a heap leaching module, a stirring leaching module and a low-quality nickel ore cyclic leaching system to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of low-quality nickel ore cyclic leaching system, realize the cyclic drip irrigation of acid liquor, realize the cyclic leaching of nickel ore, make the nickel in acid liquor gradually enrich, effectively realize the leaching of nickel under the premise of not increasing the use amount of acid liquor, reduce the processing cost of low-quality nickel ore.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A heap leaching module is used for atmospheric cyclic heap leaching of heap leaching ore, and the heap leaching module comprises:

[0008] A plurality of atmospheric heap leaching pools are provided with the heap leaching ore;

[0009] A plurality of acid liquor pools are in one-to-one correspondence with a plurality of atmospheric heap leaching pools, so that the acid liquor in the atmospheric heap leaching pool can flow back into the corresponding acid liquor pool;

[0010] An acid liquor circulation structure is used to connect a plurality of atmospheric heap leaching pools and a plurality of acid liquor pools, and the acid liquor circulation structure can detect the nickel content in the acid liquor in a plurality of acid liquor pools, and according to the detection result, the acid liquor in a plurality of acid liquor pools is guided into corresponding a plurality of atmospheric heap leaching pools.

[0011] As a preferred, the acid liquor circulation structure comprises:

[0012] A circulating pump is used to divert acid from the acid pools to the corresponding atmospheric pressure heap leaching pools.

[0013] The inlet pipe has one end connected to the inlet of the circulating pump and the other end forming a plurality of inlet branch pipes, which are connected to a plurality of acid pools respectively. The inlet branch pipes are equipped with electromagnetic inlet valves.

[0014] The outlet pipe has one end connected to the outlet of the circulating pump, and the other end forms a plurality of outlet branch pipes. The plurality of outlet branch pipes are connected to a plurality of atmospheric pressure heap leaching tanks. The outlet branch pipes are equipped with electromagnetic outlet valves.

[0015] Several testing devices are used to detect the nickel content in the acid in the corresponding acid pools.

[0016] The control module is electrically connected to the electromagnetic inlet valve, the electromagnetic outlet valve, the circulating pump, and the detection device.

[0017] Preferably, the outlet branch pipe is provided with several drip holes, through which the acid in the acid pool drips drop by drop into the atmospheric pressure heap leaching tank.

[0018] Preferably, the bottom wall of the atmospheric pressure heap leaching tank is inclined along the Z-axis direction, and a drain outlet is provided at the bottom of the side wall of the atmospheric pressure heap leaching tank located on the lower side of the bottom wall of the atmospheric pressure heap leaching tank. The atmospheric pressure heap leaching tank and the acid tank are connected through the drain outlet.

[0019] A stirring leaching module is used for atmospheric pressure stirring leaching of ore, the stirring leaching module comprising:

[0020] Several atmospheric pressure stirred leaching tanks are connected in sequence along the X-axis direction, and adjacent atmospheric pressure stirred leaching tanks are all connected. The stirred leaching material is provided in each of the several atmospheric pressure stirred leaching tanks.

[0021] A plurality of agitating devices are provided, one-to-one, in a plurality of atmospheric pressure leaching tanks, and the agitating devices are used to agitate the leaching material in the atmospheric pressure leaching tanks;

[0022] An acid-adding device is connected to the atmospheric pressure stirred immersion tank located at the first end along the X-axis. The acid-adding device is used to add acid to the atmospheric pressure stirred immersion tank located at the first end, and the acid can overflow unidirectionally into the next atmospheric pressure stirred immersion tank.

[0023] Preferably, the atmospheric pressure stirred leaching tank includes:

[0024] The pool body has a notch formed on one side wall and is fixed flush with the next atmospheric pressure stirred leaching pool.

[0025] A baffle is fixed to the inner wall of the pool body and parallel to the side wall with the notch. The baffle has a gap with the bottom wall of the pool body. A filter screen is fixed between the baffle and the bottom wall of the pool body. The diameter of the filter screen is smaller than the diameter of the stirred leaching material.

[0026] Along the X-axis, the baffle and the filter screen divide the pool into a first part and a second part. The stirred leaching material is placed in the first part, and the acid adding device adds acid to the first part.

[0027] Preferably, the agitation device includes:

[0028] An agitator and a drive unit are provided, wherein the agitator is disposed in the atmospheric pressure stirred immersion tank, and the drive unit is used to drive the agitator to rotate.

[0029] A low-quality nickel ore circulating leaching system includes:

[0030] The washing module is used to wash and screen the raw ore to screen out the first target ore with particles no larger than the target particle size and the stirred leaching ore with particles larger than the target particle size.

[0031] A gravity separation module is connected to the washing module, and the gravity separation module is used to gravity separate the first target ore to form heap leaching ore.

[0032] The heap leaching module described above is connected to the gravity separation module, and the heap leaching module is used to perform atmospheric pressure circulating heap leaching on the heap leaching ore.

[0033] The above-mentioned stirring and leaching module is connected to the ore washing module, and the stirring and leaching module is used to perform atmospheric pressure stirring and leaching of the stirring and leaching ore.

[0034] Preferably, the ore washing module includes:

[0035] A cylindrical ore washing machine has a raw ore inlet, a first ore outlet, and a second ore outlet. The first ore outlet is used to discharge first ore with a particle size greater than a first particle size. The first ore outlet is connected to the stirring and leaching module. The second ore outlet is used to discharge second ore with a particle size not greater than the first particle size.

[0036] A trough-type ore washing machine has a washing inlet, a first washing outlet, and a second washing outlet. The washing inlet is connected to the second ore outlet. The first washing outlet is used to discharge a third ore with a particle size greater than the target particle size. The first washing outlet is connected to the agitated leaching module. The agitated leaching ore includes the first ore and the third ore. The second washing outlet is used to discharge a first target ore with a particle size not greater than the target particle size. The second washing outlet is connected to the gravity separation module.

[0037] Preferably, the reselection module includes:

[0038] A hydrocyclone has a cyclone inlet, a first cyclone outlet, and a second cyclone outlet. The cyclone inlet is connected to the second washing outlet. The first cyclone outlet is used to discharge a fourth ore material with a particle size greater than a second particle size. The second cyclone outlet is used to discharge a fifth ore material with a particle size not greater than the second particle size. The second cyclone outlet is connected to the heap leaching module.

[0039] The spiral chute has a gravity separation inlet, a first gravity separation outlet, and a second gravity separation outlet. The gravity separation inlet is connected to the first cyclone outlet. The first gravity separation outlet is used to discharge a sixth ore material whose weight is greater than the target weight. The second gravity separation outlet is used to discharge a seventh ore material whose weight is not greater than the target weight. The second gravity separation outlet is connected to the heap leaching module. The heap leaching ore material includes the fifth ore material and the seventh ore material.

[0040] The beneficial effects of this utility model are:

[0041] The heap leaching module is used for atmospheric pressure circulating heap leaching of heap leaching materials. The heap leaching module includes several atmospheric pressure heap leaching tanks, several acid tanks, and an acid circulation structure. Each of the several atmospheric pressure heap leaching tanks contains heap leaching materials. The several acid tanks are connected to the several atmospheric pressure heap leaching tanks one by one, so that the acid in the atmospheric pressure heap leaching tanks can flow back to the corresponding acid tanks. The acid circulation structure is used to connect the several atmospheric pressure heap leaching tanks and the several acid tanks. The acid circulation structure can detect the nickel content in the acid in the several acid tanks and guide the acid in the acid tanks to the corresponding several atmospheric pressure heap leaching tanks according to the detection results.

[0042] During heap leaching, the acid solution in several acid pools is first diverted to corresponding atmospheric pressure heap leaching pools through an acid circulation structure. Since the atmospheric pressure heap leaching pools are connected to the acid pools one by one, the acid solution can flow back from the atmospheric pressure heap leaching pools to the corresponding acid pools after reacting with the heap leaching ore. The acid circulation structure detects the nickel content in the acid solution in several acid pools, and based on the detection results, the acid solution in a certain acid pool is dripped back into a certain atmospheric pressure heap leaching pool, thereby realizing the circulating drip irrigation of acid solution and achieving circulating leaching of nickel ore. This allows nickel to gradually accumulate in the acid solution, effectively achieving nickel leaching without increasing the amount of acid used, and reducing the processing cost of low-quality nickel ore.

[0043] The stirred leaching module is used for atmospheric pressure stirred leaching of ore. The stirred leaching module includes several atmospheric pressure stirred leaching tanks, several agitation devices, and an acid addition device. The several atmospheric pressure stirred leaching tanks are connected in sequence along the X-axis, and adjacent atmospheric pressure stirred leaching tanks are unidirectionally connected. Each of the atmospheric pressure stirred leaching tanks contains stirred ore. Several agitation devices are correspondingly arranged in the several atmospheric pressure stirred leaching tanks, and the agitation devices are used to agitate the stirred ore in the atmospheric pressure stirred leaching tanks. Along the X-axis, the acid addition device is connected to the atmospheric pressure stirred leaching tank located at the first end, and the acid addition device is used to add acid to the atmospheric pressure stirred leaching tank located at the first end. The acid can overflow unidirectionally into the next atmospheric pressure stirred leaching tank.

[0044] During stirred leaching, the ore is evenly placed in several atmospheric pressure stirred leaching tanks. An acid adding device adds acid to the first atmospheric pressure stirred leaching tank. An agitating device is used to agitate the ore so that the acid and the ore come into full contact, allowing nickel to leach out. The acid can overflow from the first atmospheric pressure stirred leaching tank to the next atmospheric pressure stirred leaching tank. Through leaching one tank at a time, the nickel content in the acid gradually increases, achieving low-cost extraction of nickel.

[0045] The low-quality nickel ore circulating leaching system includes a washing module, a gravity separation module, the aforementioned heap leaching module, and the aforementioned agitated leaching module. The washing module is used to wash and screen the raw ore to separate the first target ore with a particle size not exceeding the target size and the agitated leaching ore with a particle size exceeding the target size. The gravity separation module is connected to the washing module and is used to perform gravity separation on the first target ore to form heap leaching ore. The heap leaching module is also connected to the gravity separation module and is used for atmospheric pressure circulating heap leaching of the heap leaching ore. The agitated leaching module is connected to the washing module and is used for atmospheric pressure agitated leaching of the agitated leaching ore.

[0046] The raw ore is cleaned and screened by a washing module to classify it into a primary target ore with a particle size no larger than the target size and a stirred leaching ore with a particle size larger than the target size. This ensures effective processing of the raw ore and improves the utilization rate of nickel resources. A gravity separation module further processes the screened primary target ore to form high-quality heap leaching ore. Stirred leaching and heap leaching modules respectively perform stirred leaching and atmospheric pressure heap leaching on the stirred and heap leaching ore to extract nickel. This system combines heap leaching and stirred leaching methods, flexibly addressing the processing needs of nickel ores with different particle sizes, thus improving the adaptability and flexibility of the process. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the heap immersion module provided by this utility model;

[0048] Figure 2 This is a schematic diagram of the atmospheric pressure heap leaching tank, acid tank, and acid circulation structure provided by this utility model;

[0049] Figure 3 This is a schematic diagram of the structure of the stirring and soaking module provided by this utility model;

[0050] Figure 4 This is a schematic diagram of the modules of the low-quality nickel ore circulating leaching system provided by this utility model.

[0051] In the picture:

[0052] 1. Ore washing module;

[0053] 2. Reselect module;

[0054] 3. Stirring and immersion module; 31. Atmospheric pressure stirred and immersion tank; 311. Tank body; 312. Baffle; 313. Filter screen; 32. Stirring device;

[0055] 4. Heap leaching module; 41. Atmospheric pressure heap leaching tank; 42. Acid tank; 431. Inlet pipe; 431a. Electromagnetic inlet valve; 432. Circulation pump; 433. Outlet pipe; 433a. Outlet branch pipe; 433b. Electromagnetic outlet valve; 434. Detection piece. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0057] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0060] Currently, in the hydrometallurgical process for laterite nickel ore, the ore is typically fed into a high-pressure reactor and mixed with sulfuric acid and steam for high-pressure leaching to extract nickel and cobalt. However, this method is generally suitable for high-quality or conventional nickel ore. Low-quality nickel ore, typically referring to ore with a nickel content of less than 1.2%, requires excessively high costs due to the consumption of large amounts of acid and high-temperature steam when using conventional high-temperature autoclave leaching.

[0061] To solve the above problems, such as Figures 1 to 4 As shown, this embodiment provides a low-quality nickel ore circulating leaching system, which includes a heap leaching module 4 for performing atmospheric pressure circulating heap leaching on the heap leaching ore. The heap leaching module 4 includes several atmospheric pressure heap leaching tanks 41, several acid tanks 42, and an acid circulation structure. Each of the several atmospheric pressure heap leaching tanks 41 contains heap leaching ore. The several acid tanks 42 are connected to the several atmospheric pressure heap leaching tanks 41 in a one-to-one correspondence, so that the acid in the atmospheric pressure heap leaching tanks 41 can flow back to the corresponding acid tanks 42. The acid circulation structure is used to connect the several atmospheric pressure heap leaching tanks 41 and the several acid tanks 42. The acid circulation structure can detect the nickel content in the acid in the several acid tanks 42 and guide the acid in the acid tanks 42 to the corresponding several atmospheric pressure heap leaching tanks 41 according to the detection results.

[0062] During heap leaching, the acid solution in several acid pools 42 is first guided to several corresponding atmospheric pressure heap leaching pools 41 through an acid circulation structure. Since the several atmospheric pressure heap leaching pools 41 are connected to the several acid pools 42 one by one, the acid solution can flow back from the atmospheric pressure heap leaching pool 41 to the corresponding acid pool 42 after reacting with the heap leaching ore. The acid circulation structure detects the nickel content in the acid solution in several acid pools 42, and according to the detection results, the acid solution in a certain acid pool 42 is dripped back into a certain atmospheric pressure heap leaching pool 41, thereby realizing the circulating drip irrigation of acid solution and realizing the circulating leaching of nickel ore. This allows the nickel in the acid solution to gradually accumulate, effectively achieving nickel leaching without increasing the amount of acid solution used, and reducing the processing cost of low-quality nickel ore.

[0063] It is understood that the number of acid tanks 42 is the same as the number of atmospheric pressure heap leaching tanks 41, and the specific number is determined by actual needs; this embodiment does not limit this. For example, as shown... Figure 1As shown, in this embodiment, there are 5 atmospheric pressure heap leaching tanks 41 and 5 acid tanks 42.

[0064] Specifically, such as Figure 1 , Figure 2 As shown, the acid circulation structure includes a circulation pump 432, an inlet pipe 431, an outlet pipe 433, several detection elements 434, and a control module. The circulation pump 432 is used to guide the acid from several acid tanks 42 to several corresponding atmospheric pressure heap leaching tanks 41. One end of the inlet pipe 431 is connected to the inlet of the circulation pump 432, and the other end of the inlet pipe 431 forms several inlet branch pipes, which are connected to several acid tanks 42 respectively. Each inlet branch pipe is equipped with an electromagnetic inlet valve 431a. One end of the outlet pipe 433 is connected to the outlet of the circulation pump 432, and the other end of the outlet pipe 433 forms several outlet branch pipes 433a, which are connected to several outlets. A solenoid discharge valve 433b is provided on the branch pipe 433a; a number of detection elements 434 are used to detect the nickel content of the acid in the corresponding acid pools 42; the control module is electrically connected to the solenoid inlet valve 431a, the solenoid discharge valve 433b, the circulation pump 432 and the detection elements 434. The control module can acquire the detection data of the detection elements 434 and control the opening and closing of each solenoid inlet valve 431a and each solenoid discharge valve 433b according to the detection data, and can also control the start and stop of the circulation pump 432.

[0065] This acid circulation structure, driven by a circulation pump 432, utilizes an inlet pipe 431 and an outlet pipe 433, along with electromagnetic inlet valves 431a and 433b on both, to precisely guide the acid in the acid tank 42 to the corresponding atmospheric pressure heap leaching tank 41. A detection element 434 monitors the nickel content in the acid in each acid tank 42 in real time and feeds the data back to the control module. The control module adjusts the on / off states of the electromagnetic inlet valves 431a and 433b based on the detection data, enabling the acid in a specific acid tank 42 to be dripped back into a specific atmospheric pressure heap leaching tank 41, thus achieving acid recycling and efficient nickel extraction.

[0066] In a specific implementation process, based on the nickel content in each acid pool 42 detected by the testing component 434, ranked from highest to lowest, a first acid, a second acid, ..., an nth acid are formed, along with corresponding first atmospheric pressure heap leaching pools, second atmospheric pressure heap leaching pools, ..., nth atmospheric pressure heap leaching pools. Then, the control module adjusts the on / off states of each electromagnetic inlet valve 431a and each electromagnetic outlet valve 433b to guide the nth acid to the (n-1)th atmospheric pressure heap leaching pool. The first acid, with the highest nickel content, is then guided to the nth atmospheric pressure heap leaching pool. A higher nickel concentration in the acid indicates a lower acid content, and consequently, a lower remaining nickel content in the corresponding atmospheric pressure heap leaching pool 41. Therefore, by directing the acid solution with lower nickel content to the atmospheric pressure heap leaching tank 41 with higher remaining nickel content, and the acid solution with higher nickel content to the atmospheric pressure heap leaching tank 41 with lower remaining nickel content, the acid solution can be fully utilized and waste reduced. On the other hand, it reduces the difference in leaching effect between the various atmospheric pressure heap leaching tanks 41, so that the nickel content in the final discharged acid solution is similar and there will be no large difference that would affect the subsequent processing.

[0067] Specifically, this heap leaching module 4 also includes a temporary storage tank, in which the heap leaching ore is temporarily stored. The outlet of the temporary storage tank is connected to several atmospheric pressure heap leaching tanks 41 to transport the heap leaching ore to each atmospheric pressure heap leaching tank 41. In this embodiment, the outlet of the temporary storage tank is connected to a main conveying pipeline, and the other end of the main conveying pipeline forms several branch conveying pipelines. The branch conveying pipelines are respectively connected to several atmospheric pressure heap leaching tanks 41 one by one. The heap leaching ore in the temporary storage tank is output through the main conveying pipeline and evenly transported to each atmospheric pressure heap leaching tank 41 through the several branch conveying pipelines.

[0068] Specifically, such as Figure 1 , Figure 2 As shown, the outlet branch pipe 433a has several drip holes, through which the acid in the acid tank 42 drips drop by drop into the atmospheric pressure heap leaching tank 41. This drop-by-drop method ensures that the acid is in full contact with the material in the atmospheric pressure heap leaching tank 41, thereby increasing the reaction area and reaction time, improving reaction efficiency, and avoiding waste of acid due to excessive supply or insufficient reaction.

[0069] Specifically, such as Figure 2 As shown, along the Z-axis, the bottom wall of the atmospheric pressure heap leaching tank 41 is inclined. A drain outlet is located at the bottom of the side wall of the atmospheric pressure heap leaching tank 41, which is located on the lower side of the bottom wall. The atmospheric pressure heap leaching tank 41 is connected to the acid tank 42 through the drain outlet. After the acid enters the atmospheric pressure heap leaching tank 41 and reacts with the heap leaching material, it flows into the acid tank 42 through the drain outlet under the action of gravity.

[0070] In this embodiment, the atmospheric pressure heap leaching tank 41 is a box without a top cover, and a heap leaching space communicating with the outside is formed inside the box. The heap leaching material is placed in the heap leaching space. The liquid outlet branch pipe 433a is distributed in a serpentine shape above the atmospheric pressure heap leaching tank 41, and several drip holes are spaced apart on the side of the liquid outlet branch pipe 433a facing the atmospheric pressure heap leaching tank 41.

[0071] Specifically, the acid tank 42 is equipped with a replenishment port for replenishing acid. Acid can be replenished into the acid tank 42 through the replenishment port, and the replenishment method is simple and convenient.

[0072] The low-quality nickel ore circulating leaching system in this embodiment also provides a stirred leaching module 3, such as... Figure 3 As shown, the stirring leaching module 3 is used for atmospheric pressure stirring leaching of ore. The stirring leaching module 3 includes several atmospheric pressure stirring leaching tanks 31, several stirring devices 32, and an acid adding device. The several atmospheric pressure stirring leaching tanks 31 are connected in sequence, and adjacent atmospheric pressure stirring leaching tanks 31 are unidirectionally connected along the X-axis. Each of the several atmospheric pressure stirring leaching tanks 31 contains ore to be stirred. Several stirring devices 32 are correspondingly arranged in the several atmospheric pressure stirring leaching tanks 31, and the stirring devices 32 are used to stir the ore to be stirred in the atmospheric pressure stirring leaching tanks 31. Along the X-axis, the acid adding device is connected to the first atmospheric pressure stirring leaching tank 31, and the acid adding device is used to add acid to the first atmospheric pressure stirring leaching tank 31. The acid can overflow unidirectionally into the next atmospheric pressure stirring leaching tank 31.

[0073] During the stirring leaching process, the stirring ore is evenly placed in several atmospheric pressure stirring leaching tanks 31. The acid adding device adds acid to the first atmospheric pressure stirring leaching tank 31. The stirring device 32 is used to stir the stirring ore so that the acid and the stirring ore can come into full contact, so that the nickel in the stirring ore can be leached out. The acid can overflow from the first atmospheric pressure stirring leaching tank 31 to the next atmospheric pressure stirring leaching tank 31. Through leaching one by one, the nickel content in the acid gradually accumulates, so as to achieve low-cost extraction of nickel.

[0074] Specifically, such as Figure 3 As shown, the atmospheric pressure stirred leaching tank 31 includes a tank body 311, a baffle 312, and a filter screen 313. A notch is formed on one side wall of the tank body 311 and is fixed flush with the next atmospheric pressure stirred leaching tank 31. The baffle 312 is fixed to the inner wall of the tank body 311 and parallel to the side wall with the notch. A gap exists between the baffle 312 and the bottom wall of the tank body 311. The filter screen 313 is fixed between the baffle 312 and the bottom wall, and its diameter is smaller than the diameter of the stirred leaching material. Along the X-axis, the baffle 312 and the filter screen 313 divide the tank body 311 into a first part and a second part. The stirred leaching material is placed in the first part, and an acid-adding device adds acid to the first part.

[0075] Understandably, the first part is far from the next atmospheric pressure stirred leaching tank 31, and the second part is close to the next atmospheric pressure stirred leaching tank 31. After acid is added to the first part containing the stirred leaching material through the acid adding device, the acid reacts with the stirred leaching material, leaching out the nickel in the stirred leaching material. The reacted acid flows through the filter screen 313 to the second part. As acid is added, the acid in the second part overflows into the next atmospheric pressure stirred leaching tank 31 through the gap. With each leaching, the nickel content in the acid gradually increases, achieving low-cost extraction of nickel.

[0076] Specifically, the agitation device 32 includes an agitator and a drive unit. The agitator is disposed in the atmospheric pressure stirred leaching tank 31, and the drive unit is used to drive the agitator to rotate. The agitator rotates under the drive of the drive unit to agitate the stirred ore in the atmospheric pressure stirred leaching tank 31, so that the stirred ore comes into full contact with the acid solution, thereby improving the nickel leaching efficiency.

[0077] In this embodiment, the agitator is disposed within the first part of the pool body 311, and the shaft of the agitator is sealed and rotatably inserted through the bottom wall of the pool body 311. The drive unit is disposed outside the pool body 311, and the output end of the drive unit is fixed to the shaft of the agitator to drive the agitator to rotate. Specifically, the drive unit is a motor.

[0078] This embodiment also provides a low-quality nickel ore circulating leaching system, such as Figure 4 As shown, the low-quality nickel ore circulating leaching system includes a washing module 1, a gravity separation module 2, the aforementioned heap leaching module 4, and the aforementioned stirred leaching module 3. The washing module 1 is used to wash and screen the raw ore to separate a first target ore with a particle size not exceeding the target particle size and a stirred leaching ore with a particle size exceeding the target particle size. The gravity separation module 2 is connected to the washing module 1 and is used to perform gravity separation on the first target ore to form the aforementioned heap leaching ore. The heap leaching module 4 is connected to the gravity separation module 2 and is used to perform atmospheric pressure circulating heap leaching on the heap leaching ore. The stirred leaching module 3 is connected to the washing module 1 and is used to perform atmospheric pressure stirred leaching on the stirred leaching ore.

[0079] The raw ore is washed and screened by the washing module 1, classifying it into a first target ore with a particle size no larger than the target size and a stirred leaching ore with a particle size larger than the target size. This ensures effective processing of the raw ore and improves the utilization rate of nickel resources. The first target ore is further subjected to gravity separation by the gravity separation module 2 to form high-quality heap leaching ore. The stirred leaching module 3 and the heap leaching module 4 perform stirred leaching and atmospheric pressure heap leaching on the stirred leaching ore and heap leaching ore, respectively, to extract nickel. The low-quality nickel ore circulating leaching system in this embodiment combines heap leaching and stirred leaching methods, which can flexibly meet the processing needs of nickel ores with different particle sizes, improving the adaptability and flexibility of the process.

[0080] Specifically, the washing module 1 includes a cylindrical washing machine and a trough washing machine. The cylindrical washing machine has a raw ore inlet, a first ore outlet, and a second ore outlet. The first ore outlet is used to discharge first ore with a particle size greater than a first particle size and is connected to the stirred leaching module 3. The second ore outlet is used to discharge second ore with a particle size not greater than the first particle size. The trough washing machine has a washing inlet, a first washing outlet, and a second washing outlet. The washing inlet is connected to the second ore outlet. The first washing outlet is used to discharge third ore with a particle size greater than the target particle size and is connected to the stirred leaching module 3. The stirred leaching ore includes the aforementioned first ore and the aforementioned third ore. The second washing outlet is used to discharge first target ore with a particle size not greater than the target particle size and is connected to the gravity separation module 2.

[0081] The particle size of the ore separated by a cylindrical washing machine is typically above 50mm. The minimum particle size of the separated ore can be changed by altering the mesh size of the cylindrical washing machine. Generally, the maximum particle size of laterite ore entering the cylindrical washing machine is 500mm. Therefore, the particle size of the ore separated by a cylindrical washing machine is approximately between 50-500mm.

[0082] It should be noted that the values ​​of the first particle size and the target particle size are determined by actual needs, and this embodiment does not limit them. In this embodiment, the value of the first particle size is 350mm, and the value of the target particle size is 1.5mm. The first ore outlet of the cylindrical washing machine is used to discharge the first ore with a particle size greater than 350mm to the stirred leaching module 3, and the second ore outlet is used to discharge the second ore with a particle size not greater than 350mm to the trough washing machine. The first washing outlet of the trough washing machine is used to discharge the third ore with a particle size greater than 1.5mm, that is, the third ore with a particle size between 1.5-350mm, to the stirred leaching module 3, and the second washing outlet is used to discharge the ore with a particle size not greater than 1.5mm to the gravity separation module 2. The stirred leaching ore includes the first ore and the third ore, that is, the particle size of the stirred leaching ore is between 1.5-500mm.

[0083] Specifically, the cylindrical washing machine has a screen cylinder and a lift. The screen cylinder is connected to the first ore outlet and the second ore outlet. The screen cylinder is used to screen the ore. The lifting end of the lift is hinged to one end of the screen cylinder. The lifting end of the lift moves up and down to adjust the tilt angle of the screen cylinder, thereby adjusting the washing speed of the cylindrical washing machine.

[0084] Specifically, the gravity separation module 2 includes a hydrocyclone and a spiral chute. The hydrocyclone has a swirling material inlet, a first swirling material outlet, and a second swirling material outlet. The swirling material inlet is connected to a second washing material outlet. The first swirling material outlet is used to discharge a fourth type of ore with a particle size greater than the second particle size, and the second swirling material outlet is used to discharge a fifth type of ore with a particle size not greater than the second particle size. The second swirling material outlet is connected to the heap leaching module 4. The spiral chute has a gravity separation material inlet, a first gravity separation material outlet, and a second gravity separation material outlet. The gravity separation material inlet is connected to the first swirling material outlet. The first gravity separation material outlet is used to discharge a sixth type of ore with a particle size greater than the target weight, and the second gravity separation material outlet is used to discharge a seventh type of ore with a particle size not greater than the target weight. The second gravity separation material outlet is connected to the heap leaching module 4. The heap leaching material includes the aforementioned fifth and seventh types of ore.

[0085] A hydrocyclone is a classifying device that uses centrifugal force to accelerate the settling velocity of slurry particles and separates particles based on particle size, shape, and specific gravity. In this embodiment, the second particle size is 53 μm. The first cyclone outlet of the hydrocyclone discharges the fourth ore material with a particle size greater than 53 μm, i.e., the fourth ore material with a particle size of 53 μm-1.5 mm, into the spiral chute. The second cyclone outlet of the hydrocyclone discharges the fifth ore material with a particle size not greater than 53 μm into the heap leaching module 4. The spiral chute performs specific gravity separation on the fourth ore material, screening out the sixth ore material with a weight greater than the target weight and the seventh ore material with a weight less than the target weight. The sixth ore material includes magnetite and chromite. Chromite has a relatively high hardness; if it enters the heap leaching module 4 for heap leaching, it will cause wear to the heap leaching module 4 at high flow rates, reducing the service life of the equipment. The seventh ore material is then sent to the heap leaching module 4.

[0086] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circulating leaching system for low-quality nickel ore, characterized in that, include: The washing module (1) is used to wash and screen the raw ore to screen out the first target ore with particles no larger than the target particle size and the stirred leaching ore with particles larger than the target particle size. The gravity separation module (2) is connected to the washing module (1) and is used to perform gravity separation on the first target ore to form heap leaching ore. Heap leaching module (4), which is connected to gravity separation module (2), is used to perform atmospheric pressure circulating heap leaching on the heap leaching ore. The stirring and leaching module (3) is connected to the ore washing module (1) and is used to perform atmospheric pressure stirring and leaching of the stirring and leaching ore. The heap immersion module (4) includes: Several atmospheric pressure heap leaching tanks (41) are provided with the heap leaching ore; A plurality of acid pools (42) are connected one-to-one with a plurality of atmospheric pressure heap leaching pools (41) so that the acid in the atmospheric pressure heap leaching pools (41) can flow back to the corresponding acid pools (42). An acid circulation structure is used to connect several atmospheric pressure heap leaching tanks (41) and several acid tanks (42). The acid circulation structure can detect the nickel content in the acid in several acid tanks (42) and guide the acid in several acid tanks (42) to the corresponding several atmospheric pressure heap leaching tanks (41) according to the detection results. The stirring and impregnation module (3) includes: Several atmospheric pressure stirred leaching tanks (31) are connected in sequence along the X-axis direction, and adjacent atmospheric pressure stirred leaching tanks (31) are all connected. The stirred leaching material is provided in each of the several atmospheric pressure stirred leaching tanks (31). A plurality of agitating devices (32) are arranged one-to-one in a plurality of atmospheric pressure leaching tanks (31), and the agitating devices (32) are used to agitate the leaching material in the atmospheric pressure leaching tanks (31); An acid-adding device is connected to the atmospheric pressure stirred immersion tank (31) located at the first end along the X-axis. The acid-adding device is used to add acid to the atmospheric pressure stirred immersion tank (31) located at the first end. The acid can overflow unidirectionally into the next atmospheric pressure stirred immersion tank (31).

2. The low-quality nickel ore circulating leaching system according to claim 1, characterized in that, The acid circulation structure includes: A circulating pump (432) is used to divert acid from the acid tanks (42) to the corresponding atmospheric pressure heap leaching tanks (41); The inlet pipe (431) has one end connected to the inlet of the circulating pump (432) and the other end has a plurality of inlet branch pipes. The plurality of inlet branch pipes are connected to a plurality of acid pools (42). The inlet branch pipes are equipped with electromagnetic inlet valves (431a). The outlet pipe (433) has one end connected to the outlet of the circulating pump (432) and the other end forms a plurality of outlet branch pipes (433a). The plurality of outlet branch pipes (433a) are connected to a plurality of atmospheric pressure heap leaching tanks (41). The outlet branch pipes (433a) are equipped with electromagnetic outlet valves (433b). Several testing devices (434) are used to detect the nickel content in the acid in the corresponding acid pools (42); The control module is electrically connected to the electromagnetic inlet valve (431a), the electromagnetic outlet valve (433b), the circulating pump (432), and the detection element (434).

3. The low-quality nickel ore circulating leaching system according to claim 2, characterized in that, The outlet branch pipe (433a) is provided with several drip holes, and the acid in the acid pool (42) drips into the atmospheric pressure heap leaching pool (41) through the drip holes.

4. The low-quality nickel ore circulating leaching system according to claim 1, characterized in that, Along the Z-axis, the bottom wall of the atmospheric pressure heap leaching tank (41) is inclined. A drain outlet is provided at the bottom of the side wall of the atmospheric pressure heap leaching tank (41) located on the lower side of the bottom wall of the atmospheric pressure heap leaching tank (41). The atmospheric pressure heap leaching tank (41) and the acid tank (42) are connected through the drain outlet.

5. The low-quality nickel ore circulating leaching system according to claim 1, characterized in that, The atmospheric pressure stirred leaching tank (31) includes: The pool body (311) has a notch formed on one side wall and is fixed flush with the next atmospheric pressure stirred soaking pool (31); A baffle (312) is fixed to the inner wall of the pool body (311) and parallel to the side wall with the notch. The baffle (312) has a gap with the bottom wall of the pool body (311). A filter screen (313) is fixed between the baffle (312) and the bottom wall of the pool body (311). The diameter of the filter screen (313) is smaller than the diameter of the stirred leaching material. Along the X-axis, the baffle (312) and the filter (313) divide the pool (311) into a first part and a second part, the stirred leaching material is placed in the first part, and the acid adding device adds acid to the first part.

6. The low-quality nickel ore circulating leaching system according to claim 1, characterized in that, The stirring device (32) includes: A stirring paddle and a driving component are provided. The stirring paddle is disposed in the atmospheric pressure stirring tank (31), and the driving component is used to drive the stirring paddle to rotate.

7. The low-quality nickel ore circulating leaching system according to claim 1, characterized in that, The ore washing module (1) includes: The cylindrical washing machine has a raw ore inlet, a first ore outlet and a second ore outlet. The first ore outlet is used to discharge the first ore with a particle size greater than the first particle size. The first ore outlet is connected to the stirring and leaching module (3). The second ore outlet is used to discharge the second ore with a particle size not greater than the first particle size. The trough-type ore washing machine has a washing inlet, a first washing outlet and a second washing outlet. The washing inlet is connected to the second ore outlet. The first washing outlet is used to discharge a third ore with a particle size greater than the target particle size. The first washing outlet is connected to the stirring and leaching module (3). The stirring and leaching ore includes the first ore and the third ore. The second washing outlet is used to discharge a first target ore with a particle size not greater than the target particle size. The second washing outlet is connected to the gravity separation module (2).

8. The low-quality nickel ore circulating leaching system according to claim 7, characterized in that, The reselection module (2) includes: The hydrocyclone has a cyclone material inlet, a first cyclone material outlet and a second cyclone material outlet. The cyclone material inlet is connected to the second washing material outlet. The first cyclone material outlet is used to discharge a fourth ore material with a particle size greater than the second particle size. The second cyclone material outlet is used to discharge a fifth ore material with a particle size not greater than the second particle size. The second cyclone material outlet is connected to the heap leaching module (4). The spiral chute has a gravity separation inlet, a first gravity separation outlet, and a second gravity separation outlet. The gravity separation inlet is connected to the first swirling material outlet. The first gravity separation outlet is used to discharge a sixth ore material whose weight is greater than the target weight. The second gravity separation outlet is used to discharge a seventh ore material whose weight is not greater than the target weight. The second gravity separation outlet is connected to the heap leaching module (4). The heap leaching material includes the fifth ore material and the seventh ore material.

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