A low grade nickel ore cycle leaching method and system

Abstract

The application discloses a low grade nickel ore cycle leaching method and system, the method includes the following steps: the raw ore is divided into mud type ore and particle ore; The mud type ore is sent to several atmospheric pressure heap leaching pools, and the grain type ore is sent to atmospheric pressure stirring leaching pools. Drip irrigation of acid solution to multiple atmospheric pressure heap leaching pools and recovery of the leaching solution of each atmospheric pressure heap leaching pool; The nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool was detected. According to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool, the leaching solution of a certain atmospheric pressure heap leaching pool was drip-irrigated into another certain atmospheric pressure heap leaching pool. This application provides a low grade nickel ore cycle leaching system, including a ore washing module, a gravity beneficiation module, a churn leaching module and a heap leaching module. The low grade nickel ore cycle leaching method and system provided in this application can realize the cycle leaching of nickel ore and gradually enrich nickel in the acid solution. On the premise of not increasing the amount of acid solution, the nickel leaching can be realized and the processing cost of low grade nickel ore can be effectively reduced.

Description

[0001] Description

[0002] A LOW GRADE NICKEL ORE CYCLE LEACHING METHOD AND SYSTEM

[0003] Technical Field

[0004] The application relates to the field of atmospheric pressure leaching technology of laterite nickel ore , in particular to a low grade nickel ore cycle leaching method and system .

[0005] Background

[0006] With the vigorous development of new energy automobile industry and the gradual depletion of high-quality nickel and cobalt resources , the industrial demand for Ni , Co and Mn metals in new energy ternary materials is rising day by day, and the development of laterite nickel ore with large reserves but low nickel grade has gradually become the focus of the industry . At present , in the wet smelting method of laterite nickel ore , the raw ore is usually washed first , and the slurry produced by the washing is sent to the thickener for thickening . When the concentration reaches a certain value , it is sent to the high pressure reactor to mix with sul furic acid and steam for high pressure leaching to extract nickel and cobalt in laterite nickel ore .

[0007] The above treatment methods are generally aimed at high quality or conventional quality nickel ore , and low grade nickel ore generally refers to the nickel content of less than 1 . 0 ore , using the above conventional high temperature autoreactor acid leaching, to consume a lot of acid and high temperature steam, the cost is too high .

[0008] Summary

[0009] The purpose of this application is to overcome the technical shortcomings mentioned above , propose a low grade nickel ore cycle leaching method and system, and solve the technical problem of high processing cost of low grade nickel ore in the existing technology . In order to achieve the above technical purpose , the application adopts the following technical scheme :

[0010] The application provides a low grade nickel ore cycle leaching method, including :

[0011] The raw ore is divided into mud type ore and grain type ore .

[0012] The mud type ore is sent to several atmospheric pressure heap leaching ponds , and the grain type ore is sent to atmospheric pressure stirring leaching ponds .

[0013] Drip irrigation of acid solution to multiple atmospheric pressure heap leaching pools and recovery of the leaching solution of each atmospheric pressure heap leaching pool ;

[0014] The nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool was detected .

[0015] According to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool , the leaching solution of a certain atmospheric pressure heap leaching pool was drip-irrigated into a certain atmospheric pressure heap leaching pool .

[0016] Further, the "drip irrigation of the leaching solution from an atmospheric pressure heap leaching pool into an atmospheric pressure heap leaching pool according to the nickel content concentration in the leaching solution from each atmospheric pressure heap leaching pool" comprises :

[0017] The leaching solution of each atmospheric pressure heap leaching pool is ranked from high to low according to the nickel content concentration, forming the first leaching solution, the second leaching solution, . . . , the n-th leaching solution, and the corresponding first atmospheric pressure heap leaching pool , second atmospheric pressure heap leaching pool , . . . The n-th atmospheric pressure heap leaching pool ;

[0018] The n-th leaching solution of the atmospheric pressure heap leaching pool is imported into the n- 1 atmospheric pressure heap leaching pool , and the first leaching solution with the highest nickel content concentration is imported into the n-th atmospheric pressure heap leaching pool , where n > 1 .

[0019] The application also provides a low-grade nickel ore cycle leaching system, based on the low-grade nickel ore cycle leaching method, including a washing module , a gravity beneficiation module , a churn leaching module and a heap leaching module , the washing module is connected with the gravity beneficiation module and the churn leaching module pipeline , the gravity beneficiation module is connected with the heap leaching module pipeline , the washing module is used to clean the raw ore . The particle ore is formed and the mud type ore is in the form of mud, the gravity separation module is used for gravity separation of the mud type ore to form heap leaching material , the stirring leaching module is used for atmospheric pressure stirring leaching of the grain type ore , the heap leaching module is used for atmospheric pressure cyclic heap leaching of the heap leaching material .

[0020] Further, the stirring leaching module comprises an acid adding device , a number o f atmospheric pressure stirring leaching pools and a stirring device corresponding to the atmospheric pressure stirring leaching pools , a number of atmospheric pressure stirring leaching pools are connected end to end in a gradually decreasing way, and the stirring device is arranged at the bottom of the atmospheric pressure stirring leaching pool . Used for stirring the grain type ore in the atmospheric pressure stirring leaching pool , the acid adding device is connected with the atmospheric pressure stirring leaching pool pipeline at the head end, and is used to add acid to the atmospheric pressure stirring leaching pool at the head end .

[0021] Further, the atmospheric pressure stirring pool comprises a pool body, baf fle and filter, one side wall of the pool body forms a notch and is fixed flush with the next level of the atmospheric pressure stirring pool , the baf fle and the pool body wall is fixed and parallel to the side with the notch, The baf fle plate and the bottom surface of the body form a gap, the filter i s fixed between the baf fle plate and the bottom surface of the pool body, the filter hole diameter of the filter is less than the diameter of the particle ore .

[0022] Further, the stirring device comprises an stirring paddle and a driving motor, the stirring paddle is arranged in the first part of the pool body and is located at the bottom of the pool body, the driving motor is located outside the pool body, the output end o f the driving motor is fixed with the stirring paddle shaft , and the output end of the driving motor is fixed with the stirring paddle shaft . The stirring paddle is driven to rotate relative to the pool body .

[0023] Further, the heap leaching module comprises a slurry temporary storage tank, a plurality of atmospheric pressure heap leaching pools , a plurality of acid pools corresponding to the atmospheric pressure heap leaching pool one by one and an acid circulating structure . The feed port of the slurry temporary storage tank is connected with the pipeline of the gravity beneficiation module . The discharge port of the slurry temporary storage tank is connected with all the pipelines of the atmospheric pressure heap leaching pool , the atmospheric pressure heap leaching pool discharge port is connected with the acid pool , the acid circulation structure is connected with the atmospheric pressure heap leaching pool and the acid pool , for detecting the nickel content in the acid pool and according to the test results , the liquid in the acid pool is led to the corresponding atmospheric pressure heap leaching pool .

[0024] Further, the atmospheric pressure heap leaching pool is a box with no upper end, and the atmospheric pressure heap leaching pool forms a heap leaching space connected with the outside space , and the bottom of the atmospheric pressure heap leaching pool is inclined, forming a higher side of the bottom surface and the lower side of the bottom surface , A row of liquid port is arranged on the bottom of the lower side of the bottom surface of the atmospheric pressure heap leaching pool , and the drainage port is connected with the acid pool ; A feed port is arranged on the higher side of the bottom surface of the atmospheric pressure heap leaching pool , and the feed port is connected with the slurry temporary storage tank pipeline .

[0025] Further, the acid cycle structure comprises a liquid inlet pipe , a circulating pump, a liquid outlet pipe , a number of nickel content detection modules and a control module . One end of the liquid inlet pipe is connected with the liquid inlet of the circulating pump, and the other end is subdivided to form a number of liquid inlet branches . The liquid inlet branch is connected with each of the acid pool , and the liquid inlet branch is provided with an electromagnetic liquid inlet valve . One end of the liquid outlet pipe is connected with the liquid outlet of the circulating pump, and the other end is subdivided to form a plurality of liquid outlet pipes . The liquid outlet pipe extends to the above each of the atmospheric pressure heap leaching pool , which is used to import the liquid in the acid pool into the atmospheric pressure heap leaching pool . The liquid outlet pipe is provided with an electromagnetic liquid outlet valve , and a plurality of the nickel content detection modules are fixed on the inner wall of the liquid inlet branch pipe for detecting the nickel content of the liquid in the liquid inlet branch pipe . The control module is electrically connected with the electromagnetic liquid inlet valve , the electromagnetic liquid outlet valve , the circulating pump and the nickel content detection module . The control module obtains the detection data of all the nickel content detection modules , and controls the opening and closing of each electromagnetic liquid inlet valve and the electromagnetic liquid outlet valve according to the detection data .

[0026] Further, the liquid outlet branch pipe arranged in a serpentine shape above the atmospheric pressure heap leaching pool , and the bottom of the liquid outlet branch pipe is provided with a plurality of drip holes , and the drip hole makes the liquid fall into the atmospheric pressure heap leaching pool in a drip-by-drop manner .

[0027] Compared with the existing technology, the low grade nickel ore cycle leaching method and system provided in thi s application, sorting out the grain type ore and mud type ore , mixing the grain type ore , mud type ore for heap leaching, detecting the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool and the steps of drip irrigation the leaching solution of a certain atmospheric pressure heap leaching pool according to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool , In this way, the cyclic drip irrigation of acid solution can be reali zed, and the nickel in the acid solution can be gradually enriched . On the premise of not increasing the amount of acid solution, the nickel leaching can be reali zed, and the processing cost of low-grade nickel ore can be ef fectively reduced .

[0028] The above description is only an overview of the technical scheme of this application . In order to better understand the technical means of this application and implement it in accordance with the contents of the speci fication, a better example of this application and the attached drawings are explained in detail as follows . The speci fic embodiments of this application are given in detail by the following embodiments and the attached drawings .

[0029] Brief Description Of The Drawings

[0030] Figure 1 is the module diagram of the low-grade nickel ore cycle leaching system provided in this application;

[0031] Figure 2 is the structure diagram of the churn module in Figure 1 ;

[0032] Figure 3 is the module diagram of the heap immersion module in Figure 1 ;

[0033] Figure 4 is a schematic of the structure of the heap dip module in Figure 1 .

[0034] Note on the attached drawings :

[0035] 1- ore washing module , 2- gravity beneficiation module , 3- stirring leaching module , 31- atmospheric pressure stirring leaching pool , 311- pool body, 312- baf fle , 313- filter, 32- stirring device , 321- stirring paddle , 4- heap leaching module , 41- atmospheric pressure heap leaching pool , 42 - acid pool , 43- acid circulation structure , 431- liquid inlet pipe , 431a- electromagnetic liquid inlet valve , 432- circulation pump, 433- liquid outlet pipe , 433a- liquid outlet branch pipe , 433b- electromagnetic liquid outlet valve , 434- nickel content detection module .

[0036] Detailed Description

[0037] In order to make the purpose , technical scheme and advantages of this application more clearly, the application is further explained in detail by combining the attached drawings and embodiments . It is understood that the speci fic embodiments described herein are intended only to explain this Application and are not intended to quali fy it .

[0038] The application provides a low grade nickel ore cycle leaching method, including :

[0039] 51 , the raw ore is divided into mud type ore and particle ore ;

[0040] 52 . Send the mud type ore to several atmospheric pressure heap leaching ponds , and send the granular ore to atmospheric pressure stirring leaching ponds ; S3 . Drip irrigation of acid solution to multiple atmospheric pressure heap leaching pools and recovery of the leaching solution from each atmospheric pressure heap leaching pool ;

[0041] S4 . Test the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool ;

[0042] S5 . According to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool , drip irrigate the leaching solution of another certain atmospheric pressure heap leaching pool into a certain atmospheric pressure heap leaching pool .

[0043] The application provides a low grade nickel ore cycle leaching method, including steps to detect the concentration of nickel content in the leaching solution of each atmospheric pressure heap leaching pool and steps according to the concentration of nickel content in the leaching solution of each atmospheric pressure heap leaching pool to drip irrigation of a atmospheric pressure heap leaching pool , so as to reali ze the cyclic drip irrigation of acid solution, nickel ore cycle leaching . The nickel in the acid solution is gradually enriched, and the nickel leaching is reali zed without increasing the amount of acid solution, which ef fectively reduces the processing cost of low grade nickel ore .

[0044] Speci fically, in Step S5 , the following steps are included :

[0045] 551 . The leaching solution of each atmospheric pressure heap leaching pool is ranked from high to low according to the nickel content concentration, forming the first leaching solution, the second leaching solution, . . . , the n-th leaching solution, and the corresponding first atmospheric pressure heap leaching pool , second atmospheric pressure heap leaching pool , . . . The n-th atmospheric pressure heap leaching pool ;

[0046] 552 . The n-th leaching solution of the atmospheric pressure heap leaching pool is imported into the n- 1 atmospheric pressure heap leaching pool , and the first leaching solution with the highest nickel content concentration is imported into the n-th atmospheric pressure heap leaching pool , where n > 1 .

[0047] The purpose of this design is that the higher the nickel content concentration of the leaching solution, the less acid content in the leaching solution, and the less residual nickel content in the atmospheric pressure leaching pool corresponding to the leaching solution. Therefore, the leaching solution with low nickel content concentration (high acid concentration) is led to the atmospheric pressure leaching pool with more residual nickel content; The leaching solution with higher nickel content (lower acid concentration) was led to the atmospheric pressure leaching pool with less residual nickel content. On the one hand, it can make full use of the acid solution and reduce the waste of the acid solution. On the other hand, it can reduce the difference between the leaching effects of each atmospheric pressure leaching pool, so that the nickel content of the final discharged leaching solution is close, and there is no great difference in the subsequent treatment process.

[0048] This application also provides a low-grade nickel ore cycle leaching system, see Figure 1-4, including washing module ( '1' ) , gravity beneficiation module ( '2' ) , churn leaching module ( '3' ) and heap leaching module ( '4' ) , the washing module ( '1' ) is connected with the gravity beneficiation module ( '2' ) and the churn leaching module ( '3' ) pipeline, the gravity beneficiation module ( '2' ) is connected with the heap leaching module ( '4' ) pipeline, the washing module ( '1' ) is used to clean the raw ore. The particle ore is formed and the mud type ore is in the form of mud. The gravity separation module ( '2' ) is used for gravity separation of mud type ore to form heap leaching material, the stirring leaching module ( '3' ) is used for atmospheric pressure stirring leaching of the grain type ore, and the heap leaching module ( '4' ) is used for atmospheric pressure cyclic heap leaching of the heap leaching material.

[0049] Specifically, the ore washing module ( '1' ) comprises a cylinder ore washing machine and a trough ore washing machine. The cylinder ore washing machine is connected with the trough ore washing machine through a pipeline, and the trough ore washing machine is connected with the gravity beneficiation module and the stir leaching module pipeline. The cylinder ore washing machine preliminarly washes the raw ore and divides the raw ore into a mixture of particles with larger particles and smaller particles and mud type ore. The trough ore washing machine is used to divide the mixture of particles with smaller particles and mud type ore into particles with smaller particles and mud type ore. Further, the particle si ze of the ore separated by the cylinder ore washing machine is usually more than about 50mm, and the minimum particle si ze of the separated ore can be changed by changing the mesh si ze of the cylinder ore washing machine . Usually, the maximum si ze of the laterite ore entering the cylinder ore washing machine is 500mm . Therefore , the particle si ze of the ore separated by the cylinder ore washing machine is approximately between 50 and 500mm . In this example , the first ore material outlet of the cylinder ore washing machine is used to discharge ore material with particle si ze greater than 350mm to the churn leaching module , and the second ore material outlet is used to discharge ore material with particle si ze less than 350mm to the trough ore washing machine .

[0050] Further, the cylinder ore washing machine has a screen cylinder and a li ft , the screen cylinder and the first ore outlet and the second ore outlet is connected, the screen cylinder is used for screening the ore , the larger particles of ore from the first ore outlet discharge , smaller particles of ore from the second ore outlet discharge , The li fting end of the elevator is hinged with the one end of the screen cylinder, and the li fting end of the elevator is li fted to adj ust the tilt Angle of the screen cylinder, so as to adj ust the washing speed of the cylinder ore washing machine .

[0051] Further, the ore with a particle si ze of not more than 350mm then enters the trough type ore washing machine for ore washing . Generally, the laterite ore in the slurry after washing by the trough type ore washing machine has a particle si ze of less than 2mm . In this example , the first washing outlet of the trough type ore washing machine is used to discharge the ore with a particle si ze of 1 . 5-350mm to the churn leaching module . The second washing outlet is used to discharge ore with a particle si ze of not more than 1 . 5mm to the reseparation module .

[0052] Speci fically, the gravity beneficiation module ( ' 2 ' ) comprises a hydrocyclone and a spiral chute , the feed port of the hydrocyclone is connected with the trough type ore washing machine through a pipeline , the first discharge port of the hydrocyclone is connected with the heap leaching module through a pipeline , the second discharge port of the hydrocyclone is connected with the spiral chute through a pipeline , The first discharge port of the spiral chute is connected with the heap immersion module through a pipeline. The hydrocyclone is a grading device that uses centrifugal force to accelerate the settling speed of slurry particles and separates particles according to particle size, shape and specific gravity. In this example, the second discharge port of the hydrocyclone is used to discharge ore with a particle size of 53pm- 1.5mm to the spiral chute, and the first discharge port of the hydrocyclone is used to discharge ore with a particle size of not more than 53pm to the heap leaching module; The spiral chute carries on the specific gravity sorting of the ore material, and screens out the heavier ore material and the lighter ore material. The heavier ore material includes magnetite ore material and chromite ore material, the hardness of chromite material is larger, if it enters the follow-up equipment, it will cause wear to the follow-up equipment at high flow rate, reduce the service life of the equipment, the lighter ore material is sent to the heap leaching module.

[0053] Specifically, the stirring immersion module ( '3' ) comprises an acid adding device, a number of atmospheric pressure stirring immersion pools ( ' 31 ’ ) and a stirring device ( ' 32 ’ ) corresponding to the atmospheric pressure stirring immersion pool ( '31' ) , a number of atmospheric pressure stirring immersion pools ( ' 31 ’ ) are connected head to tail in a gradually decreasing way, and the stirring device ( '32' ) is arranged at the bottom of the atmospheric pressure stirring immersion pool ( '31' ) . Used for stirring the grain type ore in the atmospheric pressure agitator ( '31' ) , the acid adding device is connected with the atmospheric pressure agitator ( '31' ) pipeline at the head end, and is used to add acid to the atmospheric pressure agitator ( ' 31 ’ ) at the head end.

[0054] Further, the atmospheric pressure stirring pool ( ' 31 ’ ) comprises a pool body ( '311' ) , baffle ( '312' ) and filter ( '313' ) . One side wall of the pool body ( ' 311 ’ ) forms a notch and is fixed with the next level of the atmospheric pressure stirring pool ( '31' ) , and the baffle ( '312' ) is fixed with the inner wall of the pool body ( '311' ) and is parallel to the side with the notch. The baffle plate ( '312' ) and the inner bottom surface of the body ( '311' ) form a gap, and the filter mesh ( ' 313 ’ ) is fixed between the baffle plate ( ' 312 ’ ) and the inner bottom surface of the pool body ( ' 311 ’ ) , and the filter hole diameter of the filter mesh ( '313' ) is less than the diameter of the particle ore.

[0055] The baffling plate ( ' 312 ' ) and the filter screen ( ' 313 ' ) separate the space within the pool body ( ' 311 ’ ) into a first part away from the notch and a second part near the notch. When used, the same amount of grain type ore is poured into the first part of each pool ( '311' ) , the acid adding device is added to the first part of the acid solution, the acid solution is in contact with the grain type ore, the nickel in the grain type ore is leached, and from the notch overflow to the next level of the atmospheric pressure mixing leaching pool ( '31' ) , through the step by step leaching, the nickel content in the acid solution is gradually enriched, and the low-cost extraction of nickel is realized.

[0056] Further, the stirring device ( ' 32 ’ ) comprises a stirring paddle ( '321' ) and a driving motor, the stirring paddle ( '321' ) is arranged in the first part of the pool body ( '311' ) and is located at the bottom of the pool body ( ' 311 ’ ) , the driving motor is located outside the pool body ( '311' ) , and the output end of the driving motor is fixed with the axis of the stirring paddle ( ' 321 ’ ) . The agitation paddle ( ' 321 ’ ) is driven to rotate relative to the pool body ( ' 311 ’ ) . The particle ore in the pool body ( '311' ) is agitated to make the particle ore fully contact with the acid solution and improve the efficiency of nickel leaching.

[0057] Specifically, the heap leaching module ( '4' ) comprises a slurry temporary storage tank (not shown in the figure) , a plurality of atmospheric pressure heap leaching pool ( '41' ) , a plurality of acid pool ( '42' ) corresponding to the atmospheric pressure heap leaching pool ( ' 41 ’ ) one by one, and an acid circulating structure ( '43' ) . The feed port of the slurry temporary storage tank is connected with the reselection module ( '2' ) pipeline, and the discharge port of the slurry temporary storage tank is connected with all the atmospheric pressure heap leaching pool ( ' 41 ’ ) pipeline. The atmospheric pressure reactor leaching pool ( '41' ) drainage port and the acid pool ( ' 42 ’ ) is connected, the acid circulation structure ( ' 43 ’ ) is connected to the atmospheric pressure reactor leaching pool ( ' 41 ’ ) and the acid pool ( '42' ) , for detecting the nickel content in the acid pool ( ' 42 ’ ) and according to the test results to the acid pool ( '42' ) in the liquid lead to the corresponding atmospheric pressure reactor leaching pool.

[0058] Further, the slurry outlet of the slurry temporary storage tank is connected with the slurry main pipe, and the slurry main pipe is extended to form a number of slurry sub-pipes, which are respectively connected with the atmospheric pressure heap leaching pool ( ' 41 ’ ) one by one. The slurry temporary storage tank is used to temporarily store the heap leaching ore material formed by the gravity beneficiation module ( '2' ) . And can lead the temporarily stored heap leaching ore to each atmospheric pressure heap leaching pool evenly ( '41' ) .

[0059] Further, the atmospheric pressure heap leaching pool ( '41' ) is a box body without an upper end, the atmospheric pressure heap leaching pool ( '41' ) forms a heap leaching space connected with the outside space, the atmospheric pressure heap leaching pool ( '41' ) inside the bottom surface is inclined, forming a higher side of the bottom surface and the lower side of the bottom surface, the atmospheric pressure heap leaching pool ( '41' ) on the bottom of the lower side is provided with a row of liquid port, The drainage port is connected with the acid pool ( '42' ) ; A feed port is arranged on the higher side of the bottom surface of the atmospheric pressure heap leaching pool ( '41' ) , and the feed port is connected with the slurry temporary storage tank pipeline. When used, the slurry temporary storage tank guides the heap leaching ore material into the atmospheric pressure heap leaching pool ( '41' ) , and the heap leaching liquid generated by the heap leaching flow along the bottom of the atmospheric pressure heap leaching pool ( '41' ) to the drain port, and is discharged to the acid pool ( '42' ) through the drain port .

[0060] Further, the acid pool ( '42' ) is an upper end of the box, there is an initial acid storage, the acid pool ( '42' ) and the drainage port is connected, the acid pool ( '42' ) is provided with a liquid replenishment port for the supplement of acid.

[0061] Further, the acid circulation structure ( '43' ) comprises a liquid inlet pipe ( '431' ) , a circulating pump ( '432' ) , a liquid outlet pipe ( '433' ) , a number of nickel content detection modules ( '434' ) and a control module . One end of the liquid inlet pipe ( '431' ) is connected with the liquid inlet port of the circulating pump ( ' 432 ' ) , and the other end is subdivided to form a number of liquid inlet pipes , and the liquid inlet pipes are connected with each of the acid pool ( ' 42 ’ ) , respectively . The liquid inlet branch ( ' 431 ’ ) is provided with an electromagnetic liquid inlet valve ( ' 431a' ) , one end of the liquid outlet pipe ( ' 433 ' ) is connected with the liquid outlet port of the circulation pump ( ' 432 ’ ) , and the other end is subdivided to form a plurality of liquid outlet pipe ( ' 433a' ) , the liquid outlet pipe ( ' 433a' ) extends to each of the atmospheric pressure heap leaching pool ( ' 41 ’ ) above , for the atmospheric pressure heap leaching pool 41 into the liquid in the acid pool ( ' 42 ' ) , The liquid outlet pipe ( ' 433a' ) is provided with an electromagnetic liquid outlet valve ( ' 433b' ) , and a plurality of the nickel content detection module ( ' 434 ’ ) is fixed on the inner wall of the liquid inlet branch pipe for detecting the nickel content of the liquid in the liquid inlet branch pipe . The control module is electrically connected with the electromagnetic liquid inlet valve ( ' 431a' ) , the electromagnetic liquid outlet valve ( ' 433b' ) , the circulation pump ( ' 432 ’ ) and the nickel content detection module ( ' 434 ' ) . The control module obtains the detection data of all the nickel content detection module ( ' 434 ' ) And according to the test data control each electromagnetic liquid inlet valve ( ' 431a' ) and the electromagnetic liquid outlet valve ( ' 433b' ) opening and closing .

[0062] Further, the liquid outlet branch ( ' 433a' ) is arranged in a serpentine shape above the atmospheric pressure heap leaching pool ( ' 41 ' ) , and the bottom of the liquid outlet branch ( ' 433a' ) is provided with a plurality of drip holes , and the drip holes make the liquid fall into the atmospheric pressure heap leaching pool ( ' 41 ' ) in a drip-by-drop manner .

[0063] In order to better understand this application, the technical scheme of this application is explained in detail in combination with the attached drawings :

[0064] First , the raw ore is sent to the cylinder ore washing machine for ore washing, and the raw ore is divided into larger particles and smaller particles and a mixture of mud type ore . The trough ore washing machine divides the smaller particles and the mixture of mud type ore into smaller particles and mud type ore , and the larger particles and smaller particles are sent to the stirring leaching module ( ' 3 ' ) for stirring leaching . The mud type ore is successively passed through the hydrocyclone and the spiral chute to screen out the heavier chromite material and the lighter heap leaching material , and the heap leaching material is sent to the heap leaching module ( ' 4 ' ) for heap leaching .

[0065] When stirring, the granular ore uni formly inverted all pool ( ' 311 ' ) , the acid adding device to the first part of the acid solution, the driving motor drives the stirring paddle ( ' 321 ’ ) rotation, stirring the granular ore , the acid solution and the granular ore full contact , the nickel in the granular ore leaching, and overflow from the notch to the next level of the atmospheric pressure stirring pool ( ' 31 ' ) , through step by step leaching, The nickel content in the acid solution was gradually enriched to reali ze the low-cost extraction of nickel .

[0066] During heap leaching, the mud type ore is uni formly inverted in all the atmospheric pressure heap leaching pool ( ' 41 ' ) , and the acid cycle structure ( ' 43 ' ) extracts the acid liquid in the acid pool ( ' 42 ' ) , drops into the atmospheric pressure heap leaching pool ( ' 41 ' ) , reacts with the mud type ore , so that the nickel in the mud type ore is leached, and flows into the acid pool ( ' 42 ' ) , so that the nickel content in the acid solution is gradually enriched . To achieve low cost extraction of nickel .

[0067] Beneficial ef fects of this application :

[0068] The application provides a low grade nickel ore recycling leaching method and system, sorting out the grain type ore and mud type ore , the grain type ore for mixing leaching, mud type ore for heap leaching, testing the concentration of nickel content in the leaching solution of each atmospheric pressure heap leaching pool and steps according to the concentration of nickel content in the leaching solution of each atmospheric pressure heap leaching pool , drip irrigation the leaching solution of a atmospheric pressure heap leaching pool into another certain atmospheric pressure heap leaching pool , In this way, the cyclic drip irrigation of acid solution can be reali zed, and the nickel in the acid solution can be gradually enriched . On the premise of not increasing the amount of acid solution, the nickel leaching can be reali zed, and the processing cost of low-grade nickel ore can be ef fectively reduced . The above speci fic mode of implementation of this application shall not limit the scope of protection of this application . Any other corresponding changes and deformations made according to the technical ideas of the application shall be included in the scope of protection of the claims of the Application .

Claims

Claims1 . A low grade nickel ore cycle leaching method, which is characteri zed by the following steps : the raw ore is divided into mud type ore and particle type ore ; The mud type ore is sent to several atmospheric pressure heap leaching pools , and the grain type ore is sent to atmospheric pressure stirring leaching ponds . Drip irrigation of acid solution to multiple atmospheric pressure heap leaching pools and recovery of the leaching solution of each atmospheric pressure heap leaching pool ; The nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool was detected . According to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool , the leaching solution of a certain atmospheric pressure heap leaching pool was drip-irrigated into another certain atmospheric pressure heap leaching pool .2 . According to claim 1 , the low-grade nickel ore cycle leaching method is characteri zed by the drip irrigation of the leaching solution from a atmospheric pressure heap leaching pool into another atmospheric pressure heap leaching pool according to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool , including :The leaching solution of each atmospheric pressure heap leaching pool is ranked from high to low according to the nickel content concentration, forming the first leaching solution, the second leaching solution, . . . , the n-th leaching solution, and the corresponding first atmospheric pressure heap leaching pool , second atmospheric pressure heap leaching pool , . . . The n-th atmospheric pressure heap leaching pool ;The n-th leaching solution of the atmospheric pressure heap leaching pool is imported into the n- 1 atmospheric pressure heap leaching pool , and the first leaching solution with the highest nickel content concentration is imported into the n-th atmospheric pressure heap leaching pool , where n > 1 .3 . A low grade nickel ore cycle leaching system is based on the low grade nickel ore cycle leaching method mentioned in either of claims 1 and 2 , which is characteri zed by including a washing module , a gravity beneficiation module , a stirring leaching module and a heap leaching module . The washing module is connected with the gravity beneficiation module and the stirring leaching module pipelines , and the gravity beneficiation module i s connected with the heap leaching module pipelines . The ore washing module is used to clean the raw ore , form the granular ore and the slurry mud type ore , the gravity separation module is used for gravity separation of the mud type ore to form heap leaching material , the stirring leaching module is used for atmospheric pressure stirring leaching of the grain type ore , the heap leaching module is used for atmospheric pressure cyclic heap leaching of the heap leaching material .4 . According to the claims 3 , the low-grade nickel ore cycle leaching system is characteri zed by that the stirring leaching module comprises an acid adding device , a number of atmospheric pressure stirring leaching pools and a stirring device corresponding to the atmospheric pres sure stirring leaching pools , a number of atmospheric pressure stirring leaching pools are connected end to end in a gradually decreasing way, and the stirring device is arranged at the bottom of the atmospheric pressure stirring leaching pool . Used for stirring the grain type ore in the atmospheric pressure stirring leaching pool , the acid adding device is connected with the atmospheric pressure stirring leaching pool pipeline at the head end, and is used to add acid to the atmospheric pressure stirring leaching pool at the head end .5 . According to the claims 4 , the low-grade nickel ore cycle leaching system is characteri zed by the atmospheric pressure stirring pool comprises a pool body, baf fle and filter, one side wall of the pool body forms a notch and is fixed flush with the next level of the atmospheric pressure stirring pool , the baf fle and the pool body wall is fixed and parallel to the side with the notch, The baf fle plate and the bottom surface of the body form a gap, the filter is fixed between the baf fle plate and the bottom surface of the pool body,the filter hole diameter of the filter is less than the diameter of the particle ore .6 . According to claims 4 , the low-grade nickel ore cycle leaching system is characteri zed in that the stirring device comprises an stirring paddle and a driving motor, the stirring paddle is arranged in the first part of the pool body and is located at the bottom of the pool body, the driving motor is located outside the pool body, the output end of the driving motor is fixed with the stirring paddle shaft , and the output end of the driving motor is fixed with the stirring paddle shaft . The stirring paddle is driven to rotate relative to the pool body .7 . According to claims 3 , the low-grade nickel ore cycle leaching system is characteri zed by the heap leaching module comprises a slurry temporary storage tank, a plurality of atmospheric pressure heap leaching pools , a plurality of acid pools corresponding to the atmospheric pressure heap leaching pool one by one and an acid circulating structure . The feed port of the slurry temporary storage tank is connected with the pipeline of the gravity beneficiation module . The discharge port of the slurry temporary storage tank is connected with all the pipelines of the atmospheric pressure heap leaching pool , the atmospheric pressure heap leaching pool discharge port is connected with the acid pool , the acid circulation structure is connected with the atmospheric pressure heap leaching pool and the acid pool , for detecting the nickel content in the acid pool and according to the test results , the liquid in the acid pool is led to the corresponding atmospheric pressure heap leaching pool .8 . According to claim 7 , the low-grade nickel ore cycle leaching system is characteri zed by that the atmospheric pressure heap leaching pool is a box with no upper end, and the atmospheric pressure heap leaching pool forms a heap leaching space connected with the outside space , and the bottom of the atmospheric pressure heap leaching pool is inclined, forming a higher side of the bottom surface and the lower side of the bottom surface , A row of liquid port is arranged on the bottom of the lower side of the bottom surface of the atmospheric pressure heap leaching pool , and the drainage portis connected with the acid pool ; A feed port is arranged on the higher side of the bottom surface of the atmospheric pressure heap leaching pool , and the feed port is connected with the slurry temporary storage tank pipeline .9 . According to claims 7 , the low-grade nickel ore cycle leaching system is characteri zed in that the acid cycle structure comprises a liquid inlet pipe , a circulating pump, a liquid outlet pipe , a number of nickel content detection modules and a control module . One end of the liquid inlet pipe is connected with the liquid inlet of the circulating pump, and the other end is subdivided to form a number of liquid inlet branches . The liquid inlet branch is connected with each of the acid pool , and the liquid inlet branch is provided with an electromagnetic liquid inlet valve . One end of the liquid outlet pipe is connected with the liquid outlet of the circulating pump, and the other end is subdivided to form a plurality of liquid outlet pipes . The liquid outlet pipe extends to the above each of the atmospheric pressure heap leaching pool , which is used to import the liquid in the acid pool into the atmospheric pressure heap leaching pool . The liquid outlet pipe is provided with an electromagnetic liquid outlet valve , and a plurality of the nickel content detection modules are fixed on the inner wall of the liquid inlet branch pipe for detecting the nickel content of the liquid in the liquid inlet branch pipe . The control module is electrically connected with the electromagnetic liquid inlet valve , the electromagnetic liquid outlet valve , the circulating pump and the nickel content detection module . The control module obtains the detection data of all the nickel content detection modules , and controls the opening and closing of each electromagnetic liquid inlet valve and the electromagnetic liquid outlet valve according to the detection data .10 . According to claim 7 , the low-grade nickel ore cycling leaching system is characteri zed by the liquid outlet branch pipe arranged in a serpentine shape above the atmospheric pressure heap leaching pool , and the bottom of the liquid outlet branch pipe is provided with a plurality of drip holes , and the drip hole makes the liquid fall into the atmospheric pressure heap leaching pool in a drip-by-drop manner .

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