Laterite nickel ore dump leaching system

Abstract

Disclosed in the present application is a laterite nickel ore dump leaching system, comprising at least one dump leaching tank, a liquid storage tank and an acid-spraying unit. The dump leaching tank comprises a tank body and two partition plates, wherein the bottom surface of the tank body is an inclined surface, and the side wall of the tank body at the lower end is open; the two partition plates are arranged at an interval in the tank body from high to low along the inclined surface, so as to divide the interior of the tank body into a dump leaching cavity, a filter cavity and a liquid discharge cavity distributed from high to low along the inclined surface; and each of the partition plates is provided with a plurality of passage openings. The liquid storage tank is arranged directly below the tank body. In the present application, a filter medium is separated from leaching residues by means of the partition plates, such that when the leaching residues are discharged by means of an excavating bucket, the filter medium cannot be discharged together therewith by means of the excavating bucket. Moreover, the bottom surface of the tank body is an inclined surface, such that when less extract is generated in the later stage of leaching, it can be ensured that the outflow rate of the extract remains unchanged.

Description

A laterite nickel ore heap leaching system TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrometallurgy, in particular to a laterite nickel ore heap leaching system. BACKGROUND

[0002] Heap leaching is a low-cost hydrometallurgical technology for extracting valuable metals from minerals. For ultra-low-grade laterite nickel ore, heap leaching is currently widely used to extract nickel from mineral materials.

[0003] A laterite nickel ore heap leaching method disclosed in Chinese patent CN102191377A has a filter medium in the heap leaching tank, and a pipe for leaching liquid outflow is arranged at the bottom of the tank. The laterite nickel ore is placed on the filter medium, and sulfuric acid is filtered from top to bottom through the laterite nickel ore layer, and the nickel in the laterite nickel ore is leached out. The leaching liquid flows into the storage tank along the pipe, and the leaching residue is unloaded by artificial or excavating bucket. Since the leaching residue is in direct contact with the filter medium, when the excavating bucket is used to unload the leaching residue, the excavating bucket is easy to unload the filter medium under the leaching residue. In addition, the bottom of the heap leaching tank in the above patent is flat, and the leaching liquid produced in the later stage of leaching is less, resulting in slow outflow of the leaching liquid.

[0004] SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and provide a laterite nickel ore heap leaching system to solve the technical problems that in the prior art, the leaching residue is in direct contact with the filter medium, when the excavating bucket is used to unload the leaching residue, the excavating bucket is easy to unload the filter medium under the leaching residue, and the leaching liquid outflows slowly in the later stage of leaching.

[0006] To achieve the above technical purpose, the technical scheme of the present application provides a laterite nickel ore heap leaching system, comprising:

[0007] At least one heap leaching tank, the heap leaching tank comprises a tank body and two partitions, the bottom surface of the tank body is inclined, the low end side wall of the tank body is provided with an opening, and the two partitions are arranged in the tank body from high to low along the inclined surface to divide the tank body into a heap leaching cavity, a filter cavity and a liquid discharge cavity distributed from high to low along the inclined surface, and a plurality of flow ports are formed in the partitions;

[0008] A storage tank is arranged directly below the tank body and communicates with the opening side of the tank body;

[0009] An acid spraying unit is arranged for spraying sulfuric acid on the laterite nickel ore in the heap leaching cavity.

[0010] Further, the heap leaching tanks are arranged side by side and spaced apart.

[0011] Further, the acid spraying unit comprises an acid storage pool, a plurality of rows of nozzles, an acid conveying pipeline, a first driving pump, a liquid return pipeline and a second driving pump, the acid storage pool is used for storing sulfuric acid, each row of the nozzles is arranged on the side of the corresponding pool body in the length direction of the pool body, the outlet end of each row of the nozzles respectively faces the corresponding heap leaching cavity, one end of the acid conveying pipeline is in communication with the nozzles, the inlet end of the first driving pump is in communication with the acid storage pool, the outlet end of the first driving pump is in communication with the other end of the acid conveying pipeline, and the first driving pump is used for pumping the sulfuric acid in the acid storage pool into the acid conveying pipeline, one end of the liquid return pipeline is in communication with the acid conveying pipeline, the inlet end of the second driving pump is in communication with the liquid storage pool, and the outlet end of the second driving pump is in communication with the other end of the liquid return pipeline, and the second driving pump is used for pumping the leaching liquid in the liquid storage pool into the liquid return pipeline.

[0012] Further, the laterite nickel ore heap leaching system further comprises a feeding unit, the feeding unit is arranged above the pool body and is used for adding laterite nickel ore into the heap leaching cavity.

[0013] Further, the feeding unit comprises a grab bucket and a movement driving mechanism, the grab bucket is arranged above the pool body and is used for grabbing or loosening the laterite nickel ore, and the movement driving mechanism is connected with the grab bucket and is used for driving the grab bucket to move in the length direction, the width direction and the vertical direction of the pool body.

[0014] Further, a side wall of the pool body is provided with a slag discharge port which is in communication with the heap leaching cavity and is closable.

[0015] Further, the laterite nickel ore heap leaching system further comprises a slag discharging unit, the slag discharging unit is arranged at the side of the pool body and is in communication with the slag discharge port, and is used for discharging the leaching slag in the heap leaching cavity.

[0016] Further, the slag discharging unit comprises a slag collecting bucket, a conveying belt and a loader, the slag collecting bucket is arranged below the pool body, the slag collecting bucket has a slag collecting cavity with an open upper surface, the opening of the slag collecting cavity is in communication with the slag discharge port, the bottom of the slag collecting bucket is provided with a slag discharge port which is in communication with the slag collecting cavity, the conveying belt is arranged directly below the slag collecting bucket and is arranged in an inclined manner along the length direction of the pool body, the inlet end of the conveying belt is in communication with the slag discharge port and is used for conveying the leaching slag to a preset position, and the loader is used for shoveling the leaching slag in the heap leaching cavity into the slag collecting cavity along the slag discharge port.

[0017] Further, the laterite nickel ore heap leaching system further comprises an opening and closing unit, the opening and closing unit is arranged at the slag discharge port so as to open or close the slag discharge port.

[0018] Further, the opening and closing unit comprises an opening and closing plate and an opening and closing driving mechanism, the opening and closing plate is arranged at the residue discharging port and is in sliding connection with the pool body, and the opening and closing driving mechanism is connected with the opening and closing plate and is used for driving the opening and closing plate to move up and down so as to open or close the residue discharging port.

[0019] The application has the following advantages: the filter medium is separated from the leaching residue by the partition plate, and the filter medium is not discharged together with the leaching residue when the excavating bucket is used to discharge the leaching residue; meanwhile, the bottom surface of the pool body is inclined, and the outflow rate of the leaching liquid can be ensured when the leaching liquid generated in the later stage of leaching is small. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a perspective structural schematic view of a laterite nickel ore heap leaching system provided by the application;

[0021] Fig. 2 is a perspective structural schematic view of the laterite nickel ore heap leaching system in Fig. 1 from another perspective;

[0022] Fig. 3 is a perspective structural schematic view of the arrangement relationship of a heap leaching pool, a residue discharging unit and an opening and closing unit of the laterite nickel ore heap leaching system in Fig. 2;

[0023] In the figures: 100 - heap leaching pool, 110 - pool body, 111 - heap leaching cavity, 112 - filter cavity, 113 - liquid discharging cavity, 114 - residue discharging port, 120 - partition plate, 121 - overflow port, 200 - liquid storage pool, 300 - acid spraying unit, 310 - acid storage pool, 320 - nozzle, 330 - acid conveying pipeline, 340 - first driving pump, 350 - liquid return pipeline, 360 - second driving pump, 400 - feeding unit, 410 - moving driving mechanism, 500 - residue discharging unit, 510 - residue collecting bucket, 511 - residue collecting cavity, 512 - residue discharging port, 520 - conveying belt, 600 - opening and closing unit, 610 - opening and closing plate, 620 - opening and closing driving mechanism. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0025] The application provides a laterite nickel ore heap leaching system, which has the structure as shown in Figures 1-3, and comprises at least one heap leaching tank 100, a liquid storage tank 200 and an acid spraying unit 300. The heap leaching tank 100 comprises a tank body 110 and two partitions 120. The bottom surface of the tank body 110 is inclined, and the low end side wall of the tank body 110 is provided with an opening. The two partitions 120 are arranged in the tank body 110 in a high-to-low interval along the inclined surface, so as to divide the tank body 110 into a heap leaching cavity 111, a filtering cavity 112 and a liquid discharge cavity 113 distributed from high to low along the inclined surface. A plurality of flow passages 121 are formed in the partitions 120. The liquid storage tank 200 is arranged directly below the tank body 110 and is in communication with the opening side of the tank body 110. The acid spraying unit 300 is used for spraying sulfuric acid to the laterite nickel ore in the heap leaching cavity 111.

[0026] In use, the filtering medium is placed in the filtering cavity 112, the laterite nickel ore is placed in the heap leaching cavity 111, and the acid spraying unit 300 is used for spraying sulfuric acid to the laterite nickel ore in the heap leaching cavity 111. The sulfuric acid is infiltrated through the laterite nickel ore layer from top to bottom, so as to leach the nickel in the laterite nickel ore. After the leaching liquid passes through the filtering medium, the leaching liquid flows into the liquid discharge cavity 113 and then flows into the liquid storage tank 200 along the opening side of the tank body 110. In the embodiment, the filtering medium and the leaching residue are separated by the partitions 120, so that the filtering medium is not discharged together with the leaching residue when the excavator is used to discharge the leaching residue. In addition, the bottom surface of the tank body 110 is inclined, so that the outflow rate of the leaching liquid can be ensured to be constant when the amount of the leaching liquid generated in the later period is small.

[0027] As a preferred embodiment, referring to Figure 1, the heap leaching tanks 100 are arranged side by side and are spaced apart, which is more beautiful and facilitates the arrangement of the liquid storage tank 200 on the low side of the tank body 110, so as to realize the collection of the leaching liquid in the tank body 110.

[0028] As a preferred embodiment, referring to Figure 3, the partitions 120 have a grid structure, and the gaps between the grids form the flow passages 121. The filtering medium is gravel.

[0029] As a preferred embodiment, referring to FIG. 1 and FIG. 2, the acid spraying unit 300 comprises an acid storage pool 310 for storing sulfuric acid, a plurality of rows of nozzles 320, an acid delivery pipeline 330, a first driving pump 340, a liquid return pipeline 350, and a second driving pump 360. Each row of the nozzles is arranged on the side of the corresponding pool body 110 above the length direction of the pool body 110, and the outlet end of each row of the nozzles respectively faces the corresponding heap leaching cavity 111. One end of the acid delivery pipeline 330 is in communication with the nozzles. The inlet end of the first driving pump 340 is in communication with the acid storage pool 310, and the outlet end of the first driving pump 340 is in communication with the other end of the acid delivery pipeline 330, so as to pump the sulfuric acid in the acid storage pool 310 into the acid delivery pipeline 330. One end of the liquid return pipeline 350 is in communication with the acid delivery pipeline 330. The inlet end of the second driving pump 360 is in communication with the liquid storage pool 200, and the outlet end of the second driving pump 360 is in communication with the other end of the liquid return pipeline 350, so as to pump the leaching liquid in the liquid storage pool 200 into the liquid return pipeline 350. When it is needed to spray sulfuric acid on the laterite nickel ore in the heap leaching cavity 111, the first driving pump 340 is started to pump the sulfuric acid in the acid storage pool 310 into the acid delivery pipeline 330. The sulfuric acid in the acid delivery pipeline 330 enters the nozzles and is sprayed out of the nozzles onto the laterite nickel ore. The first driving pump 340 is stopped, and the second driving pump 360 is started to pump the leaching liquid in the liquid storage pool 200 into the liquid return pipeline 350. The leaching liquid in the liquid return pipeline 350 enters the nozzles and is sprayed out of the nozzles onto the laterite nickel ore, so as to realize the cyclic acid leaching of the laterite nickel ore.

[0030] As a preferred embodiment, referring to FIG. 1, the laterite nickel ore heap leaching system further comprises a feeding unit 400 arranged above the pool body 110 and used for adding laterite nickel ore into the heap leaching cavity 111, so as to realize the self-feeding of the laterite nickel ore and avoid manual addition of the laterite nickel ore into the heap leaching cavity 111, thereby saving the labor cost.

[0031] As a preferred embodiment, please refer to Fig. 1, the feeding unit 400 comprises a grab bucket and a moving driving mechanism 410, the grab bucket is arranged above the pool body 110 and is used for grabbing or releasing laterite nickel ore, the moving driving mechanism 410 is connected with the grab bucket and is used for driving the grab bucket to move along the length direction, the width direction and the vertical direction of the pool body 110, by controlling the moving driving mechanism 410, the moving driving mechanism 410 can drive the grab bucket to move along the length direction, the width direction and the vertical direction of the pool body 110, when the grab bucket moves to the position of the laterite nickel ore pile, the grab bucket grabs the laterite nickel ore, when the grab bucket moves to the position directly above the heap leaching cavity 111, the grab bucket releases the laterite nickel ore, and the laterite nickel ore falls into the heap leaching cavity 111, when it is needed to unload the leaching residue in the heap leaching cavity 111, the grab bucket can also be used.

[0032] As a preferred embodiment, the model of the grab bucket is QU0.5-6 cubic.

[0033] As a preferred embodiment, the moving driving mechanism 410 is a gantry crane, which will not be described in detail in the present scheme.

[0034] As a preferred embodiment, please refer to Fig. 2 and Fig. 3, a side wall of the pool body 110 is provided with a residue discharging port 114 which is in communication with the heap leaching cavity 111 and can be closed, when the grab bucket cannot grab the leaching residue in the heap leaching cavity 111, the residue discharging port 114 is opened, and the leaching residue can be discharged through the residue discharging port 114.

[0035] As a preferred embodiment, please refer to Fig. 1 and Fig. 3, the laterite nickel ore heap leaching system further comprises a residue discharging unit 500, the residue discharging unit 500 is arranged at the side of the pool body 110 and is in communication with the residue discharging port 114, and is used for discharging the leaching residue in the heap leaching cavity 111, and the leaching residue in the heap leaching cavity 111 can be discharged along the residue discharging port 114 through the residue discharging unit 500.

[0036] As a preferred embodiment, please refer to FIG. 3, the residue discharging unit 500 comprises a residue collecting bucket 510, a conveying belt 520 and a loader, the residue collecting bucket 510 is arranged below the pool body 110, the residue collecting bucket 510 has a residue collecting cavity 511 with an upper surface being open, the opening of the residue collecting cavity 511 is communicated with the residue discharging port 114, the bottom of the residue collecting bucket 510 is provided with a residue discharging port 512 communicated with the residue collecting cavity 511, the conveying belt 520 is arranged directly below the residue collecting bucket 510 and is arranged obliquely along the length direction of the pool body 110, the inlet end of the conveying belt 520 is communicated with the residue discharging port 512 for conveying the leaching residue to a preset position, the loader is used for shoveling the leaching residue in the heap leaching cavity 111 into the residue collecting cavity 511 along the residue discharging port 114, when the grab bucket cannot grab the leaching residue in the heap leaching cavity 111, the residue discharging port 114 is opened, the leaching residue in the heap leaching cavity 111 is shovelled into the residue collecting cavity 511 along the residue discharging port 114 by the loader, the leaching residue in the residue collecting cavity 511 is discharged along the residue discharging port 512 and falls on the conveying belt 520, and then is conveyed to a preset position by the conveying belt 520, thereby facilitating subsequent processing of the leaching residue and improving the efficiency of residue cleaning.

[0037] As a preferred embodiment, please refer to FIG. 1 and FIG. 3, the laterite nickel ore heap leaching system further comprises an opening and closing unit 600, the opening and closing unit 600 is arranged at the residue discharging port 114 to open or close the residue discharging port 114, when the residue discharging port 114 is opened, the leaching residue in the heap leaching cavity 111 can be discharged through the residue discharging port 114, and when the residue discharging port 114 is closed, leaching operation can be performed in the heap leaching cavity 111.

[0038] As a preferred embodiment, please refer to FIG. 3, the opening and closing unit 600 comprises an opening and closing plate 610 and an opening and closing driving mechanism 620, the opening and closing plate 610 is arranged at the residue discharging port 114 and is slidably connected with the pool body 110, the opening and closing driving mechanism 620 is connected with the opening and closing plate 610 and is used for driving the opening and closing plate 610 to move up and down to open or close the residue discharging port 114, when it is needed to open the residue discharging port 114, the opening and closing driving mechanism 620 is controlled to drive the opening and closing plate 610 to move upward to a preset position, at this time, the residue discharging port 114 is opened, when it is needed to close the residue discharging port 114, the opening and closing driving mechanism 620 is controlled to drive the opening and closing plate 610 to move downward until the bottom of the opening and closing plate 610 abuts against the bottom surface of the pool body 110, at this time, the residue discharging port 114 is closed.

[0039] As a preferred embodiment, the opening and closing driving mechanism 620 is a closing machine.

[0040] In order to better understand the present application, the working principle of the technical solutions of the present application is described in detail below in combination with Figures 1-3:

[0041] In use, the filter medium is placed in the filter cavity 112. By operating the gantry crane, the gantry crane can drive the grab bucket to move along the length direction, width direction and vertical direction of the pool body 110. When the grab bucket moves to the position of the laterite nickel ore pile, the grab bucket grabs the laterite nickel ore. When the grab bucket moves to the position directly above the heap leaching cavity 111, the grab bucket releases the laterite nickel ore, and the laterite nickel ore falls into the heap leaching cavity 111. The first driving pump 340 is opened, and the first driving pump 340 pumps the sulfuric acid in the acid storage pool 310 into the acid conveying pipeline 330. The sulfuric acid in the acid conveying pipeline 330 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle. The sulfuric acid infiltrates through the laterite nickel ore layer from top to bottom, leaching the nickel in the laterite nickel ore. After the leaching solution passes through the filter medium, it flows into the liquid discharge cavity 113 and then flows into the liquid storage pool 200 along the open side of the pool body 110. The first driving pump 340 is closed, and the second driving pump 360 is opened. The second driving pump 360 pumps the leaching solution in the liquid storage pool 200 into the liquid return pipeline 350. The leaching solution in the liquid return pipeline 350 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle, achieving the cyclic acid leaching of the laterite nickel ore. After the acid leaching is completed, the grab bucket can be used to unload the leaching residue in the heap leaching cavity 111. When the grab bucket cannot grab the leaching residue in the heap leaching cavity 111, the residue discharge port 114 is opened, and the loader is used to shovel the leaching residue in the heap leaching cavity 111 along the residue discharge port 114 into the residue collecting cavity 511. The leaching residue in the residue collecting cavity 511 is discharged along the residue discharge port 512 and falls onto the conveyor belt 520, which then conveys the leaching residue to a predetermined position. In the present laterite nickel ore heap leaching system, the filter medium and the leaching residue are separated by the partition plate 120. Therefore, when the excavator bucket is used to unload the leaching residue, the excavator bucket will not unload the filter medium together. In addition, the bottom surface of the pool body 110 is inclined. When the amount of leaching solution generated in the later stage is small, the outflow rate of the leaching solution can be ensured to be constant.

[0042] The laterite nickel ore heap leaching system provided by the present application has the following beneficial effects:

[0043] (1) The second driving pump 360 pumps the leaching solution in the liquid storage pool 200 into the liquid return pipeline 350. The leaching solution in the liquid return pipeline 350 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle, achieving the cyclic acid leaching of the laterite nickel ore.

[0044] (2) The leaching residue in the heap leaching cavity 111 can be unloaded by the grab bucket. When the grab bucket cannot grab the leaching residue in the heap leaching cavity 111, the residue discharge port 114 is opened, the leaching residue in the heap leaching cavity 111 is scooped into the residue collecting cavity 511 along the residue discharge port 114 by the loader, the leaching residue in the residue collecting cavity 511 is discharged along the residue discharge port 512 and falls on the conveying belt 520, and then is conveyed to a preset position by the conveying belt 520, thereby improving the efficiency of slag cleaning;

[0045] (3) In the later stage of the heap leaching system for lateritic nickel ore, the filter medium is separated from the leaching residue by the partition plate 120, so that the filter medium is not unloaded together with the leaching residue when the excavator bucket is used to unload the leaching residue. In addition, the bottom surface of the pool body 110 is the inclined surface, so that the outflow rate of the leaching solution can be ensured to be constant when the leaching solution generated in the later stage is small.

[0046] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A laterite nickel ore heap leaching system characterized in that, The application relates to a heap leaching tank. The heap leaching tank comprises at least one heap leaching tank, a pool body and two partitions, the bottom surface of the pool body is inclined, the low end side wall of the pool body is provided with an opening, and the two partitions are arranged in the pool body in a high-to-low interval along the inclined surface to separate a heap leaching cavity, a filtering cavity and a liquid discharge cavity distributed from high to low along the inclined surface in the pool body, and a plurality of flow ports are formed in the partitions. A liquid storage pool is arranged below the pool body and communicates with the opening side of the pool body. An acid spraying unit is arranged for spraying sulfuric acid on laterite nickel ore in the heap leaching cavity.

2. The nickel laterite heap leaching system according to claim 1, characterized in that, The heap leaching tanks are arranged side by side and are spaced apart.

3. The nickel laterite heap leaching system according to claim 1, characterized in that, The acid spraying unit comprises an acid storage pool, a plurality of rows of nozzles, an acid conveying pipeline, a first driving pump, a liquid return pipeline and a second driving pump, the acid storage pool is used for storing sulfuric acid, each row of nozzles is arranged on the upper side of the corresponding pool body in a length direction interval of the pool body, the outlet ends of each row of nozzles respectively face the corresponding heap leaching cavity, one end of the acid conveying pipeline communicates with the nozzles, the inlet end of the first driving pump communicates with the acid storage pool, the outlet end of the first driving pump communicates with the other end of the acid conveying pipeline, the first driving pump is used for pumping the sulfuric acid in the acid storage pool into the acid conveying pipeline, one end of the liquid return pipeline communicates with the acid conveying pipeline, the inlet end of the second driving pump communicates with the liquid storage pool, and the outlet end of the second driving pump communicates with the other end of the liquid return pipeline, so that the second driving pump is used for pumping the leaching liquid in the liquid storage pool into the liquid return pipeline.

4. The nickel laterite heap leaching system according to claim 1, characterized in that, The application further comprises a feeding unit arranged above the pool body and used for adding laterite nickel ore into the heap leaching cavity.

5. The nickel laterite heap leaching system according to claim 4, wherein, The feeding unit comprises a grab bucket arranged above the pool body and used for grabbing or loosening laterite nickel ore, and a movement driving mechanism connected with the grab bucket and used for driving the grab bucket to move in a length direction, a width direction and a vertical direction of the pool body.

6. The nickel laterite heap leaching system according to claim 1, wherein, An outlet for discharging slag is arranged on one side wall of the pool body and communicates with the heap leaching cavity and can be closed.

7. The nickel laterite heap leaching system according to claim 6, characterized in that, The application further comprises a slag discharging unit arranged on the side of the pool body and communicating with the outlet for discharging slag and used for discharging leaching slag in the heap leaching cavity.

8. The nickel laterite heap leaching system according to claim 7, characterized in that, The slag discharging unit comprises a slag collecting bucket, a conveying belt and a loader, the slag collecting bucket is arranged below the pool body, the slag collecting bucket has a slag collecting cavity with an open upper surface, the opening of the slag collecting cavity communicates with the outlet for discharging slag, a slag discharging outlet communicating with the slag collecting cavity is arranged on the bottom of the slag collecting bucket, the conveying belt is arranged below the slag collecting bucket and is arranged in a length direction of the pool body, the inlet end of the conveying belt communicates with the slag discharging outlet and is used for conveying leaching slag to a preset position, and the loader is used for shoveling leaching slag in the heap leaching cavity into the slag collecting cavity through the outlet for discharging slag.

9. The nickel laterite heap leaching system according to claim 6, characterized in that, The application further comprises an opening and closing unit arranged at the outlet for discharging slag to open or close the outlet for discharging slag.

10. The nickel laterite heap leaching system according to claim 9, wherein, The opening and closing unit comprises an opening and closing plate and an opening and closing driving mechanism, the opening and closing plate is arranged at the slag discharge port and is in sliding connection with the pool body, and the opening and closing driving mechanism is connected with the opening and closing plate and is used for driving the opening and closing plate to move up and down so as to open or close the slag discharge port.

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