Laterite nickel ore dump leaching system

Abstract

The laterite nickel ore dump leaching system comprises at least one dump leaching pool, a liquid storage pool and an acid spraying unit, the dump leaching pool comprises a pool body and two partition plates, the bottom face of the pool body is an inclined face, the side wall of the lower end of the pool body is provided with an opening, the two partition plates are arranged in the pool body at intervals from high to low along the inclined face, and the liquid storage pool is arranged in the pool body. The tank body is internally divided into a heap leaching cavity, a filtering cavity and a liquid discharging cavity which are distributed from high to low along the inclined surface, and a plurality of overflowing openings are formed in the partition plate; and the liquid storage tank is arranged right below the tank body. The filter medium and the leaching residues are separated through the partition plate, and when the leaching residues are discharged through the excavator bucket, the excavator bucket does not discharge the filter medium together with the leaching residues; and meanwhile, the bottom surface of the tank body is an inclined surface, so that when a small amount of leachate is generated in the later leaching period, the outflow rate of the leachate can be kept unchanged.

Description

Technical Field

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

[0002] Heap leaching is a hydrometallurgical technique for extracting valuable metals from minerals at low cost. Heap leaching is currently the most common method used to extract nickel from ultra-low-grade laterite nickel ores.

[0003] Chinese patent CN102191377A discloses a heap leaching method for laterite nickel ore. The heap leaching tank is equipped with a filter medium and a pipe for leachate discharge at the bottom. The laterite nickel ore is placed on the filter medium, and sulfuric acid percolates through the laterite nickel ore layer from top to bottom, leaching the nickel from the laterite nickel ore. The leachate flows along the pipe into a reservoir, and the leached residue is discharged manually or with a bucket. Because the leached residue is in direct contact with the filter medium, the bucket easily removes the filter medium below the leached residue when unloading the residue with a bucket. Furthermore, the bottom of the heap leaching tank in the aforementioned patent is flat, resulting in less leachate produced in the later stages of leaching, resulting in a slower leachate discharge. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a laterite nickel ore heap leaching system to solve the technical problems in traditional technology that the leaching residue is in direct contact with the filter medium, when the leaching residue is unloaded by an excavator bucket, the excavator bucket is likely to unload the filter medium under the leaching residue, and the leachate flows out relatively slowly in the later stage of leaching.

[0005] To achieve the above technical objectives, the technical solution of the present application provides a laterite nickel ore heap leaching system, comprising:

[0006] At least one heap leaching tank, the heap leaching tank comprising a tank body and two partitions, the bottom surface of the tank body being an inclined surface, the lower end sidewall of the tank body being an opening, the two partitions being spaced apart in the tank body along the inclined surface from high to low, so as to separate the heap leaching chamber, the filtration chamber, and the drainage chamber distributed along the inclined surface from high to low in the tank body, and the partitions being provided with a plurality of flow openings;

[0007] A liquid storage tank is provided directly below the tank body and is in communication with the opening side of the tank body;

[0008] The acid spraying unit is used to spray sulfuric acid onto the laterite nickel ore in the heap leaching chamber.

[0009] Furthermore, the heap leaching tanks are arranged side by side and at intervals.

[0010] Furthermore, the acid injection unit includes an acid storage tank, multiple rows of nozzles, an acid delivery pipeline, a first driving pump, a liquid return pipeline and a second driving pump. The acid storage tank is used to store sulfuric acid. Each row of nozzles is spaced apart along the longitudinal direction of the tank body and arranged on the upper side of the corresponding tank body. The outlet end of each row of nozzles faces the corresponding heap leaching chamber. One end of the acid delivery pipeline is connected to the nozzles. The inlet end of the first driving pump is connected to the acid storage tank, and the outlet end of the first driving pump is connected to the other end of the acid delivery pipeline, so as to pump the sulfuric acid in the acid storage tank into the acid delivery pipeline. One end of the liquid return pipeline is connected to the acid delivery pipeline, the inlet end of the second driving pump is connected to the liquid storage tank, and the outlet end of the second driving pump is connected to the other end of the liquid return pipeline, so as to pump the leachate in the liquid storage tank into the liquid return pipeline.

[0011] Furthermore, the laterite nickel ore heap leaching system further includes a feeding unit, which is arranged above the pool body and is used to add laterite nickel ore into the heap leaching chamber.

[0012] Furthermore, the loading unit includes a grab bucket and a mobile drive mechanism. The grab bucket is arranged above the pool body and is used to grab or loosen the laterite nickel ore. The mobile drive mechanism is connected to the grab bucket and is used to drive the grab bucket to move along the length, width and vertical directions of the pool body.

[0013] Furthermore, a closable slag discharge port communicating with the heap leaching chamber is provided on one side wall of the pool body.

[0014] Furthermore, the laterite nickel ore heap leaching system further includes a slag discharge unit, which is arranged on the side of the pool body and connected to the slag discharge port for discharging leached slag in the heap leaching chamber.

[0015] Furthermore, the slag discharge unit includes a slag collecting hopper, a conveyor belt and a loader. The slag collecting hopper is arranged below the pool body. The slag collecting hopper has a slag collecting cavity with an opening on the upper surface. The opening of the slag collecting cavity is connected with the slag discharge port. The bottom of the slag collecting hopper is provided with a slag discharge port connected with the slag collecting cavity. The conveyor belt is arranged directly below the slag collecting hopper and is inclined along the length direction of the pool body. The inlet end of the conveyor belt is connected with the slag discharge port for conveying the leached slag to a preset position. The loader is used to shovel the leached slag in the heap leaching cavity into the slag collecting cavity along the slag discharge port.

[0016] Furthermore, the laterite nickel ore heap leaching system further includes an opening and closing unit, which is arranged at the slag discharge port to open or close the slag discharge port.

[0017] Furthermore, the opening and closing unit includes an opening and closing plate and an opening and closing drive mechanism. The opening and closing plate is arranged at the slag discharge port and is slidingly connected to the pool body. The opening and closing drive mechanism is connected to the opening and closing plate and is used to drive the opening and closing plate to move up and down to open or close the slag discharge port.

[0018] The beneficial effects of the present application are as follows: the present application separates the filter medium from the leaching residue through a partition. When the leaching residue is unloaded using an excavator bucket, the excavator bucket will not unload the filter medium together. At the same time, the bottom surface of the pool body is an inclined surface. When the leachate generated in the later stage of leaching is less, the outflow rate of the leachate can be guaranteed to remain unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a laterite nickel ore heap leaching system provided by the present application;

[0020] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a laterite nickel ore heap leaching system from another perspective;

[0021] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure of the arrangement relationship of the heap leaching tank, the slag discharge unit and the opening and closing unit of a laterite nickel ore heap leaching system;

[0022] In the figure: 100 - heap leaching tank, 110 - tank body, 111 - heap leaching chamber, 112 - filter chamber, 113 - drainage chamber, 114 - slag discharge port, 120 - partition, 121 - overflow port, 200 - liquid storage tank, 300 - acid spray unit, 310 - acid storage tank, 320 - nozzle, 330 - acid transmission pipeline, 340 - first driving pump, 350 - liquid return pipeline, 360 - second driving pump, 400 - feeding unit, 410 - mobile driving mechanism, 500 - slag discharge unit, 510 - slag collecting hopper, 511 - slag collecting chamber, 512 - slag discharge port, 520 - conveyor belt, 600 - opening and closing unit, 610 - opening and closing plate, 620 - opening and closing driving mechanism. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] The present application provides a laterite nickel ore heap leaching system, the structure of which is as follows: Figure 1 - Figure 3As shown, it includes at least one heap leaching tank 100, a liquid storage tank 200 and an acid spraying unit 300. The heap leaching tank 100 includes a tank body 110 and two partitions 120. The bottom surface of the tank body 110 is an inclined surface, and the lower end side wall of the tank body 110 is open. The two partitions 120 are arranged in the tank body 110 from high to low along the inclined surface to separate the heap leaching chamber 111, the filter chamber 112 and the drainage chamber 113 distributed from high to low along the inclined surface in the tank body 110. The partitions 120 are provided with multiple flow ports 121; the liquid storage tank 200 is arranged directly below the tank body 110 and is connected to the open side of the tank body 110; the acid spraying unit 300 is used to spray sulfuric acid onto the laterite nickel ore in the heap leaching chamber 111.

[0025] During use, a filter medium is placed in the filter chamber 112, and laterite nickel ore is placed in the heap leaching chamber 111. Sulfuric acid is sprayed onto the laterite nickel ore in the heap leaching chamber 111 through the acid spraying unit 300. The sulfuric acid percolates through the laterite nickel ore layer from top to bottom, leaching nickel in the laterite nickel ore. After passing through the filter medium, the leachate flows into the drainage chamber 113 and flows into the liquid storage tank 200 along the open side of the tank body 110. In this embodiment, since the filter medium and the leached residue are separated by the partition 120, when the leached residue is unloaded using an excavator bucket, the excavator bucket will not unload the filter medium together. In addition, the bottom surface of the tank body 110 is the inclined surface. When the leachate generated in the later stage of leaching is less, the outflow rate of the leachate can be guaranteed to remain unchanged.

[0026] As a preferred embodiment, please refer to Figure 1 The heap leaching tanks 100 are arranged side by side and at intervals, which is more beautiful and also facilitates the arrangement of the liquid storage tank 200 on the lower side of the tank body 110 to collect the leachate in the tank body 110 .

[0027] As a preferred embodiment, please refer to Figure 3 The partition 120 is a grid structure, the gaps between the grids form the flow opening 121, and the filter medium is gravel.

[0028] As a preferred embodiment, please refer to Figure 1 and Figure 2The acid injection unit 300 includes an acid storage tank 310, multiple 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. The acid storage tank 310 is used to store sulfuric acid. The nozzles in each row are spaced apart along the length direction of the tank body 110 at the upper side of the corresponding tank body 110. The outlet end of each row of nozzles faces the corresponding heap leaching chamber 111. One end of the acid delivery pipeline 330 is connected to the nozzles. The inlet end of the first driving pump 340 is connected to the acid storage tank 310. The outlet end of the first driving pump 340 is connected to the other end of the acid delivery pipeline 330 for pumping sulfuric acid in the acid storage tank 310 into the acid delivery pipeline 330. One end of the liquid return pipeline 350 is connected to the acid delivery pipeline 330. The inlet end of the second driving pump 360 is connected to the The first driving pump 340 is connected to the liquid storage tank 200, and the outlet end of the second driving pump 360 is connected to the other end of the liquid return pipeline 350, and is used to pump the leachate in the liquid storage tank 200 into the liquid return pipeline 350. When it is necessary to spray sulfuric acid onto the laterite nickel ore in the heap leaching chamber 111, the first driving pump 340 is turned on, and the first driving pump 340 pumps the sulfuric acid in the acid storage tank 310 into the acid delivery pipeline 330. The sulfuric acid in the acid delivery pipeline 330 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle. The first driving pump 340 is turned off, and the second driving pump 360 is turned on. The second driving pump 360 pumps the leachate in the liquid storage tank 200 into the liquid return pipeline 350. The leachate in the liquid return pipeline 350 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle, thereby realizing cyclic acid leaching of the laterite nickel ore.

[0029] As a preferred embodiment, please refer to Figure 1 The laterite nickel ore heap leaching system further includes a loading unit 400, which is arranged above the pool body 110 and is used to add laterite nickel ore into the heap leaching chamber 111. This can realize self-loading of laterite nickel ore, avoid manual addition of laterite nickel ore into the heap leaching chamber 111, and save labor costs.

[0030] As a preferred embodiment, please refer to Figure 1The loading unit 400 includes a grab bucket and a mobile drive mechanism 410. The grab bucket is arranged above the pool body 110 and is used to grab or loosen the laterite nickel ore. The mobile drive mechanism 410 is connected to the grab bucket and is used to drive the grab bucket to move along the length, width and vertical directions of the pool body 110. By manipulating the mobile drive mechanism 410, the mobile drive mechanism 410 can drive the grab bucket to move along the length, width and vertical directions of the pool body 110. When the grab bucket moves to the laterite nickel ore pile, the grab bucket grabs the laterite nickel ore. When the grab bucket moves to the top of the heap leaching chamber 111, the grab bucket loosens the laterite nickel ore, and the laterite nickel ore falls into the heap leaching chamber 111. When the leaching slag in the heap leaching chamber 111 needs to be unloaded, it can also be achieved through the grab bucket.

[0031] As a preferred embodiment, the grab bucket has a model of QU0.5-6 cubic meters.

[0032] As a preferred embodiment, the mobile driving mechanism 410 is a gantry crane, which will not be described in detail in this solution.

[0033] As a preferred embodiment, please refer to Figure 2 and Figure 3 A slag discharge port 114 is provided on one side wall of the pool body 110 and is connected to the heap leaching chamber 111 and can be closed. When the grab bucket cannot grab the leached slag in the heap leaching chamber 111, the slag discharge port 114 is opened and the leached slag can be discharged through the slag discharge port 114.

[0034] As a preferred embodiment, please refer to Figure 1 and Figure 3 The laterite nickel ore heap leaching system further includes a slag discharge unit 500, which is arranged on the side of the pool body 110 and is connected to the slag discharge port 114, and is used to discharge the leached slag in the heap leaching chamber 111. The leached slag in the heap leaching chamber 111 can be discharged along the slag discharge port 114 through the slag discharge unit 500.

[0035] As a preferred embodiment, please refer to Figure 3The slag discharge unit 500 includes a slag collecting hopper 510, a conveyor belt 520 and a loader. The slag collecting hopper 510 is arranged below the tank body 110. The slag collecting hopper 510 has a slag collecting cavity 511 with an opening on the upper surface. The opening of the slag collecting cavity 511 is connected to the slag discharge port 114. The bottom of the slag collecting hopper 510 is provided with a slag outlet 512 connected to the slag collecting cavity 511. The conveyor belt 520 is arranged just below the slag collecting hopper 510 and is inclined along the length direction of the tank body 110. The inlet end of the conveyor belt 520 is connected to the slag outlet 512 for leaching the slag. The loader is used to shovel the leached slag in the heap leaching chamber 111 into the slag collecting chamber 511 along the slag discharge port 114 when the grab bucket cannot grab the leached slag in the heap leaching chamber 111, the slag discharge port 114 is opened, and the loader shovels the leached slag in the heap leaching chamber 111 into the slag collecting chamber 511 along the slag discharge port 114. The leached slag in the slag collecting chamber 511 is discharged along the slag discharge port 512 and falls onto the conveyor belt 520, and then transported to the preset position via the conveyor belt 520, which is convenient for people to carry out subsequent processing of the leached slag and improves the efficiency of slag cleaning.

[0036] As a preferred embodiment, please refer to Figure 1 and Figure 3 The laterite nickel ore heap leaching system further includes an opening and closing unit 600, which is arranged at the slag discharge port 114 to open or close the slag discharge port 114. When the slag discharge port 114 is opened, the leached slag in the heap leaching chamber 111 can be discharged through the slag discharge port 114. When the slag discharge port 114 is closed, leaching operations can be carried out in the heap leaching chamber 111.

[0037] As a preferred embodiment, please refer to Figure 3 The opening and closing unit 600 includes an opening and closing plate 610 and an opening and closing drive mechanism 620. The opening and closing plate 610 is arranged at the slag discharge port 114 and is slidably connected to the pool body 110. The opening and closing drive mechanism 620 is connected to the opening and closing plate 610 for driving the opening and closing plate 610 to move up and down so that the slag discharge port 114 is opened or closed. When the slag discharge port 114 needs to be opened, the opening and closing drive mechanism 620 is operated so that the opening and closing drive mechanism 620 can drive the opening and closing plate 610 to move upward to a preset position. At this time, the slag discharge port 114 is opened. When the slag discharge port 114 needs to be closed, the opening and closing drive mechanism 620 is operated so that the opening and closing drive mechanism 620 can 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 slag discharge port 114 is closed.

[0038] As a preferred embodiment, the opening and closing drive mechanism 620 is a hoist.

[0039] In order to better understand this application, the following Figure 1 - Figure 3 The working principle of the technical solution of this application is described in detail:

[0040] During use, a filter medium is placed in the filter chamber 112, and the gantry crane is controlled so that the gantry crane can drive the grab bucket to move along the length, width and vertical directions of the pool body 110. When the grab bucket moves to the laterite nickel ore pile, the grab bucket grabs the laterite nickel ore. When the grab bucket moves to the top of the heap leaching chamber 111, the grab bucket releases the laterite nickel ore, and the laterite nickel ore falls into the heap leaching chamber 111. The first driving pump 340 is turned on, and the first driving pump 340 drives the The sulfuric acid in the acid storage tank 310 is pumped into the acid delivery pipeline 330, and the sulfuric acid in the acid delivery pipeline 330 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle. The sulfuric acid percolates through the laterite nickel ore layer from top to bottom, leaching the nickel in the laterite nickel ore. After passing through the filter medium, the leachate flows into the drainage cavity 113 and flows into the liquid storage tank 200 along the open side of the tank body 110. The first driving pump 340 is turned off and the second driving pump 360 is turned on. The second driving pump 360 pumps the The leachate in the liquid storage tank 200 is pumped into the liquid return pipe 350, and the leachate in the liquid return pipe 350 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle to realize the circulating acid leaching of the laterite nickel ore. After the acid leaching is completed, the leached slag in the heap leaching chamber 111 can be discharged by the grab bucket. When the grab bucket cannot grab the leached slag in the heap leaching chamber 111, the slag discharge port 114 is opened, and the loader shovels the leached slag in the heap leaching chamber 111 along the slag discharge port 114 into the collecting slag. In the slag cavity 511, the leached slag in the slag collecting cavity 511 is discharged along the slag outlet 512 and falls onto the conveyor belt 520, and then transported to a preset position via the conveyor belt 520. In the present laterite nickel ore heap leaching system, since the filter medium and the leached slag are separated by the partition 120, when the leached slag is unloaded using an excavator bucket, the excavator bucket will not unload the filter medium together. In addition, the bottom surface of the tank body 110 is the inclined surface, and when the leachate generated in the later stage of leaching is less, the outflow rate of the leachate can be guaranteed to remain unchanged.

[0041] The laterite nickel ore heap leaching system provided in this application has the following beneficial effects:

[0042] (1) The second driving pump 360 pumps the leachate in the liquid storage tank 200 into the liquid return pipeline 350. The leachate in the liquid return pipeline 350 enters the nozzle and is sprayed onto the laterite nickel ore by the nozzle, thereby realizing the circulating acid leaching of the laterite nickel ore.

[0043] (2) The leached slag in the heap leaching chamber 111 can be discharged by the grab bucket. When the grab bucket cannot grab the leached slag in the heap leaching chamber 111, the slag discharge port 114 is opened, and the leached slag in the heap leaching chamber 111 is shoveled into the slag collecting chamber 511 along the slag discharge port 114 by the loader. The leached slag in the slag collecting chamber 511 is discharged along the slag discharge port 512 and falls onto the conveyor belt 520, and then transported to a preset position via the conveyor belt 520, thereby improving the efficiency of slag cleaning;

[0044] (3) In the present laterite nickel ore heap leaching system, since the filter medium and the leaching residue are separated by the partition 120, when the leaching residue is unloaded by the excavator bucket, the excavator bucket will not unload the filter medium together. In addition, the bottom surface of the tank body 110 is the inclined surface. When the leachate generated in the later stage of leaching is less, the outflow rate of the leachate can be guaranteed to remain unchanged.

[0045] The specific implementation methods of the present application described above do not limit the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A laterite nickel ore heap leaching system, characterized in that: include: At least one heap leaching tank, the heap leaching tank comprising a tank body and two partitions, the bottom surface of the tank body being an inclined surface, the lower end sidewall of the tank body being an opening, the two partitions being spaced apart in the tank body along the inclined surface from high to low, so as to separate the heap leaching chamber, the filtration chamber, and the drainage chamber distributed along the inclined surface from high to low in the tank body, and the partitions being provided with a plurality of flow openings; A liquid storage tank is provided directly below the tank body and is in communication with the opening side of the tank body; The acid spraying unit is used to spray sulfuric acid onto the laterite nickel ore in the heap leaching chamber.

2. The laterite nickel ore heap leaching system according to claim 1, characterized in that: The heap leaching tanks are arranged side by side and at intervals.

3. The laterite nickel ore heap leaching system according to claim 1, characterized in that: The acid injection unit includes an acid storage tank, multiple rows of nozzles, an acid delivery pipeline, a first driving pump, a liquid return pipeline and a second driving pump. The acid storage tank is used to store sulfuric acid. The nozzles in each row are spaced apart along the longitudinal direction of the tank body and arranged on the upper side of the corresponding tank body. The outlet end of each row of nozzles faces the corresponding heap leaching chamber. One end of the acid delivery pipeline is connected to the nozzles. The inlet end of the first driving pump is connected to the acid storage tank, and the outlet end of the first driving pump is connected to the other end of the acid delivery pipeline for pumping sulfuric acid in the acid storage tank into the acid delivery pipeline. One end of the liquid return pipeline is connected to the acid delivery pipeline. The inlet end of the second driving pump is connected to the liquid storage tank, and the outlet end of the second driving pump is connected to the other end of the liquid return pipeline for pumping leachate in the liquid storage tank into the liquid return pipeline.

4. The laterite nickel ore heap leaching system according to claim 1, characterized in that: It also includes a loading unit, which is arranged above the pool body and is used to add laterite nickel ore into the heap leaching chamber.

5. The laterite nickel ore heap leaching system according to claim 4, characterized in that: The loading unit includes a grab bucket and a mobile drive mechanism. The grab bucket is arranged above the pool body and is used to grab or loosen the laterite nickel ore. The mobile drive mechanism is connected to the grab bucket and is used to drive the grab bucket to move along the length, width and vertical directions of the pool body.

6. The laterite nickel ore heap leaching system according to claim 1, characterized in that: A slag discharge port which is communicated with the heap leaching chamber and can be closed is provided on one side wall of the pool body.

7. The laterite nickel ore heap leaching system according to claim 6, characterized in that: It also includes a slag discharge unit, which is arranged on the side of the pool body and is connected to the slag discharge port for discharging the leached slag in the heap leaching chamber.

8. The laterite nickel ore heap leaching system according to claim 7, characterized in that: The slag discharge unit includes a slag collecting hopper, a conveyor belt and a loader. The slag collecting hopper is arranged below the pool body. The slag collecting hopper has a slag collecting cavity with an opening on the upper surface. The opening of the slag collecting cavity is connected with the slag discharge port. The bottom of the slag collecting hopper is provided with a slag discharge port connected with the slag collecting cavity. The conveyor belt is arranged directly below the slag collecting hopper and is inclined along the length direction of the pool body. The inlet end of the conveyor belt is connected with the slag discharge port for conveying the leached slag to a preset position. The loader is used to shovel the leached slag in the heap leaching cavity into the slag collecting cavity along the slag discharge port.

9. The laterite nickel ore heap leaching system according to claim 6, characterized in that: It also includes an opening and closing unit, which is arranged at the slag discharge port to open or close the slag discharge port.

10. The laterite nickel ore heap leaching system according to claim 9, characterized in that: The opening and closing unit includes an opening and closing plate and an opening and closing drive mechanism. The opening and closing plate is arranged at the slag discharge port and is slidably connected to the pool body. The opening and closing drive mechanism is connected to the opening and closing plate and is used to drive the opening and closing plate to move up and down to open or close the slag discharge port.

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