Device system for extracting lithium from salt lake by extraction method

Abstract

The invention relates to a device system for extracting lithium from a salt lake by an extraction method, the device system comprises a first plane, a second plane and a third plane which are sequentially arranged from top to bottom, the first plane is provided with a main body treatment system, the second plane is provided with a pipeline integration system, and the third plane is provided with an auxiliary tank body; the main body treatment system comprises an extraction-washing-reverse extraction module, and an extraction section, a washing section and a reverse extraction section in the extraction-washing-reverse extraction module are sequentially communicated in the flowing direction of an extraction agent; the auxiliary tank body comprises a residual water oil separation tank and an emergency transfer tank, and the auxiliary tank body is connected with the extraction-washing-reverse extraction module through a pipeline; and the pipeline is integrated on a pipeline integration system of a second plane. According to the device system provided by the invention, the main body treatment system, the pipeline integration system and the auxiliary tank body are arranged in a layered manner, so that maintenance and troubleshooting can be facilitated, the liquid leakage problem is solved in time, and the operation stability and safety are improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium extraction from salt lakes, and in particular to a device system for extracting lithium from salt lakes using an extraction method. Background Art

[0002] With the increasing demand for lithium resources, lithium extraction technology has become the focus of current development. Existing lithium extraction systems include lithium battery recovery extraction and salt lake extraction. The lithium concentration of lithium battery recovery extraction is relatively high, generally 20-30g / L, and the volume and number of extraction tanks are relatively small; the lithium concentration of salt lake extraction is relatively low, generally 0.1-3g / L. Under the same output, the number or volume of extraction tanks required for lithium extraction from salt lakes is much greater than that of lithium battery recovery extraction.

[0003] The existing lithium battery extraction system generally sets the tank body on the ground. In the process of extracting lithium from salt lakes, the number of extraction tanks increases, the volume of extraction tanks increases, and leakage is prone to occur. Salt lake brine is alkaline as a whole. Compared with the acidic raw solution of acid leaching in battery recovery, the alkaline liquid is more likely to cause slow phase separation and emulsification. In the actual production process, leakage and frequent transfer of extractants are prone to occur, resulting in increased operating costs and reduced production efficiency.

[0004] For example, CN106119575A discloses a process for extracting lithium from salt lake brine using a box-type extraction tank, which includes five main stages: extraction, washing, stripping, saponification, and acid washing, taking advantage of the low cost of the box-type extraction tank. However, in the actual process, more equipment is required to achieve multi-stage extraction, which increases the difficulty of maintenance and management, and there is a risk of leakage in long-term operation, which is inconvenient to maintain and maintain.

[0005] In the process of extracting lithium from salt lakes by extraction, due to the large volume of extracted brine, high brine saturation, and high extraction tank capacity, the extraction tank and pipelines are prone to crystallization and leakage, making it difficult to repair and clean the extraction tank in time. At the same time, due to the large volume of brine, it takes a long time for the brine and the organic phase to completely separate, resulting in low extraction efficiency. Therefore, a device system capable of extracting lithium from salt lakes by extraction is provided. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device system for extracting lithium from salt lakes by the extraction method. Compared with the prior art, the device system provided by the present invention can facilitate maintenance and troubleshooting by layering the main processing system, pipeline integration system and auxiliary tank body, and can deal with leakage problems in time, thereby improving the stability and safety of operation.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] The present invention provides a device system for extracting lithium from salt lakes by an extraction method, the device system comprising a first plane, a second plane and a third plane arranged in sequence from top to bottom, the first plane being provided with a main processing system, the second plane being provided with a pipeline integration system, and the third plane being provided with an auxiliary tank body;

[0009] The main treatment system comprises an extraction-washing-stripping module, in which an extraction section, a washing section and a stripping section are sequentially connected along the flow direction of the extractant;

[0010] The auxiliary tank body includes a residual water oil separator tank and an emergency transfer tank, and the auxiliary tank body is connected to the extraction-washing-stripping module through a pipeline;

[0011] The pipeline is integrated into the pipeline integration system of the second plane.

[0012] In the device system provided by the present invention, the main processing system is mainly used for extracting lithium-rich solution by extraction, washing and stripping, and is arranged on the first plane to facilitate centralized management and monitoring by operators; the auxiliary tank body is mainly used for temporarily storing or processing the feed liquid, and is arranged on the third plane (the first plane, the second plane and the third plane are arranged in sequence from top to bottom, and the third plane generally refers to the ground) to avoid mutual interference with the main processing system; the connecting pipelines of the extraction-washing-stripping module and the auxiliary tank body are integrated on the second plane to facilitate maintenance and overhaul, reduce the impact of maintenance work on normal operations, and in the event of an emergency, can quickly resolve the emergency by controlling the pipeline switch, and optimize the structural layout to improve the utilization of space.

[0013] Preferably, the outlet of the raffinate in the extraction section is connected to the residual water oil separator through a pipeline; the pipeline is integrated into the pipeline integration system of the second plane.

[0014] Preferably, the device system also includes an impurity removal module; the impurity removal module is arranged on the third plane; the impurity removal module includes a brine storage tank, a plate and frame filter press unit and a filtrate storage tank connected in sequence along the flow direction of the feed liquid; the outlet of the filtrate storage tank is connected to the water phase inlet of the extraction section in the extraction-washing-strip extraction module.

[0015] In the present invention, the water phase inlet of the extraction section in the extraction-washing-stripping module is generally arranged in the mixing chamber of the first-stage mixing and settling tank of the extraction section close to the washing section, and the extractant inlet is generally arranged in the mixing chamber of the first-stage mixing and settling tank of the extraction section away from the washing section, so as to realize countercurrent extraction. Similarly, the washing section and the stripping section generally adopt countercurrent washing and countercurrent stripping, the extraction phase enters from the mixing chamber of the first-stage mixing and settling tank of the stripping section close to the washing section, and the acid solution is fed into from the mixing chamber of the first-stage mixing and settling tank of the stripping section away from the washing section, so as to perform countercurrent stripping.

[0016] Preferably, the plate and frame filter press unit includes at least one level of plate and frame filter press, an unqualified liquid storage tank and a plate and frame flushing tank; the outlet of the brine storage tank is connected to the plate and frame filter press, the qualified filtrate outlet of the plate and frame filter press is connected to the filtrate storage tank, the unqualified filtrate outlet of the plate and frame filter press is connected to the unqualified liquid storage tank, and the outlet of the plate and frame flushing tank is connected to the plate and frame filter press.

[0017] Preferably, the impurity removal module also includes an ion exchange impurity removal unit and an ion exchange impurity removal water production tank; the outlet of the filtrate storage tank is connected to the ion exchange impurity removal unit; the water production side outlet of the ion exchange impurity removal unit is connected to the ion exchange impurity removal water production tank; the outlet of the ion exchange impurity removal water production tank is connected to the water phase inlet of the extraction section in the extraction-washing-strip extraction module; the ion exchange impurity removal unit includes at least one stage of ion exchange resin impurity removal device.

[0018] Preferably, the impurity removal module also includes a lithium-rich solution transfer tank, a first adsorption oil removal unit and a lithium-rich solution storage tank; the lithium-rich solution outlet of the stripping section in the extraction-washing-stripping module is connected to the lithium-rich solution transfer tank, the outlet of the lithium-rich solution transfer tank is connected to the first adsorption oil removal unit, and the water production side outlet of the first adsorption oil removal unit is connected to the lithium-rich solution storage tank; the first adsorption oil removal unit includes at least one stage of adsorption oil removal resin device.

[0019] Preferably, the auxiliary tank body also includes a water-return oil-trapping tank; the lithium-rich solution outlet of the stripping section in the extraction-washing-stripping module is connected to the water-return oil-trapping tank through a pipeline, the outlet of the water-return oil-trapping tank is connected to the lithium-rich solution transfer tank, and the pipeline is integrated into the pipeline integration system of the second plane.

[0020] Preferably, the impurity removal module also includes a second adsorption oil removal unit and a raffinate transfer tank; the outlet of the residual water oil separator is connected to the second adsorption oil removal unit, and the water production side outlet of the second adsorption oil removal unit is connected to the raffinate transfer tank; the second adsorption oil removal unit includes at least one stage of adsorption oil removal resin device.

[0021] Preferably, the auxiliary tank body also includes an organic circulation tank; the organic phase outlet of the stripping section in the extraction-washing-stripping module is connected to the organic circulation tank through a pipeline, and the outlet of the organic circulation tank is connected to the extractant inlet of the extraction section through a pipeline, and the pipeline is integrated into the pipeline integration system of the second plane.

[0022] Preferably, the extraction section, the washing section and the stripping section in the extraction-washing-stripping module are connected in sequence along the flow direction of the extractant through pipelines, and the pipelines are integrated into the pipeline integration system of the second plane.

[0023] Preferably, the extraction section, washing section and stripping section in the extraction-washing-stripping module independently include at least two mixing and settling tanks, and each mixing and settling tank is connected to the emergency transfer tank through a pipeline; the pipeline is integrated into the pipeline integration system of the second plane.

[0024] Preferably, the mixing and settling tank comprises a mixing chamber and a settling chamber, and the settling chamber of the mixing and settling tank is connected to the mixing chamber of the next mixing and settling tank through a pipeline; and the pipeline is integrated into the pipeline integration system of the second plane.

[0025] Preferably, a reflux pipeline is provided in each stage of the mixing and settling tank; the clarification chamber of the mixing and settling tank is connected to the mixing chamber of the current stage through the reflux pipeline, and the reflux pipeline is integrated into the pipeline integration system of the second plane.

[0026] The operation process of the device system provided by the present invention for extracting lithium from salt lakes by extraction is as follows:

[0027] The liquid in the brine storage tank is sent to the plate-frame filter press of the plate-frame filter press unit for filtration, and the filtrate is tested. If the test is qualified, it enters the filtrate storage tank. If the test is unqualified, it enters the unqualified liquid storage tank. The liquid in the unqualified liquid storage tank can be returned to the filtrate storage tank and then sent to the plate-frame filter press again for secondary filtration. The liquid in the plate-frame flushing tank is used to flush the plate-frame filter press.

[0028] The feed liquid in the filtrate storage tank enters the ion exchange resin impurity removal device in the ion exchange impurity removal unit to remove boron and calcium and magnesium. The resulting produced water enters the ion exchange impurity removal water production tank, and then is sent to the mixing chamber of the first-stage mixing and settling tank of the extraction section close to the washing section. The extractant is sent to the mixing chamber of the first-stage mixing and settling tank of the extraction section away from the washing section to perform countercurrent extraction. After that, the raffinate enters the residual water oil separator tank, and the extract phase enters the washing section for countercurrent washing, and then enters the stripping section;

[0029] The extraction phase enters from the first-stage mixing and settling tank of the stripping section close to the washing section, the acid in the acid storage tank is sent from the first-stage mixing and settling tank of the stripping section away from the washing section to perform countercurrent stripping, the lithium-rich solution enters the water-removal oil separator tank, the organic phase is collected in the organic circulation tank, and then sent to the mixing chamber of the first-stage mixing and settling tank of the extraction section away from the washing section for repeated countercurrent extraction;

[0030] A small amount of oil in the lithium-rich solution floats on the water surface in the dewatering oil separator tank and is scraped off, and then enters the lithium-rich solution transfer tank. The lithium-rich solution in the lithium-rich solution transfer tank first enters the first adsorption and oil removal unit for adsorption and oil removal, and then is centrally stored in the lithium-rich solution storage tank;

[0031] The raffinate contains a small amount of oil, which is allowed to stand in the residual water oil separator to allow the oil to float on the water surface and be scraped off. It then enters the second adsorption oil removal unit for adsorption oil removal, is stored in the raffinate transfer tank, and is subsequently discharged into the salt field.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) In the device system provided by the present invention, when leakage occurs in the extraction-washing-stripping module, the auxiliary tank body and its connecting pipelines, the feed liquid in the mixing and settling tank can be transferred to the emergency transfer tank in time by controlling the pipeline switch, so as to facilitate the timely separation of the feed liquid in the mixing and settling tank, eliminate the pump extraction process, and reduce energy consumption. The brine in the extraction section can be transported to the residual water oil separator through the pipeline for oil separation and recovery treatment, thereby avoiding the problems of extraction agent loss and low extraction efficiency caused by incomplete phase separation due to the large amount of brine.

[0034] (2) In the device system provided by the present invention, the main processing system arranged on the first plane includes the main salt lake extraction and lithium extraction device, the pipeline integration system in the second plane facilitates the centralized maintenance and management of the pipelines and reduces the leakage problem, and the auxiliary tank body in the third plane can temporarily transfer and store the feed liquid. By arranging the main processing system, the pipeline integration system and the auxiliary tank body in layers, it is convenient for maintenance and troubleshooting, thereby improving the stability and safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the structure of the device system provided by Example 1 of the present invention;

[0036] In the figure: 1-residual water oil separator tank; 2-emergency transfer tank; 3-brine storage tank; 4-plate and frame filter press; 5-filtrate storage tank; 6-ion exchange impurity removal unit; 7-ion exchange impurity removal water production tank; 8-unqualified liquid storage tank; 9-plate and frame flushing tank; 10-extraction section; 11-washing section; 12-strip extraction section; 13-organic circulation tank; 14-reverse water oil separator tank; 15-mixing chamber; 16-clarification chamber; 17-reflux pipeline; 18-lithium-rich solution transfer tank; 19-first adsorption oil removal unit; 20-lithium-rich solution storage tank; 21-second adsorption oil removal unit; 22-raffinate transfer tank; 23-pump. DETAILED DESCRIPTION

[0037] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0040] In a specific embodiment, Figure 1 As shown, the present invention provides a device system for extracting lithium from salt lakes by extraction method, the device system comprises a first plane, a second plane and a third plane arranged in sequence from top to bottom, the first plane is provided with a main processing system, the second plane is provided with a pipeline integration system, and the third plane is provided with an auxiliary tank body;

[0041] The main treatment system comprises an extraction-washing-stripping module, in which an extraction section 10, a washing section 11 and a stripping section 12 are connected in sequence along the flow direction of the extractant;

[0042] The auxiliary tank body comprises a residual water oil separator tank 1 and an emergency transfer tank 2, and the auxiliary tank body is connected to the extraction-washing-stripping module through a pipeline;

[0043] The pipeline is integrated into the pipeline integration system of the second plane.

[0044] In the device system provided by the present invention, the main processing system is mainly used for extracting, washing and stripping lithium-rich solution, and is arranged on the first plane to facilitate centralized management and monitoring by operators; the auxiliary tank body is mainly used for temporarily storing or processing the feed liquid, and is arranged on the third plane (the first plane, the second plane and the third plane are arranged in sequence from top to bottom, and the third plane generally refers to the ground) to avoid mutual interference with the main processing system; the connecting pipelines of the extraction-washing-stripping module and the auxiliary tank body are integrated on the second plane to facilitate maintenance and overhaul, reduce the impact of maintenance work on normal operations, and in the event of an emergency, can quickly resolve the emergency by controlling the pipeline switch, and optimize the structural layout to improve the utilization of space.

[0045] Furthermore, the outlet of the raffinate in the extraction section 10 is connected to the residual water oil separator 1 through a pipeline; the pipeline is integrated into the pipeline integration system of the second plane.

[0046] In the present invention, the raffinate outlet of the extraction section 10 in the extraction-washing-stripping module is preferably connected to the residual water oil-trapping tank 1 through a pipeline. The raffinate contains a small amount of oil, which will naturally float to the water surface in the residual water oil-trapping tank 1 due to the density difference. By allowing the oil to float on the water surface and scraping it off while standing in the residual water oil-trapping tank 1, the difficulty of subsequent raffinate treatment can be further reduced.

[0047] Furthermore, the device system also includes an impurity removal module; the impurity removal module is arranged on a third plane; the impurity removal module includes a brine storage tank 3, a plate and frame filter press unit and a filtrate storage tank 5 connected in sequence along the flow direction of the feed liquid; the outlet of the filtrate storage tank 5 is connected to the water phase inlet of the extraction section 10 in the extraction-washing-stripping module.

[0048] In the present invention, it is preferred to arrange the impurity removal module on the third plane to facilitate further impurity removal of the slurry, as well as operation and maintenance.

[0049] Furthermore, the plate and frame filter press unit includes at least one level of plate and frame filter press 4, an unqualified liquid storage tank 8 and a plate and frame flushing tank 9; the outlet of the brine storage tank 3 is connected to the plate and frame filter press 4, the qualified filtrate outlet of the plate and frame filter press 4 is connected to the filtrate storage tank 5, the unqualified filtrate outlet of the plate and frame filter press 4 is connected to the unqualified liquid storage tank 8, and the outlet of the plate and frame flushing tank 9 is connected to the plate and frame filter press 4.

[0050] In the present invention, the plate-frame filter press unit is used to remove particulate impurities. Usually, the filtrate at the outlet of the plate-frame filter press 4 is tested (such as turbidity testing). The filtrate that meets the test requirements is qualified filtrate, and the filtrate that does not meet the requirements is unqualified filtrate. Usually, the unqualified liquid storage tank 8 can be set to flow back to the brine storage tank 3, and enter the plate-frame filter press unit again with the brine for secondary filtration, so as to further remove particulate impurities. The plate-frame filter press unit includes at least one level of plate-frame filter press 4, for example, it can be set to level 1, level 2 or level 3, but is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0051] In the present invention, the water phase inlet of the extraction section 10 in the extraction-washing-stripping module is generally arranged in the mixing chamber 15 of the first-stage mixing and settling tank of the extraction section 10 close to the washing section 11, and the extractant inlet is generally arranged in the mixing chamber 15 of the first-stage mixing and settling tank of the extraction section 10 away from the washing section 11, so as to realize countercurrent extraction. Similarly, the washing section 11 and the stripping section 12 generally adopt countercurrent washing and countercurrent stripping, and the extraction phase enters from the mixing chamber 15 of the first-stage mixing and settling tank of the stripping section 12 close to the washing section 11, and the acid solution is fed from the mixing chamber 15 of the first-stage mixing and settling tank of the stripping section 12 away from the washing section 11, so as to perform countercurrent stripping.

[0052] Furthermore, the impurity removal module also includes an ion exchange impurity removal unit 6 and an ion exchange impurity removal water production tank 7; the outlet of the filtrate storage tank 5 is connected to the ion exchange impurity removal unit 6; the water production side outlet of the ion exchange impurity removal unit 6 is connected to the ion exchange impurity removal water production tank 7; the outlet of the ion exchange impurity removal water production tank 7 is connected to the water phase inlet of the extraction section 10 in the extraction-washing-strip extraction module; the ion exchange impurity removal unit 6 includes at least one stage of ion exchange resin impurity removal device.

[0053] In the present invention, the ion exchange impurity removal unit 6 is used to remove impurities such as boron, calcium, and magnesium through ion exchange resin, so as to avoid metal ions causing emulsification of the extractant during the extraction stage. The ion exchange resin impurity removal device can be set to, for example, 1 stage, 2 stages, or 3 stages, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable. Specifically, for example, 2 stages can be set, with the first stage using boron removal resin and the second stage using calcium and magnesium removal resin.

[0054] Furthermore, the impurity removal module also includes a lithium-rich solution transfer tank 18, a first adsorption oil removal unit 19 and a lithium-rich solution storage tank 20; the lithium-rich solution outlet of the stripping section 12 in the extraction-washing-stripping module is connected to the lithium-rich solution transfer tank 18, the outlet of the lithium-rich solution transfer tank 18 is connected to the first adsorption oil removal unit 19, and the water production side outlet of the first adsorption oil removal unit 19 is connected to the lithium-rich solution storage tank 20; the first adsorption oil removal unit 19 includes at least one stage of adsorption oil removal resin device.

[0055] In the present invention, the lithium-rich solution in the lithium-rich solution transfer tank 18 first enters the first adsorption deoiling unit 19 for adsorption deoiling, and then is centrally stored in the lithium-rich solution storage tank 20. The first adsorption deoiling unit 19 includes at least one level of adsorption deoiling resin device, for example, 1 level, 2 levels or 3 levels can be set, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0056] Furthermore, the auxiliary tank body also includes a water-reverse oil-water separator 14; the lithium-rich solution outlet of the stripping section 12 in the extraction-washing-stripping module is connected to the water-reverse oil-water separator 14 through a pipeline, and the outlet of the water-reverse oil-water separator 14 is connected to the lithium-rich solution transfer tank 18, and the pipeline is integrated into the pipeline integration system of the second plane.

[0057] In the present invention, the lithium-rich solution outlet of the stripping section 12 is preferably connected to the water-removal oil separator 14 through a pipeline. A small amount of oil in the lithium-rich solution floats on the water surface in the water-removal oil separator 14 and is scraped off, which can further reduce the difficulty of post-treatment of the lithium-rich solution.

[0058] Furthermore, the impurity removal module also includes a second adsorption oil removal unit 21 and a raffinate transfer tank 22; the outlet of the residual water oil separator 1 is connected to the second adsorption oil removal unit 21, and the water production side outlet of the second adsorption oil removal unit 21 is connected to the raffinate transfer tank 22; the second adsorption oil removal unit 21 includes at least one stage of adsorption oil removal resin device.

[0059] In the present invention, the raffinate first enters the second adsorption deoiling unit 21 for adsorption deoiling, and then is stored in the raffinate transfer tank 22, and then discharged into the salt pan. The second adsorption deoiling unit 21 includes at least one level of adsorption deoiling resin device, for example, one level, two levels or three levels can be set, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0060] Furthermore, the auxiliary tank body also includes an organic circulation tank 13; the organic phase outlet of the stripping section 12 in the extraction-washing-stripping module is connected to the organic circulation tank 13 through a pipeline, and the outlet of the organic circulation tank 13 is connected to the extractant inlet of the extraction section 10 through a pipeline, and the pipeline is integrated into the pipeline integration system of the second plane.

[0061] In the present invention, it is preferred that the organic phase outlet of the stripping section 12 is connected to the organic circulation tank 13 through a pipeline, and the outlet of the organic circulation tank 13 is connected to the extractant inlet of the extraction section 10 through a pipeline, that is, the organic phase after extraction can be collected and sent back to the extractant inlet of the extraction section 10, which can realize the recycling of the organic extractant and improve the utilization rate of the extractant.

[0062] Furthermore, in the extraction-washing-stripping module, the extraction section 10, the washing section 11 and the stripping section 12 are sequentially connected through pipelines along the flow direction of the extractant, and the pipelines are integrated into the pipeline integration system of the second plane.

[0063] In the present invention, it is preferred that the extraction section 10, the washing section 11 and the stripping section 12 are connected by pipelines and the pipelines are integrated in the second plane to facilitate further inspection and maintenance of the extraction-washing-stripping module.

[0064] Furthermore, the extraction section 10, the washing section 11 and the stripping section 12 in the extraction-washing-stripping module independently include at least two mixing and settling tanks, and each mixing and settling tank is connected to the emergency transfer tank 2 through a pipeline; the pipeline is integrated into the pipeline integration system of the second plane.

[0065] In the present invention, it is preferred that each stage of the mixing and settling tank is connected to the emergency transfer tank 2 through a pipeline, so that when an emergency occurs, such as leakage in the extraction tank, the emergency transfer tank 2 can quickly receive the liquid from the mixing and settling tank to prevent the liquid from overflowing, thereby buying time for subsequent emergency treatment.

[0066] Furthermore, the mixing and settling tank comprises a mixing chamber 15 and a settling chamber 16, and the settling chamber 16 of the mixing and settling tank is connected to the mixing chamber 15 of the next mixing and settling tank through a pipeline; and the pipeline is integrated into the pipeline integration system of the second plane.

[0067] In the present invention, it is preferred to arrange the clarification chamber 16 to be connected with the mixing chamber 15 of the next stage mixing and clarification tank through a pipeline and integrate the pipeline into the second plane, so as to facilitate further inspection and maintenance of the mixing and clarification tank.

[0068] Furthermore, a reflux pipeline 17 is provided in each stage of the mixing and settling tank; the clarification chamber 16 of the mixing and settling tank is connected to the mixing chamber 15 of the current stage through the reflux pipeline 17, and the reflux pipeline 17 is integrated into the pipeline integration system of the second plane.

[0069] In the present invention, it is preferred to provide a reflux line 17 to allow part of the liquid in the clarification chamber 16 to return to the mixing chamber 15 for remixing, so that the feed liquid and the extractant can be fully contacted, thereby improving the extraction efficiency.

[0070] In the present invention, the liquid feed can be transported by a commonly used transport device in the art, such as a pump 23 .

[0071] Example 1

[0072] This embodiment provides a device system for extracting lithium from salt lakes by extraction method, such as Figure 1As shown, the device system includes a first plane, a second plane and a third plane arranged in sequence from top to bottom, the first plane is provided with a main processing system, including an extraction-washing-stripping module, the second plane is provided with a pipeline integration system, the third plane is provided with an auxiliary tank body and an impurity removal module, the auxiliary tank body includes a residual water oil separator 1, an emergency transfer tank 2, a reverse water oil separator 14, and an organic circulation tank 13, the auxiliary tank body is connected to the extraction-washing-stripping module through a pipeline, and the pipeline is integrated in the pipeline integration system of the second plane;

[0073] The impurity removal module comprises a brine storage tank 3, a plate-frame filter press unit and a filtrate storage tank 5 which are sequentially connected along the flow direction of the feed liquid, the plate-frame filter press unit comprises a 3-stage plate-frame filter press 4, an unqualified liquid storage tank 8 and a plate-frame flushing tank 9, the outlet of the brine storage tank 3 is connected to the plate-frame filter press 4, the qualified filtrate outlet of the plate-frame filter press 4 is connected to the filtrate storage tank 5, the unqualified filtrate outlet of the plate-frame filter press 4 is connected to the unqualified liquid storage tank 8, the outlet of the plate-frame flushing tank 9 is connected to the plate-frame filter press 4, the outlet of the filtrate storage tank 5 is connected to the ion exchange impurity removal unit 6, the water production side outlet of the ion exchange impurity removal unit 6 is connected to the ion exchange impurity removal water production tank 7, the outlet of the ion exchange impurity removal water production tank 7 is connected to the water phase inlet of the extraction section 10 in the extraction-washing-stripping module, and the ion exchange impurity removal unit 6 comprises at least one stage of ion exchange resin impurity removal device;

[0074] The impurity removal module also includes a lithium-rich solution transfer tank 18, a first adsorption oil removal unit 19 and a lithium-rich solution storage tank 20. The lithium-rich solution outlet of the stripping section 12 in the extraction-washing-stripping module is connected to the water-removal oil separator 14 through a pipeline (a pipeline integration system integrated in the second plane), the outlet of the water-removal oil separator 14 is connected to the lithium-rich solution transfer tank 18, the outlet of the lithium-rich solution transfer tank 18 is connected to the first adsorption oil removal unit 19, the water production side outlet of the first adsorption oil removal unit 19 is connected to the lithium-rich solution storage tank 20, and the first adsorption oil removal unit 19 includes at least one level of adsorption oil removal resin device;

[0075] The impurity removal module further includes a second adsorption oil removal unit 21 and a raffinate transfer tank 22. The outlet of the raffinate in the extraction section 10 is connected to the residual water oil separator 1 through a pipeline (a pipeline integration system integrated in the second plane), the outlet of the residual water oil separator 1 is connected to the second adsorption oil removal unit 21, and the outlet of the second adsorption oil removal unit 21 on the water production side is connected to the raffinate transfer tank 22. The second adsorption oil removal unit 21 includes at least one stage of adsorption oil removal resin device;

[0076] The organic phase outlet of the stripping section 12 in the extraction-washing-stripping module is connected to the organic circulation tank 13 through a pipeline, and the outlet of the organic circulation tank 13 is connected to the extractant inlet of the extraction section 10 through a pipeline, and the pipeline is integrated into the pipeline integration system of the second plane;

[0077] The extraction section 10, the washing section 11 and the stripping section 12 in the extraction-washing-stripping module are connected in sequence through pipelines along the flow direction of the extractant. The extraction section 10, the washing section 11 and the stripping section 12 in the extraction-washing-stripping module independently include at least two levels of mixing and settling tanks. The mixing and settling tanks at each level are connected to the emergency transfer tank 2 through pipelines. The mixing and settling tanks include a mixing chamber 15 and a clarification chamber 16. The clarification chamber 16 of the mixing and settling tank is connected to the mixing chamber 15 of the next mixing and settling tank through pipelines. The above pipelines are integrated into the pipeline integration system of the second plane. A reflux pipeline 17 is arranged in each level of the mixing and settling tank. The clarification chamber 16 of the mixing and settling tank is connected to the mixing chamber 15 of the current level through the reflux pipeline 17. The reflux pipeline 17 is integrated into the pipeline integration system of the second plane.

[0078] The operation process of the device system provided in this embodiment for extracting lithium from salt lakes by extraction is as follows:

[0079] The liquid in the brine storage tank 3 is sent to the plate-frame filter press 4 of the plate-frame filter press unit for filtration, and the filtrate is tested. If the test is qualified, it enters the filtrate storage tank 5. If the test is unqualified, it enters the unqualified liquid storage tank 8. The liquid in the plate-frame flushing tank 9 is used to flush the plate-frame filter press 4;

[0080] The feed liquid in the filtrate storage tank 5 enters the ion exchange resin impurity removal device in the ion exchange impurity removal unit 6 to remove boron and calcium and magnesium. The resulting produced water enters the ion exchange impurity removal produced water tank 7, and then is sent to the mixing chamber 15 of the first-stage mixing and settling tank of the extraction section 10 close to the washing section 11. The extractant is sent to the mixing chamber 15 of the first-stage mixing and settling tank of the extraction section 10 away from the washing section 11 to perform countercurrent extraction. After that, the raffinate enters the residual water oil separator 1, and the extract phase enters the washing section 11 for countercurrent washing, and then enters the stripping section 12;

[0081] The extraction phase enters from the first stage mixing and settling tank of the stripping section 12 close to the washing section 11, and the acid in the acid storage tank (not shown in the figure) is sent from the first stage mixing and settling tank of the stripping section 12 away from the washing section 11 to perform countercurrent stripping, and the lithium-rich solution enters the water-removal oil separator 14. The organic phase is collected in the organic circulation tank 13 and then sent to the mixing chamber 15 of the first stage mixing and settling tank of the extraction section 10 away from the washing section 11 for repeated countercurrent extraction;

[0082] A small amount of oil in the lithium-rich solution floats on the water surface and is scraped off in the water-repellent oil separator 14, and then enters the lithium-rich solution transfer tank 18. The lithium-rich solution in the lithium-rich solution transfer tank 18 first enters the first adsorption and oil removal unit 19 for adsorption and oil removal, and then is centrally stored in the lithium-rich solution storage tank 20;

[0083] The raffinate contains a small amount of oil, which is allowed to stand in the residual water oil separator 1 to allow the oil to float on the water surface and be scraped off, and then enters the second adsorption oil removal unit 21 for adsorption oil removal, and then is stored in the raffinate transfer tank 22 and subsequently discharged into the salt field.

[0084] In summary, the device system provided by the present invention can facilitate maintenance and troubleshooting, deal with leakage problems in a timely manner, and improve operational stability and safety by layering the main processing system, pipeline integration system and auxiliary tank body.

[0085] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A device system for extracting lithium from salt lakes by extraction method, characterized in that: The device system includes a first plane, a second plane and a third plane arranged in sequence from top to bottom, the first plane is provided with a main processing system, the second plane is provided with a pipeline integration system, and the third plane is provided with an auxiliary tank body; The main treatment system comprises an extraction-washing-stripping module, in which an extraction section, a washing section and a stripping section are sequentially connected along the flow direction of the extractant; The auxiliary tank body includes a residual water oil separator tank and an emergency transfer tank, and the auxiliary tank body is connected to the extraction-washing-stripping module through a pipeline; The pipeline is integrated into the pipeline integration system of the second plane.

2. The device system for extracting lithium from salt lakes by extraction method according to claim 1, characterized in that: The outlet of the raffinate in the extraction section is connected to the residual water oil separator through a pipeline; The pipeline is integrated into the pipeline integration system of the second plane.

3. The device system for extracting lithium from salt lakes by extraction method according to claim 2, characterized in that: The device system also includes a decontamination module; The impurity removal module is arranged on the third plane; The impurity removal module comprises a brine storage tank, a plate and frame filter press unit and a filtrate storage tank which are sequentially connected along the flow direction of the feed liquid; The outlet of the filtrate storage tank is connected to the water phase inlet of the extraction section in the extraction-washing-stripping module.

4. The device system for extracting lithium from salt lakes by extraction method according to claim 3, characterized in that: The plate and frame filter press unit comprises at least one stage of plate and frame filter press, a failed liquid storage tank and a plate and frame flushing tank; The outlet of the brine storage tank is connected to the plate and frame filter press, the qualified filtrate outlet of the plate and frame filter press is connected to the filtrate storage tank, the unqualified filtrate outlet of the plate and frame filter press is connected to the unqualified liquid storage tank, and the outlet of the plate and frame flushing tank is connected to the plate and frame filter press.

5. The device system for extracting lithium from salt lakes by extraction method according to claim 3, characterized in that: The impurity removal module also includes an ion exchange impurity removal unit and an ion exchange impurity removal water production tank; The outlet of the filtrate storage tank is connected to the ion exchange impurity removal unit; The water production side outlet of the ion exchange impurity removal unit is connected to the ion exchange impurity removal water production tank; The outlet of the ion exchange impurity removal water production tank is connected to the water phase inlet of the extraction section in the extraction-washing-stripping module; The ion exchange impurity removal unit includes at least one stage of ion exchange resin impurity removal device.

6. The device system for extracting lithium from salt lakes by extraction method according to claim 3, characterized in that: The impurity removal module also includes a lithium-rich solution transfer tank, a first adsorption oil removal unit and a lithium-rich solution storage tank; The lithium-rich solution outlet of the stripping section in the extraction-washing-stripping module is connected to the lithium-rich solution transfer tank, the outlet of the lithium-rich solution transfer tank is connected to the first adsorption and oil removal unit, and the water production side outlet of the first adsorption and oil removal unit is connected to the lithium-rich solution storage tank; The first adsorption deoiling unit comprises at least one stage of adsorption deoiling resin device.

7. The device system for extracting lithium from salt lakes by extraction method according to claim 6, characterized in that: The auxiliary tank body also includes a water-repellent oil separator tank; The lithium-rich solution outlet of the stripping section in the extraction-washing-stripping module is connected to the water-removal oil-trapping tank through a pipeline, and the outlet of the water-removal oil-trapping tank is connected to the lithium-rich solution transfer tank, and the pipeline is integrated into the pipeline integration system of the second plane.

8. The device system for extracting lithium from salt lakes by extraction method according to claim 3, characterized in that: The impurity removal module also includes a second adsorption oil removal unit and a raffinate transfer tank; The outlet of the residual water oil separator is connected to the second adsorption oil removal unit, and the water production side outlet of the second adsorption oil removal unit is connected to the raffinate transfer tank; The second adsorption deoiling unit includes at least one stage of adsorption deoiling resin device.

9. The device system for extracting lithium from salt lakes by extraction method according to claim 1, characterized in that: The auxiliary tank body also includes an organic circulation tank; The organic phase outlet of the stripping section in the extraction-washing-stripping module is connected to the organic circulation tank through a pipeline, and the outlet of the organic circulation tank is connected to the extractant inlet of the extraction section through a pipeline, and the pipeline is integrated into the pipeline integration system of the second plane.

10. The device system for extracting lithium from salt lakes by extraction method according to claim 1, characterized in that: The extraction section, the washing section and the stripping section in the extraction-washing-stripping module are connected in sequence along the flow direction of the extractant through pipelines, and the pipelines are integrated into the pipeline integration system of the second plane.

11. The device system for extracting lithium from salt lakes by extraction method according to claim 1, characterized in that: The extraction section, washing section and stripping section in the extraction-washing-stripping module each independently include at least two mixing and settling tanks, and each mixing and settling tank is connected to the emergency transfer tank through a pipeline; The pipeline is integrated into the pipeline integration system of the second plane.

12. The device system for extracting lithium from salt lakes by extraction method according to claim 11, characterized in that: The mixing and settling tank comprises a mixing chamber and a settling chamber, and the settling chamber of the mixing and settling tank is connected to the mixing chamber of the next mixing and settling tank through a pipeline; The pipeline is integrated into the pipeline integration system of the second plane.

13. The device system for extracting lithium from salt lakes by extraction method according to claim 12, characterized in that: A reflux pipeline is provided in each stage of the mixing and clarifying tank; The clarification chamber of the mixing and clarifying tank is connected to the mixing chamber of the current stage through a reflux pipeline, and the reflux pipeline is integrated into the pipeline integration system of the second plane.

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