An extraction device system for extracting lithium from salt lakes

Abstract

The present invention relates to a device system for extracting lithium from salt lakes by extraction method. 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 treatment system, the second plane is provided with a pipeline integration system, and the third plane is provided with auxiliary tanks. The main treatment system includes an extraction-scrubbing-stripping module, and in the extraction-scrubbing-stripping module, an extraction section, a scrubbing section and a stripping section are connected in sequence along the flow direction of the extractant. The auxiliary tanks include a residual water and oil separation tank and an emergency transfer tank, and the auxiliary tanks are connected to the extraction-scrubbing-stripping module through pipelines. The pipelines are integrated in the pipeline integration system on the second plane. The device system provided by the present invention can facilitate maintenance and troubleshooting by arranging the main treatment system, the pipeline integration system and the auxiliary tanks in layers, timely handle the liquid leakage problem, and improve the operation stability and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium extraction from salt lakes, and particularly to a device system for extracting lithium from salt lakes by extraction method. Background Art

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

[0003] In the existing lithium extraction system from lithium batteries, the tank body is generally set on the ground. In the process of lithium extraction from salt lakes, with the increase in the number and volume of extraction tanks, liquid leakage is likely to occur. The overall salt lake brine is alkaline. Compared with the acidic original solution in acid leaching during battery recycling, the alkaline feed liquid is more likely to cause slow phase separation and emulsification. During the actual production operation, liquid leakage and frequent transfer of extractant are likely to occur, resulting in an increase in operating costs and a decrease in production efficiency.

[0004] For example, CN106119575A discloses a process for extracting lithium from salt lake brine using a box - type extraction tank, including five main sections: extraction, washing, stripping, saponification, and acid washing, making use of the low cost of the box - type extraction tank. However, in the actual process, more equipment is required to achieve multi - stage extraction, resulting in an increase in the difficulty of maintenance and management, and there is a risk of liquid leakage during long - term operation, making maintenance and servicing inconvenient.

[0005] In the process of extracting lithium from salt lakes by extraction method, due to the large volume of brine for extraction, high brine saturation, and high capacity of extraction tanks, crystallization, liquid leakage, etc. are likely to occur in the extraction tanks and pipelines, making it difficult to repair and clean the extraction tanks in a timely manner. At the same time, due to the large volume of brine, it takes a long time for the brine and the organic phase to be completely separated, resulting in low extraction efficiency. Therefore, a device system for extracting lithium from salt lakes by extraction method is provided. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a device system for extracting lithium from salt lakes by extraction method. Compared with the existing technology, the device system provided by the present invention can facilitate maintenance and troubleshooting, timely handle liquid leakage problems, and improve the stability and safety of operation by hierarchically arranging the main treatment system, pipeline integration system, and auxiliary tanks.

[0007] To achieve the purpose of this invention, the present invention adopts the following technical solutions:

[0008] The present invention provides a device system for extracting lithium from salt lakes by extraction method. 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 treatment system, the second plane is provided with a pipeline integration system, and the third plane is provided with auxiliary tanks.

[0009] The main treatment system includes an extraction-scrubbing-stripping module. In the extraction-scrubbing-stripping module, an extraction section, a scrubbing section, and a stripping section are connected in sequence along the flow direction of the extractant.

[0010] The auxiliary tanks include a surplus water and oil separation tank and an emergency transfer tank. The auxiliary tanks are connected to the extraction-scrubbing-stripping module through pipelines.

[0011] The pipelines are integrated into the pipeline integration system on the second plane.

[0012] In the device system provided by the present invention, the main treatment system is mainly used for extracting lithium-rich solution by extraction, scrubbing, and stripping methods. It is arranged on the first plane to facilitate centralized management and monitoring by operators. The auxiliary tanks are mainly used for temporarily storing or treating the feed liquid. They are 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 treatment system. The connecting pipelines between the extraction-scrubbing-stripping module and the auxiliary tanks are integrated on the second plane, which is convenient for maintenance and repair, reduces the impact of maintenance work on normal operations, and can quickly solve emergencies by controlling the pipeline switches in case of emergencies. Moreover, the structural layout is optimized to improve the utilization rate of space.

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

[0014] Preferably, the device system further includes a purification module; the purification module is arranged on the third plane; the purification 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 aqueous phase inlet of the extraction section in the extraction-scrubbing-stripping module.

[0015] In the present invention, the aqueous phase inlet of the extraction section in the extraction-scrubbing-stripping module is generally arranged in the mixing chamber of the first-stage mixer-settler in the extraction section close to the scrubbing section, and the inlet of the extractant is generally arranged in the mixing chamber of the first-stage mixer-settler in the extraction section far from the scrubbing section, so as to achieve countercurrent extraction. Similarly, the scrubbing section and the stripping section generally adopt countercurrent scrubbing and countercurrent stripping. The extraction phase enters from the mixing chamber of the first-stage mixer-settler in the stripping section close to the scrubbing section, and the acid solution is fed into the mixing chamber of the first-stage mixer-settler in the stripping section far from the scrubbing section, so as to carry out countercurrent stripping.

[0016] Preferably, the plate and frame filter press unit includes at least one stage 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 further includes an ion exchange impurity removal unit and an ion exchange impurity removal product water tank; the outlet of the filtrate storage tank is connected to the ion exchange impurity removal unit; the product water side outlet of the ion exchange impurity removal unit is connected to the ion exchange impurity removal product water tank; the outlet of the ion exchange impurity removal product water tank is connected to the aqueous phase inlet of the extraction section in the extraction - washing - back - 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 further includes a lithium - rich solution transfer tank, a first oil adsorption removal unit, and a lithium - rich solution storage tank; the lithium - rich solution outlet of the back - extraction section in the extraction - washing - back - extraction module is connected to the lithium - rich solution transfer tank, the outlet of the lithium - rich solution transfer tank is connected to the first oil adsorption removal unit, and the product water side outlet of the first oil adsorption removal unit is connected to the lithium - rich solution storage tank; the first oil adsorption removal unit includes at least one stage of oil adsorption removal resin device.

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

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

[0021] Preferably, the auxiliary tank body further includes an organic circulation tank; the organic phase outlet of the back - extraction section in the extraction - washing - back - extraction 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 on the second plane.

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

[0023] Preferably, the extraction - washing - stripping module's extraction section, washing section, and stripping section each independently include at least 2 - stage mixer - settlers, and each stage of the mixer - settlers is connected to the emergency transfer tank through pipelines; the pipelines are integrated into the pipeline integration system on the second plane.

[0024] Preferably, the mixer - settler includes a mixing chamber and a clarification chamber, and the clarification chamber of the mixer - settler is connected to the mixing chamber of the next - stage mixer - settler through a pipeline; the pipeline is integrated into the pipeline integration system on the second plane.

[0025] Preferably, a reflux pipeline is arranged in each stage of the mixer - settler; the clarification chamber of the mixer - settler is connected to its own mixing chamber through the reflux pipeline, and the reflux pipeline is integrated into the pipeline integration system on the second plane.

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

[0027] The feed liquid in the brine storage tank is sent to the plate - and - frame filter press in the plate - and - frame filtration unit for filtration, and the filtrate is detected. If the detection is qualified, it enters the filtrate storage tank; if the detection is unqualified, it enters the unqualified liquid storage tank. The feed liquid in the unqualified liquid storage tank can be refluxed to the filtrate storage tank and then sent to the plate - and - frame filter press again for secondary filtration. The feed liquid in the plate - frame washing tank is used to wash the plate - and - 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 for boron and calcium - magnesium removal. The resulting product water enters the ion - exchange impurity - removal product water tank and then is sent to the mixing chamber of the first - stage mixer - settler near the washing section in the extraction section. The extractant is sent to the mixing chamber of the first - stage mixer - settler far from the washing section in the extraction section for counter - current extraction. Then, the raffinate enters the residual water oil - separation tank, and the extraction phase enters the washing section for counter - current washing and then enters the stripping section;

[0029] The extraction phase enters from the first - stage mixer - settler near the washing section in the stripping section, and the acid liquid in the acid liquid storage tank is sent from the first - stage mixer - settler far from the washing section in the stripping section for counter - current stripping. The lithium - rich solution enters the reverse water oil - separation tank, and the organic phase is collected in the organic circulation tank and then sent to the mixing chamber of the first - stage mixer - settler far from the washing section in the extraction section to be repeatedly used for counter - current extraction;

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

[0031] The raffinate contains a small amount of oil. It is left standing in the residual water oil separation tank so that the oil floats on the water surface and is scraped off. Then it enters the second adsorption oil removal unit for adsorption oil removal, and then is stored in the raffinate transfer tank, and then discharged into the salt pan.

[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 their connecting pipelines, the liquid in the mixer-settler can be transferred to the emergency transfer tank in time by controlling the pipeline switch, which is convenient for separating the liquid in the mixer-settler in time, eliminating the process of pumping by a pump, reducing energy consumption. The brine in the extraction section can be transported through the pipeline to the residual water oil separation tank for oil separation and recovery treatment, avoiding problems such as loss of extractant and low extraction efficiency caused by incomplete phase separation due to a large amount of brine.

[0034] (2) In the device system provided by the present invention, the main body treatment system arranged on the first plane includes the main salt lake lithium extraction device. The pipeline integration system on the second plane is convenient for centralized maintenance and management of pipelines, reducing leakage problems. The auxiliary tank body on the third plane can temporarily transfer and store the liquid. By hierarchically arranging the main body treatment system, the pipeline integration system and the auxiliary tank body, it is convenient for maintenance and troubleshooting, improving the stability and safety of operation. Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the device system provided in Embodiment 1 of the present invention;

[0036] In the figure: 1-residual water oil separation 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 product water tank; 8-unqualified liquid storage tank; 9-plate and frame washing tank; 10-extraction section; 11-washing section; 12-stripping section; 13-organic circulation tank; 14-backwater oil separation tank; 15-mixing chamber; 16-clarification chamber; 17-return 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 Embodiments

[0037] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention.

[0038] It should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "set", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0039] The technical solution of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0040] In a specific embodiment, as Figure 1 shown, the present invention provides a device system for extracting lithium from salt lakes by the extraction method. 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 treatment system, the second plane is provided with a pipeline integration system, and the third plane is provided with auxiliary tanks;

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

[0042] The auxiliary tanks include a surplus water and oil separation tank 1 and an emergency transfer tank 2. The auxiliary tanks are connected to the extraction-scrubbing-stripping module through pipelines;

[0043] The pipelines are integrated into the pipeline integration system on the second plane.

[0044] In the device system provided by the present invention, the main body processing system is mainly used for extracting, washing, and stripping to extract the lithium-rich solution, and it 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 it 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 interference with the main body processing system; the connecting pipelines between the extraction-washing-stripping module and the auxiliary tank body are integrated on the second plane, which is convenient for maintenance and repair, reduces the impact of maintenance work on normal operations, and can quickly solve emergencies by controlling the pipeline switches in case of emergencies. Moreover, the structural layout is optimized to improve the utilization rate of space.

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

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

[0047] Further, the device system further includes a purification module; the purification module is arranged on the third plane; the purification 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 aqueous phase inlet of the extraction section 10 in the extraction-washing-stripping module.

[0048] In the present invention, it is preferably set that the purification module is on the third plane, which is convenient for further purifying the feed liquid and for operation and maintenance.

[0049] Further, the plate and frame filter press unit includes at least one stage of plate and frame filter press 4, an unqualified liquid storage tank 8, and a plate and frame washing 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 washing tank 9 is connected to the plate and frame filter press 4.

[0050] In the present invention, the plate-and-frame filtration unit is used to remove particulate impurities. Generally, the filtrate at the outlet of the plate-and-frame filter press 4 is detected (such as detecting turbidity). The filtrate that meets the detection requirements is qualified filtrate, and the filtrate that does not meet the requirements is unqualified filtrate. Generally, the unqualified liquid storage tank 8 can be set to return to the brine storage tank 3 and enter the plate-and-frame filtration unit again with the brine for secondary filtration, so as to further remove particulate impurities. The plate-and-frame filtration unit includes at least 1 stage of plate-and-frame filter press 4. For example, it can be set to 1 stage, 2 stages or 3 stages, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable.

[0051] In the present invention, the aqueous 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 mixer-settler of the extraction section 10 close to the washing section 11, and the inlet of the extractant is generally arranged in the mixing chamber 15 of the first-stage mixer-settler of the extraction section 10 far from the washing section 11, so as to achieve countercurrent extraction. Similarly, the washing section 11 and the stripping section 12 generally adopt countercurrent washing and countercurrent stripping. The extraction phase enters from the mixing chamber 15 of the first-stage mixer-settler 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 mixer-settler of the stripping section 12 far from the washing section 11, so as to carry out countercurrent stripping.

[0052] Furthermore, the impurity removal module further includes an ion exchange impurity removal unit 6 and an ion exchange impurity removal product water tank 7; the outlet of the filtrate storage tank 5 is connected to the ion exchange impurity removal unit 6; the product water side outlet of the ion exchange impurity removal unit 6 is connected to the ion exchange impurity removal product water tank 7; the outlet of the ion exchange impurity removal product water tank 7 is connected to the aqueous phase inlet of the extraction section 10 in the extraction-washing-stripping module; the ion exchange impurity removal unit 6 includes at least 1 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 the emulsification of the extractant caused by metal ions during the extraction stage. The ion exchange resin impurity removal device can be set to 1 stage, 2 stages or 3 stages, for example, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable. Specifically, for example, it can be set to 2 stages, with the first stage using boron-removing resin and the second stage using calcium-magnesium-removing resin.

[0054] Furthermore, the impurity removal module further includes a lithium-rich solution transfer tank 18, a first oil adsorption 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 oil adsorption removal unit 19, and the product water side outlet of the first oil adsorption removal unit 19 is connected to the lithium-rich solution storage tank 20; the first oil adsorption removal unit 19 includes at least 1 stage of oil adsorption removal resin device.

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

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

[0057] In the present invention, it is preferably set that the lithium-rich solution outlet of the stripping section 12 is connected to the backwater oil separation tank 14 through a pipeline. A small amount of oil in the lithium-rich solution floats on the water surface through static settlement in the backwater oil separation tank 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 further includes a second oil adsorption and removal unit 21 and a raffinate transfer tank 22; the outlet of the waste water oil separation tank 1 is connected to the second oil adsorption and removal unit 21, and the water production side outlet of the second oil adsorption and removal unit 21 is connected to the raffinate transfer tank 22; the second oil adsorption and removal unit 21 includes at least one stage of oil adsorption and removal resin device.

[0059] In the present invention, the raffinate first enters the second oil adsorption and removal unit 21 for oil adsorption and removal, then is stored in the raffinate transfer tank 22, and then is discharged into the salt pan. The second oil adsorption and removal unit 21 includes at least one stage of oil adsorption and removal resin device. For example, it can be set to 1 stage, 2 stages or 3 stages, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0060] Furthermore, the auxiliary tank body further 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. The pipeline is integrated into the pipeline integration system on the second plane.

[0061] In the present invention, it is preferably set 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 re-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] Further, 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 on the second plane.

[0063] In the present invention, it is preferably set that the extraction section 10, the washing section 11, and the stripping section 12 are connected through pipelines and the pipelines are integrated into the second plane, which is convenient for further overhaul and maintenance of the extraction-washing-stripping module.

[0064] Further, in the extraction-washing-stripping module, the extraction section 10, the washing section 11, and the stripping section 12 each independently include at least 2 stages of mixer-settlers, and each stage of the mixer-settler is connected to the emergency transfer tank 2 through a pipeline; the pipelines are integrated into the pipeline integration system on the second plane.

[0065] In the present invention, it is preferably set that each stage of the mixer-settler is connected to the emergency transfer tank 2 through a pipeline. When an emergency occurs, such as liquid leakage in the extraction tank, the emergency transfer tank 2 can quickly receive the liquid from the mixer-settler, prevent liquid spillage, and gain time for subsequent emergency treatment.

[0066] Further, the mixer-settler includes a mixing chamber 15 and a clarification chamber 16, and the clarification chamber 16 of the mixer-settler is connected to the mixing chamber 15 of the next-stage mixer-settler through a pipeline; the pipelines are integrated into the pipeline integration system on the second plane.

[0067] In the present invention, it is preferably set that the clarification chamber 16 is connected to the mixing chamber 15 of the next-stage mixer-settler through a pipeline and the pipelines are integrated into the second plane, which is convenient for further overhaul and maintenance of the mixer-settler.

[0068] Further, a reflux pipeline 17 is arranged in each stage of the mixer-settler; the clarification chamber 16 of the mixer-settler is connected to the mixing chamber 15 of the same stage through the reflux pipeline 17, and the reflux pipeline 17 is integrated into the pipeline integration system on the second plane.

[0069] In the present invention, it is preferably set that the reflux pipeline 17 enables some liquid in the clarification chamber 16 to return to the mixing chamber 15 again for mixing, enabling the feed liquid and the extractant to be fully contacted, thereby improving the extraction efficiency.

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

[0071] Example 1

[0072] This example provides a device system for extracting lithium from salt lakes by extraction method, 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-back extraction 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 surplus water oil separation tank 1, an emergency transfer tank 2, a backwater oil separation tank 14, and an organic circulation tank 13. The auxiliary tank body is connected to the extraction-washing-back extraction module through pipelines, and the pipelines are integrated into the pipeline integration system on the second plane;

[0073] 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 plate and frame filter press unit includes a three-stage plate and frame filter press 4, a non-conforming liquid storage tank 8, and a plate and frame washing 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 non-conforming filtrate outlet of the plate and frame filter press 4 is connected to the non-conforming liquid storage tank 8. The outlet of the plate and frame washing tank 9 is connected to the plate and frame filter press 4. The outlet of the filtrate storage tank 5 is connected to an ion exchange impurity removal unit 6. The water production side outlet of the ion exchange impurity removal unit 6 is connected to an 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-back extraction module. The ion exchange impurity removal unit 6 includes at least one stage of ion exchange resin impurity removal device;

[0074] The impurity removal module further 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 back extraction section 12 in the extraction-washing-back extraction module is connected to the backwater oil separation tank 14 through pipelines (integrated into the pipeline integration system on the second plane). The outlet of the backwater oil separation tank 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. The first adsorption oil removal unit 19 includes at least one stage 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 surplus water oil separation tank 1 through pipelines (integrated into the pipeline integration system on the second plane). The outlet of the surplus water oil separation tank 1 is connected to the second adsorption oil removal unit 21. 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;

[0076] The organic phase outlet of the stripping - washing - back - extraction section 12 in the extraction - washing - back - extraction module is connected to the organic circulation tank 13 through a pipeline. 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 on the second plane;

[0077] In the extraction - washing - back - extraction module, the extraction section 10, the washing section 11, and the stripping section 12 are connected in sequence through pipelines along the flow direction of the extractant. Each of the extraction section 10, the washing section 11, and the stripping section 12 in the extraction - washing - back - extraction module independently includes at least 2 - stage mixer - settlers. Each stage of the mixer - settlers is connected to the emergency transfer tank 2 through a pipeline. The mixer - settlers include a mixing chamber 15 and a clarification chamber 16. The clarification chamber 16 of the mixer - settlers is connected to the mixing chamber 15 of the next - stage mixer - settlers through a pipeline. The above pipelines are all integrated into the pipeline integration system on the second plane. A reflux pipeline 17 is arranged in each stage of the mixer - settlers. The clarification chamber 16 of the mixer - settlers is connected to the mixing chamber 15 of this stage through the reflux pipeline 17, and the reflux pipeline 17 is integrated into the pipeline integration system on the second plane.

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

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

[0080] The liquid in the filtrate storage tank 5 enters the ion - exchange resin impurity removal device in the ion - exchange impurity removal unit 6 for boron and calcium - magnesium removal. The produced water obtained enters the ion - exchange impurity removal produced - water tank 7, and then is sent into the mixing chamber 15 of the first - stage mixer - settler of the extraction section 10 close to the washing section 11. The extractant is sent into the mixing chamber 15 of the first - stage mixer - settler of the extraction section 10 far from the washing section 11 for counter - current extraction. After that, the raffinate enters the residual water oil - separation tank 1, and the extraction phase enters the washing section 11 for counter - current washing, and then enters the stripping section 12;

[0081] The extraction phase enters from the first - stage mixer - settler of the stripping section 12 close to the washing section 11. The acid liquid in the acid liquid storage tank (not shown in the figure) is sent into the first - stage mixer - settler of the stripping section 12 far from the washing section 11 for counter - current stripping. The lithium - rich solution enters the back - water oil - separation tank 14, and the organic phase is collected in the organic circulation tank 13, and then is sent into the mixing chamber 15 of the first - stage mixer - settler of the extraction section 10 far from the washing section 11 for repeated use in counter - current extraction;

[0082] A small amount of oil in the lithium-rich solution floats on the water surface through static settlement in the reverse water oil separation tank 14 and is scraped off, 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 oil removal unit 19 for adsorption oil removal, and then is centrally stored in the lithium-rich solution storage tank 20;

[0083] The raffinate contains a small amount of oil. It is statically settled in the residual water oil separation tank 1 to make the oil float on the water surface and is scraped off. Then it enters the second adsorption oil removal unit 21 for adsorption oil removal, and then is stored in the raffinate transfer tank 22, and then is discharged into the salt field.

[0084] In summary, the device system provided by the present invention can facilitate maintenance and troubleshooting and timely handle the liquid leakage problem by hierarchically arranging the main treatment system, the pipeline integration system and the auxiliary tank body, improving the operation stability and safety.

[0085] The applicant declares that the above is only the specific implementation manner 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 any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. An apparatus system for extracting lithium from salt lakes by an 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 processing system includes an extraction-washing-stripping module. In the extraction-washing-stripping module, an extraction section, a washing section, and a stripping section are sequentially connected through pipelines along the flow direction of the extractant. The main processing system is used for extracting lithium from alkaline salt lake brine; The auxiliary tank body includes a waste water oil separation tank and an emergency transfer tank. The auxiliary tank body is connected to the extraction-washing-stripping module through pipelines. The outlet of the raffinate in the extraction section is connected to the waste water oil separation tank through a pipeline. The auxiliary tank body is mainly used for temporarily storing or treating the feed liquid. The auxiliary tank body is arranged on the third plane to avoid interference with the main processing system; The pipelines are integrated into the pipeline integration system on the second plane. The pipeline integration system facilitates centralized maintenance and management of the pipelines, reduces and timely processes the liquid leakage problem.

2. The device system for extracting lithium from salt lakes by the extraction method according to claim 1, wherein, The device system further includes a purification module; The purification module is arranged on the third plane; The purification 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 aqueous phase inlet of the extraction section in the extraction-washing-stripping module.

3. The device system for extracting lithium from salt lakes by the extraction method according to claim 2, wherein The plate and frame filter press unit includes at least one stage 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. The outlet of the plate and frame flushing tank is connected to the plate and frame filter press.

4. The device system for extracting lithium from salt lakes by the extraction method according to claim 2, characterized in that, The purification module further includes an ion exchange purification unit and an ion exchange purification product water tank; The outlet of the filtrate storage tank is connected to the ion exchange purification unit; The product water side outlet of the ion exchange purification unit is connected to the ion exchange purification product water tank; The outlet of the ion exchange purification product water tank is connected to the aqueous phase inlet of the extraction section in the extraction-washing-stripping module; The ion exchange purification unit includes at least one stage of ion exchange resin purification device.

5. The device system for extracting lithium from salt lakes by the extraction method according to claim 2, characterized in that, The purification module further includes a lithium-rich solution transfer tank, a first oil adsorption 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 oil adsorption unit. The product water side outlet of the first oil adsorption unit is connected to the lithium-rich solution storage tank; The first oil adsorption unit includes at least one stage of oil adsorption resin device.

6. The device system for extracting lithium from salt lakes by the extraction method according to claim 5, characterized in that, [[ID= ​ 7. The device system for extracting lithium from salt lakes by the extraction method according to claim 2, characterized in that, ​ ​ The second oil adsorption and removal unit includes at least one stage of oil adsorption and removal resin device.

8. The device system for extracting lithium from salt lakes by the extraction method according to claim 1, wherein The auxiliary tank body further 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. The pipeline is integrated into the pipeline integration system on the second plane.

9. The device system for extracting lithium from salt lakes by the extraction method according to claim 1, wherein The extraction section, washing section, and stripping section in the extraction - washing - stripping module each independently include at least two stages of mixer - settlers, and each stage of the mixer - settler is connected to the emergency transfer tank through a pipeline; The pipeline is integrated into the pipeline integration system on the second plane.

10. The device system for extracting lithium from salt lakes by the extraction method according to claim 9, characterized in that, The mixer - settler includes a mixing chamber and a clarification chamber. The clarification chamber of the mixer - settler is connected to the mixing chamber of the next - stage mixer - settler through a pipeline; The pipeline is integrated into the pipeline integration system on the second plane.

11. The device system for extracting lithium from salt lakes by the extraction method according to claim 10, wherein, A reflux pipeline is arranged in each stage of the mixer - settler; The clarification chamber of the mixer - settler is connected to the mixing chamber of this stage through the reflux pipeline, and the reflux pipeline is integrated into the pipeline integration system on the second plane.

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