A resource recovery device system for lithium precipitation mother liquor

Abstract

This invention provides a resource recovery device system for lithium precipitation mother liquor. Through the coordinated use of a pretreatment unit, conditioning unit, extraction unit, washing unit, back-extraction unit, and raffinate post-treatment unit connected in sequence, it achieves maximum recovery and utilization of lithium ions in the lithium precipitation mother liquor, reduces lithium resource waste, ensures the greenness, stability, and controllability of the extraction process, and results in a high-lithium liquid product with low metal impurity ion content and high lithium extraction rate, while the raffinate meets discharge standards. The resource recovery device system has a simple structure, low operation difficulty, and low manufacturing cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of lithium extraction from lithium precipitation mother liquor, and relates to a resource recovery device system for lithium precipitation mother liquor. Background Technology

[0002] Lithium carbonate is an important lithium salt. Lithium ore refining or brine lithium extraction processes ultimately yield a lithium-rich solution. After impurity removal, this solution undergoes a precipitation reaction with sodium carbonate. Following washing and drying, lithium carbonate is obtained. The lithium-rich solution remaining after lithium carbonate precipitation is known as the lithium precipitation mother liquor. However, in this process, due to the limited equilibrium solubility of lithium carbonate in a high-salt environment, the single-pass yield of the precipitation reaction is only about 83%, leaving approximately 17% of lithium ions in the mother liquor and unable to be recovered to produce lithium carbonate. Therefore, lithium resources in brine lithium extraction are not efficiently utilized. Based on this calculation, if approximately 90% of the lithium resources in the mother liquor could be recovered, the production of lithium carbonate from brine would directly increase by more than 15%. This is of great significance for the comprehensive utilization of lithium resources and for the development and improvement of brine lithium extraction technology.

[0003] Currently, traditional methods for recovering lithium from lithium precipitate mother liquor mainly include the lithium phosphate method, acid concentration method, acid self-circulation method, and solvent extraction method. Among these, solvent extraction is widely used due to its high separation efficiency, low energy consumption, and less dependence on energy compared to traditional processes. However, although some lithium precipitate mother liquor recovery devices have been disclosed in existing technologies, these devices have many problems, such as complex structures leading to high operation difficulties and consequently high production costs. Furthermore, these devices also result in lithium resource waste and high levels of metal impurity ions in the lithium products, and the treatment of the raffinate is inadequate, with direct discharge without treatment, which does not meet environmental protection requirements.

[0004] In summary, this invention provides a resource recovery device system for lithium precipitation mother liquor, which solves the problems of high metal impurity ion content, low lithium extraction rate, and pollution from raffinate discharge in the obtained lithium product. This is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a resource recovery device system for lithium precipitation mother liquor. Through the coordinated use of a pretreatment unit, conditioning unit, extraction unit, washing unit, back-extraction unit, and raffinate post-treatment unit connected in sequence, the system achieves maximum recovery and utilization of lithium ions in the lithium precipitation mother liquor, reduces the waste of lithium resources, ensures the greenness, stability, and controllability of the extraction process, and results in a high-lithium liquid product with low content of metal impurity ions and high lithium extraction rate, while the raffinate can meet discharge standards.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a resource recovery device system for lithium precipitation mother liquor, the resource recovery device system including a lithium precipitation mother liquor storage device, a pretreatment unit, a conditioning unit, an extraction unit, a washing unit, a back-extraction unit and a raffinate post-treatment unit;

[0008] Along the material conveying direction, the lithium precipitation mother liquor storage device, pretreatment unit, conditioning unit, extraction unit, washing unit and back-extraction unit are connected in sequence through pipelines;

[0009] The conditioning unit includes a first pH adjustment device, a calcium and magnesium removal device, and a second pH adjustment device connected in sequence.

[0010] The outlet of the pretreatment unit is connected to the inlet of the first pH adjustment device; the outlet of the second pH adjustment device is connected to the inlet of the extraction unit.

[0011] Along the material conveying direction, the last stage of the back-extraction unit is equipped with a high-lithium liquid outlet;

[0012] The raffinate outlet of the extraction unit is connected to the inlet of the raffinate post-treatment unit.

[0013] In this invention, the lithium in the lithium precipitation mother liquor is Li + Concentration is 1.0-2.5 g / L, K + Concentration of 20-50 g / L, Na + Concentration of 10-60 g / L, Mg 2+ The concentration is 0.001-0.01 g / L, Ca 2+ The concentration is 0.001-0.01 g / L, Cl - The concentration of the lithium precipitation mother liquor is 50-100 g / L and the concentration of CO3²⁻ is 10-30 g / L; the pH of the lithium precipitation mother liquor is 11.5-14.

[0014] In this invention, the pH value of the lithium precipitation mother liquor after passing through the first pH adjustment device is <11; the pH value of the lithium precipitation mother liquor after passing through the first pH adjustment device is 9.5-10.5.

[0015] The resource recovery device system provided by this utility model achieves maximum recovery and utilization of lithium ions in the mother lithium liquid through the coordinated use of a pretreatment unit, conditioning unit, extraction unit, washing unit, back-extraction unit and raffinate post-treatment unit connected in sequence. This reduces the waste of lithium resources, ensures the greenness, stability and controllability of the extraction process, and results in a high-lithium liquid product with low content of metal impurity ions and high lithium extraction rate, while the raffinate can meet the discharge standards.

[0016] It should be noted that multi-stage conditioning of the lithium precipitation mother liquor is used to improve the lithium extraction rate and the purity of the resulting product. The mother liquor in the pretreatment unit undergoes pH adjustment (i.e., a first pH adjustment device is installed) before entering the calcium and magnesium removal unit to prevent clogging of the calcium and magnesium removal unit due to excessive alkalinity of the lithium precipitation mother liquor. Then, the calcium and magnesium removal unit is used to remove calcium and magnesium ions, preventing them from being back-extracted with lithium and remaining in the high-lithium liquid product, thus affecting product quality. Finally, the mother liquor in the conditioning unit undergoes pH adjustment (i.e., a second pH adjustment device is installed) before entering the extraction unit to ensure that the conditioned mother liquor meets the pH range required for extraction, thereby improving subsequent extraction efficiency and extraction rate, and preventing emulsification problems during the extraction process.

[0017] It should also be noted that the raffinate is treated by the raffinate post-treatment unit, and the treated raffinate meets the discharge standards and does not cause any environmental pollution.

[0018] As a preferred technical solution of this utility model, the pretreatment unit includes a cooling device, a first impurity removal device, and a second impurity removal device connected in sequence.

[0019] In this invention, because the temperature of the lithium precipitation mother liquor is relatively high, it needs to be cooled to room temperature. Additionally, because the lithium precipitation mother liquor contains large particulate impurities such as silt and suspended solids, it requires two-stage filtration to thoroughly remove silt and suspended solids, thus preventing them from affecting subsequent processing.

[0020] The inlet of the cooling device is connected to the lithium precipitation mother liquor storage device.

[0021] The first impurity removal device is independently provided with a first outlet and a second outlet.

[0022] The first outlet is connected to the inlet of the second impurity removal device.

[0023] The second outlet is connected to the lithium mother liquor storage device.

[0024] In this invention, the cooled lithium precipitation mother liquor is processed by a first impurity removal device to obtain qualified filtrate and unqualified filtrate (or residual solution). The qualified filtrate enters a second impurity removal device through a first outlet for further impurity removal and filtration, while the unqualified filtrate (or residual solution) is returned to the lithium precipitation mother liquor storage device through a second outlet to be mixed with new lithium precipitation mother liquor and recycled.

[0025] The outlet of the second impurity removal device is connected to the inlet of the first pH adjustment device.

[0026] As a preferred technical solution of this utility model, the first impurity removal device is a plate and frame filter.

[0027] The second impurity removal device is a security filter or an ultrafiltration membrane module.

[0028] As a preferred technical solution of this utility model, the calcium and magnesium removal device is a continuous electrochemical exchange device.

[0029] The continuous ion exchange device is filled with chelating resin.

[0030] As a preferred technical solution of this utility model, the resource recycling device system also includes a water production storage device.

[0031] In this invention, those skilled in the art can determine whether to set up a product water storage device according to actual production needs. If not, the second pH adjustment device can be directly connected to the extraction device.

[0032] The water production storage device is installed on the pipeline connecting the second pH adjustment device and the extraction device.

[0033] As a preferred technical solution of this utility model, the extraction unit includes several extraction devices connected in series.

[0034] In this invention, the extraction device has ≥2 stages.

[0035] Along the material conveying direction, the first-stage extraction device is independently equipped with an extract liquid inlet and a conditioned mother liquor inlet; the last-stage extraction device is independently equipped with a loaded extract phase outlet and a raffinate outlet.

[0036] In this invention, the extraction liquid can be any conventional extraction liquid used for lithium extraction in the prior art, and no specific limitation is made here. The extraction liquid storage device can be selected and set according to actual production needs.

[0037] The outlet of the second pH adjustment device is connected to the inlet of the conditioned mother liquor from the first-stage extraction device.

[0038] The outlet of the loaded extraction phase of the final stage extraction device is connected to the inlet of the washing unit.

[0039] The extraction device is a chamber-type extraction tank or a centrifugal extractor.

[0040] As a preferred technical solution of this utility model, the washing unit includes several washing devices connected in series.

[0041] In this invention, the washing device has ≥2 stages.

[0042] Along the material conveying direction, the first-stage washing device is independently equipped with a washing liquid inlet and a loaded extraction phase inlet; the last-stage washing device is independently equipped with a washing liquid outlet and a loaded extraction phase outlet.

[0043] In this invention, the washing liquid can be any washing liquid commonly used in the prior art for washing and extracting lithium, and no specific limitation is made here. The washing liquid storage device can be selected and set according to actual production needs.

[0044] The outlet of the loaded extract phase of the final stage extraction device is connected to the inlet of the loaded extract phase of the first stage washing device.

[0045] The washing liquid outlet of the final stage washing device is connected to the extraction liquid inlet of the first stage extraction device.

[0046] In this invention, during the extraction unit, while lithium ions are removed from the mother liquor, other cations in the mother liquor are also extracted in small quantities. A washing device washes off these other cations from the loaded extraction phase to improve its purity, thereby increasing the purity of lithium in the resulting product. The washing liquid is then reused in the extraction unit for further lithium extraction, thus improving the lithium recovery rate.

[0047] The final stage of the washing device has its loaded extraction phase outlet connected to the inlet of the back-extraction unit.

[0048] As a preferred technical solution of this utility model, the back-extraction unit includes several stages of back-extraction devices connected in series.

[0049] In this invention, the back-extraction device has ≥2 stages. After passing through the back-extraction device, a high-lithium liquid product is obtained, with a lithium extraction rate of over 95%.

[0050] Along the material conveying direction, the first-stage back-extraction device is independently equipped with a back-extraction liquid inlet and a loaded extraction phase inlet; the last-stage back-extraction device is also equipped with an empty extraction phase outlet.

[0051] In this invention, the back-extraction liquid can be the conventional back-extraction liquid used in lithium back-extraction in the prior art, and no specific limitation is made here. The back-extraction liquid storage device can be selected and set according to actual production needs.

[0052] The outlet of the loaded extraction phase of the final stage washing device is connected to the inlet of the loaded extraction phase of the first stage back-extraction device.

[0053] The empty extract phase outlet of the final stage back-extraction device is connected to the extract liquid inlet of the first stage extraction device.

[0054] In this invention, the loaded extractive phase is processed by the back-extraction unit to form an empty extractive phase, which is then returned to the extraction unit for reuse. The loaded extractive phase and the empty extractive phase form a closed-loop cycle, reducing production costs.

[0055] As a preferred technical solution of this utility model, the raffinate post-treatment unit includes several stages of oil separation devices and oil removal devices connected in sequence.

[0056] In this invention, the number of stages of the oil separator is ≥2.

[0057] The outlet of the raffinate from the final stage extraction device is connected to the inlet of the first stage oil separator.

[0058] As a preferred technical solution of this utility model, the oil separating device is an oil separating tank.

[0059] In this invention, an oil separator is used to remove suspended oil from the raffinate.

[0060] The oil removal device is filled with oil-absorbing resin or activated carbon.

[0061] In this invention, an oil removal device is used to remove residual soluble oil from the raffinate.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] (1) The resource recovery device system provided by this utility model, through the coordinated use of a pretreatment unit, conditioning unit, extraction unit, washing unit, back-extraction unit and raffinate post-treatment unit connected in sequence, realizes the maximum recovery and utilization of lithium ions in the mother lithium liquid, reduces the waste of lithium resources, ensures the greenness, stability and controllability of the extraction process, the metal impurity ion content in the obtained high lithium liquid product is low and the lithium extraction rate is high, and the raffinate can meet the discharge standards; the resource recovery device system has a simple structure, low operation difficulty and low manufacturing cost;

[0064] (2) The resource recovery device system provided by this utility model can not only effectively remove calcium and magnesium ions in lithium mother liquor by adding a conditioning unit before extraction, but also further improve the lithium extraction rate and the purity of lithium products. Attached Figure Description

[0065] Figure 1 This is a schematic diagram of the resource recovery device system for lithium precipitation mother liquor provided in Example 1.

[0066] The components are as follows: 100 - Pretreatment unit, 200 - Conditioning unit, 300 - Extraction unit, 400 - Washing unit, 500 - Back-extraction unit, 600 - Residual raffinate post-treatment unit, 1 - Lithium precipitation mother liquor storage device, 110 - Cooling device, 120 - First impurity removal device, 130 - Second impurity removal device, 210 - First pH adjustment device, 220 - Calcium and magnesium removal device, 230 - Second pH adjustment device, 310 - First stage extraction device, 320 - Second stage extraction device, 330 - Third stage extraction device, 410 - First stage washing device, 420 - Second stage washing device, 430 - Third stage washing device, 510 - First stage back-extraction device, 520 - Second stage back-extraction device, 530 - Third stage back-extraction device, 610 - First stage oil separation device, 620 - Second stage oil separation device, 630 - Oil removal device. Detailed Implementation

[0067] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0068] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0069] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0070] In the following examples and comparative examples, the temperature of the lithium precipitation mother liquor after treatment by the cooling device was 25°C; the chelating resin was a styrene macroporous resin containing imine diacetic acid functional groups (Ningbo Zhengguang Resin Co., Ltd.).

[0071] Example 1

[0072] In this embodiment, Li in the lithium precipitation mother liquor + The concentration was 1.45 g / L, K + The concentration was 21.00 g / L, Na +The concentration was 45.30 g / L, Mg 2+ The concentration is 0.0051 g / L, Ca 2+ The concentration is 0.004 g / L, Cl - The concentration was 73.20 g / L, and the CO3²⁻ concentration was 18.90 g / L; the pH value of the lithium precipitation mother liquor was 12.5.

[0073] This embodiment provides a resource recovery device system for lithium precipitation mother liquor (such as...). Figure 1 As shown, the resource recovery device system includes a lithium precipitation mother liquor storage device 1, a pretreatment unit 100, a conditioning unit 200, an extraction unit 300, a washing unit 400, a back-extraction unit 500, and a raffinate post-treatment unit 600.

[0074] Along the material conveying direction, the lithium precipitation mother liquor storage device 1, pretreatment unit 100, conditioning unit 200, extraction unit 300, washing unit 400 and back-extraction unit 500 are connected in sequence through pipelines;

[0075] The pretreatment unit 100 includes a cooling device 110, a first impurity removal device 120, and a second impurity removal device 130 connected in sequence.

[0076] The conditioning unit 200 includes a first pH adjustment device 210, a calcium and magnesium removal device 220, and a second pH adjustment device 230 connected in sequence; the pH values ​​of the lithium precipitation mother liquor after passing through the first pH adjustment device and the second pH adjustment device are 10.5 and 10, respectively.

[0077] The extraction unit 300 includes a first-stage extraction device 310, a second-stage extraction device 320, and a third-stage extraction device 330 connected in sequence. The first-stage extraction device 310 is independently provided with an extract inlet and a conditioned mother liquor inlet. The third-stage extraction device 330 is independently provided with a loaded extract phase outlet and a raffinate outlet. The extract is the composition disclosed in Example 1, paragraph 80 of the specification CN118241039A.

[0078] The washing unit 400 includes a first-stage washing device 410, a second-stage washing device 420, and a third-stage washing device 430 connected in sequence; the first-stage washing device 410 is independently provided with a washing liquid inlet and a loaded extraction phase inlet; the third-stage washing device 430 is independently provided with a washing liquid outlet and a loaded extraction phase outlet; the washing liquid is hydrochloric acid with a concentration of 1.5 mol / L.

[0079] The back-extraction unit 500 includes a first-stage back-extraction device 510, a second-stage back-extraction device 520, and a third-stage back-extraction device 530 connected in sequence. The first-stage back-extraction device 510 is independently provided with a back-extraction liquid inlet and a loaded extraction phase inlet. The third-stage back-extraction device 530 is independently provided with a high-lithium liquid outlet and an empty extraction phase outlet. The back-extraction liquid is hydrochloric acid with a concentration of 5.5 mol / L.

[0080] The raffinate post-treatment unit 600 includes a first-stage oil separator 610, a second-stage oil separator 620, and an oil removal device 630 connected in sequence.

[0081] The inlet of the cooling device 110 is connected to the lithium precipitation mother liquor storage device 1; the first impurity removal device 120 is independently provided with a first outlet and a second outlet; the first outlet is connected to the inlet of the second impurity removal device 130; the second outlet is connected to the lithium precipitation mother liquor storage device 1; the outlet of the second impurity removal device 130 is connected to the inlet of the first pH adjustment device 210.

[0082] The outlet of the second pH adjustment device 230 is connected to the inlet of the conditioned mother liquor of the first extraction device 310; the outlet of the loaded extraction phase of the third extraction device 330 is connected to the inlet of the loaded extraction phase of the first washing device 410; the outlet of the raffinate of the third extraction device 330 is connected to the inlet of the first oil separator 610.

[0083] The washing liquid outlet of the third-stage washing device 430 is connected to the extraction liquid inlet of the first-stage extraction device 310; the loaded extraction phase outlet of the third-stage washing device 430 is connected to the loaded extraction phase inlet of the first-stage back-extraction device 510.

[0084] The empty extraction phase outlet of the third-stage back-extraction unit 530 is connected to the extract inlet of the first-stage extraction unit 310.

[0085] Example 2

[0086] This embodiment provides a resource recovery device system for lithium precipitation mother liquor, which is further defined based on Embodiment 1:

[0087] The first impurity removal device is a plate and frame filter; the second impurity removal device is a security filter; the calcium and magnesium removal device is a continuous ion exchange device; the continuous ion exchange device is filled with chelating resin; the oil separation device is an oil separation tank; the oil removal device is filled with activated carbon.

[0088] The resource recovery device system also includes a water production storage device; the water production storage device is installed on the pipeline connecting the second pH adjustment device and the first-stage extraction device.

[0089] Comparative Example 1

[0090] This comparative example provides a resource recovery device system for lithium precipitation mother liquor. Except for the absence of a first pH adjustment device, all other conditions are the same as in Example 1.

[0091] Comparative Example 2

[0092] This comparative example provides a resource recovery device system for lithium precipitation mother liquor. Except for the absence of a calcium and magnesium removal device, all other conditions are the same as in Example 1.

[0093] Comparative Example 3

[0094] This comparative example provides a resource recovery device system for lithium precipitation mother liquor, which is the same as that in Example 1 except that a conditioning unit is not set up.

[0095] The lithium content, total calcium and magnesium impurity concentrations, and lithium extraction rate in the high-lithium solutions obtained in Example 1 and Comparative Examples 1-3 were tested and calculated. The results are shown in Table 1.

[0096] Table 1

[0097] Example 1 34.51 0.0051 98.50 Comparative Example 1 32.21 0.0082 93.81 Comparative Example 2 33.22 0.025 97.90 Comparative Example 3 36.31 0.024 99.15

[0098] As shown in Table 1:

[0099] (1) The resource recovery device system provided by this utility model, through the coordinated use of a pretreatment unit, a conditioning unit, an extraction unit, a washing unit, a back-extraction unit and a raffinate post-treatment unit connected in sequence, achieves the maximum recovery and utilization of lithium ions in the mother lithium liquid, thereby obtaining a high lithium liquid, which has a low content of metal impurity ions and a high lithium extraction rate, and ensures that the raffinate meets the discharge standards; wherein, the total concentration of calcium and magnesium impurities in the high lithium liquid is less than 0.006 g / L, and the lithium extraction rate is greater than 98%;

[0100] (2) As can be seen from the combined example 1 and comparative example 1, if the first pH adjustment device is not set, the pH value of the adsorption environment in the calcium and magnesium removal device is the pH value of the lithium precipitation mother liquor, which is highly alkaline. There are more free calcium carbonate and magnesium hydroxide, which leads to the blockage of the adsorbent. Ultimately, the calcium and magnesium ion content in the high lithium liquid increases, and the lithium extraction rate also decreases.

[0101] (3) As can be seen from Example 1 and Comparative Example 2, if a calcium and magnesium removal device is not installed, a large amount of calcium and magnesium ion impurities will accumulate in the high lithium liquid, resulting in a decrease in the purity of the product.

[0102] (4) Based on the comprehensive results of Example 1 and Comparative Example 3, if the conditioning unit is not set up, and if the device for adjusting the pH of the lithium precipitation mother liquor and adsorbing calcium and magnesium ions is omitted at the same time, calcium and magnesium ions will be enriched in the high lithium liquid. Furthermore, due to the high alkalinity of the brine, the dissolution rate of the extractant is high, which is nearly 3 times that of Example 1.

[0103] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A resource recovery apparatus system for lithium sink liquor, characterized by, The resource recovery device system includes a lithium precipitation mother liquor storage device, a pretreatment unit, a conditioning unit, an extraction unit, a washing unit, a back-extraction unit, and a raffinate post-treatment unit; Along the material conveying direction, the lithium precipitation mother liquor storage device, pretreatment unit, conditioning unit, extraction unit, washing unit and back-extraction unit are connected in sequence through pipelines; The conditioning unit includes a first pH adjustment device, a calcium and magnesium removal device, and a second pH adjustment device connected in sequence. The outlet of the pretreatment unit is connected to the inlet of the first pH adjustment device; the outlet of the second pH adjustment device is connected to the inlet of the extraction unit. Along the material conveying direction, the last stage of the back-extraction unit is equipped with a high-lithium liquid outlet; The raffinate outlet of the extraction unit is connected to the inlet of the raffinate post-treatment unit.

2. The resource recovery apparatus system of lithium sink solution according to claim 1, characterized in that, The pretreatment unit includes a cooling device, a first impurity removal device, and a second impurity removal device connected in sequence. The inlet of the cooling device is connected to the lithium precipitation mother liquor storage device; The first impurity removal device is independently provided with a first outlet and a second outlet; The first outlet is connected to the inlet of the second impurity removal device; The second outlet is connected to the lithium precipitation mother liquor storage device; The outlet of the second impurity removal device is connected to the inlet of the first pH adjustment device.

3. The resource recovery apparatus system of lithium sink solution according to claim 2, wherein, The first impurity removal device is a plate and frame filter; The second impurity removal device is a security filter or an ultrafiltration membrane module.

4. The lithium sink liquor resource recovery device system of claim 1, wherein, The calcium and magnesium removal device is a continuous electro-ionization device; The continuous ion exchange device is filled with chelating resin.

5. The lithium sink liquor resource recovery device system of claim 1, wherein, The resource recovery device system also includes a water production storage device; The water storage device is installed on the pipeline connecting the second pH adjustment device and the extraction unit.

6. The lithium sink liquor resource recovery apparatus system of claim 1, wherein, The extraction unit comprises several stages of extraction devices connected in series; Along the material conveying direction, the first-stage extraction device is independently equipped with an extract inlet and a conditioned mother liquor inlet; the last-stage extraction device is independently equipped with a loaded extract phase outlet and a raffinate outlet. The outlet of the second pH adjustment device is connected to the inlet of the conditioned mother liquor of the first-stage extraction device; The outlet of the loaded extraction phase of the final stage extraction device is connected to the inlet of the washing unit; The extraction device is a chamber-type extraction tank or a centrifugal extractor.

7. The lithium sink liquor resource recovery apparatus system of claim 1, wherein, The washing unit includes several stages of washing devices connected in series; Along the material conveying direction, the first-stage washing device is independently equipped with a washing liquid inlet and a loaded extraction phase inlet; the last-stage washing device is independently equipped with a washing liquid outlet and a loaded extraction phase outlet. The outlet of the loaded extract phase of the final extraction unit is connected to the inlet of the loaded extract phase of the washing unit described in the first stage; The washing liquid outlet of the final stage washing device is connected to the extraction liquid inlet of the first stage extraction device; The final stage of the washing device has its loaded extraction phase outlet connected to the inlet of the back-extraction unit.

8. The resource recovery device system for lithium precipitation mother liquor according to claim 1, characterized in that, The back-extraction unit includes several stages of back-extraction devices connected in series; Along the material conveying direction, the first-stage back-extraction device is independently equipped with a back-extraction liquid inlet and a loaded extraction phase inlet; the last-stage back-extraction device is also equipped with an empty extraction phase outlet. The outlet of the loaded extract phase of the final stage washing device is connected to the inlet of the loaded extract phase of the first stage back-extraction device; The empty extract phase outlet of the final stage back-extraction device is connected to the extract liquid inlet of the first stage extraction device.

9. The lithium sink liquor resource recovery apparatus system of claim 1, wherein, The raffinate post-treatment unit includes several stages of oil separation devices and oil removal devices connected in sequence. The outlet of the raffinate from the final extraction unit is connected to the inlet of the oil separator from the first stage.

10. The lithium sink liquor resource recovery apparatus system of claim 9, wherein, The oil separator is an oil separator tank; The oil removal device is filled with oil-absorbing resin or activated carbon.

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