A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system

Abstract

The present invention discloses a method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system, comprising: S1. Using Li / Al-LDHs as an adsorbent and filling it in an adsorption device to form an adsorption bed layer, pumping a boron-rich lithium-containing adsorption liquid into the lower end of the adsorption device and passing it through the adsorption bed layer, and then flowing out from the upper end of the adsorption device; S2. After the adsorption is completed, flushing the adsorption bed layer from the upper end of the adsorption device with water; S3. Pumping a boron desorption liquid into the lower end of the adsorption device and passing it through the adsorption bed layer, and then collecting the effluent from the upper end of the adsorption device; S4. Pumping a lithium desorption liquid into the lower end of the adsorption device and passing it through the adsorption bed layer, and then collecting the effluent from the upper end of the adsorption device. The method for synchronous extraction of lithium and boron resources in the boron-rich lithium-containing system of the present invention can achieve the purpose of simultaneously recovering two resources of boron and lithium, and the method has simple operation and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of resource recovery, and particularly relates to a method for simultaneously extracting lithium and boron resources in a boron-rich lithium-containing system. Background Art

[0002] In recent years, with the rapid development of the lithium battery industry and others, lithium resources are considered the foundation of the new energy industry. Similarly, boron and its compounds play an important role in the development of industries such as the chemical industry, metallurgy, agriculture, and medicine. The continuous expansion of the application fields of lithium and boron has led to a sharp increase in the market demand for lithium and boron resources. In the long run, it will be of great significance to improve the ability to simultaneously develop lithium and boron resources to fill the supply chain gap. Lithium and boron resources mostly coexist in industrial wastewater, groundwater, and salt lake brines, such as the wastewater discharged from the nuclear industry, geothermal water, and hot spring water. The content of lithium and boron in these systems is relatively high, and they are important resources with economic value.

[0003] In existing extraction technologies, the industrial methods for extracting lithium include chemical precipitation method, gradient membrane coupling method, solvent extraction method, adsorption-membrane tandem method, etc., and the technologies for extracting boron mainly include acidification crystallization method, precipitation method, flotation method, adsorption method, solvent extraction method, and other methods. The methods for simultaneously extracting lithium and boron resources are mainly the double adsorption method, the method of first precipitating and separating lithium and then extracting boron, etc. Most of these method combinations have long process times and low efficiency. Using one method to simultaneously separate lithium and boron is a research hotspot in the future, such as using an adsorbent with good adsorption performance for both lithium and boron. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for simultaneously extracting lithium and boron resources. This method uses an aluminum salt adsorbent (Li / Al-LDHs) as the raw material for simultaneously extracting lithium and boron resources. After co-adsorbing lithium and boron in a boron-rich lithium-containing system, redistribution desorption is carried out, thereby achieving the purpose of simultaneously recovering the two resources.

[0005] Due to the interlayer ion exchange function and large specific surface area, layered double hydroxides (LDH) have great potential in ion adsorption extraction. Among them, lithium-aluminum layered materials (Li / Al-LDHs), with a chemical formula generally LiCl·mAl(OH)3·nH2O, where m is 2 - 10 and n is 0.5 - 10, have been proven to have strong adsorption selectivity, good adsorption capacity, and good cycle stability.

[0006] In the present invention, the inventor uses Li / Al-LDHs as the adsorbent. Based on the fact that lithium ions can be adsorbed onto the layer board or desorbed from the layer board, B(OH)4 -Based on the principle of mutual replacement and adsorption or desorption with interlayer anions, the lithium-boron resources in the boron-rich lithium-containing system are synchronously adsorbed and extracted. Then, by using two methods of boron-first then lithium (B-Li) and lithium-first then boron (Li-B) to desorb the adsorbed lithium and boron elements, good desorption and extraction effects can be achieved.

[0007] Specifically, in the first aspect of the present invention, a method for synchronous extraction of lithium-boron resources in a boron-rich lithium-containing system (boron-first then lithium B-Li) is provided, including the following steps:

[0008] S1. Fill Li / Al-LDHs as an adsorbent in an adsorption device to form an adsorption bed layer, pump the boron-rich lithium-containing adsorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then flow out from the upper end of the adsorption device;

[0009] S2. After the adsorption is completed, rinse the adsorption bed layer from the upper end of the adsorption device with water;

[0010] S3. Pump the boron desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device;

[0011] S4. Pump the lithium desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device.

[0012] In the second aspect of the present invention, another method for synchronous extraction of lithium-boron resources in a boron-rich lithium-containing system (lithium-first then boron Li-B) is provided, including the following steps:

[0013] S1. Fill Li / Al-LDHs as an adsorbent in an adsorption device to form an adsorption bed layer, pump the boron-rich lithium-containing adsorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then flow out from the upper end of the adsorption device;

[0014] S2. After the adsorption is completed, rinse the adsorption bed layer from the upper end of the adsorption device with water;

[0015] S3. Pump the lithium desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device;

[0016] S4. Pump the boron desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device.

[0017] In step S1 of the present invention, the boron-rich lithium-containing adsorption liquid can be various water bodies containing both boron and lithium elements, such as industrial wastewater, groundwater, and salt lake brine. Taking salt lake brine as an example, it generally contains elements such as calcium, magnesium, boron, and lithium. For the removal of calcium and magnesium, there are relatively mature and perfect processes. After removing calcium and magnesium elements, the brine mainly contains boron and lithium elements, and the method of the present invention can be used for synchronous adsorption and extraction. The boron-rich lithium-containing adsorption liquid of the present invention has no special requirements for the boron content and lithium content. Among them, the boron content is preferably 1-5 g / L, for example, it can be 1 g / L, 2 g / L, 3 g / L, 4 g / L, 5 g / L, or any content between these values; the lithium content is preferably 200-500 ppm, for example, it can be 200 ppm, 250 ppm, 300 ppm, 350 ppm, 400 ppm, 450 ppm, 500 ppm, or any content between these values. In addition, the boron-rich lithium-containing adsorption liquid can be either a high-salt system or a low-salt system, and the salt concentration is preferably 0.1 M-5 M, for example, it can be 0.1 M, 0.2 M, 0.4 M, 0.5 M, 0.8 M, 1.0 M, 1.5 M, 2.0 M, 2.5 M, 3.0 M, 3.5 M, 4.0 M, 4.5 M, 5.0 M, or any concentration between these values.

[0018] In step S1 of the present invention, the adsorption device can be various types of adsorbers, such as resin adsorption columns, fixed-bed adsorbers, etc. In a preferred embodiment, the adsorption device is a fixed-bed adsorber, in which the adsorption bed layer has an adsorption height of 60 cm, a diameter of 2.1 cm, a volume of about 207 mL, and the feed flow rate of the boron-rich lithium-containing adsorption liquid is 1-4 BV / h, for example, it can be 1 BV / h, 2 BV / h, 3 BV / h, 4 BV / h, etc.

[0019] In step S2 of the present invention, the adsorbed adsorption bed layer is washed with water to remove the remaining adsorption liquid between the bed layers. Preferably, deionized water at 0 °C is used for rinsing, which can stabilize the performance of the adsorbent while rinsing. The volume of deionized water is preferably 1-5 times the volume of the adsorption bed layer, more preferably 2 times the volume of the adsorption bed layer; the flow rate is preferably 5.5-50 mL / min.

[0020] In the present invention, the composition of the boron desorption liquid is as follows: the concentration of chloride ions is 2-5 M, and the concentration of lithium ions is 0-200 ppm. This desorption liquid is designed based on the principle that Cl - can displace the borate ions between the adsorbent layers, and generally NaCl is used. The concentration of chloride ions should be as high as possible so that the boron extraction efficiency and performance are better. Through preliminary experimental verification, when the concentration of Cl - is 2-5 M, a better desorption effect can be obtained.

[0021] The object of the present invention is to maximize the recovery of boron and lithium ions separately by means of segmentation. To achieve this object, during each desorption stage, while extracting one ion, it is necessary to inhibit the desorption of the other ion. Therefore, in the present invention, a certain amount of lithium salt can be added to the boron desorption solution to inhibit the desorption of lithium ions.

[0022] In addition, the boron desorption solution needs to be acidic. When the pH is in an acidic condition, boron exists in the form of boric acid, and this form of existence is conducive to the desorption of boron. Preferably, the pH of the boron desorption solution is 2.5 - 6, for example, it can be 2.5, 3, 4, 5, 6, etc. When the pH is greater than 2.5, the structure stability of the adsorbent can be ensured. More preferably, the pH of the boron desorption solution is 4.0.

[0023] The preparation method of the above boron desorption solution is as follows: Add sodium chloride to deionized water and then mix ultrasonically. According to the need, add a small amount of lithium chloride, and adjust the pH value of the solution to be acidic to obtain the desorption solution in this process.

[0024] In the present invention, the desorption time of the boron desorption solution cannot be too long, as too long a time may lead to excessive desorption of lithium (there is also lithium in the adsorbent, resulting in damage to the adsorbent itself). Preferably, the desorption time using the boron desorption solution is 180 min.

[0025] In the present invention, the composition of the lithium desorption solution is as follows: the concentration of lithium ions is 50 - 500 ppm. When desorbing lithium ions, deionized water can be directly used for desorption. However, in order to protect the adsorbent itself from being damaged (preventing the lithium in the adsorbent itself from being desorbed), preferably, a low - concentration lithium solution is used, which can achieve the effect of desorbing lithium while protecting the adsorbent. The lithium desorption solution needs to be alkaline because in the stage of desorbing lithium, in order to maximize the recovery of lithium, it is necessary to inhibit the desorption of boron. When the pH is alkaline, boron exists in the form of borate, and at this time, it is not conducive to the desorption of boron, achieving the desorption of lithium well while inhibiting the desorption of boron. The pH of the lithium desorption solution is preferably 9 - 13, for example, it can be 9, 10, 11, 12, 13, and more preferably 12.

[0026] In the present invention, during the lithium desorption stage, it is necessary to control the temperature of the desorption solution to protect the stability of the adsorbent bed layer and prevent excessive desorption of lithium. Preferably, the temperature of the lithium desorption solution is 40 °C.

[0027] In the present invention, the preparation method of the lithium desorption solution is as follows: Add a small amount of lithium chloride to deionized water and then mix ultrasonically, and adjust the pH value of the solution to be alkaline to obtain the desorption solution in this process.

[0028] Furthermore, the desorption time using the lithium desorption solution to desorb lithium is 180 min.

[0029] In the present invention, the preferred flow rate for the entire desorption process is 2 - 6 BV / h, and more preferably 3 BV / h.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. By using the synchronous extraction method of the present invention, after adsorption in a low-salt system, the adsorption amounts of lithium and boron can both reach 40 mg and 600 mg, and the adsorption effect is excellent; after desorption and extraction by the B-Li method, boron can be 100% extracted at 180 min, and the lithium desorption and extraction rate reaches 72.03% after 360 min; in the Li-B method, lithium can be completely extracted after about 30 min of desorption, and the boron extraction rate is as high as 76.89% at 360 min.

[0032] 2. By using the synchronous extraction method of the present invention, after adsorption in a high-salt system, the adsorption effects of lithium and boron change slightly, but they can reach 80 mg and 400 mg respectively, and the effects are excellent; in the B-Li method, lithium can be completely extracted at 260 min of desorption, and the extraction rate of boron is as high as 91.88% after 6 hours of desorption; in the Li-B method, all lithium and boron can be extracted at 60 min and 360 min respectively.

[0033] 3. The present invention uses an aluminum salt adsorbent (Li / Al-LDHs) to co-adsorb lithium and boron in a boron-rich lithium-containing system, and then uses two different desorption methods to synchronously desorb and extract them to achieve the purpose of simultaneously recovering the two resources. This method is simple to operate, the main raw materials are cheap and easy to obtain, while achieving efficient synchronous extraction to obtain high economic benefits, it can also broaden the application value of the aluminum salt adsorbent (Li / Al-LDHs), which has great significance. Description of the Drawings

[0034] Figure 1 It is the technical solution diagram for Examples 1 - 4;

[0035] Figure 2 For the desorption experiment of the low-salt adsorption system in Example 1, the lithium and boron adsorption breakthrough curves (a) and desorption recovery curves (b) during the process of boron first and then lithium;

[0036] Figure 3 For the desorption experiment of the low-salt adsorption system in Example 2, the lithium and boron adsorption breakthrough curves (a) and desorption recovery curves (b) during the process of lithium first and then boron;

[0037] Figure 4 For the desorption experiment of the high-salt adsorption system in Example 3, the lithium and boron adsorption breakthrough curves (a) and desorption recovery curves (b) during the process of boron first and then lithium;

[0038] Figure 5For the desorption experiment of the high-salt adsorption system in Example 4, during the process of lithium first and then boron, the lithium-boron adsorption breakthrough curve (a) and desorption recovery rate curve (b). Detailed implementation manners

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the exemplified embodiments are not intended to limit the present invention.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] Unless otherwise specified, the experimental methods used in the following embodiments are all conventional methods, and the materials, reagents, etc. used, unless otherwise specified, can be obtained from commercial channels.

[0042] In the following embodiments, the boron-rich lithium-containing system is self-made in the laboratory, and its main components are sodium tetraborate decahydrate, sodium chloride and lithium chloride.

[0043] Example 1

[0044] For the low-salt lithium-boron adsorption system, when the experimental idea of boron first and then lithium is adopted in this embodiment, the whole operation includes the following steps:

[0045] (1) Low-salt system adsorption: Using a low-salt adsorption solution with a chloride ion concentration of 0.5 M, a boron ion concentration of 1500 ppm, and a lithium ion concentration of 300 ppm, according to Figure 1 the shown process, it flows in from the bottom end of the bed, flows out from the top end and samples are taken, and the adsorption process lasts for 2 hours. The whole process is carried out at room temperature, and a total of 48.175 mg of lithium ions and 620.25 mg of boron ions are adsorbed;

[0046] (2) Water washing: Using deionized water at 0 °C, according to Figure 1 the shown method, it is introduced into the bed from the top for flushing, and a total of 2 bed volumes are fed;

[0047] (3) Full-process desorption of boron first and then lithium: According to Figure 1 the shown method, the desorbing solution is introduced from the bottom end and desorption is carried out in two stages. In the first stage, 5 M NaCl, Li +The desorbing solution with a concentration of 100 ppm and a solution pH of 4.0 is doped with lithium in this desorption stage to inhibit the desorption of lithium ions considering the further recovery of lithium in the subsequent stage. The feed flow rate is 3 BV / h and the total feeding time is 180 min. Effluent samples are taken at different feeding times. In the second stage, Li + A lithium chloride solution with a concentration of 100 ppm and a solution pH of 11.0 is used as the desorbing solution, and the temperature of the desorption process in this stage is controlled at 40 °C for a total of 180 min. Samples are taken at different time points.

[0048] The desorption recovery rate of the entire desorption process is as Figure 2 shown. In the first desorption stage, a large amount of boron ions are desorbed and recovered, and the desorption rate can reach as high as 88.99% at 180 min. During the lithium recovery process in the second stage, the final desorption rate of lithium ions is as high as 72.03%. Looking at the whole process, around 180 min of desorption, boron ions can be completely desorbed, and theoretically, as the desorption time increases, lithium can also be completely desorbed.

[0049] Example 2

[0050] For the low-salt lithium-boron adsorption system, when the experimental idea of "lithium first and then boron" is adopted in this example, the whole operation includes the following steps:

[0051] (1) Low-salt system adsorption: A low-salt adsorption solution with a chloride ion concentration of 0.5 M, a boron ion concentration of 1500 ppm, and a lithium ion concentration of 300 ppm is used. According to the Figure 1 shown process, it flows in from the bottom of the bed, flows out from the top and samples are taken, and the adsorption process lasts for 2 hours. The whole process is carried out at room temperature, and a total of 81.85 mg of lithium ions and 651.2 mg of boron ions are adsorbed;

[0052] (2) Water washing: Deionized water at 0 °C is used to flush the bed from the top according to the Figure 1 shown method, and a total of 2 bed volumes are fed;

[0053] (3) Whole-process desorption of lithium first and then boron: According to the Figure 1 shown method, the desorbing solution is fed in from the bottom and desorption is carried out in two stages. In the first stage, as much lithium ions as possible are desorbed (inhibiting the desorption of boron). A lithium chloride solution with 100 ppm Li + and a solution pH of 12.0 is used as the desorbing liquid, the feed flow rate is 3 BV / h, and the temperature is controlled at 40 °C while feeding from the bottom; in the second stage, boron is desorbed (inhibiting the desorption of lithium). A 5 M NaCl solution with a pH of 4.0 is used. It should be noted that the high Cl - solution here does not contain Li + . The feed flow rate and method remain unchanged, and the total feeding time is 180 min. Samples are taken at different time points.

[0054] After comprehensively analyzing the desorption recovery rates of the two-stage desorption process, the results are as Figure 3 shown. In the first desorption stage, 100% desorption of lithium ions can be achieved in about 30 minutes, reaching the expected goal. Entering the second stage, lithium ions are hardly desorbed, while boron ions are in the stage of massive desorption. When the desorption duration reaches 360 minutes, the extraction rate of boron desorption is as high as 76.89%. It can be considered that as the desorption time increases, boron ions can be completely desorbed.

[0055] Example 3

[0056] For the high-salt lithium-boron adsorption system, when the experimental idea of boron first and then lithium is adopted in this example, the whole operation includes the following steps:

[0057] (1) Adsorption of high-salt system: Using a low-salt adsorption solution with a chloride ion concentration of 2.0 M, a boron ion concentration of 1500 ppm, and a lithium ion concentration of 300 ppm, flowing in from the bottom of the bed layer according to the Figure 1 shown process, flowing out from the top and sampling, and conducting an adsorption process for 2 hours. The whole process is carried out at room temperature, and a total of 82.975 mg of lithium ions and 436.875 mg of boron ions are adsorbed;

[0058] (2) Water washing: Using deionized water at 0 °C to flush the bed layer from the top according to the Figure 1 shown method, and a total of 2 bed volumes of feed are introduced;

[0059] (3) Desorption of the whole process of boron first and then lithium: According to the Figure 1 shown method, introducing the desorbing solution from the bottom and carrying out desorption in two stages. In the first stage, using a desorbing solution with 5 M NaCl, a Li + concentration of 100 ppm, and a solution pH of 4.0. Considering that lithium will be further recovered in the subsequent stage, lithium is added to the desorbing solution in this stage to inhibit the desorption of lithium ions. The feed flow rate is 3 BV / h, and the total liquid is fed for 180 minutes, and samples are taken at different feed times. In the second stage, using a lithium chloride solution with a Li + concentration of 100 ppm and a solution pH of 12.0 as the desorbing solution, and controlling the temperature of the desorption process in this stage at 40 °C, with a total of 180 minutes, and sampling at different time points.

[0060] The desorption recovery rates of the whole desorption process are as Figure 4 shown. In the first stage, boron is massively desorbed in this stage, and the desorption rate can reach as high as 91.88% at 180 minutes. In the second stage, at this time, lithium is mainly desorbed. When the desorption duration reaches 250 minutes, lithium is completely desorbed, and boron is still in the desorption process at this time. Looking at the whole process, theoretically, as the desorption time increases, boron can also be completely desorbed.

[0061] Example 4

[0062] For a high-salt lithium-boron adsorption system, when adopting the experimental idea of lithium first and then boron, the whole operation includes the following steps:

[0063] (1) Adsorption in high-salt system: Using a low-salt adsorption solution with a chloride ion concentration of 2.0 M, a boron ion concentration of 1500 ppm, and a lithium ion concentration of 300 ppm, according to the Figure 1 shown process, it flows in from the bottom of the bed, flows out from the top and samples are taken, and an adsorption process lasting for 2 hours is carried out. The whole process is carried out at room temperature, and a total of 85.23 mg of lithium ions and 478.98 mg of boron ions are adsorbed;

[0064] (2) Water washing: Using deionized water at 0 °C, according to the Figure 1 shown method, it is introduced into the bed from the top for flushing, and a total of 2 bed volumes are fed;

[0065] (3) Desorption of the whole process of lithium first and then boron: According to the Figure 1 shown method, the desorbing solution is introduced from the bottom and desorption is carried out in two stages. In the first stage, as much lithium ion as possible is desorbed (inhibiting the desorption of boron), using a lithium chloride solution with 100 ppm Li + , a solution pH of 12.0 as the desorbing liquid, the feed flow rate is 3 BV / h, and the temperature is controlled at 40 °C while feeding from the bottom; in the second stage, boron is desorbed (inhibiting the desorption of lithium), using a 5 M NaCl solution with a pH of 4.0. It should be noted that the high Cl - solution does not contain Li + . The feed flow rate and method remain unchanged, and a total of 180 min is carried out, and samples are taken at different time points.

[0066] After comprehensively analyzing the desorption recovery rates of the desorption processes in the two stages, the results are as Figure 5 shown. During the desorption of lithium in the first stage, about 40 min is required to achieve 100% desorption of lithium, and at this time, only about 5% of boron is desorbed, achieving the expected purpose. As the desorption process proceeds, by the end of the first stage, the boron desorption rate is only about 25%. When entering the second stage, lithium is basically not desorbed, and at this time, boron is in a large desorption process. By the time of desorption for 300 min, boron has been completely desorbed.

[0067] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system, characterized in that, It includes the following steps: S1. Use Li / Al-LDHs as an adsorbent to fill an adsorption device to form an adsorption bed layer. Pump the boron-rich lithium-containing adsorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then flow out from the upper end of the adsorption device. S2. After the adsorption ends, rinse the adsorption bed layer with water from the upper end of the adsorption device. S3. Pump the boron desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device. The composition of the boron desorption liquid is as follows: the concentration of chloride ions is 2 - 5M, the concentration of lithium ions is 100 - 200 ppm, and the pH is 2.5 - 6. S4. Pump the lithium desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device. The composition of the lithium desorption liquid is as follows: the concentration of lithium ions is 50 - 500 ppm, and the pH is 9 - 13.

2. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system, characterized in that, It includes the following steps: S1. Use Li / Al-LDHs as an adsorbent to fill an adsorption device to form an adsorption bed layer. Pump the boron-rich lithium-containing adsorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then flow out from the upper end of the adsorption device. S2. After the adsorption ends, rinse the adsorption bed layer with water from the upper end of the adsorption device. S3. Pump the lithium desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device. The composition of the lithium desorption liquid is as follows: the concentration of lithium ions is 50 - 500 ppm, and the pH is 9 - 13. S4. Pump the boron desorption liquid into the adsorption device from the lower end and pass it through the adsorption bed layer, and then collect the effluent from the upper end of the adsorption device. The composition of the boron desorption liquid is as follows: the concentration of chloride ions is 2 - 5M, the concentration of lithium ions is 100 - 200 ppm, and the pH is 2.5 - 6.

3. A method for synchronously extracting lithium and boron resources in a boron-rich lithium-containing system according to claim 1 or 2, characterized in that, In step S1, the composition of the boron-rich lithium-containing adsorption liquid is as follows: the boron content is 1 - 5 g / L, and the lithium content is 200 - 500 ppm.

4. A method for synchronously extracting lithium and boron resources in a boron-rich lithium-containing system according to claim 1 or 2, characterized in that, In step S1, the adsorption device is a fixed bed, and the feed flow rate of the boron-rich lithium-containing adsorption liquid is 1 - 4 BV / h.

5. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system according to claim 1, characterized in that In step S2, the water is deionized water at 0 °C, the volume is 1 - 5 times the volume of the adsorption bed layer, and the flow rate is 5.5 - 50 mL / min.

6. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system according to claim 1 or 2, characterized in that, The desorption time using the boron desorption liquid is 180 min.

7. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system according to claim 1 or 2, characterized in that The temperature of the lithium desorption liquid is 40 °C.

8. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system according to claim 7, characterized in that, The desorption time of lithium using the lithium desorption liquid is 180 min.

9. A method for synchronous extraction of lithium and boron resources in a boron-rich lithium-containing system according to claim 1 or 2, characterized in that In steps S3 and S4, the flow rate of the boron desorption liquid / lithium desorption liquid is 2 - 6 BV / h.

Images