Valve array structure and salt lake lithium extraction resin system applying same

Abstract

The invention discloses a valve array structure and a salt lake lithium extraction resin system applying the valve array structure.The valve array structure comprises a first common pipe and a second common pipe, and the first common pipe is connected with a brine feeding branch pipe, a tail brine discharging branch pipe, an analytic water feeding branch pipe and a leaching water feeding branch pipe; the second common pipe is connected with a brine discharging branch pipe, a tail brine feeding branch pipe, an analytic water discharging branch pipe and a leaching water discharging branch pipe; the brine feeding branch pipe, the tail brine discharging branch pipe, the desorbed water feeding branch pipe, the leaching water feeding branch pipe, the brine discharging branch pipe, the tail brine feeding branch pipe, the desorbed water discharging branch pipe, the leaching water discharging branch pipe, the first communicating pipe and the second communicating pipe are respectively provided with an automatic valve. According to the valve array structure, the number and combination of the resin beds in series-parallel operation can be rapidly adjusted, and the defects of a traditional valve array type resin bed are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium extraction from salt lakes, and particularly relates to a valve array structure and a salt lake lithium extraction resin system applying the valve array structure. Background Art

[0002] The lithium extraction technology with titanium adsorption resin is a method for extracting lithium from salt lake brine by using titanium-based adsorbents, which has the advantages of high selectivity, large adsorption capacity, high stability, etc. Compared with traditional methods, it can obtain higher lithium extraction efficiency. During industrial lithium extraction, especially for lithium extraction from salt lakes, a large number of titanium adsorption resin beds are required. The resin beds generally go through multiple processes such as adsorption and desorption. If the adsorption and desorption processes are not thorough, it will lead to low lithium extraction efficiency; if multi-stage adsorption is adopted, the number of resin beds needs to be increased, resulting in an increase in project investment. When the number of resin beds is large, the operation control is extremely cumbersome, with extremely high technical requirements for operators, and it is difficult to flexibly adjust the combined number and efficiency of resin beds in each operation state stage; overall, it is difficult to significantly improve the lithium extraction efficiency and lithium recovery rate. Summary of the Invention

[0003] Therefore, the present invention provides a valve array structure and a salt lake lithium extraction resin system applying the valve array structure to solve the problems in the prior art that during the process of lithium extraction from salt lakes, the series and parallel control operations of each operation stage of the titanium adsorption resin unit and each stage of resin beds are complex and have a high error rate, resulting in difficulty in significantly improving the lithium extraction efficiency and lithium extraction rate, so as to save costs and improve efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The first aspect of the present invention provides a valve array structure, which includes a first common pipe, a second common pipe, a first connecting pipe, a second connecting pipe, and a third connecting pipe. A brine feed branch pipe, a tail brine discharge branch pipe, a desorption water feed branch pipe, and a washing water feed branch pipe are connected to the first common pipe. A brine discharge branch pipe, a tail brine feed branch pipe, a desorption water discharge branch pipe, and a washing water discharge branch pipe are connected to the second common pipe. Two ends of the first connecting pipe are respectively connected to the first common pipe and the second common pipe. The second connecting pipe and the third connecting pipe are in parallel. The other end of the second connecting pipe is used to connect the first common pipe of other valve array structures, and the other end of the third connecting pipe is used to connect the second common pipe of other valve array structures. A brine feed automatic valve, a tail brine discharge automatic valve, a desorption water feed automatic valve, a washing water feed automatic valve, a brine discharge automatic valve, a tail brine feed automatic valve, a desorption water discharge automatic valve, a washing water discharge automatic valve, a body connection automatic valve, and a series connection automatic valve are respectively and correspondingly arranged on the brine feed branch pipe, the tail brine discharge branch pipe, the desorption water feed branch pipe, the washing water feed branch pipe, the brine discharge branch pipe, the tail brine feed branch pipe, the desorption water discharge branch pipe, the washing water discharge branch pipe, the first connecting pipe, and the second connecting pipe.

[0006] In a second aspect of the present invention, a lithium extraction resin system for salt lakes is provided, which includes a controller and at least four sets of lithium extraction resin units for salt lakes. Each lithium extraction resin unit for salt lakes includes a resin bed and the valve array structure provided in the first aspect of the present invention. One end of the first common pipe is connected to the top material inlet / outlet of the resin bed, and one ends of the second communication pipe and the third communication pipe are connected in parallel to the bottom material inlet / outlet of the resin bed. The other end of the second communication pipe is connected to the first common pipe in the next set of lithium extraction resin units for salt lakes, and the other end of the third communication pipe is connected to the second common pipe in the next two sets of lithium extraction resin units for salt lakes. The controller is used to control the opening and closing of each automatic valve in each valve array structure, so as to control the four sets of lithium extraction resin units for salt lakes to perform adsorption, tail brine backwashing, desorption, and rinsing processes respectively in a one-to-one correspondence, and control each set of lithium extraction resin units for salt lakes to sequentially cycle and change according to the technological steps of adsorption - tail brine backwashing - desorption - rinsing.

[0007] Further, the lithium extraction resin system for salt lakes further includes a feeding and discharging pipeline, which includes a total brine feeding pipeline, a total tail brine discharging pipeline, a total desorbed water feeding pipeline, a total rinsing water feeding pipeline, a total brine discharging pipeline, a total tail brine feeding pipeline, a total desorbed water discharging pipeline, and a total rinsing water discharging pipeline. The brine feeding branch pipe, tail brine discharging branch pipe, desorbed water feeding branch pipe, rinsing water feeding branch pipe, brine discharging branch pipe, tail brine feeding branch pipe, desorbed water discharging branch pipe, and rinsing water discharging branch pipe of each valve array structure are respectively connected to the total brine feeding pipeline, total tail brine discharging pipeline, total desorbed water feeding pipeline, total rinsing water feeding pipeline, total brine discharging pipeline, total tail brine feeding pipeline, total desorbed water discharging pipeline, and total rinsing water discharging pipeline in a one-to-one correspondence.

[0008] Further, the lithium extraction resin system for salt lakes further includes a pumping unit, which includes a brine feeding pump, a desorbed water feeding pump, a rinsing water feeding pump, and a tail brine feeding pump. The brine feeding pump, desorbed water feeding pump, rinsing water feeding pump, and tail brine feeding pump are respectively installed at one ends of the total brine feeding pipeline, total desorbed water feeding pipeline, total rinsing water feeding pipeline, and total tail brine feeding pipeline in a one-to-one correspondence.

[0009] Further, the total brine discharging pipeline, total desorbed water discharging pipeline, total rinsing water discharging pipeline, and total tail brine discharging pipeline are respectively connected to a resin catcher of a tail brine tank, a heat exchanger, a three-stage nanofiltration concentrated water tank, and an intermediate water tank in a one-to-one correspondence.

[0010] Further, at least 5 sets of the lake lithium extraction resin units are provided, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, adsorption, tail brine top water, desorption, and elution processes respectively. Among them, the first set and the second set of salt lake lithium extraction resin units are in series adsorption; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, adsorption, desorption, and elution processes respectively. Among them, the first set and the third set of salt lake lithium extraction resin units are in series adsorption.

[0011] Further, at least 5 sets of the lake lithium extraction resin units are provided, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, tail brine top water, desorption, and elution processes respectively. Among them, the second set and the third set of salt lake lithium extraction resin units are in series tail brine top water; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, desorption, tail brine top water, and elution processes respectively. Among them, the second set and the fourth set of salt lake lithium extraction resin units are in series tail brine top water.

[0012] Further, at least 5 sets of the lake lithium extraction resin units are provided, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, desorption, desorption, and elution processes respectively. Among them, the third set and the fourth set of salt lake lithium extraction resin units are in series desorption; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, desorption, elution, and desorption processes respectively. Among them, the third set and the fifth set of salt lake lithium extraction resin units are in series desorption.

[0013] Further, at least 5 sets of the lake lithium extraction resin units are provided, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, desorption, elution, and elution processes respectively. Among them, the fourth set and the fifth set of salt lake lithium extraction resin units are in series elution; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform tail brine top water, desorption, elution, adsorption, and elution processes respectively. Among them, the third set and the fifth set of salt lake lithium extraction resin units are in series elution.

[0014] The present invention has the following advantages:

[0015] 1. The valve array structure of the present invention for invention patent can quickly adjust the number and combination of resin beds operating in series and parallel, making up for the deficiencies of traditional valve array type resin beds; using the controller for grouped control, the operation is simple and the error rate is low.

[0016] 2. Each resin bed is respectively equipped with a set of valve array structures. Under the control of the controller, each resin bed automatically completes the processes of adsorption (adsorbing lithium ions from the salt lake brine onto the resin to separate lithium ions from the brine), backwashing with tail brine (washing the residual tail brine on the resin surface through reverse flow to remove various ions such as sodium, magnesium, potassium, and chloride ions adhered to the resin surface in the brine, preventing these ions from entering the qualified eluate after the next elution process and improving the purity of lithium ions in the qualified eluate), elution (eluting the lithium ions adsorbed on the resin into the qualified eluate to achieve the extraction and concentration of lithium ions), and rinsing (rinsing the residual lithium ions after elution on the resin surface to improve the recovery rate). This reduces manual operation errors and improves the operation efficiency.

[0017] 3. Adjacent resin beds are connected by a second connecting pipe. By opening the series connection automatic valve on the second connecting pipe, the series connection of adjacent resin beds is realized, and the multi-stage series operation of adjacent resin beds can be achieved according to actual needs; a first connecting pipe is arranged between the first common pipe and the second common pipe. By opening the body connection automatic valve arranged on the first connecting pipe, the multi-stage series operation of non-adjacent resin beds can be realized; the series-parallel operation of several salt lake lithium extraction resin units can be adjusted to achieve multi-stage adsorption and improve the lithium recovery rate; multi-stage backwashing with tail brine can be achieved to improve the purity of lithium ions in the qualified eluate; multi-stage elution can be realized to achieve the multi-stage extraction and concentration of lithium ions. Multi-stage rinsing can be realized to reduce the residual lithium ions after elution on the resin surface and improve the recovery rate.

[0018] 4. According to the lithium extraction adsorption treatment requirements, by operating the corresponding automatic valves through the controller, the number of resin beds in different operating states (a total of four operating states, namely adsorption, backwashing with tail brine, elution, and rinsing) can be flexibly adjusted, reducing the total amount of resin beds invested and saving investment costs; a pumping unit and a feeding and discharging pipeline are used to supply materials to several salt lake lithium extraction resin units, making the best use of common equipment and reducing investment.

[0019] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained by referring to the provided drawings.

[0021] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0022] Figure 1 It is a schematic structural diagram of a valve array structure provided by an embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of a salt lake lithium extraction resin system (including 4 sets of salt lake lithium extraction resin units) provided by an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the working state of a salt lake lithium extraction resin system at a certain moment provided by an embodiment of the present invention;

[0025] Figure 4 It is a schematic structural diagram of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) provided by an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the working state of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) at a certain moment provided by an embodiment of the present invention (the first and second sets of salt lake lithium extraction resin units are in series adsorption);

[0027] Figure 6 It is a schematic diagram of the working state of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) at a certain moment provided by an embodiment of the present invention (the first and third sets of salt lake lithium extraction resin units are in series adsorption);

[0028] Figure 7 It is a schematic diagram of the working state of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) at a certain moment provided by an embodiment of the present invention (the second and third sets of salt lake lithium extraction resin units are in series with tail brine flushing the top water);

[0029] Figure 8 It is a schematic diagram of the working state of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) at a certain moment provided by an embodiment of the present invention (the second and fourth sets of salt lake lithium extraction resin units are in series with tail brine flushing the top water);

[0030] Figure 9 It is a schematic diagram of the working state of a salt lake lithium extraction resin system (including 5 sets of salt lake lithium extraction resin units) at a certain moment provided by an embodiment of the present invention (the third and fourth sets of salt lake lithium extraction resin units are in series desorption);

[0031] Figure 10 Schematic diagram of the working state of a lithium extraction resin system from salt lakes (including 5 sets of lithium extraction resin units from salt lakes) provided by an embodiment of the present invention at a certain moment (the third and fifth sets of lithium extraction resin units from salt lakes are in series for desorption);

[0032] Figure 11 Schematic diagram of the working state of a lithium extraction resin system from salt lakes (including 5 sets of lithium extraction resin units from salt lakes) provided by an embodiment of the present invention at a certain moment (the fourth and fifth sets of lithium extraction resin units from salt lakes are in series for elution);

[0033] Figure 12 Schematic diagram of the working state of a lithium extraction resin system from salt lakes (including 5 sets of lithium extraction resin units from salt lakes) provided by an embodiment of the present invention at a certain moment (the third and fifth sets of lithium extraction resin units from salt lakes are in series for adsorption);

[0034] Figure 13 Schematic diagram of the working state of a lithium extraction resin system from salt lakes (including 18 sets of lithium extraction resin units from salt lakes) at time T1 provided by an embodiment of the present invention;

[0035] Figure 14 Schematic diagram of the working state of a lithium extraction resin system from salt lakes (including 18 sets of lithium extraction resin units from salt lakes) at time T2 provided by an embodiment of the present invention.

[0036] In the figure: 100, resin bed; 200, valve array structure; 201, first common pipe; 202, second common pipe; 203, first connecting pipe; 204, second connecting pipe; 205, third connecting pipe; 206, brine feed branch pipe; 207, tail brine discharge branch pipe; 208, desorption water feed branch pipe; 209, elution water feed branch pipe; 210, brine discharge branch pipe; 211, tail brine feed branch pipe; 212, desorption water discharge branch pipe; 213, elution water discharge branch pipe; 214, brine feed automatic valve; 215, tail brine discharge automatic valve; 216, desorption water feed automatic valve; 217, elution water feed automatic valve; 218, brine discharge automatic valve; 219, tail brine feed automatic valve; 220, desorption water discharge automatic valve; 221, elution water discharge automatic valve; 222, body connection automatic valve; 223, series connection automatic valve; 301, brine feed main pipe; 302, tail brine discharge main pipe; 303, desorption water feed main pipe; 304, elution water feed main pipe; 305, brine discharge main pipe; 306, tail brine feed main pipe; 307, desorption water discharge main pipe; 308, elution water discharge main pipe; 309, tail brine tank resin catcher; 310, heat exchanger; 311, tertiary nanofiltration concentrated water tank; 312, intermediate water tank; 401, brine feed pump; 402, desorption water feed pump; 403, elution water feed pump; 404, tail brine feed pump. Detailed implementation manners

[0037] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0038] As Figure 1 shown, this embodiment provides a valve array structure 200, which includes a first common pipe 201, a second common pipe 202, a first connecting pipe 203, a second connecting pipe 204, and a third connecting pipe 205. A brine feed branch pipe 206, a tail brine discharge branch pipe 207, an analytical water feed branch pipe 208, and a flushing water feed branch pipe 209 are connected to the first common pipe 201. A brine discharge branch pipe 210, a tail brine feed branch pipe 211, an analytical water discharge branch pipe 212, and a flushing water discharge branch pipe 213 are connected to the second common pipe 202. Two ends of the first connecting pipe 203 are respectively connected to the first common pipe 201 and the second common pipe 202. The second connecting pipe 204 and the third connecting pipe 205 are in parallel. The other end of the second connecting pipe 204 is used to connect the first common pipe 201 of other valve array structures 200, and the other end of the third connecting pipe 205 is used to connect the second common pipe 202 of other valve array structures 200. A brine feed automatic valve 214, a tail brine discharge automatic valve 215, an analytical water feed automatic valve 216, a flushing water feed automatic valve 217, a brine discharge automatic valve 218, a tail brine feed automatic valve 219, an analytical water discharge automatic valve 220, a flushing water discharge automatic valve 221, a body connection automatic valve 222, and a series connection automatic valve 223 are respectively and correspondingly arranged on the brine feed branch pipe 206, the tail brine discharge branch pipe 207, the analytical water feed branch pipe 208, the flushing water feed branch pipe 209, the brine discharge branch pipe 210, the tail brine feed branch pipe 211, the analytical water discharge branch pipe 212, the flushing water discharge branch pipe 213, the first connecting pipe 203, and the second connecting pipe 204.

[0039] As Figures 2 - 14 shown, this embodiment also provides a lithium extraction from salt lake resin system, which is a specific application of the valve array structure 200 provided in the above embodiment.

[0040] As Figure 2 and Figure 3As shown in the figure, the lithium extraction resin system from salt lakes includes a controller (omitted and not shown) and at least 4 sets of lithium extraction resin units from salt lakes. Each lithium extraction resin unit from salt lakes includes a resin bed 100 and the valve array structure 200 provided in the above embodiments. One end of the first common pipe 201 is connected to the top material inlet and outlet of the resin bed 100. One ends of the second connecting pipe 204 and the third connecting pipe 205 are connected in parallel and then connected to the bottom material inlet and outlet of the resin bed 100. The other end of the second connecting pipe 204 is connected to the first common pipe 201 in the next set of lithium extraction resin units from salt lakes. The other end of the third connecting pipe 205 is connected to the second common pipe 202 in the second next set of lithium extraction resin units from salt lakes. The controller is used to control the opening and closing of each automatic valve in each valve array structure 200, so as to control the 4 sets of lithium extraction resin units from salt lakes to perform the adsorption, tail brine top water, desorption, and elution processes respectively in a one-to-one correspondence, and control each set of lithium extraction resin units from salt lakes to sequentially cycle and change according to the technological steps of adsorption - tail brine top water - desorption - elution. Among them, the third connecting pipe 205 in the 3# lithium extraction resin unit from salt lakes is connected to the second common pipe 202 in the 1# lithium extraction resin unit from salt lakes, and the third connecting pipe 205 in the 4# lithium extraction resin unit from salt lakes is connected to the second common pipe 202 in the 2# lithium extraction resin unit from salt lakes.

[0041] Figure 3 The figure shows a schematic diagram of 4 sets of lithium extraction resin units from salt lakes performing adsorption, tail brine top water, desorption, and elution respectively in a one-to-one correspondence. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0042] Refer to Figure 3 As shown in the figure: In the 1# lithium extraction resin unit from salt lakes, adsorption is performed, only the brine feed automatic valve 214 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed; in the 2# lithium extraction resin unit from salt lakes, tail brine top water is performed, only the tail brine discharge automatic valve 215 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; in the 3# lithium extraction resin unit from salt lakes, desorption is performed, only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; in the 4# lithium extraction resin unit from salt lakes, elution is performed, only the elution water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0043] After the 4 sets of resin units for extracting lithium from salt lakes have been operating for a period of time T (for example, T = 60 s, which can also be set to other durations), the controller controls each set of resin units for extracting lithium from salt lakes to sequentially cycle and change according to the technological steps of adsorption - backwashing with tail brine - desorption - rinsing. After the change: adsorption is carried out in the 4# resin unit for extracting lithium from salt lakes, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; backwashing with tail brine is carried out in the 1# resin unit for extracting lithium from salt lakes, only the tail brine discharge automatic valve 215 and the rinsing water discharge automatic valve 221 are opened, and other automatic valves are closed; desorption is carried out in the 2# resin unit for extracting lithium from salt lakes, only the desorbed water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; rinsing is carried out in the 3# resin unit for extracting lithium from salt lakes, only the rinsing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0044] The controller controls each set of resin units for extracting lithium from salt lakes to sequentially cycle and change according to the technological steps of adsorption - backwashing with tail brine - desorption - rinsing. After operating for 4T, it will return to the working state shown in Figure 3, and so on in cycles, continuously carrying out the processes of adsorption, backwashing with tail brine, desorption, and rinsing in the resin units for extracting lithium from salt lakes.

[0045] In this embodiment, the resin system for extracting lithium from salt lakes further includes a supply and discharge pipeline. The supply and discharge pipeline includes a brine feed main pipe 301, a tail brine discharge main pipe 302, a desorbed water feed main pipe 303, a rinsing water feed main pipe 304, a brine discharge main pipe 305, a tail brine feed main pipe 306, a desorbed water discharge main pipe 307, and a rinsing water discharge main pipe 308. The brine feed branch pipe 206, the tail brine discharge branch pipe 207, the desorbed water feed branch pipe 208, the rinsing water feed branch pipe 209, the brine discharge branch pipe 210, the tail brine feed branch pipe 211, the desorbed water discharge branch pipe 212, and the rinsing water discharge branch pipe 213 of each valve array structure 200 are respectively and correspondingly connected to the brine feed main pipe 301, the tail brine discharge main pipe 302, the desorbed water feed main pipe 303, the rinsing water feed main pipe 304, the brine discharge main pipe 305, the tail brine feed main pipe 306, the desorbed water discharge main pipe 307, and the rinsing water discharge main pipe 308.

[0046] In this embodiment, the resin system for extracting lithium from salt lakes further includes a pumping unit. The pumping unit includes a brine feed pump 401, a desorbed water feed pump 402, a rinsing water feed pump 403, and a tail brine feed pump 404. The brine feed pump 401, the desorbed water feed pump 402, the rinsing water feed pump 403, and the tail brine feed pump 404 are respectively and correspondingly installed at one ends of the brine feed main pipe 301, the desorbed water feed main pipe 303, the rinsing water feed main pipe 304, and the tail brine feed main pipe 306.

[0047] In this embodiment, the brine discharge main pipe 305, the stripping water discharge main pipe 307, the washing water discharge main pipe 308, and the tail brine discharge main pipe 302 are respectively connected to the tail brine tank resin trap 309, the heat exchanger 310, the tertiary nanofiltration concentrated water tank 311, and the intermediate water tank 312 in one-to-one correspondence.

[0048] Exemplarily, as Figures 4 - 6 shown, there are at least 5 sets of lake lithium extraction resin units, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, adsorption, tail brine backwashing, stripping, and washing processes respectively. Among them, the first and second sets of salt lake lithium extraction resin units are in series adsorption; alternatively, the controller is used to control the 5 sets of salt lake lithium extraction resin units to perform adsorption, tail brine backwashing, adsorption, stripping, and washing processes respectively. Among them, the first and third sets of salt lake lithium extraction resin units are in series adsorption. In Figure 4 , the third connecting pipe 205 in the 4# salt lake lithium extraction resin unit is connected to the second common pipe 202 in the 1# salt lake lithium extraction resin unit, and the third connecting pipe 205 in the 5# salt lake lithium extraction resin unit is connected to the second common pipe 202 in the 2# salt lake lithium extraction resin unit.

[0049] Figure 5 shows a schematic diagram of the 5 sets of salt lake lithium extraction resin units performing adsorption, adsorption, tail brine backwashing, stripping, and washing in one-to-one correspondence. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0050] Refer to Figure 5 shown: Adsorption is carried out in the 1# salt lake lithium extraction resin unit, only the brine feed automatic valve 214 and the stripping water discharge automatic valve 220 are opened, and other automatic valves are closed; Adsorption is carried out in the 2# salt lake lithium extraction resin unit, only the series connection automatic valve 223 and the washing water discharge automatic valve 221 are opened, and other automatic valves are closed. The resin bed 100 in the 2# salt lake lithium extraction resin unit is in series with the resin bed 100 in the 1# salt lake lithium extraction resin unit to achieve multi-stage adsorption; Tail brine backwashing is carried out in the 3# salt lake lithium extraction resin unit, only the tail brine discharge automatic valve 215 is opened, and other automatic valves are closed; Stripping is carried out in the 4# salt lake lithium extraction resin unit, only the stripping water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; Washing is carried out in the 5# salt lake lithium extraction resin unit, only the washing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0051] After the 5 sets of lithium extraction from salt lake resin units have run for a period of time T, the controller controls each set of lithium extraction from salt lake resin units to sequentially cycle and change according to the technological steps of adsorption - back brine top water - desorption - rinsing. After the change: adsorption is carried out in the 5# lithium extraction from salt lake resin unit, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; adsorption is carried out in the 1# lithium extraction from salt lake resin unit, only the series connection automatic valve 223 and the rinsing water discharge automatic valve 221 are opened, and other automatic valves are closed. The resin bed 100 in the 1# lithium extraction from salt lake resin unit is connected in series with the resin bed 100 in the 5# lithium extraction from salt lake resin unit to achieve multi - stage adsorption; back brine top water is carried out in the 2# lithium extraction from salt lake resin unit, only the back brine discharge automatic valve 215 is opened, and other automatic valves are closed; desorption is carried out in the 3# lithium extraction from salt lake resin unit, only the desorbed water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; rinsing is carried out in the 4# lithium extraction from salt lake resin unit, only the rinsing water feed automatic valve 217 and the back brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0052] Figure 6 Figure 4 shows a schematic diagram of the 5 sets of lithium extraction from salt lake resin units corresponding one - to - one for adsorption, back brine top water, adsorption, desorption, and rinsing. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0053] Reference Figure 6 As shown: adsorption is carried out in the 1# lithium extraction from salt lake resin unit, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; back brine top water is carried out in the 2# lithium extraction from salt lake resin unit, only the back brine discharge automatic valve 215 and the rinsing water discharge automatic valve 221 are opened, and other automatic valves are closed; adsorption is carried out in the 3# lithium extraction from salt lake resin unit, only the body connection automatic valve 222 is opened, and other automatic valves are closed. The 3# lithium extraction from salt lake resin unit is connected in series with the 1# lithium extraction from salt lake resin unit to achieve multi - stage adsorption; desorption is carried out in the 4# lithium extraction from salt lake resin unit, only the desorbed water feed automatic valve 216 and the back brine feed automatic valve 219 are opened, and other automatic valves are closed; rinsing is carried out in the 5# lithium extraction from salt lake resin unit, only the rinsing water feed automatic valve 217 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed.

[0054] After the 5 sets of resin units for extracting lithium from salt lakes have been operating for a period of time T, the controller controls each set of resin units for extracting lithium from salt lakes to sequentially cycle and change according to the technological steps of adsorption - backwashing with tail brine - desorption - rinsing. After the change: Adsorption is carried out in the 5# resin unit for extracting lithium from salt lakes, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; Backwashing with tail brine is carried out in the 1# resin unit for extracting lithium from salt lakes, only the tail brine discharge automatic valve 215 and the rinsing water discharge automatic valve 221 are opened, and other automatic valves are closed; Adsorption is carried out in the 2# resin unit for extracting lithium from salt lakes, only the main body connection automatic valve 222 is opened, and other automatic valves are closed. The 2# resin unit for extracting lithium from salt lakes is in series with the 5# resin unit for extracting lithium from salt lakes to achieve multi - stage adsorption; Desorption is carried out in the 3# resin unit for extracting lithium from salt lakes, only the desorbed water feed automatic valve 216 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; Rinsing is carried out in the 4# resin unit for extracting lithium from salt lakes, only the rinsing water feed automatic valve 217 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed.

[0055] Exemplarily, as Figure 4 , Figure 7 and Figure 8 shown, there are at least 5 sets of resin units for extracting lithium from salt lakes. The controller is used to control the 5 sets of resin units for extracting lithium from salt lakes to respectively carry out the processes of adsorption, backwashing with tail brine, backwashing with tail brine, desorption, and rinsing. Among them, the second and third sets of resin units for extracting lithium from salt lakes are in series for backwashing with tail brine; or the controller is used to control the 5 sets of resin units for extracting lithium from salt lakes to respectively carry out the processes of adsorption, backwashing with tail brine, desorption, backwashing with tail brine, and rinsing. Among them, the second and fourth sets of resin units for extracting lithium from salt lakes are in series for backwashing with tail brine.

[0056] Figure 7 shows a schematic diagram of the 5 sets of resin units for extracting lithium from salt lakes corresponding one - to - one to carry out adsorption, backwashing with tail brine, backwashing with tail brine, desorption, and rinsing. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0057] Refer to Figure 7As shown: Adsorption is carried out in the 1# lithium extraction from salt lake resin unit, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; Tail brine displacement with water is carried out in the 2# lithium extraction from salt lake resin unit, only the tail brine discharge automatic valve 215 and the washing water discharge automatic valve 221 are opened, and other automatic valves are closed; Tail brine displacement with water is carried out in the 3# lithium extraction from salt lake resin unit, only the tail brine discharge automatic valve 215 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed. The resin bed 100 in the 3# lithium extraction from salt lake resin unit is in series with the resin bed 100 in the 2# lithium extraction from salt lake resin unit to achieve multi-stage tail brine displacement with water; Desorption is carried out in the 4# lithium extraction from salt lake resin unit, only the desorbed water feed automatic valve 216 is opened, and other automatic valves are closed; Washing is carried out in the 5# lithium extraction from salt lake resin unit, only the washing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0058] After the 5 sets of lithium extraction from salt lake resin units have run for a period of time T, the controller controls each set of lithium extraction from salt lake resin units to sequentially cycle and change according to the technological steps of adsorption - tail brine displacement with water - desorption - washing. After the change: Adsorption is carried out in the 5# lithium extraction from salt lake resin unit, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; Tail brine displacement with water is carried out in the 1# lithium extraction from salt lake resin unit, only the tail brine discharge automatic valve 215 and the washing water discharge automatic valve 221 are opened, and other automatic valves are closed; Tail brine displacement with water is carried out in the 2# lithium extraction from salt lake resin unit, only the tail brine discharge automatic valve 215 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed. The resin bed 100 in the 2# lithium extraction from salt lake resin unit is in series with the resin bed 100 in the 1# lithium extraction from salt lake resin unit to achieve multi-stage tail brine displacement with water; Desorption is carried out in the 3# lithium extraction from salt lake resin unit, only the desorbed water feed automatic valve 216 is opened, and other automatic valves are closed; Washing is carried out in the 4# lithium extraction from salt lake resin unit, only the washing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed.

[0059] Figure 8 Figure [figure number not provided] shows a schematic diagram of the 5 sets of lithium extraction from salt lake resin units corresponding one by one for adsorption, tail brine displacement with water, desorption, tail brine displacement with water, and washing. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0060] Reference Figure 8Shown as follows: Adsorption is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed. Tail brine backwashing is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the flushing water discharge automatic valve 221 are opened, and other automatic valves are closed. Desorption is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed. Tail brine backwashing is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the main body connection automatic valve 222 is opened, and other automatic valves are closed. The resin bed 100 in the 4# lithium extraction resin unit from salt lake brine is in series with the resin bed 100 in the 2# lithium extraction resin unit from salt lake brine to achieve multi-stage tail brine backwashing. Elution is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the flushing water feed automatic valve 217 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed.

[0061] After the 5 sets of lithium extraction resin units from salt lake brine operate for a period of time T, the controller controls each set of lithium extraction resin units from salt lake brine to sequentially cycle and change according to the technological steps of adsorption - tail brine backwashing - desorption - elution. After the change: Adsorption is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed. Tail brine backwashing is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the flushing water discharge automatic valve 221 are opened, and other automatic valves are closed. Desorption is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed. Tail brine backwashing is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the main body connection automatic valve 222 is opened, and other automatic valves are closed. The resin bed 100 in the 3# lithium extraction resin unit from salt lake brine is in series with the resin bed 100 in the 1# lithium extraction resin unit from salt lake brine to achieve multi-stage tail brine backwashing. Elution is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the flushing water feed automatic valve 217 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed.

[0062] Exemplarily, as Figure 4 、 Figure 9 and Figure 10 shown, there are at least 5 sets of lithium extraction resin units from salt lake brine. The controller is used to control the 5 sets of lithium extraction resin units from salt lake brine to respectively carry out the processes of adsorption, tail brine backwashing, desorption, desorption, and elution. Among them, the third set and the fourth set of lithium extraction resin units from salt lake brine are in series for desorption; or the controller is used to control the 5 sets of lithium extraction resin units from salt lake brine to respectively carry out the processes of adsorption, tail brine backwashing, desorption, elution, and desorption. Among them, the third set and the fifth set of lithium extraction resin units from salt lake brine are in series for desorption.

[0063] Figure 9Figure 5 shows a schematic diagram of the five sets of resin units for lithium extraction from salt lakes, which perform adsorption, brine top-up with tail brine, desorption, desorption, and elution in one-to-one correspondence. The automatic valves and pipelines in the closed state are omitted in the figure.

[0064] Reference Figure 9 As shown: In the 1# resin unit for lithium extraction from salt lakes, adsorption is carried out, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; in the 2# resin unit for lithium extraction from salt lakes, brine top-up with tail brine is carried out, only the tail brine discharge automatic valve 215 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; in the 3# resin unit for lithium extraction from salt lakes, desorption is carried out, only the desorbed water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; in the 4# resin unit for lithium extraction from salt lakes, desorption is carried out, only the series connection automatic valve 223 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed. The resin bed 100 in the 4# resin unit for lithium extraction from salt lakes is connected in series with the resin bed 100 in the 3# resin unit for lithium extraction from salt lakes to achieve multi-stage desorption; in the 5# resin unit for lithium extraction from salt lakes, elution is carried out, only the elution water feed automatic valve 217 is opened, and other automatic valves are closed.

[0065] After the five sets of resin units for lithium extraction from salt lakes have run for a period of time T, the controller controls each set of resin units for lithium extraction from salt lakes to sequentially cycle and change according to the technological steps of adsorption - brine top-up with tail brine - desorption - elution. After the change: In the 5# resin unit for lithium extraction from salt lakes, adsorption is carried out, only the brine feed automatic valve 214 and the desorbed water discharge automatic valve 220 are opened, and other automatic valves are closed; in the 1# resin unit for lithium extraction from salt lakes, brine top-up with tail brine is carried out, only the tail brine discharge automatic valve 215 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; in the 2# resin unit for lithium extraction from salt lakes, desorption is carried out, only the desorbed water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; in the 3# resin unit for lithium extraction from salt lakes, desorption is carried out, only the series connection automatic valve 223 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed. The resin bed 100 in the 3# resin unit for lithium extraction from salt lakes is connected in series with the resin bed 100 in the 2# resin unit for lithium extraction from salt lakes to achieve multi-stage desorption; in the 4# resin unit for lithium extraction from salt lakes, elution is carried out, only the elution water feed automatic valve 217 is opened, and other automatic valves are closed.

[0066] Figure 10 Figure 5 shows a schematic diagram of the five sets of resin units for lithium extraction from salt lakes, which perform adsorption, brine top-up with tail brine, desorption, elution, and desorption in one-to-one correspondence. The automatic valves and pipelines in the closed state are omitted in the figure.

[0067] Reference Figure 10As shown: Adsorption is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; Tail brine water displacement is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed; Desorption is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; Elution is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the elution water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; Desorption is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the main body connection automatic control valve is opened, and other automatic valves are closed. The resin bed 100 in the 5# lithium extraction resin unit from salt lake brine is in series with the resin bed 100 in the 3# lithium extraction resin unit from salt lake brine to achieve multi-stage desorption.

[0068] After the 5 sets of lithium extraction resin units from salt lake brine have run for a period of time T, the controller controls each set of lithium extraction resin units from salt lake brine to sequentially cycle and change according to the technological steps of adsorption - tail brine water displacement - desorption - elution. After the change: Adsorption is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; Tail brine water displacement is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed; Desorption is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; Elution is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the elution water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; Desorption is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the main body connection automatic control valve is opened, and other automatic valves are closed. The resin bed 100 in the 4# lithium extraction resin unit from salt lake brine is in series with the resin bed 100 in the 5# lithium extraction resin unit from salt lake brine to achieve multi-stage desorption.

[0069] Exemplarily, as Figure 4 、 Figure 11 and Figure 12 shown, there are at least 5 sets of lithium extraction resin units from salt lake brine. The controller is used to control the 5 sets of lithium extraction resin units from salt lake brine to respectively carry out adsorption, tail brine water displacement, desorption, elution, and elution processes. Among them, the fourth and fifth sets of lithium extraction resin units from salt lake brine are in series for elution; or, the controller is used to control the 5 sets of lithium extraction resin units from salt lake brine to respectively carry out tail brine water displacement, desorption, elution, adsorption, and elution processes. Among them, the third and fifth sets of lithium extraction resin units from salt lake brine are in series for elution.

[0070] Figure 11 Figure shows a schematic diagram of the 5 sets of lithium extraction resin units from salt lake brine corresponding one by one to carry out adsorption, tail brine water displacement, desorption, elution, and elution. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0071] Reference Figure 11 As shown: Adsorption is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 is opened, and other automatic valves are closed; Tail brine backwashing is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the washing water discharge automatic valve 221 are opened, and other automatic valves are closed; Desorption is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; Washing is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the washing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; Washing is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the series connection control valve and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed. The resin bed 100 in the 5# lithium extraction resin unit from salt lake brine is connected in series with the resin bed 100 in the 4# lithium extraction resin unit from salt lake brine to achieve multi-stage washing.

[0072] After the 5 sets of lithium extraction resin units from salt lake brine have run for a period of time T, the controller controls each set of lithium extraction resin units from salt lake brine to sequentially cycle and change according to the technological steps of adsorption - tail brine backwashing - desorption - washing. After the change: Adsorption is carried out in the 5# lithium extraction resin unit from salt lake brine. Only the brine feed automatic valve 214 is opened, and other automatic valves are closed; Tail brine backwashing is carried out in the 1# lithium extraction resin unit from salt lake brine. Only the tail brine discharge automatic valve 215 and the washing water discharge automatic valve 221 are opened, and other automatic valves are closed; Desorption is carried out in the 2# lithium extraction resin unit from salt lake brine. Only the desorption water feed automatic valve 216 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; Washing is carried out in the 3# lithium extraction resin unit from salt lake brine. Only the washing water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; Washing is carried out in the 4# lithium extraction resin unit from salt lake brine. Only the series connection control valve and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed. The resin bed 100 in the 4# lithium extraction resin unit from salt lake brine is connected in series with the resin bed 100 in the 3# lithium extraction resin unit from salt lake brine to achieve multi-stage washing.

[0073] Figure 12 The figure shows a schematic diagram of the 5 sets of lithium extraction resin units from salt lake brine corresponding one by one for tail brine backwashing, desorption, washing, adsorption, and washing. In the figure, the automatic valves and pipelines in the closed state are omitted.

[0074] Reference Figure 12As shown: In the 1# lithium extraction from brine resin unit, top water with tail brine is carried out. Only the tail brine discharge automatic valve 215 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; In the 2# lithium extraction from brine resin unit, desorption is carried out. Only the desorption water feed automatic valve 216 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; In the 3# lithium extraction from brine resin unit, elution is carried out. Only the elution water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; In the 4# lithium extraction from brine resin unit, adsorption is carried out. Only the brine feed automatic valve 214 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed; In the 5# lithium extraction from brine resin unit, desorption is carried out. Only the main body connection automatic control valve is opened, and other automatic valves are closed. The resin bed 100 in the 5# lithium extraction from brine resin unit is connected in series with the resin bed 100 in the 3# lithium extraction from brine resin unit to achieve multi-stage elution.

[0075] After the 5 sets of lithium extraction from brine resin units have run for a period of time T (for example, T = 60s, which can also be set to other durations), the controller controls each set of lithium extraction from brine resin units to sequentially cycle and change according to the technological steps of adsorption - top water with tail brine - desorption - elution. After the change: In the 5# lithium extraction from brine resin unit, top water with tail brine is carried out. Only the tail brine discharge automatic valve 215 and the brine discharge automatic valve 218 are opened, and other automatic valves are closed; In the 1# lithium extraction from brine resin unit, desorption is carried out. Only the desorption water feed automatic valve 216 and the elution water discharge automatic valve 221 are opened, and other automatic valves are closed; In the 2# lithium extraction from brine resin unit, elution is carried out. Only the elution water feed automatic valve 217 and the tail brine feed automatic valve 219 are opened, and other automatic valves are closed; In the 3# lithium extraction from brine resin unit, adsorption is carried out. Only the brine feed automatic valve 214 and the desorption water discharge automatic valve 220 are opened, and other automatic valves are closed; In the 4# lithium extraction from brine resin unit, desorption is carried out. Only the main body connection automatic control valve is opened, and other automatic valves are closed. The resin bed 100 in the 4# lithium extraction from brine resin unit is connected in series with the resin bed 100 in the 2# lithium extraction from brine resin unit to achieve multi-stage elution.

[0076] As Figure 13 and 14 shown, a lithium extraction from brine resin system with 18 sets of lithium extraction from brine resin units is presented. Among them, Figure 13 the schematic diagram in state T1 is shown, Figure 14 the schematic diagram in state T2 is shown, and T1 is the previous time period of T2. It can be seen that in Figure 13Among them, the 1# lithium extraction from salt lake resin unit and the 3# lithium extraction from salt lake resin unit are connected in series for adsorption, the 2# lithium extraction from salt lake resin unit and the 4# lithium extraction from salt lake resin unit are connected in series for adsorption, the 5# lithium extraction from salt lake resin unit and the 7# lithium extraction from salt lake resin unit are connected in series for adsorption, the 6# lithium extraction from salt lake resin unit and the 8# lithium extraction from salt lake resin unit are connected in series for adsorption. The above 4 sets of series adsorption structures are connected in parallel on the supply and discharge pipeline; the 9# lithium extraction from salt lake resin unit is used for tail brine top water; the 10# lithium extraction from salt lake resin unit, the 12# lithium extraction from salt lake resin unit, and the 14# lithium extraction from salt lake resin unit are connected in series for desorption, the 11# lithium extraction from salt lake resin unit, the 13# lithium extraction from salt lake resin unit, and the 15# lithium extraction from salt lake resin unit are connected in series for desorption. The above series desorption structures are connected in parallel on the supply and discharge pipeline; the 16# lithium extraction from salt lake resin unit, the 17# lithium extraction from salt lake resin unit, and the 18# lithium extraction from salt lake resin unit are connected in series for elution. In Figure 14 Among them, that is, the controller controls each set of lithium extraction from salt lake resin units to perform a change according to the technological steps of adsorption - tail brine top water - desorption - elution. At this time, the 2# lithium extraction from salt lake resin unit and the 4# lithium extraction from salt lake resin unit are connected in series for adsorption, the 3# lithium extraction from salt lake resin unit and the 5# lithium extraction from salt lake resin unit are connected in series for adsorption, the 6# lithium extraction from salt lake resin unit and the 8# lithium extraction from salt lake resin unit are connected in series for adsorption, the 7# lithium extraction from salt lake resin unit and the 9# lithium extraction from salt lake resin unit are connected in series for adsorption. The above 4 sets of series adsorption structures are connected in parallel on the supply and discharge pipeline; the 10# lithium extraction from salt lake resin unit is used for tail brine top water; the 11# lithium extraction from salt lake resin unit, the 13# lithium extraction from salt lake resin unit, and the 15# lithium extraction from salt lake resin unit are connected in series for desorption, the 12# lithium extraction from salt lake resin unit, the 14# lithium extraction from salt lake resin unit, and the 16# lithium extraction from salt lake resin unit are connected in series for desorption. The above series desorption structures are connected in parallel on the supply and discharge pipeline; the 17# lithium extraction from salt lake resin unit, the 18# lithium extraction from salt lake resin unit, and the 1# lithium extraction from salt lake resin unit are connected in series for elution.

[0077] In the description of this specification, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0079] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0080] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0081] The above disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0082] The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily conceive of various changes or substitutions, and these should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A valve array structure (200), characterized in that: The invention comprises a first common pipe (201), a second common pipe (202), a first connecting pipe (203), a second connecting pipe (204) and a third connecting pipe (205); the first common pipe (201) is connected with a brine feed branch pipe (206), a tail brine discharge branch pipe (207), a desorption water feed branch pipe (208) and a rinse water feed branch pipe (209); the second common pipe (202) is connected with a brine discharge branch pipe (210), a tail brine feed branch pipe (211), a desorption water discharge branch pipe (212) and a rinse water discharge branch pipe (213); two ends of the first connecting pipe (203) are respectively connected with the first common pipe (201) and the second common pipe (202); the second connecting pipe (204) and the third connecting pipe (205) are connected in parallel; the other end of the second connecting pipe (204) is used to connect with the first common pipe (201) of other valve array structures (200); the third connecting pipe (205) is connected with the first common pipe (201) of other valve array structures (200); The other end of the connecting pipe (205) is used to connect the second common pipe (202) of the other valve array structure (200), the brine feed branch pipe (206), the tail brine discharge branch pipe (207), the analytical water feed branch pipe (208), the rinse water feed branch pipe (209), the brine discharge branch pipe (210), the tail brine feed branch pipe (211), the analytical water discharge branch pipe (212), the rinse water discharge branch pipe (213), the first connecting pipe (203), the second common pipe (204), the second common pipe (205) and the second common pipe (206). The two connecting pipes (204) are respectively provided with a brine feed automatic valve (214), a tail brine discharge automatic valve (215), a desorption water feed automatic valve (216), a rinse water feed automatic valve (217), a brine discharge automatic valve (218), a tail brine feed automatic valve (219), a desorption water discharge automatic valve (220), a rinse water discharge automatic valve (221), a main body connection automatic valve (222), and a series connection automatic valve (223) in a one-to-one correspondence.

2. A salt lake lithium extraction resin system, characterized in that: The invention comprises a controller and at least four sets of salt lake lithium extraction resin units, wherein the salt lake lithium extraction resin units comprise a resin bed (100) and a valve array structure (200) as claimed in claim 1, wherein one end of the first common pipe (201) is connected to the top material inlet and outlet of the resin bed (100), one end of the second connecting pipe (204) and one end of the third connecting pipe (205) are connected in parallel and connected to the bottom material inlet and outlet of the resin bed (100), the other end of the second connecting pipe (204) is connected to the first common pipe (201) in the next set of salt lake lithium extraction resin units, and the other end of the third connecting pipe (205) is connected to the second common pipe (202) in the next two sets of salt lake lithium extraction resin units, and the controller is used to control the opening and closing of each automatic valve in each valve array structure (200), so as to control the four sets of salt lake lithium extraction resin units to perform adsorption, tail brine top water, analysis, and elution processes one by one, and control each set of salt lake lithium extraction resin units to change cyclically in sequence according to the process steps of adsorption-tail brine top water-analysis-elution.

3. The salt lake lithium extraction resin system according to claim 2, characterized in that: The salt lake lithium extraction resin system also includes a supply and discharge pipeline, which includes a brine feed main pipe (301), a tail brine discharge main pipe (302), a desorption water feed main pipe (303), a rinse water feed main pipe (304), a brine discharge main pipe (305), a tail brine feed main pipe (306), a desorption water discharge main pipe (307) and a rinse water discharge main pipe (308), and the brine feed branch pipe (206), the tail brine discharge branch pipe (207), the desorption water feed branch pipe (208) of each of the valve array structures (200) ), a rinse water feed branch pipe (209), a brine discharge branch pipe (210), a tail brine feed branch pipe (211), a decomposition water discharge branch pipe (212), and a rinse water discharge branch pipe (213) are respectively connected one by one to the brine feed main pipe (301), the tail brine discharge main pipe (302), the decomposition water feed main pipe (303), the rinse water feed main pipe (304), the brine discharge main pipe (305), the tail brine feed main pipe (306), the decomposition water discharge main pipe (307), and the rinse water discharge main pipe (308).

4. The salt lake lithium extraction resin system according to claim 3, characterized in that: The salt lake lithium extraction resin system also includes a pumping unit, which includes a brine feed pump (401), an analytical water feed pump (402), a rinse water feed pump (403) and a tail brine feed pump (404). The brine feed pump (401), the analytical water feed pump (402), the rinse water feed pump (403) and the tail brine feed pump (404) are respectively installed one by one at one end of the brine feed main pipe (301), the analytical water feed main pipe (303), the rinse water feed main pipe (304) and the tail brine feed main pipe (306).

5. The salt lake lithium extraction resin system according to claim 4, characterized in that: The brine discharge main pipe (305), the analytical water discharge main pipe (307), the rinse water discharge main pipe (308), and the tail brine discharge main pipe (302) are respectively connected to the tail brine tank resin catcher (309), the heat exchanger (310), the third-stage nanofiltration concentrated water tank (311), and the intermediate water tank (312) in a one-to-one correspondence.

6. The salt lake lithium extraction resin system according to claim 2, characterized in that: The salt lake lithium extraction resin units are provided with at least 5 sets, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, adsorption, tail brine top water, analysis, and elution processes, wherein the first and second sets of salt lake lithium extraction resin units are adsorbed in series; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, adsorption, analysis, and elution processes, wherein the first and third sets of salt lake lithium extraction resin units are adsorbed in series.

7. The salt lake lithium extraction resin system according to claim 2, characterized in that: The salt lake lithium extraction resin unit is provided with at least 5 sets, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, tail brine top water, analysis, and elution processes, wherein the second and third sets of salt lake lithium extraction resin units are connected in series with tail brine top water; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, analysis, tail brine top water, and elution processes, wherein the second and fourth sets of salt lake lithium extraction resin units are connected in series with tail brine top water.

8. The salt lake lithium extraction resin system according to claim 2, characterized in that: The salt lake lithium extraction resin units are provided with at least 5 sets, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, analysis, analysis, and elution processes, wherein the third and fourth sets of salt lake lithium extraction resin units are analyzed in series; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, analysis, elution, and analysis processes, wherein the third and fifth sets of salt lake lithium extraction resin units are analyzed in series.

9. The salt lake lithium extraction resin system according to claim 2, characterized in that: The salt lake lithium extraction resin unit is provided with at least 5 sets, and the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform adsorption, tail brine top water, analysis, elution, and elution processes, wherein the fourth and fifth sets of salt lake lithium extraction resin units are eluted in series; or, the controller is used to control the 5 sets of salt lake lithium extraction resin units to respectively perform tail brine top water, analysis, elution, adsorption, and elution processes, wherein the third and fifth sets of salt lake lithium extraction resin units are eluted in series.

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