CN116162796A - Magnesium-lithium separation device applied to brine lithium extraction process - Google Patents
Magnesium-lithium separation device applied to brine lithium extraction process Download PDFInfo
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- CN116162796A CN116162796A CN202111407486.7A CN202111407486A CN116162796A CN 116162796 A CN116162796 A CN 116162796A CN 202111407486 A CN202111407486 A CN 202111407486A CN 116162796 A CN116162796 A CN 116162796A
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- 238000000926 separation method Methods 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 29
- 239000012267 brine Substances 0.000 title claims abstract description 24
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 24
- 238000000605 extraction Methods 0.000 title claims abstract description 23
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 238000004587 chromatography analysis Methods 0.000 claims description 13
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003729 cation exchange resin Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 8
- 238000013375 chromatographic separation Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 5
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011097 chromatography purification Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a magnesium-lithium separation device applied to a brine lithium extraction process, which comprises a feed liquid conveying pipeline, a mobile phase conveying pipeline, a slow component collecting pipeline, a fast component collecting pipeline and a separation system, wherein the separation system comprises N radial flow chromatographic columns, a circulating pump, N feed liquid pipelines, N mobile phase pipelines, N slow component diversion pipelines, N fast component diversion pipelines and N connecting pipelines, and the N radial flow chromatographic columns are communicated end to end through the connecting pipelines. Compared with the traditional axial chromatographic separation device, the chromatographic separation mode of the separation device adopts a radial countercurrent design, has the advantages of high flow speed, low operation pressure, easy linear amplification, large sample treatment capacity and the like, can realize efficient and continuous countercurrent separation of brine with high magnesium-lithium ratio, can obtain high-purity lithium-containing solution, can increase the treatment capacity and improve the yield, has a simple structure, is convenient to operate, can effectively save the production cost and improves the economic benefit.
Description
Technical Field
The invention relates to the technical field of brine lithium extraction, in particular to a magnesium-lithium separation device applied to a brine lithium extraction process.
Background
The prevalence of lithium ion batteries worldwide has driven the rapid increase in lithium resource demands. Salt lake lithium extraction is the most important source of lithium resources accepted. China belongs to the great country of salt lake and has rich lithium resources. At present, a plurality of methods for separating magnesium from lithium and extracting lithium from salt lake brine with high magnesium-lithium ratio are available, including an extraction method, an adsorption method, a reaction/separation coupling method, an electrochemical method and the like. The extraction method is commonly used for organic solvent extraction or ionic liquid extraction, and has the problems of high cost and easy environmental pollution. The adsorption method uses an adsorbent or an ion sieve as an adsorption material, and mainly aims at solving the problems of high magnesium-lithium ratio brine, high adsorption capacity, acid treatment corrosion pollution and serious dissolution loss of the adsorbent. The reaction/separation coupling method is easy to introduce other impurities. Membrane processes are commonly used for nanofiltration, electrodialysis, bipolar membranes and the like, but the methods have high pretreatment requirements, the membranes are easy to pollute, and the applicability to brine with high magnesium-lithium ratio is limited. The electrochemical method comprises an ion capturing system and a rocking chair battery system, and has the problems of high energy consumption, high electrolyte requirement and high power consumption. The lithium-containing salt lake brine in China has the characteristics of high magnesium-lithium ratio and low lithium content, has high separation difficulty, and is difficult to meet the existing lithium requirement by applying the conventional magnesium-lithium separation and lithium extraction method.
Therefore, how to provide a magnesium-lithium separation device with simple operation, large treatment capacity and high yield, which is applied to the brine lithium extraction process, is one of the technical problems to be solved in the field.
Disclosure of Invention
In view of the above, the present invention provides a magnesium-lithium separation device for brine extraction process, which aims to solve the above-mentioned drawbacks.
In order to solve the technical problems, the invention adopts the following technical scheme:
a magnesium-lithium separation device applied to a brine lithium extraction process, comprising: a feed liquid conveying pipeline, a mobile phase conveying pipeline, a slow component collecting pipeline, a fast component collecting pipeline and a separating system; the separation system comprises N radial flow chromatographic columns, a circulating pump, N feed liquid pipelines, N mobile phase pipelines, N slow component diversion pipelines, N fast component diversion pipelines and N connecting pipelines; the top of each radial flow chromatographic column is communicated with the feed liquid conveying pipeline through one feed liquid pipeline and is communicated with the mobile phase conveying pipeline through one mobile phase pipeline; each feed liquid pipeline is provided with a feed liquid control valve; each mobile phase pipeline is provided with a mobile phase control valve; the bottom of each radial flow chromatographic column is communicated with the slow component collecting pipeline through one slow component diversion pipeline and is communicated with the fast component collecting pipeline through one fast component diversion pipeline; each slow component flow guide pipe is provided with a slow component control valve; each fast component flow guide pipe is provided with a fast component control valve; the bottom of the first radial flow chromatographic column is communicated with the top of the second radial flow chromatographic column through a connecting pipeline; the bottom of the second radial flow chromatographic column is communicated with the top of the third radial flow chromatographic column through a connecting pipeline; … …; the bottom of the N-1 radial flow chromatographic column is communicated with the top of the N radial flow chromatographic column through a connecting pipeline; the bottom of the nth radial flow chromatographic column is communicated with the top of the first radial flow chromatographic column through a connecting pipeline; and a circulating pump is arranged on the connecting pipeline between the bottom of the Nth radial flow chromatographic column and the top of the first radial flow chromatographic column.
The beneficial effects of this technical scheme are: the method comprises the steps of sequentially connecting a plurality of radial flow chromatographic columns together by using connecting pipelines from beginning to end, connecting a feed liquid pipeline and a mobile phase pipeline at the top of each radial flow chromatographic column, simultaneously connecting a slow component diversion pipeline and a fast component diversion pipeline at the bottom of each radial flow chromatographic column, facilitating material entering and exiting, and arranging a feed liquid control valve, a mobile phase control valve, a slow component control valve, a fast component control valve and a fluid valve, wherein the material entering and exiting in each radial flow chromatographic column can be controlled, so that a continuous countercurrent chromatographic separation and purification system is formed.
Preferably, each connecting pipeline is provided with a flow valve.
Preferably, the packing of each of the radial flow chromatography columns is a cation exchange resin.
Preferably, a feed end of the feed liquid conveying pipeline is connected with a feed liquid conveying system; the feed liquid conveying system comprises a feed liquid conveying pump and a feed liquid storage device for storing feed liquid; the feed liquid in the feed liquid storage device is input into the feed liquid conveying pipeline through the feed liquid conveying pump.
Preferably, a feed liquid preheater is arranged in the feed liquid storage device.
The beneficial effects of this technical scheme are: the feed liquid can be heated by the feed liquid preheater for maintaining the feed liquid sampling temperature.
Preferably, the feeding end of the mobile phase conveying pipeline is connected with a mobile phase conveying system; the mobile phase conveying system comprises a mobile phase conveying pump and a mobile phase storage device for storing mobile phases; the feed liquid in the mobile phase storage device is input into a mobile phase conveying pipeline through the mobile phase conveying pump.
Preferably, the discharging ends of the slow component collecting pipeline and the fast component collecting pipeline are connected with a fast and slow component collecting system.
Preferably, each radial flow chromatography column is mounted in a chromatography column temperature control box.
The beneficial effects of this technical scheme are: facilitating the regulation of temperature within the radial flow chromatography column.
Compared with the prior art, the invention has the following technical effects:
1) The chromatographic separation mode of the separation device adopts radial countercurrent design, and compared with the traditional axial chromatographic separation device, the chromatographic separation device has the advantages of high flow speed, low operating pressure, easy linear amplification, large sample treatment capacity and the like;
2) Firstly, a cation exchange resin filler is filled into radial flow chromatographic columns to be fixed, then a plurality of chromatographic columns are connected in series end to end, and then the top and the bottom of each radial flow chromatographic column are respectively provided with an inlet and an outlet of a material, in the running process, the countercurrent flow of a stationary phase relative to a mobile phase is simulated by periodically changing the inlet and the outlet of the material at a set time interval along the flowing direction of the mobile phase, so that the continuous separation of fast and slow components is realized, the high-efficiency continuous separation of magnesium and lithium in high-magnesium and lithium ratio brine can be realized, and the whole separation device can not only obtain a lithium-containing solution with high purity, but also can increase the treatment capacity and the yield;
3) The whole device has simple structure and convenient operation, can effectively save the production cost and improve the economic benefit.
Drawings
FIG. 1 is a schematic diagram of a magnesium-lithium separation device for brine extraction process according to the present invention;
in the figure: 1. a feed liquid conveying pipeline; 2. a mobile phase delivery line; 3. a slow component collection line; 4. a fast component collection pipeline; 5. a separation system; 51. a radial flow chromatographic column; 52. a circulation pump; 53. a feed liquid pipeline; 54. a mobile phase pipeline; 55. a slow component diversion pipeline; 56. a fast component diversion pipeline; 57. a connecting pipeline; 571. a flow-through valve; 6. a feed liquid control valve; 7. a mobile phase control valve; 8. a slow component control valve; 9. a fast component control valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1, the invention discloses a magnesium-lithium separation device applied to a brine lithium extraction process, which comprises: a feed liquid conveying pipeline 1, a mobile phase conveying pipeline 2, a slow component collecting pipeline 3, a fast component collecting pipeline 4 and a separation system 5; the separation system 5 comprises N radial flow chromatographic columns 51, a circulating pump 52, N feed liquid pipelines 53, N mobile phase pipelines 54, N slow component diversion pipelines 55, N fast component diversion pipelines 56 and N connecting pipelines 57; the top of each radial flow chromatographic column 51 is communicated with the feed liquid conveying pipeline 1 through a feed liquid pipeline 53 and is communicated with the mobile phase conveying pipeline 2 through a mobile phase pipeline 54; each feed liquid pipeline 53 is provided with a feed liquid control valve 6; each mobile phase pipeline 54 is provided with a mobile phase control valve 7; the bottom of each radial flow chromatographic column 51 is communicated with the slow component collecting pipeline 3 through a slow component diversion pipeline 55 and is communicated with the fast component collecting pipeline 4 through a fast component diversion pipeline 56; each slow component diversion pipeline 55 is provided with a slow component control valve 8; each fast component diversion pipeline 56 is provided with a fast component control valve 9; the bottom of the first radial flow chromatographic column 51 is in communication with the top of the second radial flow chromatographic column 51 via a connecting line 57; the bottom of the second radial flow chromatographic column 51 is in communication with the top of the third radial flow chromatographic column 51 via a connecting line 57; … …; the bottom of the N-1 radial flow chromatographic column 51 is communicated with the top of the N radial flow chromatographic column 51 through a connecting pipeline 57; the bottom of the nth radial flow chromatographic column 51 is communicated with the top of the first radial flow chromatographic column 51 through a connecting pipeline 57; a circulation pump 52 is provided on a connecting line 57 between the bottom of the nth radial flow chromatography column 51 and the top of the first radial flow chromatography column 51.
In the present embodiment, a flow valve 571 is provided on each connection pipe 57.
In this embodiment, each radial flow chromatographic column 51 is composed of a concentric cylinder of glass and a chromatographic separation medium interposed therebetween, and the solution enters from the top of the radial flow chromatographic column 51 and flows centripetally from the circumference to the center of the circle and then flows out from the bottom of the radial flow chromatographic column 51.
In this embodiment, the packing of each radial flow chromatography column 51 is a strongly acidic cation exchange resin.
In the embodiment, a feed end of a feed liquid conveying pipeline 1 is connected with a feed liquid conveying system; the feed liquid conveying system comprises a feed liquid conveying pump and a feed liquid storage device for storing feed liquid; the feed liquid in the feed liquid storage device is input into the feed liquid conveying pipeline 1 through a feed liquid conveying pump.
In this embodiment, a feed liquid preheater is provided in the feed liquid storage device.
In the embodiment, a mobile phase conveying system is connected to the feeding end of the mobile phase conveying pipeline 2; the mobile phase conveying system comprises a mobile phase conveying pump and a mobile phase storage device for storing mobile phases; the feed liquid in the mobile phase storage device is fed into the mobile phase feed line 2 by a mobile phase feed pump.
In the embodiment, the discharging ends of the slow component collecting pipeline 3 and the fast component collecting pipeline 4 are connected with a fast and slow component collecting system; the fast and slow component collecting system comprises a plurality of collectors and pipelines; multiple collectors facilitate separate collection of the slow component solution and the fast component solution.
In this embodiment, the mobile phase of the radial flow chromatography column 51 is hydrochloric acid solution.
In this embodiment, the radial flow chromatography column 51 has a diameter of 20mm and a height of 360mm.
In this embodiment, the flow valve 571, the feed liquid control valve 6, the mobile phase control valve 7, the slow component control valve 8, and the fast component control valve 9 are made of peek material.
In the present embodiment, the number of radial flow chromatography columns 51 is 6.
In the present embodiment, the circulation pump 52, the feed liquid delivery pump, and the mobile phase delivery pump are one of peristaltic pumps or piston pumps.
In this embodiment, each radial flow column 51 is mounted in a column temperature control box for adjusting the radial flow column 51 temperature.
In other embodiments, the packing of the radial flow chromatography column 51 may also be a weakly acidic cation exchange resin.
The process flow comprises the following steps: each radial flow chromatographic column 51 is subjected to three steps, namely double in and double out, circulation, single in and single out, and 18 sub-steps are required for one cycle of operation of the device. The first step is double inlet and double outlet, mobile phase (hydrochloric acid solution) and material (lithium mixed solution including MgCl) 2 LiCl, HCl, wherein Mg: li is 40:1) enters the system from the top of the 1 st radial flow chromatographic column 51 and the 4 th radial flow chromatographic column 51, respectively, and slow components (MgCl) are collected from the bottoms of the 1 st radial flow chromatographic column 51 and the 5 th radial flow chromatographic column 51, respectively 2 And HCl) and a fast component (LiCl), the duration of this process being 200s (adjusted according to the sample), the mobile phase and the material flow rate being identical, being 25ml/min; the second step is circulation, the material circulates in the system at this stage, namely does not enter the system and does not leave the system, the circulation time is 600s (adjusted according to the actual running condition), and the circulation flow rate is 40ml/min; the third step is single inlet and single outlet, mobile phase is added from the top of the 2 nd radial flow chromatographic column 51, the fast component is collected at the bottom of the 6 th radial flow chromatographic column 51, the duration of the process is 10s (according to the adjustment of actual operation condition), the flow rate of the mobile phase is 40ml/min, then the mobile phase is switched to the 2 nd radial flow chromatographic column, all the feeding and discharging ports also move downwards by one radial flow chromatographic column 51, and the continuous sample injection and sample discharge of magnesium and lithium in the system are realized by sequentially and circularly reciprocating.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (8)
1. Be applied to magnesium lithium separator of brine extraction lithium technology, characterized by comprising: a feed liquid conveying pipeline (1), a mobile phase conveying pipeline (2), a slow component collecting pipeline (3), a fast component collecting pipeline (4) and a separation system (5); the separation system (5) comprises N radial flow chromatographic columns (51), a circulating pump (52), N feed liquid pipelines (53), N mobile phase pipelines (54), N slow component diversion pipelines (55), N fast component diversion pipelines (56) and N connecting pipelines (57); the top of each radial flow chromatographic column (51) is communicated with the feed liquid conveying pipeline (1) through a feed liquid pipeline (53) and is communicated with the mobile phase conveying pipeline (2) through a mobile phase pipeline (54); each feed liquid pipeline (53) is provided with a feed liquid control valve (6); each mobile phase pipeline (54) is provided with a mobile phase control valve (7); the bottom of each radial flow chromatographic column (51) is communicated with the slow component collecting pipeline (3) through a slow component diversion pipeline (55) and is communicated with the fast component collecting pipeline (4) through a fast component diversion pipeline (56); each slow component diversion pipeline (55) is provided with a slow component control valve (8); each fast component diversion pipeline (56) is provided with a fast component control valve (9); the bottom of a first radial flow chromatographic column (51) is communicated with the top of a second radial flow chromatographic column (51) through a connecting pipeline (57); the bottom of a second radial flow chromatographic column (51) is communicated with the top of a third radial flow chromatographic column (51) through a connecting pipeline (57); … …; the bottom of the N-1 radial flow chromatographic column (51) is communicated with the top of the N radial flow chromatographic column (51) through a connecting pipeline (57); the bottom of the Nth radial flow chromatographic column (51) is communicated with the top of the first radial flow chromatographic column (51) through a connecting pipeline (57); a circulating pump (52) is arranged on the connecting pipeline (57) between the bottom of the Nth radial flow chromatographic column (51) and the top of the first radial flow chromatographic column (51).
2. A magnesium-lithium separation device applied to a brine extraction process according to claim 1, wherein each connecting pipeline (57) is provided with a flow valve (571).
3. A magnesium-lithium separation device for use in a brine extraction process according to claim 1, wherein the packing of each radial flow chromatographic column (51) is a cation exchange resin.
4. The magnesium-lithium separation device applied to the brine lithium extraction process according to claim 1, wherein a feed end of the feed liquid conveying pipeline (1) is connected with a feed liquid conveying system; the feed liquid conveying system comprises a feed liquid conveying pump and a feed liquid storage device for storing feed liquid; the feed liquid in the feed liquid storage device is input into the feed liquid conveying pipeline (1) through the feed liquid conveying pump.
5. The magnesium-lithium separation device applied to the brine lithium extraction process according to claim 4, wherein a feed liquid preheater is arranged in the feed liquid storage device.
6. The magnesium-lithium separation device applied to the brine lithium extraction process according to claim 1, wherein a mobile phase conveying system is connected to a feeding end of the mobile phase conveying pipeline (2); the mobile phase conveying system comprises a mobile phase conveying pump and a mobile phase storage device for storing mobile phases; the feed liquid in the mobile phase storage device is input into a mobile phase conveying pipeline (2) through the mobile phase conveying pump.
7. The magnesium-lithium separation device applied to the brine lithium extraction process according to claim 1, wherein the discharging ends of the slow component collecting pipeline (3) and the fast component collecting pipeline (4) are connected with a fast and slow component collecting system.
8. A magnesium-lithium separation device for use in a brine extraction process according to claim 1, wherein each radial flow chromatography column (51) is mounted in a chromatography column temperature control box.
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