CN117413079A - Device and method for extracting lithium from salt lake - Google Patents
Device and method for extracting lithium from salt lake Download PDFInfo
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- CN117413079A CN117413079A CN202380010661.XA CN202380010661A CN117413079A CN 117413079 A CN117413079 A CN 117413079A CN 202380010661 A CN202380010661 A CN 202380010661A CN 117413079 A CN117413079 A CN 117413079A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000000605 extraction Methods 0.000 claims abstract description 87
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052796 boron Inorganic materials 0.000 claims abstract description 44
- 239000012267 brine Substances 0.000 claims abstract description 22
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 239000012074 organic phase Substances 0.000 claims description 51
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 50
- 239000000243 solution Substances 0.000 claims description 47
- 238000002156 mixing Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical group CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 9
- 239000003011 anion exchange membrane Substances 0.000 claims description 7
- 238000005341 cation exchange Methods 0.000 claims description 7
- 238000005191 phase separation Methods 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000003085 diluting agent Substances 0.000 claims description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract description 10
- 239000004327 boric acid Substances 0.000 abstract description 10
- 238000003916 acid precipitation Methods 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000012747 synergistic agent Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 borate ions Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a device and a method for extracting lithium from a salt lake, which belong to the technical field of extracting lithium from the salt lake and comprise a feeding liquid tank, a cathode chamber, an anode chamber, an extraction tank and a boron removal tank, wherein the feeding liquid tank, the cathode chamber, the anode chamber, the extraction tank and the boron removal tank are sequentially separated by an exchange membrane, and the extraction tank is connected with a back extraction tank. The extraction tank and the boron removal tank are arranged, so that the influence of boric acid precipitation on lithium extraction is effectively avoided in the lithium extraction process, in addition, the boron removal reaction is performed during the lithium extraction, the brine is not required to be pretreated in advance for removing boron, the process is simplified, and the recovery rate and purity of lithium are effectively improved.
Description
Technical Field
The invention relates to the technical field of lithium extraction in salt lakes, in particular to a device and a method for extracting lithium from salt lakes.
Background
Lithium and its compounds are widely used in the fields of glass, ceramics, batteries, nuclear industry, etc. because of their many important characteristics. In recent years, due to rapid development of electric vehicles, lithium ion lithium batteries have become one of the most rapidly developed fields. The global lithium productivity is 80% from the salt lake, the brine lithium resources in China are very rich, and the lithium resource reserves of the Qinghai salt lake are the main. The Qinghai salt lake brine belongs to a multi-component system, has complex composition, wherein inorganic salts exist in the form of monovalent or divalent ions, the radii of lithium ions and magnesium ions are similar, the chemical properties are similar, the high magnesium-lithium ratio is the main characteristic of Qinghai salt lake resources, the lithium ion concentration is 0.3 g/L-6 g/L, the magnesium ion concentration is 100-125 g/L, and the magnesium-lithium mass ratio is (20-100): 1, the separation of magnesium and lithium becomes difficult, and is also the key point and the key point of the salt lake lithium extraction technology.
The method has the advantages that the method is widely and deeply researched for precipitation, extraction and ion exchange adsorption of the high-magnesium-lithium-ratio salt lake lithium extraction, the experimental scale of the research of extracting lithium by a TBP extraction method in China is large and the method is most deep, the lithium is extracted from the high-magnesium-lithium-ratio brine most effectively, and the method is one of the salt lake high-magnesium-lithium-ratio brine lithium extraction methods with industrial application prospects. However, the use of TBP extraction to extract lithium inevitably employs FeCl 3 As the synergistic agent, the organic phase contains the synergistic agent, so that the brine is required to be kept weakly acidic, otherwise Fe hydrolysis is caused, the brine entering the extraction working section is required to be subjected to acidification treatment, lithium and boron are commonly associated in salt lakes in Qinghai-Tibet areas of China, boric acid is necessarily separated out in the acidification process, and boron removal treatment is required in advance.
In view of this, the text is presented.
Disclosure of Invention
The device and the method for extracting lithium from the salt lake are used for effectively avoiding the influence of boric acid precipitation on lithium extraction in the process of extracting lithium, and the boron removal reaction is carried out during the lithium extraction without pre-treating brine for removing boron, so that the process is simplified, and the recovery rate and purity of lithium are effectively improved.
In order to achieve the above purpose, the technical scheme adopted herein is as follows:
the utility model provides a salt lake draws lithium device, includes feed liquid groove, negative pole room, positive pole room, extraction tank, removes the boron groove, feed liquid groove, negative pole room, positive pole room, extraction tank, remove the boron groove and separate with the exchange membrane in proper order, the extraction tank is connected with the back extraction groove, be equipped with the negative pole in the negative pole room, be equipped with the positive pole in the positive pole room, the negative pole with the positive pole sets up relatively.
The method has the advantages that the extraction tank and the boron removal tank are arranged, in the lithium extraction process, cations of lithium-containing brine enter the extraction tank, an organic extraction system extracts lithium in an aqueous phase, a load organic phase and raffinate are obtained, anions such as borate enter the boron removal tank, boric acid precipitation is effectively avoided being formed in the lithium extraction process to affect the extraction of lithium, in addition, the boron removal reaction is carried out while the lithium extraction is carried out, the pretreatment of the brine for removing boron is not needed, the process is simplified, and the recovery rate and purity of lithium are effectively improved.
In one embodiment, the cathode is connected to the negative pole of the power supply by a wire and the anode is connected to the positive pole of the power supply by conduction.
In one embodiment, the extraction tank is provided with a stirring paddle.
In one embodiment, the feed liquid tank is separated from the extraction tank by a cation exchange membrane.
In one embodiment, the boron removal tank is separated from the anode compartment by a cation exchange membrane.
In one embodiment, the feed liquid tank is separated from the boron removal tank by an anion exchange membrane.
In one embodiment, the extraction cell is separated from the cathode chamber by an anion exchange membrane.
In an embodiment, the cathode and the anode are each independently selected from one of an Ag electrode and a Pt electrode.
The invention also provides a method for extracting lithium from a salt lake, which is carried out by adopting the device for extracting lithium from the salt lake and comprises the following steps of:
respectively introducing sodium chloride solution into the cathode chamber and the anode chamber, introducing water into the boron removal tank, introducing lithium-containing brine into the feed liquid tank, and introducing organic solution into the extraction tank;
and (3) applying voltage to the anode and the anode to react, adding a hydrochloric acid solution into the boron removal tank after the reaction is completed, standing and phase-separating in the extraction tank to obtain a lithium-containing organic phase, allowing the lithium-containing organic phase to enter the stripping tank, adding the hydrochloric acid solution into the stripping tank, and stripping lithium in the loaded organic phase to a water phase to obtain a lithium-rich solution.
In the process of extracting lithium in the electrodialysis tank, borate ions and cations in brine enter the boron removal tank and the extraction tank respectively under the action of an electric field, the formation of boric acid precipitation in the process of extracting lithium is effectively avoided to affect the extraction of lithium, in addition, the boron removal reaction is carried out during the process of extracting lithium, the brine is not required to be pretreated in advance for removing boron, the process is simplified, and the recovery rate and purity of lithium are effectively improved.
In one embodiment, the concentration of the sodium chloride solution is 0.1 to 1mol/L.
In one embodiment, the method for preparing the organic solution comprises the following steps: the preparation method of the organic solution comprises the following steps: mixing an extractant and a diluent to obtain a blank organic phase, preparing a mixed solution containing 0.5mol/L ferric trichloride and 0.5mol/L hydrochloric acid, uniformly mixing the mixed solution and the blank organic phase, oscillating, standing for phase separation, and uniformly mixing the organic phase and water to obtain an organic solution;
the mass ratio of the extractant to the diluent is (50-70): (30-50);
the volume ratio of the mixed solution to the blank organic phase is 1: (0.5-2);
the mass ratio of the organic phase to the water is (1-2): 1.
in one embodiment, the extractant is tributyl phosphate.
In one embodiment, the diluent is kerosene.
In one embodiment, the voltage applied to the anode and the anode is 0.8-1.2V, and the current density is 380-420A/m 2 The reaction time is 30-60 min.
In one embodiment, the stirring speed of the stirring paddle in the extraction tank is 400-600 rpm during the reaction.
In one embodiment, the volume ratio of the hydrochloric acid solution to the lithium-containing organic phase is (20-40): 1.
in one embodiment, the concentration of the hydrochloric acid solution is 0.2 to 6mol/L.
The beneficial effects of the method are as follows: (1) The method has the advantages that the extraction tank and the boron removal tank are arranged, in the lithium extraction process, cations of lithium-containing brine enter the extraction tank, an organic extraction system extracts lithium in an aqueous phase, a load organic phase and raffinate are obtained, anions such as borate enter the boron removal tank, boric acid precipitation is effectively avoided being formed in the lithium extraction process to affect the extraction of lithium, in addition, the boron removal reaction is carried out while the lithium extraction is carried out, the pretreatment of the brine for removing boron is not needed, the process is simplified, and the recovery rate and purity of lithium are effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a lithium extraction device in a salt lake herein.
The marks in the figure: 1. a feed liquid tank; 2. a cathode chamber; 3. an anode chamber; 4. an extraction tank; 5. a boron removal tank; 6. a back extraction tank; 7. a cation exchange membrane; 8. an anion exchange membrane; 9. an anode; 10. a cathode; 11. a positive electrode; 12. and a negative electrode.
Detailed Description
For a better description of the objects, technical solutions and advantages herein, the following description will be given with reference to specific examples and comparative examples, which are intended to be illustrative of the contents herein in detail, and not limiting thereof.
The component materials used in the examples and comparative examples herein were commercially available materials unless otherwise specified, and the component materials used in the parallel experiments were the same.
Example 1
As shown in fig. 1, this embodiment provides a salt lake lithium extraction device, including feed liquid groove 1, cathode chamber 2, positive pole room 3, extraction tank 4, remove boron groove 5, feed liquid groove 1, cathode chamber 2, positive pole room 3, extraction tank 4, remove boron groove 5 separate with the exchange membrane in proper order, extraction tank 4 is connected with stripping tank 6, be equipped with negative pole 10 in the cathode chamber 2, be equipped with positive pole 9 in the positive pole room 3, negative pole 10 with positive pole 9 sets up relatively.
In one embodiment, the cathode 10 is connected to a negative electrode 12 of a power source by a wire, and the anode 9 is connected to a positive electrode 11 of the power source by conduction.
In one embodiment, a stirring paddle is provided in the extraction tank 4.
More specifically, the feed liquid tank 1 is separated from the extraction tank 5 by a cation exchange membrane 7, the boron removal tank 4 is separated from the anode chamber 3 by a cation exchange membrane 7, the feed liquid tank 1 is separated from the boron removal tank 4 by an anion exchange membrane 8, and the extraction tank 4 is separated from the cathode chamber 2 by an anion exchange membrane 8.
Example 2
A method for extracting lithium from a salt lake, which is carried out by adopting the device for extracting lithium from the salt lake according to the embodiment 1, and comprises the following steps:
uniformly mixing TBP (tributyl phosphate) and kerosene according to a mass ratio of 60:40 to obtain a blank organic phase, mixing the blank organic phase with a solution containing 0.5mol/L ferric trichloride and 0.5mol/L hydrochloric acid according to a volume ratio of 1:1, oscillating, standing for phase separation to obtain an organic phase, and uniformly mixing the organic phase with water according to a volume ratio of 2:1 to obtain an organic solution;
respectively introducing 0.5mol/L sodium chloride solution into the cathode chamber and the anode chamber, introducing water into the boron removal tank, introducing lithium-containing brine into the feed liquid tank, and introducing organic solution into the extraction tank;
reacting anode and anode for 45min under the voltage of 1V and current density of 400A/m 2 And (3) adding 0.6mol/L hydrochloric acid solution into the boron removal tank until boric acid precipitation is formed after the reaction is finished, standing and phase-separating the extraction tank to obtain a lithium-containing organic phase, flowing out of the lower end of the extraction tank, entering the back extraction tank, mixing and reacting with 3mol/L hydrochloric acid solution for 30min, wherein the volume ratio of the lithium-containing organic phase to the hydrochloric acid is 20:1, and back-extracting lithium in the loaded organic phase to the water phase to obtain a lithium-rich solution.
Example 3
A method for extracting lithium from a salt lake, which is carried out by adopting the device for extracting lithium from the salt lake according to the embodiment 1, and comprises the following steps:
uniformly mixing TBP and kerosene according to a mass ratio of 50:50 to obtain a blank organic phase, mixing the blank organic phase with a solution containing 0.1mol/L ferric trichloride and 0.1mol/L hydrochloric acid according to a volume ratio of 1:1, oscillating, standing for phase separation to obtain an organic phase, and uniformly mixing the organic phase with water according to a volume ratio of 1:1 to obtain an organic solution;
respectively introducing 0.5mol/L sodium chloride solution into the cathode chamber and the anode chamber, introducing water into the boron removal tank, introducing lithium-containing brine into the feed liquid tank, and introducing organic solution into the extraction tank;
reacting for 30min with voltage of 0.8V and current density of 380A/m 2 And (3) adding 0.2mol/L hydrochloric acid solution into the boron removal tank until boric acid precipitation is formed after the reaction is finished, standing and phase-separating in the extraction tank to obtain a lithium-containing organic phase, flowing out of the lower end of the extraction tank, entering the back extraction tank, mixing with 1mol/L hydrochloric acid solution, reacting for 40min, wherein the volume ratio of the lithium-containing organic phase to the hydrochloric acid is 20:1, and back-extracting lithium in the loaded organic phase to the water phase to obtain a lithium-rich solution.
Example 4
A method for extracting lithium from a salt lake, which is carried out by adopting the device for extracting lithium from the salt lake according to the embodiment 1, and comprises the following steps:
uniformly mixing TBP and kerosene according to a mass ratio of 70:30 to obtain a blank organic phase, mixing the blank organic phase with a solution containing 1mol/L ferric trichloride and 1mol/L hydrochloric acid according to a volume ratio of 1:1, oscillating, standing for phase separation to obtain an organic phase, and uniformly mixing the organic phase with water according to a volume ratio of 2:1 to obtain an organic solution;
respectively introducing 0.5mol/L sodium chloride solution into the cathode chamber and the anode chamber, introducing water into the boron removal tank, introducing lithium-containing brine into the feed liquid tank, and introducing organic solution into the extraction tank;
reacting for 60min under the voltage of 1.2V and 4200A/m 2 And (3) adding 1mol/L hydrochloric acid solution into the boron removal tank until boric acid precipitation is formed after the reaction is finished, standing and phase-separating the extraction tank to obtain a lithium-containing organic phase, flowing out of the lower end of the extraction tank, entering the back extraction tank, mixing and reacting with 6mol/L hydrochloric acid solution for 20min, wherein the volume ratio of the lithium-containing organic phase to the hydrochloric acid is 20:1, and back-extracting lithium in the loaded organic phase to the water phase to obtain the lithium-rich solution.
Comparative example 1
A method for extracting lithium from a salt lake, which comprises the following steps:
organic phase preparation: uniformly mixing TBP and kerosene according to a mass ratio of 70:30 to obtain a blank organic phase, mixing the blank organic phase with a solution containing 1mol/L ferric trichloride and 1mol/L hydrochloric acid according to a volume ratio of 1:1, oscillating, standing for phase separation to obtain an organic phase, and uniformly mixing the organic phase with water according to a volume ratio of 2:1 to obtain an organic solution;
the organic phase and lithium-containing brine are mixed according to a volume ratio of 2: countercurrent extraction is carried out according to the proportion of 1 to obtain a lithium-containing organic phase and a raffinate water phase, and then the lithium-containing organic phase and 0.01mol/L hydrochloric acid washing liquid are subjected to volume ratio of 4:1, mixing and washing, and then mixing a lithium-containing organic phase with 6mol/L hydrochloric acid stripping agent according to a volume ratio of 20: and 1, carrying out countercurrent back extraction and phase separation to obtain a lithium-rich solution.
Performance testing
The components of the introduced lithium-containing brine in the examples are: 0.35g/L Li, 85.65g/LNa, 107.97g/LMg, 10.87g/L B, 8.45g/L K, 2.76g/L Ca, 10.54g/L SO 4 2- After lithium extraction by the methods of examples and comparative examples, respectivelyLithium ion concentration in the lithium-rich solution was measured using ICP to obtain lithium recovery and lithium purity as shown in the following table.
TABLE 1
It can be seen from table 1 that the method herein effectively avoids the influence of boric acid precipitation on lithium extraction during the lithium extraction, and the boron removal reaction is performed during the lithium extraction without pre-treating the brine in advance, thereby simplifying the process and effectively improving the recovery rate and purity of lithium.
Claims (15)
1. The utility model provides a salt lake draws lithium device, its characterized in that includes feed liquid groove, negative pole room, positive pole room, extraction tank, removes the boron groove, feed liquid groove, negative pole room, positive pole room, extraction tank, remove the boron groove and separate with the exchange membrane in proper order, the extraction tank is connected with the back extraction groove, be equipped with the negative pole in the negative pole room, be equipped with the positive pole in the positive pole room, the negative pole with the positive pole sets up relatively.
2. The lithium extraction device of claim 1, wherein the cathode is connected to a negative electrode of a power source by a wire, and the anode is connected to a positive electrode of the power source by conduction.
3. The lithium extraction device of claim 1, wherein stirring slurry is arranged in the extraction tank.
4. The lithium extraction device of claim 1, wherein the feed liquid tank is separated from the extraction tank by a cation exchange membrane; and/or
The boron removal tank is separated from the anode chamber by a cation exchange membrane.
5. The lithium extraction device of salt lake of claim 1 wherein the feed liquid tank is separated from the boron removal tank by an anion exchange membrane; and/or
The extraction tank is separated from the cathode chamber by an anion exchange membrane.
6. The lithium extraction device of claim 1, wherein the cathode and the anode are each independently selected from one of an Ag electrode and a Pt electrode.
7. A method for extracting lithium from a salt lake, which is characterized in that the method is carried out by adopting the device for extracting lithium from the salt lake according to any one of claims 1 to 6, and comprises the following steps:
respectively introducing sodium chloride solution into the cathode chamber and the anode chamber, introducing water into the boron removal tank, introducing lithium-containing brine into the feed liquid tank, and introducing organic solution into the extraction tank;
and (3) applying voltage to the anode and the anode to react, adding a hydrochloric acid solution into the boron removal tank after the reaction is completed, standing and phase-separating in the extraction tank to obtain a lithium-containing organic phase, allowing the lithium-containing organic phase to enter the stripping tank, adding the hydrochloric acid solution into the stripping tank, and stripping lithium in the loaded organic phase to a water phase to obtain a lithium-rich solution.
8. The method for extracting lithium from a salt lake according to claim 7, wherein the concentration of the sodium chloride solution is 0.1 to 1mol/L.
9. The method for extracting lithium from salt lake according to claim 7, wherein the method for preparing the organic solution comprises the following steps: mixing an extractant and a diluent to obtain a blank organic phase, preparing a mixed solution containing 0.5mol/L ferric trichloride and 0.5mol/L hydrochloric acid, uniformly mixing the mixed solution and the blank organic phase, oscillating, standing for phase separation, and uniformly mixing the organic phase and water to obtain an organic solution;
the mass ratio of the extractant to the diluent is (50-70): (30-50);
the volume ratio of the mixed solution to the blank organic phase is 1: (0.5-2);
the mass ratio of the organic phase to the water is (1-2): 1.
10. the method for extracting lithium from a salt lake according to claim 9, wherein the extractant is tributyl phosphate.
11. The method for extracting lithium from a salt lake according to claim 9, wherein the diluent is kerosene.
12. The method for extracting lithium from salt lake according to claim 7, wherein the voltage applied to the anode is 0.8 to 1.2V and the current density is 380 to 420A/m 2 The reaction time is 30-60 min.
13. The method for extracting lithium from salt lake according to claim 7, wherein the stirring rate of the stirring slurry in the extraction tank is 400 to 600rpm during the reaction.
14. The method for extracting lithium from salt lake according to claim 7, wherein the volume ratio of the hydrochloric acid solution to the lithium-containing organic phase is (20 to 40): 1.
15. the method for extracting lithium from a salt lake according to claim 7, wherein the concentration of the hydrochloric acid solution is 0.2 to 6mol/L.
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |