CN109821499B - Whisker net fabric material for enriching lithium carbonate in salt lake brine and preparation method thereof - Google Patents
Whisker net fabric material for enriching lithium carbonate in salt lake brine and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 121
- 239000012267 brine Substances 0.000 title claims abstract description 66
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 66
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 title claims abstract description 35
- 229910052808 lithium carbonate Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004744 fabric Substances 0.000 title description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 32
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 30
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 30
- 238000001179 sorption measurement Methods 0.000 claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 18
- 239000011707 mineral Substances 0.000 claims abstract description 18
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 18
- 235000010755 mineral Nutrition 0.000 claims description 17
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000011775 sodium fluoride Substances 0.000 claims description 7
- 235000013024 sodium fluoride Nutrition 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000005325 percolation Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 5
- 150000002222 fluorine compounds Chemical class 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 5
- 238000003795 desorption Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical class [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910019400 Mg—Li Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- HEHRHMRHPUNLIR-UHFFFAOYSA-N aluminum;hydroxy-[hydroxy(oxo)silyl]oxy-oxosilane;lithium Chemical compound [Li].[Al].O[Si](=O)O[Si](O)=O.O[Si](=O)O[Si](O)=O HEHRHMRHPUNLIR-UHFFFAOYSA-N 0.000 description 1
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052629 lepidolite Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910052670 petalite Inorganic materials 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 229910052642 spodumene Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a whisker mesh material for enriching lithium carbonate in salt lake brine and a preparation method thereof, wherein a manually built 'porous' adsorption material consisting of mullite whiskers and montmorillonite interlamination materials which are mineral materials and a fluoride which is a lithium ion affinity additive is used as main raw materials, can widely adsorb solute in a solution, particularly has a better adsorption and enrichment effect on lithium carbonate, can enrich the concentration of lithium ions in the salt lake brine to more than 1.5g/L, and can be desorbed, regenerated and recycled.
Description
Technical Field
The invention relates to the field of synthesis of adsorption materials, in particular to enrichment of lithium salts in salt lakes, and specifically relates to a whisker mesh material for enriching lithium carbonate in salt lakes and a preparation method thereof.
Background
The appearance of the lithium ion battery enables lithium element to be 'new and expensive' in energy, and the lithium element mainly exists in two types in nature, namely the lithium element exists in rock ore forms such as spodumene, lepidolite and petalite, and the lithium element exists in salt lake brine, underground brine and seawater in a lithium ion form. The Tibet Zaubu salt lake which occupies the greatest proportion of lithium resources in China is the only natural lithium carbonate salt lake in the world, and the current lithium carbonate production process of the Zaubu salt lake is a solar pond crystallization method. The Zabuya salt lake brine belongs to Na+、K+//Cl-、CO3 2-、SO4 2--H2O quinary system, lake water Mg-Li ratioLower (Mg/Li)<0.1), lithium carbonate can be directly crystallized and separated out from salt lake water, but the solar cell crystallization technology has a bottleneck problem at present: the lithium ion concentration can be separated from the carbonate of other ions according to the property that the solubility of lithium carbonate is reduced along with the temperature rise only when the lithium ion concentration reaches more than 1.5g/L, however, the lithium ion concentration is seriously influenced by the fluctuation of the climatic conditions, the lithium ion concentration can only reach 0.5g/L in 2-3 seasons of the whole year, only 1-2 seasons of the whole year can normally adopt the solar cell crystallization technology to produce lithium carbonate practically, and the production period is overlong.
The problem of lithium ion enrichment is solved, and the method has great significance for realizing continuous and stable production of lithium carbonate from salt lake brine.
Disclosure of Invention
The invention aims to provide a whisker mesh material for enriching lithium carbonate in salt lake brine and a preparation method thereof, and the principle is as follows: the preparation method comprises the steps of mixing powders of mullite whiskers and montmorillonite interlamination materials which are mineral materials in proportion, soaking the powders in a fluoride saturated solution, filtering and separating, drying and calcining separated mixed solid substances to form a fluoride-containing mullite whisker-montmorillonite interlamination modified mineral material, and performing compression molding to finally obtain a whisker mesh material capable of enriching lithium carbonate in salt lake brine, wherein the artificially-built 'porous' adsorption material consisting of the whisker materials, the interlamination materials and a lithium-philic ion additive can widely adsorb solute in the solution, has a broad-spectrum adsorption effect on alkali metal, alkaline earth metal ions, carbonate, phosphate radical, organic phosphorus, pigment and the like, has a better adsorption enrichment effect on lithium carbonate than other solutes, and is subjected to sun drying in rich west Tibetan, soaking the lithium carbonate solution again by using original brine, namely salt lake brine with the lithium ion content of 0.5g/L, airing the lithium carbonate solution in sunlight for the second time, soaking the lithium carbonate solution again by using the original brine for the third time, wherein the concentration of the lithium ions in the percolated solution is more than 1.5g/L, and repeating the steps to realize continuous lithium carbonate adsorption and enrichment; after long-term use, the block material of the whisker net material can lose effectiveness, and the block material can be put into water to be scattered and then regenerated according to the steps (1) to (4) described later, thereby realizing the desorption and regeneration cycle use of the adsorption material. The principle that the lithium carbonate can be desorbed from the material and recycled is as follows: after adsorption is completed, a porous space is manually built by stirring and dispersing the whisker net material, so that the hole bearing the adsorption function does not exist, and the adsorbed substance is naturally desorbed again, thereby realizing the recycling of the adsorption material, and further separating and purifying the lithium carbonate and other substances are realized by a process of 'solar cell crystallization technology' which has mature follow-up technology.
The invention has the advantages that: 1. the raw material main body for preparing the material belongs to mineral materials, and has wide sources, low cost and environmental friendliness; 2. experiments are carried out by using Zabuye salt lake brine, the concentration of lithium ions in the brine after adsorption and enrichment is more than 1.5g/L, and the requirement of a solar pond crystallization technology on the content of the lithium ions in the brine is met; 3. the whisker net material for enriching the lithium carbonate in the salt lake brine is different from the traditional adsorption material, and the adsorbed substance is easy to desorb, so that the adsorption material can be recycled.
The innovation points of the invention are as follows: 1. the adsorbing material capable of enriching the lithium carbonate in the aqueous solution and the preparation method are obtained; 2. a new material with adsorption and desorption effects for adsorption-desorption cycle use and a preparation method thereof are obtained; 3. provides a way for enriching lithium carbonate for a solar cell crystallization technology for extracting lithium from salt lake brine, and solves the bottleneck problem of continuous and stable production of lithium carbonate in the salt lake brine by the solar cell crystallization method.
The invention is carried out according to the following steps:
(1) mixing of raw materials
Taking 10 parts of mullite whisker and 1-10 parts of montmorillonite interlaminar material according to the mass parts (the following dosage is the mass parts), stirring and mixing, adding saturated fluoride aqueous solution which is 2-5 times of the total volume of the mullite whisker and the montmorillonite interlaminar material, stirring, soaking for more than 1 hour, and then filtering and separating to obtain mixed solid substances, wherein the fluoride refers to sodium fluoride and ammonium fluoride.
(2) Drying of mixed solid substances
Drying the obtained mixed solid wet material at 130-180 deg.c for 2-6 hr, and if the temperature is too low, the drying time is too long, and if the temperature is too high, the fluoride will react with mineral material to produce silicon fluoride and volatilize.
(3) Calcining the dried mixed solid substance
And putting the dried product into a box type electric furnace, heating the product from room temperature to 220-350 ℃ along with the furnace, and roasting the product for 2.0-5.0 hours to obtain a loose blocky fluoride-containing mullite whisker-montmorillonite interbedded modified mineral material primary product.
(4) Press forming of material preform
The primary product of the fluoride-containing mullite whisker-montmorillonite interlaminar modified mineral material is pressed and molded by a press machine to obtain a finished product of the whisker net material enriched with lithium carbonate in salt lake brine, the purpose of pressing the material is to form a manually built 'porous' material by the whisker material and the interlaminar material, the shape of the material has no influence on the adsorption effect of the material, and the material is uniformly pressed into a strip shape of 5 multiplied by 3 cm in the experiment for unifying the experiment conditions and simplifying the experiment period; the pressure has great influence on the adsorption effect, the pressure can meet the requirement by pressing with a 10-ton hydraulic press, the compressive strength of the product is 3-10MPa, and the concentration of lithium ions in the brine after enrichment is more than 1.5 g/L.
(5) Adsorption of salt lake brine
Putting the salt lake raw brine with the lithium ion content of 0.5g/L into a crystal whisker net material block material according to the solid-liquid volume ratio of 1:2-1:3, and if the brine is too little, namely the solid-liquid volume ratio is more than 1:2-1:3, completely absorbing the brine; if the brine is too much, namely the solid-liquid volume ratio is less than 1:2-1:3, the adsorption and enrichment effects can not meet the requirement that the concentration of lithium ions is 1.5g/L, and the soaking time is 10-20 minutes.
(6) Desorption and recycling of solutes
And (2) drying the whisker net fabric block material adsorbed with the salt lake original brine in the sun with abundant Tibet for 2-3 hours, re-soaking with the original brine, namely the salt lake brine with the lithium ion content of 0.5g/L, wherein the soaking conditions are the same, drying in the sun for the second time, re-soaking with the original brine for the third time, wherein the soaking conditions are the same, the concentration of the lithium ions in the solution obtained by percolation is more than 1.5g/L, and repeating the steps to realize continuous lithium carbonate adsorption and enrichment.
After long-term use, if the block material of the whisker net material is invalid, the block material can be put into water to be scattered and regenerated according to the steps from (1) to (4), thereby realizing desorption and regeneration recycling of the adsorption material.
Drawings
FIG. 1 is an SEM image of a whisker mesh material obtained according to example 1.
Detailed Description
Example 1: mixing 10 parts of mullite whisker and 1 part of montmorillonite interlaminar material by stirring, adding a saturated sodium fluoride aqueous solution of which the volume is 2 times that of the mullite whisker and the montmorillonite interlaminar material by stirring, soaking for 1 hour after stirring, and then filtering and separating; drying the mixed solid in an oven at 130 ℃ for 6 hours; putting the dried product into a box-type electric furnace, heating the product from room temperature to 220 ℃ along with the furnace, and roasting the product at 220 ℃ for 2.0 hours to obtain loose blocky mullite whisker-montmorillonite interlamination modified mineral material primary products containing sodium fluoride; pressing the primary mullite whisker-montmorillonite interbedded modified mineral material product containing sodium fluoride into a strip of 5 multiplied by 3 cm by a 10-ton hydraulic press to obtain a material with the compressive strength of 3 MPa; putting the crystal whisker net material block material into salt lake raw brine with the lithium ion content of 0.5g/L, wherein the volume ratio of the material to the brine is 1:2, and soaking for 10 minutes; after the block material of the whisker net material absorbed with the salt lake original brine is dried in the sun for 2 hours, the block material is soaked again with the original brine, namely the salt lake brine with the lithium ion content of 0.5g/L for 10 minutes, and after the drying in the sun for 2 hours again, the block material is soaked again with the original brine for 10 minutes for the third time, and the concentration of the lithium ions in the solution obtained by percolation is measured to be 16.6 g/L.
Example 2: mixing 10 parts of mullite whisker and 5 parts of montmorillonite interlaminar material by stirring, adding a saturated sodium fluoride aqueous solution which is 3 times of the total volume of the mullite whisker and the montmorillonite interlaminar material, stirring, soaking for 2 hours, and then filtering and separating; drying the mixed solid in a drying oven at 150 ℃ for 5 hours; putting the dried product into a box-type electric furnace, heating the product from room temperature to 300 ℃ along with the furnace, and roasting the product at 300 ℃ for 3.0 hours to obtain a loose blocky mullite whisker-montmorillonite interlamination modified mineral material primary product containing sodium fluoride; pressing the primary mullite whisker-montmorillonite interbedded modified mineral material product containing sodium fluoride into a strip of 5 multiplied by 3 cm by a 10-ton hydraulic press to obtain a material with the compressive strength of 5 MPa; putting the crystal whisker net material block material into salt lake raw brine with the lithium ion content of 0.5g/L, wherein the volume ratio of the material to the brine is 1:2.5, and soaking for 15 minutes; after the block material of the whisker net material absorbed with the salt lake original brine is dried in the sun for 2.5 hours, the block material is soaked again with original brine, namely the salt lake brine with the lithium ion content of 0.5g/L for 15 minutes, after the block material is dried in the sun for 2.5 hours again, the block material is soaked again with original brine for 15 minutes for the third time, and the concentration of the lithium ions in the solution obtained by percolation is measured to be 16.8 g/L.
Example 3: mixing 10 parts of mullite whisker and 8 parts of montmorillonite interlaminar material by stirring, adding a saturated ammonium fluoride aqueous solution of which the volume is 5 times that of the mullite whisker and the montmorillonite interlaminar material by stirring, soaking for 3 hours after stirring, and then filtering and separating; drying the mixed solid in a drying oven at 160 ℃ for 4 hours; putting the dried product into a box-type electric furnace, heating the product from room temperature to 350 ℃ along with the furnace, and roasting the product at 350 ℃ for 4.5 hours to obtain a loose blocky ammonium fluoride-containing mullite whisker-montmorillonite interlamination modified mineral material primary product; pressing the primary mullite whisker-montmorillonite interbedded modified mineral material product containing ammonium fluoride into a strip of 5 multiplied by 3 cm by a 10-ton hydraulic press, wherein the compressive strength of the obtained material is 9.5 MPa; putting the crystal whisker net material block material into salt lake raw brine with the lithium ion content of 0.5g/L, wherein the volume ratio of the material to the brine is 1:2.5, and soaking for 20 minutes; after the block material of the whisker net material absorbed with the salt lake original brine is dried in the sun for 3 hours, the block material is soaked again with the original brine, namely the salt lake brine with the lithium ion content of 0.5g/L for 20 minutes, and after the drying in the sun for 3 hours for the second time, the block material is soaked again with the original brine for 20 minutes for the third time, and the concentration of the lithium ions in the solution obtained by percolation is measured to be 17.8 g/L.
Example 4: mixing 10 parts of mullite whisker and 6 parts of montmorillonite interlaminar material by stirring, adding a saturated ammonium fluoride aqueous solution which is 4 times of the total volume of the mullite whisker and the montmorillonite interlaminar material, stirring, soaking for 5 hours, and then filtering and separating; drying the mixed solid in an oven at 170 ℃ for 3 hours; putting the dried product into a box-type electric furnace, heating the product from room temperature to 330 ℃ along with the furnace, and roasting the product at 330 ℃ for 5 hours to obtain loose blocky ammonium fluoride-containing mullite whisker-montmorillonite interlamination modified mineral material primary products; pressing the primary mullite whisker-montmorillonite interbedded modified mineral material product containing ammonium fluoride into a strip of 5 multiplied by 3 cm by a 10-ton hydraulic press, wherein the compressive strength of the obtained material is 6.5 MPa; putting the crystal whisker net material block material into salt lake raw brine with the lithium ion content of 0.5g/L, wherein the volume ratio of the material to the brine is 1:3, and soaking for 10 minutes; after the block material of the whisker net material absorbed with the salt lake original brine is dried in the sun for 3 hours, the block material is soaked again with the original brine, namely the salt lake brine with the lithium ion content of 0.5g/L for 10 minutes, and after the drying in the sun for 3 hours for the second time, the block material is soaked again with the original brine for 10 minutes for the third time, and the concentration of the lithium ions in the solution obtained by percolation is measured to be 1.73 g/L.
Claims (5)
1. The whisker net material for enriching the lithium carbonate in the salt lake brine is characterized in that: the composite material comprises the following raw materials in parts by mass: 10 parts of mullite whisker, 1-10 parts of montmorillonite interlaminar material and 2-5 times of saturated aqueous fluoride solution of the total volume of the mullite whisker and the montmorillonite interlaminar material, wherein the fluoride refers to sodium fluoride and ammonium fluoride.
2. The method for preparing the whisker net material rich in lithium carbonate in salt lake brine according to claim 1, which is characterized in that: mixing 10 parts of mullite whisker and 1-10 parts of montmorillonite interlaminar material by stirring, adding a saturated fluoride aqueous solution of which the volume is 2-5 times that of the mullite whisker and the montmorillonite interlaminar material by volume, stirring, soaking for more than 1 hour, and then filtering and separating to obtain a mixed solid substance, wherein the fluoride refers to sodium fluoride and ammonium fluoride; drying the obtained mixed solid wet material at 130-180 ℃ for 2-6 hours; putting the dried product into a box type electric furnace, heating the product from room temperature to 220-350 ℃ along with the furnace, and roasting the product for 2.0-5.0 hours to obtain a loose blocky fluoride-containing mullite whisker-montmorillonite interbedded modified mineral material primary product; and (3) pressing and molding the fluoride-containing mullite whisker-montmorillonite interlaminar modified mineral material primary product by a press machine to obtain a finished product of the whisker mesh material enriched with lithium carbonate in salt lake brine.
3. The method for preparing the whisker net material rich in lithium carbonate in salt lake brine according to claim 2, which is characterized in that: in the experiment, primary products of fluoride-containing mullite whisker-montmorillonite interbedded modified mineral materials are uniformly pressed into strips of 5 multiplied by 3 cm; the requirement can be met by pressing with a 10-ton hydraulic press, and the compressive strength of the finished product of the whisker mesh material enriched with lithium carbonate in salt lake brine obtained by pressing forming is 3-10 MPa.
4. The method for preparing the whisker net material rich in lithium carbonate in salt lake brine according to claim 2, which is characterized in that: putting the salt lake raw brine with the lithium ion content of 0.5g/L into a crystal whisker net material block material, and soaking for 10-20 minutes according to the solid-liquid volume ratio of 1:2-1: 3.
5. The method for preparing the whisker net material rich in lithium carbonate in salt lake brine according to claim 2, which is characterized in that: after the crystal whisker net material block material absorbed with the salt lake original brine is dried in the sun for 2 to 3 hours, the original brine, namely the salt lake brine with the lithium ion content of 0.5g/L is soaked again according to the solid-liquid volume ratio of 1:2 to 1:3, and the soaking time is 10 to 20 minutes; and after sun-drying for the same time, soaking the lithium carbonate in the original brine for the third time according to the solid-liquid volume ratio of 1:2-1:3, wherein the soaking time is 10-20 minutes, the concentration of lithium ions in the solution obtained by percolation after soaking is more than 1.5g/L, and the steps are repeated to realize continuous lithium carbonate adsorption and enrichment.
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