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Nanofiltration membrane for extracting lithium from salt lake as well as preparation method and application of nanofiltration membrane

A nanofiltration membrane and filter membrane technology, applied in the field of nanofiltration membranes and their preparation, can solve the problems of reducing the adsorption capacity and adsorption rate of lithium ion sieves, hindering the industrial application of lithium ion sieve membranes, and damaging powders, etc., and achieve excellent retention. performance, achieving industrialized mass production, and easy operation

Active Publication Date: 2022-03-15
江苏巨之澜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion sieve membrane can increase the surface area in contact with salt lake water, which is very convenient to apply, but the film formation will reduce the adsorption capacity and adsorption rate of lithium-ion sieve, and there will be damage or powder falling off during use, which will easily cause pollution , thus hindering the industrial application of lithium-ion sieve membranes

Method used

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  • Nanofiltration membrane for extracting lithium from salt lake as well as preparation method and application of nanofiltration membrane
  • Nanofiltration membrane for extracting lithium from salt lake as well as preparation method and application of nanofiltration membrane
  • Nanofiltration membrane for extracting lithium from salt lake as well as preparation method and application of nanofiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) Dry the polyimide polymer at 120°C, remove water for later use; dissolve 20wt% polyimide in N-methylpyrrolidone, stir and dissolve at 100°C for 6h, and wait for the polyimide After stirring and dissolving the raw materials completely, add 20wt% aminated silica nanoparticles, continue stirring and dissolving for 5 hours to obtain a uniform casting solution, stand for defoaming, and scrape the film to obtain an aminated silica modified with a loose porous structure. Polyimide polymer film;

[0050] (2) Configure a 500nm titanium-based lithium ion sieve solution with a concentration of 5wt%, fix the titanium-based lithium ion sieve in the membrane pores of the support layer by dead-end filtration, and obtain the titanium oxide lithium ion sieve in the loose porous support layer Aminated silica-modified polyimide nanofiltration membrane.

Embodiment 2

[0052] (1) Dry the polyimide polymer at 120°C, remove water for later use; dissolve 16wt% polyimide in N,N-dimethylformamide, stir and dissolve at 60°C for 3 hours, and wait for After the polyimide raw material is stirred and dissolved completely, add 15wt% aminated silicon dioxide nanoparticles, continue stirring and dissolving for 3 hours to obtain a homogeneous casting solution, leave it to defoam and scrape the film to obtain an aminated silicon dioxide with a loose porous structure. Silicon oxide modified polyimide polymer film;

[0053] (2) Configure a 300nm titanium-based lithium ion sieve solution with a concentration of 1wt%, fix the titanium-based lithium ion sieve in the membrane pores of the support layer by dead-end filtration, and obtain a porous support layer containing titanium oxide lithium ion sieve Aminated silica-modified polyimide nanofiltration membrane.

Embodiment 3

[0055] (1) Dry the polyimide polymer at 120°C, remove water for later use; dissolve 24wt% polyimide in N,N-dimethylacetamide, stir and dissolve at 120°C for 12h, and wait After the polyimide raw material is stirred and dissolved completely, add 25wt% aminated titanium dioxide nanoparticles, and continue stirring and dissolving for 6 hours to obtain a uniform casting solution. After standing for defoaming and scraping the film, an aminated titanium dioxide modified polyimide with a loose and porous structure is obtained. Polyimide polymer film;

[0056] (2) Configure a 2 μm titanium-based lithium ion sieve solution with a concentration of 10 wt%, fix the titanium-based lithium ion sieve in the membrane pores of the support layer by dead-end filtration, and obtain a porous support layer containing titanium oxide lithium ion sieve. Aminated titanium dioxide modified polyimide nanofiltration membrane.

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Abstract

The invention discloses a nanofiltration membrane based on membrane separation-adsorption synergistic salt lake lithium extraction and a preparation method and application thereof, a polyimide nanofiltration membrane is modified in situ by using an amino polymer one-step method through an immersion precipitation phase inversion technology, and a loose polyimide nanofiltration membrane with positive electricity is prepared. And fixing the lithium ion sieve adsorbent on the support layer of the loose polyimide nanofiltration membrane through a dead-end filtration technology, wherein the average pore size of the finally obtained nanofiltration membrane for extracting lithium from the salt lake is less than 1t. The composite material prepared by the preparation method has excellent retention performance on magnesium ions and has specific adsorption and permeation effects on lithium ions, so that the permeation rate of the lithium ions is improved. Therefore, the screening effect of the nanofiltration membrane is cooperated with the adsorption effect of the lithium ion sieve adsorbent, so that the magnesium-lithium separation efficiency is greatly improved; in addition, the nanofiltration membrane for extracting lithium from the salt lake is simple in preparation process, has more stable lithium extraction efficiency, and can be widely applied to but not limited to the fields of seawater, geothermal water and salt lake brine.

Description

technical field [0001] The invention relates to the technical field of polymer membranes, in particular to a nanofiltration membrane based on membrane separation-adsorption cooperative salt lake lithium extraction and its preparation method and application. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles, the application of lithium in the field of new energy materials has become increasingly prominent. The vigorous development of my country's lithium battery industry has brought opportunities to the lithium salt market, and the growing demand for lithium salt has prompted the vigorous development of lithium resources. According to the classification of the existing forms of lithium resources, the global lithium resources mainly include: solid lithium ore and salt lake brine type lithium ore, which account for 34% and 61% of the total reserves respectively, and other types of lithium resources (such as oil fields a...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/10B01D71/64C01D15/00C01D15/08
CPCB01D61/027B01D71/64B01D69/02B01D67/0079B01D69/10C01D15/00C01D15/08B01D2325/12B01D2325/16B01D2325/02Y02P10/20
Inventor 张晓红张清程陈大竞
Owner 江苏巨之澜科技有限公司
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