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

A technology of nanofiltration membrane and diaphragm, which is applied in the field of water treatment, can solve the problems of difficult separation and increased difficulty of lithium resource extraction, and achieve low roughness, large-scale production and commercialization, and strong controllability Effect

Pending Publication Date: 2021-12-10
WAVE CYBER SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium and boron are the two main impurities in salt lake brine. Due to the similar chemical properties of magnesium and lithium, it is difficult to separate them. At the same time, boron is contained in salt lake brine. Since boron has different forms at different pH, it also increases the concentration of lithium. Resource extraction difficulty

Method used

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

Examples

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Effect test

Embodiment 1

[0031] A nanofiltration membrane used to extract lithium from salt lakes is prepared by the following method:

[0032] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 24 hours, and scrape the casting solution directly on the free surface with a scraper. After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0033] S2. Immerse the support layer diaphragm in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire diaphragm in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a separation layer, drain the residual solution on the surface, and then After rinsing with deionized water for 5min, over 6% NaHSO 3 The solution was treated for 0.5 minutes, then immersed...

Embodiment 2

[0037] A nanofiltration membrane used to extract lithium from salt lakes is prepared by the following method:

[0038] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 24 hours, and scrape the casting solution directly on the free surface with a scraper. After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0039] S2. Immerse the support layer diaphragm in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire diaphragm in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a separation layer, drain the residual solution on the surface, and then After rinsing with deionized water for 5 minutes, treating with 6% NaHSO3 solution for 0.5 minutes, then immersing in...

Embodiment 3

[0043] A nanofiltration membrane used to extract lithium from salt lakes is prepared by the following method:

[0044] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 24 hours, and scrape the casting solution directly on the free surface with a scraper. After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0045]S2. Immerse the support layer diaphragm in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire diaphragm in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a separation layer, drain the residual solution on the surface, and then After rinsing with deionized water for 5 minutes, treating with 6% NaHSO3 solution for 0.5 minutes, then immersing in ...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a nanofiltration membrane for extracting lithium from a salt lake and a preparation method of the nanofiltration membrane. According to the invention, by using a conventional preparation process, (S)-2, 6-diamino-1-hexanol, polyvinyl alcohol and the like are added into a water phase for preparing a functional layer, and the addition amount of (S)-2, 6-diamino-1-hexanol, polyvinyl alcohol and the like is controlled to prepare a nanofiltration membrane, so that the magnesium-lithium ratio of salt lake brine with a high magnesium-lithium ratio is remarkably reduced after the salt lake brine passes through the nanofiltration system while a relatively good interception effect on boron is achieved, and the lithium extraction efficiency is effectively improved; the membrane is low in surface roughness, good in pollution resistance and low in operation cost; and the method is simple to operate and high in controllability, and large-scale production and commercialization are easy to realize.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a nanofiltration membrane used for extracting lithium from salt lakes and a preparation method thereof. Background technique [0002] Lithium is the lightest metal element in nature, and it ranks the first among group IA alkali metals in the periodic table, and is the lightest and most active alkali metal. Because of its wide range of applications, it is known as "industrial monosodium glutamate", and because lithium has the highest standard oxidation potential among various elements, it is the undisputed best element in the field of batteries and power supplies, so it is also called "energy metal". ". Lithium is widely used in batteries, ceramics, glass, lubricants, refrigerants, nuclear industry, and optoelectronic industries. With the continuous development of electronic products such as computers, digital cameras, mobile phones, and mobile electric tools, the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D61/02B01D61/08B01D67/00B01D69/02B01D69/10
CPCB01D71/56B01D69/105B01D69/02B01D67/0002B01D67/0006B01D61/027B01D61/08
Inventor 李莉程海涛郑周华谢建新
Owner WAVE CYBER SHANGHAI
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