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

A technology of nanofiltration membrane and bottom membrane, which is applied in the field of nanofiltration membrane, can solve the problems of insufficient lithium ion separation effect and low lithium ion rejection rate, and achieve the goal of improving mechanical strength, improving hydrophilicity and improving dispersibility Effect

Active Publication Date: 2022-04-22
GUANGDONG TAIQUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanofiltration membrane can retain a large amount of magnesium ions, and the rejection rate of lithium ions is low. However, some lithium ions will still be retained, which cannot achieve a good separation effect on lithium ions.

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

Experimental program
Comparison scheme
Effect test

preparation example 1

[0042] A modified polyphenylsulfone prepared by the following method:

[0043] Put 10kg polyphenylsulfone into 100L chloroform solution, stir for 40min, then add 6kg chlorosulfonic acid, stir for 1.5h, stir for 15min, filter, wash the membrane with water 4 times, dry the solid at 65°C for 40min, A modified polyphenylsulfone was obtained.

Embodiment 1

[0046] A nanofiltration membrane for extracting lithium from a salt lake comprises a bottom membrane and a polyamide layer formed on the bottom membrane.

[0047] A preparation method of a nanofiltration membrane for extracting lithium from a salt lake, comprising the steps of:

[0048] S1: Preparation of aqueous phase solution: add 10 kg of piperazine to 90 kg of water, stir for 30 min, then add 2 kg of nano-zinc oxide, and stir for 15 min to obtain an aqueous phase solution;

[0049] S2: Preparation of oil phase solution: mix 7 kg of trimesoyl chloride and 85 kg of toluene, and stir for 40 min to obtain an oil phase solution;

[0050] S3: Interfacial polymerization: take a smooth glass plate of 50cm*50cm*5cm, wash it with water, and dry it at 25°C for 3 hours, and put it in the In 30kg N,N-dimethylacetamide, stir for 45min, then pour it on a glass plate, scrape the surface, immediately put the glass plate in 10kg N-methylpyrrolidone at 10°C, and the modified polyphenylsulfo...

Embodiment 2

[0053] A method for preparing a nanofiltration membrane for extracting lithium from a salt lake, which differs from Example 1 in that the amount of nano-zinc oxide added in step S1 is 4 kg.

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Abstract

The invention relates to the technical field of nanofiltration membranes, and particularly discloses a nanofiltration membrane for extracting lithium from a salt lake and a preparation method of the nanofiltration membrane. The nanofiltration membrane comprises a bottom membrane and a polyamide layer formed on the bottom membrane, the bottom membrane is modified polyphenyl sulfone, the modified polyphenyl sulfone is prepared by modifying polyphenyl sulfone with chlorosulfonic acid, and nano-zinc oxide is contained in the polyamide layer and on the surface of the polyamide layer; the preparation method comprises the following steps: adding polyamine into water, uniformly mixing, adding nano zinc oxide, and uniformly mixing to obtain a water-phase solution; uniformly mixing polyacyl chloride and an organic solution to obtain an oil phase solution; and immersing the base membrane into the water phase solution for 2-8 minutes, taking out the base membrane, removing excess water on the surface, immersing the base membrane into the oil phase solution for 0.5-2 minutes, taking out the base membrane, removing excess oil on the surface, and carrying out heat treatment to obtain the nanofiltration membrane. The nanofiltration membrane for extracting lithium from the salt lake has the advantage of improving the separation effect on lithium ions through the synergistic effect of the raw materials.

Description

technical field [0001] The present application relates to the technical field of nanofiltration membranes, in particular to a nanofiltration membrane for extracting lithium from salt lakes and a preparation method thereof. Background technique [0002] Lithium resource is an important metal resource, which is widely used in the field of lithium batteries. With the rapid development of the new energy field, the market demand for lithium resources has increased sharply, so it is particularly important to effectively develop products such as metal lithium and lithium salts. Lithium resources mainly exist in ores, salt lakes and seawater, especially in salt lakes. However, the ratio of magnesium to lithium in salt lakes is high, and the separation of magnesium and lithium is difficult. As a result, the amount of lithium extracted from salt lakes is only 8% of the total extraction. [0003] At present, the main method for extracting lithium from salt lakes is to use nanofiltrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/12C02F1/44
CPCB01D71/68B01D69/125B01D67/0006C02F1/442
Inventor 王诗文谢兵
Owner GUANGDONG TAIQUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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