Process for enriching lithium in salt lake brine

A salt lake brine and enrichment technology, applied in the field of separation and recovery of magnesium and lithium in salt lake brine, can solve the problems of ion enrichment efficiency, process cost increase, osmotic pressure increase, etc., so as to reduce energy consumption and membrane fouling. The effect of blocking and improving the concentration effect

Active Publication Date: 2022-08-09
BEIJING WANBANGDA ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

At present, although the existing membrane separation technology separates magnesium and lithium ions to a certain extent and realizes the enrichment of lithium ions, due to the increase of osmotic pressure in each membrane stage during the enrichment process, the ion enrichment efficiency and process cost Increase

Method used

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  • Process for enriching lithium in salt lake brine

Examples

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Embodiment Construction

[0033] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the following examples will be further described. It should be understood that the following examples are only used to illustrate the present invention and not to limit the scope of the present invention. In the examples, the methods used are conventional methods unless otherwise specified, and the equipment used can be obtained through commercial channels.

[0034] After the salt lake brine is filtered, adsorbed and decomposed, the concentration of lithium ions in the desorption solution is 800 mg / L, the concentration of magnesium ions is 400 mg / L, the mass ratio of magnesium ions to lithium ions is 1:2, and the salt content is 7800 mg / L. In this example, the flow rate is 250m 3 / h.

[0035] In the embodiment, the recovery rate of lithium ions at each stage is calculated in the following manner: recovery rate of lithium ions=(water production amount×lithium ion co...

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Abstract

The invention belongs to the technical field of solution purification and separation, and discloses a process for enriching lithium in salt lake brine. After being pretreated, salt lake brine respectively passes through an adsorption device, an ultrafiltration device, a primary nanofiltration device, a reverse osmosis device I, a secondary nanofiltration device and an electrodialysis device to obtain a solution which can be directly used for preparing high-purity lithium. In order to reduce the pressure difference of the two sides of a reverse osmosis membrane and improve the recovery rate of lithium ions, electrodialysis produced water is conveyed to a reverse osmosis device I and mixed with reverse osmosis produced water I to serve as rear-end effluent of the reverse osmosis device I; an independent reverse osmosis device II is arranged to concentrate outlet water at the rear end of the reverse osmosis device I, and reverse osmosis concentrated water II and secondary nanofiltration produced water are mixed and then enter an electrodialysis device. The enrichment process provided by the invention is low in energy consumption and high in lithium recovery rate.

Description

technical field [0001] The invention belongs to the technical field of solution purification and separation, in particular to the separation and recovery of magnesium and lithium in salt lake brine. Background technique [0002] Lithium-ion batteries have the advantages of low cost and long service life, and gradually replace chemical batteries as the darling of energy storage devices. With the increase in the production and sales of new energy vehicles, the demand for lithium-ion batteries will also increase, and new energy vehicles will become the main field of lithium consumption growth in the future. Therefore, battery-grade lithium carbonate is called "energy upstart in the 21st century". Lithium ions mainly exist in nature as solid mineral resources (spodumene, lepidolite, etc.) and liquid mineral resources (salt lake brine, seawater, oil field water, etc.). The lithium resource reserves of salt lake brine account for about 70% to 80% of the total lithium resources. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/58C01D15/00
CPCB01D61/58C01D15/00Y02P10/20
Inventor 梁琪范飞牟志强黄珂赵磊韩晓欢朱芙蓉王飘扬
Owner BEIJING WANBANGDA ENVIRONMENTAL PROTECTION TECH
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