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Lithium extraction system driven by salinity difference

A technology of salt difference and concentrated brine, applied in the field of lithium extraction, can solve the problems of huge cost investment, time-consuming, power consumption and other problems, and achieve the effects of high efficiency, low cost and low cost

Active Publication Date: 2020-03-20
WUHAN UNIV
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Problems solved by technology

[0005] However, the above-mentioned existing method has cumbersome steps, and a whole set of steps takes a lot of time; each individual step needs to prepare a separate device, and the cost is huge; the whole process needs to consume high-grade energy such as electric energy

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  • Lithium extraction system driven by salinity difference

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Embodiment Construction

[0019] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 The shown lithium extraction system driven by salt difference includes a concentrated brine chamber 2, an ordinary seawater chamber 8 and an anion exchange membrane 6, the concentrated brine chamber 2 is filled with concentrated brine, and the ordinary seawater chamber 8 is filled with ordinary seawater; The anion exchange membrane 6 is arranged between the concentrated brine chamber 2 and the ordinary seawater chamber 8, and anions can flow between the concentrated brine chamber 2 and the ordinary seawater chamber 8 through the anion exchange membrane 6; Lithium element adsorption electrode 3 in concentrated brine is provided with electrode plate 7 immersed in ordinary seawater in ordinary seawater chamber 8, and lithium element adsorption electrode 3 is connected to ...

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Abstract

The invention discloses a lithium extraction system driven by salinity difference. The lithium extraction system comprises a strong brine cavity, a common seawater cavity and an anion exchange membrane, wherein the strong brine cavity is filled with strong brine, and the common seawater cavity is filled with common seawater; the anion exchange membrane is arranged between the strong brine cavity and the common seawater cavity, and anions can flow between the strong brine cavity and the common seawater cavity through the anion exchange membrane; a lithium element adsorption electrode immersed in the strong brine is arranged in the strong brine cavity; an electrode plate immersed in the common seawater is arranged in the common seawater cavity; and the lithium element adsorption electrode isconnected with the electrode plate through a wire led out of the electrode plate. The lithium extraction system has the beneficial effects that the salinity gradient energy is used as driving energyto realize cation enrichment so as to accelerate the absorption of the lithium element, and other high-grade energy does not need to be consumed additionally; and the salinity gradient energy serves as the unique driving energy, and no high-quality energy is consumed, so the system is low in cost and can be used for industrial continuous lithium extraction.

Description

technical field [0001] The invention relates to the technical field of lithium extraction, in particular to a lithium extraction system driven by salt difference. Background technique [0002] With the rapid development of lithium-ion batteries, the demand for lithium carbonate in various countries in the world has increased rapidly. In 2015, the world's demand for lithium carbonate was 265 thousand tons, and by 2025, the whole world will need 498 thousand tons of lithium carbonate [1]. Lithium ions have gradually become a scarce resource that the entire world is competing for. The current lithium extraction technologies mainly include adsorption method, reverse osmosis method and extraction method. The adsorption method consumes adsorbent and has low adsorption efficiency; the reverse osmosis method needs to consume high-grade electric energy as a drive to separate lithium ions; the extraction method is complicated to operate. It requires a lot of manual input. The tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
CPCC01D15/00
Inventor 胡雪蛟江海峰洪子鑫操斌牛静欧阳少峰
Owner WUHAN UNIV
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