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A four-channel electrodialysis device for extracting lithium from salt lakes and a method for extracting lithium from salt lakes

An electrodialysis and four-channel technology, applied in electrodialysis, chemical instruments and methods, lithium carbonate;/acid carbonate, etc., can solve the problems of expensive ion membrane, low lithium recovery rate, and high cost , to avoid sulfate scaling, save dosing costs, and reduce floor space

Active Publication Date: 2020-11-17
杭州匠容道环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the various methods for extracting lithium from brine, the precipitation method, as a mature lithium extraction technology, has the disadvantages of high energy consumption, complicated process, and high cost, and the recovery rate of lithium is not high. Lithium extraction from brine with high magnesium and lithium ratio still needs to be improved
Solvent extraction method and ion exchange adsorption method are popular methods in recent years, but the ion exchange adsorption method has serious dissolution loss, expensive ion membrane and needs to be cleaned regularly.

Method used

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  • A four-channel electrodialysis device for extracting lithium from salt lakes and a method for extracting lithium from salt lakes

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Experimental program
Comparison scheme
Effect test

Embodiment A1～A3

[0041] Embodiment A1~A3: The four-channel electrodialysis device that is used for extracting lithium in salt lake

Embodiment A1

[0043] Such as figure 1 As shown, a four-channel electrodialysis device for extracting lithium from a salt lake includes a first electrodialysis circulation device 1, a second electrodialysis circulation device 2, a third electrodialysis circulation device 3, a fourth electrodialysis circulation device 4, An anolyte circulation device 5 and a catholyte circulation device 6; the first electrodialysis circulation device 1 includes a raw material liquid storage container 11, a first circulation pump 12 and a first desalination channel 13 which are sequentially connected through pipelines, and the raw material liquid storage container 1 is It is also provided with a raw material crude liquid input port and a treated raw material liquid discharge port; the second electrodialysis circulation device 2 includes an ion compensation liquid storage container 21, a second circulation pump 22, a second desalination channel 23 and an ion compensation liquid storage container 21 connected in ...

Embodiment A2

[0045] On the basis of Embodiment A1, in order to improve equipment efficiency, in the four-channel electrodialysis device used for extracting lithium from salt lakes in this embodiment, the first electrodialysis circulation device 1, the second electrodialysis circulation device 2, the third electrodialysis circulation device The dialysis circulation device 3 and the fourth electrodialysis circulation device 4 are several groups; several groups of the first electrodialysis circulation device 1, the second electrodialysis circulation device 2, the third electrodialysis circulation device 3 and the fourth electrodialysis circulation device 4 The four channels of electrodialysis formed by the two desalting channels and the two concentrating channels are arranged side by side in sequence between the anolyte channel 53 and the catholyte channel 63; that is, there are several groups of Four channels of electrodialysis; in specific implementation, the four channels of electrodialysis...

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Abstract

The invention discloses a four-channel electrodialysis device for extracting lithium from a salt lake and a method for extracting lithium from a salt lake in the related technical field of lithium salt production. The four-channel electrodialysis device comprises a first electrodialysis circulating device, a second electrodialysis circulating device, a third electrodialysis circulating device, a fourth electrodialysis circulating device, an anolyte circulating device and a catholyte circulating device, and four electrodialysis channels are formed. The method for extracting lithium from a saltlake comprises the steps of pretreatment, four-channel electrodialysis and evaporation precipitation. A four-channel electrodialysis module of a special structure is adopted, and the occupied area isreduced. The two steps of agent adding and lithium bicarbonate concentration are integrated, and the whole technological process of salt lake lithium extraction is shortened. The dosing cost is saved.The problem of sulfate scaling on the concentrated solution side of the electrodialysis unit is avoided. The process of preparing lithium carbonate by evaporation precipitation is simple to operate.

Description

technical field [0001] The invention relates to the technical field related to lithium salt production, in particular to a four-channel electrodialysis device for extracting lithium from a salt lake and a method for extracting lithium from a salt lake. Background technique [0002] Lithium (Li) and its compounds are widely used in electronics, metallurgy, chemical industry, medicine, energy and many other fields because of their excellent performance. They have a very important strategic position in the national economy and national defense construction, and are known as "the New Energy Metals", "Tomorrow's Aerospace Alloys". At the same time, the development and application of green and pollution-free lithium-ion power batteries have driven the vigorous development of the international lithium market. At present, the demand for lithium products in the international market is increasing at an annual rate of 7% to 11%, and its momentum will continue to be maintained. As an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/48C01D15/08
CPCB01D61/48B01D2311/2673C01D15/08Y02A20/124
Inventor 施小林肖彬彬
Owner 杭州匠容道环境科技有限公司
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