Extraction system and method for separating magnesium from magnesium-containing brine to extract lithium through secondary amide/trialkyl phosphate composite solvent, and application of extraction method

A technology of trialkyl phosphate and composite solvent, which is applied in the direction of lithium halide, lithium carbonate;/acid carbonate, process efficiency improvement, etc., can solve the problem that the extraction system has not been discovered, and the large-scale test of the extraction agent has not been completed Verification and screening and other issues to achieve the effect of reducing acid and alkali consumption, simple structure, and easy production

Active Publication Date: 2020-02-11
XIANGTAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, in general, the extraction method has not yet completed the large-scale test verificat

Method used

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  • Extraction system and method for separating magnesium from magnesium-containing brine to extract lithium through secondary amide/trialkyl phosphate composite solvent, and application of extraction method
  • Extraction system and method for separating magnesium from magnesium-containing brine to extract lithium through secondary amide/trialkyl phosphate composite solvent, and application of extraction method
  • Extraction system and method for separating magnesium from magnesium-containing brine to extract lithium through secondary amide/trialkyl phosphate composite solvent, and application of extraction method

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Li in brine of a salt lake in Qaidam Basin, Qinghai + and Mg 2+ The content is 2.00g / L and 113.43g / L respectively, the mass ratio of magnesium and lithium is 56.67:1, of which Na + , K + , Cl - , and B 2 O 3 The contents are 3.83, 1.60, 325.98, 44.00 and 8.14g / L respectively, and the brine density is 1.34g / cm 3 , the pH value of brine is 4.3. Get 10mL this kind of bittern in 100mL ground conical flask, then add 21mL N-iso-octyl butanamide as extractant and 9mL tributyl phosphate as coextractant, organic phase and salt lake brine volume ratio are 3: 1. Put the magnet in the conical flask, insert the matching air condenser tube into the bottle mouth to prevent the liquid from splashing, put it in the DF-101S type heat-collecting constant temperature heating magnetic stirrer, mix and stir at 20℃, and extract for 20min. Then, the mixed liquid was transferred to a 250mL plastic test tube, and centrifuged at 4500r / min for 15min in an LD5-10 desktop centrifuge. Tran...

Embodiment 2

[0058] Get 21mL N-isoamyl octanamide as extractant and 9mL triisooctyl phosphate as coextractant in 100mL ground conical flask, then add 10mL salt lake brine in Example 1, organic phase and salt lake brine The volume ratio is 3:1. Put the magnet in the conical flask, insert the matching air condenser tube into the bottle mouth to prevent the liquid from splashing, put it in the DF-101S type heat-collecting constant temperature heating magnetic stirrer, mix and stir at 20 ℃, and extract for 30 minutes. Then the mixed liquid was transferred to a 250mL plastic test tube, and centrifuged at 4500r / min for 15min in an LD5-10 desktop centrifuge. Transfer the loaded organic phase to another 100mL ground-mouth conical flask, add deionized water in a volume ratio of 1:6 to the organic phase, and place it in a DF-101S collector-type constant temperature heating magnetic stirrer. Back-extraction was carried out at °C, and the two phases were mixed for 30 min. The mixed liquid was then t...

Embodiment 3

[0064] Get 24mL N-isoamyl octanamide as extractant and 6mL triisodecyl phosphate as coextractant in 100mL ground conical flask, then add 10mL salt lake brine in Example 1, organic phase and salt lake brine The volume ratio is 3:1. Put the magnet in the conical flask, insert the matching air condenser tube into the bottle mouth to prevent the liquid from splashing, put it in the DF-101S type heat-collecting constant temperature heating magnetic stirrer, mix and stir at 20 ℃, and extract for 30 minutes. Then, the mixed liquid was transferred to a 250mL plastic test tube, and centrifuged at 4500r / min for 15min in an LD5-10 desktop centrifuge. Transfer the loaded organic phase to another 100mL ground-mouth conical flask, add deionized water in a volume ratio of 1:4 to the organic phase, and place it in a DF-101S collector type constant temperature heating magnetic stirrer. Back-extraction was carried out at °C, and the two phases were mixed for 30 min. The mixed liquid was then ...

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Abstract

The invention discloses an extraction system and method for separating magnesium from magnesium-containing brine to extract lithium through a secondary amide/trialkyl phosphate composite solvent, andapplication of the extraction method. The extraction system contains secondary amide and trialkyl phosphate which are each constituted by a single compound or a mixture of two or more compounds, the total numbers of carbon atoms in the molecules are 12-18 and 12-36 correspondingly, and the solidifying point of the extraction system is smaller than 0 DEG C; and single-stage or multi-stage counter-current extraction is conducted with the volume ratio of an organic phase to a brine phase being (1 to 10):1, the density of the brine being 1.25-1.38 g/cm3 and the temperature being 0-50 DEG C, a water phase with the low magnesium-to-lithium ratio is obtained through reextraction, and through concentration, impurity removal and preparation, lithium chloride, lithium carbonate and lithium hydroxideare obtained. The extraction system and method and application of the extraction method have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy toproduce, and the properties such as viscosity of the composite solvent are improved through trialkyl phosphate; the multi-stage extraction rate of Li<+> is high, the lithium and magnesium separationcoefficient is large, reextraction is conducted with water, and thus acid and alkali consumption is reduced greatly; and the extraction and separation processes are shortened, the dissolving loss of the extraction system is small, and industrial application value is achieved.

Description

technical field [0001] The invention relates to a method for extracting lithium from magnesium-containing brine, in particular to an extraction system, an extraction method and an application thereof for separating magnesium from magnesium-containing brine using a composite solvent to extract lithium. Background technique [0002] Since this century, the application of lithium in the field of new energy has reached an unprecedented and shocking level in both depth and breadth. Thousands of batteries have been used as power sources for electric vehicles, and tens of thousands of The use of lithium materials in 3C products is also increasingly widespread and popular, and the demand for lithium is increasing day by day. Lithium, as the key positive and negative electrode materials and electrolyte raw materials in batteries, is very important to obtain from natural resources. According to the statistics of the 2019 American Mineral Products Yearbook, Australia, Chile, China and ...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/40C01D15/02C01D15/04C01D15/08C25B1/34C22B26/22
CPCC01D15/02C01D15/04C01D15/08C22B26/12C22B26/22C25B1/34C22B3/409Y02P10/20
Inventor 杨立新李聪刘长周钦耀李海博
Owner XIANGTAN UNIV
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