Extraction system and extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide/alkyl ketone complex solvent and application of extraction method

A composite solvent and secondary amide technology are applied in the field of extraction systems for separating magnesium from magnesium-containing brines and extracting lithium from composite solvents, which can solve problems such as failure to complete the large-scale test verification and screening of extractants, and failure to find extraction systems, and achieve Reduce acid-base consumption, simple structure, and achieve the effect of two-way balance

Active Publication Date: 2020-01-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 verification and screening of the extractant, and the most suitable extraction system has not been found so far.

Method used

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  • Extraction system and extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide/alkyl ketone complex solvent and application of extraction method
  • Extraction system and extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide/alkyl ketone complex solvent and application of extraction method
  • Extraction system and extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide/alkyl ketone complex solvent and application of extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Li in brine of a salt lake in Qaidam Basin, Qinghai + and Mg 2+ The contents are 2.01g / L and 113.43g / L respectively, the mass ratio of magnesium to lithium is 56.43:1, 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. Take 6mL of this brine into a 100mL ground conical flask, and then add 27mL of N-isooctylbutanamide extractant and 3mL of diisobutyl ketone co-extractant, the co-extractant accounts for 10% of the organic phase volume, and the organic The volume ratio of phase to salt lake brine is 5:1. 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 100mL plastic test tube, an...

Embodiment 2

[0058] Take 27mL N-isoamyl octanamide extractant and 3mL 2,6,8-trimethyl-4-nonanone co-extractant in a 100mL ground conical flask, the co-extractant accounts for 10% of the organic phase volume, Then, 10 mL of the salt lake brine in Example 1 was added therein, and the volume ratio of the organic phase to the salt lake brine was 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 4000r / min for 10min in an LD5-10 desktop centrifuge. The two-phase interface was clear. + , Mg 2+ organic phase. Transfer the loaded organic phase to another 100mL ground-mouth conical flask, add deionized water in a volume ratio of 1:3 to the organic phase, and place it in a DF-101S collector t...

Embodiment 3

[0064] Take 24mL of N-amylisononamide extractant and 6mL of dipentyl ketone co-extractant in a 100mL ground conical flask, the co-extractant accounts for 20% of the organic phase volume, and then add 3mL of Example 1 to it. The volume ratio of organic phase to salt lake brine is 10:1. 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 type constant temperature heating magnetic stirrer, mix and stir at 0 ℃ and extract for 20min. Then the mixed liquid was transferred to a 100mL plastic test tube, and centrifuged at 4000r / min for 8min in an LD5-10 desktop centrifuge. The two-phase interface was clear. + , Mg 2+ organic phase. Transfer the loaded organic phase to another 100mL ground-mouth conical flask, add deionized water in a volume ratio of 1:10 to the organic phase, and place it in a DF-101S collector type constant temperature heating magnetic stir...

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Abstract

The invention discloses an extraction system and an extraction method for separating magnesium and extracting lithium from magnesium-containing brine with a secondary amide/alkyl ketone complex solvent and application of the extraction method. The extraction system contains secondary amide and alkyl ketone each of which consists of a single compound or more than two mixtures; the total number of carbon atoms in a molecule of the secondary amide and the total number of carbon atoms in a molecule of the alkyl ketone are 12-18 and 8-12 respectively; and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multistage counter-current extraction and back extraction are performed under the conditions that the volume ratio of an organic phase to a brine phase is (1-10) : 1, the density of the brine is 1.25-1.38 g/cm<3> and the temperature is 0-50 DEG C to obtain an aqueous phase low in magnesium and lithium ratio, and concentration, impurity removal and preparation are performed to obtain a lithium chloride product, a lithium carbonate product and a lithium hydrate product. The extraction system and the extraction method have the excellent effects a secondary amide extraction agent is simple in molecular structure and easy to produce, and the alkyl ketone improves physical properties, such as the viscosity of the complex solvent, and the like; the multistage extraction rate of Li<+> is high; the magnesium and lithium separation coefficient is big; back extraction is performed with water, so that acid and alkali consumption is greatly reduced; the extraction and separation process flow is short; the extraction system has small solvent loss; and the extraction system and the extraction method have high industrial application value.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/40C22B26/12C25B1/34C01B7/01C01D15/08C01D15/04
CPCC22B7/006C22B26/12C25B1/34C01B7/012C01D15/08C01D15/04C22B3/402Y02P10/20
Inventor 杨立新刘长张阳阳李聪周钦耀李海博
Owner XIANGTAN UNIV
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