Extraction system and extraction method for extracting lithium from magnesium-containing brine by using secondary amide/alkyl ester complex solvent, and application thereof

A composite solvent and secondary amide technology, which is applied in the field of extraction systems for composite solvents to separate magnesium from magnesium-containing brines to extract lithium, can solve the problems of undiscovered extraction systems, uncompleted extraction agent scale test verification and screening, etc., to achieve The effect of reducing acid and alkali consumption, simple structure, and increasing mixing entropy

Active Publication Date: 2020-01-03
XIANGTAN UNIV
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  • 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 extracting lithium from magnesium-containing brine by using secondary amide/alkyl ester complex solvent, and application thereof
  • Extraction system and extraction method for extracting lithium from magnesium-containing brine by using secondary amide/alkyl ester complex solvent, and application thereof
  • Extraction system and extraction method for extracting lithium from magnesium-containing brine by using secondary amide/alkyl ester complex solvent, and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Li in the brine of a salt lake in Qaidam Basin, Qinghai + and Mg 2+ The contents are 2.01g / L and 113.43g / L respectively, and 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 brine pH value is 4.3. Get 10mL of this kind of bittern in the 100mL ground mouth Erlenmeyer flask, then add 21mL N-isooctylbutanamide extractant and 9mL methyl laurate co-extractant therein, co-extractant accounts for 30% of organic phase volume, organic Phase to salt lake brine volume ratio is 3:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from splashing out, place it in a DF-101S collector type constant temperature heating magnetic stirrer, mix and stir at 20°C, and extract for 20 minutes. Then the mixed liquid was transferred to a 250mL plastic test tube, ce...

Embodiment 2

[0058] Get 27mL N-butyl nonanamide extraction agent and 3mL ethyl nonanoate co-extractant in 100mL ground mouth Erlenmeyer flask, co-extractant occupies 10% of organic phase volume, then adds the salt lake brine in 6mL embodiment 1 wherein, The volume ratio of organic phase to salt lake brine is 5:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from splashing out, place it in a DF-101S collector type constant temperature heating magnetic stirrer, mix and stir at 20°C, and extract for 20 minutes. Then the mixed liquid was transferred to a 250mL plastic test tube, and centrifuged at a speed of 4300r / min in an LD5-10 desktop centrifuge for 8min. The interface between the two phases was clear. After phase separation, the extracted brine sample and loaded Li + , Mg 2+ the organic phase. Transfer the loaded organic phase to another 100mL ground-mouth Erlenmeyer flask, add deionized water at a volume ratio ...

Embodiment 3

[0064] Get 24mL N-isopentyl octanamide extraction agent and 6mL isopropyl myristate co-extractant in the 100mL ground mouth Erlenmeyer flask, co-extractant occupies 20% of organic phase volume, then adds 6mL embodiment 1 therein The salt lake brine in the medium, the volume ratio of the organic phase to the salt lake brine is 5:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from splashing out, place it in a DF-101S collector type constant temperature heating magnetic stirrer, mix and stir at 0°C, and extract for 20 minutes. Then the mixed liquid was transferred to a 100mL plastic test tube, centrifuged at 4000r / min in an LD5-10 desktop centrifuge for 8min, the interface between the two phases was clear, and the extracted brine sample and loaded Li + , Mg 2+ the organic phase. Transfer the loaded organic phase to another 100mL ground-mouth Erlenmeyer flask, add deionized water at a volume ratio of 1:...

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Abstract

The invention discloses an extraction system and an extraction method for extracting lithium from magnesium-containing brine by using a secondary amide/alkyl ester complex solvent, and application thereof. The extraction system contains secondary amide and alkyl ester which are respectively prepared from a single compound or a mixture of more than two compounds; in the molecules, the totals of carbon atoms are respectively 12 to 18 and 8 to 20; and the freezing point of the extraction system is smaller than 0 DEG C. The extraction method comprises the steps of carrying out single-stage or multi-stage counter-current extraction under the conditions that the volume ratio of an organic phase and a brine phase is 1 to 10:1, the brine density is 1.25 to 1.38g/cm<3> and the temperature is 0 to 50 DEG C, carrying out back-extraction to obtain a low-magnesium-lithium-ratio water phase, and obtaining lithium chloride, lithium carbonate and lithium hydroxide products through concentration, purification and preparation. The extraction system and the extraction method for extracting the lithium from the magnesium-containing brine by using the secondary amide/alkyl ester complex solvent, and the application thereof provided by the invention have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, the physical properties such asviscosity of the complex solvent is improved through alkyl ester, the Li+ multistage extraction rate is high, the lithium-magnesium separation coefficient is large, and the acid-alkali consumption isgreatly reduced due to back-extraction by water; and the extraction separation process flow is short, and the extraction system is low in solution loss and has a favorable 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, extraction method and application thereof for separating magnesium from magnesium-containing brine and extracting lithium with a composite solvent. Background technique [0002] Since this century, the application of lithium in the field of new energy has reached an unprecedented and shocking level in terms of depth and breadth. People have turned thousands of batteries into power sources for electric vehicles, and tens of thousands The combined structure of the metered battery as an energy storage device, the use of lithium materials in 3C products is becoming more and more 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 sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B26/22C22B3/32C25B1/34C01D15/08C01D15/02C01D15/04
CPCC01D15/02C01D15/04C01D15/08C22B26/12C22B26/22C25B1/34C22B3/32C22B3/324C22B3/326Y02P10/20
Inventor 杨立新刘长李聪周钦耀李海博李娜
Owner XIANGTAN UNIV
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