Extraction system and method for separating magnesium and extracting lithium from magnesium containing brine with secondary amide/tertiary amide 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 The effect of reducing acid and alkali consumption, simple structure and easy source

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

Examples

Experimental program
Comparison scheme
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. Take 6mL of this kind of brine in a 100mL ground-mouth Erlenmeyer flask, and then add 24mL of N-isooctylbutanamide extractant and 6mL of N,N-di-second-octylacetamide co-extractant to it, and the co-extractant occupies the organic phase 20% by volume, 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...

Embodiment 2

[0057] Take 21mL of N-butylnonanamide extractant and 9mL of N,N-dipentyl octanamide co-extractant in a 100mL ground-necked Erlenmeyer flask, the co-extractant occupies 30% of the volume of the organic phase, and then add 10mL of Example 1 For the salt lake brine in the medium, the volume ratio of the organic phase to the salt lake brine 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 0°C, and extract for 20 minutes. Then the mixed liquid was transferred to a 250mL plastic test tube, centrifuged at 5000r / min for 12min in a LD5-10 desktop centrifuge, the interface between the two phases was clear, and 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 d...

Embodiment 3

[0063] Take 15mL of N-heptyl-3,3-dimethylbutanamide extractant and 15mL of N,N-di-second-octylacetamide co-extractant in a 100mL ground-necked conical flask, and the co-extractant occupies 1 / 2 of the volume of the organic phase. 50%, and then add 6mL of the salt lake brine in Example 1 therein, and 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 20°C, and extract for 20 minutes. Then the mixed liquid was transferred to a 250mL plastic test tube, centrifuged at 4500r / min for 12min in a LD5-10 desktop centrifuge, 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 de...

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Abstract

The invention discloses an extraction system and method for separating magnesium and extracting lithium from magnesium containing brine with a secondary amide/tertiary amide complex solvent and application of the extraction method. The extraction system contains secondary amide and tertiary amide, and each of the secondary amide and the tertiary amide is composed of a single compound or a mixtureof two or more compounds. The total number of carbon atoms in a molecule of the secondary amide ranges from 12 to 18, the total number of carbon atoms in a molecule of the tertiary amide ranges from 18 to 32, and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multi-stage counter-current extraction is carried out under the condition that the volume ratio of anorganic 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 ranges from 0 DEG C to 50 DEG C; and a water phase low in magnesium-lithium ratio is obtained through reextraction, and lithium chloride, lithium carbonate and lithium hydroxide products are obtained through concentration, purification and preparation. The extraction system and method for separating magnesium and extracting lithium from the magnesium containing brine with the secondary amide/tertiary amide composite solvent and the application of the extraction method have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, and the viscosity and other physical characters of the complex solvent are improved through the tertiary amide; the multi-stage extraction rate of Li+ is high, the magnesium-lithium separation coefficient is large, water is used for reextraction, and acid-base consumption is greatly reduced; and the extraction separation technological process is short, the extraction system is small in dissolution loss, and high 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, 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 杨立新刘长李聪李志强彭汝军李海博
Owner XIANGTAN UNIV
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