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Method for extracting lithium salt from high magnesium-lithium ratio saline water in electrochemical way

A technology of high magnesium-to-lithium ratio and lithium extraction, applied in the direction of alkali metal chloride, etc., can solve the problems of high water consumption, pollution, equipment corrosion environment, etc., and achieve the effects of overcoming high water consumption, low cost, and non-toxic reagents

Active Publication Date: 2016-05-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for electrochemically extracting lithium salts from high-magnesium-lithium ratio brine to solve equipment corrosion and environmental pollution caused by large water consumption and hydrochloric acid elution in the process of using lithium ion sieve ion exchange method to extract lithium salts And other issues

Method used

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  • Method for extracting lithium salt from high magnesium-lithium ratio saline water in electrochemical way
  • Method for extracting lithium salt from high magnesium-lithium ratio saline water in electrochemical way
  • Method for extracting lithium salt from high magnesium-lithium ratio saline water in electrochemical way

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Effect test

Embodiment 1

[0027] (1) Weigh 200mg spinel LiMn respectively 2 o 4 , 25mg acetylene black conductive agent and 25mg polyvinylidene fluoride PVDF binder, weigh 808.3mg N-methylpyrrolidone NMP, dissolve polyvinylidene fluoride PVDF binder in N-methylpyrrolidone NMP, and then add the weighed Amount of spinel LiMn 2 o 4 and acetylene black conductive agent, fully stirred to form a slurry, and the slurry was evenly coated on the titanium mesh collector fluid, and the loading capacity of solid matter was 10mg / cm 2 , and then vacuum dried at 80 °C for 8 hours to obtain LiMn 2 o 4 electrode;

[0028] (2) The titanium mesh was used as the working electrode and the counter electrode, the Ag / AgCl electrode was used as the reference electrode, and the LiCl solution with a concentration of 0.01mol / L was used as the electrolyte solution to form an electrochemical reaction system; 1V (vs .Ag / AgCl) voltage charging for 10min, chlorine ions are adsorbed on the surface of the titanium mesh working ele...

Embodiment 2

[0035] (1) Weigh 200mg spinel LiMn respectively 2 o 4 , 80mg acetylene black conductive agent and 120mg polyvinylidene fluoride PVDF binder, weigh 5.88g N-methylpyrrolidone NMP, dissolve polyvinylidene fluoride PVDF binder in NMP in N-methylpyrrolidone, and then add the weighed Amount of spinel LiMn 2 o 4 and acetylene black conductive agent, fully stirred to form a slurry, and the slurry was evenly coated on the titanium net collector fluid, and the loading capacity of solid matter was 5mg / cm 2 , and then dried under vacuum at 50 °C for 5 hours to obtain LiMn 2 o 4 electrode;

[0036] (2) The titanium mesh is used as the working electrode and the counter electrode, the Ag / AgCl electrode is used as the reference electrode, and the LiCl solution with a concentration of 0.005mol / L is used as the electrolyte solution to form an electrochemical reaction system; apply 0.9V ( vs.Ag / AgCl) voltage charging for 5min, chlorine ions are adsorbed on the surface of the titanium mesh ...

Embodiment 3

[0042] (1) Weigh 200mg spinel LiMn respectively 2 o 4 , 11.8mg acetylene black conductive agent and 23.6mg polyvinylidene fluoride PVDF binder, weigh 448.4mg N-methylpyrrolidone NMP, dissolve polyvinylidene fluoride PVDF binder in N-methylpyrrolidone NMP, and then add Weighed spinel LiMn 2 o 4 and acetylene black conductive agent, fully stirred to form a slurry, and the slurry was evenly coated on the titanium mesh collector fluid, and the loading capacity of solid matter was 15mg / cm 2 , and then vacuum dried at 100 °C for 10 h to obtain LiMn 2 o 4 electrode;

[0043] (2) The titanium mesh is used as the working electrode and the counter electrode, the Ag / AgCl electrode is used as the reference electrode, and the LiCl solution with a concentration of 0.05mol / L is used as the electrolyte solution to form an electrochemical reaction system; apply 0.95V to the titanium mesh working electrode ( vs.Ag / AgCl) voltage charging for 20min, chlorine ions are adsorbed on the surface...

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Abstract

The invention relates to a method for extracting lithium salt from high magnesium-lithium ratio saline water in an electrochemical way, belonging to the technical field of lithium salt chemical industry. The method comprises the steps of enabling a titanium mesh current collector to be evenly coated with spinel type LiMn2O4 so as to be taken as a working electrode, and taking a titanium mesh as a counter electrode to form an electrochemical lithium extraction system; in an LiCl solution, enabling the LiMn2O4 working electrode and the titanium mesh counter electrode to be respectively connected with a positive pole and a negative pole of a power supply for charging, enabling lithium ions to be separated out from LiMn2O4 to form a lithium ion sieve; enabling the electrode system to discharge in the high magnesium-lithium ratio saline water to enable the lithium ions to be selectively embedded into the lithium ion sieve, and carrying out charge and discharge cyclic operation to realize electrochemical extraction of lithium salt. The method has the advantages that the lithium salt is efficiently and rapidly extracted; furthermore, the problem that the solution loss of the lithium ion sieve, the corrosion of equipment and environmental pollution which are caused by strong acids such as hydrochloric acid and the like can be avoided. In the lithium salt extraction process, the method relates to the conversion of electric energy and chemical energy, thus being used as an electrochemical energy storage device at the same time.

Description

technical field [0001] The invention belongs to the technical field of lithium salt chemical industry, and in particular relates to a method for electrochemically extracting lithium salt from brine with high magnesium-lithium ratio, which is suitable for electrochemically extracting lithium salt from brine with high magnesium-lithium ratio such as salt lakes and oceans. Background technique [0002] Lithium is the lightest metal element with unique physical and chemical properties. It is the only element in the periodic table called "energy metal". It is a strategic resource of great significance in national economy and national defense construction. The development and utilization of lithium resources has a new climax in the new century, especially with the increasingly prominent resource and environmental issues, lithium battery energy has become the focus of global research and development, and has attracted people's attention. [0003] The total amount of terrestrial lit...

Claims

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Application Information

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IPC IPC(8): C01D3/06
CPCC01D3/06
Inventor 杨文胜于永利王淼刘长霞彭正康董辰龙
Owner BEIJING UNIV OF CHEM TECH
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