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Flowing type electrochemical lithium extracting system

An electrochemical and flow technology, applied in the field of lithium recovery, to achieve the effects of excellent selectivity, rapid migration and convenient operation

Inactive Publication Date: 2019-03-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects of the existing industrialized lithium extraction methods and provide a flow electrochemical lithium extraction system with low cost and low energy consumption

Method used

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  • Flowing type electrochemical lithium extracting system
  • Flowing type electrochemical lithium extracting system
  • Flowing type electrochemical lithium extracting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of PANI electrode:

[0038] After fully mixing PANI powder, conductive agent acetylene black and binder PTFE according to the mass ratio of 70:20:10, add an appropriate amount of isopropanol to make it into a slurry, and use a roller molding machine to press it into a film with a thickness of about 0.2mm. The unit compression amount is 25~35mg / cm 2 , put it at 60°C for more than 12h to dry, take a 3×3cm film and press it on the stainless steel current collector to make a PANI electrode.

[0039] (2)λ-MnO 2 Electrode preparation:

[0040] λ-MnO 2 After the powder is fully mixed with the conductive agent acetylene black and the binder PTFE according to the mass ratio of 80:10:10, add an appropriate amount of isopropanol to make it into a slurry, and use a roller molding machine to press it into a film with a thickness of about 0.2mm, and the unit is pressed The amount is 15~25mg / cm 2 , put it at 60°C for more than 12h to dry, take a 3×3cm film and pre...

Embodiment 2

[0048] (1) Preparation of PANI electrode:

[0049] After fully mixing PANI powder, conductive agent acetylene black, and binder PTFE at a mass ratio of 80:10:10, add an appropriate amount of isopropanol to make it into a slurry, and use a roller molding machine to press it into a film with a thickness of about 0.2mm. The unit compression amount is 25~35mg / cm 2 , placed at 80°C for more than 12 hours to dry, take a 2×2cm film and press it on the titanium mesh collector to make a PANI electrode.

[0050] (2)λ-MnO 2 Electrode preparation:

[0051] λ-MnO 2 After the powder is fully mixed with the conductive agent acetylene black and the binder PTFE according to the mass ratio of 90:0.5:0.5, add an appropriate amount of isopropanol to make it into a slurry, and use a roller molding machine to press it into a film with a thickness of about 0.15mm, and the unit is pressed The amount is 15~25mg / cm 2 , put it at 80°C for more than 12h to dry, take a 2×2cm film and press it on the ...

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Abstract

The invention discloses a flowing type electrochemical lithium extracting system. According to the method, polyaniline (PANI) is adopted as a lithium extracting battery system negative electrode, a high Li<+> selective lambda-MnO2 material serves as a battery positive electrode, and extraction of lithium is achieved through a two-step flowing system. Firstly, a lithium-containing solution flows through the system, in the discharging process, negative ions are embedded into the PANI, and Li<+> is captured by the high Li<+> selective lambda-MnO2 electrode. After discharging is completed, recycling liquid is added for charging, the negative ions break away from the negative electrode PANI, and the Li+ is released from the positive electrode. Repeated circulation is performed many times, and the purpose that the lithium ions in the lithium-containing solution are separated from other positive ions and the lithium ions are enriched in the recycling liquid can be achieved. The system is an efficient, low-consumption, high-selectivity, simple-process, easy-to-control and pollution-free electrochemical lithium extracting method.

Description

technical field [0001] The invention relates to a method for separating and enriching lithium ions from a lithium-containing solution, specifically recovering lithium from the lithium-containing solution according to an electrochemical method. Background technique [0002] Lithium is the lightest and most active metal element in the world. In nature, lithium is mainly stored in ore and liquid deposits, of which the two representative ones are granite pegmatite and salt lake brine lithium deposits, accounting for 21.6% and 78.3% of the resources respectively. Among them, the ore raw materials for producing lithium mainly include spodumene, lepidolite and lithium petalite; liquid lithium resources mainly exist in salt lake brine, seawater, geothermal water and well brine, mostly carbonate, sulfate and in the form of chloride. Lithium metal and its compounds are widely used in the fields of glass, ceramics, metallurgy, lubricants and electrode materials. In recent years, wit...

Claims

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Application Information

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IPC IPC(8): C25C1/02C25C7/02
CPCC25C1/02C25C7/02
Inventor 曹余良赵阿龙艾新平杨汉西
Owner WUHAN UNIV
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