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Method for recycling lithium from lithium iron phosphate, and lithium-rich solution

A technology of lithium iron phosphate and lithium recovery, applied in the field of lithium recovery, can solve the problems of large amount of wastewater treatment, large amount of acid, etc., and achieve the effect of convenient reuse

Inactive Publication Date: 2018-01-05
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses acid leaching, which will leach a large amount of iron elements, and has the problems of large amount of acid and large amount of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The method for reclaiming lithium from lithium iron phosphate of the present embodiment comprises the steps:

[0035] 1) Dissolve 45g of sodium persulfate in 500g of water, and mix well to obtain a sodium persulfate solution; add 40g of lithium iron phosphate powder to it, control the temperature at 60°C for reaction, keep stirring during the reaction, stop the reaction after 4h, and filter , washing, the washing liquid is merged into the filtrate to obtain a colorless transparent solution; the solution is heated and concentrated until the lithium content therein is about 1% to obtain a lithium-rich solution;

[0036] 2) Adjust the above lithium-rich solution to pH = 8 with NaOH solution, filter to remove impurities, then heat the filtrate to 95°C, add dropwise 30% sodium carbonate solution which is 1.2 times the theoretical stoichiometric ratio, and react for 20 minutes to stop adding sodium carbonate Solution, filtered to obtain lithium carbonate.

[0037] The lithiu...

Embodiment 2

[0039] The method for reclaiming lithium from lithium iron phosphate of the present embodiment comprises the steps:

[0040] 1) Dissolve 95g of sodium persulfate in 500g of water, and mix well to obtain a sodium persulfate solution; add 50g of lithium iron phosphate powder to it, control the temperature at 90°C for reaction, keep stirring during the reaction, stop the reaction after 5h, and filter , washing, the washing liquid is merged into the filtrate to obtain a colorless transparent solution; the solution is heated and concentrated until the lithium content therein is about 1% to obtain a lithium-rich solution;

[0041] 2) Adjust the above lithium-rich solution to pH = 8 with NaOH solution, filter to remove impurities, then heat the filtrate to 95°C, add dropwise 30% sodium carbonate solution which is 1.2 times the theoretical stoichiometric ratio, and react for 20 minutes to stop adding sodium carbonate Solution, filtered to obtain lithium carbonate.

[0042] The lithiu...

Embodiment 3

[0044] The method for reclaiming lithium from lithium iron phosphate of the present embodiment comprises the steps:

[0045] 1) Dissolve 50g of sodium persulfate in 500g of water and mix evenly to obtain a sodium persulfate solution; add 40g of lithium iron phosphate powder to it, control the temperature at 40°C for reaction, keep stirring during the reaction, stop the reaction after 1h, and filter , washing, the washing liquid is merged into the filtrate to obtain a colorless transparent solution; the solution is heated and concentrated until the lithium content therein is about 1% to obtain a lithium-rich solution;

[0046] 2) Adjust the above lithium-rich solution to pH = 8 with NaOH solution, filter to remove impurities, then heat the filtrate to 95°C, add dropwise 30% sodium carbonate solution which is 1.2 times the theoretical stoichiometric ratio, and react for 20 minutes to stop adding sodium carbonate Solution, filtered to obtain lithium carbonate.

[0047] The lithi...

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PUM

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Abstract

The invention relates to a method for recycling lithium from lithium iron phosphate, and a lithium-rich solution, and belongs to the technical field of material recycling of a lithium ion battery. Themethod for recycling lithium from lithium iron phosphate comprises the following steps of enabling lithium iron phosphate powder and a sodium persulfate solution to be reacted at a temperature of 25-99 DEG C for 1h or above, and performing solid liquid separation to obtain a liquid which is the lithium-rich solution. The method for recycling lithium from lithium iron phosphate has the unique characteristics of performing lithium extraction firstly, no solution of the main body material, low impurity removing amount, high lithium element separation efficiency and the like; and the lithium element separation efficiency can reach 99.9%.

Description

technical field [0001] The invention relates to a method for recovering lithium from lithium iron phosphate and a lithium-rich solution, belonging to the technical field of lithium ion battery material recovery. Background technique [0002] With the continuous advancement of China's new energy strategy, the lithium-ion battery industry has achieved unprecedented development. Due to the excellent electrochemical performance and high safety of lithium iron phosphate, lithium iron phosphate batteries have been vigorously promoted. Under normal circumstances, the decommissioning period of lithium-ion batteries is about 3 years. At present, large-scale lithium iron phosphate batteries have begun to be decommissioned. From the perspective of environmental protection and resource reuse, the recovery of lithium elements in waste lithium iron phosphate is inevitable. lack. [0003] At present, the recovery of waste lithium-ion batteries is still in the research stage, and the reco...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 朱建楠李肖肖王楠齐彬伟李兴旺
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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