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Application of metal ion complexing agent in waste and old lithium iron phosphate battery recovery process

A technology of lithium iron phosphate battery and waste lithium battery, which is applied in the direction of waste collector recycling, lithium carbonate;/acid carbonate, etc., can solve the problems of low purity, limited reuse, etc., and achieves simple process operation, The effect of cost controllable and wide source of raw materials

Inactive Publication Date: 2018-08-14
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the method of recycling the positive electrode of lithium iron phosphate battery, although the different elements in the lithium iron phosphate battery can be separated and recovered to a certain extent, the obtained Li 2 CO 3 Low purity, often mixed with Li 3 PO 4 , thus limiting its reuse

Method used

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  • Application of metal ion complexing agent in waste and old lithium iron phosphate battery recovery process
  • Application of metal ion complexing agent in waste and old lithium iron phosphate battery recovery process
  • Application of metal ion complexing agent in waste and old lithium iron phosphate battery recovery process

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Embodiment 1

[0041] This embodiment provides a method for recycling waste lithium iron phosphate batteries, comprising the following steps:

[0042] S101: LiFePO will be scrapped 4 After the battery is discharged, mechanically disassembled and stripped, ultrasonically dispersed, and sieved, the black powder mixed with graphite powder and lithium iron phosphate is obtained.

[0043] S102: Dissolve 50 g of the above black powder in 125 mL of 2mol / L hydrochloric acid and 15 mL of 30% H 2 o 2 In the compound solution, heat and stir at 80°C for 2h, cool and stand still, and filter to obtain the filtrate containing Li and Fe and graphite powder.

[0044] S103: Add 50mL of 1000ppm Fe(NO 3 ) 3 Solution, and by adding NaOH solution to adjust the pH value of the system to 4, to obtain phosphate precipitate and filtrate.

[0045] S104: Add lye to the filtrate obtained in S103 to adjust the pH value to 10, and then remove the residual metal ion complexing agent to obtain a Li-containing + enrich...

Embodiment 2

[0049] This embodiment provides a method for recycling waste lithium iron phosphate batteries, comprising the following steps:

[0050] S101: LiFePO will be scrapped 4 After the battery is discharged, mechanically disassembled and stripped, ultrasonically dispersed, and sieved, the black powder mixed with graphite powder and lithium iron phosphate is obtained.

[0051] S102: Dissolve 100g of the above black powder in 250mL of 2mol / L HNO 3 solution with 30mL of 30% H 2 o 2 In the compound solution, heat and stir at 75°C for 3h, cool and stand still, and filter to obtain the filtrate containing Li and Fe and graphite powder.

[0052] S103: Add 80mL of 1000ppm Fe to the filtrate containing Li and Fe 2 (SO 4 ) 3 Solution, and by adding NaOH solution to adjust the pH value of the system to 3, to obtain phosphate precipitate and filtrate.

[0053] S104: Add lye to the filtrate obtained in S103 to adjust the pH value to 12, and then remove the residual metal ion complexing age...

Embodiment 3

[0058] This embodiment provides a method for recycling waste lithium iron phosphate batteries, comprising the following steps:

[0059] S101: LiFePO will be scrapped 4 After the battery is discharged, mechanically disassembled and stripped, ultrasonically dispersed, and sieved, the black powder mixed with graphite powder and lithium iron phosphate is obtained.

[0060] S102: Dissolve 100g of the above black powder in 250mL of 2mol / L H 2 SO 4 solution with 30mL of 30% H 2 o 2 In the compound solution, heat and stir at 80°C for 5h, cool and stand still, and filter to obtain the filtrate containing Li and Fe and graphite powder.

[0061] S103: Add 100mL of 1000ppm Fe(NO 3 ) 3 Solution, and by adding NaOH solution to adjust the pH value of the system to 2, to obtain phosphate precipitate and filtrate.

[0062] S104: Add lye to the filtrate obtained in S103 to adjust the pH value to 9, and then remove the residual metal ion complexing agent to obtain a Li-containing + enric...

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Abstract

The invention relates to an application of a metal ion complexing agent in a waste and old lithium iron phosphate battery recovery process. The metal ion complexing agent is used for the waste and oldbattery recovery process to eliminate the interference effect of PO43-, and high-purity lithium carbonate is finally obtained; concretely, the waste and old battery is pre-processed to obtain black powder, then the black powder is dissolved in a complex formulation solution of dilute acid and an oxidizing agent, and the materials are heated and stirred and filtered to obtain a Fe and Li-containing filtrate; the metal ion complexing agent is added, and a pH value is added to obtain an enrichment solution containing Li+; the enrichment solution is heated and concentrated, CO32- is introduced, and Li2CO3 precipitate is obtained. A recovery target is a precious lithium resource in a lot of the waste lithium iron phosphate batteries on market, the raw material source is wide, and the purity ofLi2CO3 is obviously increased; in addition, the process is simple, the recovery rate is high, the cost is controllable, the process is easy for industrial popularization and application, the nationalprecious lithium resource can be saved, and the circular economy is developed.

Description

technical field [0001] The invention relates to the technical field of recycling and utilization of lithium resources, in particular to the application of a metal ion complexing agent in the recycling process of waste lithium iron phosphate batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, due to their advantages such as high voltage, high energy density, long cycle life, good safety and no memory effect, they have gradually replaced other types of secondary batteries and are widely used in Mobile communications, notebook computers, portable tools, electric bicycles and other fields. [0003] At present, about 5 billion lithium batteries are produced in the world every year. Most lithium batteries will be scrapped after about 1000 charge and discharge cycles. A huge waste of metal resources has been caused. In addition, although my country's lithium resources are relatively rich, accounting for 23% of the world's to...

Claims

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Application Information

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IPC IPC(8): C01D15/08H01M10/54
Inventor 吴红军李志达苑丹丹纪德强王宝辉隋欣
Owner NORTHEAST GASOLINEEUM UNIV
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