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A method for removing aluminum and recycling waste lithium iron phosphate batteries

A ferrous phosphate and waste technology, which is applied in the field of removing aluminum impurities, can solve the problems that affect the electrochemical performance of lithium iron phosphate positive electrode active materials, do not consider defluorination, purification and removal of copper, aluminum impurities, etc., to facilitate automatic production , Improve the effect of fluoride removal, good effect of impurity removal

Active Publication Date: 2020-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101916889B discloses a method for preparing lithium iron phosphate by recycling lithium-ion power batteries. The method uses inorganic acid to leach Li + , Fe 2+ and PO 4 3- , then add lithium source or iron source and ascorbic acid, control the pH value to obtain precipitation, and finally ball mill, dry and calcine in sucrose aqueous solution to obtain lithium iron phosphate. Although this method adopts coprecipitation method to prepare lithium iron phosphate, it does not consider defluorination, Purify and remove copper and aluminum impurities, LiF salt and copper and aluminum elements will enter into the synthesized crude product of lithium iron phosphate through co-precipitation, and ultimately affect the electrochemical performance of lithium iron phosphate positive electrode active material

Method used

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  • A method for removing aluminum and recycling waste lithium iron phosphate batteries
  • A method for removing aluminum and recycling waste lithium iron phosphate batteries
  • A method for removing aluminum and recycling waste lithium iron phosphate batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Measure 300 mL of the solution leached by sulfuric acid, add 8 g of reducing iron powder and 4 g of urea in sequence, and stir in a 60°C constant temperature water bath with a nitrogen atmosphere. When the pH rises to 3.0, filter the off-white filter residue and the filtrate after cleaning. The content of aluminum ion in the solution was 18mg / L through ICP detection, and the composition of the filter residue was tested by XRF as shown in Table 2.

[0094] Table 2

[0095]

Embodiment 2

[0102] Measure 600mL of the solution leached in sulfuric acid, add 10g of reducing iron powder and 8g of ammonium dihydrogen phosphate in sequence, and stir in a constant temperature water bath at 80°C under a nitrogen atmosphere. When the pH rises to 3.0, filter to obtain the off-white filter residue and the cleaned filtrate. The content of aluminum ion in the solution was 5mg / L through ICP detection, and the composition of the filter residue was tested by XRF as shown in Table 4.

[0103] Table 4

[0104]

[0105]

Embodiment 3

[0107] Compared with Example 2, the difference is that it is not carried out in a protective atmosphere, and the specific operations are as follows:

[0108] Measure 600 mL of the solution leached by sulfuric acid, add 10 g of reducing iron powder and 8 g of ammonium dihydrogen phosphate in sequence, stir in a constant temperature water bath at 80°C, when the pH rises to 3.0, filter to obtain a gray filter residue and a filtrate after cleaning. The content of aluminum ion in the solution was 134 mg / L through ICP detection, and the composition of the filter residue was tested by XRF as shown in Table 5.

[0109] table 5

[0110]

[0111] Compared with Example 2, it is not carried out in a preferred protective atmosphere, and the aluminum removal effect is reduced.

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Abstract

The invention discloses a method for removing aluminum impurities in an iron-containing mixed solution of sulfuric acid and phosphoric acid. The method comprises the following steps that (1) a certainamount of reducing agent and neutralizing agent are added into the mixed solution; (2) non-oxidizing gas is fed into the solution at a certain temperature, and thermostatic water-bath stirring is conducted; and (3) filtering is conducted after stirring is conducted for a period of time, and obtained filtrate is the impurity-removing solution. The method has the advantages that the process is simple, the flow path is short, the aluminum impurity removing effect is good, no impurity is introduced, and the method is suitable for large-batch production.

Description

Technical field [0001] The invention relates to a method for removing aluminum impurities from an iron-containing sulfuric acid and phosphoric acid mixed solution. Background technique [0002] Lithium Iron Phosphate (LiFePO 4 ) As a new type of cathode material for lithium-ion batteries, due to its rich iron resources, low price, good cycle performance, and high safety performance, it is widely used in the electric vehicle industry under my country’s policy support and guidance. However, with the rapid growth of the electric vehicle industry, the China Automotive Technology Research Center predicts that by 2020, the cumulative amount of electric vehicle power batteries in my country will reach 322,000 tons (most of them are lithium iron phosphate power batteries). At present, the recycling of waste lithium iron phosphate power batteries is mainly based on the wet process. The pretreated waste lithium iron phosphate active materials are dissolved by the acid leaching method, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12H01M4/58H01M10/54
CPCC22B7/006C22B26/12H01M4/5825H01M10/54Y02E60/10Y02P10/20Y02W30/84
Inventor 杨声海介亚菲赖延清陈永明何静唐朝波
Owner CENT SOUTH UNIV
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