A method for recovering lithium and iron from electric vehicle lithium iron phosphate power battery

A power battery, lithium iron phosphate technology, applied in the direction of iron oxide/iron hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problem of containing a large amount of other metals, affecting quality, and lack of steps to remove metal impurities and other issues to achieve the effect of simple process

Active Publication Date: 2011-12-21
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lack of steps to remove metal impurities in the process of this method will cause the product to contain a large amount of other metals, which will affect the quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Disassemble the waste electric vehicle lithium iron phosphate power battery after discharge to obtain the positive electrode sheet of the battery. Then put it into a vertical high-speed rotary pulverizer for pulverization, and the pulverization time is 10 minutes. The pulverized material is sieved with an 80-mesh standard sieve, and the powder under the 50g sieve is put into a beaker;

[0037] 2) Put the beaker with the powder in a constant temperature water bath at 60°C, add 250ml of sodium hydroxide solution with a mass concentration of 25%, react for 1 hour under stirring, filter, rinse the filter sludge with distilled water several times, and put inside the beaker;

[0038] 3) Add 200ml of 4.0mol / L sulfuric acid and 30ml of 40% hydrogen peroxide, heat to 60°C for 1 hour, and then filter to obtain the leachate;

[0039] 4) Prepare 25% sodium hydroxide solution, slowly add sodium hydroxide solution dropwise to the leaching solution while stirring and monitor the ...

Embodiment 2

[0045] 1) Disassemble the waste electric vehicle lithium iron phosphate power battery after discharge to obtain the positive electrode sheet of the battery. Then put it into a vertical high-speed rotary pulverizer for pulverization, and the pulverization time is 15 minutes. The pulverized material is sieved with an 80-mesh standard sieve, and the powder under the 100g sieve is put into a beaker;

[0046] 2) Put the beaker with the powder in a constant temperature water bath at 50°C, add 300ml of sodium hydroxide solution with a mass concentration of 10%, react for 3 hours under stirring, filter, rinse the filter mud with distilled water several times, put into the beaker;

[0047] 3) Add 450ml of 3.0mol / L sulfuric acid and 50ml of 30% hydrogen peroxide, heat to 90°C for 2 hours, and filter to obtain the leachate;

[0048] 4) Add sodium hydroxide solution to adjust the pH value of the leachate to 2, precipitate ferric hydroxide, and filter to obtain the filtrate;

[0049] 5)...

Embodiment 3

[0054] 1) Disassemble the waste electric vehicle lithium iron phosphate power battery after discharge to obtain the positive electrode sheet of the battery. Then put it into a vertical high-speed rotary pulverizer for pulverization, and the pulverization time is 15 minutes. The pulverized material is sieved with an 80-mesh standard sieve, and the powder under the 200g sieve is put into a beaker;

[0055] 2) Put the beaker with the powder in a constant temperature water bath at 80°C, add 500ml of sodium hydroxide solution with a mass concentration of 30%, react for 3 hours under stirring, filter, rinse the filter sludge with distilled water several times, and put into the beaker;

[0056] 3) Add 600ml of 5.0mol / L sulfuric acid and 200ml of 50% hydrogen peroxide to the filter mud, heat to 80°C for leaching for 1.5 hours, and filter to obtain the leachate;

[0057]4) Add sodium hydroxide solution to adjust the pH value of the leachate to 3, precipitate ferric hydroxide, and fil...

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PUM

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Abstract

The invention discloses a method for recovering lithium and iron from a lithium iron phosphate power battery for an electromobile. The method comprises the following steps: 1) disassembling the lithium iron phosphate power battery so as to obtain a positive electrode material, smashing and screening so as to obtain a powder material; 2) adding an alkali solution in the powder material to dissolve aluminum and oxide of aluminum, and filtering so as to obtain filter mud; 3) lixiviating the filter mud with a mixed solution of an acid and a reducing agent so as to obtain lixivium; 4) adding an alkali to regulate the pH value of the lixivium to 1.5-3, precipitating to separate out iron hydroxide, and filtering so as to obtain filtrate; 5) firing iron hydroxide obtained in the step 4) so as to obtain iron oxide; 6) regulating the pH value of the lixivium to 5.0-8.0 with an alkali, precipitating impurities in the lixivium, and filtering so as to obtain filtrate; and 7) adding a solid sodium carbonate in the filtrate, and concentrating and crystallizing the obtained solution so as to obtain lithium carbonate. The recovering method disclosed by the invention has simple process, can be used for simultaneously recovering iron and lithium and can be directly used for production, and the purity of prepared lithium carbonate can reach above 98.5%.

Description

technical field [0001] The invention relates to a method for recovering lithium and iron, in particular to a method for recovering lithium and iron from an electric vehicle lithium iron phosphate power battery. Background technique [0002] Automobile electrification is a major direction for the future development of China's automobiles. According to the "Twelfth Five-Year Special Plan for Electric Vehicle Technology Development", it is estimated that the number of electric vehicles in China will reach 1 million in 2015, and the production capacity of power batteries will reach about 10 billion watt-hours. . A number of domestic and foreign auto companies are fully investing in the research and development of new energy vehicles, and some mass-produced products have already been launched. With the promotion and popularization of new energy vehicles, we will face the severe problem of how to deal with waste power batteries. Power batteries contain a variety of metals and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01G49/02
Inventor 李长东仇健申刘更好余海军
Owner GUANGDONG BRUNP RECYCLING TECH
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