Method for separating and recycling graphite and copper sheets in negative pole materials of waste lithium ion batteries

A lithium-ion battery and negative electrode material technology, which is applied in the field of separation and recovery of graphite and copper flakes in waste lithium-ion battery negative electrode materials, can solve the problems of high energy consumption in the purification process, low graphite ore grade, and low graphite recovery rate. Achieve the effects of high recovery rate and product added value, low energy consumption, and cheap raw materials

Active Publication Date: 2014-03-05
GUANGDONG BRUNP RECYCLING TECH +1
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Problems solved by technology

[0002] Graphite is China's dominant mineral resource, with reserves of 55 million tons, accounting for 77% of the world's total. However, the grade of graphite ore is low (the fixed carbon content of crystalline graphite ore generally does not exceed 10%), and its purification process has high energy consumption. , long cycle, low recovery rate of graphite and serious water pollution etc.

Method used

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  • Method for separating and recycling graphite and copper sheets in negative pole materials of waste lithium ion batteries
  • Method for separating and recycling graphite and copper sheets in negative pole materials of waste lithium ion batteries
  • Method for separating and recycling graphite and copper sheets in negative pole materials of waste lithium ion batteries

Examples

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Effect test

Embodiment 1

[0032] Soak a 1kg waste lithium battery negative electrode piece in 10L0.2mol / L dilute sulfuric acid for 10 minutes, then use a speed-regulating oscillator and a submersible pump to create a tumbling water flow in the container to wash away the negative electrode material. The role is to make the separation of graphite and copper sheets more rapid and thorough. The speed of the speed-adjusting oscillator is 240r / min, the power of the submersible pump is 60w, the working time is 10min, and then stand for 5min. Sieve and sieve to obtain copper flakes on the sieve and graphite on the sieve.

[0033] After taking out the copper sheet with dilute sulfuric acid attached to the surface, soak it in an ultrasonic cleaning machine for 2 minutes, then filter it out and place it in a blast drying oven, and dry it to a constant weight at 50°C to obtain a 315g high Pure copper sheet.

[0034] When the flake graphite in the container sinks to the bottom of the container, drain the 10L dilut...

Embodiment 2

[0044] Soak a 1kg waste lithium battery negative electrode piece in 10L0.3mol / L dilute hydrochloric acid for 8 minutes, and then use a speed-regulating oscillator and a submersible pump to create a tumbling water flow in the container to wash away the negative electrode material. The function makes the separation of graphite and copper sheet more rapid and thorough. The speed of the speed-regulating oscillator is 240r / min, the power of the submersible pump is 60w, the working time is 6min, and then stand still for 10min. Sieve and sieve to obtain copper flakes on the sieve and graphite on the sieve.

[0045] After taking out the copper sheet with dilute hydrochloric acid attached to the surface, immediately soak it in an ultrasonic cleaning machine for 5 minutes, then filter it out and place it in a blast drying oven, and dry it to a constant weight at 60°C to obtain a 312g high Pure copper sheet.

[0046] After the flake graphite in the container sinks to the bottom of the c...

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Abstract

The invention discloses a method for separating and recycling graphite and copper sheets in negative pole materials of waste lithium ion batteries. The method comprises the steps of (1) separating graphite from copper sheets; (2) removing a separating solvent on the copper sheets; (3) removing impurities in crude graphite products; and (4) processing the graphite products at high temperature so as to obtain high purity copper sheets and high-carbon graphite finally. The method has simple steps, the raw materials are abundant and cheap, the recovery rate and additional value of the products are high.

Description

technical field [0001] The invention belongs to the field of classified recovery and recycling of resources, and in particular relates to a method for separating and recycling graphite and copper flakes in anode materials of waste lithium-ion batteries. Background technique [0002] Graphite is China's dominant mineral resource, with reserves of 55 million tons, accounting for 77% of the world's total. However, the grade of graphite ore is low (the fixed carbon content of crystalline graphite ore generally does not exceed 10%), and its purification process has high energy consumption. , long cycle, low graphite recovery rate and serious water pollution. The current commercial lithium-ion battery anode materials are mainly artificial graphite, natural graphite and various modified graphites, among which the fixed carbon content of graphite can be as high as 85%, which is much higher than the grade of graphite ore. Therefore, if the graphite in the negative electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 周顺周汉章谭静进
Owner GUANGDONG BRUNP RECYCLING TECH
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