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Method and device for recovering positive electrode material from lithium battery slurry

A positive electrode material and lithium battery technology, which is applied in the field of recycling positive electrode materials, can solve the problems of difficulty in entering the incinerator for barreled materials, high processing pressure, easy agglomeration of materials, sticking to the wall, etc., so as to reduce the burden of processing, reduce decomposition, reduce Effect of degree of pyrolytic agglomeration

Pending Publication Date: 2022-04-22
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can remove organic matter, and the slag produced can be directly leached, but the whole process will produce tail gas such as nitrogen oxides, carbon oxides, and hydrogen fluoride, which needs to be treated and discharged. The treatment pressure is high, and the incineration process The material is easy to agglomerate and stick to the wall, and it is difficult for the barreled material to enter the incinerator

Method used

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  • Method and device for recovering positive electrode material from lithium battery slurry
  • Method and device for recovering positive electrode material from lithium battery slurry
  • Method and device for recovering positive electrode material from lithium battery slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The method for recovering positive electrode material from lithium battery slurry comprises the following steps:

[0085] S1: Take 1000L of waste slurry containing foreign matter such as plastics and cloth strips and shred it in a double-shaft shredder. The A-axis crushing speed is 15r / min, and the B-axis crushing speed is 25r / min;

[0086] S2: The shredded waste slurry is mixed with 2000L of NMP solution with a concentration of 70% to 85%, and then the bubbles are broken, and the pressure of the bubble break is 0.4Mpa, so as to peel off the waste slurry adhered to the foreign matter from the foreign matter , and the waste slurry is broken, and then further broken through step by step overflow;

[0087] S3: Using ferric sulfate as flocculant, the volume ratio between slurry and flocculant is 1000:5 for dispersion stirring and flocculation, wherein the stirring speed is 20r / min, the dispersion speed is 1000r / min, and the dispersion time is 30min;

[0088] S4: Under the ...

Embodiment 2

[0094] The method for recovering positive electrode material from lithium battery slurry comprises the following steps:

[0095] S1: Take 2000L of waste slurry containing foreign matter such as plastics and cloth strips and shred it in a double-shaft shredder. The A-axis crushing speed is 25r / min, and the B-axis crushing speed is 15r / min;

[0096] S2: The shredded waste slurry is mixed with 1000L of NMP solution with a concentration of 70% to 90%, and then the bubbles are broken, and the pressure of the bubble break is 0.8Mpa, so as to peel off the waste slurry adhered to the foreign matter from the foreign matter , and crush the waste slurry, and then further crush the waste slurry into a slurry with a size and a solid content that meets the requirements through step-by-step overflow crushing;

[0097] S3: Using ferric sulfate as flocculant, the volume ratio between slurry and flocculant is 1000:20 for dispersion stirring and flocculation, wherein the stirring speed is 50r / mi...

Embodiment 3

[0104] The method for recovering positive electrode material from lithium battery slurry comprises the following steps:

[0105] S1: Take 1500L of waste slurry containing foreign matter such as plastics and cloth strips and shred it in a double-shaft shredder, the A-axis crushing speed is 20r / min, and the B-axis crushing speed is 20r / min;

[0106] S2: The shredded waste slurry is mixed with 1500L of NMP solution with a concentration of 70% to 85%, and then the bubbles are crushed. The pressure of the bubble crushing is 0.6Mpa, so as to remove the waste slurry adhering to the foreign matter from the foreign matter. , and crush the waste slurry, and then further crush the waste slurry into a slurry with a size and a solid content that meets the requirements through step-by-step overflow crushing;

[0107] S3: Using ferric sulfate as flocculant, the volume ratio between slurry and flocculant is 1000:10 for dispersion stirring and flocculation, wherein the stirring speed is 30r / mi...

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Abstract

The invention discloses a method and a device for recovering a positive electrode material from lithium battery slurry. The method comprises the following steps: shredding waste materials, adding a solvent, and carrying out bubble crushing to obtain first slurry; screening is carried out through a discharging hole; the first slurry with the size smaller than the diameter of the discharging hole is subjected to step-by-step overflow crushing, and second slurry is obtained; performing flocculation and filter pressing to obtain a filter cake and filtrate; and drying, crushing and pyrolyzing the filter cake to obtain the positive electrode material. According to the method, continuous and large-batch treatment of the waste lithium battery slurry can be realized, and the slurry recovery process is simplified. The positive electrode material and the solvent are effectively separated and recycled, the recycling cost is reduced, the whole process is environmentally friendly and energy-saving, the positive electrode powder can be conveniently treated in the later period, the total content of Ni, Co, Mn and Li in the recycled positive electrode powder is 50% or above, and the method has great recycling value.

Description

technical field [0001] The invention belongs to the technical field of lithium battery recovery, and in particular relates to a method and a device for recovering positive electrode materials from lithium battery slurry. Background technique [0002] In the preparation process of nickel-cobalt-manganese ternary lithium-ion batteries, the positive electrode sheet is made of nickel-cobalt-manganese lithium manganate as the positive electrode active material and coated on the current collector. In this process, it is inevitable to produce Waste slurry, its components include NMP (N-methylpyrrolidone), water, conductive agent, positive electrode material and polyvinylidene fluoride (PVDF), etc., also contains foreign materials such as slurry packaging plastic bags, rags and gloves. Because the positive electrode material in the waste slurry contains Ni, Co, and Mn metals, the waste slurry has a great recyclable value; in addition, during the long-term storage of the waste slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 徐治伟申魁文彭冬江志国杨云广李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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