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Method and equipment for recovering lithium battery slurry

A recycling method and technology for lithium batteries, applied in battery recycling, recycling technology, separation methods, etc., can solve problems such as unfavorable industrial application, poor centrifugal effect, easy introduction of impurities, etc. The effect of NMP purity

Active Publication Date: 2021-11-16
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the core technology of NMP slurry recovery is the solid-liquid separation of slurry, mainly including centrifugal separation, flocculation filter separation and other recovery methods. The related technology discloses a recycling method for lithium battery positive electrode waste slurry, which uses a centrifuge Solid-liquid separation, but the efficiency is low, the processing capacity is small, and the centrifugation effect is poor, which is not conducive to industrial application
There is also a related technology that discloses a treatment method and application of lithium battery cathode waste liquid. The cathode waste liquid is injected into the treatment tank, then a flocculant is added to the treatment tank, stirred and left still, and the supernatant is directly fed into the sewage treatment. For precipitation, the diatomite is stirred evenly, and finally the diatomite slurry is press-filtered to obtain the filtrate and filter residue, but the flocculation-pressing process is complicated and impurities are easily introduced

Method used

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  • Method and equipment for recovering lithium battery slurry
  • Method and equipment for recovering lithium battery slurry
  • Method and equipment for recovering lithium battery slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A centrifugal spray drying system, consisting of a spray chamber 100, two cyclone separators 200, a bag filter 300, a condenser 400, a condensate storage tank 500, a rectification tower 600, an aqueous phase collector 700 and an NMP collector 800 The upper part of the spray chamber 100 is provided with a centrifugal nozzle 110, and the two sides are respectively provided with a hot air inlet 120 and a hot air outlet 130, and the hot air outlet 130 is connected with the inlet of the cyclone separator 200, the cyclone separator 200, the bag filter 300, the condensation The device 400, the condensate storage tank 500 and the rectification column 600 are connected in sequence.

[0036] A kind of recovery method that contains NMP waste lithium battery slurry, concrete steps are as follows:

[0037] S1: Take 1000L NMP waste slurry and use a dual-shaft crusher with a knife distance of 50mm for coarse crushing at a speed of 100r / min. Take the NMP waste slurry and put it in a ba...

Embodiment 2

[0041] A centrifugal spray drying system, consisting of a spray chamber 100, two cyclone separators 200, a bag filter 300, a condenser 400, a condensate storage tank 500, a rectification tower 600, an aqueous phase collector 700 and an NMP collector 800 The upper part of the spray chamber 100 is provided with a centrifugal nozzle 110, and the two sides are respectively provided with a hot air inlet 120 and a hot air outlet 130, and the hot air outlet 130 is connected with the inlet of the cyclone separator 200, the cyclone separator 200, the bag filter 300, the condensation The device 400, the condensate storage tank 500 and the rectification column 600 are connected in sequence.

[0042] A kind of recovery method that contains NMP waste lithium battery slurry, concrete steps are as follows:

[0043] S1: Take 1000L NMP waste slurry and use a dual-shaft crusher with a knife distance of 10mm for coarse crushing at a speed of 500r / min. Take the NMP waste slurry and put it in a ba...

Embodiment 3

[0047] A centrifugal spray drying system, consisting of a spray chamber 100, two cyclone separators 200, a bag filter 300, a condenser 400, a condensate storage tank 500, a rectification tower 600, an aqueous phase collector 700 and an NMP collector 800 The upper part of the spray chamber 100 is provided with a centrifugal nozzle 110, and the two sides are respectively provided with a hot air inlet 120 and a hot air outlet 130, and the hot air outlet 130 is connected with the inlet of the cyclone separator 200, the cyclone separator 200, the bag filter 300, the condensation The device 400, the condensate storage tank 500 and the rectification column 600 are connected in sequence.

[0048] A kind of recovery method that contains NMP waste lithium battery slurry, concrete steps are as follows:

[0049] S1: Take 1000L NMP waste slurry and use a dual-shaft crusher with a knife distance of 30mm for coarse crushing at a speed of 300r / min. Take the NMP waste slurry and put it in a ba...

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Abstract

The invention discloses a method for recycling lithium battery slurry, which comprises the following steps of: pretreating the lithium battery slurry, performing centrifugal spray drying on the pretreated lithium battery slurry, and separating a solid phase from a solvent. According to the method, a positive electrode material and NMP can be completely and efficiently separated by adopting centrifugal spraying, impurity elements are not introduced in the process, the purity of the NMP is improved, the treatment cost is low, meanwhile, the pollution to the environment is reduced, and the method has a very good industrial application prospect. The invention also discloses equipment for recycling the lithium battery slurry, which is a centrifugal spray drying system and comprises a spray chamber, a cyclone separator, a condenser, a condensate storage tank and a rectifying tower. The system improves original centrifugal spray drying equipment, and is designed by combining centrifugal spray drying with NMP condensation recovery processes, so that NMP can be directly recovered after the positive electrode material and NMP are separated, the treatment efficiency is high, and continuous production can be realized.

Description

technical field [0001] The invention belongs to the technical field of battery material recycling, and in particular relates to a method for recycling waste lithium battery slurry containing NMP and equipment for recycling it. Background technique [0002] The production process of lithium batteries is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. Among them, in the first stage of the process, since the positive electrode material needs to be bonded by PVDF to bond with the aluminum foil to form a pole piece, but PVDF is a solid powder, it is necessary to dissolve PVDF with NMP and stir it evenly with the positive electrode material to form a stable electrode sheet. However, due to the failure of the slurry due to changes in the environment, foreign matter, and viscosity during the slurrying and coating process, the slurry cannot be coated normally. Since the slurry contains a large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/18B01D5/00B01D50/00H01M10/54
CPCB01D1/18B01D5/006H01M10/54Y02W30/84Y02A50/2351B01D1/14H01M10/0525H01M10/052C22B7/005
Inventor 宁培超李长东周游李强阮丁山陈嵩
Owner GUANGDONG BRUNP RECYCLING TECH
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