Method for recovering lithium battery slurry and device for recovery of same

Patent metadata

Field	Value
Publication number	US-11894531-B2
Application number	US-202218270471-A
Country	US
Kind code	B2
Filing date	Jun 6, 2022
Priority date	Jul 15, 2021
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A method for recovering lithium battery slurry, the method comprising: pretreating lithium battery slurry, and then subjecting the pretreated lithium battery slurry to centrifugal spray drying to separate a solid phase and a solvent. A device for the recovery of lithium battery slurry is a centrifugal spray drying system, and comprises a spray chamber ( 100 ), a cyclone separator ( 200 ), a condenser ( 400 ), a condensate storage tank ( 500 ), and a rectification tower ( 600 ); the system improves upon original centrifugal spray drying devices, and is designed to combine the processes of centrifugal spray drying and NMP condensation recovery, such that NMP can be directly recovered after separation of positive electrode material and the NMP.

First claim

What is claimed is:

1. A recovery method for a lithium battery slurry, comprising:
S 1 : roughly crushing a waste lithium battery slurry containing NMP, and then ball milling to obtain a ball milled slurry;
S 2 : sieving the ball milled slurry, and adjusting a pH value of the slurry passed through the sieve; wherein the pH value is adjusted to a range of 7.0 to 8.0;
S 3 : centrifugal spray-drying the pH-adjusted slurry to obtain a solid powder, and condensing and purifying the gas-phase NMP; wherein the centrifugal spray-drying is performed at a temperature of 150° C. to 300° C.

2. The recovery method according to claim 1 , wherein the ball milling is performed in a ball-to-material ratio of (5-50):1 at a rotation speed from 300 r/min to 1000 r/min.

3. The recovery method according to claim 1 , wherein the sieving is performed with a 100- to 300-mesh.

4. The recovery method according to claim 1 , wherein a feeding rate is 800 L/h to 1500 L/h; and a centrifugal speed is 8000 r/min to 25000 r/min.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Ning Peichao
• Li Changdong
• Zhou You
• Li Qiang
• Ruan Dingshan
• Chen Song

Classifications

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• Y02A50/2351

  Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust · CPC title

• H01M10/54 Primary

  Reclaiming serviceable parts of waste accumulators · CPC title

• B01D1/18 Primary

  to obtain dry solids (B01D1/24 takes precedence) · CPC title

• B01D5/006 Primary

  with evaporation or distillation · CPC title