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