System and method for recycling valuable metal of lithium ion battery through cooperation of wet grinding and vacuum pyrolysis

The wet grinding-vacuum pyrolysis synergistic recovery method solves the problems of low dissociation efficiency, high energy consumption and heavy environmental pollution in the recovery of valuable metals from lithium-ion batteries in the existing technology. It realizes efficient and low-energy recovery of valuable metals, improves recovery rate and purity, simplifies process and reduces equipment cost.

CN121964918APending Publication Date: 2026-05-01ZHEJIANG UNIV
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Patent Information

Application Number
CN202610145654.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-02
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing dry mechanical separation and inert atmosphere pyrolysis technologies have problems such as low dissociation efficiency, poor selectivity, high energy consumption, easy oxidation of metals, heavy environmental pollution, demanding equipment requirements and weak adaptability to raw materials when recycling valuable metals from lithium-ion batteries. This results in complex recycling processes, high costs and poor environmental benefits.

Method used

A wet grinding-vacuum pyrolysis synergistic recovery method is adopted, which uses water as the grinding medium by wet grinding pretreatment and vacuum pyrolysis at low temperature, combined with ball milling and vacuum pyrolysis furnace, to achieve efficient dissociation of lithium-ion battery cathode materials and targeted recovery of valuable metals.

Benefits of technology

It significantly improves desorption efficiency and selectivity, reduces energy consumption, inhibits metal oxidation, reduces the generation of harmful gases, achieves high recovery rates and high purity of valuable metal products, simplifies processes, and reduces equipment costs and environmental pollution risks.

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Abstract

The invention discloses a system and a method for recycling valuable metals of a lithium ion battery through cooperation of wet grinding and vacuum pyrolysis. The recycling method comprises the following steps: completely discharging a waste lithium ion battery, disassembling and separating a positive plate and a negative plate, crushing and sieving, and collecting undersize powder; mixing with a grinding medium, and carrying out ball milling by adopting a ball milling tank; the slurry is sieved after being dried, and screen underflow is collected and is electrode black powder; putting the electrode black powder into a vacuum pyrolysis reactor, vacuumizing and then pyrolyzing; and after the pyrolysis is finished, cooling to room temperature under vacuum or inert gas protection to obtain a valuable metal solid product. The method is carried out at a relatively low temperature, metal oxidation can be inhibited, generation of harmful gas is reduced, separation and pyrolysis with higher adaptability to raw materials are realized, and directional recovery is realized.
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