Method for recycling waste lithium battery

Abstract

The invention discloses a method for recycling a waste lithium battery. The method solves the problem that when a physical separation method in a dry recycling method is used, because battery components such as an electrode active material, a current collector and a battery casing are pulverized and classified after crushed, sieved, and primarily magnetically separated, metal particles may containdifferent elements due to the reason that the metal particles are not sufficiently pulverized and refined, thereby causing difficulty in accurately recycling the metal in subsequent chemical leaching, and difficulty in completely separately recycling the metal due to metal loss caused by mechanical entrainment which is possibly generated in the magnetic separation process. The method comprises disassembly and separation, crushing, sieving, crushing and pulverizing, preliminary magnetic separation, ball milling pulverizing, secondary magnetic separation and final classification.

Description

technical field [0001] The invention relates to the field of lithium battery recycling, in particular to a method for recycling waste lithium batteries. Background technique [0002] The recycling process of waste lithium-ion batteries mainly includes pretreatment, secondary treatment and advanced treatment. Since there is still some electricity left in the used batteries, the pretreatment process includes deep discharge process, crushing, and physical separation; the purpose of secondary treatment is to realize the complete separation of positive and negative active materials from the substrate, and heat treatment and organic solvent dissolution are commonly used. , lye dissolution method and electrolysis method to realize the complete separation of the two; advanced treatment mainly includes two processes of leaching and separation and purification to extract valuable metal materials. According to the classification of extraction process, battery recycling methods can be ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a recycling method for waste lithium batteries, to solve the problem of battery components such as electrode active materials, current collectors and battery shells being crushed, screened, and once used in the physical separation method of dry recycling. After magnetic separation and separation, crushing and classification are carried out, which is prone to metal particles with various elements entrained in the metal particles due to insufficient crushing and refinement of the metal particles, which makes it difficult to achieve accurate recovery of metals in subsequent chemical leaching, and due to In the process of magnetic separation, it is easy to have the problem of metal loss caused by mechanical entrainment, and it is difficult to realize the complete separation and recovery of metals.

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