Recycling method of scrapped ternary lithium battery

Abstract

The invention discloses a recycling method a scrapped ternary lithium battery. The recycling method comprises the following steps: 1, dismantling the scrapped ternary lithium battery into lithium battery monomers, and performing discharging treatment; 2, performing crushing treatment on the lithium battery monomers; 3, performing super-critical carbon dioxide extraction treatment on the battery crushed slurry in an extraction tank; 4, on the one hand, performing pressure reducing treatment on the extraction moving phase; on the other hand, performing sorting treatment on the residual solid mixture; 5, adding a solution formed by mixing sulfuric acid and hydrogen peroxide in the metal solid mixture; 6, performing filtering treatment on the acid solid-liquid mixture; 7, adjusting a pH valueof the acid mixed solution to 7-7.5, filtering and recycling; 8, adjusting the pH value of the mixed solution containing ternary metal components to 11-14, and filtering and recycling; and 9, adding adequate amount of sodium carbonate solution in the solution containing less lithium salt, and filtering and recycling. The electrolyte is recycled in a solution form, and a recovery rate can reach 90%and more.

Description

technical field [0001] The invention relates to the technical field of power battery recycling and processing, in particular to a recycling method for scrapped ternary lithium batteries. Background technique [0002] At present, the recovery process of scrapped ternary lithium batteries mainly includes discharge steps, crushing steps, roasting steps, physical separation steps, and hydrometallurgical recovery steps of Ni, Co, Mn, Li and other metal elements. This crushing recovery process cannot separate and recover electrolytic Liquid, the subsequent sorting products contain electrolyte decomposition products, such as fluoride, phosphide, etc., which affect the recovery rate of hydrometallurgical recovery. Electrolyte is usually recovered by extraction process. At present, solution and / or supercritical carbon dioxide are also used for extraction and recovery. However, the current collector in the lithium battery is decomposed and then extracted separately. The extraction eff...

AI Technical Summary

Problems solved by technology

[0002] At present, the recovery process of scrapped ternary lithium batteries mainly includes discharge steps, crushing steps, roasting steps, physical separation steps, and hydrometallurgical recovery steps of Ni, Co, Mn, Li and other metal elements. This crushing recovery process cannot separate and recover electrolytic Liquid, the subsequent sorting products contain electrolyte decomposition products, such as fluoride, phosphide, etc., which affect the recovery rate of hydrometallurgical recovery

Electrolyte is usually recovered by extraction process. At present, solution and / or supercritical carbon dioxide are also used for extraction and recovery. However, the current collector in the lithium battery is decomposed and then extracted separately. The extraction efficiency is particularly low and it is difficult to realize industrial operation.

Images