Physical sorting, subsequent separation, reuse.
1. Physical sorting: The composition of the crushed products obtained after pretreatment is relatively complex, including lithium battery case, positive electrode material, negative electrode material, copper current collector, current collector aluminum current, separator, electrolysis liquid, etc. At present, physical separation methods, such as screening, gravity separation, flotation, magnetic separation, etc., are used to classify crushed products to obtain positive electrode materials, negative electrode materials, separators, current collectors, etc.
2. Further separation: heat treat the positive electrode material and negative electrode material, and then further separate valuable materials such as lithium cobalt oxide and graphite by fbatching and other methods. The principle of pyrometallurgy is that mixed materials are reduced and roasted. The binder and other organic materials escape in the form of gas. Most of the low-boiling lithium oxide escapes as vapor and is absorbed and recycled with water. Other metals (copper, nickel, cobalt, etc.) A metal alloy is formed, which is then processed by hydrometallurgical techniques.
3. Reuse: The separated lithium, metal ions and electrolyte solution can be reused. The lithium can be used to make new batteries or for other applications, the metal ions can be made into new metal parts, and the electrolyte can be processed and reused in new batteries.
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