Method for recovering valuable metal from waste power battery cathode waste material

Abstract

The invention discloses a method for recovering valuable metal from a waste power battery cathode waste material. The method comprises the following steps that (1) the waste power battery cathode waste material is subjected to acid dipping treatment, and a nickel cobalt manganese and lithium containing mixed solution is obtained; (2) the nickel cobalt manganese and lithium containing mixed solution is subjected to impurity removal, nickel cobalt manganese and lithium containing purified liquid and impurity removed liquid or impurity removed residue are obtained; (3) nickel cobalt and manganeseare separated from the nickel cobalt manganese and lithium containing purified liquid through a selective co-extraction method, and nickel cobalt and manganese containing strip liquid and lithium-rich extraction raffinate are obtained; (4) lithium-rich extraction raffinate is subjected to deep impurity removal treatment, and lithium-rich purified liquid and impurity removal liquid or impurity removal residue are obtained; (5) the lithium-rich purified liquid is treated by adopting a bipolar membrane electrodialysis method after being subjected to deep degreasing treatment, and a lithium hydroxide solution and a sulfuric acid solution are generated; and (6) the lithium hydroxide solution is evaporated and concentrated, and a battery-level lithium hydroxide monohydrate and concentrated mother liquid are obtained. The recovery rate of nickel cobalt manganese and lithium is higher than 98%, and appreciation of metal products is achieved while the valuable metal is efficiently recovered.

Description

technical field

[0001] The invention belongs to the technical field of recovering valuable metals, and in particular relates to a method for recovering valuable metals from waste power batteries. Background technique

[0002] In recent years, the rapid growth of the new energy vehicle market has brought about the rapid development of the power battery industry, but it is also facing the problem of decommissioning a large number of power batteries. Since the service life of power batteries is generally 5-8 years, this means that the new energy batteries put into the market in the early stage are basically at the critical point of elimination. Although power batteries are rich in valuable metal resources, from the perspective of chemical toxicity, the organic components and heavy metal components they contain make them have obvious hazardous waste characteristics. Therefore, whether it is from the perspective of green development or from the perspective of economy, the reuse ...

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