Method for recovering lithium from low-lithium-content battery waste

Abstract

The invention provides a method for recovering lithium from low-lithium-content battery waste, most of lithium elements are in extraction raffinate of cobalt, manganese, nickel and other metal ions recovered by a wet method from the source of the battery waste, and due to the fact that the lithium content in the extraction raffinate is low (generally 1.5-2.0 g/L), low-cost recovery of lithium is achieved. And the problems of environmental pollution and resource waste caused by the fact that the recovery cost is high by adopting evaporation, concentration and crystallization means and the like on the residual lithium at present, or the residual lithium is not recovered and the tail water is directly discharged after being treated are solved.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a method for recovering lithium from battery waste with low lithium content. Background technique [0002] Lithium-ion batteries have developed rapidly in the battery market due to their special energy storage properties, but as lithium batteries are charged and discharged in cycles, they need to be recycled after their lifespan expires. At present, the general steps of recycling waste lithium-ion batteries are disassembly, screening, crushing and extraction, and the crushed cathode powder is then subjected to wet or fire processing to obtain the desired product. The advantage of wet treatment is that the recovery rate is high, up to about 90%, but the treatment process is complicated and the treatment cost is relatively large. In the wet recovery process, lithium is usually extracted last. Generally, after the extraction of cobalt, manganese, nickel and other met...

AI Technical Summary

Problems solved by technology

The advantage of wet treatment is that the recovery rate is high, which can reach about 90%, but the treatment process is complicated and the treatment cost is relatively high

And in the wet recovery process, lithium can usually be extracted last. Generally, after extracting metal ions such as cobalt, manganese, and nickel, most of the remaining lithium elements are in the raffinate, because the lithium content in the raffinate is low at this time. (Generally 1.5~2.0g / L), making it more difficult to enrich again, the recovery cost is high by means of evaporation, concentration and crystallization, and it is often not recovered, and the tail water is discharged after treatment, causing environmental pollution and waste of resources

The fire method refers to adding the positive electrode powder to the slagging agent and then melting the slag at a high temperature above 1300°C to separate valuable metals. Although the fire method has a large amount of treatment and a simple process, the recovery rate of lithium is very low. The current industry basically no use

[0003] Therefore, in addition to the extraction method, how to separate lithium and ternary metal ions M (nickel, cobalt, manganese, aluminum, etc.) The efficient separation of ions M, further and how to realize lithium recovery from the source of battery waste and low content (generally 1.5~2.0g / L) lithium recovery related technologies and recovery devices have not yet been reported.

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