Method for extracting lithium from waste lithium ion battery and application thereof

Abstract

The invention discloses a method for extracting lithium from a waste lithium ion battery. The method comprises the following steps: mixing battery black powder with carbon, grinding and thermally desorbing; carrying out water immersion on a product after thermal desorption, and filtering to obtain a lithium-containing aqueous solution; and adjusting the pH value of the lithium-containing aqueous solution with sodium salt, concentrating and filtering to obtain a lithium carbonate product. The method for extracting the lithium from the waste lithium ion battery has the advantages that the lithium recovery process is short, the operation is simple, and the recovery rate is high; the active carbon powder is adopted as an extracting agent, lithium is extracted through thermal desorption, the lattice structure of metal oxide is destroyed, dissolution of the cathode material by downstream hydrometallurgy enterprises is facilitated, and no additional additive needs to be added; only the activated carbon powder is added, other chemical substances are not added in the main production line process, no new'three wastes' are discharged, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to the technical field of recycling waste batteries, in particular to a method for extracting lithium from lithium-ion batteries and its application. Background technique [0002] According to the "Technology Roadmap for Energy-Saving and New Energy Vehicles" issued by the Society of Automotive Engineers of China, by 2030, the proportion of new energy vehicle sales in total vehicle sales will rise to about 40%. In 2035, new energy vehicles will account for more than 50% of total vehicle sales. Accompanied by it, the generation of a large number of waste lithium-ion batteries will pose a severe challenge to the disposal of electronic waste and environmental protection in my country and the world. On the one hand, waste lithium-ion batteries contain toxic and flammable electrolytes, heavy metals and other harmful components. If not handled properly, it will cause serious water and soil pollution, and even cause fires, explosions an...

AI Technical Summary

Problems solved by technology

[0003] Although there are some recycling methods for lithium ion batteries in the prior art, they are generally acid or alkali leaching processes to prepare products such as lithium carbonate or lithium hydroxide, and the acid dissolution in the existing lithium ion dissolution process will cause some Co, Impurities such as Ni, Mn, Cu are stripped out; Alkali dissolution will lead to the increase of Al ion dissolution, causing the impurities in the lithium-rich solution to be high; The low-acid solution controls the impurities in the final lithium-rich solution to be low, but the process is relatively complicated, with many control points and high work intensity in practical applications

At the same time, the added value of products extracted by these existing methods is all low

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