Lithium recycling process

Abstract

The invention provides a lithium recycling process. The lithium recycling process comprises the following steps of performing cooling on a lithium-containing waste to a low enough temperature; performing smashing on the cooled lithium-containing waste; putting the cooled and smashed lithium-containing waste into water to be reacted to generate a lithium salt; by adding LiOH, maintaining the pH value of a water solution to be high enough to prevent from formation of H<2>S; and enabling the lithium salt generated by the reaction between the lithium-containing waste and water to be separated out,and performing cooling through a nitrogen liquid, thereby lowering lithium reaction activity. The cooled components are smashed and then the reaction is performed, so that the reaction speed is accelerated; through a deposition method, the lithium compound is obtained, so that collection of the lithium compound can be realized conveniently; finally, the lithium salt is dissolved in low-concentration sulfuric acid, so that further purification can be realized; and meanwhile, LiOH generated in the reaction can be finally converted into LiCO<3> and can be separated out in a precipitation manner,so that the lithium recycling process has the advantages of no toxic, cleanliness, high safety, high economic benefits and the like.

Description

technical field [0001] The invention relates to the technical field of lithium recovery and reuse, and specifically relates to a lithium recovery and reuse process. Background technique [0002] Lithium batteries have been widely used in recent years because of their high energy density and high reliability. After the lithium battery reaches its service life, people pay more and more attention to its recycling and reuse, considering its impact on the environment and economic benefits. However, In the recycling process of Li, there are not only the instability and toxicity of the metal itself, but also the reactivity, corrosion and toxicity of various by-products and intermediate compounds produced in the recycling process. Li is easily polluted by specific substances in the process, so that the recycling rate and economic benefits are not high. [0003] In response to the above problems, a series of methods have been designed to improve the recycling rate of Li and the safe...

AI Technical Summary

Problems solved by technology

[0004] In the process of the reaction of Li-containing substances to generate various salts, in order to avoid the reaction to generate toxic H 2 S, it is very important to keep the solution at a high pH value. The typical treatment method is to add NaOH to the solution, but at the same time the concentration of Na ions must be strictly controlled to avoid Na pollution in the final salt. Ions are generally difficult to remove, and the high concentration of Na pollution will make pure Li recovery inefficient, thereby reducing economic benefits, so a safe and more efficient method for Li recovery from lithium batteries is needed

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