Method for recycling fluorine and lithium from waste electrolyte of lithium battery

Abstract

The invention discloses a method for recycling fluorine and lithium from waste electrolyte of a lithium battery. The method comprises the following steps: (1) putting CaO or Ca(OH)2 into waste lithiumbattery electrolyte, enabling Ca<2+> to react with fluorine ions in the electrolyte to generate CaF2 precipitate, leaving to stand and layer, and further carrying out solid-liquid separation so as toobtain CaF2 and a defluorination solution; (2) introducing the defluorination solution into an adsorption device with a manganese fiber and a titanium fiber, carrying out adsorption treatment, and enriching lithium ions in the defluorination solution through the manganese fiber and the titanium fiber; (3) soaking the manganese fiber and the titanium fiber into an acid solution, so as to obtain alithium salt solution. By adopting the method, CaO or Ca(OH) 2 is enabled to react with the waste lithium battery electrolyte firstly, Ca<2+> is enabled to react with the fluorine ions in the electrolyte to generate CaF2, later physical oriented adsorption on lithium ions is carried out by using a multi-stage manganese fiber adsorption column and a titanium fiber adsorption column, then fluorine and lithium in the electrolyte can be recycled, and both the fluorine and the lithium are recycled and environment pollution can be reduced.

Description

technical field [0001] The invention relates to the recovery of lithium battery waste electrolyte, in particular to a method for recovering fluorine and lithium from the lithium battery waste electrolyte. Background technique [0002] In the context of the era of green and environmental protection, new energy vehicles have grown rapidly in recent years, and vehicle power batteries have also experienced explosive development. In the near future, there will inevitably be a large number of recycling problems for scrapped and decommissioned batteries. In the next few years, there will be a large number of power batteries facing severe recycling problems. The recycling of power batteries is imminent. Lithium power batteries are the mainstream of automotive power batteries. Therefore, research on the recycling of lithium power batteries is of great significance for environmental protection and sustainable development of resources. [0003] In the research on the recycling of lith...

AI Technical Summary

Problems solved by technology

[0004] At present, the recovery of the electrolyte mainly has the following methods: (1) incineration of the electrolyte, which is easy to pollute the air environment; (2) alkali neutralization, that is, to neutralize the pH of the electrolyte to about 7, and then discharge it into the environment. method pollutes groundwater

Due to the problem of cost, the current treatment method only achieves reduction treatment and does not recover fluorine, lithium and calcium elements, which not only pollutes the environment but also wastes resources

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