Method for recycling spent lithium-ion batteries to manufacture NCM salt

Abstract

The invention provides a method for recycling spent lithium-ion batteries to manufacture NCM salt (a sulfate mixture containing nickel, cobalt and manganese). The process comprises the steps of crushing, pyrolyzing, sorting, leaching, purifying, dosing and crystalizing. The method provided by the invention has the beneficial effects that on one hand, no soluble alkali metal ions (such as potassiumand sodium) is carried in the whole production process, so that water recycling can be realized, wastewater zero discharging is realized, and a lot of water resources are saved; on the other end, after a purification liquid is dosed, a certain proportion of NCM salt is obtained by utilizing a crystalizing principle, so that an extraction process is avoided in the process, and the generation of alot of wastewater and waste gas is avoided. In addition, the NCM slat provided by the invention can be used as a raw material for producing a precursor, and according to a proportion requirement of the precursor material, bits of nickel sulfate, cobaltous sulfate and manganese sulfate are used for adjusting so as to accomplish the preparation before precursor synthesis, so that the process is simplified, and meanwhile, the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of recycling waste lithium ion batteries, in particular to a method for recycling and preparing NCM salts from waste lithium ion batteries. Background technique [0002] The recycling and resource utilization of waste batteries has become an important issue that must be faced in my country's environmental protection and sustainable development of the battery industry. my country is currently the largest battery production and consumption country in the world. With the popularization of mobile phones, notebook computers, digital products and other portable products, rechargeable batteries such as lithium-ion batteries have become consumer goods for people's daily life; especially nickel-cobalt-manganese With the explosion of electric vehicles with lithium-ion batteries made of primary materials, the amount of scrapped batteries produced has also increased exponentially. Because waste batteries contain heavy metals, org...

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Problems solved by technology

[0003] At present, the existing technologies for recycling lithium-ion batteries generally adopt pyrolysis, crushing, sorting, leaching, impurity removal, nickel-cobalt-manganese extraction, and precursor synthesis processes; in this process, the extraction process will use extractants , organic solvents, sodium hydroxide, and hydrochloric acid will produce a large amount of organic volatile substances and waste water, which will bring huge pressure to the environment. Although the use of environmental protection facilities can achieve certain effects, it will also bring certain pressure to production costs; In particular, organic solvents are flammable and explosive, and there are certain safety hazards

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