Method for recovering cobalt and lithium metals from waste lithium cobalt oxide battery

Abstract

The invention provides a method for recovering cobalt and lithium metals from a waste lithium cobalt oxide battery. The method is characterized by comprising the following steps: (1) carrying out discharge treatment on the waste lithium cobalt oxide battery, and carrying out disassembly, crushing, pyrolysis and screening to obtain black lithium cobalt oxide powder; (2) mixing the black lithium cobalt oxide powder obtained in the step (1) with ammonium salt according to a molar ratio of 1: (1.5-4), putting the mixture into a high-temperature ball mill for enhanced ammonia process roasting to convert the lithium cobalt oxide into sulfate, performing water leaching to obtain a leaching solution rich in Co < 2 + > and Li < + >, recycling ammonia gas generated in the process, and recycling andreusing the ammonia gas in the form of ammonium sulfate; and (3) selectively recovering cobalt and lithium components from the leaching solution rich in Co < 2 + > and Li < + > obtained in the step (2), recovering cobalt by using an organic extracting agent, recovering lithium in residual liquid by using a precipitation method, and recovering the lithium in the form of lithium carbonate. The method meets the requirements of environmental protection, low consumption, high efficiency and short-process recovery of valuable metals from the waste lithium ion battery.

Description

technical field [0001] The invention relates to a treatment method for waste lithium ion batteries, in particular to a method for recovering cobalt and lithium metals from waste lithium cobalt oxide batteries. Background technique [0002] In recent years, due to energy shortage and environmental protection requirements, the transformation and development of chemical fuel energy to new energy has been promoted. Therefore, lithium-ion batteries have developed rapidly since their commercialization in 1991. Compared with commonly used lead-acid batteries, nickel-copper batteries and other traditional batteries, lithium-ion batteries have higher theoretical capacity and volumetric energy density, and also have long working hours, high safety performance, no memory effect, and environmental friendliness. series of advantages, so it can be widely used as an excellent energy storage device in electronic equipment, such as mobile phones, computers, digital cameras, power batteries a...

AI Technical Summary

Problems solved by technology

[0011] To sum up, the common problems currently faced in the extraction and recovery of valuable components in waste lithium-ion battery materials include: (1) The consumption of acid and alkali and other chemical reagents in the process of leaching and recovery is large, and the waste liquid generated is difficult to handle; (2) ) The energy consumption caused by high temperature conditions in the fire recovery process is large, and the selective extraction rate is low; (3) The process is long and the operation is complicated

Images