Method for recovering metals from nickel cobalt lithium manganate waste batteries

Abstract

A method for recycling metal from a waste Ni-Co lithium manganate battery comprises the following steps that the waste Ni-Co lithium manganate battery is discharged and disassembled or positive electrode scrap and positive electrode fragments are collected, a waste positive plate is obtained, calcination, dissolution and filtration are conducted on the waste positive plate, and then waste Ni-Co lithium manganate powder is obtained; the waste Ni-Co lithium manganate powder and potassium hydrogen sulfate are mixed according to a certain proportion and then calcined, a calcined product is leached through water, a potassium carbonate solution is added into a solution, filtration is conducted, carbonate is supplemented to adjust the proportion of Li, Ni, Co and Mn in a filter residue, ball grinding, compression and calcination are conducted on the filter residue, and the Ni-Co lithium manganate positive electrode material is obtained again. Constituent adjustment is conducted on filtrate through sulfuric acid, and potassium hydrogen sulfate obtained after crystallization can be reused.

Description

technical field [0001] The invention relates to a technology for recovering metals from nickel-cobalt lithium manganate waste batteries. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. According to statistics, in 2009, the output of lithium-ion batteries in my country reached 1.87 billion, and in 2010, the output of lithium-ion batteries in my country reached 2.68 billion. Since the service life of lithium-ion batteries is generally 2-3 years, the problems of environmental pollution and resource waste caused by discarded lithium-ion batteries have become increasingly prominent. The problem of how to properly dispose of discarded lithium-ion batteries cannot be ignored. The recycling and reuse of resources such as Co, Ni, Mn, Li, Al, and Cu in waste lithium-ion batteries not only overcomes the environme...

AI Technical Summary

Problems solved by technology

[0005] The method for recovering metals from nickel-cobalt-lithium-manganese-oxide waste batteries that have been reported so far uses sulfuric acid, nitric acid, citric acid, and fluorine-containing organic acids to dissolve waste nickel-cobalt-lithium manganese oxide in the recovery process, and inevitably produces Acid gas, NO x Exhaust gas and waste water with high acid content and organic content, which have caused serious pollution to the atmospheric environment and water environment

In addition, the dissolution process uses a higher acid concentration and adds hydrogen peroxide, which has high requirements on the anti-corrosion performance of the leaching equipment and increases the cost of recovery.

The subsequent treatment process after the dissolution of waste nickel cobalt lithium manganese oxide is long, which also makes the cost of recycling high