Method for recycling valuable metal in waste nickel-cobalt-manganese ternary lithium-ion battery

Abstract

The invention belongs to the field of recycling of valuable materials of waste lithium-ion batteries and particularly discloses a method for efficiently cleaning and recycling valuable metal in a waste ternary lithium-ion battery. The method comprises the following steps that (1) the waste ternary LNCM lithium-ion battery is subjected to short-circuit discharging, disassembly, stripping through abinding agent and smashing screening to obtain an electrode active material; the electrode active material is subjected to reduction-acid leaching, and solid-liquid separation is conducted to obtain acarbon material and an acid leachate containing Li+, Ni2+, Co2+, Mn2+, Fe3+, Al3+ and Cu2+; (2) the pH of the acid leachate is regulated and controlled within 3-5, and Fe3+ and Al3+ in the acid leachate are precipitated; then through solid-liquid separation, impurity-removal filtrate with Li+, Ni2+, Co2+ and Mn2+ is obtained; (3) the pH of the impurity-removal filtrate is adjusted to 1-6, then the filtrate is used as an electrolyte and subjected to rotational flow electrolysis, Cu / Co-Ni alloy composite film is collected at a negative electrode, and MnO2 is collected at a positive electrode. According to the method, a rotational flow electrolysis mode is innovatively adopted, and effective components in the leachate is efficiently recycled.

Description

technical field [0001] The invention relates to the field of waste lithium ion battery recycling, in particular to a high-value recovery of waste ternary nickel-cobalt lithium manganate lithium ion battery, which belongs to the field of waste lithium ion battery recycling. Background technique [0002] With the rapid development of modern science and technology, the problem of social energy and environmental ecological pollution has become increasingly prominent, and the environmental and ecological pollution of various waste batteries has become the focus of social attention. Nickel-cobalt manganese oxide lithium-ion batteries are widely used in power batteries and energy storage batteries due to their high capacity, stable cycle performance, and high working platform voltage. Power and energy storage batteries usually require more battery materials than conventional small batteries. Therefore, in the next 3-5 years, a large number of nickel-cobalt lithium-manganese oxide b...

AI Technical Summary

Problems solved by technology

[0003] However, the current domestic technical route for recycling waste nickel-cobalt-manganese acid batteries still has defects. The mainstream methods for treating the leachate of waste nickel-cobalt-manganese-manganese acid batteries are: 1) Precipitate to remove copper and then adjust the ratio of nickel, cobalt, manganese, and manganese. Precipitation; 2) extraction to remove copper, then extracting nickel, cobalt, manganese and acid stripping to obtain a salt solution containing only nickel or cobalt or manganese

For example, the Chinese patent CN105206889 A published "a treatment method for the positive electrode material of waste nickel-cobalt lithium manganese oxide ternary battery" utilizes acid leaching to recover valuable metals in nickel-cobalt lithium manganese oxide waste batteries, and first removes impurities by precipitation. Then add alkali to co-precipitate nickel-cobalt-manganese to prepare the precursor. Although this method overcomes the problem of low purity of nickel salt, cobalt salt, and manganese salt by precipitation and recovery separately, the operation is relatively simple, but it has high requirements for the depth of impurity removal in the leachate.

However, simple chemical precipitation cannot fully meet the requirements, and the co-precipitation reaction time is long, and the conditions are strictly controlled, so there are no industrial application reports.

Another example is "a process for recovering valuable metals from waste lithium batteries" published by Chinese patent CN 102162034 A. Using pretreatment, leaching process, chemical impurity removal, extraction and separation and other process steps, the cobalt, copper, nickel , aluminum and other valuable metals, but the extraction and separation process requires expensive extractants and complicated operations. Although this process is close to the recovery process used in industrial production, it has the disadvantage of high recovery costs.

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