Method for recovering valuable metals from positive electrode material of waste lithium ion battery

Abstract

The invention provides a simple, efficient and environment-friendly method for recovering valuable metals from a positive electrode material of a waste lithium ion battery; the method comprises the following steps of performing discharging of a salt solution; performing disassembling to separate a positive plate; performing smashing on the positive plate to separate a positive electrode material and an aluminum foil; performing mixed low-temperature roasting on the positive electrode material and a roasting agent ammonium sulfate and / or ammonium bisulfate; performing leaching on the roasted material and separating to obtain carbon and a lixivium; adding a precipitant into the lixivium, and regulating the pH value by using NH<3>-containing flue gas, performing deposition on other metals except Li, and carrying out solid-liquid separation; regulating the pH value of a filtrate by using the NH3-containing flue gas, adding ammonium carbonate or ammonium bicarbonate or pumping CO<2> gas, and carrying out lithium precipitation to obtain a lithium carbonate product. The preparation process is simple, the process conditions are mild, the time required by the process is short, a large amount of acid and alkali do not need to be consumed, and the cost is low; and in addition, recovery of the valuable metals and carbon from the positive electrode material can be effectively realized, themethod is green and environment-friendly, and a large amount of solid waste and wastewater cannot be generated.

Description

technical field [0001] The invention relates to the field of electronic solid waste treatment and recycling, and relates to a method for recovering valuable metals from waste lithium-ion battery cathode materials. Background technique [0002] Currently, due to LiNi x co y mn 1-x-y o 2 The battery positive electrode active material contains a large amount of important rare metal resources such as Li, Co, Ni, Mn, etc., so waste LiNi x co y mn 1-x-y o 2 The recycling of cathode active materials has attracted worldwide attention. LiCoO for the first generation of lithium-ion batteries 2 As an anode material, while recycling LiCoO 2 Extensive research has been conducted on spent Li-ion batteries as cathode materials. However, most of the widely used cathode materials for lithium-ion batteries are LiCoO 2 , LiMn 2 o 4 , LiNiO 2 、LiNi x mn y co 1-x-y o 2 , and LiFePO 4 Mainly. The price of cathode materials is the most expensive part of each component of lithiu...

AI Technical Summary

Problems solved by technology

The main disadvantage of this process is that the amount of ammonium sulfate required for roasting is large; and the recovery is difficult, so acid leaching is required in the future, which will increase the alkali consumption of the system

However, the whole process does not treat the roasting flue gas and the solid waste and wastewater obtained from subsequent treatment, which has great environmental risks.

[0006] In summary, traditional waste LiCoO 2 Lithium-ion battery recycling process consumes a lot of acid and alkali, and produces a lot of solid waste and wastewater, which will definitely bring serious environmental problems

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