A method for recovering valuable metals from waste ternary lithium ion battery cathode materials

Abstract

The invention discloses a method for recycling valuable metals from a waste ternary lithium ion battery positive electrode material. The method comprises a fluidized reduction process, a cooling process, a water immersion and lithium extraction process, an evaporation and crystallization process, a conversion and manganese extraction process and a process of leaching through dilute acid. The method comprises the following steps: carrying out fluidized reduction on the waste ternary lithium ion battery positive electrode material to achieve transformation of phase and structure and obtain a reduced hot material; exchanging heat of the reduced hot material and cooling the reduced hot material, then feeding the reduced hot material into the water immersion and lithium extraction process, cooling and obtaining reduced powder, adding lithium in the reduced powder into an aqueous solution system, carrying out liquid-solid separation to obtain lithium extraction powder and a lithium hydroxidesolution, evaporating and crystallizing the solution to obtain lithium hydroxide; carrying out conversion and manganese extraction on the lithium extraction powder to obtain manganese hydroxide and manganese extraction powder, leaching the manganese extraction powder through dilute acid to obtain a leached solution containing nickel, cobalt and copper and hydrogen, returning hydrogen to the fluidized reduction process, and recycling nickel, cobalt and copper in the leached solution. The method has the advantages of short process, low energy consumption, environment friendliness and high addedvalues of products.

Description

technical field [0001] The invention belongs to the field of recovery of positive electrode materials of waste lithium ion batteries, in particular to a method for recovering valuable metals from positive electrode materials of waste ternary lithium ion batteries. Background technique [0002] Traditional fuel vehicles need to consume a lot of fossil fuels, and the vehicle exhaust generated contains solid suspended particles, carbon monoxide, nitrogen oxides, lead and sulfur oxides, which are harmful to human health and are also harmful to the environment in which people live. influences. In recent years, lithium-ion battery technology has made important breakthroughs, and new energy vehicles have entered a period of rapid development. my country has become the world's largest producer, consumer and exporter of lithium-ion batteries. It is estimated that the demand for power lithium-ion batteries will reach 125Gwh in 2020, and the amount of scrap will reach 2.2Gwh, about 50...

AI Technical Summary

Problems solved by technology

However, due to the use of solid reducing agents in this process, new impurities are easily introduced, and fixed-bed roasting has problems such as low mass and heat transfer efficiency, uneven reaction, and unfavorable large-scale industrial production.

[0004] To sum up, the existing waste ternary lithium-ion battery positive electrode material recovery technology has problems such as long process, complex system, and difficulty in lithium extraction. The fixed bed reduction lithium extraction process has low mass and heat transfer efficiency and uneven reaction. The solid reducing agent is easy to introduce impurities and other problems

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