Recycling method for valuable metals in waste nickel-cobalt-manganese ternary lithium ion batteries

Abstract

The invention discloses a recycling method for valuable metals in waste nickel-cobalt-manganese ternary lithium ion batteries. The method comprises the steps that cathode materials are dissolved by adding alkali, and separating is performed to obtain a dissolved solution I and undissolved substances; acidolysis is performed on the undissolved substances to obtain a dissolved solution II, the pH value is adjusted to be alkaline, precipitation is formed, and filtrate I and a precipitate I are obtained; acidolysis is performed on the precipitate I to obtain a dissolved solution III, ammonium hydroxide is added into the dissolved solution III for complexing, after the pH value is adjusted to be alkaline, soluble carbonate is added, and filtering is performed to obtain filtrate II and a precipitate II; soluble carbonate is added into the filtrate II, and heating is performed to obtain a precipitate III; after acidolysis is performed, the pH value is adjusted to be 3.0-3.5, pypocholoride is added to adjust the pH value to be 2.0-3.0, and filtering is performed to obtain filtrate III and a precipitate IV. Accordingly, multiple valuable metals in the waste lithium ion batteries are recycled without adopting any extraction agent and other organic solvent, and the recycling method is high in recycling efficiency, little in pollution, low in cost and suitable for industrialized popularization.

Description

Technical field

[0001] The invention relates to the technical field of waste lithium ion battery recovery, in particular to a method for recovering valuable metals in waste nickel cobalt manganese ternary lithium ion batteries. Background technique

[0002] As the application range of lithium-ion batteries has become more extensive, the demand for related materials in the entire industry has also increased, especially for metals such as lithium and cobalt. Lithium-ion batteries contain heavy metal elements such as cobalt, nickel, manganese, and copper, and their deposition in the environment will inevitably bring adverse effects on the environment. At the same time, lithium-ion batteries contain toxic electrolytes. If they are scattered in the environment, they will It finally enters the human body through the food chain, which is harmful to human health. Although the life of lithium-ion batteries can reach hundreds or even thousands of times, with the rapid development of lithi...