Method for recovering cobalt, nickel and manganese from waste lithium cells

Abstract

The invention discloses a method for recovering cobalt, nickel and manganese from waste lithium cells. Most of the conventional recovery methods can hardly guarantee the product quality. The technical scheme adopted by the invention is as follows: (1) the anode materials of waste lithium cells are immerged in low-concentration alkali solution, and because the anode materials do not react with the alkali solution, the anode materials shed from aluminum sheets to become black powder; (2) for the black powder, dilute sulfuric acid is first adopted for low-acid dissolution, Na2SO5 or Na2SO3 or Fe powder added with concentrated sulfuric acid is then adopted for reduction and dissolution, and finally, 3 to 6mol / L of sulfuric acid is adopted for high-acid dissolution; (3) solid-liquid separation is carried out on the substance obtained in step 2; (4) reagent is adopted for precipitating and deeply removing alkaline earth impurities. The method has the advantages of simple operation, low auxiliary material consumption, high product purity, high metal yield and no environment pollution, and is an ideal method for recovering cobalt, nickel and manganese from waste lithium cells.

Description

technical field [0001] The invention relates to a method for separating and recovering lithium batteries, in particular to a method for recovering cobalt, nickel and manganese from waste lithium ion battery cathode materials. Background technique [0002] Since the commercialization of lithium-ion batteries around 1990, due to the advantages of small size, light weight, fast charging speed, wide temperature range and long cycle life, they have been widely used in cameras, mobile phones, notebook computers, portable measuring instruments, etc. etc., it is also the preferred high-energy power source for future electric vehicles. At present, the positive electrode material of lithium-ion batteries is composed of pure aluminum foil (0.01 mm in thickness) as a current collector and a black positive electrode active material coating (about 0.08 mm in thickness). The black coating contains about 88% of the positive electrode material lithium cobaltate or modified lithium cobaltate...

AI Technical Summary

Problems solved by technology

This method adopts multi-stage leaching, the raffinate is returned to leaching to enrich nickel, and the slag roasted deacetylene black is returned to leaching. Although cobalt and lithium can be recovered, the process is long, the process is complicated, and the operation is very inconvenient.

[0006] Chinese Patent Application No. 200810028730.7 discloses "a method for recovering and preparing lithium cobaltate from waste lithium-ion batteries". Aluminum removal is not complete, it is difficult or impossible to guarantee the product quality, the actual production can only be used as an intermediate raw material for cobalt extraction

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