Method for recovering and extracting cobalt, copper, aluminum and lithium four metal elements in waste lithium-ion batteries by using liquid phase reaction

Abstract

The invention discloses a method for recovering and extracting four metal elements including cobalt, copper, aluminum and lithium in a waste lithium ion battery by using liquid phase reaction. The method comprises the following steps: (1), dispersing 1-1000 g of mechanically crushed waste battery powder in a sodium hydroxide solution, after completely dissolving a dissoluble part in the battery powder, separating plastic powder and carbon powder from an upper layer of the solution and separating electrode powder in a lower layer of the solution by using a cyclone separation method, and obtaining copper powder from a filter net at a middle layer of the solution; (2), obtaining aluminum hydroxide sediment; (3), obtaining lithium carbonate sediment; and (4), obtaining cobalt oxalate. According to the method, the separation of cobalt, copper, aluminum and lithium is realized, aluminum hydroxide, cobalt oxalate and lithium carbonate prepared by using the method are uniform and consistent, and high in degree of crystallinity; and aluminum hydroxide, copper powder, cobalt oxalate and lithium carbonate are obtained, therefore, recycling of a battery material is realized, the cost is low, and the method is suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a method for recovering and extracting four metal elements of cobalt, copper, aluminum and lithium in waste lithium-ion batteries by using liquid phase reaction, which is suitable for aluminum-shell lithium-ion batteries with lithium cobaltate as the positive electrode and graphite as the negative electrode. Background technique [0002] In recent years, with the continuous improvement of people's awareness of environmental protection and the continuous consumption of natural resources, lithium-ion batteries have been developed to replace traditional high-pollution lead-acid batteries and nickel-cadmium batteries, and are widely used in notebook computers and mobile phones. , electric tools, communication base stations, electric vehicles. Compared with traditional rechargeable batteries, lithium-ion batteries have the advantages of high working voltage, small size, light weight, high specific energy, low pollution, and long cyc...

AI Technical Summary

Problems solved by technology

However, the current wet treatment has been widely promoted due to problems such as complex process, low resource recovery rate and serious secondary pollution.