Method for recovering cobalt, copper and iron from waste cobalt-containing lithium ion battery

Abstract

The invention discloses a method for recovering cobalt, copper and iron from a waste cobalt-containing lithium ion battery, and belongs to the technical field of metallurgy. According to the method, by utilizing sensible heat of converter copper slag, an existing slag system and high-temperature reduction characteristics of a negative electrode carbon material and an aluminum foil current carrierin the waste cobalt-containing lithium ion battery, self-reduction smelting is realized, the content of magnetic iron in the slag is reduced, the viscosity of the slag is reduced, oxidized copper in the slag and cobalt oxide serving as a battery pyrolysis product are reduced, self-reduction smelting combining copper slag depletion and waste lithium ion battery recycling is achieved, copper-cobalt-iron alloy is obtained, and low-copper-content depleted slag is produced. The method is easy to implement and high in adaptability, a slag system with the property similar to that of the copper slag can be treated according to needs, and Cu, Co, Fe and other metal elements can be comprehensively recycled conveniently.

Description

technical field [0001] The invention relates to a method for recovering cobalt-copper-iron from waste cobalt-containing lithium ion batteries, which belongs to the technical field of metallurgy. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in many fields such as power tools, electric vehicles / automobiles, military equipment, aerospace, etc. with excellent comprehensive performance. According to their application scenarios, they can be divided into three types: power, consumption and energy storage. With the development of lithium-ion batteries, its application is becoming more and more extensive, and the price of main components such as cobalt and lithium in batteries is constantly rising, making its cost a major factor hindering the expansion into the application field of renewable resources. The harmless treatment of waste lithium-ion batteries and the recycling of valuable components in batteries need to be valued ...

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Problems solved by technology

According to statistics, my country has stored more than 120 million tons of copper slag, and more than 10 million tons of copper slag are added every year. Such a huge amount of slag occupies land, pollutes the environment, and brings a heavy burden to the development and progress of human society.

[0006] Converter copper slag has the characteristics of high heat, high copper content in slag, and high magnetic iron content. It is often necessary to add a reducing agent to deplete or recover copper in the slag by slow cooling. The process of the former is simple, and the hot slag can be directly Utilization, but the copper content in the tailings is often as high as 0.5%-1.0%, and the copper recovery rate is low; the latter has a large investment in infrastructure, a complicated process, the slag needs to be cooled slowly, the heat is difficult to use, and metals such as Ni and Co in the slag cannot be recovered. element

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