Method for completely recovering valuable components in waste lithium battery

Abstract

The invention discloses a method for completely recovering valuable components in a waste lithium battery. And carrying out electrified crushing on the disassembled single batteries under the protection of nitrogen atmosphere, and carrying out high-temperature pyrolysis in an anaerobic environment after crushing. Tail gas generated by high-temperature pyrolysis, electrolyte volatilization in the crushing process, metal dust generated by winnowing and acid mist generated by wet stripping are conveyed to an environment-friendly treatment system, and are discharged after being treated to reach the standard through the steps of secondary high-temperature combustion and the like. The pyrolyzed material passes through a multi-component screening and sorting system, and positive and negative pole pieces, a magnetic conductive shell and a pile head, and a non-magnetic shell and a pile head are sorted out. The sorted positive and negative pole pieces pass through a material wet stripping system, pole powder and copper-aluminum foil are separated, and copper and aluminum separation is achieved through color sorting. The recovery rate of the pole powder is 98% or above, the grade of the pole powder is high, copper and aluminum foil current collectors are recovered at the same time, metal shells and pile heads made of different materials are recovered in a classified mode, the recovery rate is high, the output value of the recovery process is increased, and the recovery process is environmentally friendly.

Description

technical field [0001] The invention belongs to the recycling and utilization of waste lithium batteries, in particular to a method for fully recycling valuable components in waste lithium batteries. Background technique [0002] According to statistics, among the top 10 companies with global power battery installed capacity in 2020, Chinese battery companies occupy 6 seats. China already has the world's largest new energy vehicle and power battery industry chain. The installed capacity of power batteries has been rising in recent years. Under the huge demand, the demand for upstream raw materials has increased significantly. Affected by the lack of resources, my country mainly relies on imported ore resources from abroad. and processed high-end products to meet domestic production and supply. According to statistics, the import dependence of nickel, cobalt, manganese, and lithium exceeds 70%, 80%, 60%, and 70% respectively. The recycling of waste lithium battery resources h...

AI Technical Summary

Problems solved by technology

However, this invention does not involve the recovery and treatment of the electrolyte solute lithium hexafluorophosphate. Low-temperature volatilization cannot remove the electrolyte, and harmful lithium hexafluorophosphate enters subsequent processes, seriously polluting the environment

Secondly, crushing the inner core will lead to a higher metal content in the electrode powder. If the material is too finely crushed, the accuracy of color selection will be affected. Finally, the battery shell and inner core must be manually disassembled and separated. The steps are cumbersome and are not conducive to industrial production.

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