Method for completely recovering valuable metal components of waste lithium battery by stripping pole powder by hydrodynamic separation wet method

Abstract

The invention discloses a method for completely recovering valuable metal components of a waste lithium battery by stripping pole powder by a hydrodynamic separation wet method. According to the invention, the disassembled waste lithium battery is directly crushed in an electrified manner and then is subjected to high-temperature pyrolysis in an anaerobic environment, and waste gas generated in the process is discharged after reaching the standard through secondary combustion and the like; performing hydrodynamic separation on the pyrolyzed material to separate a shell, a pile head, pole powder and positive and negative pole pieces; and performing wet stripping on the positive and negative pole pieces to strip residual pole powder, drying and granulating the separated copper-aluminum foil, performing color sorting, and separating out copper and aluminum particles. And combining the stripped residual pole powder with the pole powder obtained by cleaning the shell and the pile head, the pole powder obtained by hydrodynamic separation and the pole powder obtained by washing and screening the pole piece, filtering, dehydrating and drying to obtain positive and negative pole powder products, and further separating the shell and the pile head through magnetic separation and eddy current separation. The recovery rate of the polar powder reaches 98% or above, the grade of the polar powder is high, the recovery rate of copper and aluminum foil is also high, metal shells and pile heads made of different materials can be recovered in a classified mode, and the recovery and utilization output value is increased.

Description

technical field [0001] The invention belongs to the recycling and utilization of waste lithium batteries, and in particular relates to a method for fully recovering valuable metal components of waste lithium batteries obtained by hydrodynamic separation and wet stripping of pole powder. Background technique [0002] The materials with the most recycling value in used lithium batteries are positive and negative electrode powder, copper foil, and aluminum foil, followed by aluminum shells, copper-aluminum pile heads, and nickel strips and copper strips for welding the positive and negative ends of the winding core. The most harmful substances to the environment are organic electrolytes and electrolytes, followed by fluorine-containing binders in active materials. [0003] At present, the traditional method of recycling waste lithium batteries generally adopts multi-stage crushing, fine crushing or even grinding methods; the separation of shell pile heads, pole pieces, and pole...

AI Technical Summary

Problems solved by technology

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

Secondly, the crushing of 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 the inner core must be manually disassembled and separated. The steps are cumbersome, which is not conducive to industrial production.

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