Resource recycling technology for waste lithium ion batteries

Abstract

The invention discloses a resource recycling technology for waste lithium ion batteries. The technology comprises the following steps of putting the waste lithium ion batteries into brine for electric discharging, draining, smashing, oxidizing and burning the waste lithium ion batteries in a rotary kiln for 40 minutes at 800 DEG C, and adding ammonium sulfate for roasting at 400 DEG C according to a fixed proportion, wherein the proportion of the raw material to the ammonium sulfate is 1:2.5; separating out all metallic elements by the form of sulfate, then dissolving and filtering the metallic elements with hydrochloric acid, putting P507 extraction system comprising the hydrochloric acid, kerosene and phosphate into a filtrate pump for fractional extraction, sequentially separating all metallic elements out by regulating the concentration of the hydrochloric acid, adding ammonium bicarbonate for precipitating, filtrating and firing so as to prepare all metallic oxides, and finally preparing corresponding metallic elements through point solution or reduction according to the properties of all metallic elements, so as to realize resource recycling of the waste lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of waste resource utilization, and more specifically relates to a waste lithium ion battery resource recovery technology. Background technique [0002] With the development of communication technology and electronic technology, the production and consumption of lithium-ion batteries have increased rapidly, resulting in a large number of waste lithium-ion batteries. Lithium-ion batteries with LiCoO2 as the positive electrode material contain lithium cobaltate, lithium hexafluorophosphate, organic carbonate, Substances such as polyethylene, carbon materials, copper foil, and aluminum foil generally contain more metals such as lithium, cobalt, copper, and nickel, and have recycling value. Generally, hydrochloric acid is used in the precipitation process of recovery. While cobalt, lithium and other metal elements are leached, HCl is highly corrosive and volatile, and chlorine gas will be generated, which needs ...

AI Technical Summary

Problems solved by technology

Generally, hydrochloric acid is used for precipitation in the precipitation process of general recovery. While leaching metal elements such as cobalt and lithium, HCl is highly corrosive and volatile, and chlorine gas will also be generated, so it needs to be carried out in a closed container.