Patent ID: 11920213
Assignee: HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 0:
1. A method for recycling a battery by incomplete extraction, characterized by comprising:
(1) subjecting waste batteries to discharging, crushing, and pyrolysis to obtain a waste battery powder;
(2) introducing a pretreatment gas into a device loaded with the waste battery powder, and bringing a gas outlet of the device into communication with absorption liquid A and absorption liquid B in order;
(3) performing the following operations on the device loaded with the waste battery powder: raising the temperature and continuing to introduce the pretreatment gas; reducing the temperature and introducing a reaction gas; raising the temperature, introducing the reaction gas, and then introducing the pretreatment gas; and reducing the temperature, and turning off the pretreatment gas;
(4) adding a first extractant to absorption liquid A, mixing the mixture, carrying out liquid separation, taking organic phase A, adding a first stripping agent for liquid separation, and taking aqueous phase A; and
(5) adjusting the pH of aqueous phase A to acidity, then adding a second extractant for liquid separation, taking organic phase B, adding a second stripping agent for liquid separation to obtain a stock solution enriched in Li, Mn, Ni and Co;
wherein the pretreatment gas is at least one of nitrogen, helium, argon or neon; the reaction gas is one of chlorine gas, fluorine gas or bromine gas; absorption liquid A is an acid solution, the acid solution is HCl; and absorption liquid B is an alkaline solution, the alkaline solution is a NaOH or KOH solution; wherein, in step (4), the first extractant is [(CH3)3C(CH2)5CH(CH3)CH2]HPO2 and the first stripping agent is diethylenetriamine pentaacetic acid; in step (5), the second extractant is [CH3(CH2)4CH(CH3)CH2]2HPO2 and the second stripping agent is triethylenetetraamine hexaacetic acid.