公开(公告)号：US12119464B2

公开(公告)日：2024-10-15

申请号：US18507242

申请日：2023-11-13

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Dean Pan ,  Xiaoguang Zhang ,  Yifan Wang ,  Qijun Zhang ,  Wei Wang

IPC: H01M10/54 ,  C22B1/00 ,  C22B3/08 ,  C22B3/22 ,  C22B3/26 ,  C22B7/00 ,  C22B47/00

CPC classification number: H01M10/54 ,  C22B1/005 ,  C22B3/08 ,  C22B3/22 ,  C22B3/26 ,  C22B7/006 ,  C22B47/00

Abstract: The present invention provides a method for preferentially recovering manganese from waste lithium-rich manganese-based cathode material, the method comprising: step 1) calcination and leaching: mixing the waste lithium-rich manganese-based cathode material with ammonium sulfate and then performing low-temperature calcination, leaching the calcination product with water, and then performing solid-solution separation to obtain a leaching solution; step 2) complexing and manganese separating: adding ammonium sulfite to the leaching solution obtained in step 1) for a complex reaction to obtain manganese-rich residue; step 3) oxidation leaching: adding an oxidant to the manganese-rich residue obtained in step 2) to perform oxidation leaching, and adjusting the pH of the solution to obtain a manganese-rich solution; and step 4) extracting and stripping. The method realizes the preferential and productive recovering of manganese from waste lithium-rich manganese-based cathode materials, avoids the negative impact of polymetals in the conventional recovery process, and has economic and environmental benefits.