公开(公告)号：US11332380B2

公开(公告)日：2022-05-17

申请号：US16820982

申请日：2020-03-17

Applicant: Kunming University of Science and Technology

Inventor： Ping Ning ,  Senlin Tian ,  Jianhong Huang ,  Yunjian Chen ,  Xuewei Hu ,  Yingjie Li

IPC: B01D53/50 ,  B01D53/80 ,  C01F7/06 ,  C01G49/06 ,  C22B3/06 ,  C22B3/22 ,  C22B21/00 ,  C01F7/066 ,  C01F7/0646

Abstract: The present invention discloses a method for aluminum-enhanced dealkalization of red mud and separation and recovery of aluminum and iron. The method includes: dissolving red mud in water, introducing excessive SO2, introducing O2 for aeration, and refluxing part of alkaline leachate after filtering; when pH of a red mud mixture decreases to below 3, washing and filtering the red mud mixture, adding NaOH to acidic leachate to adjust its pH to a strongly alkaline level, aging and filtering the leachate, treating filter residue to recover Fe2O3, and refluxing part of alkaline leachate after filtering to the red mud mixture; and adjusting pH of the remaining alkaline leachate after filtering to a weakly acidic level, and conducting filtering to recover aluminum.