Advancing the recovery of iron and rare earth elements from the solid waste at Bayan Obo  

作　　者：Na Zhao Qiang Zhang Hongwei Ma Yongsheng Sun Peng Gao Zhao Cao Zhenyue Zhang 

机构地区：[1]School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China [2]Mineral Processing Plant of Jinchuan Group Nickel Cobalt Co.,Ltd.,Jinchang 737100,China [3]School of Mining and Coal Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China [4]School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430074,China

出　　处：《International Journal of Mining Science and Technology》2025年第2期295-306,共12页矿业科学技术学报(英文版)

基　　金：supported by the National Key R&D Program of China(No.2021YFC2901000);the Key Program of National Natural Science Foundation of China(No.52130406);the Natural Science Foundation Innovation Group Project of Hubei Province(No.2023AFA044);the Fundamental Research Funds for the Central Universities(No.N2301002)。

摘　　要：The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental concerns.In this study,an efficient process was developed to recover iron and rare earth elements(REEs)from this waste by processes of hydrogen-based mineral phase transformation(HMPT),magnetic separation,and flotation.Under optimal HMPT conditions(525℃,12.5 min,and 30%H_(2)concentration),an iron concentrate with a TFe grade of 64.09%and a recovery of 95.33%was obtained.The magnetic properties of the solid waste were greatly enhanced by HMPT,allowing the effective magnetic separation of iron minerals.Further optimization of the flotation process resulted in a REEs concentrate with a rare earth oxide(REO)grade of 65%-70%and a REEs recovery of 60%-65%.Hematite was reduced to magnetite during HMPT,and bastnaesite was decomposed to REEs oxides and fluorides,and the particle structure was significantly destroyed.However,changes in monazite,fluorite,and barite were minimal.

关 键 词：Hydrogen-based mineral phase TRANSFORMATION FLOTATION Reduction characteristics Microstructure evolution Surface chemistry 

分 类 号：TF56[冶金工程—钢铁冶金] TF845[环境科学与工程—环境工程] X705