Recent process developments in beneficiation and metallurgy of rare earths:A review  

作　　者：Shaokai Cheng Wenbo Li Yuexin Han Yongsheng Sun Peng Gao Xiaolong Zhang 

机构地区：[1]School of Resources and Civil Engineering,Northeastern University,Shenyang,110819,China [2]National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang,110819,China

出　　处：《Journal of Rare Earths》2024年第4期629-642,共14页稀土学报（英文版）

基　　金：Project supported by the National Key R&D Program of China(2022YFC2905800,2021YFC2901000);the National Natural Science Foundation of China(52174242,52130406).

摘　　要：Rare earth elements(REEs)are irreplaceable materials supporting low-carbon technology and equip-ment,and their commercial demand and strategic position are becoming increasingly prominent.With the continuous depletion of rare earth(RE)resources,developing high-efficiency beneficiation and eco-friendly metallurgical processes has attracted widespread attention.This paper reviews the major minerals exploited for RE production and their deposits,as well as the beneficiation and metallurgical processes of RE minerals.Bastnaesite,monazite,mixed RE ores,and ion-adsorption clays are the main raw materials in the world to date.RE-bearing ores(except ion-adsorption minerals)are generally beneficiated by flotation,gravity and magnetic separation techniques.The mainstream metallurgical processes for bastnaesite,monazite and mixed RE concentrates are oxidation roasting-HCl leaching,caustic soda decomposition and high-temperature concentrated sulfuric acid roasting,respectively.Ion-adsorption clays are directly processed by in situ leaching-precipitation/solvent extraction.To achieve the sustainable development of RE resources,it is essential to further explore innovative techniques to achievecomprehensive utilization and cleaner production.

关 键 词：Rare earths Beneficiation processes Metallurgical processes Cleaner production 

分 类 号：TF845[冶金工程—有色金属冶金] TD955[矿业工程—选矿]