公开(公告)号：US20210310100A1

公开(公告)日：2021-10-07

申请号：US17267481

申请日：2019-08-09

申请人： GRIREM ADVANCED MATERIALS CO., LTD.

发明人： Xiaowei HUANG ,  Zongyu FENG ,  Xu SUN ,  Yang XU ,  Meng WANG ,  Liangshi WANG ,  Chao XIA ,  Xiangsheng LIU ,  Longsheng ZHAO ,  Yongqi ZHANG

IPC分类号： C22B59/00 ,  C22B1/02 ,  C22B3/10

摘要： The present invention provides a process for metallurgy and separating a rare earth concentrate using a combination method, the process including: treating the rare earth concentrate containing bastnaesite by using a method including roasting under an atmosphere, leaching with hydrochloric acids, and roasting with a sulfuric acid, wherein stepping acid leaching with low-concentration hydrochloric acids is controlled during the leaching with the hydrochloric acids so as to obtain a rare earth solution with a high concentration (150-250 g/L REO), such that a leaching rate of Ce reaches 60% or more, and the content of F− in a leaching liquor is reduced by aging; and rare earth is further recovered from a leach residue by roasting with the sulfuric acid and leaching with water, and the total yield of the rare earth reaches 95% or more.