The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2025
Filed:
Aug. 09, 2019
Grirem Advanced Materials Co., Ltd., Beijing, CN;
Xiaowei Huang, Beijing, CN;
Zongyu Feng, Beijing, CN;
Xu Sun, Beijing, CN;
Yang Xu, Beijing, CN;
Meng Wang, Beijing, CN;
Liangshi Wang, Beijing, CN;
Chao Xia, Beijing, CN;
Xiangsheng Liu, Beijing, CN;
Longsheng Zhao, Beijing, CN;
Yongqi Zhang, Beijing, CN;
GRIREM ADVANCED MATERIALS CO., LTD., Beijing, CN;
Abstract
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.