Method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process

US9752213B2 · kind B2 · utility

Assignee

• GRIREM ADVANCED MATERIALS CO., LTD. · CN

Inventors

• Liangshi Wang · Beijing, CN
• Zhiqi Long · Beijing, CN
• Dali Cui · Beijing, CN
• Xiaowei Huang · Hunan, CN
• Ying Yu · Beijing, CN
• Yang Xu · Wenhe, CN
• Xingliang Feng · Beijing, CN

Key dates

• Filing date: Sep 29, 2013
• Grant date: Sep 5, 2017
• Expiry date: Dec 3, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process. The method comprises: oxidation roasting a bastnaesite, and leaching a roasted mixture using a hydrochloric acid, adding a roasting promoter to the bastnaesite during the roasting process; and/or during the leaching process using the hydrochloric acid, adding a catalytic leaching promoter into the mixture, obtaining a rare earth chloride solution containing little cerium element and a cerium-rich residue containing the fluorine element; and separating and recovering rare earth fluorides from the cerium-rich residue.