公开(公告)号：US20220371908A1

公开(公告)日：2022-11-24

申请号：US17816857

申请日：2022-08-02

Applicant: BAOTOU RESEARCH INSTITUTE OF RARE EARTHS

Inventor： Shengfeng Ma ,  Yanhui Xu ,  Yu Li ,  Weihua Guan ,  Kai Gao ,  Jing Song

IPC: C01F17/206 ,  C01F17/247

Abstract: The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with microwave and calcining at 500-1000° C. for 20-120 min to obtain a second rare earth oxide and carbon dioxide; (2) reacting carbon dioxide with a first ammonia water to obtain a precipitant; (3) reacting the precipitant with rare earth chloride to obtain a second rare earth carbonate and ammonium chloride wastewater. In the method, calcination time is short, rare earth recovery rate, utilization rate of ammonia and carbon resources are high. The present disclosure also provides a use of a rare earth oxide in shortening calcination time and/or increasing rare earth yield.