Decomposition and Leaching of Bastnasite by Sulfation and Recovery of Cerium Hydroxide from Leached Solution

황산화반응에 의한 불탄산염 희토류광(Bastnasite)의 분해, 침출 및 세륨수산화물의 회수

  • Yoon, Ho-Sung (Division of Minerals Utilization and Materials, Korea Institute of Geology, Minig & Materials) ;
  • Kim, Sung-Don (Division of Minerals Utilization and Materials, Korea Institute of Geology, Minig & Materials) ;
  • Kim, Chul-Joo (Division of Minerals Utilization and Materials, Korea Institute of Geology, Minig & Materials) ;
  • Kim, Jun-Soo (Division of Minerals Utilization and Materials, Korea Institute of Geology, Minig & Materials) ;
  • Han, Choon (Department of Chemical Engineering, Kwangwoon University)
  • 윤호성 (한국자원연구소 자원활용.소재연구부) ;
  • 김성돈 (한국자원연구소 자원활용.소재연구부) ;
  • 김철주 (한국자원연구소 자원활용.소재연구부) ;
  • 김준수 (한국자원연구소 자원활용.소재연구부) ;
  • 한춘 (광운대학교 화학공학과)
  • Received : 1998.01.19
  • Accepted : 1998.03.05
  • Published : 1998.06.10

Abstract

This study was carried out to investigate the optimum leaching conditions for the sulfation and water leaching, and separation of cerium from rare earth elements in leached solution by acid-adjusting method. The optimum conditions for the sulfation and water leaching from bastnasite concentrates are that the equivalent ration of sulfuric acid to concentrates is 2.5, calcination temperature and time are $600^{\circ}C$ and 2 hrs respectively, and the pulp density in the water leaching is 9.1%. The yield of rare earth oxide is about 93% at the above condition. The process of recovery of cerium hydroxide from leached solution by acid-adjusting method was carried out as following steps. The first step is the oxidation of the solution at pH 5 by using twice the equivalent of $H_2O_2$ solution as an oxidant. The second step is the precipitation to obtain cerium complex salt and cerium hydroxide after lowering the solution to pH 2. The last step is the oxidation-precipitation by using equivalent of $H_2O_2$ solution. From these results, it was possible to prepare cerium hydroxide with the yield of 60% and the quality of 80%.

Keywords

Acknowledgement

Supported by : 과학기술처

References

  1. Monats. Chemie v.124 Todorovsky D. S(et al.)
  2. Chem. Rev v.37 Moeller T;Kremer H. E
  3. 무기정량분석화학의 이론과 응용 이길상
  4. 산업기술정보원 조사연구보고서 회토류 금속의 제조와 응용 박홍식
  5. Rare Earth Element & Their Applications Yu Zongsen;Chen Minbo
  6. 稀土化學 제강
  7. J. Soc. Chem. Ind. v.76 Vickery R. C
  8. Special Review, Rare Earth Future Prospect Su Sqiang