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International journal of mineral processing v.159, 2017년, pp.7 - 15   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Hydrometallurgical digestion and leaching of Iranian monazite concentrate containing rare earth elements Th, Ce, La and Nd

Sadri, Farzaneh (School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, PO Box 11155/4563, Tehran, Iran ) ; Rashchi, Fereshteh (School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, PO Box 11155/4563, Tehran, Iran ) ; Amini, Ahmad (Geological Survey of Iran, Tehran, Iran ) ;
  • 초록  

    Abstract Rare earth elements (REEs) have an ever-increasing variety of applications in modern technology. In the present work, the possibility of extraction of rare earth elements cerium (Ce), lanthanum (La), neodymium (Nd) and thorium (Th) from a monazite concentrate containing 25% rare earth elements' oxide was investigated. In this regard, the acidic digestion and leaching step, and their effective parameters were studied in detail using design of experiment (DOE) which hadn't been investigated before. The optimum conditions for the performed experiments in acidic digestion step were: temperature of 225°C , time of 3.5h and sulfuric acid to concentrate weight ratio (L/S) of 2.5. Using these conditions, the recovery of 92.34%, 91.44%, 92.1% and 88.94% were obtained for cerium, lanthanum, neodymium and thorium, respectively. In leaching step, the optimum conditions were: temperature of 75°C, time of 15h and water to digested mass weight ratio of 7.5. Using these conditions, recovery of 88.47%, 89.45%, 87.35% and 82.19% were obtained for rare earth elements cerium, lanthanum, neodymium and thorium, respectively. In precipitation step, rare earths' oxalates were precipitated from the leach liquor using oxalic acid. Then, the precipitate was calcined in a furnace at 800°C for 1h and finally, a mixture of rare earth elements' oxides with a purity of about 84% was obtained.


  • 주제어

    Monazite .   Rare earth elements (REEs) .   Digestion .   Design of experiment.  

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