Abstract
Monazite is conventionally processed using caustic conversion and hydrochloric acid leaching in industry, to recover the rare earth elements (REE). Understanding the deportment of uranium decay chain radionuclides is of particular importance for product quality and occupational health and safety (OH&S) purposes. Here, the deportment of uranium decay chain radionuclides during the alkaline treatment route was investigated for the first time, using analytical techniques. Significant quantities of 226Ra, 210Pb and 227Ac were found to report to the rare earth chloride liquor. Subsequent impurity removal treatment generally resulted in the elimination of more than 85 % of radionuclides contained in the chloride liquor.
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References
Bashir VS (1988) Mater Sci Forum 30:33–44
Pillai, PMB (2007) In: Naturally Occurring Radioactive Material (NORM V), Proceedings of an International Symposium Seville, IAEA, Vienna, 19–22 March 2007. http://www-pub.iaea.org/MTCD/publications/PDF/Pub1326_web.pdf. Accessed 21 Mar 2014
Khan AH, Pillai PMB, Maniyan CG, Sujatha, R, Haridasan, PP (2001). Environmental surveillance during processing of monazite for extraction of thorium and rare earths compounds. Seminar on processing and applications of rare earths in India, Munnar. http://v.pl.4.eu-norm.org/index.pdf. Accessed 21 Mar 2014
Sethna HN, Fareeduddin, S (1957) Treatment of monazite sands with special reference to Indian practice, Symposium on Rare Metals
Pillai PMB, Khan AH (2003) Radiat Prot Environ 26:523–532
Paul AC, Pillai KC (1979) Bull Radiat Prot 2:52–56
Paul AC, Pillai KC, Soman, SD (1984) Occupational and environmental radiation exposures from monazite processing in India. 6th International Congress on Radiation-Risk-Protection, Berlin. http://www.irpa.net/irpa6/cdrom/VOL.1/B1_46.PDF. Accessed 21 Mar 2014
Pillai PMB, Haridasan PP, Maniyan CG, Sujata R, Khan AH, Puranik VD (2004) Environmental surveillance in mining, milling and processing of thorium mineral monazite–radiological aspects. National Symposium on Environment
IAEA (2011) Radiation protection and NORM residue management in the production of rare earths from thorium containing minerals, Safety Reports Series No. 68. IAEA, Vienna
Hewson GS (1993) Radiat Protect Environ Aust 11:60–66
Hart KP, Brown SA, Levins DM (1993) The behaviour of radionuclides in the processing of rare earth minerals. Rare Earths’93: Processing and Utilisation Workshop
IAEA (2006) Fundamental safety principles, IAEA Safety Standards Series No. SF–1. IAEA, Vienna
IAEA (1996) International Basic Safety Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources, Safety Series No. 115. IAEA, Vienna
IAEA (2005) Regulations for the Safe Transport of Radioactive Material, Safety Requirements No. TS–R–1. IAEA, Vienna
IAEA (2004) Occupational radiation protection in the mining and processing of raw materials, IAEA Safety Standards Series, RS–G–1.6. IAEA, Vienna
IAEA (2002) Management of Radioactive Waste from the Mining and Milling of Ores, IAEA Safety Standards Series, WS–G–1.2. IAEA, Vienna
AM-I-052-003 Preparation of powdered samples for gamma ray analysis
AM-I-052-002 Preparation of solution for gamma ray analysis
AM-I-052-004 Counting procedure using maestro
AM-I-005 Gamma spectrum analysis of solid samples using gammavision
AM-I-019-002 Radiochemical analysis for U, Th, Pb and Po
AM-I-026-004 Dissolution of solid samples for radiochemical analysis
OUI-6951-001 Operation of the delayed neutron activation analysis system
OUI-6951-004 Assembly of SRT outer can for DNAA
AM-I-050-collective procedures for NAA analysis
Katz JJ, Seaborg GT (1957) The chemistry of the actinide elements. Methuen and Co., Ltd., London
Acknowledgments
The authors would like to thank the following people for their assistance with this work: Brian Young and Kathryn Prince for providing SEM/QEMSCAN analysis, Chris Hilliard and Nicol Londono for assistance with sample preparation and Damian Conroy and Patrick Yee for providing ICP analysis.
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Anvia, M., Brown, S.A. & McOrist, G.D. The deportment of uranium decay chain radionuclides during processing of an Australian monazite concentrate using a caustic conversion route. J Radioanal Nucl Chem 303, 1393–1398 (2015). https://doi.org/10.1007/s10967-014-3483-5
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DOI: https://doi.org/10.1007/s10967-014-3483-5