Abstract
Knowledge of the behavior of technologically enhanced naturally occurring radioactive materials derived through the decay of U and its daughter products, and their subsequent fractionation, mobilization and retention, is essential to develop effective mitigation strategies and long-term radiological risk prediction. In the present study, multiple state-of-the-art, spatially resolved micro-analytical characterization techniques were combined to systematically track the liberation and migration of radionuclides (RN) from U-bearing phases in an Olympic Dam Cu flotation concentrate following sulfuric-acid-leach processing. The results highlighted the progressive dissolution of U-bearing minerals (mainly uraninite) leading to the release, disequilibrium and ultimately upgrade of daughter RN from the parent U. This occurred in conjunction with primary Cu-Fe-sulfide minerals undergoing coupled-dissolution reprecipitation to the porous secondary Cu-mineral, covellite. The budget of RN remaining in the leached concentrate was split between RN still hosted in the original U-bearing minerals, and RN that were mobilized and subsequently sorbed/precipitated onto porous covellite and auxiliary gangue mineral phases (e.g. barite). Further gri...Continue Reading
References
May 20, 2000·Chemosphere·Y G Zhu, G Shaw
Sep 30, 2008·Journal of Environmental Radioactivity·Qin-Hong HuJin-Sheng Wang
Dec 9, 2010·Chimia·Joël BruggerAllan Pring
Feb 22, 2012·PloS One·Philipp GormannsClaude Lechene
Jun 30, 2012·Nature Methods·Johannes SchindelinAlbert Cardona
May 23, 2014·Environmental Science & Technology·Martina KlinkenbergDirk Bosbach
Sep 10, 2014·Journal of Hazardous Materials·Scott A McMasterSuresh K Bhargava
Jun 9, 2016·Environmental Science & Technology·Pihong ZhaoAnnie B Kersting
Sep 12, 2017·Nature Geoscience·Oliver PlümperBjørn Jamtveit
Aug 20, 2018·Journal of Hazardous Materials·Scott A McMasterMark I Pownceby
Nov 27, 2018·Journal of Environmental Radioactivity·Christopher A G KalninsDavid Ottaway
Jul 8, 2019·Journal of Hazardous Materials·Rahul RamJoël Brugger
Nov 21, 2019·Scientific Reports·Haylea NisbetRobert Roback
Jun 6, 2020·Environmental Science & Technology·Zoltan SzaboCharles A Cravotta
Aug 29, 2020·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Qiangqiang ZhongJinzhou Du