title: Radionuclide release from simulated waste material after biogeochemical leaching of uraniferous mineral samples.
abstract: Biogeochemical mineral dissolution is a promising method for the released of metals in low-grade host mineralization that contain sulphidic minerals. The application of biogeochemical mineral dissolution to engineered leach heap piles in the Elliot Lake region may be considered as a promising passive technology for the economic recovery of low grade Uranium-bearing ores. In the current investigation, the decrease of radiological activity of uraniferous mineral material after biogeochemical mineral dissolution is quantified by gamma spectroscopy and compared to the results from digestion/ICP-MS analysis of the ore materials to determine if gamma spectroscopy is a simple, viable alternative quantification method for heavy nuclides. The potential release of Uranium (U) and Radium-226 ((226)Ra) to the aqueous environment from samples that have been treated to represent various stages of leaching and passive closure processes are assessed. Dissolution of U from the solid phase has occurred during biogeochemical mineral dissolution in the presence of Acidithiobacillus ferrooxidans, with gamma spectroscopy indicating an 84% decrease in Uranium-235 ((235)U) content, a value in accordance with the data obtained by dissolution chemistry. Gamma spectroscopy data indicate that only 30% of the (226)Ra was removed during the biogeochemical mineral dissolution. Chemical inhibition and passivation treatments of waste materials following the biogeochemical mineral dissolution offer greater protection against residual U and (226)Ra leaching. Pacified samples resist the release of (226)Ra contained in the mineral phase and may offer more protection to the aqueous environment for the long term, compared to untreated or inhibited residues, and should be taken into account for future decommissioning.
authors.affiliation: Dept. of Chemistry & Biochemistry, Laurentian University, 935 Ramsey Lake Rd., Sudbury, ON, Canada P3E 2C6; MIRARCO, Laurentian University, 935 Ramsey Lake Rd., Sudbury, ON, Canada P3E 2C6. Electronic address: al_williamson@laurentian.ca.
authors.forename: Aimee Lynn
authors.initials: AL
authors.lastname: Williamson
authors.affiliation: Dept. of Chemistry & Biochemistry, Laurentian University, 935 Ramsey Lake Rd., Sudbury, ON, Canada P3E 2C6. Electronic address: fcaron@laurentian.ca.
authors.forename: François
authors.initials: F
authors.lastname: Caron
authors.affiliation: Dept. of Chemistry & Biochemistry, Laurentian University, 935 Ramsey Lake Rd., Sudbury, ON, Canada P3E 2C6. Electronic address: gspiers@laurentian.ca.
authors.forename: Graeme
authors.initials: G
authors.lastname: Spiers
mesh_terms: D042763:Acidithiobacillus / Q000378:metabolism*; D001673:Biodegradation, Environmental; D013058:Mass Spectrometry / Q000379:methods*; D011883:Radium / Q000378:metabolism*; D013051:Spectrometry, Gamma / Q000379:methods*; D014501:Uranium / Q000378:metabolism*; D014875:Water Pollutants, Radioactive / Q000378:metabolism*
chemical_list: D014875:Water Pollutants, Radioactive; D014501:Uranium; D011883:Radium
keywords: (226)Ra; (235)U; Bioleaching; Remediation; Uranium; Waste