Abstract
Uranium ores at the McClean Lake Operation in the Athabasca Basin of Northern Saskatchewan can produce elevated levels of arsenic (up to 700 mg/L) and nickel (up to 500 mg/L) in acidic (pH<1.5) spent leaching solutions (raffinates). Prior to neutralization, if necessary, ferric sulfate is added to tailings slurries to increase their Fe/As (molar) ratio to greater than 3. The slurries are then neutralized with lime to pH 4, and subsequently to pH 7–8. After neutralization, As and Ni concentrations average less than 1 mg/L. Solids from bench scale experiments demonstrate that As is associated primarily with scorodite and annabergite, with small amounts adsorbed onto or co-precipitated with ferrihydrite.
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© 2006 Springer-Verlag Berlin Heidelberg
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Mahoney, J., Langmuir, D., Slaughter, M., Rowson, J. (2006). Raffinate Neutralization Experiments at the McClean Lake Mill — Removal of Arsenic and Nickel. In: Merkel, B.J., Hasche-Berger, A. (eds) Uranium in the Environment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28367-6_23
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DOI: https://doi.org/10.1007/3-540-28367-6_23
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-28363-8
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