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- Title
Reactive transport of U and V from abandoned mine waste sites.
- Authors
AVASARALA, SUMANT
- Abstract
In this study, we investigate the reactive transport of uranium (U) and vanadium (V) from abandoned mine wastes collected from Blue Gap/Tachee, AZ by integrating flow through column experiments, reactive transport modelling (PFLOTRAN), and electron microscopy. Transmission electron microscopy (TEM) integrated with selected area electron diffraction (SAED) and electron dispersive spectroscopy (EDS) was used to identify amorphous and crystalline U-V phases in unreacted mine waste sediments. The sediments were sequentially reacted with 18MO water (pH 5.4), 10mM HCO3Ω (pH 7.9) and 10mM CH2COOH (pH 3.4) to simulate relevant oxidizing conditions encountered at the Blue Gap/Tachee mine site and investigate the reactive transport of U and V. Reactive transport simulations of mine wastes reaction with 10mM HCO3Ω and CH3COOH suggest dissolution of U-V bearing mineral phases as a key process controlling transport of U and V, attributing difference in their release to different U and V phases, possibly to the identified multi-crystalline U-V phases. Therefore, this study provides insights of interfacial processes affecting the transport U and V in water resources adjacent to mine wastes.
- Subjects
URANIUM mine waste; VANADIUM mines &; mining; ELECTRON microscopy; TRANSMISSION electron microscopy; URANIUM transportation; DISSOLUTION (Chemistry)
- Publication
New Mexico Journal of Science, 2016, Vol 50, Issue 1, p59
- ISSN
0270-3017
- Publication type
Article