Incongruent weathering of Cd and Zn from mine tailings
Kossoff, David and Hudson-Edwards, Karen A. and Dubbin, W.E. and Alfredsson, M.A. (2008) Incongruent weathering of Cd and Zn from mine tailings. Mineralogical Magazine 72 (1), pp. 81-84. ISSN 0026-461X.
Weathering of discharged mine tailings contaminates streams, rivers and floodplains with toxic metals on a vast scale. The magnitude of the problem depends on input tailings mineralogy, storage and dispersal, and climatic conditions. To better understand the mechanisms of long-term tailings weathering, a leaching column study was established, incorporating tailings and soil from Potosí, Bolivia, with the aim of modelling a 25 year field period. The Zn/Cd molar ratio of the tailings leachate water, initially 738 for the unaltered tailings, is highly variable over 15 model years of leaching, particularly in the mixed tailings-soil columns. Columns with soil have ratios as high as 2563, while pure tailings columns reach ratios of <376. We employ complementary techniques, involving atomistic computational modelling, leachate analysis and mineralogical characterization, to elucidate the mechanisms governing these incongruent Cd and Zn weathering dynamics.
|School:||Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences|
|Date Deposited:||09 Feb 2011 10:40|
|Last Modified:||11 Oct 2016 11:58|
Additional statistics are available via IRStats2.