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Pilot-scale studies of different covers on unoxidised sulphide-rich tailings, northern Sweden: oxygen diffusion
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2010 (English)In: Mine Water and the Environment: proceedings of the 10th IMWA Congress 2008 : 2-5 June, 2008 - Karlovy Vary, Czech Republic / [ed] Nadia Rapantova; Zbyněk Hrkal, Ostrava: VSB - Technical University Ostrava, Faculty of Mining and Geology, Institute of Environmental Engineering , 2010, p. 347-350Conference paper, Published paper (Refereed)
Abstract [en]

The efficiency of five cover systems to decrease oxygen intrusion into sulphide-rich tailings was studied in pilot-scale test cells (5x5x3 m(3)). The covers consisted of clayey till, sewage sludge, fine-grained apatite concentrate or Trisoplast (a mixture of a polymer, bentonite and tailings sand) as sealing layers and unspecified till as protective cover. In one reference cell, tailings were uncovered. Oxygen concentrations below the entire covers were highest below the Trisoplast and apatite layers, and lowest below the sewage sludge layer. Effective diffusion coefficients (D-eff) and oxygen fluxes were estimated in the covers with non-oxygen-consuming sealing layers (clayey till and apatite). For the protective covers the Deff ranged between E-09 and E-07 m(2)/s, and for the sealing layers between E-10 and E-09 m(2)/s, and for the entire covers between E-10 and E-08 m(2)/s. Seasonal variations in D-eff were larger within the covers than between the different cover systems. Oxygen fluxes through the entire covers with clayey till and apatite ranged between 0.2 and 4 mole m(2)/year, which was a reduction of more than 99% compared to uncovered dry tailings.

Place, publisher, year, edition, pages
Ostrava: VSB - Technical University Ostrava, Faculty of Mining and Geology, Institute of Environmental Engineering , 2010. p. 347-350
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-32308Local ID: 6c471f40-5c00-11df-ab16-000ea68e967bISBN: 978-80-248-1767-5 (print)OAI: oai:DiVA.org:ltu-32308DiVA, id: diva2:1005542
Conference
IMWA Congress : 02/06/2008 - 05/06/2008
Note
Godkänd; 2010; 20100510 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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CiteExportLink to record
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