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Geotechnical and chemical characterization of field-applied fly ash as sealing material over mine tailings
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden; Department of Environment and Mineral Resources, Greenland Institute of Natural Resources, Nuuk, Greenland.
Örebro University, School of Science and Technology. Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden.
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden; Ramböll Sverige AB, Luleå, Sweden.
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden.
2019 (English)In: International Journal of Environmental Science and Technology, ISSN 1735-1472, E-ISSN 1735-2630, Vol. 16, no 3, p. 1701-1710Article in journal (Refereed) Published
Abstract [en]

The present study addresses the geotechnical and chemical properties of sealing materials using a paper mill by-product, fly ash, on top of sulfide-bearing mine waste tailings after 5years of field application. From a geotechnical perspective, the low in situ bulk density (1500kg/m(3)) ensured a high degree of water saturation (90.2%) for the field-applied ash. The chemical characteristics and behaviors of the fly ash samples reflected a high long-term leaching capacity (liquid-to-solid ratio of 10cm(3)/g) and high alkalinity (liquid-to-solid ratio of up to 500cm(3)/g). The laboratory leaching results suggested that none of the elements released from the field-applied ash exceeded the EU limits for inert materials, and the concentrations of elements were far below the limits for hazardous materials at landfill sites. Based on the in situ and laboratory characterizations of the field-applied ash, the fly ash sealing material was considered geotechnically stable. However, a number of geotechnical parameters could not be measured due to the cementation of the ash. Moreover, the chemical composition of the field-applied ash exhibited considerable variations when compared with that of the raw ash generated from the same paper mill. Overall, the field-applied ash displayed high alkalinity and effectively buffered the acid generated from sulfidic tailings for long-term sealing purposes.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 16, no 3, p. 1701-1710
Keywords [en]
Alkalinity, Dry cover, Leaching capacity, Paper mill by-products
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:oru:diva-73331DOI: 10.1007/s13762-018-1738-3ISI: 000460696700041Scopus ID: 2-s2.0-85047210163OAI: oai:DiVA.org:oru-73331DiVA, id: diva2:1299248
Funder
Swedish Research Council Formas, 2011-268-19774-35
Note

Funding Agencies:

European Union Structural Funds  

Northern Sweden Soil Remediation Center, EDF Objective 2, Contract MCN IO  43173 

Sveriges Ingenjor Environmental Fund  

Center of Advanced Mining and Metallurgy (CAMM)  

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-26Bibliographically approved

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Stahre, Nanna

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