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Pilot-scale studies of different covers on unoxidised sulphide-rich tailings in northern Sweden: the geochemistry of leachate waters
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7291-8505
2006 (Engelska)Ingår i: Mine Water and the Environment, ISSN 1025-9112, E-ISSN 1616-1068, Vol. 25, nr 3, s. 171-183Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Leachate water quality from covered and uncovered unoxidised sulphide-rich tailings in six pilot-scale (5x5x3 m3) test cells was monitored during 2004 and 2005. The covers consisted of a layer of clayey till, sewage sludge, apatite or Trisoplast (a commercial mixture of tailings, bentonite, and a polymer). All layers were protected by an unspecified till except in one reference cell, where the tailings were left open. All leachate waters showed near-neutral pH as a result of neutralization by calcite in the tailings and by Ca(OH)2 added prior to deposition. Average dissolved sulphur concentrations in the leachates were ≈ 600 mg L-1, except in the cell with sewage sludge (300 mg L-1). The source of sulphur was mainly pyrite oxidation, but residual sulphur probably remained from the enrichment process. The near-neutral pH favoured precipitation of metal-(oxy)hydroxides with subsequent removal of trace elements such as Cd, Cu and Pb (< 15 μg L-1) from the solutions. High concentrations of Co, Mn, Ni, and Zn were found in leachates from the apatite, Trisoplast, and uncovered tailings cells. High As concentrations were found in the leachates in the sewage sludge and clayey till cells. The lowest metal concentrations, redox potential, and highest pH were found in the sewage sludge cell. Decreased elemental metal concentrations during 2004 suggest improved performance over time.

Ort, förlag, år, upplaga, sidor
2006. Vol. 25, nr 3, s. 171-183
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-13250DOI: 10.1007/s10230-006-0129-zScopus ID: 2-s2.0-33748588696Lokalt ID: c70ed8e0-d70c-11db-8550-000ea68e967bOAI: oai:DiVA.org:ltu-13250DiVA, id: diva2:986202
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Validerad; 2006; 20070320 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2019-11-22Bibliografiskt granskad

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Alakangas, LenaÖhlander, Björn
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Mine Water and the Environment
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