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dc.contributor.authorMäkitalo, Maria
dc.contributor.authorLu, Jinmei
dc.contributor.authorMaurice, Christian
dc.contributor.authorÖhlander, Björn
dc.date.accessioned2016-03-03T13:49:23Z
dc.date.available2016-03-03T13:49:23Z
dc.date.issued2015-10-08
dc.description.abstractOne of the mining industry's main concerns is the management of waste rock and tailings generated by sulfide ore extraction. Upon exposure of atmospheric oxygen, iron sulfides oxidize generating acidity. Infiltrating water form a metal-rich acidic leachate called acid mine drainage (AMD), that can cause serious environmental problems. Green liquor dregs (GLD) is a material that resists the passage of oxygen and water and could thus be used to seal mine wastes, preventing their oxidation and AMD formation. To enable its use in dry mine waste covers, the long-term efficiency of such GLD sealing layers must be evaluated. In this study, fresh GLD and GLD aged for 3 to 13 years was collected from two sites and analysed to determine how aging affects its chemical and physical properties. Aged and fresh GLD were very similar with respect to all the properties important in a sealing layer. In particular, there was no evidence of calcite dissolution in aged GLD samples. Aged GLD also exhibited high water saturation (>91%) and chemical stability, both of which are important for effective long-term sealing. The shear strength of GLD deployed in the field increased over time but not sufficiently to ensure the long-term physical integrity of a pure GLD sealing layer. The development of hybrid materials with improved shear strength will therefore be necessary.en_US
dc.descriptionAccepted manuscript version. Published version at <a href=http://dx.doi.org/10.1016/j.jece.2015.10.005>http://dx.doi.org/10.1016/j.jece.2015.10.005</a>. License in accordance with the journal's policy - <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/>CC-BY-NC-ND</a>.en_US
dc.identifier.citationJournal of Environmental Chemical Engineering 2015en_US
dc.identifier.cristinIDFRIDAID 1295325
dc.identifier.doihttp://dx.doi.org/10.1016/j.jece.2015.10.005
dc.identifier.issn2213-3437
dc.identifier.urihttps://hdl.handle.net/10037/8658
dc.identifier.urnURN:NBN:no-uit_munin_8183
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rights.accessRightsopenAccess
dc.subjectSulfidic mine wasteen_US
dc.subjectoxidationen_US
dc.subjectwater retention capacityen_US
dc.subjectdry coveren_US
dc.subjectremediationen_US
dc.subjectVDP::Technology: 500::Chemical engineering: 560::Chemical process engineering: 562en_US
dc.subjectVDP::Teknologi: 500::Kjemisk teknologi: 560::Kjemisk prosessteknologi: 562en_US
dc.titlePrediction of the long-term performance of green liquor dregs as a sealing layer to prevent the formation of acid mine drainageen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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