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Role of carbonates in mitigation of metal release from mining waste: evidence from humidity cells tests
Luleå University of Technology.
Luleå University of Technology.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
1999 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 37, no 4, p. 267-280Article in journal (Refereed) Published
Abstract [en]

Leaching of two contrasting types of sulphidic tailings in humidity cells has been performed. The release of heavy metals and the oxidation rate have been studied. Tailings from the Laver mine contain a few percent sulphides and lack carbonates, whereas tailings from the Stekenjokk mine are both sulphide- and carbonate-rich. The results showed that in the leachates from the Laver samples, the metal concentrations increased and pH decreased with time, indicating an increased oxidation rate. In the Stekenjokk samples, pH remained high during the experiment, thereby keeping the metal concentrations low in the leachates. The oxidation rate also decreased with time, probably due to Fe-hydroxide coatings on sulphide surfaces. The results show that addition of carbonates and the maintenance of a high pH not only reduce the solubility of heavy metals, but also decrease the oxidation rate of sulphides.

Place, publisher, year, edition, pages
1999. Vol. 37, no 4, p. 267-280
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-14605DOI: 10.1007/s002540050384Scopus ID: 2-s2.0-0032921935Local ID: e00e2fd0-dd06-11db-9cae-000ea68e967bOAI: oai:DiVA.org:ltu-14605DiVA, id: diva2:987578
Note
Godkänd; 1999; 20070328 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Öhlander, Björn

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