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Estimation of temporal changes in oxidation rates of sulphides in copper mine tailings at Laver, Northern Sweden
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7291-8505
2010 (Engelska)Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 408, nr 6, s. 1386-1302Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Tailings containing pyrrhotite were deposited in an impoundment at a copper mine at Laver, Northern Sweden, which operated between 1936 and 1946. Since then the oxidation of sulphides has acidified recipient water courses and contaminated them with metals. Measurements from surface water sampled in 1993, 2001 and 2004-05 from a brook into which the tailing impoundment drains indicate that the amounts of sulphide-associated elements such as Cu, S and Zn released into the brook have decreased over time, while pH has increased. The mass transport of S in the brook during 1993 and 2001 corresponded well with the amount of S estimated to be released from the tailings by oxidation. Secondary precipitates such as covellite and gypsum, which can trap sulphur, were shown in earlier studies to be present in only low amounts. The annual release of elements from the tailings was estimated from the volume of tailings assumed to oxidise each year, which depends on movement of the oxidation front with time. The results indicate that the oxidation rate in the tailings has decreased over time, which may be due to the increased distance over which oxygen needs to diffuse to reach unoxidised sulphide grains, or their cores, in the tailings.

Ort, förlag, år, upplaga, sidor
2010. Vol. 408, nr 6, s. 1386-1302
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
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URN: urn:nbn:se:ltu:diva-5522DOI: 10.1016/j.scitotenv.2009.11.005ISI: 000274948000017PubMedID: 19939438Scopus ID: 2-s2.0-74449090590Lokalt ID: 3a5a6160-ddbe-11de-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-5522DiVA, id: diva2:978396
Anmärkning
Validerad; 2010; 20091130 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2019-11-22Bibliografiskt granskad

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Alakangas, LenaÖhlander, BjörnLundberg, Angela
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