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The release of arsenic from cyanidation tailings
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7291-8585
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7585-4017
2016 (English)In: Arsenic Research and Global Sustainability: Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016 / [ed] Bhattacharya, Prosun; Vahter, Marie; Jarsjo, Jerker; Kumpiene, Jurate; Charlotte, Sparrenbom, London: CRC Press, 2016, 201-202 p.Conference paper, Published paper (Refereed)
Abstract [en]

Tailings from a gold mine containing 1000 mg/kg of As were used to predict the release of As over an extended period of time. Post-cyanide mine processes were aiming to form arsenates and Fe-hydrates for effective As-immobilization. Speciation of the As in ore and tailings samples revealed that mining processes have dissolved the majority of the arsenopyrite in the ore, causing secondary As phases to co-precipitate with newly formed Fe-hydrates. Weathering Cell Tests (WCT) were conducted to assess the effect of weathering on the stability of As in the tailings. As-bearing Fe-hydrates remained intact during the early stages of the WCT. During later stages of the WCT, the release of As, Fe and S increased due to pyrrhotite oxidation and the destabilization of As-bearing Fe-hydrates. Low proportions of As was released in WCT, but additional pyrrhotite oxidation as pH falling to < 3 could further destabilize As-bearing Fe-hydrates

Place, publisher, year, edition, pages
London: CRC Press, 2016. 201-202 p.
Series
Arsenic in the environment., Proceedings
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-63073Scopus ID: 2-s2.0-85016963245ISBN: 9781315629438 (print)OAI: oai:DiVA.org:ltu-63073DiVA: diva2:1089259
Conference
6th International Congress on Arsenic in the Environment, AS 2016, Stockholm, 19-23 June 2016
Available from: 2017-04-19 Created: 2017-04-19 Last updated: 2017-11-24Bibliographically approved

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Hamberg, RogerAlakangas, LenaMaurice, Christian

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