Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions
The purpose of this literature review is to summarize the recent research regarding geochemical and geotechnical stability of paste tailings, identify knowledge gaps and future research needs. The present study has been conducted by the Division of Geosciences and Environmental Engineering together...
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Luleå tekniska universitet, Geovetenskap och miljöteknik
2013
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ftluleatu:oai:DiVA.org:ltu-25066 2023-05-15T17:09:18+02:00 Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions Alakangas, Lena Dagli, Deniz Knutsson, Sven 2013 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25066 eng eng Luleå tekniska universitet, Geovetenskap och miljöteknik Luleå tekniska universitet, Geoteknologi Luleå orcid:0000-0001-7291-8505 orcid:0000-0002-1365-8552 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25066 Local da3b398f-0b0e-4c3b-b920-076d89fef9a9 info:eu-repo/semantics/openAccess paste tailings thickened tailings tailings geochemistry cold climate tailings properties tailings disposals Geotechnical Engineering Geoteknik Geochemistry Geokemi Report info:eu-repo/semantics/report text 2013 ftluleatu 2022-10-25T20:58:56Z The purpose of this literature review is to summarize the recent research regarding geochemical and geotechnical stability of paste tailings, identify knowledge gaps and future research needs. The present study has been conducted by the Division of Geosciences and Environmental Engineering together with the Division of Mining and Geotechnical Engineering at Luleå University of Technology on behalf of Boliden Mineral, LKAB and Outotec.A survey conducted by MEND (Mine Environment Neutral Drainage) in 2006 on the environmental effects related to the use of paste tailings summarizes that only a few studies had been performed about long-term effects on the surface and groundwater quality. Instead, the focus had been on the additives and the strength of the paste. It is still uncertain how the paste technology affects the long-term environmental stability from a geochemical point of view. Concerns regarding the stability of paste with high sulphide content are still relevant. Studies performed indicate that sulphide oxidation occurs within cemented paste as well as on the surface of non-cemented paste and cracks formed on the surfaces could induce oxidation. For cemented paste, metals released by sulphide oxidation might be sequestered due to high pH induced by the alkaline additives, but anion such as Se has been shown to be mobilized. The leachate has been shown to be near-neutral initially, but the neutrality decreases with time and probably metals sequestered in the matrix will also be released. Again, it should be noted that no long term study was performed on leaching of paste, cemented or uncemented. The longest leaching study was performed for one year. Arsenic has been proven to be retained in Ca-arsenates in cemented paste, but the long term stability of these precipitates is relatively unknown. Expanded secondary phases e.g. gypsum and ettringite have been observed to form when there is sulphate in the process or drainage of water. These phases could crack the paste, but, on the other hand, can also fill ... Report Luleå Luleå Luleå Luleå University of Technology Publications (DiVA) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
paste tailings thickened tailings tailings geochemistry cold climate tailings properties tailings disposals Geotechnical Engineering Geoteknik Geochemistry Geokemi |
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paste tailings thickened tailings tailings geochemistry cold climate tailings properties tailings disposals Geotechnical Engineering Geoteknik Geochemistry Geokemi Alakangas, Lena Dagli, Deniz Knutsson, Sven Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
topic_facet |
paste tailings thickened tailings tailings geochemistry cold climate tailings properties tailings disposals Geotechnical Engineering Geoteknik Geochemistry Geokemi |
description |
The purpose of this literature review is to summarize the recent research regarding geochemical and geotechnical stability of paste tailings, identify knowledge gaps and future research needs. The present study has been conducted by the Division of Geosciences and Environmental Engineering together with the Division of Mining and Geotechnical Engineering at Luleå University of Technology on behalf of Boliden Mineral, LKAB and Outotec.A survey conducted by MEND (Mine Environment Neutral Drainage) in 2006 on the environmental effects related to the use of paste tailings summarizes that only a few studies had been performed about long-term effects on the surface and groundwater quality. Instead, the focus had been on the additives and the strength of the paste. It is still uncertain how the paste technology affects the long-term environmental stability from a geochemical point of view. Concerns regarding the stability of paste with high sulphide content are still relevant. Studies performed indicate that sulphide oxidation occurs within cemented paste as well as on the surface of non-cemented paste and cracks formed on the surfaces could induce oxidation. For cemented paste, metals released by sulphide oxidation might be sequestered due to high pH induced by the alkaline additives, but anion such as Se has been shown to be mobilized. The leachate has been shown to be near-neutral initially, but the neutrality decreases with time and probably metals sequestered in the matrix will also be released. Again, it should be noted that no long term study was performed on leaching of paste, cemented or uncemented. The longest leaching study was performed for one year. Arsenic has been proven to be retained in Ca-arsenates in cemented paste, but the long term stability of these precipitates is relatively unknown. Expanded secondary phases e.g. gypsum and ettringite have been observed to form when there is sulphate in the process or drainage of water. These phases could crack the paste, but, on the other hand, can also fill ... |
format |
Report |
author |
Alakangas, Lena Dagli, Deniz Knutsson, Sven |
author_facet |
Alakangas, Lena Dagli, Deniz Knutsson, Sven |
author_sort |
Alakangas, Lena |
title |
Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
title_short |
Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
title_full |
Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
title_fullStr |
Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
title_full_unstemmed |
Literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
title_sort |
literature review on potential geochemical and geotechnical effects of adopting paste technology under cold climate conditions |
publisher |
Luleå tekniska universitet, Geovetenskap och miljöteknik |
publishDate |
2013 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25066 |
genre |
Luleå Luleå Luleå |
genre_facet |
Luleå Luleå Luleå |
op_relation |
orcid:0000-0001-7291-8505 orcid:0000-0002-1365-8552 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25066 Local da3b398f-0b0e-4c3b-b920-076d89fef9a9 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766065349341478912 |