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Green liquor dregs in mine waste remediation, from laboratory investigations to field application
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: 0000-0001-7585-4017
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7291-8585
2016 (Swedish)In: Mining Meets Wate: conflict and solutions IMWA 2016 in Leipzig, Germany, July 11-15, 2016 / [ed] Carsten Drebenstedt; Michael Paul, Freiberg: TU Bergakademie Freiberg, Institute of Mining and Special Civil Engineering , 2016, p. 706-713Conference paper, Published paper (Refereed)
Abstract [en]

The oxidation of sulphides in mine wastes is a possible threat to the environment as it has potential to generate acid rock drainage (ARD). A way to reduce ARD formation is to apply a soil cover to reduce oxygen fluxes and water infiltration to the underlying reactive wastes. A typical mine waste cover in Sweden consists of a compacted sealing layer of a fine grained till overlaid by an on-compacted protection layer. However, a fine grained till with low enough hydraulic conductivity (HC) can be difficult to find in the vicinity of the mine and it might be necessary to mix it with a fine grained material. In this study a mixture of till and a residue from pulp and paper production, Green Liquor Dregs (GLD) was studied in laboratory and in a pilot cell study. The objective of the laboratory study was to investigate if an addition of GLD will improve the HC of tills with different clay contents. The results show that HC of the different tills studied decreases with addition of 5-10 w.% of GLD, except from the clayey till that already had a low HC without addition of GLD. In the pilot scale study a cell was constructed to investigate the feasibility to compact a sealing layer of a fine grained till and 10 w. % of GLD. The pilot scale study shows that it can be difficult to reach a high compaction degree in the field. However, it does not necessarily mean that the HC of the sealing layer will increase. In fact the laboratory study shows the opposite trend, a decrease in HC with a decrease in dry density for tills with low clay content. The main conclusion of the study is that addition of GLD can be an alternative option to improve the properties of a local till that alone does not meet the requirements for HC.

Place, publisher, year, edition, pages
Freiberg: TU Bergakademie Freiberg, Institute of Mining and Special Civil Engineering , 2016. p. 706-713
Keyword [en]
Other technology - Environmental engineering, Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Mine closure, Acid Rock Drainage, Mine waste, Sealing layer, Green Liquor Dregs, Mine closure, Acid Rock Drainage, Mine waste, Sealing layer, Green Liquor Dregs, Övriga teknikvetenskaper - Miljöteknik, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geochemistry
Research subject
Applied Geology; Applied Geochemistry; Future mining (AERI)
Identifiers
URN: urn:nbn:se:ltu:diva-28549ISI: 000402663400111Local ID: 2601444b-a9a4-4f74-aa05-679679b511e8ISBN: 978-3-86012-533-5 (print)OAI: oai:DiVA.org:ltu-28549DiVA, id: diva2:1001749
Conference
International Mine Water Association Annual Conference 2016 : Mining meets Water - Conflicts and solutions 12/07/2016 - 15/07/2016
Projects
Användning av restprodukter för förhindrande sulfid oxidation i reaktivt gruvavfall- en förstudie
Note

Godkänd; 2016; 20160817 (sussir)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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http://www.imwa.info/docs/imwa_2016/IMWA2016_Siren_232.pdf

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