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Effects of the co-disposal of lignite fly ash and coal mine waste rocks on AMD and leachate quality
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Quaid-e-Awam University of Engineering, Science and Technology, Nawabshah, Pakistan.ORCID iD: 0000-0003-2810-8083
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.
Number of Authors: 32019 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 26, no 4, p. 4104-4115Article in journal (Refereed) Published
Abstract [en]

Lignite fly ash (FA) and waste rocks (WRs) were mixed in three different ratios (1:1, 1:3 and 1:5) and studied to compare the effects of adding FA on acid mine drainage generation from coal mining WRs, leachability of elements and the potential occurrence of the secondary minerals. FA mixed with WRs showed significant differences in pH levels compared to previous research. The 1:1 mixture performed best of all the three mixtures in terms of pH and leachability of elements, mainly due to the higher proportion of FA in the mixture. The pH in the 1:1 mixtures varied between 3.3 and 5.1 compared to other mixtures (2.3–3.5). Iron and SO42− leached considerably less from the 1:1 mixture compared to the others, indicating that the oxidation of sulphides was weaker in this mixture. Aluminium leached to a high degree from all mixtures, with concentrations varying from mg L−1 to g L−1. The reason behind this increase is probably the addition of FA which, due to acidic conditions and the composition of the FA, increases the availability of Al. For the same reason, high concentrations of Mn and Zn were also measured. Geochemical modelling indicates that the 1:1 mixture performs better in terms of precipitation of Al3+ minerals, whereas Fe3+ minerals precipitated more in mixtures containing less FA. These results suggest that, with time, the pores could possibly be filled with these secondary minerals and sulphate salts (followed by a decrease in sulphide oxidation), improving the pore water pH and decreasing the leachability of elements. Since grain size plays a crucial role in the reactivity of sulphides, there is a risk that the results from the leaching tests may have been influenced by crushing and milling of the WR samples.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 26, no 4, p. 4104-4115
Keywords [en]
Coal mine waste rock, acid mine drainage (AMD), fly ash mixing, weathering cells, PHREEQC, element leaching
National Category
Geochemistry Environmental Sciences Environmental Management Mineral and Mine Engineering
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-72667DOI: 10.1007/s11356-018-3896-8PubMedID: 30560529Scopus ID: 2-s2.0-85058775217OAI: oai:DiVA.org:ltu-72667DiVA, id: diva2:1282220
Note

Validerad;2019;Nivå 2;2019-02-12 (svasva)

Available from: 2019-01-24 Created: 2019-01-24 Last updated: 2019-02-12Bibliographically approved

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Qureshi, AsifMaurice, ChristianÖhlander, Björn

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