Study of Zn-Pb ore tailings and their potential in cement technology
authors Nouairi, J; Hajjaji, W; Costa, CS; Senff, L; Patinha, C; da Silva, EF; Labrincha, JA; Rocha, F; Medhioub, M
nationality International
journal JOURNAL OF AFRICAN EARTH SCIENCES
author keywords Mining rejects; Diapiric zone; Clinker; Heavy metal; Immobilisation
keywords NORTHERN TUNISIA; MINE TAILINGS; SOILS; LEAD; METALS; ZINC
abstract This paper describes the synthesis of sulfobelite clinkers incorporating mining rejects. The targeted Zn-Pb tailing wastes generated in the diapiric zone (NW Tunisia) were tested in clinker/cement compositions to ensure the inertization of existing hazardous heavy metals. Mineralogical composition of the two selected samples revealed calcite, dolomite, quartz, kaolinite, galena, pyrite and gypsum as crystalline phases. Vertical distributions of dominant heavy metals (Pb, Zn and Cu) in soil profiles show enrichment in the surface layers and decrease towards the depth. In sintered clinkers powders, the presence of the targeted crystalline phases (trialuminate sulphate (C4A3S), belite (C2S), and ferrite (C4AF)) are in the predicted desirable amounts. Heat flow generated during the hydration of different cement pastes showed a slower reaction for clinkers with higher amounts of C(4)A(3)S or constituted by coarser particles. After 28 days curing, the best mechanical resistance (24.34 MPa under compression) was obtained for the clinker calcined at 1350 degrees C and showing a suitable particle size distribution. Concerning heavy metals, immobilisation of 75-85% of Pb, Zn and Cu was assessed in the mortars formulated with the produced clinker/cement, posing no hazardous risks to the environment. (C) 2017 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 1464-343X
year published 2018
volume 139
beginning page 165
ending page 172
digital object identifier (doi) 10.1016/j.jafrearsci.2017.11.004
web of science category Geosciences, Multidisciplinary
subject category Geology
unique article identifier WOS:000424724800011
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journal analysis (jcr 2017):
journal impact factor 1.532
5 year journal impact factor 1.784
category normalized journal impact factor percentile 36.053
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