Technological behaviour of some Tunisian clays prepared by dry ceramic processing
authors Jeridi, K; Hachani, M; Hajjaji, W; Moussi, B; Medhioub, M; Lopez-Galindo, A; Kooli, F; Zargouni, F; Labrincha, J; Jamoussi, F
nationality International
author keywords clays; Lower Cretaceous; Oligocene; dry process; ceramic tiles; Tunisia
abstract Lower Cretaceous (AJO and AJR) and Oligocene clays (AS) from northern Tunisia were analysed to evaluate their possible use in the production of earthenware tiles by dry processing and fast double-firing. The Cretaceous clays are carbonate-rich (AJO = 20%, AJR = 12%) while the Oligocene ones are carbonate-free. This led to noticeable difference,, in firing behaviour (shrinkage, sintering rate and loss on ignition and consequently in functional properties (water absorption, mechanical strength. porosity). The AJO firing shrinkage is very small. which makes this clav suitable for rapid firing. The clays are illite-kaolinite-rich but the AS sample is mostly smeetitic (44%) and so is used (10 wt.% maximum) only to adjust the consistency of the powder during pressing. The average agglomerate size ranges from 100 to 350 mu m and the distribution is suitable for easy pressing of powders without any special need for further adjustments. Characterization of fired products confirms the high potential of these clays since all properties fall within the ceramic International Standards (ISO). For both technical and economic reasons dry processing is recommended for production of earthenware tiles, in particular for countries in sunnier climates, where solar energy call be exploited for clay drying.
issn 0009-8558
year published 2008
volume 43
issue 3
beginning page 339
ending page 350
digital object identifier (doi) 10.1180/claymin.2008.043.3.01
web of science category Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy
subject category Chemistry; Geology; Mineralogy
unique article identifier WOS:000261154600001
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