Assessment of the fluxing potential of igneous rocks in the traditional ceramics industry
authors Dias, FG; Segadaes, AM; Perottoni, CA; Cruz, RCD
nationality International
journal CERAMICS INTERNATIONAL
author keywords Igneous rocks; Hierarchical cluster analysis; Ceramic fluxes; Phase diagrams
keywords PORCELAIN STONEWARE TILES; NEPHELINE-SYENITE; PYROPLASTIC DEFORMATION; BODY; CLASSIFICATION; BEHAVIOR; BODIES; CLAYS; WASTE; LAVAS
abstract In this work, the fluxing characteristics of igneous rocks from the Serra Geral Formation (RS, Brazil) were assessed and compared with those of more common fluxes used in the ceramic industry. To this aim, 18 rock samples were characterized (XRF, XRD). Based on their chemical composition, samples were categorized (QAPF TAS diagrams) and grouped into five major rock types using a hierarchical cluster analysis (FICA). Representative rocks of each type were further characterized in terms of thermal behaviour (TGA-DSC and fusibility tests) and compared with similar characterization results available in the literature for other ceramic fluxes. Tests results showed very good agreement with HCA and the prediction's of the SiO2 Al2O3 CaO phase diagram. A synergistic effect was identified between alkali + alkali-earth oxides and iron oxide, suggesting that the fluxing potential can be estimated in terms of the alumina/fluxes weight ratio, resulting in a pleasant dark chocolate sheen of the fired pieces. Thus, the mineral resources identified in the Serra Geral Formation can indeed be used as fluxes and, as such, contribute to the cost-effective production of ceramic materials with higher added value.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2017
volume 43
issue 18
beginning page 16149
ending page 16158
digital object identifier (doi) 10.1016/j.ceramint.2017.08.190
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000414106600016
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journal impact factor 3.057
5 year journal impact factor 2.882
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