Low-valued raw materials challenge the common eligibility criteria for triaxial ceramics
authors Echeverrigaray, SG; Emiliano, JV; Segadaes, AM; Cruz, RCD
nationality International
journal CERAMICS INTERNATIONAL
author keywords Extruded clay bricks; Igneous rocks; Mineral wastes; Phase diagrams
keywords PHASE-DIAGRAMS; CLAY; PORCELAIN; PRODUCTS; REJECTS; WASTES; DESIGN; TILES
abstract In this work, two low-valued natural raw materials were used, namely a low plasticity and high iron content clay and a powdered rock waste generated during crushing of igneous rocks to produce construction aggregates. After characterization (chemical, mineralogical, thermal and granulometric), mixtures containing up to 75 wt% of rock powder were prepared and extruded closely following industrial practice, and fired for 60 min from 900 to 1100 degrees C. Property development was evaluated on as-extruded, dried and fired pieces. The results obtained were interpreted based on chemical compositions, the estimates from the Al2O3-SiO2-CaO phase diagram and presumed reaction kinetics. Such interpretation showed that physical characteristics dominate not only during shaping and drying, but also during low temperature firing (slow reaction kinetics), when rock additions act as inert material; at high firing temperatures, however, the rock promotes liquid phase development after first melting (fluxing effect) and thermodynamics prevail. The dominant fluxing effect results in improved fired properties, which were shown to depend almost linearly on the liquid phase content, predicted by the phase diagram and determined by the chemical composition. These results enabled the identification of behavioural composition ranges to best exploit the materials' industrial use potential and demonstrate that current paradigms in raw material evaluation and processing in traditional ceramics industries need a re-assessment. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2016
volume 42
issue 9
beginning page 10671
ending page 10681
digital object identifier (doi) 10.1016/j.ceramint.2016.03.178
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000376693800020
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journal impact factor 3.057
5 year journal impact factor 2.882
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