Cr-doped titanite pigment based on industrial rejects
authors Hajjaji, W; Zanelli, C; Seabra, MP; Dondi, M; Labrincha, JA
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Chromium doping; Titanite; Ceramic pigment; Marble sawing sludge; Galvanizing waste; Foundry sand
keywords MALAYAITE CERAMIC PIGMENTS; TECHNOLOGICAL PROPERTIES; OPTICAL SPECTROSCOPY; CRYSTAL-CHEMISTRY; OXIDATION-STATES; PHASE-TRANSITION; IONS; LUMINESCENCE; CASSITERITE; CATIOSIO4
abstract This work reports the development of inorganic pigments based on chromium doped titanite (CaTiSiO(5)). For economical and environmental reasons, wastes were used as raw materials but similar formulations from pure reagents were also prepared to assess the effect of impurities contained in wastes. Pigments were characterised by XRD, SEM + EDS microprobe analysis, and UV-vis-NIR spectroscopy. The colouring mechanism (the pigment is reddish brown) seems to result from the combined contribution of octahedral Cr(III) and tetrahedral Cr(IV)species replacing Ti(4+) and Si(4+), respectively. In both pure reagents and waste-based pigments, colorimetric parameters were evaluated and their colouring performance was tested in transparent and opaque ceramic glazes. Intense and stable brown hues were developed with optimized formulations, i.e. containing 0.044Cr at 1300 degrees C. (C) 2009 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2010
volume 158
issue 2
beginning page 167
ending page 172
digital object identifier (doi) 10.1016/j.cej.2009.12.026
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000276737400011
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