Synthesis of ceramic pigments from industrial wastes: Red mud and electroplating sludge
authors Carneiro, J; Tobaldi, DM; Capela, MN; Novais, RM; Seabra, MP; Labrincha, JA
nationality International
author keywords Bauxite residue; Electroplating sludge; Black pigment; Waste valorisation; Ceramic glaze
keywords CHROMIUM
abstract The perception of industrial waste has changed, in the last decades, from an economic and environmental problem to a potential raw material. In this work, the synthesis of a stable pigment was prepared by combining two hazardous and unexplored wastes: red mud (RM, rich in Fe) and electroplating sludge (ES, rich in Ni/Cr). The wastes were mixed in different proportions and calcined at 1200 degrees C. Black and brown pigments were obtained from the mixture of RM/ES in 1:3 and 1:1 wt proportions, respectively. The color was given by the chrome-iron-nickel spinels, based on Ni2+ T-3(1g)(F-3) transitions (approximate to 13,000 cm(-1)), Cr3+ (4)A(2g) -> T-4(1g)(F-4) transitions (approximate to 24,400 cm(-1)) and Fe3+ (approximate to 15,000-approximate to 122,500 cm(-1)). The achieved coloring strength and thermal stability on various ceramic glazes render excellent prospects for the industrial application of such waste-based pigments. (C) 2018 Elsevier Ltd. All rights reserved.
issn 0956-053X
year published 2018
volume 80
beginning page 371
ending page 378
digital object identifier (doi) 10.1016/j.wasman.2018.09.032
web of science category Engineering, Environmental; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000452946200038
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