Use of industrial wastes in the formulation of olivine green pigments
authors Esteves, D; Hajjaji, W; Seabra, MP; Labrincha, JA
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Ni-olivine; Green pigments; Galvanising waste; Foundry sand
keywords GALVANIC SLUDGE; SILICATE MELTS; CHROMIUM; SPECTRA; NICKEL; LIEBENBERGITE; GLASSES; IONS; RECOVERY; NI2SIO4
abstract This work describes the formulation and synthesis of Ni-olivine green pigments from industrial wastes, namely foundry sand and a sludge resulting from the wastewater treatment of the Ni/Cr galvanising process. This second one is considered as hazardous waste since the leached levels of nickel and chromium are above legal concentrations. Pigments were prepared by the solid state reaction method and Ni2SiO4 is formed at only 1050 degrees C. SiO2 (in excess) and NiCr2O4 are present as secondary phases. By using pure reagents and following similar processing conditions, the Ni-olivine phase is only observed at 1200 degrees C. The green colour of the pigments is due to spin-allowed transitions of Ni2+ in octahedral M1 and M2 positions. The sample prepared from wastes shows a stronger and darker green hue. The colouring performance of ceramic glazes and bodies is also optimal, confirming the potential of the use of such wastes for ceramic pigments production. (C) 2010 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2010
volume 30
issue 15
beginning page 3079
ending page 3085
digital object identifier (doi) 10.1016/j.jeurceramsoc.2010.07.006
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000282070200010
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journal analysis (jcr 2017):
journal impact factor 3.794
5 year journal impact factor 3.536
category normalized journal impact factor percentile 98.148
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